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Diffstat (limited to '05/tcc-0.9.27/tccgen.c')
| -rw-r--r-- | 05/tcc-0.9.27/tccgen.c | 7388 |
1 files changed, 7388 insertions, 0 deletions
diff --git a/05/tcc-0.9.27/tccgen.c b/05/tcc-0.9.27/tccgen.c new file mode 100644 index 0000000..7f5d1e6 --- /dev/null +++ b/05/tcc-0.9.27/tccgen.c @@ -0,0 +1,7388 @@ +/* + * TCC - Tiny C Compiler + * + * Copyright (c) 2001-2004 Fabrice Bellard + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "tcc.h" + +/********************************************************/ +/* global variables */ +#define NODATA_WANTED (nocode_wanted > 0) /* no static data output wanted either */ +#define STATIC_DATA_WANTED (nocode_wanted & 0xC0000000) /* only static data output */ + +/* loc : local variable index + ind : output code index + rsym: return symbol + anon_sym: anonymous symbol index +*/ +static int local_scope; +static int in_sizeof; +static int section_sym; + +ST_DATA int vlas_in_scope; /* number of VLAs that are currently in scope */ +ST_DATA int vla_sp_root_loc; /* vla_sp_loc for SP before any VLAs were pushed */ +ST_DATA int vla_sp_loc; /* Pointer to variable holding location to store stack pointer on the stack when modifying stack pointer */ + +#if 0 +ST_DATA int rsym, anon_sym, ind, loc; +ST_DATA Sym *sym_free_first; +ST_DATA void **sym_pools; +ST_DATA int nb_sym_pools; + +ST_DATA Sym *global_stack; +ST_DATA Sym *local_stack; +ST_DATA Sym *define_stack; +ST_DATA Sym *global_label_stack; +ST_DATA Sym *local_label_stack; + +ST_DATA SValue __vstack[1+VSTACK_SIZE], *vtop, *pvtop; + +ST_DATA int const_wanted; /* true if constant wanted */ +ST_DATA int nocode_wanted; /* no code generation wanted */ +ST_DATA int global_expr; /* true if compound literals must be allocated globally (used during initializers parsing */ +ST_DATA CType func_vt; /* current function return type (used by return instruction) */ +ST_DATA int func_var; /* true if current function is variadic (used by return instruction) */ +ST_DATA int func_vc; +ST_DATA int last_line_num, last_ind, func_ind; /* debug last line number and pc */ +ST_DATA const char *funcname; +ST_DATA int g_debug; +ST_DATA CType char_pointer_type, func_old_type, int_type, size_type; +#endif +ST_DATA CType ptrdiff_type; + +ST_DATA struct switch_t { + struct case_t { + int64_t v1, v2; + int sym; + } **p; int n; /* list of case ranges */ + int def_sym; /* default symbol */ +} *cur_switch; /* current switch */ + +/* ------------------------------------------------------------------------- */ + +static void gen_cast(CType *type); +static void gen_cast_s(int t); +static inline CType *pointed_type(CType *type); +static int is_compatible_types(CType *type1, CType *type2); +static int parse_btype(CType *type, AttributeDef *ad); +static CType *type_decl(CType *type, AttributeDef *ad, int *v, int td); +static void parse_expr_type(CType *type); +static void init_putv(CType *type, Section *sec, unsigned long c); +static void decl_initializer(CType *type, Section *sec, unsigned long c, int first, int size_only); +static void block(int *bsym, int *csym, int is_expr); +static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r, int has_init, int v, int scope); +static void decl(int l); +static int decl0(int l, int is_for_loop_init, Sym *); +static void expr_eq(void); +static void vla_runtime_type_size(CType *type, int *a); +static void vla_sp_restore(void); +static void vla_sp_restore_root(void); +static int is_compatible_unqualified_types(CType *type1, CType *type2); +static inline int64_t expr_const64(void); +static void vpush64(int ty, unsigned long long v); +static void vpush(CType *type); +static int gvtst(int inv, int t); +static void gen_inline_functions(TCCState *s); +static void skip_or_save_block(TokenString **str); +static void gv_dup(void); + +ST_INLN int is_float(int t) +{ + int bt; + bt = t & VT_BTYPE; + return bt == VT_LDOUBLE || bt == VT_DOUBLE || bt == VT_FLOAT || bt == VT_QFLOAT; +} + +/* we use our own 'finite' function to avoid potential problems with + non standard math libs */ +/* XXX: endianness dependent */ +ST_FUNC int ieee_finite(double d) +{ + int p[4]; + memcpy(p, &d, sizeof(double)); + return ((unsigned)((p[1] | 0x800fffff) + 1)) >> 31; +} + +/* compiling intel long double natively */ +#if (defined __i386__ || defined __x86_64__) \ + && (defined TCC_TARGET_I386 || defined TCC_TARGET_X86_64) +# define TCC_IS_NATIVE_387 +#endif + +ST_FUNC void test_lvalue(void) +{ + if (!(vtop->r & VT_LVAL)) + expect("lvalue"); +} + +ST_FUNC void check_vstack(void) +{ + if (pvtop != vtop) + tcc_error("internal compiler error: vstack leak (%d)", vtop - pvtop); +} + +/* ------------------------------------------------------------------------- */ +/* vstack debugging aid */ + +#if 0 +void pv (const char *lbl, int a, int b) +{ + int i; + for (i = a; i < a + b; ++i) { + SValue *p = &vtop[-i]; + printf("%s vtop[-%d] : type.t:%04x r:%04x r2:%04x c.i:%d\n", + lbl, i, p->type.t, p->r, p->r2, (int)p->c.i); + } +} +#endif + +/* ------------------------------------------------------------------------- */ +/* start of translation unit info */ +ST_FUNC void tcc_debug_start(TCCState *s1) +{ + if (s1->do_debug) { + char buf[512]; + + /* file info: full path + filename */ + section_sym = put_elf_sym(symtab_section, 0, 0, + ELF64_ST_INFO(STB_LOCAL, STT_SECTION), 0, + text_section->sh_num, NULL); + getcwd(buf, sizeof(buf)); +#ifdef _WIN32 + normalize_slashes(buf); +#endif + pstrcat(buf, sizeof(buf), "/"); + put_stabs_r(buf, N_SO, 0, 0, + text_section->data_offset, text_section, section_sym); + put_stabs_r(file->filename, N_SO, 0, 0, + text_section->data_offset, text_section, section_sym); + last_ind = 0; + last_line_num = 0; + } + + /* an elf symbol of type STT_FILE must be put so that STB_LOCAL + symbols can be safely used */ + put_elf_sym(symtab_section, 0, 0, + ELF64_ST_INFO(STB_LOCAL, STT_FILE), 0, + SHN_ABS, file->filename); +} + +/* put end of translation unit info */ +ST_FUNC void tcc_debug_end(TCCState *s1) +{ + if (!s1->do_debug) + return; + put_stabs_r(NULL, N_SO, 0, 0, + text_section->data_offset, text_section, section_sym); + +} + +/* generate line number info */ +ST_FUNC void tcc_debug_line(TCCState *s1) +{ + if (!s1->do_debug) + return; + if ((last_line_num != file->line_num || last_ind != ind)) { + put_stabn(N_SLINE, 0, file->line_num, ind - func_ind); + last_ind = ind; + last_line_num = file->line_num; + } +} + +/* put function symbol */ +ST_FUNC void tcc_debug_funcstart(TCCState *s1, Sym *sym) +{ + char buf[512]; + + if (!s1->do_debug) + return; + + /* stabs info */ + /* XXX: we put here a dummy type */ + snprintf(buf, sizeof(buf), "%s:%c1", + funcname, sym->type.t & VT_STATIC ? 'f' : 'F'); + put_stabs_r(buf, N_FUN, 0, file->line_num, 0, + cur_text_section, sym->c); + /* //gr gdb wants a line at the function */ + put_stabn(N_SLINE, 0, file->line_num, 0); + + last_ind = 0; + last_line_num = 0; +} + +/* put function size */ +ST_FUNC void tcc_debug_funcend(TCCState *s1, int size) +{ + if (!s1->do_debug) + return; + put_stabn(N_FUN, 0, 0, size); +} + +/* ------------------------------------------------------------------------- */ +ST_FUNC int tccgen_compile(TCCState *s1) +{ + cur_text_section = NULL; + funcname = ""; + anon_sym = SYM_FIRST_ANOM; + section_sym = 0; + const_wanted = 0; + nocode_wanted = 0x80000000; + + /* define some often used types */ + int_type.t = VT_INT; + char_pointer_type.t = VT_BYTE; + mk_pointer(&char_pointer_type); +#if PTR_SIZE == 4 + size_type.t = VT_INT | VT_UNSIGNED; + ptrdiff_type.t = VT_INT; +#elif LONG_SIZE == 4 + size_type.t = VT_LLONG | VT_UNSIGNED; + ptrdiff_type.t = VT_LLONG; +#else + size_type.t = VT_LONG | VT_LLONG | VT_UNSIGNED; + ptrdiff_type.t = VT_LONG | VT_LLONG; +#endif + func_old_type.t = VT_FUNC; + func_old_type.ref = sym_push(SYM_FIELD, &int_type, 0, 0); + func_old_type.ref->f.func_call = FUNC_CDECL; + func_old_type.ref->f.func_type = FUNC_OLD; + + tcc_debug_start(s1); + +#ifdef TCC_TARGET_ARM + arm_init(s1); +#endif + +#ifdef INC_DEBUG + printf("%s: **** new file\n", file->filename); +#endif + + parse_flags = PARSE_FLAG_PREPROCESS | PARSE_FLAG_TOK_NUM | PARSE_FLAG_TOK_STR; + next(); + decl(VT_CONST); + gen_inline_functions(s1); + check_vstack(); + /* end of translation unit info */ + tcc_debug_end(s1); + return 0; +} + +/* ------------------------------------------------------------------------- */ +ST_FUNC ElfSym *elfsym(Sym *s) +{ + if (!s || !s->c) + return NULL; + return &((ElfSym *)symtab_section->data)[s->c]; +} + +/* apply storage attributes to Elf symbol */ +ST_FUNC void update_storage(Sym *sym) +{ + ElfSym *esym; + int sym_bind, old_sym_bind; + + esym = elfsym(sym); + if (!esym) + return; + + if (sym->a.visibility) + esym->st_other = (esym->st_other & ~ELF64_ST_VISIBILITY(-1)) + | sym->a.visibility; + + if (sym->type.t & VT_STATIC) + sym_bind = STB_LOCAL; + else if (sym->a.weak) + sym_bind = STB_WEAK; + else + sym_bind = STB_GLOBAL; + old_sym_bind = ELF64_ST_BIND(esym->st_info); + if (sym_bind != old_sym_bind) { + esym->st_info = ELF64_ST_INFO(sym_bind, ELF64_ST_TYPE(esym->st_info)); + } + +#ifdef TCC_TARGET_PE + if (sym->a.dllimport) + esym->st_other |= ST_PE_IMPORT; + if (sym->a.dllexport) + esym->st_other |= ST_PE_EXPORT; +#endif + +#if 0 + printf("storage %s: bind=%c vis=%d exp=%d imp=%d\n", + get_tok_str(sym->v, NULL), + sym_bind == STB_WEAK ? 'w' : sym_bind == STB_LOCAL ? 'l' : 'g', + sym->a.visibility, + sym->a.dllexport, + sym->a.dllimport + ); +#endif +} + +/* ------------------------------------------------------------------------- */ +/* update sym->c so that it points to an external symbol in section + 'section' with value 'value' */ + +ST_FUNC void put_extern_sym2(Sym *sym, int sh_num, + addr_t value, unsigned long size, + int can_add_underscore) +{ + int sym_type, sym_bind, info, other, t; + ElfSym *esym; + const char *name; + char buf1[256]; +#ifdef CONFIG_TCC_BCHECK + char buf[32]; +#endif + + if (!sym->c) { + name = get_tok_str(sym->v, NULL); +#ifdef CONFIG_TCC_BCHECK + if (tcc_state->do_bounds_check) { + /* XXX: avoid doing that for statics ? */ + /* if bound checking is activated, we change some function + names by adding the "__bound" prefix */ + switch(sym->v) { +#ifdef TCC_TARGET_PE + /* XXX: we rely only on malloc hooks */ + case TOK_malloc: + case TOK_free: + case TOK_realloc: + case TOK_memalign: + case TOK_calloc: +#endif + case TOK_memcpy: + case TOK_memmove: + case TOK_memset: + case TOK_strlen: + case TOK_strcpy: + case TOK_alloca: + strcpy(buf, "__bound_"); + strcat(buf, name); + name = buf; + break; + } + } +#endif + t = sym->type.t; + if ((t & VT_BTYPE) == VT_FUNC) { + sym_type = STT_FUNC; + } else if ((t & VT_BTYPE) == VT_VOID) { + sym_type = STT_NOTYPE; + } else { + sym_type = STT_OBJECT; + } + if (t & VT_STATIC) + sym_bind = STB_LOCAL; + else + sym_bind = STB_GLOBAL; + other = 0; +#ifdef TCC_TARGET_PE + if (sym_type == STT_FUNC && sym->type.ref) { + Sym *ref = sym->type.ref; + if (ref->f.func_call == FUNC_STDCALL && can_add_underscore) { + sprintf(buf1, "_%s@%d", name, ref->f.func_args * PTR_SIZE); + name = buf1; + other |= ST_PE_STDCALL; + can_add_underscore = 0; + } + } +#endif + if (tcc_state->leading_underscore && can_add_underscore) { + buf1[0] = '_'; + pstrcpy(buf1 + 1, sizeof(buf1) - 1, name); + name = buf1; + } + if (sym->asm_label) + name = get_tok_str(sym->asm_label, NULL); + info = ELF64_ST_INFO(sym_bind, sym_type); + sym->c = put_elf_sym(symtab_section, value, size, info, other, sh_num, name); + } else { + esym = elfsym(sym); + esym->st_value = value; + esym->st_size = size; + esym->st_shndx = sh_num; + } + update_storage(sym); +} + +ST_FUNC void put_extern_sym(Sym *sym, Section *section, + addr_t value, unsigned long size) +{ + int sh_num = section ? section->sh_num : SHN_UNDEF; + put_extern_sym2(sym, sh_num, value, size, 1); +} + +/* add a new relocation entry to symbol 'sym' in section 's' */ +ST_FUNC void greloca(Section *s, Sym *sym, unsigned long offset, int type, + addr_t addend) +{ + int c = 0; + + if (nocode_wanted && s == cur_text_section) + return; + + if (sym) { + if (0 == sym->c) + put_extern_sym(sym, NULL, 0, 0); + c = sym->c; + } + + /* now we can add ELF relocation info */ + put_elf_reloca(symtab_section, s, offset, type, c, addend); +} + +#if PTR_SIZE == 4 +ST_FUNC void greloc(Section *s, Sym *sym, unsigned long offset, int type) +{ + greloca(s, sym, offset, type, 0); +} +#endif + +/* ------------------------------------------------------------------------- */ +/* symbol allocator */ +static Sym *__sym_malloc(void) +{ + Sym *sym_pool, *sym, *last_sym; + int i; + + sym_pool = tcc_malloc(SYM_POOL_NB * sizeof(Sym)); + dynarray_add(&sym_pools, &nb_sym_pools, sym_pool); + + last_sym = sym_free_first; + sym = sym_pool; + for(i = 0; i < SYM_POOL_NB; i++) { + sym->next = last_sym; + last_sym = sym; + sym++; + } + sym_free_first = last_sym; + return last_sym; +} + +static inline Sym *sym_malloc(void) +{ + Sym *sym; +#ifndef SYM_DEBUG + sym = sym_free_first; + if (!sym) + sym = __sym_malloc(); + sym_free_first = sym->next; + return sym; +#else + sym = tcc_malloc(sizeof(Sym)); + return sym; +#endif +} + +ST_INLN void sym_free(Sym *sym) +{ +#ifndef SYM_DEBUG + sym->next = sym_free_first; + sym_free_first = sym; +#else + tcc_free(sym); +#endif +} + +/* push, without hashing */ +ST_FUNC Sym *sym_push2(Sym **ps, int v, int t, int c) +{ + Sym *s; + + s = sym_malloc(); + memset(s, 0, sizeof *s); + s->v = v; + s->type.t = t; + s->c = c; + /* add in stack */ + s->prev = *ps; + *ps = s; + return s; +} + +/* find a symbol and return its associated structure. 's' is the top + of the symbol stack */ +ST_FUNC Sym *sym_find2(Sym *s, int v) +{ + while (s) { + if (s->v == v) + return s; + else if (s->v == -1) + return NULL; + s = s->prev; + } + return NULL; +} + +/* structure lookup */ +ST_INLN Sym *struct_find(int v) +{ + v -= TOK_IDENT; + if ((unsigned)v >= (unsigned)(tok_ident - TOK_IDENT)) + return NULL; + return table_ident[v]->sym_struct; +} + +/* find an identifier */ +ST_INLN Sym *sym_find(int v) +{ + v -= TOK_IDENT; + if ((unsigned)v >= (unsigned)(tok_ident - TOK_IDENT)) + return NULL; + return table_ident[v]->sym_identifier; +} + +/* push a given symbol on the symbol stack */ +ST_FUNC Sym *sym_push(int v, CType *type, int r, int c) +{ + Sym *s, **ps; + TokenSym *ts; + + if (local_stack) + ps = &local_stack; + else + ps = &global_stack; + s = sym_push2(ps, v, type->t, c); + s->type.ref = type->ref; + s->r = r; + /* don't record fields or anonymous symbols */ + /* XXX: simplify */ + if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) { + /* record symbol in token array */ + ts = table_ident[(v & ~SYM_STRUCT) - TOK_IDENT]; + if (v & SYM_STRUCT) + ps = &ts->sym_struct; + else + ps = &ts->sym_identifier; + s->prev_tok = *ps; + *ps = s; + s->sym_scope = local_scope; + if (s->prev_tok && s->prev_tok->sym_scope == s->sym_scope) + tcc_error("redeclaration of '%s'", + get_tok_str(v & ~SYM_STRUCT, NULL)); + } + return s; +} + +/* push a global identifier */ +ST_FUNC Sym *global_identifier_push(int v, int t, int c) +{ + Sym *s, **ps; + s = sym_push2(&global_stack, v, t, c); + /* don't record anonymous symbol */ + if (v < SYM_FIRST_ANOM) { + ps = &table_ident[v - TOK_IDENT]->sym_identifier; + /* modify the top most local identifier, so that + sym_identifier will point to 's' when popped */ + while (*ps != NULL && (*ps)->sym_scope) + ps = &(*ps)->prev_tok; + s->prev_tok = *ps; + *ps = s; + } + return s; +} + +/* pop symbols until top reaches 'b'. If KEEP is non-zero don't really + pop them yet from the list, but do remove them from the token array. */ +ST_FUNC void sym_pop(Sym **ptop, Sym *b, int keep) +{ + Sym *s, *ss, **ps; + TokenSym *ts; + int v; + + s = *ptop; + while(s != b) { + ss = s->prev; + v = s->v; + /* remove symbol in token array */ + /* XXX: simplify */ + if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) { + ts = table_ident[(v & ~SYM_STRUCT) - TOK_IDENT]; + if (v & SYM_STRUCT) + ps = &ts->sym_struct; + else + ps = &ts->sym_identifier; + *ps = s->prev_tok; + } + if (!keep) + sym_free(s); + s = ss; + } + if (!keep) + *ptop = b; +} + +/* ------------------------------------------------------------------------- */ + +static void vsetc(CType *type, int r, CValue *vc) +{ + int v; + + if (vtop >= vstack + (VSTACK_SIZE - 1)) + tcc_error("memory full (vstack)"); + /* cannot let cpu flags if other instruction are generated. Also + avoid leaving VT_JMP anywhere except on the top of the stack + because it would complicate the code generator. + + Don't do this when nocode_wanted. vtop might come from + !nocode_wanted regions (see 88_codeopt.c) and transforming + it to a register without actually generating code is wrong + as their value might still be used for real. All values + we push under nocode_wanted will eventually be popped + again, so that the VT_CMP/VT_JMP value will be in vtop + when code is unsuppressed again. + + Same logic below in vswap(); */ + if (vtop >= vstack && !nocode_wanted) { + v = vtop->r & VT_VALMASK; + if (v == VT_CMP || (v & ~1) == VT_JMP) + gv(RC_INT); + } + + vtop++; + vtop->type = *type; + vtop->r = r; + vtop->r2 = VT_CONST; + vtop->c = *vc; + vtop->sym = NULL; +} + +ST_FUNC void vswap(void) +{ + SValue tmp; + /* cannot vswap cpu flags. See comment at vsetc() above */ + if (vtop >= vstack && !nocode_wanted) { + int v = vtop->r & VT_VALMASK; + if (v == VT_CMP || (v & ~1) == VT_JMP) + gv(RC_INT); + } + tmp = vtop[0]; + vtop[0] = vtop[-1]; + vtop[-1] = tmp; +} + +/* pop stack value */ +ST_FUNC void vpop(void) +{ + int v; + v = vtop->r & VT_VALMASK; +#if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64) + /* for x86, we need to pop the FP stack */ + if (v == TREG_ST0) { + o(0xd8dd); /* fstp %st(0) */ + } else +#endif + if (v == VT_JMP || v == VT_JMPI) { + /* need to put correct jump if && or || without test */ + gsym(vtop->c.i); + } + vtop--; +} + +/* push constant of type "type" with useless value */ +ST_FUNC void vpush(CType *type) +{ + vset(type, VT_CONST, 0); +} + +/* push integer constant */ +ST_FUNC void vpushi(int v) +{ + CValue cval; + cval.i = v; + vsetc(&int_type, VT_CONST, &cval); +} + +/* push a pointer sized constant */ +static void vpushs(addr_t v) +{ + CValue cval; + cval.i = v; + vsetc(&size_type, VT_CONST, &cval); +} + +/* push arbitrary 64bit constant */ +ST_FUNC void vpush64(int ty, unsigned long long v) +{ + CValue cval; + CType ctype; + ctype.t = ty; + ctype.ref = NULL; + cval.i = v; + vsetc(&ctype, VT_CONST, &cval); +} + +/* push long long constant */ +static inline void vpushll(long long v) +{ + vpush64(VT_LLONG, v); +} + +ST_FUNC void vset(CType *type, int r, int v) +{ + CValue cval; + + cval.i = v; + vsetc(type, r, &cval); +} + +static void vseti(int r, int v) +{ + CType type; + type.t = VT_INT; + type.ref = NULL; + vset(&type, r, v); +} + +ST_FUNC void vpushv(SValue *v) +{ + if (vtop >= vstack + (VSTACK_SIZE - 1)) + tcc_error("memory full (vstack)"); + vtop++; + *vtop = *v; +} + +static void vdup(void) +{ + vpushv(vtop); +} + +/* rotate n first stack elements to the bottom + I1 ... In -> I2 ... In I1 [top is right] +*/ +ST_FUNC void vrotb(int n) +{ + int i; + SValue tmp; + + tmp = vtop[-n + 1]; + for(i=-n+1;i!=0;i++) + vtop[i] = vtop[i+1]; + vtop[0] = tmp; +} + +/* rotate the n elements before entry e towards the top + I1 ... In ... -> In I1 ... I(n-1) ... [top is right] + */ +ST_FUNC void vrote(SValue *e, int n) +{ + int i; + SValue tmp; + + tmp = *e; + for(i = 0;i < n - 1; i++) + e[-i] = e[-i - 1]; + e[-n + 1] = tmp; +} + +/* rotate n first stack elements to the top + I1 ... In -> In I1 ... I(n-1) [top is right] + */ +ST_FUNC void vrott(int n) +{ + vrote(vtop, n); +} + +/* push a symbol value of TYPE */ +static inline void vpushsym(CType *type, Sym *sym) +{ + CValue cval; + cval.i = 0; + vsetc(type, VT_CONST | VT_SYM, &cval); + vtop->sym = sym; +} + +/* Return a static symbol pointing to a section */ +ST_FUNC Sym *get_sym_ref(CType *type, Section *sec, unsigned long offset, unsigned long size) +{ + int v; + Sym *sym; + + v = anon_sym++; + sym = global_identifier_push(v, type->t | VT_STATIC, 0); + sym->type.ref = type->ref; + sym->r = VT_CONST | VT_SYM; + put_extern_sym(sym, sec, offset, size); + return sym; +} + +/* push a reference to a section offset by adding a dummy symbol */ +static void vpush_ref(CType *type, Section *sec, unsigned long offset, unsigned long size) +{ + vpushsym(type, get_sym_ref(type, sec, offset, size)); +} + +/* define a new external reference to a symbol 'v' of type 'u' */ +ST_FUNC Sym *external_global_sym(int v, CType *type, int r) +{ + Sym *s; + + s = sym_find(v); + if (!s) { + /* push forward reference */ + s = global_identifier_push(v, type->t | VT_EXTERN, 0); + s->type.ref = type->ref; + s->r = r | VT_CONST | VT_SYM; + } else if (IS_ASM_SYM(s)) { + s->type.t = type->t | (s->type.t & VT_EXTERN); + s->type.ref = type->ref; + update_storage(s); + } + return s; +} + +/* Merge some type attributes. */ +static void patch_type(Sym *sym, CType *type) +{ + if (!(type->t & VT_EXTERN)) { + if (!(sym->type.t & VT_EXTERN)) + tcc_error("redefinition of '%s'", get_tok_str(sym->v, NULL)); + sym->type.t &= ~VT_EXTERN; + } + + if (IS_ASM_SYM(sym)) { + /* stay static if both are static */ + sym->type.t = type->t & (sym->type.t | ~VT_STATIC); + sym->type.ref = type->ref; + } + + if (!is_compatible_types(&sym->type, type)) { + tcc_error("incompatible types for redefinition of '%s'", + get_tok_str(sym->v, NULL)); + + } else if ((sym->type.t & VT_BTYPE) == VT_FUNC) { + int static_proto = sym->type.t & VT_STATIC; + /* warn if static follows non-static function declaration */ + if ((type->t & VT_STATIC) && !static_proto && !(type->t & VT_INLINE)) + tcc_warning("static storage ignored for redefinition of '%s'", + get_tok_str(sym->v, NULL)); + + if (0 == (type->t & VT_EXTERN)) { + /* put complete type, use static from prototype */ + sym->type.t = (type->t & ~VT_STATIC) | static_proto; + if (type->t & VT_INLINE) + sym->type.t = type->t; + sym->type.ref = type->ref; + } + + } else { + if ((sym->type.t & VT_ARRAY) && type->ref->c >= 0) { + /* set array size if it was omitted in extern declaration */ + if (sym->type.ref->c < 0) + sym->type.ref->c = type->ref->c; + else if (sym->type.ref->c != type->ref->c) + tcc_error("conflicting type for '%s'", get_tok_str(sym->v, NULL)); + } + if ((type->t ^ sym->type.t) & VT_STATIC) + tcc_warning("storage mismatch for redefinition of '%s'", + get_tok_str(sym->v, NULL)); + } +} + + +/* Merge some storage attributes. */ +static void patch_storage(Sym *sym, AttributeDef *ad, CType *type) +{ + if (type) + patch_type(sym, type); + +#ifdef TCC_TARGET_PE + if (sym->a.dllimport != ad->a.dllimport) + tcc_error("incompatible dll linkage for redefinition of '%s'", + get_tok_str(sym->v, NULL)); + sym->a.dllexport |= ad->a.dllexport; +#endif + sym->a.weak |= ad->a.weak; + if (ad->a.visibility) { + int vis = sym->a.visibility; + int vis2 = ad->a.visibility; + if (vis == STV_DEFAULT) + vis = vis2; + else if (vis2 != STV_DEFAULT) + vis = (vis < vis2) ? vis : vis2; + sym->a.visibility = vis; + } + if (ad->a.aligned) + sym->a.aligned = ad->a.aligned; + if (ad->asm_label) + sym->asm_label = ad->asm_label; + update_storage(sym); +} + +/* define a new external reference to a symbol 'v' */ +static Sym *external_sym(int v, CType *type, int r, AttributeDef *ad) +{ + Sym *s; + s = sym_find(v); + if (!s) { + /* push forward reference */ + s = sym_push(v, type, r | VT_CONST | VT_SYM, 0); + s->type.t |= VT_EXTERN; + s->a = ad->a; + s->sym_scope = 0; + } else { + if (s->type.ref == func_old_type.ref) { + s->type.ref = type->ref; + s->r = r | VT_CONST | VT_SYM; + s->type.t |= VT_EXTERN; + } + patch_storage(s, ad, type); + } + return s; +} + +/* push a reference to global symbol v */ +ST_FUNC void vpush_global_sym(CType *type, int v) +{ + vpushsym(type, external_global_sym(v, type, 0)); +} + +/* save registers up to (vtop - n) stack entry */ +ST_FUNC void save_regs(int n) +{ + SValue *p, *p1; + for(p = vstack, p1 = vtop - n; p <= p1; p++) + save_reg(p->r); +} + +/* save r to the memory stack, and mark it as being free */ +ST_FUNC void save_reg(int r) +{ + save_reg_upstack(r, 0); +} + +/* save r to the memory stack, and mark it as being free, + if seen up to (vtop - n) stack entry */ +ST_FUNC void save_reg_upstack(int r, int n) +{ + int l, saved, size, align; + SValue *p, *p1, sv; + CType *type; + + if ((r &= VT_VALMASK) >= VT_CONST) + return; + if (nocode_wanted) + return; + + /* modify all stack values */ + saved = 0; + l = 0; + for(p = vstack, p1 = vtop - n; p <= p1; p++) { + if ((p->r & VT_VALMASK) == r || + ((p->type.t & VT_BTYPE) == VT_LLONG && (p->r2 & VT_VALMASK) == r)) { + /* must save value on stack if not already done */ + if (!saved) { + /* NOTE: must reload 'r' because r might be equal to r2 */ + r = p->r & VT_VALMASK; + /* store register in the stack */ + type = &p->type; + if ((p->r & VT_LVAL) || + (!is_float(type->t) && (type->t & VT_BTYPE) != VT_LLONG)) +#if PTR_SIZE == 8 + type = &char_pointer_type; +#else + type = &int_type; +#endif + size = type_size(type, &align); + loc = (loc - size) & -align; + sv.type.t = type->t; + sv.r = VT_LOCAL | VT_LVAL; + sv.c.i = loc; + store(r, &sv); +#if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64) + /* x86 specific: need to pop fp register ST0 if saved */ + if (r == TREG_ST0) { + o(0xd8dd); /* fstp %st(0) */ + } +#endif +#if PTR_SIZE == 4 + /* special long long case */ + if ((type->t & VT_BTYPE) == VT_LLONG) { + sv.c.i += 4; + store(p->r2, &sv); + } +#endif + l = loc; + saved = 1; + } + /* mark that stack entry as being saved on the stack */ + if (p->r & VT_LVAL) { + /* also clear the bounded flag because the + relocation address of the function was stored in + p->c.i */ + p->r = (p->r & ~(VT_VALMASK | VT_BOUNDED)) | VT_LLOCAL; + } else { + p->r = lvalue_type(p->type.t) | VT_LOCAL; + } + p->r2 = VT_CONST; + p->c.i = l; + } + } +} + +#ifdef TCC_TARGET_ARM +/* find a register of class 'rc2' with at most one reference on stack. + * If none, call get_reg(rc) */ +ST_FUNC int get_reg_ex(int rc, int rc2) +{ + int r; + SValue *p; + + for(r=0;r<NB_REGS;r++) { + if (reg_classes[r] & rc2) { + int n; + n=0; + for(p = vstack; p <= vtop; p++) { + if ((p->r & VT_VALMASK) == r || + (p->r2 & VT_VALMASK) == r) + n++; + } + if (n <= 1) + return r; + } + } + return get_reg(rc); +} +#endif + +/* find a free register of class 'rc'. If none, save one register */ +ST_FUNC int get_reg(int rc) +{ + int r; + SValue *p; + + /* find a free register */ + for(r=0;r<NB_REGS;r++) { + if (reg_classes[r] & rc) { + if (nocode_wanted) + return r; + for(p=vstack;p<=vtop;p++) { + if ((p->r & VT_VALMASK) == r || + (p->r2 & VT_VALMASK) == r) + goto notfound; + } + return r; + } + notfound: ; + } + + /* no register left : free the first one on the stack (VERY + IMPORTANT to start from the bottom to ensure that we don't + spill registers used in gen_opi()) */ + for(p=vstack;p<=vtop;p++) { + /* look at second register (if long long) */ + r = p->r2 & VT_VALMASK; + if (r < VT_CONST && (reg_classes[r] & rc)) + goto save_found; + r = p->r & VT_VALMASK; + if (r < VT_CONST && (reg_classes[r] & rc)) { + save_found: + save_reg(r); + return r; + } + } + /* Should never comes here */ + return -1; +} + +/* move register 's' (of type 't') to 'r', and flush previous value of r to memory + if needed */ +static void move_reg(int r, int s, int t) +{ + SValue sv; + + if (r != s) { + save_reg(r); + sv.type.t = t; + sv.type.ref = NULL; + sv.r = s; + sv.c.i = 0; + load(r, &sv); + } +} + +/* get address of vtop (vtop MUST BE an lvalue) */ +ST_FUNC void gaddrof(void) +{ + vtop->r &= ~VT_LVAL; + /* tricky: if saved lvalue, then we can go back to lvalue */ + if ((vtop->r & VT_VALMASK) == VT_LLOCAL) + vtop->r = (vtop->r & ~(VT_VALMASK | VT_LVAL_TYPE)) | VT_LOCAL | VT_LVAL; + + +} + +#ifdef CONFIG_TCC_BCHECK +/* generate lvalue bound code */ +static void gbound(void) +{ + int lval_type; + CType type1; + + vtop->r &= ~VT_MUSTBOUND; + /* if lvalue, then use checking code before dereferencing */ + if (vtop->r & VT_LVAL) { + /* if not VT_BOUNDED value, then make one */ + if (!(vtop->r & VT_BOUNDED)) { + lval_type = vtop->r & (VT_LVAL_TYPE | VT_LVAL); + /* must save type because we must set it to int to get pointer */ + type1 = vtop->type; + vtop->type.t = VT_PTR; + gaddrof(); + vpushi(0); + gen_bounded_ptr_add(); + vtop->r |= lval_type; + vtop->type = type1; + } + /* then check for dereferencing */ + gen_bounded_ptr_deref(); + } +} +#endif + +static void incr_bf_adr(int o) +{ + vtop->type = char_pointer_type; + gaddrof(); + vpushi(o); + gen_op('+'); + vtop->type.t = (vtop->type.t & ~(VT_BTYPE|VT_DEFSIGN)) + | (VT_BYTE|VT_UNSIGNED); + vtop->r = (vtop->r & ~VT_LVAL_TYPE) + | (VT_LVAL_BYTE|VT_LVAL_UNSIGNED|VT_LVAL); +} + +/* single-byte load mode for packed or otherwise unaligned bitfields */ +static void load_packed_bf(CType *type, int bit_pos, int bit_size) +{ + int n, o, bits; + save_reg_upstack(vtop->r, 1); + vpush64(type->t & VT_BTYPE, 0); // B X + bits = 0, o = bit_pos >> 3, bit_pos &= 7; + do { + vswap(); // X B + incr_bf_adr(o); + vdup(); // X B B + n = 8 - bit_pos; + if (n > bit_size) + n = bit_size; + if (bit_pos) + vpushi(bit_pos), gen_op(TOK_SHR), bit_pos = 0; // X B Y + if (n < 8) + vpushi((1 << n) - 1), gen_op('&'); + gen_cast(type); + if (bits) + vpushi(bits), gen_op(TOK_SHL); + vrotb(3); // B Y X + gen_op('|'); // B X + bits += n, bit_size -= n, o = 1; + } while (bit_size); + vswap(), vpop(); + if (!(type->t & VT_UNSIGNED)) { + n = ((type->t & VT_BTYPE) == VT_LLONG ? 64 : 32) - bits; + vpushi(n), gen_op(TOK_SHL); + vpushi(n), gen_op(TOK_SAR); + } +} + +/* single-byte store mode for packed or otherwise unaligned bitfields */ +static void store_packed_bf(int bit_pos, int bit_size) +{ + int bits, n, o, m, c; + + c = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST; + vswap(); // X B + save_reg_upstack(vtop->r, 1); + bits = 0, o = bit_pos >> 3, bit_pos &= 7; + do { + incr_bf_adr(o); // X B + vswap(); //B X + c ? vdup() : gv_dup(); // B V X + vrott(3); // X B V + if (bits) + vpushi(bits), gen_op(TOK_SHR); + if (bit_pos) + vpushi(bit_pos), gen_op(TOK_SHL); + n = 8 - bit_pos; + if (n > bit_size) + n = bit_size; + if (n < 8) { + m = ((1 << n) - 1) << bit_pos; + vpushi(m), gen_op('&'); // X B V1 + vpushv(vtop-1); // X B V1 B + vpushi(m & 0x80 ? ~m & 0x7f : ~m); + gen_op('&'); // X B V1 B1 + gen_op('|'); // X B V2 + } + vdup(), vtop[-1] = vtop[-2]; // X B B V2 + vstore(), vpop(); // X B + bits += n, bit_size -= n, bit_pos = 0, o = 1; + } while (bit_size); + vpop(), vpop(); +} + +static int adjust_bf(SValue *sv, int bit_pos, int bit_size) +{ + int t; + if (0 == sv->type.ref) + return 0; + t = sv->type.ref->auxtype; + if (t != -1 && t != VT_STRUCT) { + sv->type.t = (sv->type.t & ~VT_BTYPE) | t; + sv->r = (sv->r & ~VT_LVAL_TYPE) | lvalue_type(sv->type.t); + } + return t; +} + +/* store vtop a register belonging to class 'rc'. lvalues are + converted to values. Cannot be used if cannot be converted to + register value (such as structures). */ +ST_FUNC int gv(int rc) +{ + int r, bit_pos, bit_size, size, align, rc2; + + /* NOTE: get_reg can modify vstack[] */ + if (vtop->type.t & VT_BITFIELD) { + CType type; + + bit_pos = BIT_POS(vtop->type.t); + bit_size = BIT_SIZE(vtop->type.t); + /* remove bit field info to avoid loops */ + vtop->type.t &= ~VT_STRUCT_MASK; + + type.ref = NULL; + type.t = vtop->type.t & VT_UNSIGNED; + if ((vtop->type.t & VT_BTYPE) == VT_BOOL) + type.t |= VT_UNSIGNED; + + r = adjust_bf(vtop, bit_pos, bit_size); + + if ((vtop->type.t & VT_BTYPE) == VT_LLONG) + type.t |= VT_LLONG; + else + type.t |= VT_INT; + + if (r == VT_STRUCT) { + load_packed_bf(&type, bit_pos, bit_size); + } else { + int bits = (type.t & VT_BTYPE) == VT_LLONG ? 64 : 32; + /* cast to int to propagate signedness in following ops */ + gen_cast(&type); + /* generate shifts */ + vpushi(bits - (bit_pos + bit_size)); + gen_op(TOK_SHL); + vpushi(bits - bit_size); + /* NOTE: transformed to SHR if unsigned */ + gen_op(TOK_SAR); + } + r = gv(rc); + } else { + if (is_float(vtop->type.t) && + (vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) { + unsigned long offset; + /* CPUs usually cannot use float constants, so we store them + generically in data segment */ + size = type_size(&vtop->type, &align); + if (NODATA_WANTED) + size = 0, align = 1; + offset = section_add(data_section, size, align); + vpush_ref(&vtop->type, data_section, offset, size); + vswap(); + init_putv(&vtop->type, data_section, offset); + vtop->r |= VT_LVAL; + } +#ifdef CONFIG_TCC_BCHECK + if (vtop->r & VT_MUSTBOUND) + gbound(); +#endif + + r = vtop->r & VT_VALMASK; + rc2 = (rc & RC_FLOAT) ? RC_FLOAT : RC_INT; +#ifndef TCC_TARGET_ARM64 + if (rc == RC_IRET) + rc2 = RC_LRET; +#ifdef TCC_TARGET_X86_64 + else if (rc == RC_FRET) + rc2 = RC_QRET; +#endif +#endif + /* need to reload if: + - constant + - lvalue (need to dereference pointer) + - already a register, but not in the right class */ + if (r >= VT_CONST + || (vtop->r & VT_LVAL) + || !(reg_classes[r] & rc) +#if PTR_SIZE == 8 + || ((vtop->type.t & VT_BTYPE) == VT_QLONG && !(reg_classes[vtop->r2] & rc2)) + || ((vtop->type.t & VT_BTYPE) == VT_QFLOAT && !(reg_classes[vtop->r2] & rc2)) +#else + || ((vtop->type.t & VT_BTYPE) == VT_LLONG && !(reg_classes[vtop->r2] & rc2)) +#endif + ) + { + r = get_reg(rc); +#if PTR_SIZE == 8 + if (((vtop->type.t & VT_BTYPE) == VT_QLONG) || ((vtop->type.t & VT_BTYPE) == VT_QFLOAT)) { + int addr_type = VT_LLONG, load_size = 8, load_type = ((vtop->type.t & VT_BTYPE) == VT_QLONG) ? VT_LLONG : VT_DOUBLE; +#else + if ((vtop->type.t & VT_BTYPE) == VT_LLONG) { + int addr_type = VT_INT, load_size = 4, load_type = VT_INT; + unsigned long long ll; +#endif + int r2, original_type; + original_type = vtop->type.t; + /* two register type load : expand to two words + temporarily */ +#if PTR_SIZE == 4 + if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) { + /* load constant */ + ll = vtop->c.i; + vtop->c.i = ll; /* first word */ + load(r, vtop); + vtop->r = r; /* save register value */ + vpushi(ll >> 32); /* second word */ + } else +#endif + if (vtop->r & VT_LVAL) { + /* We do not want to modifier the long long + pointer here, so the safest (and less + efficient) is to save all the other registers + in the stack. XXX: totally inefficient. */ + #if 0 + save_regs(1); + #else + /* lvalue_save: save only if used further down the stack */ + save_reg_upstack(vtop->r, 1); + #endif + /* load from memory */ + vtop->type.t = load_type; + load(r, vtop); + vdup(); + vtop[-1].r = r; /* save register value */ + /* increment pointer to get second word */ + vtop->type.t = addr_type; + gaddrof(); + vpushi(load_size); + gen_op('+'); + vtop->r |= VT_LVAL; + vtop->type.t = load_type; + } else { + /* move registers */ + load(r, vtop); + vdup(); + vtop[-1].r = r; /* save register value */ + vtop->r = vtop[-1].r2; + } + /* Allocate second register. Here we rely on the fact that + get_reg() tries first to free r2 of an SValue. */ + r2 = get_reg(rc2); + load(r2, vtop); + vpop(); + /* write second register */ + vtop->r2 = r2; + vtop->type.t = original_type; + } else if ((vtop->r & VT_LVAL) && !is_float(vtop->type.t)) { + int t1, t; + /* lvalue of scalar type : need to use lvalue type + because of possible cast */ + t = vtop->type.t; + t1 = t; + /* compute memory access type */ + if (vtop->r & VT_LVAL_BYTE) + t = VT_BYTE; + else if (vtop->r & VT_LVAL_SHORT) + t = VT_SHORT; + if (vtop->r & VT_LVAL_UNSIGNED) + t |= VT_UNSIGNED; + vtop->type.t = t; + load(r, vtop); + /* restore wanted type */ + vtop->type.t = t1; + } else { + /* one register type load */ + load(r, vtop); + } + } + vtop->r = r; +#ifdef TCC_TARGET_C67 + /* uses register pairs for doubles */ + if ((vtop->type.t & VT_BTYPE) == VT_DOUBLE) + vtop->r2 = r+1; +#endif + } + return r; +} + +/* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */ +ST_FUNC void gv2(int rc1, int rc2) +{ + int v; + + /* generate more generic register first. But VT_JMP or VT_CMP + values must be generated first in all cases to avoid possible + reload errors */ + v = vtop[0].r & VT_VALMASK; + if (v != VT_CMP && (v & ~1) != VT_JMP && rc1 <= rc2) { + vswap(); + gv(rc1); + vswap(); + gv(rc2); + /* test if reload is needed for first register */ + if ((vtop[-1].r & VT_VALMASK) >= VT_CONST) { + vswap(); + gv(rc1); + vswap(); + } + } else { + gv(rc2); + vswap(); + gv(rc1); + vswap(); + /* test if reload is needed for first register */ + if ((vtop[0].r & VT_VALMASK) >= VT_CONST) { + gv(rc2); + } + } +} + +#ifndef TCC_TARGET_ARM64 +/* wrapper around RC_FRET to return a register by type */ +static int rc_fret(int t) +{ +#ifdef TCC_TARGET_X86_64 + if (t == VT_LDOUBLE) { + return RC_ST0; + } +#endif + return RC_FRET; +} +#endif + +/* wrapper around REG_FRET to return a register by type */ +static int reg_fret(int t) +{ +#ifdef TCC_TARGET_X86_64 + if (t == VT_LDOUBLE) { + return TREG_ST0; + } +#endif + return REG_FRET; +} + +#if PTR_SIZE == 4 +/* expand 64bit on stack in two ints */ +static void lexpand(void) +{ + int u, v; + u = vtop->type.t & (VT_DEFSIGN | VT_UNSIGNED); + v = vtop->r & (VT_VALMASK | VT_LVAL); + if (v == VT_CONST) { + vdup(); + vtop[0].c.i >>= 32; + } else if (v == (VT_LVAL|VT_CONST) || v == (VT_LVAL|VT_LOCAL)) { + vdup(); + vtop[0].c.i += 4; + } else { + gv(RC_INT); + vdup(); + vtop[0].r = vtop[-1].r2; + vtop[0].r2 = vtop[-1].r2 = VT_CONST; + } + vtop[0].type.t = vtop[-1].type.t = VT_INT | u; +} +#endif + +#ifdef TCC_TARGET_ARM +/* expand long long on stack */ +ST_FUNC void lexpand_nr(void) +{ + int u,v; + + u = vtop->type.t & (VT_DEFSIGN | VT_UNSIGNED); + vdup(); + vtop->r2 = VT_CONST; + vtop->type.t = VT_INT | u; + v=vtop[-1].r & (VT_VALMASK | VT_LVAL); + if (v == VT_CONST) { + vtop[-1].c.i = vtop->c.i; + vtop->c.i = vtop->c.i >> 32; + vtop->r = VT_CONST; + } else if (v == (VT_LVAL|VT_CONST) || v == (VT_LVAL|VT_LOCAL)) { + vtop->c.i += 4; + vtop->r = vtop[-1].r; + } else if (v > VT_CONST) { + vtop--; + lexpand(); + } else + vtop->r = vtop[-1].r2; + vtop[-1].r2 = VT_CONST; + vtop[-1].type.t = VT_INT | u; +} +#endif + +#if PTR_SIZE == 4 +/* build a long long from two ints */ +static void lbuild(int t) +{ + gv2(RC_INT, RC_INT); + vtop[-1].r2 = vtop[0].r; + vtop[-1].type.t = t; + vpop(); +} +#endif + +/* convert stack entry to register and duplicate its value in another + register */ +static void gv_dup(void) +{ + int rc, t, r, r1; + SValue sv; + + t = vtop->type.t; +#if PTR_SIZE == 4 + if ((t & VT_BTYPE) == VT_LLONG) { + if (t & VT_BITFIELD) { + gv(RC_INT); + t = vtop->type.t; + } + lexpand(); + gv_dup(); + vswap(); + vrotb(3); + gv_dup(); + vrotb(4); + /* stack: H L L1 H1 */ + lbuild(t); + vrotb(3); + vrotb(3); + vswap(); + lbuild(t); + vswap(); + } else +#endif + { + /* duplicate value */ + rc = RC_INT; + sv.type.t = VT_INT; + if (is_float(t)) { + rc = RC_FLOAT; +#ifdef TCC_TARGET_X86_64 + if ((t & VT_BTYPE) == VT_LDOUBLE) { + rc = RC_ST0; + } +#endif + sv.type.t = t; + } + r = gv(rc); + r1 = get_reg(rc); + sv.r = r; + sv.c.i = 0; + load(r1, &sv); /* move r to r1 */ + vdup(); + /* duplicates value */ + if (r != r1) + vtop->r = r1; + } +} + +/* Generate value test + * + * Generate a test for any value (jump, comparison and integers) */ +ST_FUNC int gvtst(int inv, int t) +{ + int v = vtop->r & VT_VALMASK; + if (v != VT_CMP && v != VT_JMP && v != VT_JMPI) { + vpushi(0); + gen_op(TOK_NE); + } + if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) { + /* constant jmp optimization */ + if ((vtop->c.i != 0) != inv) + t = gjmp(t); + vtop--; + return t; + } + return gtst(inv, t); +} + +#if PTR_SIZE == 4 +/* generate CPU independent (unsigned) long long operations */ +static void gen_opl(int op) +{ + int t, a, b, op1, c, i; + int func; + unsigned short reg_iret = REG_IRET; + unsigned short reg_lret = REG_LRET; + SValue tmp; + + switch(op) { + case '/': + case TOK_PDIV: + func = TOK___divdi3; + goto gen_func; + case TOK_UDIV: + func = TOK___udivdi3; + goto gen_func; + case '%': + func = TOK___moddi3; + goto gen_mod_func; + case TOK_UMOD: + func = TOK___umoddi3; + gen_mod_func: +#ifdef TCC_ARM_EABI + reg_iret = TREG_R2; + reg_lret = TREG_R3; +#endif + gen_func: + /* call generic long long function */ + vpush_global_sym(&func_old_type, func); + vrott(3); + gfunc_call(2); + vpushi(0); + vtop->r = reg_iret; + vtop->r2 = reg_lret; + break; + case '^': + case '&': + case '|': + case '*': + case '+': + case '-': + //pv("gen_opl A",0,2); + t = vtop->type.t; + vswap(); + lexpand(); + vrotb(3); + lexpand(); + /* stack: L1 H1 L2 H2 */ + tmp = vtop[0]; + vtop[0] = vtop[-3]; + vtop[-3] = tmp; + tmp = vtop[-2]; + vtop[-2] = vtop[-3]; + vtop[-3] = tmp; + vswap(); + /* stack: H1 H2 L1 L2 */ + //pv("gen_opl B",0,4); + if (op == '*') { + vpushv(vtop - 1); + vpushv(vtop - 1); + gen_op(TOK_UMULL); + lexpand(); + /* stack: H1 H2 L1 L2 ML MH */ + for(i=0;i<4;i++) + vrotb(6); + /* stack: ML MH H1 H2 L1 L2 */ + tmp = vtop[0]; + vtop[0] = vtop[-2]; + vtop[-2] = tmp; + /* stack: ML MH H1 L2 H2 L1 */ + gen_op('*'); + vrotb(3); + vrotb(3); + gen_op('*'); + /* stack: ML MH M1 M2 */ + gen_op('+'); + gen_op('+'); + } else if (op == '+' || op == '-') { + /* XXX: add non carry method too (for MIPS or alpha) */ + if (op == '+') + op1 = TOK_ADDC1; + else + op1 = TOK_SUBC1; + gen_op(op1); + /* stack: H1 H2 (L1 op L2) */ + vrotb(3); + vrotb(3); + gen_op(op1 + 1); /* TOK_xxxC2 */ + } else { + gen_op(op); + /* stack: H1 H2 (L1 op L2) */ + vrotb(3); + vrotb(3); + /* stack: (L1 op L2) H1 H2 */ + gen_op(op); + /* stack: (L1 op L2) (H1 op H2) */ + } + /* stack: L H */ + lbuild(t); + break; + case TOK_SAR: + case TOK_SHR: + case TOK_SHL: + if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) { + t = vtop[-1].type.t; + vswap(); + lexpand(); + vrotb(3); + /* stack: L H shift */ + c = (int)vtop->c.i; + /* constant: simpler */ + /* NOTE: all comments are for SHL. the other cases are + done by swapping words */ + vpop(); + if (op != TOK_SHL) + vswap(); + if (c >= 32) { + /* stack: L H */ + vpop(); + if (c > 32) { + vpushi(c - 32); + gen_op(op); + } + if (op != TOK_SAR) { + vpushi(0); + } else { + gv_dup(); + vpushi(31); + gen_op(TOK_SAR); + } + vswap(); + } else { + vswap(); + gv_dup(); + /* stack: H L L */ + vpushi(c); + gen_op(op); + vswap(); + vpushi(32 - c); + if (op == TOK_SHL) + gen_op(TOK_SHR); + else + gen_op(TOK_SHL); + vrotb(3); + /* stack: L L H */ + vpushi(c); + if (op == TOK_SHL) + gen_op(TOK_SHL); + else + gen_op(TOK_SHR); + gen_op('|'); + } + if (op != TOK_SHL) + vswap(); + lbuild(t); + } else { + /* XXX: should provide a faster fallback on x86 ? */ + switch(op) { + case TOK_SAR: + func = TOK___ashrdi3; + goto gen_func; + case TOK_SHR: + func = TOK___lshrdi3; + goto gen_func; + case TOK_SHL: + func = TOK___ashldi3; + goto gen_func; + } + } + break; + default: + /* compare operations */ + t = vtop->type.t; + vswap(); + lexpand(); + vrotb(3); + lexpand(); + /* stack: L1 H1 L2 H2 */ + tmp = vtop[-1]; + vtop[-1] = vtop[-2]; + vtop[-2] = tmp; + /* stack: L1 L2 H1 H2 */ + /* compare high */ + op1 = op; + /* when values are equal, we need to compare low words. since + the jump is inverted, we invert the test too. */ + if (op1 == TOK_LT) + op1 = TOK_LE; + else if (op1 == TOK_GT) + op1 = TOK_GE; + else if (op1 == TOK_ULT) + op1 = TOK_ULE; + else if (op1 == TOK_UGT) + op1 = TOK_UGE; + a = 0; + b = 0; + gen_op(op1); + if (op == TOK_NE) { + b = gvtst(0, 0); + } else { + a = gvtst(1, 0); + if (op != TOK_EQ) { + /* generate non equal test */ + vpushi(TOK_NE); + vtop->r = VT_CMP; + b = gvtst(0, 0); + } + } + /* compare low. Always unsigned */ + op1 = op; + if (op1 == TOK_LT) + op1 = TOK_ULT; + else if (op1 == TOK_LE) + op1 = TOK_ULE; + else if (op1 == TOK_GT) + op1 = TOK_UGT; + else if (op1 == TOK_GE) + op1 = TOK_UGE; + gen_op(op1); + a = gvtst(1, a); + gsym(b); + vseti(VT_JMPI, a); + break; + } +} +#endif + +static uint64_t gen_opic_sdiv(uint64_t a, uint64_t b) +{ + uint64_t x = (a >> 63 ? -a : a) / (b >> 63 ? -b : b); + return (a ^ b) >> 63 ? -x : x; +} + +static int gen_opic_lt(uint64_t a, uint64_t b) +{ + return (a ^ (uint64_t)1 << 63) < (b ^ (uint64_t)1 << 63); +} + +/* handle integer constant optimizations and various machine + independent opt */ +static void gen_opic(int op) +{ + SValue *v1 = vtop - 1; + SValue *v2 = vtop; + int t1 = v1->type.t & VT_BTYPE; + int t2 = v2->type.t & VT_BTYPE; + int c1 = (v1->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST; + int c2 = (v2->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST; + uint64_t l1 = c1 ? v1->c.i : 0; + uint64_t l2 = c2 ? v2->c.i : 0; + int shm = (t1 == VT_LLONG) ? 63 : 31; + + if (t1 != VT_LLONG && (PTR_SIZE != 8 || t1 != VT_PTR)) + l1 = ((uint32_t)l1 | + (v1->type.t & VT_UNSIGNED ? 0 : -(l1 & 0x80000000))); + if (t2 != VT_LLONG && (PTR_SIZE != 8 || t2 != VT_PTR)) + l2 = ((uint32_t)l2 | + (v2->type.t & VT_UNSIGNED ? 0 : -(l2 & 0x80000000))); + + if (c1 && c2) { + switch(op) { + case '+': l1 += l2; break; + case '-': l1 -= l2; break; + case '&': l1 &= l2; break; + case '^': l1 ^= l2; break; + case '|': l1 |= l2; break; + case '*': l1 *= l2; break; + + case TOK_PDIV: + case '/': + case '%': + case TOK_UDIV: + case TOK_UMOD: + /* if division by zero, generate explicit division */ + if (l2 == 0) { + if (const_wanted) + tcc_error("division by zero in constant"); + goto general_case; + } + switch(op) { + case '%': l1 = l1 - l2 * gen_opic_sdiv(l1, l2); break; + case TOK_UDIV: l1 = l1 / l2; break; + case TOK_UMOD: l1 = l1 % l2; break; + default: l1 = gen_opic_sdiv(l1, l2); break; + } + break; + case TOK_SHL: l1 <<= (l2 & shm); break; + case TOK_SHR: l1 >>= (l2 & shm); break; + case TOK_SAR: + l1 = (l1 >> 63) ? ~(~l1 >> (l2 & shm)) : l1 >> (l2 & shm); + break; + /* tests */ + case TOK_ULT: l1 = l1 < l2; break; + case TOK_UGE: l1 = l1 >= l2; break; + case TOK_EQ: l1 = l1 == l2; break; + case TOK_NE: l1 = l1 != l2; break; + case TOK_ULE: l1 = l1 <= l2; break; + case TOK_UGT: l1 = l1 > l2; break; + case TOK_LT: l1 = gen_opic_lt(l1, l2); break; + case TOK_GE: l1 = !gen_opic_lt(l1, l2); break; + case TOK_LE: l1 = !gen_opic_lt(l2, l1); break; + case TOK_GT: l1 = gen_opic_lt(l2, l1); break; + /* logical */ + case TOK_LAND: l1 = l1 && l2; break; + case TOK_LOR: l1 = l1 || l2; break; + default: + goto general_case; + } + if (t1 != VT_LLONG && (PTR_SIZE != 8 || t1 != VT_PTR)) + l1 = ((uint32_t)l1 | + (v1->type.t & VT_UNSIGNED ? 0 : -(l1 & 0x80000000))); + v1->c.i = l1; + vtop--; + } else { + /* if commutative ops, put c2 as constant */ + if (c1 && (op == '+' || op == '&' || op == '^' || + op == '|' || op == '*')) { + vswap(); + c2 = c1; //c = c1, c1 = c2, c2 = c; + l2 = l1; //l = l1, l1 = l2, l2 = l; + } + if (!const_wanted && + c1 && ((l1 == 0 && + (op == TOK_SHL || op == TOK_SHR || op == TOK_SAR)) || + (l1 == -1 && op == TOK_SAR))) { + /* treat (0 << x), (0 >> x) and (-1 >> x) as constant */ + vtop--; + } else if (!const_wanted && + c2 && ((l2 == 0 && (op == '&' || op == '*')) || + (op == '|' && + (l2 == -1 || (l2 == 0xFFFFFFFF && t2 != VT_LLONG))) || + (l2 == 1 && (op == '%' || op == TOK_UMOD)))) { + /* treat (x & 0), (x * 0), (x | -1) and (x % 1) as constant */ + if (l2 == 1) + vtop->c.i = 0; + vswap(); + vtop--; + } else if (c2 && (((op == '*' || op == '/' || op == TOK_UDIV || + op == TOK_PDIV) && + l2 == 1) || + ((op == '+' || op == '-' || op == '|' || op == '^' || + op == TOK_SHL || op == TOK_SHR || op == TOK_SAR) && + l2 == 0) || + (op == '&' && + (l2 == -1 || (l2 == 0xFFFFFFFF && t2 != VT_LLONG))))) { + /* filter out NOP operations like x*1, x-0, x&-1... */ + vtop--; + } else if (c2 && (op == '*' || op == TOK_PDIV || op == TOK_UDIV)) { + /* try to use shifts instead of muls or divs */ + if (l2 > 0 && (l2 & (l2 - 1)) == 0) { + int n = -1; + while (l2) { + l2 >>= 1; + n++; + } + vtop->c.i = n; + if (op == '*') + op = TOK_SHL; + else if (op == TOK_PDIV) + op = TOK_SAR; + else + op = TOK_SHR; + } + goto general_case; + } else if (c2 && (op == '+' || op == '-') && + (((vtop[-1].r & (VT_VALMASK | VT_LVAL | VT_SYM)) == (VT_CONST | VT_SYM)) + || (vtop[-1].r & (VT_VALMASK | VT_LVAL)) == VT_LOCAL)) { + /* symbol + constant case */ + if (op == '-') + l2 = -l2; + l2 += vtop[-1].c.i; + /* The backends can't always deal with addends to symbols + larger than +-1<<31. Don't construct such. */ + if ((int)l2 != l2) + goto general_case; + vtop--; + vtop->c.i = l2; + } else { + general_case: + /* call low level op generator */ + if (t1 == VT_LLONG || t2 == VT_LLONG || + (PTR_SIZE == 8 && (t1 == VT_PTR || t2 == VT_PTR))) + gen_opl(op); + else + gen_opi(op); + } + } +} + +/* generate a floating point operation with constant propagation */ +static void gen_opif(int op) +{ + int c1, c2; + SValue *v1, *v2; +#if defined _MSC_VER && defined _AMD64_ + /* avoid bad optimization with f1 -= f2 for f1:-0.0, f2:0.0 */ + volatile +#endif + long double f1, f2; + + v1 = vtop - 1; + v2 = vtop; + /* currently, we cannot do computations with forward symbols */ + c1 = (v1->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST; + c2 = (v2->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST; + if (c1 && c2) { + if (v1->type.t == VT_FLOAT) { + f1 = v1->c.f; + f2 = v2->c.f; + } else if (v1->type.t == VT_DOUBLE) { + f1 = v1->c.d; + f2 = v2->c.d; + } else { + f1 = v1->c.ld; + f2 = v2->c.ld; + } + + /* NOTE: we only do constant propagation if finite number (not + NaN or infinity) (ANSI spec) */ + if (!ieee_finite(f1) || !ieee_finite(f2)) + goto general_case; + + switch(op) { + case '+': f1 += f2; break; + case '-': f1 -= f2; break; + case '*': f1 *= f2; break; + case '/': + if (f2 == 0.0) { + if (const_wanted) + tcc_error("division by zero in constant"); + goto general_case; + } + f1 /= f2; + break; + /* XXX: also handles tests ? */ + default: + goto general_case; + } + /* XXX: overflow test ? */ + if (v1->type.t == VT_FLOAT) { + v1->c.f = f1; + } else if (v1->type.t == VT_DOUBLE) { + v1->c.d = f1; + } else { + v1->c.ld = f1; + } + vtop--; + } else { + general_case: + gen_opf(op); + } +} + +static int pointed_size(CType *type) +{ + int align; + return type_size(pointed_type(type), &align); +} + +static void vla_runtime_pointed_size(CType *type) +{ + int align; + vla_runtime_type_size(pointed_type(type), &align); +} + +static inline int is_null_pointer(SValue *p) +{ + if ((p->r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST) + return 0; + return ((p->type.t & VT_BTYPE) == VT_INT && (uint32_t)p->c.i == 0) || + ((p->type.t & VT_BTYPE) == VT_LLONG && p->c.i == 0) || + ((p->type.t & VT_BTYPE) == VT_PTR && + (PTR_SIZE == 4 ? (uint32_t)p->c.i == 0 : p->c.i == 0)); +} + +static inline int is_integer_btype(int bt) +{ + return (bt == VT_BYTE || bt == VT_SHORT || + bt == VT_INT || bt == VT_LLONG); +} + +/* check types for comparison or subtraction of pointers */ +static void check_comparison_pointer_types(SValue *p1, SValue *p2, int op) +{ + CType *type1, *type2, tmp_type1, tmp_type2; + int bt1, bt2; + + /* null pointers are accepted for all comparisons as gcc */ + if (is_null_pointer(p1) || is_null_pointer(p2)) + return; + type1 = &p1->type; + type2 = &p2->type; + bt1 = type1->t & VT_BTYPE; + bt2 = type2->t & VT_BTYPE; + /* accept comparison between pointer and integer with a warning */ + if ((is_integer_btype(bt1) || is_integer_btype(bt2)) && op != '-') { + if (op != TOK_LOR && op != TOK_LAND ) + tcc_warning("comparison between pointer and integer"); + return; + } + + /* both must be pointers or implicit function pointers */ + if (bt1 == VT_PTR) { + type1 = pointed_type(type1); + } else if (bt1 != VT_FUNC) + goto invalid_operands; + + if (bt2 == VT_PTR) { + type2 = pointed_type(type2); + } else if (bt2 != VT_FUNC) { + invalid_operands: + tcc_error("invalid operands to binary %s", get_tok_str(op, NULL)); + } + if ((type1->t & VT_BTYPE) == VT_VOID || + (type2->t & VT_BTYPE) == VT_VOID) + return; + tmp_type1 = *type1; + tmp_type2 = *type2; + tmp_type1.t &= ~(VT_DEFSIGN | VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE); + tmp_type2.t &= ~(VT_DEFSIGN | VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE); + if (!is_compatible_types(&tmp_type1, &tmp_type2)) { + /* gcc-like error if '-' is used */ + if (op == '-') + goto invalid_operands; + else + tcc_warning("comparison of distinct pointer types lacks a cast"); + } +} + +/* generic gen_op: handles types problems */ +ST_FUNC void gen_op(int op) +{ + int u, t1, t2, bt1, bt2, t; + CType type1; + +redo: + t1 = vtop[-1].type.t; + t2 = vtop[0].type.t; + bt1 = t1 & VT_BTYPE; + bt2 = t2 & VT_BTYPE; + + if (bt1 == VT_STRUCT || bt2 == VT_STRUCT) { + tcc_error("operation on a struct"); + } else if (bt1 == VT_FUNC || bt2 == VT_FUNC) { + if (bt2 == VT_FUNC) { + mk_pointer(&vtop->type); + gaddrof(); + } + if (bt1 == VT_FUNC) { + vswap(); + mk_pointer(&vtop->type); + gaddrof(); + vswap(); + } + goto redo; + } else if (bt1 == VT_PTR || bt2 == VT_PTR) { + /* at least one operand is a pointer */ + /* relational op: must be both pointers */ + if (op >= TOK_ULT && op <= TOK_LOR) { + check_comparison_pointer_types(vtop - 1, vtop, op); + /* pointers are handled are unsigned */ +#if PTR_SIZE == 8 + t = VT_LLONG | VT_UNSIGNED; +#else + t = VT_INT | VT_UNSIGNED; +#endif + goto std_op; + } + /* if both pointers, then it must be the '-' op */ + if (bt1 == VT_PTR && bt2 == VT_PTR) { + if (op != '-') + tcc_error("cannot use pointers here"); + check_comparison_pointer_types(vtop - 1, vtop, op); + /* XXX: check that types are compatible */ + if (vtop[-1].type.t & VT_VLA) { + vla_runtime_pointed_size(&vtop[-1].type); + } else { + vpushi(pointed_size(&vtop[-1].type)); + } + vrott(3); + gen_opic(op); + vtop->type.t = ptrdiff_type.t; + vswap(); + gen_op(TOK_PDIV); + } else { + /* exactly one pointer : must be '+' or '-'. */ + if (op != '-' && op != '+') + tcc_error("cannot use pointers here"); + /* Put pointer as first operand */ + if (bt2 == VT_PTR) { + vswap(); + t = t1, t1 = t2, t2 = t; + } +#if PTR_SIZE == 4 + if ((vtop[0].type.t & VT_BTYPE) == VT_LLONG) + /* XXX: truncate here because gen_opl can't handle ptr + long long */ + gen_cast_s(VT_INT); +#endif + type1 = vtop[-1].type; + type1.t &= ~VT_ARRAY; + if (vtop[-1].type.t & VT_VLA) + vla_runtime_pointed_size(&vtop[-1].type); + else { + u = pointed_size(&vtop[-1].type); + if (u < 0) + tcc_error("unknown array element size"); +#if PTR_SIZE == 8 + vpushll(u); +#else + /* XXX: cast to int ? (long long case) */ + vpushi(u); +#endif + } + gen_op('*'); +#if 0 +/* #ifdef CONFIG_TCC_BCHECK + The main reason to removing this code: + #include <stdio.h> + int main () + { + int v[10]; + int i = 10; + int j = 9; + fprintf(stderr, "v+i-j = %p\n", v+i-j); + fprintf(stderr, "v+(i-j) = %p\n", v+(i-j)); + } + When this code is on. then the output looks like + v+i-j = 0xfffffffe + v+(i-j) = 0xbff84000 + */ + /* if evaluating constant expression, no code should be + generated, so no bound check */ + if (tcc_state->do_bounds_check && !const_wanted) { + /* if bounded pointers, we generate a special code to + test bounds */ + if (op == '-') { + vpushi(0); + vswap(); + gen_op('-'); + } + gen_bounded_ptr_add(); + } else +#endif + { + gen_opic(op); + } + /* put again type if gen_opic() swaped operands */ + vtop->type = type1; + } + } else if (is_float(bt1) || is_float(bt2)) { + /* compute bigger type and do implicit casts */ + if (bt1 == VT_LDOUBLE || bt2 == VT_LDOUBLE) { + t = VT_LDOUBLE; + } else if (bt1 == VT_DOUBLE || bt2 == VT_DOUBLE) { + t = VT_DOUBLE; + } else { + t = VT_FLOAT; + } + /* floats can only be used for a few operations */ + if (op != '+' && op != '-' && op != '*' && op != '/' && + (op < TOK_ULT || op > TOK_GT)) + tcc_error("invalid operands for binary operation"); + goto std_op; + } else if (op == TOK_SHR || op == TOK_SAR || op == TOK_SHL) { + t = bt1 == VT_LLONG ? VT_LLONG : VT_INT; + if ((t1 & (VT_BTYPE | VT_UNSIGNED | VT_BITFIELD)) == (t | VT_UNSIGNED)) + t |= VT_UNSIGNED; + t |= (VT_LONG & t1); + goto std_op; + } else if (bt1 == VT_LLONG || bt2 == VT_LLONG) { + /* cast to biggest op */ + t = VT_LLONG | VT_LONG; + if (bt1 == VT_LLONG) + t &= t1; + if (bt2 == VT_LLONG) + t &= t2; + /* convert to unsigned if it does not fit in a long long */ + if ((t1 & (VT_BTYPE | VT_UNSIGNED | VT_BITFIELD)) == (VT_LLONG | VT_UNSIGNED) || + (t2 & (VT_BTYPE | VT_UNSIGNED | VT_BITFIELD)) == (VT_LLONG | VT_UNSIGNED)) + t |= VT_UNSIGNED; + goto std_op; + } else { + /* integer operations */ + t = VT_INT | (VT_LONG & (t1 | t2)); + /* convert to unsigned if it does not fit in an integer */ + if ((t1 & (VT_BTYPE | VT_UNSIGNED | VT_BITFIELD)) == (VT_INT | VT_UNSIGNED) || + (t2 & (VT_BTYPE | VT_UNSIGNED | VT_BITFIELD)) == (VT_INT | VT_UNSIGNED)) + t |= VT_UNSIGNED; + std_op: + /* XXX: currently, some unsigned operations are explicit, so + we modify them here */ + if (t & VT_UNSIGNED) { + if (op == TOK_SAR) + op = TOK_SHR; + else if (op == '/') + op = TOK_UDIV; + else if (op == '%') + op = TOK_UMOD; + else if (op == TOK_LT) + op = TOK_ULT; + else if (op == TOK_GT) + op = TOK_UGT; + else if (op == TOK_LE) + op = TOK_ULE; + else if (op == TOK_GE) + op = TOK_UGE; + } + vswap(); + type1.t = t; + type1.ref = NULL; + gen_cast(&type1); + vswap(); + /* special case for shifts and long long: we keep the shift as + an integer */ + if (op == TOK_SHR || op == TOK_SAR || op == TOK_SHL) + type1.t = VT_INT; + gen_cast(&type1); + if (is_float(t)) + gen_opif(op); + else + gen_opic(op); + if (op >= TOK_ULT && op <= TOK_GT) { + /* relational op: the result is an int */ + vtop->type.t = VT_INT; + } else { + vtop->type.t = t; + } + } + // Make sure that we have converted to an rvalue: + if (vtop->r & VT_LVAL) + gv(is_float(vtop->type.t & VT_BTYPE) ? RC_FLOAT : RC_INT); +} + +#ifndef TCC_TARGET_ARM +/* generic itof for unsigned long long case */ +static void gen_cvt_itof1(int t) +{ +#ifdef TCC_TARGET_ARM64 + gen_cvt_itof(t); +#else + if ((vtop->type.t & (VT_BTYPE | VT_UNSIGNED)) == + (VT_LLONG | VT_UNSIGNED)) { + + if (t == VT_FLOAT) + vpush_global_sym(&func_old_type, TOK___floatundisf); +#if LDOUBLE_SIZE != 8 + else if (t == VT_LDOUBLE) + vpush_global_sym(&func_old_type, TOK___floatundixf); +#endif + else + vpush_global_sym(&func_old_type, TOK___floatundidf); + vrott(2); + gfunc_call(1); + vpushi(0); + vtop->r = reg_fret(t); + } else { + gen_cvt_itof(t); + } +#endif +} +#endif + +/* generic ftoi for unsigned long long case */ +static void gen_cvt_ftoi1(int t) +{ +#ifdef TCC_TARGET_ARM64 + gen_cvt_ftoi(t); +#else + int st; + + if (t == (VT_LLONG | VT_UNSIGNED)) { + /* not handled natively */ + st = vtop->type.t & VT_BTYPE; + if (st == VT_FLOAT) + vpush_global_sym(&func_old_type, TOK___fixunssfdi); +#if LDOUBLE_SIZE != 8 + else if (st == VT_LDOUBLE) + vpush_global_sym(&func_old_type, TOK___fixunsxfdi); +#endif + else + vpush_global_sym(&func_old_type, TOK___fixunsdfdi); + vrott(2); + gfunc_call(1); + vpushi(0); + vtop->r = REG_IRET; + vtop->r2 = REG_LRET; + } else { + gen_cvt_ftoi(t); + } +#endif +} + +/* force char or short cast */ +static void force_charshort_cast(int t) +{ + int bits, dbt; + + /* cannot cast static initializers */ + if (STATIC_DATA_WANTED) + return; + + dbt = t & VT_BTYPE; + /* XXX: add optimization if lvalue : just change type and offset */ + if (dbt == VT_BYTE) + bits = 8; + else + bits = 16; + if (t & VT_UNSIGNED) { + vpushi((1 << bits) - 1); + gen_op('&'); + } else { + if ((vtop->type.t & VT_BTYPE) == VT_LLONG) + bits = 64 - bits; + else + bits = 32 - bits; + vpushi(bits); + gen_op(TOK_SHL); + /* result must be signed or the SAR is converted to an SHL + This was not the case when "t" was a signed short + and the last value on the stack was an unsigned int */ + vtop->type.t &= ~VT_UNSIGNED; + vpushi(bits); + gen_op(TOK_SAR); + } +} + +/* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */ +static void gen_cast_s(int t) +{ + CType type; + type.t = t; + type.ref = NULL; + gen_cast(&type); +} + +static void gen_cast(CType *type) +{ + int sbt, dbt, sf, df, c, p; + + /* special delayed cast for char/short */ + /* XXX: in some cases (multiple cascaded casts), it may still + be incorrect */ + if (vtop->r & VT_MUSTCAST) { + vtop->r &= ~VT_MUSTCAST; + force_charshort_cast(vtop->type.t); + } + + /* bitfields first get cast to ints */ + if (vtop->type.t & VT_BITFIELD) { + gv(RC_INT); + } + + dbt = type->t & (VT_BTYPE | VT_UNSIGNED); + sbt = vtop->type.t & (VT_BTYPE | VT_UNSIGNED); + + if (sbt != dbt) { + sf = is_float(sbt); + df = is_float(dbt); + c = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST; + p = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == (VT_CONST | VT_SYM); +#if !defined TCC_IS_NATIVE && !defined TCC_IS_NATIVE_387 + c &= dbt != VT_LDOUBLE; +#endif + if (c) { + /* constant case: we can do it now */ + /* XXX: in ISOC, cannot do it if error in convert */ + if (sbt == VT_FLOAT) + vtop->c.ld = vtop->c.f; + else if (sbt == VT_DOUBLE) + vtop->c.ld = vtop->c.d; + + if (df) { + if ((sbt & VT_BTYPE) == VT_LLONG) { + if ((sbt & VT_UNSIGNED) || !(vtop->c.i >> 63)) + vtop->c.ld = vtop->c.i; + else + vtop->c.ld = -(long double)-vtop->c.i; + } else if(!sf) { + if ((sbt & VT_UNSIGNED) || !(vtop->c.i >> 31)) + vtop->c.ld = (uint32_t)vtop->c.i; + else + vtop->c.ld = -(long double)-(uint32_t)vtop->c.i; + } + + if (dbt == VT_FLOAT) + vtop->c.f = (float)vtop->c.ld; + else if (dbt == VT_DOUBLE) + vtop->c.d = (double)vtop->c.ld; + } else if (sf && dbt == (VT_LLONG|VT_UNSIGNED)) { + vtop->c.i = vtop->c.ld; + } else if (sf && dbt == VT_BOOL) { + vtop->c.i = (vtop->c.ld != 0); + } else { + if(sf) + vtop->c.i = vtop->c.ld; + else if (sbt == (VT_LLONG|VT_UNSIGNED)) + ; + else if (sbt & VT_UNSIGNED) + vtop->c.i = (uint32_t)vtop->c.i; +#if PTR_SIZE == 8 + else if (sbt == VT_PTR) + ; +#endif + else if (sbt != VT_LLONG) + vtop->c.i = ((uint32_t)vtop->c.i | + -(vtop->c.i & 0x80000000)); + + if (dbt == (VT_LLONG|VT_UNSIGNED)) + ; + else if (dbt == VT_BOOL) + vtop->c.i = (vtop->c.i != 0); +#if PTR_SIZE == 8 + else if (dbt == VT_PTR) + ; +#endif + else if (dbt != VT_LLONG) { + uint32_t m = ((dbt & VT_BTYPE) == VT_BYTE ? 0xff : + (dbt & VT_BTYPE) == VT_SHORT ? 0xffff : + 0xffffffff); + vtop->c.i &= m; + if (!(dbt & VT_UNSIGNED)) + vtop->c.i |= -(vtop->c.i & ((m >> 1) + 1)); + } + } + } else if (p && dbt == VT_BOOL) { + vtop->r = VT_CONST; + vtop->c.i = 1; + } else { + /* non constant case: generate code */ + if (sf && df) { + /* convert from fp to fp */ + gen_cvt_ftof(dbt); + } else if (df) { + /* convert int to fp */ + gen_cvt_itof1(dbt); + } else if (sf) { + /* convert fp to int */ + if (dbt == VT_BOOL) { + vpushi(0); + gen_op(TOK_NE); + } else { + /* we handle char/short/etc... with generic code */ + if (dbt != (VT_INT | VT_UNSIGNED) && + dbt != (VT_LLONG | VT_UNSIGNED) && + dbt != VT_LLONG) + dbt = VT_INT; + gen_cvt_ftoi1(dbt); + if (dbt == VT_INT && (type->t & (VT_BTYPE | VT_UNSIGNED)) != dbt) { + /* additional cast for char/short... */ + vtop->type.t = dbt; + gen_cast(type); + } + } +#if PTR_SIZE == 4 + } else if ((dbt & VT_BTYPE) == VT_LLONG) { + if ((sbt & VT_BTYPE) != VT_LLONG) { + /* scalar to long long */ + /* machine independent conversion */ + gv(RC_INT); + /* generate high word */ + if (sbt == (VT_INT | VT_UNSIGNED)) { + vpushi(0); + gv(RC_INT); + } else { + if (sbt == VT_PTR) { + /* cast from pointer to int before we apply + shift operation, which pointers don't support*/ + gen_cast_s(VT_INT); + } + gv_dup(); + vpushi(31); + gen_op(TOK_SAR); + } + /* patch second register */ + vtop[-1].r2 = vtop->r; + vpop(); + } +#else + } else if ((dbt & VT_BTYPE) == VT_LLONG || + (dbt & VT_BTYPE) == VT_PTR || + (dbt & VT_BTYPE) == VT_FUNC) { + if ((sbt & VT_BTYPE) != VT_LLONG && + (sbt & VT_BTYPE) != VT_PTR && + (sbt & VT_BTYPE) != VT_FUNC) { + /* need to convert from 32bit to 64bit */ + gv(RC_INT); + if (sbt != (VT_INT | VT_UNSIGNED)) { +#if defined(TCC_TARGET_ARM64) + gen_cvt_sxtw(); +#elif defined(TCC_TARGET_X86_64) + int r = gv(RC_INT); + /* x86_64 specific: movslq */ + o(0x6348); + o(0xc0 + (REG_VALUE(r) << 3) + REG_VALUE(r)); +#else +#error +#endif + } + } +#endif + } else if (dbt == VT_BOOL) { + /* scalar to bool */ + vpushi(0); + gen_op(TOK_NE); + } else if ((dbt & VT_BTYPE) == VT_BYTE || + (dbt & VT_BTYPE) == VT_SHORT) { + if (sbt == VT_PTR) { + vtop->type.t = VT_INT; + tcc_warning("nonportable conversion from pointer to char/short"); + } + force_charshort_cast(dbt); +#if PTR_SIZE == 4 + } else if ((dbt & VT_BTYPE) == VT_INT) { + /* scalar to int */ + if ((sbt & VT_BTYPE) == VT_LLONG) { + /* from long long: just take low order word */ + lexpand(); + vpop(); + } + /* if lvalue and single word type, nothing to do because + the lvalue already contains the real type size (see + VT_LVAL_xxx constants) */ +#endif + } + } + } else if ((dbt & VT_BTYPE) == VT_PTR && !(vtop->r & VT_LVAL)) { + /* if we are casting between pointer types, + we must update the VT_LVAL_xxx size */ + vtop->r = (vtop->r & ~VT_LVAL_TYPE) + | (lvalue_type(type->ref->type.t) & VT_LVAL_TYPE); + } + vtop->type = *type; +} + +/* return type size as known at compile time. Put alignment at 'a' */ +ST_FUNC int type_size(CType *type, int *a) +{ + Sym *s; + int bt; + + bt = type->t & VT_BTYPE; + if (bt == VT_STRUCT) { + /* struct/union */ + s = type->ref; + *a = s->r; + return s->c; + } else if (bt == VT_PTR) { + if (type->t & VT_ARRAY) { + int ts; + + s = type->ref; + ts = type_size(&s->type, a); + + if (ts < 0 && s->c < 0) + ts = -ts; + + return ts * s->c; + } else { + *a = PTR_SIZE; + return PTR_SIZE; + } + } else if (IS_ENUM(type->t) && type->ref->c == -1) { + return -1; /* incomplete enum */ + } else if (bt == VT_LDOUBLE) { + *a = LDOUBLE_ALIGN; + return LDOUBLE_SIZE; + } else if (bt == VT_DOUBLE || bt == VT_LLONG) { +#ifdef TCC_TARGET_I386 +#ifdef TCC_TARGET_PE + *a = 8; +#else + *a = 4; +#endif +#elif defined(TCC_TARGET_ARM) +#ifdef TCC_ARM_EABI + *a = 8; +#else + *a = 4; +#endif +#else + *a = 8; +#endif + return 8; + } else if (bt == VT_INT || bt == VT_FLOAT) { + *a = 4; + return 4; + } else if (bt == VT_SHORT) { + *a = 2; + return 2; + } else if (bt == VT_QLONG || bt == VT_QFLOAT) { + *a = 8; + return 16; + } else { + /* char, void, function, _Bool */ + *a = 1; + return 1; + } +} + +/* push type size as known at runtime time on top of value stack. Put + alignment at 'a' */ +ST_FUNC void vla_runtime_type_size(CType *type, int *a) +{ + if (type->t & VT_VLA) { + type_size(&type->ref->type, a); + vset(&int_type, VT_LOCAL|VT_LVAL, type->ref->c); + } else { + vpushi(type_size(type, a)); + } +} + +static void vla_sp_restore(void) { + if (vlas_in_scope) { + gen_vla_sp_restore(vla_sp_loc); + } +} + +static void vla_sp_restore_root(void) { + if (vlas_in_scope) { + gen_vla_sp_restore(vla_sp_root_loc); + } +} + +/* return the pointed type of t */ +static inline CType *pointed_type(CType *type) +{ + return &type->ref->type; +} + +/* modify type so that its it is a pointer to type. */ +ST_FUNC void mk_pointer(CType *type) +{ + Sym *s; + s = sym_push(SYM_FIELD, type, 0, -1); + type->t = VT_PTR | (type->t & VT_STORAGE); + type->ref = s; +} + +/* compare function types. OLD functions match any new functions */ +static int is_compatible_func(CType *type1, CType *type2) +{ + Sym *s1, *s2; + + s1 = type1->ref; + s2 = type2->ref; + if (!is_compatible_types(&s1->type, &s2->type)) + return 0; + /* check func_call */ + if (s1->f.func_call != s2->f.func_call) + return 0; + /* XXX: not complete */ + if (s1->f.func_type == FUNC_OLD || s2->f.func_type == FUNC_OLD) + return 1; + if (s1->f.func_type != s2->f.func_type) + return 0; + while (s1 != NULL) { + if (s2 == NULL) + return 0; + if (!is_compatible_unqualified_types(&s1->type, &s2->type)) + return 0; + s1 = s1->next; + s2 = s2->next; + } + if (s2) + return 0; + return 1; +} + +/* return true if type1 and type2 are the same. If unqualified is + true, qualifiers on the types are ignored. + + - enums are not checked as gcc __builtin_types_compatible_p () + */ +static int compare_types(CType *type1, CType *type2, int unqualified) +{ + int bt1, t1, t2; + + t1 = type1->t & VT_TYPE; + t2 = type2->t & VT_TYPE; + if (unqualified) { + /* strip qualifiers before comparing */ + t1 &= ~(VT_CONSTANT | VT_VOLATILE); + t2 &= ~(VT_CONSTANT | VT_VOLATILE); + } + + /* Default Vs explicit signedness only matters for char */ + if ((t1 & VT_BTYPE) != VT_BYTE) { + t1 &= ~VT_DEFSIGN; + t2 &= ~VT_DEFSIGN; + } + /* XXX: bitfields ? */ + if (t1 != t2) + return 0; + /* test more complicated cases */ + bt1 = t1 & VT_BTYPE; + if (bt1 == VT_PTR) { + type1 = pointed_type(type1); + type2 = pointed_type(type2); + return is_compatible_types(type1, type2); + } else if (bt1 == VT_STRUCT) { + return (type1->ref == type2->ref); + } else if (bt1 == VT_FUNC) { + return is_compatible_func(type1, type2); + } else { + return 1; + } +} + +/* return true if type1 and type2 are exactly the same (including + qualifiers). +*/ +static int is_compatible_types(CType *type1, CType *type2) +{ + return compare_types(type1,type2,0); +} + +/* return true if type1 and type2 are the same (ignoring qualifiers). +*/ +static int is_compatible_unqualified_types(CType *type1, CType *type2) +{ + return compare_types(type1,type2,1); +} + +/* print a type. If 'varstr' is not NULL, then the variable is also + printed in the type */ +/* XXX: union */ +/* XXX: add array and function pointers */ +static void type_to_str(char *buf, int buf_size, + CType *type, const char *varstr) +{ + int bt, v, t; + Sym *s, *sa; + char buf1[256]; + const char *tstr; + + t = type->t; + bt = t & VT_BTYPE; + buf[0] = '\0'; + + if (t & VT_EXTERN) + pstrcat(buf, buf_size, "extern "); + if (t & VT_STATIC) + pstrcat(buf, buf_size, "static "); + if (t & VT_TYPEDEF) + pstrcat(buf, buf_size, "typedef "); + if (t & VT_INLINE) + pstrcat(buf, buf_size, "inline "); + if (t & VT_VOLATILE) + pstrcat(buf, buf_size, "volatile "); + if (t & VT_CONSTANT) + pstrcat(buf, buf_size, "const "); + + if (((t & VT_DEFSIGN) && bt == VT_BYTE) + || ((t & VT_UNSIGNED) + && (bt == VT_SHORT || bt == VT_INT || bt == VT_LLONG) + && !IS_ENUM(t) + )) + pstrcat(buf, buf_size, (t & VT_UNSIGNED) ? "unsigned " : "signed "); + + buf_size -= strlen(buf); + buf += strlen(buf); + + switch(bt) { + case VT_VOID: + tstr = "void"; + goto add_tstr; + case VT_BOOL: + tstr = "_Bool"; + goto add_tstr; + case VT_BYTE: + tstr = "char"; + goto add_tstr; + case VT_SHORT: + tstr = "short"; + goto add_tstr; + case VT_INT: + tstr = "int"; + goto maybe_long; + case VT_LLONG: + tstr = "long long"; + maybe_long: + if (t & VT_LONG) + tstr = "long"; + if (!IS_ENUM(t)) + goto add_tstr; + tstr = "enum "; + goto tstruct; + case VT_FLOAT: + tstr = "float"; + goto add_tstr; + case VT_DOUBLE: + tstr = "double"; + goto add_tstr; + case VT_LDOUBLE: + tstr = "long double"; + add_tstr: + pstrcat(buf, buf_size, tstr); + break; + case VT_STRUCT: + tstr = "struct "; + if (IS_UNION(t)) + tstr = "union "; + tstruct: + pstrcat(buf, buf_size, tstr); + v = type->ref->v & ~SYM_STRUCT; + if (v >= SYM_FIRST_ANOM) + pstrcat(buf, buf_size, "<anonymous>"); + else + pstrcat(buf, buf_size, get_tok_str(v, NULL)); + break; + case VT_FUNC: + s = type->ref; + type_to_str(buf, buf_size, &s->type, varstr); + pstrcat(buf, buf_size, "("); + sa = s->next; + while (sa != NULL) { + type_to_str(buf1, sizeof(buf1), &sa->type, NULL); + pstrcat(buf, buf_size, buf1); + sa = sa->next; + if (sa) + pstrcat(buf, buf_size, ", "); + } + pstrcat(buf, buf_size, ")"); + goto no_var; + case VT_PTR: + s = type->ref; + if (t & VT_ARRAY) { + snprintf(buf1, sizeof(buf1), "%s[%d]", varstr ? varstr : "", s->c); + type_to_str(buf, buf_size, &s->type, buf1); + goto no_var; + } + pstrcpy(buf1, sizeof(buf1), "*"); + if (t & VT_CONSTANT) + pstrcat(buf1, buf_size, "const "); + if (t & VT_VOLATILE) + pstrcat(buf1, buf_size, "volatile "); + if (varstr) + pstrcat(buf1, sizeof(buf1), varstr); + type_to_str(buf, buf_size, &s->type, buf1); + goto no_var; + } + if (varstr) { + pstrcat(buf, buf_size, " "); + pstrcat(buf, buf_size, varstr); + } + no_var: ; +} + +/* verify type compatibility to store vtop in 'dt' type, and generate + casts if needed. */ +static void gen_assign_cast(CType *dt) +{ + CType *st, *type1, *type2; + char buf1[256], buf2[256]; + int dbt, sbt; + + st = &vtop->type; /* source type */ + dbt = dt->t & VT_BTYPE; + sbt = st->t & VT_BTYPE; + if (sbt == VT_VOID || dbt == VT_VOID) { + if (sbt == VT_VOID && dbt == VT_VOID) + ; /* + It is Ok if both are void + A test program: + void func1() {} + void func2() { + return func1(); + } + gcc accepts this program + */ + else + tcc_error("cannot cast from/to void"); + } + if (dt->t & VT_CONSTANT) + tcc_warning("assignment of read-only location"); + switch(dbt) { + case VT_PTR: + /* special cases for pointers */ + /* '0' can also be a pointer */ + if (is_null_pointer(vtop)) + goto type_ok; + /* accept implicit pointer to integer cast with warning */ + if (is_integer_btype(sbt)) { + tcc_warning("assignment makes pointer from integer without a cast"); + goto type_ok; + } + type1 = pointed_type(dt); + /* a function is implicitly a function pointer */ + if (sbt == VT_FUNC) { + if ((type1->t & VT_BTYPE) != VT_VOID && + !is_compatible_types(pointed_type(dt), st)) + tcc_warning("assignment from incompatible pointer type"); + goto type_ok; + } + if (sbt != VT_PTR) + goto error; + type2 = pointed_type(st); + if ((type1->t & VT_BTYPE) == VT_VOID || + (type2->t & VT_BTYPE) == VT_VOID) { + /* void * can match anything */ + } else { + //printf("types %08x %08x\n", type1->t, type2->t); + /* exact type match, except for qualifiers */ + if (!is_compatible_unqualified_types(type1, type2)) { + /* Like GCC don't warn by default for merely changes + in pointer target signedness. Do warn for different + base types, though, in particular for unsigned enums + and signed int targets. */ + if ((type1->t & (VT_BTYPE|VT_LONG)) != (type2->t & (VT_BTYPE|VT_LONG)) + || IS_ENUM(type1->t) || IS_ENUM(type2->t) + ) + tcc_warning("assignment from incompatible pointer type"); + } + } + /* check const and volatile */ + if ((!(type1->t & VT_CONSTANT) && (type2->t & VT_CONSTANT)) || + (!(type1->t & VT_VOLATILE) && (type2->t & VT_VOLATILE))) + tcc_warning("assignment discards qualifiers from pointer target type"); + break; + case VT_BYTE: + case VT_SHORT: + case VT_INT: + case VT_LLONG: + if (sbt == VT_PTR || sbt == VT_FUNC) { + tcc_warning("assignment makes integer from pointer without a cast"); + } else if (sbt == VT_STRUCT) { + goto case_VT_STRUCT; + } + /* XXX: more tests */ + break; + case VT_STRUCT: + case_VT_STRUCT: + if (!is_compatible_unqualified_types(dt, st)) { + error: + type_to_str(buf1, sizeof(buf1), st, NULL); + type_to_str(buf2, sizeof(buf2), dt, NULL); + tcc_error("cannot cast '%s' to '%s'", buf1, buf2); + } + break; + } + type_ok: + gen_cast(dt); +} + +/* store vtop in lvalue pushed on stack */ +ST_FUNC void vstore(void) +{ + int sbt, dbt, ft, r, t, size, align, bit_size, bit_pos, rc, delayed_cast; + + ft = vtop[-1].type.t; + sbt = vtop->type.t & VT_BTYPE; + dbt = ft & VT_BTYPE; + if ((((sbt == VT_INT || sbt == VT_SHORT) && dbt == VT_BYTE) || + (sbt == VT_INT && dbt == VT_SHORT)) + && !(vtop->type.t & VT_BITFIELD)) { + /* optimize char/short casts */ + delayed_cast = VT_MUSTCAST; + vtop->type.t = ft & VT_TYPE; + /* XXX: factorize */ + if (ft & VT_CONSTANT) + tcc_warning("assignment of read-only location"); + } else { + delayed_cast = 0; + if (!(ft & VT_BITFIELD)) + gen_assign_cast(&vtop[-1].type); + } + + if (sbt == VT_STRUCT) { + /* if structure, only generate pointer */ + /* structure assignment : generate memcpy */ + /* XXX: optimize if small size */ + size = type_size(&vtop->type, &align); + + /* destination */ + vswap(); + vtop->type.t = VT_PTR; + gaddrof(); + + /* address of memcpy() */ +#ifdef TCC_ARM_EABI + if(!(align & 7)) + vpush_global_sym(&func_old_type, TOK_memcpy8); + else if(!(align & 3)) + vpush_global_sym(&func_old_type, TOK_memcpy4); + else +#endif + /* Use memmove, rather than memcpy, as dest and src may be same: */ + vpush_global_sym(&func_old_type, TOK_memmove); + + vswap(); + /* source */ + vpushv(vtop - 2); + vtop->type.t = VT_PTR; + gaddrof(); + /* type size */ + vpushi(size); + gfunc_call(3); + + /* leave source on stack */ + } else if (ft & VT_BITFIELD) { + /* bitfield store handling */ + + /* save lvalue as expression result (example: s.b = s.a = n;) */ + vdup(), vtop[-1] = vtop[-2]; + + bit_pos = BIT_POS(ft); + bit_size = BIT_SIZE(ft); + /* remove bit field info to avoid loops */ + vtop[-1].type.t = ft & ~VT_STRUCT_MASK; + + if ((ft & VT_BTYPE) == VT_BOOL) { + gen_cast(&vtop[-1].type); + vtop[-1].type.t = (vtop[-1].type.t & ~VT_BTYPE) | (VT_BYTE | VT_UNSIGNED); + } + + r = adjust_bf(vtop - 1, bit_pos, bit_size); + if (r == VT_STRUCT) { + gen_cast_s((ft & VT_BTYPE) == VT_LLONG ? VT_LLONG : VT_INT); + store_packed_bf(bit_pos, bit_size); + } else { + unsigned long long mask = (1ULL << bit_size) - 1; + if ((ft & VT_BTYPE) != VT_BOOL) { + /* mask source */ + if ((vtop[-1].type.t & VT_BTYPE) == VT_LLONG) + vpushll(mask); + else + vpushi((unsigned)mask); + gen_op('&'); + } + /* shift source */ + vpushi(bit_pos); + gen_op(TOK_SHL); + vswap(); + /* duplicate destination */ + vdup(); + vrott(3); + /* load destination, mask and or with source */ + if ((vtop->type.t & VT_BTYPE) == VT_LLONG) + vpushll(~(mask << bit_pos)); + else + vpushi(~((unsigned)mask << bit_pos)); + gen_op('&'); + gen_op('|'); + /* store result */ + vstore(); + /* ... and discard */ + vpop(); + } + } else if (dbt == VT_VOID) { + --vtop; + } else { +#ifdef CONFIG_TCC_BCHECK + /* bound check case */ + if (vtop[-1].r & VT_MUSTBOUND) { + vswap(); + gbound(); + vswap(); + } +#endif + rc = RC_INT; + if (is_float(ft)) { + rc = RC_FLOAT; +#ifdef TCC_TARGET_X86_64 + if ((ft & VT_BTYPE) == VT_LDOUBLE) { + rc = RC_ST0; + } else if ((ft & VT_BTYPE) == VT_QFLOAT) { + rc = RC_FRET; + } +#endif + } + r = gv(rc); /* generate value */ + /* if lvalue was saved on stack, must read it */ + if ((vtop[-1].r & VT_VALMASK) == VT_LLOCAL) { + SValue sv; + t = get_reg(RC_INT); +#if PTR_SIZE == 8 + sv.type.t = VT_PTR; +#else + sv.type.t = VT_INT; +#endif + sv.r = VT_LOCAL | VT_LVAL; + sv.c.i = vtop[-1].c.i; + load(t, &sv); + vtop[-1].r = t | VT_LVAL; + } + /* two word case handling : store second register at word + 4 (or +8 for x86-64) */ +#if PTR_SIZE == 8 + if (((ft & VT_BTYPE) == VT_QLONG) || ((ft & VT_BTYPE) == VT_QFLOAT)) { + int addr_type = VT_LLONG, load_size = 8, load_type = ((vtop->type.t & VT_BTYPE) == VT_QLONG) ? VT_LLONG : VT_DOUBLE; +#else + if ((ft & VT_BTYPE) == VT_LLONG) { + int addr_type = VT_INT, load_size = 4, load_type = VT_INT; +#endif + vtop[-1].type.t = load_type; + store(r, vtop - 1); + vswap(); + /* convert to int to increment easily */ + vtop->type.t = addr_type; + gaddrof(); + vpushi(load_size); + gen_op('+'); + vtop->r |= VT_LVAL; + vswap(); + vtop[-1].type.t = load_type; + /* XXX: it works because r2 is spilled last ! */ + store(vtop->r2, vtop - 1); + } else { + store(r, vtop - 1); + } + + vswap(); + vtop--; /* NOT vpop() because on x86 it would flush the fp stack */ + vtop->r |= delayed_cast; + } +} + +/* post defines POST/PRE add. c is the token ++ or -- */ +ST_FUNC void inc(int post, int c) +{ + test_lvalue(); + vdup(); /* save lvalue */ + if (post) { + gv_dup(); /* duplicate value */ + vrotb(3); + vrotb(3); + } + /* add constant */ + vpushi(c - TOK_MID); + gen_op('+'); + vstore(); /* store value */ + if (post) + vpop(); /* if post op, return saved value */ +} + +ST_FUNC void parse_mult_str (CString *astr, const char *msg) +{ + /* read the string */ + if (tok != TOK_STR) + expect(msg); + cstr_new(astr); + while (tok == TOK_STR) { + /* XXX: add \0 handling too ? */ + cstr_cat(astr, tokc.str.data, -1); + next(); + } + cstr_ccat(astr, '\0'); +} + +/* If I is >= 1 and a power of two, returns log2(i)+1. + If I is 0 returns 0. */ +static int exact_log2p1(int i) +{ + int ret; + if (!i) + return 0; + for (ret = 1; i >= 1 << 8; ret += 8) + i >>= 8; + if (i >= 1 << 4) + ret += 4, i >>= 4; + if (i >= 1 << 2) + ret += 2, i >>= 2; + if (i >= 1 << 1) + ret++; + return ret; +} + +/* Parse __attribute__((...)) GNUC extension. */ +static void parse_attribute(AttributeDef *ad) +{ + int t, n; + CString astr; + +redo: + if (tok != TOK_ATTRIBUTE1 && tok != TOK_ATTRIBUTE2) + return; + next(); + skip('('); + skip('('); + while (tok != ')') { + if (tok < TOK_IDENT) + expect("attribute name"); + t = tok; + next(); + switch(t) { + case TOK_SECTION1: + case TOK_SECTION2: + skip('('); + parse_mult_str(&astr, "section name"); + ad->section = find_section(tcc_state, (char *)astr.data); + skip(')'); + cstr_free(&astr); + break; + case TOK_ALIAS1: + case TOK_ALIAS2: + skip('('); + parse_mult_str(&astr, "alias(\"target\")"); + ad->alias_target = /* save string as token, for later */ + tok_alloc((char*)astr.data, astr.size-1)->tok; + skip(')'); + cstr_free(&astr); + break; + case TOK_VISIBILITY1: + case TOK_VISIBILITY2: + skip('('); + parse_mult_str(&astr, + "visibility(\"default|hidden|internal|protected\")"); + if (!strcmp (astr.data, "default")) + ad->a.visibility = STV_DEFAULT; + else if (!strcmp (astr.data, "hidden")) + ad->a.visibility = STV_HIDDEN; + else if (!strcmp (astr.data, "internal")) + ad->a.visibility = STV_INTERNAL; + else if (!strcmp (astr.data, "protected")) + ad->a.visibility = STV_PROTECTED; + else + expect("visibility(\"default|hidden|internal|protected\")"); + skip(')'); + cstr_free(&astr); + break; + case TOK_ALIGNED1: + case TOK_ALIGNED2: + if (tok == '(') { + next(); + n = expr_const(); + if (n <= 0 || (n & (n - 1)) != 0) + tcc_error("alignment must be a positive power of two"); + skip(')'); + } else { + n = MAX_ALIGN; + } + ad->a.aligned = exact_log2p1(n); + if (n != 1 << (ad->a.aligned - 1)) + tcc_error("alignment of %d is larger than implemented", n); + break; + case TOK_PACKED1: + case TOK_PACKED2: + ad->a.packed = 1; + break; + case TOK_WEAK1: + case TOK_WEAK2: + ad->a.weak = 1; + break; + case TOK_UNUSED1: + case TOK_UNUSED2: + /* currently, no need to handle it because tcc does not + track unused objects */ + break; + case TOK_NORETURN1: + case TOK_NORETURN2: + /* currently, no need to handle it because tcc does not + track unused objects */ + break; + case TOK_CDECL1: + case TOK_CDECL2: + case TOK_CDECL3: + ad->f.func_call = FUNC_CDECL; + break; + case TOK_STDCALL1: + case TOK_STDCALL2: + case TOK_STDCALL3: + ad->f.func_call = FUNC_STDCALL; + break; +#ifdef TCC_TARGET_I386 + case TOK_REGPARM1: + case TOK_REGPARM2: + skip('('); + n = expr_const(); + if (n > 3) + n = 3; + else if (n < 0) + n = 0; + if (n > 0) + ad->f.func_call = FUNC_FASTCALL1 + n - 1; + skip(')'); + break; + case TOK_FASTCALL1: + case TOK_FASTCALL2: + case TOK_FASTCALL3: + ad->f.func_call = FUNC_FASTCALLW; + break; +#endif + case TOK_MODE: + skip('('); + switch(tok) { + case TOK_MODE_DI: + ad->attr_mode = VT_LLONG + 1; + break; + case TOK_MODE_QI: + ad->attr_mode = VT_BYTE + 1; + break; + case TOK_MODE_HI: + ad->attr_mode = VT_SHORT + 1; + break; + case TOK_MODE_SI: + case TOK_MODE_word: + ad->attr_mode = VT_INT + 1; + break; + default: + tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok, NULL)); + break; + } + next(); + skip(')'); + break; + case TOK_DLLEXPORT: + ad->a.dllexport = 1; + break; + case TOK_DLLIMPORT: + ad->a.dllimport = 1; + break; + default: + if (tcc_state->warn_unsupported) + tcc_warning("'%s' attribute ignored", get_tok_str(t, NULL)); + /* skip parameters */ + if (tok == '(') { + int parenthesis = 0; + do { + if (tok == '(') + parenthesis++; + else if (tok == ')') + parenthesis--; + next(); + } while (parenthesis && tok != -1); + } + break; + } + if (tok != ',') + break; + next(); + } + skip(')'); + skip(')'); + goto redo; +} + +static Sym * find_field (CType *type, int v) +{ + Sym *s = type->ref; + v |= SYM_FIELD; + while ((s = s->next) != NULL) { + if ((s->v & SYM_FIELD) && + (s->type.t & VT_BTYPE) == VT_STRUCT && + (s->v & ~SYM_FIELD) >= SYM_FIRST_ANOM) { + Sym *ret = find_field (&s->type, v); + if (ret) + return ret; + } + if (s->v == v) + break; + } + return s; +} + +static void struct_add_offset (Sym *s, int offset) +{ + while ((s = s->next) != NULL) { + if ((s->v & SYM_FIELD) && + (s->type.t & VT_BTYPE) == VT_STRUCT && + (s->v & ~SYM_FIELD) >= SYM_FIRST_ANOM) { + struct_add_offset(s->type.ref, offset); + } else + s->c += offset; + } +} + +static void struct_layout(CType *type, AttributeDef *ad) +{ + int size, align, maxalign, offset, c, bit_pos, bit_size; + int packed, a, bt, prevbt, prev_bit_size; + int pcc = !tcc_state->ms_bitfields; + int pragma_pack = *tcc_state->pack_stack_ptr; + Sym *f; + + maxalign = 1; + offset = 0; + c = 0; + bit_pos = 0; + prevbt = VT_STRUCT; /* make it never match */ + prev_bit_size = 0; + +//#define BF_DEBUG + + for (f = type->ref->next; f; f = f->next) { + if (f->type.t & VT_BITFIELD) + bit_size = BIT_SIZE(f->type.t); + else + bit_size = -1; + size = type_size(&f->type, &align); + a = f->a.aligned ? 1 << (f->a.aligned - 1) : 0; + packed = 0; + + if (pcc && bit_size == 0) { + /* in pcc mode, packing does not affect zero-width bitfields */ + + } else { + /* in pcc mode, attribute packed overrides if set. */ + if (pcc && (f->a.packed || ad->a.packed)) + align = packed = 1; + + /* pragma pack overrides align if lesser and packs bitfields always */ + if (pragma_pack) { + packed = 1; + if (pragma_pack < align) + align = pragma_pack; + /* in pcc mode pragma pack also overrides individual align */ + if (pcc && pragma_pack < a) + a = 0; + } + } + /* some individual align was specified */ + if (a) + align = a; + + if (type->ref->type.t == VT_UNION) { + if (pcc && bit_size >= 0) + size = (bit_size + 7) >> 3; + offset = 0; + if (size > c) + c = size; + + } else if (bit_size < 0) { + if (pcc) + c += (bit_pos + 7) >> 3; + c = (c + align - 1) & -align; + offset = c; + if (size > 0) + c += size; + bit_pos = 0; + prevbt = VT_STRUCT; + prev_bit_size = 0; + + } else { + /* A bit-field. Layout is more complicated. There are two + options: PCC (GCC) compatible and MS compatible */ + if (pcc) { + /* In PCC layout a bit-field is placed adjacent to the + preceding bit-fields, except if: + - it has zero-width + - an individual alignment was given + - it would overflow its base type container and + there is no packing */ + if (bit_size == 0) { + new_field: + c = (c + ((bit_pos + 7) >> 3) + align - 1) & -align; + bit_pos = 0; + } else if (f->a.aligned) { + goto new_field; + } else if (!packed) { + int a8 = align * 8; + int ofs = ((c * 8 + bit_pos) % a8 + bit_size + a8 - 1) / a8; + if (ofs > size / align) + goto new_field; + } + + /* in pcc mode, long long bitfields have type int if they fit */ + if (size == 8 && bit_size <= 32) + f->type.t = (f->type.t & ~VT_BTYPE) | VT_INT, size = 4; + + while (bit_pos >= align * 8) + c += align, bit_pos -= align * 8; + offset = c; + + /* In PCC layout named bit-fields influence the alignment + of the containing struct using the base types alignment, + except for packed fields (which here have correct align). */ + if (f->v & SYM_FIRST_ANOM + // && bit_size // ??? gcc on ARM/rpi does that + ) + align = 1; + + } else { + bt = f->type.t & VT_BTYPE; + if ((bit_pos + bit_size > size * 8) + || (bit_size > 0) == (bt != prevbt) + ) { + c = (c + align - 1) & -align; + offset = c; + bit_pos = 0; + /* In MS bitfield mode a bit-field run always uses + at least as many bits as the underlying type. + To start a new run it's also required that this + or the last bit-field had non-zero width. */ + if (bit_size || prev_bit_size) + c += size; + } + /* In MS layout the records alignment is normally + influenced by the field, except for a zero-width + field at the start of a run (but by further zero-width + fields it is again). */ + if (bit_size == 0 && prevbt != bt) + align = 1; + prevbt = bt; + prev_bit_size = bit_size; + } + + f->type.t = (f->type.t & ~(0x3f << VT_STRUCT_SHIFT)) + | (bit_pos << VT_STRUCT_SHIFT); + bit_pos += bit_size; + } + if (align > maxalign) + maxalign = align; + +#ifdef BF_DEBUG + printf("set field %s offset %-2d size %-2d align %-2d", + get_tok_str(f->v & ~SYM_FIELD, NULL), offset, size, align); + if (f->type.t & VT_BITFIELD) { + printf(" pos %-2d bits %-2d", + BIT_POS(f->type.t), + BIT_SIZE(f->type.t) + ); + } + printf("\n"); +#endif + + if (f->v & SYM_FIRST_ANOM && (f->type.t & VT_BTYPE) == VT_STRUCT) { + Sym *ass; + /* An anonymous struct/union. Adjust member offsets + to reflect the real offset of our containing struct. + Also set the offset of this anon member inside + the outer struct to be zero. Via this it + works when accessing the field offset directly + (from base object), as well as when recursing + members in initializer handling. */ + int v2 = f->type.ref->v; + if (!(v2 & SYM_FIELD) && + (v2 & ~SYM_STRUCT) < SYM_FIRST_ANOM) { + Sym **pps; + /* This happens only with MS extensions. The + anon member has a named struct type, so it + potentially is shared with other references. + We need to unshare members so we can modify + them. */ + ass = f->type.ref; + f->type.ref = sym_push(anon_sym++ | SYM_FIELD, + &f->type.ref->type, 0, + f->type.ref->c); + pps = &f->type.ref->next; + while ((ass = ass->next) != NULL) { + *pps = sym_push(ass->v, &ass->type, 0, ass->c); + pps = &((*pps)->next); + } + *pps = NULL; + } + struct_add_offset(f->type.ref, offset); + f->c = 0; + } else { + f->c = offset; + } + + f->r = 0; + } + + if (pcc) + c += (bit_pos + 7) >> 3; + + /* store size and alignment */ + a = bt = ad->a.aligned ? 1 << (ad->a.aligned - 1) : 1; + if (a < maxalign) + a = maxalign; + type->ref->r = a; + if (pragma_pack && pragma_pack < maxalign && 0 == pcc) { + /* can happen if individual align for some member was given. In + this case MSVC ignores maxalign when aligning the size */ + a = pragma_pack; + if (a < bt) + a = bt; + } + c = (c + a - 1) & -a; + type->ref->c = c; + +#ifdef BF_DEBUG + printf("struct size %-2d align %-2d\n\n", c, a), fflush(stdout); +#endif + + /* check whether we can access bitfields by their type */ + for (f = type->ref->next; f; f = f->next) { + int s, px, cx, c0; + CType t; + + if (0 == (f->type.t & VT_BITFIELD)) + continue; + f->type.ref = f; + f->auxtype = -1; + bit_size = BIT_SIZE(f->type.t); + if (bit_size == 0) + continue; + bit_pos = BIT_POS(f->type.t); + size = type_size(&f->type, &align); + if (bit_pos + bit_size <= size * 8 && f->c + size <= c) + continue; + + /* try to access the field using a different type */ + c0 = -1, s = align = 1; + for (;;) { + px = f->c * 8 + bit_pos; + cx = (px >> 3) & -align; + px = px - (cx << 3); + if (c0 == cx) + break; + s = (px + bit_size + 7) >> 3; + if (s > 4) { + t.t = VT_LLONG; + } else if (s > 2) { + t.t = VT_INT; + } else if (s > 1) { + t.t = VT_SHORT; + } else { + t.t = VT_BYTE; + } + s = type_size(&t, &align); + c0 = cx; + } + + if (px + bit_size <= s * 8 && cx + s <= c) { + /* update offset and bit position */ + f->c = cx; + bit_pos = px; + f->type.t = (f->type.t & ~(0x3f << VT_STRUCT_SHIFT)) + | (bit_pos << VT_STRUCT_SHIFT); + if (s != size) + f->auxtype = t.t; +#ifdef BF_DEBUG + printf("FIX field %s offset %-2d size %-2d align %-2d " + "pos %-2d bits %-2d\n", + get_tok_str(f->v & ~SYM_FIELD, NULL), + cx, s, align, px, bit_size); +#endif + } else { + /* fall back to load/store single-byte wise */ + f->auxtype = VT_STRUCT; +#ifdef BF_DEBUG + printf("FIX field %s : load byte-wise\n", + get_tok_str(f->v & ~SYM_FIELD, NULL)); +#endif + } + } +} + +/* enum/struct/union declaration. u is VT_ENUM/VT_STRUCT/VT_UNION */ +static void struct_decl(CType *type, int u) +{ + int v, c, size, align, flexible; + int bit_size, bsize, bt; + Sym *s, *ss, **ps; + AttributeDef ad, ad1; + CType type1, btype; + + memset(&ad, 0, sizeof ad); + next(); + parse_attribute(&ad); + if (tok != '{') { + v = tok; + next(); + /* struct already defined ? return it */ + if (v < TOK_IDENT) + expect("struct/union/enum name"); + s = struct_find(v); + if (s && (s->sym_scope == local_scope || tok != '{')) { + if (u == s->type.t) + goto do_decl; + if (u == VT_ENUM && IS_ENUM(s->type.t)) + goto do_decl; + tcc_error("redefinition of '%s'", get_tok_str(v, NULL)); + } + } else { + v = anon_sym++; + } + /* Record the original enum/struct/union token. */ + type1.t = u == VT_ENUM ? u | VT_INT | VT_UNSIGNED : u; + type1.ref = NULL; + /* we put an undefined size for struct/union */ + s = sym_push(v | SYM_STRUCT, &type1, 0, -1); + s->r = 0; /* default alignment is zero as gcc */ +do_decl: + type->t = s->type.t; + type->ref = s; + + if (tok == '{') { + next(); + if (s->c != -1) + tcc_error("struct/union/enum already defined"); + /* cannot be empty */ + /* non empty enums are not allowed */ + ps = &s->next; + if (u == VT_ENUM) { + long long ll = 0, pl = 0, nl = 0; + CType t; + t.ref = s; + /* enum symbols have static storage */ + t.t = VT_INT|VT_STATIC|VT_ENUM_VAL; + for(;;) { + v = tok; + if (v < TOK_UIDENT) + expect("identifier"); + ss = sym_find(v); + if (ss && !local_stack) + tcc_error("redefinition of enumerator '%s'", + get_tok_str(v, NULL)); + next(); + if (tok == '=') { + next(); + ll = expr_const64(); + } + ss = sym_push(v, &t, VT_CONST, 0); + ss->enum_val = ll; + *ps = ss, ps = &ss->next; + if (ll < nl) + nl = ll; + if (ll > pl) + pl = ll; + if (tok != ',') + break; + next(); + ll++; + /* NOTE: we accept a trailing comma */ + if (tok == '}') + break; + } + skip('}'); + /* set integral type of the enum */ + t.t = VT_INT; + if (nl >= 0) { + if (pl != (unsigned)pl) + t.t = (LONG_SIZE==8 ? VT_LLONG|VT_LONG : VT_LLONG); + t.t |= VT_UNSIGNED; + } else if (pl != (int)pl || nl != (int)nl) + t.t = (LONG_SIZE==8 ? VT_LLONG|VT_LONG : VT_LLONG); + s->type.t = type->t = t.t | VT_ENUM; + s->c = 0; + /* set type for enum members */ + for (ss = s->next; ss; ss = ss->next) { + ll = ss->enum_val; + if (ll == (int)ll) /* default is int if it fits */ + continue; + if (t.t & VT_UNSIGNED) { + ss->type.t |= VT_UNSIGNED; + if (ll == (unsigned)ll) + continue; + } + ss->type.t = (ss->type.t & ~VT_BTYPE) + | (LONG_SIZE==8 ? VT_LLONG|VT_LONG : VT_LLONG); + } + } else { + c = 0; + flexible = 0; + while (tok != '}') { + if (!parse_btype(&btype, &ad1)) { + skip(';'); + continue; + } + while (1) { + if (flexible) + tcc_error("flexible array member '%s' not at the end of struct", + get_tok_str(v, NULL)); + bit_size = -1; + v = 0; + type1 = btype; + if (tok != ':') { + if (tok != ';') + type_decl(&type1, &ad1, &v, TYPE_DIRECT); + if (v == 0) { + if ((type1.t & VT_BTYPE) != VT_STRUCT) + expect("identifier"); + else { + int v = btype.ref->v; + if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) { + if (tcc_state->ms_extensions == 0) + expect("identifier"); + } + } + } + if (type_size(&type1, &align) < 0) { + if ((u == VT_STRUCT) && (type1.t & VT_ARRAY) && c) + flexible = 1; + else + tcc_error("field '%s' has incomplete type", + get_tok_str(v, NULL)); + } + if ((type1.t & VT_BTYPE) == VT_FUNC || + (type1.t & VT_STORAGE)) + tcc_error("invalid type for '%s'", + get_tok_str(v, NULL)); + } + if (tok == ':') { + next(); + bit_size = expr_const(); + /* XXX: handle v = 0 case for messages */ + if (bit_size < 0) + tcc_error("negative width in bit-field '%s'", + get_tok_str(v, NULL)); + if (v && bit_size == 0) + tcc_error("zero width for bit-field '%s'", + get_tok_str(v, NULL)); + parse_attribute(&ad1); + } + size = type_size(&type1, &align); + if (bit_size >= 0) { + bt = type1.t & VT_BTYPE; + if (bt != VT_INT && + bt != VT_BYTE && + bt != VT_SHORT && + bt != VT_BOOL && + bt != VT_LLONG) + tcc_error("bitfields must have scalar type"); + bsize = size * 8; + if (bit_size > bsize) { + tcc_error("width of '%s' exceeds its type", + get_tok_str(v, NULL)); + } else if (bit_size == bsize + && !ad.a.packed && !ad1.a.packed) { + /* no need for bit fields */ + ; + } else if (bit_size == 64) { + tcc_error("field width 64 not implemented"); + } else { + type1.t = (type1.t & ~VT_STRUCT_MASK) + | VT_BITFIELD + | (bit_size << (VT_STRUCT_SHIFT + 6)); + } + } + if (v != 0 || (type1.t & VT_BTYPE) == VT_STRUCT) { + /* Remember we've seen a real field to check + for placement of flexible array member. */ + c = 1; + } + /* If member is a struct or bit-field, enforce + placing into the struct (as anonymous). */ + if (v == 0 && + ((type1.t & VT_BTYPE) == VT_STRUCT || + bit_size >= 0)) { + v = anon_sym++; + } + if (v) { + ss = sym_push(v | SYM_FIELD, &type1, 0, 0); + ss->a = ad1.a; + *ps = ss; + ps = &ss->next; + } + if (tok == ';' || tok == TOK_EOF) + break; + skip(','); + } + skip(';'); + } + skip('}'); + parse_attribute(&ad); + struct_layout(type, &ad); + } + } +} + +static void sym_to_attr(AttributeDef *ad, Sym *s) +{ + if (s->a.aligned && 0 == ad->a.aligned) + ad->a.aligned = s->a.aligned; + if (s->f.func_call && 0 == ad->f.func_call) + ad->f.func_call = s->f.func_call; + if (s->f.func_type && 0 == ad->f.func_type) + ad->f.func_type = s->f.func_type; + if (s->a.packed) + ad->a.packed = 1; +} + +/* Add type qualifiers to a type. If the type is an array then the qualifiers + are added to the element type, copied because it could be a typedef. */ +static void parse_btype_qualify(CType *type, int qualifiers) +{ + while (type->t & VT_ARRAY) { + type->ref = sym_push(SYM_FIELD, &type->ref->type, 0, type->ref->c); + type = &type->ref->type; + } + type->t |= qualifiers; +} + +/* return 0 if no type declaration. otherwise, return the basic type + and skip it. + */ +static int parse_btype(CType *type, AttributeDef *ad) +{ + int t, u, bt, st, type_found, typespec_found, g; + Sym *s; + CType type1; + + memset(ad, 0, sizeof(AttributeDef)); + type_found = 0; + typespec_found = 0; + t = VT_INT; + bt = st = -1; + type->ref = NULL; + + while(1) { + switch(tok) { + case TOK_EXTENSION: + /* currently, we really ignore extension */ + next(); + continue; + + /* basic types */ + case TOK_CHAR: + u = VT_BYTE; + basic_type: + next(); + basic_type1: + if (u == VT_SHORT || u == VT_LONG) { + if (st != -1 || (bt != -1 && bt != VT_INT)) + tmbt: tcc_error("too many basic types"); + st = u; + } else { + if (bt != -1 || (st != -1 && u != VT_INT)) + goto tmbt; + bt = u; + } + if (u != VT_INT) + t = (t & ~(VT_BTYPE|VT_LONG)) | u; + typespec_found = 1; + break; + case TOK_VOID: + u = VT_VOID; + goto basic_type; + case TOK_SHORT: + u = VT_SHORT; + goto basic_type; + case TOK_INT: + u = VT_INT; + goto basic_type; + case TOK_LONG: + if ((t & VT_BTYPE) == VT_DOUBLE) { + t = (t & ~(VT_BTYPE|VT_LONG)) | VT_LDOUBLE; + } else if ((t & (VT_BTYPE|VT_LONG)) == VT_LONG) { + t = (t & ~(VT_BTYPE|VT_LONG)) | VT_LLONG; + } else { + u = VT_LONG; + goto basic_type; + } + next(); + break; +#ifdef TCC_TARGET_ARM64 + case TOK_UINT128: + /* GCC's __uint128_t appears in some Linux header files. Make it a + synonym for long double to get the size and alignment right. */ + u = VT_LDOUBLE; + goto basic_type; +#endif + case TOK_BOOL: + u = VT_BOOL; + goto basic_type; + case TOK_FLOAT: + u = VT_FLOAT; + goto basic_type; + case TOK_DOUBLE: + if ((t & (VT_BTYPE|VT_LONG)) == VT_LONG) { + t = (t & ~(VT_BTYPE|VT_LONG)) | VT_LDOUBLE; + } else { + u = VT_DOUBLE; + goto basic_type; + } + next(); + break; + case TOK_ENUM: + struct_decl(&type1, VT_ENUM); + basic_type2: + u = type1.t; + type->ref = type1.ref; + goto basic_type1; + case TOK_STRUCT: + struct_decl(&type1, VT_STRUCT); + goto basic_type2; + case TOK_UNION: + struct_decl(&type1, VT_UNION); + goto basic_type2; + + /* type modifiers */ + case TOK_CONST1: + case TOK_CONST2: + case TOK_CONST3: + type->t = t; + parse_btype_qualify(type, VT_CONSTANT); + t = type->t; + next(); + break; + case TOK_VOLATILE1: + case TOK_VOLATILE2: + case TOK_VOLATILE3: + type->t = t; + parse_btype_qualify(type, VT_VOLATILE); + t = type->t; + next(); + break; + case TOK_SIGNED1: + case TOK_SIGNED2: + case TOK_SIGNED3: + if ((t & (VT_DEFSIGN|VT_UNSIGNED)) == (VT_DEFSIGN|VT_UNSIGNED)) + tcc_error("signed and unsigned modifier"); + t |= VT_DEFSIGN; + next(); + typespec_found = 1; + break; + case TOK_REGISTER: + case TOK_AUTO: + case TOK_RESTRICT1: + case TOK_RESTRICT2: + case TOK_RESTRICT3: + next(); + break; + case TOK_UNSIGNED: + if ((t & (VT_DEFSIGN|VT_UNSIGNED)) == VT_DEFSIGN) + tcc_error("signed and unsigned modifier"); + t |= VT_DEFSIGN | VT_UNSIGNED; + next(); + typespec_found = 1; + break; + + /* storage */ + case TOK_EXTERN: + g = VT_EXTERN; + goto storage; + case TOK_STATIC: + g = VT_STATIC; + goto storage; + case TOK_TYPEDEF: + g = VT_TYPEDEF; + goto storage; + storage: + if (t & (VT_EXTERN|VT_STATIC|VT_TYPEDEF) & ~g) + tcc_error("multiple storage classes"); + t |= g; + next(); + break; + case TOK_INLINE1: + case TOK_INLINE2: + case TOK_INLINE3: + t |= VT_INLINE; + next(); + break; + + /* GNUC attribute */ + case TOK_ATTRIBUTE1: + case TOK_ATTRIBUTE2: + parse_attribute(ad); + if (ad->attr_mode) { + u = ad->attr_mode -1; + t = (t & ~(VT_BTYPE|VT_LONG)) | u; + } + break; + /* GNUC typeof */ + case TOK_TYPEOF1: + case TOK_TYPEOF2: + case TOK_TYPEOF3: + next(); + parse_expr_type(&type1); + /* remove all storage modifiers except typedef */ + type1.t &= ~(VT_STORAGE&~VT_TYPEDEF); + if (type1.ref) + sym_to_attr(ad, type1.ref); + goto basic_type2; + default: + if (typespec_found) + goto the_end; + s = sym_find(tok); + if (!s || !(s->type.t & VT_TYPEDEF)) + goto the_end; + t &= ~(VT_BTYPE|VT_LONG); + u = t & ~(VT_CONSTANT | VT_VOLATILE), t ^= u; + type->t = (s->type.t & ~VT_TYPEDEF) | u; + type->ref = s->type.ref; + if (t) + parse_btype_qualify(type, t); + t = type->t; + /* get attributes from typedef */ + sym_to_attr(ad, s); + next(); + typespec_found = 1; + st = bt = -2; + break; + } + type_found = 1; + } +the_end: + if (tcc_state->char_is_unsigned) { + if ((t & (VT_DEFSIGN|VT_BTYPE)) == VT_BYTE) + t |= VT_UNSIGNED; + } + /* VT_LONG is used just as a modifier for VT_INT / VT_LLONG */ + bt = t & (VT_BTYPE|VT_LONG); + if (bt == VT_LONG) + t |= LONG_SIZE == 8 ? VT_LLONG : VT_INT; +#ifdef TCC_TARGET_PE + if (bt == VT_LDOUBLE) + t = (t & ~(VT_BTYPE|VT_LONG)) | VT_DOUBLE; +#endif + type->t = t; + return type_found; +} + +/* convert a function parameter type (array to pointer and function to + function pointer) */ +static inline void convert_parameter_type(CType *pt) +{ + /* remove const and volatile qualifiers (XXX: const could be used + to indicate a const function parameter */ + pt->t &= ~(VT_CONSTANT | VT_VOLATILE); + /* array must be transformed to pointer according to ANSI C */ + pt->t &= ~VT_ARRAY; + if ((pt->t & VT_BTYPE) == VT_FUNC) { + mk_pointer(pt); + } +} + +ST_FUNC void parse_asm_str(CString *astr) +{ + skip('('); + parse_mult_str(astr, "string constant"); +} + +/* Parse an asm label and return the token */ +static int asm_label_instr(void) +{ + int v; + CString astr; + + next(); + parse_asm_str(&astr); + skip(')'); +#ifdef ASM_DEBUG + printf("asm_alias: \"%s\"\n", (char *)astr.data); +#endif + v = tok_alloc(astr.data, astr.size - 1)->tok; + cstr_free(&astr); + return v; +} + +static int post_type(CType *type, AttributeDef *ad, int storage, int td) +{ + int n, l, t1, arg_size, align; + Sym **plast, *s, *first; + AttributeDef ad1; + CType pt; + + if (tok == '(') { + /* function type, or recursive declarator (return if so) */ + next(); + if (td && !(td & TYPE_ABSTRACT)) + return 0; + if (tok == ')') + l = 0; + else if (parse_btype(&pt, &ad1)) + l = FUNC_NEW; + else if (td) + return 0; + else + l = FUNC_OLD; + first = NULL; + plast = &first; + arg_size = 0; + if (l) { + for(;;) { + /* read param name and compute offset */ + if (l != FUNC_OLD) { + if ((pt.t & VT_BTYPE) == VT_VOID && tok == ')') + break; + type_decl(&pt, &ad1, &n, TYPE_DIRECT | TYPE_ABSTRACT); + if ((pt.t & VT_BTYPE) == VT_VOID) + tcc_error("parameter declared as void"); + arg_size += (type_size(&pt, &align) + PTR_SIZE - 1) / PTR_SIZE; + } else { + n = tok; + if (n < TOK_UIDENT) + expect("identifier"); + pt.t = VT_VOID; /* invalid type */ + next(); + } + convert_parameter_type(&pt); + s = sym_push(n | SYM_FIELD, &pt, 0, 0); + *plast = s; + plast = &s->next; + if (tok == ')') + break; + skip(','); + if (l == FUNC_NEW && tok == TOK_DOTS) { + l = FUNC_ELLIPSIS; + next(); + break; + } + if (l == FUNC_NEW && !parse_btype(&pt, &ad1)) + tcc_error("invalid type"); + } + } else + /* if no parameters, then old type prototype */ + l = FUNC_OLD; + skip(')'); + /* NOTE: const is ignored in returned type as it has a special + meaning in gcc / C++ */ + type->t &= ~VT_CONSTANT; + /* some ancient pre-K&R C allows a function to return an array + and the array brackets to be put after the arguments, such + that "int c()[]" means something like "int[] c()" */ + if (tok == '[') { + next(); + skip(']'); /* only handle simple "[]" */ + mk_pointer(type); + } + /* we push a anonymous symbol which will contain the function prototype */ + ad->f.func_args = arg_size; + ad->f.func_type = l; + s = sym_push(SYM_FIELD, type, 0, 0); + s->a = ad->a; + s->f = ad->f; + s->next = first; + type->t = VT_FUNC; + type->ref = s; + } else if (tok == '[') { + int saved_nocode_wanted = nocode_wanted; + /* array definition */ + next(); + if (tok == TOK_RESTRICT1) + next(); + n = -1; + t1 = 0; + if (tok != ']') { + if (!local_stack || (storage & VT_STATIC)) + vpushi(expr_const()); + else { + /* VLAs (which can only happen with local_stack && !VT_STATIC) + length must always be evaluated, even under nocode_wanted, + so that its size slot is initialized (e.g. under sizeof + or typeof). */ + nocode_wanted = 0; + gexpr(); + } + if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) { + n = vtop->c.i; + if (n < 0) + tcc_error("invalid array size"); + } else { + if (!is_integer_btype(vtop->type.t & VT_BTYPE)) + tcc_error("size of variable length array should be an integer"); + t1 = VT_VLA; + } + } + skip(']'); + /* parse next post type */ + post_type(type, ad, storage, 0); + if (type->t == VT_FUNC) + tcc_error("declaration of an array of functions"); + t1 |= type->t & VT_VLA; + + if (t1 & VT_VLA) { + loc -= type_size(&int_type, &align); + loc &= -align; + n = loc; + + vla_runtime_type_size(type, &align); + gen_op('*'); + vset(&int_type, VT_LOCAL|VT_LVAL, n); + vswap(); + vstore(); + } + if (n != -1) + vpop(); + nocode_wanted = saved_nocode_wanted; + + /* we push an anonymous symbol which will contain the array + element type */ + s = sym_push(SYM_FIELD, type, 0, n); + type->t = (t1 ? VT_VLA : VT_ARRAY) | VT_PTR; + type->ref = s; + } + return 1; +} + +/* Parse a type declarator (except basic type), and return the type + in 'type'. 'td' is a bitmask indicating which kind of type decl is + expected. 'type' should contain the basic type. 'ad' is the + attribute definition of the basic type. It can be modified by + type_decl(). If this (possibly abstract) declarator is a pointer chain + it returns the innermost pointed to type (equals *type, but is a different + pointer), otherwise returns type itself, that's used for recursive calls. */ +static CType *type_decl(CType *type, AttributeDef *ad, int *v, int td) +{ + CType *post, *ret; + int qualifiers, storage; + + /* recursive type, remove storage bits first, apply them later again */ + storage = type->t & VT_STORAGE; + type->t &= ~VT_STORAGE; + post = ret = type; + + while (tok == '*') { + qualifiers = 0; + redo: + next(); + switch(tok) { + case TOK_CONST1: + case TOK_CONST2: + case TOK_CONST3: + qualifiers |= VT_CONSTANT; + goto redo; + case TOK_VOLATILE1: + case TOK_VOLATILE2: + case TOK_VOLATILE3: + qualifiers |= VT_VOLATILE; + goto redo; + case TOK_RESTRICT1: + case TOK_RESTRICT2: + case TOK_RESTRICT3: + goto redo; + /* XXX: clarify attribute handling */ + case TOK_ATTRIBUTE1: + case TOK_ATTRIBUTE2: + parse_attribute(ad); + break; + } + mk_pointer(type); + type->t |= qualifiers; + if (ret == type) + /* innermost pointed to type is the one for the first derivation */ + ret = pointed_type(type); + } + + if (tok == '(') { + /* This is possibly a parameter type list for abstract declarators + ('int ()'), use post_type for testing this. */ + if (!post_type(type, ad, 0, td)) { + /* It's not, so it's a nested declarator, and the post operations + apply to the innermost pointed to type (if any). */ + /* XXX: this is not correct to modify 'ad' at this point, but + the syntax is not clear */ + parse_attribute(ad); + post = type_decl(type, ad, v, td); + skip(')'); + } + } else if (tok >= TOK_IDENT && (td & TYPE_DIRECT)) { + /* type identifier */ + *v = tok; + next(); + } else { + if (!(td & TYPE_ABSTRACT)) + expect("identifier"); + *v = 0; + } + post_type(post, ad, storage, 0); + parse_attribute(ad); + type->t |= storage; + return ret; +} + +/* compute the lvalue VT_LVAL_xxx needed to match type t. */ +ST_FUNC int lvalue_type(int t) +{ + int bt, r; + r = VT_LVAL; + bt = t & VT_BTYPE; + if (bt == VT_BYTE || bt == VT_BOOL) + r |= VT_LVAL_BYTE; + else if (bt == VT_SHORT) + r |= VT_LVAL_SHORT; + else + return r; + if (t & VT_UNSIGNED) + r |= VT_LVAL_UNSIGNED; + return r; +} + +/* indirection with full error checking and bound check */ +ST_FUNC void indir(void) +{ + if ((vtop->type.t & VT_BTYPE) != VT_PTR) { + if ((vtop->type.t & VT_BTYPE) == VT_FUNC) + return; + expect("pointer"); + } + if (vtop->r & VT_LVAL) + gv(RC_INT); + vtop->type = *pointed_type(&vtop->type); + /* Arrays and functions are never lvalues */ + if (!(vtop->type.t & VT_ARRAY) && !(vtop->type.t & VT_VLA) + && (vtop->type.t & VT_BTYPE) != VT_FUNC) { + vtop->r |= lvalue_type(vtop->type.t); + /* if bound checking, the referenced pointer must be checked */ +#ifdef CONFIG_TCC_BCHECK + if (tcc_state->do_bounds_check) + vtop->r |= VT_MUSTBOUND; +#endif + } +} + +/* pass a parameter to a function and do type checking and casting */ +static void gfunc_param_typed(Sym *func, Sym *arg) +{ + int func_type; + CType type; + + func_type = func->f.func_type; + if (func_type == FUNC_OLD || + (func_type == FUNC_ELLIPSIS && arg == NULL)) { + /* default casting : only need to convert float to double */ + if ((vtop->type.t & VT_BTYPE) == VT_FLOAT) { + gen_cast_s(VT_DOUBLE); + } else if (vtop->type.t & VT_BITFIELD) { + type.t = vtop->type.t & (VT_BTYPE | VT_UNSIGNED); + type.ref = vtop->type.ref; + gen_cast(&type); + } + } else if (arg == NULL) { + tcc_error("too many arguments to function"); + } else { + type = arg->type; + type.t &= ~VT_CONSTANT; /* need to do that to avoid false warning */ + gen_assign_cast(&type); + } +} + +/* parse an expression and return its type without any side effect. */ +static void expr_type(CType *type, void (*expr_fn)(void)) +{ + nocode_wanted++; + expr_fn(); + *type = vtop->type; + vpop(); + nocode_wanted--; +} + +/* parse an expression of the form '(type)' or '(expr)' and return its + type */ +static void parse_expr_type(CType *type) +{ + int n; + AttributeDef ad; + + skip('('); + if (parse_btype(type, &ad)) { + type_decl(type, &ad, &n, TYPE_ABSTRACT); + } else { + expr_type(type, gexpr); + } + skip(')'); +} + +static void parse_type(CType *type) +{ + AttributeDef ad; + int n; + + if (!parse_btype(type, &ad)) { + expect("type"); + } + type_decl(type, &ad, &n, TYPE_ABSTRACT); +} + +static void parse_builtin_params(int nc, const char *args) +{ + char c, sep = '('; + CType t; + if (nc) + nocode_wanted++; + next(); + while ((c = *args++)) { + skip(sep); + sep = ','; + switch (c) { + case 'e': expr_eq(); continue; + case 't': parse_type(&t); vpush(&t); continue; + default: tcc_error("internal error"); break; + } + } + skip(')'); + if (nc) + nocode_wanted--; +} + +ST_FUNC void unary(void) +{ + int n, t, align, size, r, sizeof_caller; + CType type; + Sym *s; + AttributeDef ad; + + sizeof_caller = in_sizeof; + in_sizeof = 0; + type.ref = NULL; + /* XXX: GCC 2.95.3 does not generate a table although it should be + better here */ + tok_next: + switch(tok) { + case TOK_EXTENSION: + next(); + goto tok_next; + case TOK_LCHAR: +#ifdef TCC_TARGET_PE + t = VT_SHORT|VT_UNSIGNED; + goto push_tokc; +#endif + case TOK_CINT: + case TOK_CCHAR: + t = VT_INT; + push_tokc: + type.t = t; + vsetc(&type, VT_CONST, &tokc); + next(); + break; + case TOK_CUINT: + t = VT_INT | VT_UNSIGNED; + goto push_tokc; + case TOK_CLLONG: + t = VT_LLONG; + goto push_tokc; + case TOK_CULLONG: + t = VT_LLONG | VT_UNSIGNED; + goto push_tokc; + case TOK_CFLOAT: + t = VT_FLOAT; + goto push_tokc; + case TOK_CDOUBLE: + t = VT_DOUBLE; + goto push_tokc; + case TOK_CLDOUBLE: + t = VT_LDOUBLE; + goto push_tokc; + case TOK_CLONG: + t = (LONG_SIZE == 8 ? VT_LLONG : VT_INT) | VT_LONG; + goto push_tokc; + case TOK_CULONG: + t = (LONG_SIZE == 8 ? VT_LLONG : VT_INT) | VT_LONG | VT_UNSIGNED; + goto push_tokc; + case TOK___FUNCTION__: + if (!gnu_ext) + goto tok_identifier; + /* fall thru */ + case TOK___FUNC__: + { + void *ptr; + int len; + /* special function name identifier */ + len = strlen(funcname) + 1; + /* generate char[len] type */ + type.t = VT_BYTE; + mk_pointer(&type); + type.t |= VT_ARRAY; + type.ref->c = len; + vpush_ref(&type, data_section, data_section->data_offset, len); + if (!NODATA_WANTED) { + ptr = section_ptr_add(data_section, len); + memcpy(ptr, funcname, len); + } + next(); + } + break; + case TOK_LSTR: +#ifdef TCC_TARGET_PE + t = VT_SHORT | VT_UNSIGNED; +#else + t = VT_INT; +#endif + goto str_init; + case TOK_STR: + /* string parsing */ + t = VT_BYTE; + if (tcc_state->char_is_unsigned) + t = VT_BYTE | VT_UNSIGNED; + str_init: + if (tcc_state->warn_write_strings) + t |= VT_CONSTANT; + type.t = t; + mk_pointer(&type); + type.t |= VT_ARRAY; + memset(&ad, 0, sizeof(AttributeDef)); + decl_initializer_alloc(&type, &ad, VT_CONST, 2, 0, 0); + break; + case '(': + next(); + /* cast ? */ + if (parse_btype(&type, &ad)) { + type_decl(&type, &ad, &n, TYPE_ABSTRACT); + skip(')'); + /* check ISOC99 compound literal */ + if (tok == '{') { + /* data is allocated locally by default */ + if (global_expr) + r = VT_CONST; + else + r = VT_LOCAL; + /* all except arrays are lvalues */ + if (!(type.t & VT_ARRAY)) + r |= lvalue_type(type.t); + memset(&ad, 0, sizeof(AttributeDef)); + decl_initializer_alloc(&type, &ad, r, 1, 0, 0); + } else { + if (sizeof_caller) { + vpush(&type); + return; + } + unary(); + gen_cast(&type); + } + } else if (tok == '{') { + int saved_nocode_wanted = nocode_wanted; + if (const_wanted) + tcc_error("expected constant"); + /* save all registers */ + save_regs(0); + /* statement expression : we do not accept break/continue + inside as GCC does. We do retain the nocode_wanted state, + as statement expressions can't ever be entered from the + outside, so any reactivation of code emission (from labels + or loop heads) can be disabled again after the end of it. */ + block(NULL, NULL, 1); + nocode_wanted = saved_nocode_wanted; + skip(')'); + } else { + gexpr(); + skip(')'); + } + break; + case '*': + next(); + unary(); + indir(); + break; + case '&': + next(); + unary(); + /* functions names must be treated as function pointers, + except for unary '&' and sizeof. Since we consider that + functions are not lvalues, we only have to handle it + there and in function calls. */ + /* arrays can also be used although they are not lvalues */ + if ((vtop->type.t & VT_BTYPE) != VT_FUNC && + !(vtop->type.t & VT_ARRAY)) + test_lvalue(); + mk_pointer(&vtop->type); + gaddrof(); + break; + case '!': + next(); + unary(); + if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) { + gen_cast_s(VT_BOOL); + vtop->c.i = !vtop->c.i; + } else if ((vtop->r & VT_VALMASK) == VT_CMP) + vtop->c.i ^= 1; + else { + save_regs(1); + vseti(VT_JMP, gvtst(1, 0)); + } + break; + case '~': + next(); + unary(); + vpushi(-1); + gen_op('^'); + break; + case '+': + next(); + unary(); + if ((vtop->type.t & VT_BTYPE) == VT_PTR) + tcc_error("pointer not accepted for unary plus"); + /* In order to force cast, we add zero, except for floating point + where we really need an noop (otherwise -0.0 will be transformed + into +0.0). */ + if (!is_float(vtop->type.t)) { + vpushi(0); + gen_op('+'); + } + break; + case TOK_SIZEOF: + case TOK_ALIGNOF1: + case TOK_ALIGNOF2: + t = tok; + next(); + in_sizeof++; + expr_type(&type, unary); /* Perform a in_sizeof = 0; */ + s = vtop[1].sym; /* hack: accessing previous vtop */ + size = type_size(&type, &align); + if (s && s->a.aligned) + align = 1 << (s->a.aligned - 1); + if (t == TOK_SIZEOF) { + if (!(type.t & VT_VLA)) { + if (size < 0) + tcc_error("sizeof applied to an incomplete type"); + vpushs(size); + } else { + vla_runtime_type_size(&type, &align); + } + } else { + vpushs(align); + } + vtop->type.t |= VT_UNSIGNED; + break; + + case TOK_builtin_expect: + /* __builtin_expect is a no-op for now */ + parse_builtin_params(0, "ee"); + vpop(); + break; + case TOK_builtin_types_compatible_p: + parse_builtin_params(0, "tt"); + vtop[-1].type.t &= ~(VT_CONSTANT | VT_VOLATILE); + vtop[0].type.t &= ~(VT_CONSTANT | VT_VOLATILE); + n = is_compatible_types(&vtop[-1].type, &vtop[0].type); + vtop -= 2; + vpushi(n); + break; + case TOK_builtin_choose_expr: + { + int64_t c; + next(); + skip('('); + c = expr_const64(); + skip(','); + if (!c) { + nocode_wanted++; + } + expr_eq(); + if (!c) { + vpop(); + nocode_wanted--; + } + skip(','); + if (c) { + nocode_wanted++; + } + expr_eq(); + if (c) { + vpop(); + nocode_wanted--; + } + skip(')'); + } + break; + case TOK_builtin_constant_p: + parse_builtin_params(1, "e"); + n = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST; + vtop--; + vpushi(n); + break; + case TOK_builtin_frame_address: + case TOK_builtin_return_address: + { + int tok1 = tok; + int level; + next(); + skip('('); + if (tok != TOK_CINT) { + tcc_error("%s only takes positive integers", + tok1 == TOK_builtin_return_address ? + "__builtin_return_address" : + "__builtin_frame_address"); + } + level = (uint32_t)tokc.i; + next(); + skip(')'); + type.t = VT_VOID; + mk_pointer(&type); + vset(&type, VT_LOCAL, 0); /* local frame */ + while (level--) { + mk_pointer(&vtop->type); + indir(); /* -> parent frame */ + } + if (tok1 == TOK_builtin_return_address) { + // assume return address is just above frame pointer on stack + vpushi(PTR_SIZE); + gen_op('+'); + mk_pointer(&vtop->type); + indir(); + } + } + break; +#ifdef TCC_TARGET_X86_64 +#ifdef TCC_TARGET_PE + case TOK_builtin_va_start: + parse_builtin_params(0, "ee"); + r = vtop->r & VT_VALMASK; + if (r == VT_LLOCAL) + r = VT_LOCAL; + if (r != VT_LOCAL) + tcc_error("__builtin_va_start expects a local variable"); + vtop->r = r; + vtop->type = char_pointer_type; + vtop->c.i += 8; + vstore(); + break; +#else + case TOK_builtin_va_arg_types: + parse_builtin_params(0, "t"); + vpushi(classify_x86_64_va_arg(&vtop->type)); + vswap(); + vpop(); + break; +#endif +#endif + +#ifdef TCC_TARGET_ARM64 + case TOK___va_start: { + parse_builtin_params(0, "ee"); + //xx check types + gen_va_start(); + vpushi(0); + vtop->type.t = VT_VOID; + break; + } + case TOK___va_arg: { + parse_builtin_params(0, "et"); + type = vtop->type; + vpop(); + //xx check types + gen_va_arg(&type); + vtop->type = type; + break; + } + case TOK___arm64_clear_cache: { + parse_builtin_params(0, "ee"); + gen_clear_cache(); + vpushi(0); + vtop->type.t = VT_VOID; + break; + } +#endif + /* pre operations */ + case TOK_INC: + case TOK_DEC: + t = tok; + next(); + unary(); + inc(0, t); + break; + case '-': + next(); + unary(); + t = vtop->type.t & VT_BTYPE; + if (is_float(t)) { + /* In IEEE negate(x) isn't subtract(0,x), but rather + subtract(-0, x). */ + vpush(&vtop->type); + if (t == VT_FLOAT) + vtop->c.f = -1.0 * 0.0; + else if (t == VT_DOUBLE) + vtop->c.d = -1.0 * 0.0; + else + vtop->c.ld = -1.0 * 0.0; + } else + vpushi(0); + vswap(); + gen_op('-'); + break; + case TOK_LAND: + if (!gnu_ext) + goto tok_identifier; + next(); + /* allow to take the address of a label */ + if (tok < TOK_UIDENT) + expect("label identifier"); + s = label_find(tok); + if (!s) { + s = label_push(&global_label_stack, tok, LABEL_FORWARD); + } else { + if (s->r == LABEL_DECLARED) + s->r = LABEL_FORWARD; + } + if (!s->type.t) { + s->type.t = VT_VOID; + mk_pointer(&s->type); + s->type.t |= VT_STATIC; + } + vpushsym(&s->type, s); + next(); + break; + + case TOK_GENERIC: + { + CType controlling_type; + int has_default = 0; + int has_match = 0; + int learn = 0; + TokenString *str = NULL; + + next(); + skip('('); + expr_type(&controlling_type, expr_eq); + controlling_type.t &= ~(VT_CONSTANT | VT_VOLATILE | VT_ARRAY); + for (;;) { + learn = 0; + skip(','); + if (tok == TOK_DEFAULT) { + if (has_default) + tcc_error("too many 'default'"); + has_default = 1; + if (!has_match) + learn = 1; + next(); + } else { + AttributeDef ad_tmp; + int itmp; + CType cur_type; + parse_btype(&cur_type, &ad_tmp); + type_decl(&cur_type, &ad_tmp, &itmp, TYPE_ABSTRACT); + if (compare_types(&controlling_type, &cur_type, 0)) { + if (has_match) { + tcc_error("type match twice"); + } + has_match = 1; + learn = 1; + } + } + skip(':'); + if (learn) { + if (str) + tok_str_free(str); + skip_or_save_block(&str); + } else { + skip_or_save_block(NULL); + } + if (tok == ')') + break; + } + if (!str) { + char buf[60]; + type_to_str(buf, sizeof buf, &controlling_type, NULL); + tcc_error("type '%s' does not match any association", buf); + } + begin_macro(str, 1); + next(); + expr_eq(); + if (tok != TOK_EOF) + expect(","); + end_macro(); + next(); + break; + } + // special qnan , snan and infinity values + case TOK___NAN__: + vpush64(VT_DOUBLE, 0x7ff8000000000000ULL); + next(); + break; + case TOK___SNAN__: + vpush64(VT_DOUBLE, 0x7ff0000000000001ULL); + next(); + break; + case TOK___INF__: + vpush64(VT_DOUBLE, 0x7ff0000000000000ULL); + next(); + break; + + default: + tok_identifier: + t = tok; + next(); + if (t < TOK_UIDENT) + expect("identifier"); + s = sym_find(t); + if (!s || IS_ASM_SYM(s)) { + const char *name = get_tok_str(t, NULL); + if (tok != '(') + tcc_error("'%s' undeclared", name); + /* for simple function calls, we tolerate undeclared + external reference to int() function */ + if (tcc_state->warn_implicit_function_declaration +#ifdef TCC_TARGET_PE + /* people must be warned about using undeclared WINAPI functions + (which usually start with uppercase letter) */ + || (name[0] >= 'A' && name[0] <= 'Z') +#endif + ) + tcc_warning("implicit declaration of function '%s'", name); + s = external_global_sym(t, &func_old_type, 0); + } + + r = s->r; + /* A symbol that has a register is a local register variable, + which starts out as VT_LOCAL value. */ + if ((r & VT_VALMASK) < VT_CONST) + r = (r & ~VT_VALMASK) | VT_LOCAL; + + vset(&s->type, r, s->c); + /* Point to s as backpointer (even without r&VT_SYM). + Will be used by at least the x86 inline asm parser for + regvars. */ + vtop->sym = s; + + if (r & VT_SYM) { + vtop->c.i = 0; + } else if (r == VT_CONST && IS_ENUM_VAL(s->type.t)) { + vtop->c.i = s->enum_val; + } + break; + } + + /* post operations */ + while (1) { + if (tok == TOK_INC || tok == TOK_DEC) { + inc(1, tok); + next(); + } else if (tok == '.' || tok == TOK_ARROW || tok == TOK_CDOUBLE) { + int qualifiers; + /* field */ + if (tok == TOK_ARROW) + indir(); + qualifiers = vtop->type.t & (VT_CONSTANT | VT_VOLATILE); + test_lvalue(); + gaddrof(); + /* expect pointer on structure */ + if ((vtop->type.t & VT_BTYPE) != VT_STRUCT) + expect("struct or union"); + if (tok == TOK_CDOUBLE) + expect("field name"); + next(); + if (tok == TOK_CINT || tok == TOK_CUINT) + expect("field name"); + s = find_field(&vtop->type, tok); + if (!s) + tcc_error("field not found: %s", get_tok_str(tok & ~SYM_FIELD, &tokc)); + /* add field offset to pointer */ + vtop->type = char_pointer_type; /* change type to 'char *' */ + vpushi(s->c); + gen_op('+'); + /* change type to field type, and set to lvalue */ + vtop->type = s->type; + vtop->type.t |= qualifiers; + /* an array is never an lvalue */ + if (!(vtop->type.t & VT_ARRAY)) { + vtop->r |= lvalue_type(vtop->type.t); +#ifdef CONFIG_TCC_BCHECK + /* if bound checking, the referenced pointer must be checked */ + if (tcc_state->do_bounds_check && (vtop->r & VT_VALMASK) != VT_LOCAL) + vtop->r |= VT_MUSTBOUND; +#endif + } + next(); + } else if (tok == '[') { + next(); + gexpr(); + gen_op('+'); + indir(); + skip(']'); + } else if (tok == '(') { + SValue ret; + Sym *sa; + int nb_args, ret_nregs, ret_align, regsize, variadic; + + /* function call */ + if ((vtop->type.t & VT_BTYPE) != VT_FUNC) { + /* pointer test (no array accepted) */ + if ((vtop->type.t & (VT_BTYPE | VT_ARRAY)) == VT_PTR) { + vtop->type = *pointed_type(&vtop->type); + if ((vtop->type.t & VT_BTYPE) != VT_FUNC) + goto error_func; + } else { + error_func: + expect("function pointer"); + } + } else { + vtop->r &= ~VT_LVAL; /* no lvalue */ + } + /* get return type */ + s = vtop->type.ref; + next(); + sa = s->next; /* first parameter */ + nb_args = regsize = 0; + ret.r2 = VT_CONST; + /* compute first implicit argument if a structure is returned */ + if ((s->type.t & VT_BTYPE) == VT_STRUCT) { + variadic = (s->f.func_type == FUNC_ELLIPSIS); + ret_nregs = gfunc_sret(&s->type, variadic, &ret.type, + &ret_align, ®size); + if (!ret_nregs) { + /* get some space for the returned structure */ + size = type_size(&s->type, &align); +#ifdef TCC_TARGET_ARM64 + /* On arm64, a small struct is return in registers. + It is much easier to write it to memory if we know + that we are allowed to write some extra bytes, so + round the allocated space up to a power of 2: */ + if (size < 16) + while (size & (size - 1)) + size = (size | (size - 1)) + 1; +#endif + loc = (loc - size) & -align; + ret.type = s->type; + ret.r = VT_LOCAL | VT_LVAL; + /* pass it as 'int' to avoid structure arg passing + problems */ + vseti(VT_LOCAL, loc); + ret.c = vtop->c; + nb_args++; + } + } else { + ret_nregs = 1; + ret.type = s->type; + } + + if (ret_nregs) { + /* return in register */ + if (is_float(ret.type.t)) { + ret.r = reg_fret(ret.type.t); +#ifdef TCC_TARGET_X86_64 + if ((ret.type.t & VT_BTYPE) == VT_QFLOAT) + ret.r2 = REG_QRET; +#endif + } else { +#ifndef TCC_TARGET_ARM64 +#ifdef TCC_TARGET_X86_64 + if ((ret.type.t & VT_BTYPE) == VT_QLONG) +#else + if ((ret.type.t & VT_BTYPE) == VT_LLONG) +#endif + ret.r2 = REG_LRET; +#endif + ret.r = REG_IRET; + } + ret.c.i = 0; + } + if (tok != ')') { + for(;;) { + expr_eq(); + gfunc_param_typed(s, sa); + nb_args++; + if (sa) + sa = sa->next; + if (tok == ')') + break; + skip(','); + } + } + if (sa) + tcc_error("too few arguments to function"); + skip(')'); + gfunc_call(nb_args); + + /* return value */ + for (r = ret.r + ret_nregs + !ret_nregs; r-- > ret.r;) { + vsetc(&ret.type, r, &ret.c); + vtop->r2 = ret.r2; /* Loop only happens when r2 is VT_CONST */ + } + + /* handle packed struct return */ + if (((s->type.t & VT_BTYPE) == VT_STRUCT) && ret_nregs) { + int addr, offset; + + size = type_size(&s->type, &align); + /* We're writing whole regs often, make sure there's enough + space. Assume register size is power of 2. */ + if (regsize > align) + align = regsize; + loc = (loc - size) & -align; + addr = loc; + offset = 0; + for (;;) { + vset(&ret.type, VT_LOCAL | VT_LVAL, addr + offset); + vswap(); + vstore(); + vtop--; + if (--ret_nregs == 0) + break; + offset += regsize; + } + vset(&s->type, VT_LOCAL | VT_LVAL, addr); + } + } else { + break; + } + } +} + +ST_FUNC void expr_prod(void) +{ + int t; + + unary(); + while (tok == '*' || tok == '/' || tok == '%') { + t = tok; + next(); + unary(); + gen_op(t); + } +} + +ST_FUNC void expr_sum(void) +{ + int t; + + expr_prod(); + while (tok == '+' || tok == '-') { + t = tok; + next(); + expr_prod(); + gen_op(t); + } +} + +static void expr_shift(void) +{ + int t; + + expr_sum(); + while (tok == TOK_SHL || tok == TOK_SAR) { + t = tok; + next(); + expr_sum(); + gen_op(t); + } +} + +static void expr_cmp(void) +{ + int t; + + expr_shift(); + while ((tok >= TOK_ULE && tok <= TOK_GT) || + tok == TOK_ULT || tok == TOK_UGE) { + t = tok; + next(); + expr_shift(); + gen_op(t); + } +} + +static void expr_cmpeq(void) +{ + int t; + + expr_cmp(); + while (tok == TOK_EQ || tok == TOK_NE) { + t = tok; + next(); + expr_cmp(); + gen_op(t); + } +} + +static void expr_and(void) +{ + expr_cmpeq(); + while (tok == '&') { + next(); + expr_cmpeq(); + gen_op('&'); + } +} + +static void expr_xor(void) +{ + expr_and(); + while (tok == '^') { + next(); + expr_and(); + gen_op('^'); + } +} + +static void expr_or(void) +{ + expr_xor(); + while (tok == '|') { + next(); + expr_xor(); + gen_op('|'); + } +} + +static void expr_land(void) +{ + expr_or(); + if (tok == TOK_LAND) { + int t = 0; + for(;;) { + if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) { + gen_cast_s(VT_BOOL); + if (vtop->c.i) { + vpop(); + } else { + nocode_wanted++; + while (tok == TOK_LAND) { + next(); + expr_or(); + vpop(); + } + nocode_wanted--; + if (t) + gsym(t); + gen_cast_s(VT_INT); + break; + } + } else { + if (!t) + save_regs(1); + t = gvtst(1, t); + } + if (tok != TOK_LAND) { + if (t) + vseti(VT_JMPI, t); + else + vpushi(1); + break; + } + next(); + expr_or(); + } + } +} + +static void expr_lor(void) +{ + expr_land(); + if (tok == TOK_LOR) { + int t = 0; + for(;;) { + if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) { + gen_cast_s(VT_BOOL); + if (!vtop->c.i) { + vpop(); + } else { + nocode_wanted++; + while (tok == TOK_LOR) { + next(); + expr_land(); + vpop(); + } + nocode_wanted--; + if (t) + gsym(t); + gen_cast_s(VT_INT); + break; + } + } else { + if (!t) + save_regs(1); + t = gvtst(0, t); + } + if (tok != TOK_LOR) { + if (t) + vseti(VT_JMP, t); + else + vpushi(0); + break; + } + next(); + expr_land(); + } + } +} + +/* Assuming vtop is a value used in a conditional context + (i.e. compared with zero) return 0 if it's false, 1 if + true and -1 if it can't be statically determined. */ +static int condition_3way(void) +{ + int c = -1; + if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST && + (!(vtop->r & VT_SYM) || !vtop->sym->a.weak)) { + vdup(); + gen_cast_s(VT_BOOL); + c = vtop->c.i; + vpop(); + } + return c; +} + +static void expr_cond(void) +{ + int tt, u, r1, r2, rc, t1, t2, bt1, bt2, islv, c, g; + SValue sv; + CType type, type1, type2; + + expr_lor(); + if (tok == '?') { + next(); + c = condition_3way(); + g = (tok == ':' && gnu_ext); + if (c < 0) { + /* needed to avoid having different registers saved in + each branch */ + if (is_float(vtop->type.t)) { + rc = RC_FLOAT; +#ifdef TCC_TARGET_X86_64 + if ((vtop->type.t & VT_BTYPE) == VT_LDOUBLE) { + rc = RC_ST0; + } +#endif + } else + rc = RC_INT; + gv(rc); + save_regs(1); + if (g) + gv_dup(); + tt = gvtst(1, 0); + + } else { + if (!g) + vpop(); + tt = 0; + } + + if (1) { + if (c == 0) + nocode_wanted++; + if (!g) + gexpr(); + + type1 = vtop->type; + sv = *vtop; /* save value to handle it later */ + vtop--; /* no vpop so that FP stack is not flushed */ + skip(':'); + + u = 0; + if (c < 0) + u = gjmp(0); + gsym(tt); + + if (c == 0) + nocode_wanted--; + if (c == 1) + nocode_wanted++; + expr_cond(); + if (c == 1) + nocode_wanted--; + + type2 = vtop->type; + t1 = type1.t; + bt1 = t1 & VT_BTYPE; + t2 = type2.t; + bt2 = t2 & VT_BTYPE; + type.ref = NULL; + + /* cast operands to correct type according to ISOC rules */ + if (is_float(bt1) || is_float(bt2)) { + if (bt1 == VT_LDOUBLE || bt2 == VT_LDOUBLE) { + type.t = VT_LDOUBLE; + + } else if (bt1 == VT_DOUBLE || bt2 == VT_DOUBLE) { + type.t = VT_DOUBLE; + } else { + type.t = VT_FLOAT; + } + } else if (bt1 == VT_LLONG || bt2 == VT_LLONG) { + /* cast to biggest op */ + type.t = VT_LLONG | VT_LONG; + if (bt1 == VT_LLONG) + type.t &= t1; + if (bt2 == VT_LLONG) + type.t &= t2; + /* convert to unsigned if it does not fit in a long long */ + if ((t1 & (VT_BTYPE | VT_UNSIGNED | VT_BITFIELD)) == (VT_LLONG | VT_UNSIGNED) || + (t2 & (VT_BTYPE | VT_UNSIGNED | VT_BITFIELD)) == (VT_LLONG | VT_UNSIGNED)) + type.t |= VT_UNSIGNED; + } else if (bt1 == VT_PTR || bt2 == VT_PTR) { + /* If one is a null ptr constant the result type + is the other. */ + if (is_null_pointer (vtop)) + type = type1; + else if (is_null_pointer (&sv)) + type = type2; + /* XXX: test pointer compatibility, C99 has more elaborate + rules here. */ + else + type = type1; + } else if (bt1 == VT_FUNC || bt2 == VT_FUNC) { + /* XXX: test function pointer compatibility */ + type = bt1 == VT_FUNC ? type1 : type2; + } else if (bt1 == VT_STRUCT || bt2 == VT_STRUCT) { + /* XXX: test structure compatibility */ + type = bt1 == VT_STRUCT ? type1 : type2; + } else if (bt1 == VT_VOID || bt2 == VT_VOID) { + /* NOTE: as an extension, we accept void on only one side */ + type.t = VT_VOID; + } else { + /* integer operations */ + type.t = VT_INT | (VT_LONG & (t1 | t2)); + /* convert to unsigned if it does not fit in an integer */ + if ((t1 & (VT_BTYPE | VT_UNSIGNED | VT_BITFIELD)) == (VT_INT | VT_UNSIGNED) || + (t2 & (VT_BTYPE | VT_UNSIGNED | VT_BITFIELD)) == (VT_INT | VT_UNSIGNED)) + type.t |= VT_UNSIGNED; + } + /* keep structs lvalue by transforming `(expr ? a : b)` to `*(expr ? &a : &b)` so + that `(expr ? a : b).mem` does not error with "lvalue expected" */ + islv = (vtop->r & VT_LVAL) && (sv.r & VT_LVAL) && VT_STRUCT == (type.t & VT_BTYPE); + islv &= c < 0; + + /* now we convert second operand */ + if (c != 1) { + gen_cast(&type); + if (islv) { + mk_pointer(&vtop->type); + gaddrof(); + } else if (VT_STRUCT == (vtop->type.t & VT_BTYPE)) + gaddrof(); + } + + rc = RC_INT; + if (is_float(type.t)) { + rc = RC_FLOAT; +#ifdef TCC_TARGET_X86_64 + if ((type.t & VT_BTYPE) == VT_LDOUBLE) { + rc = RC_ST0; + } +#endif + } else if ((type.t & VT_BTYPE) == VT_LLONG) { + /* for long longs, we use fixed registers to avoid having + to handle a complicated move */ + rc = RC_IRET; + } + + tt = r2 = 0; + if (c < 0) { + r2 = gv(rc); + tt = gjmp(0); + } + gsym(u); + + /* this is horrible, but we must also convert first + operand */ + if (c != 0) { + *vtop = sv; + gen_cast(&type); + if (islv) { + mk_pointer(&vtop->type); + gaddrof(); + } else if (VT_STRUCT == (vtop->type.t & VT_BTYPE)) + gaddrof(); + } + + if (c < 0) { + r1 = gv(rc); + move_reg(r2, r1, type.t); + vtop->r = r2; + gsym(tt); + if (islv) + indir(); + } + } + } +} + +static void expr_eq(void) +{ + int t; + + expr_cond(); + if (tok == '=' || + (tok >= TOK_A_MOD && tok <= TOK_A_DIV) || + tok == TOK_A_XOR || tok == TOK_A_OR || + tok == TOK_A_SHL || tok == TOK_A_SAR) { + test_lvalue(); + t = tok; + next(); + if (t == '=') { + expr_eq(); + } else { + vdup(); + expr_eq(); + gen_op(t & 0x7f); + } + vstore(); + } +} + +ST_FUNC void gexpr(void) +{ + while (1) { + expr_eq(); + if (tok != ',') + break; + vpop(); + next(); + } +} + +/* parse a constant expression and return value in vtop. */ +static void expr_const1(void) +{ + const_wanted++; + nocode_wanted++; + expr_cond(); + nocode_wanted--; + const_wanted--; +} + +/* parse an integer constant and return its value. */ +static inline int64_t expr_const64(void) +{ + int64_t c; + expr_const1(); + if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST) + expect("constant expression"); + c = vtop->c.i; + vpop(); + return c; +} + +/* parse an integer constant and return its value. + Complain if it doesn't fit 32bit (signed or unsigned). */ +ST_FUNC int expr_const(void) +{ + int c; + int64_t wc = expr_const64(); + c = wc; + if (c != wc && (unsigned)c != wc) + tcc_error("constant exceeds 32 bit"); + return c; +} + +/* return the label token if current token is a label, otherwise + return zero */ +static int is_label(void) +{ + int last_tok; + + /* fast test first */ + if (tok < TOK_UIDENT) + return 0; + /* no need to save tokc because tok is an identifier */ + last_tok = tok; + next(); + if (tok == ':') { + return last_tok; + } else { + unget_tok(last_tok); + return 0; + } +} + +#ifndef TCC_TARGET_ARM64 +static void gfunc_return(CType *func_type) +{ + if ((func_type->t & VT_BTYPE) == VT_STRUCT) { + CType type, ret_type; + int ret_align, ret_nregs, regsize; + ret_nregs = gfunc_sret(func_type, func_var, &ret_type, + &ret_align, ®size); + if (0 == ret_nregs) { + /* if returning structure, must copy it to implicit + first pointer arg location */ + type = *func_type; + mk_pointer(&type); + vset(&type, VT_LOCAL | VT_LVAL, func_vc); + indir(); + vswap(); + /* copy structure value to pointer */ + vstore(); + } else { + /* returning structure packed into registers */ + int r, size, addr, align; + size = type_size(func_type,&align); + if ((vtop->r != (VT_LOCAL | VT_LVAL) || + (vtop->c.i & (ret_align-1))) + && (align & (ret_align-1))) { + loc = (loc - size) & -ret_align; + addr = loc; + type = *func_type; + vset(&type, VT_LOCAL | VT_LVAL, addr); + vswap(); + vstore(); + vpop(); + vset(&ret_type, VT_LOCAL | VT_LVAL, addr); + } + vtop->type = ret_type; + if (is_float(ret_type.t)) + r = rc_fret(ret_type.t); + else + r = RC_IRET; + + if (ret_nregs == 1) + gv(r); + else { + for (;;) { + vdup(); + gv(r); + vpop(); + if (--ret_nregs == 0) + break; + /* We assume that when a structure is returned in multiple + registers, their classes are consecutive values of the + suite s(n) = 2^n */ + r <<= 1; + vtop->c.i += regsize; + } + } + } + } else if (is_float(func_type->t)) { + gv(rc_fret(func_type->t)); + } else { + gv(RC_IRET); + } + vtop--; /* NOT vpop() because on x86 it would flush the fp stack */ +} +#endif + +static int case_cmp(const void *pa, const void *pb) +{ + int64_t a = (*(struct case_t**) pa)->v1; + int64_t b = (*(struct case_t**) pb)->v1; + return a < b ? -1 : a > b; +} + +static void gcase(struct case_t **base, int len, int *bsym) +{ + struct case_t *p; + int e; + int ll = (vtop->type.t & VT_BTYPE) == VT_LLONG; + gv(RC_INT); + while (len > 4) { + /* binary search */ + p = base[len/2]; + vdup(); + if (ll) + vpushll(p->v2); + else + vpushi(p->v2); + gen_op(TOK_LE); + e = gtst(1, 0); + vdup(); + if (ll) + vpushll(p->v1); + else + vpushi(p->v1); + gen_op(TOK_GE); + gtst_addr(0, p->sym); /* v1 <= x <= v2 */ + /* x < v1 */ + gcase(base, len/2, bsym); + if (cur_switch->def_sym) + gjmp_addr(cur_switch->def_sym); + else + *bsym = gjmp(*bsym); + /* x > v2 */ + gsym(e); + e = len/2 + 1; + base += e; len -= e; + } + /* linear scan */ + while (len--) { + p = *base++; + vdup(); + if (ll) + vpushll(p->v2); + else + vpushi(p->v2); + if (p->v1 == p->v2) { + gen_op(TOK_EQ); + gtst_addr(0, p->sym); + } else { + gen_op(TOK_LE); + e = gtst(1, 0); + vdup(); + if (ll) + vpushll(p->v1); + else + vpushi(p->v1); + gen_op(TOK_GE); + gtst_addr(0, p->sym); + gsym(e); + } + } +} + +static void block(int *bsym, int *csym, int is_expr) +{ + int a, b, c, d, cond; + Sym *s; + + /* generate line number info */ + if (tcc_state->do_debug) + tcc_debug_line(tcc_state); + + if (is_expr) { + /* default return value is (void) */ + vpushi(0); + vtop->type.t = VT_VOID; + } + + if (tok == TOK_IF) { + /* if test */ + int saved_nocode_wanted = nocode_wanted; + next(); + skip('('); + gexpr(); + skip(')'); + cond = condition_3way(); + if (cond == 1) + a = 0, vpop(); + else + a = gvtst(1, 0); + if (cond == 0) + nocode_wanted |= 0x20000000; + block(bsym, csym, 0); + if (cond != 1) + nocode_wanted = saved_nocode_wanted; + c = tok; + if (c == TOK_ELSE) { + next(); + d = gjmp(0); + gsym(a); + if (cond == 1) + nocode_wanted |= 0x20000000; + block(bsym, csym, 0); + gsym(d); /* patch else jmp */ + if (cond != 0) + nocode_wanted = saved_nocode_wanted; + } else + gsym(a); + } else if (tok == TOK_WHILE) { + int saved_nocode_wanted; + nocode_wanted &= ~0x20000000; + next(); + d = ind; + vla_sp_restore(); + skip('('); + gexpr(); + skip(')'); + a = gvtst(1, 0); + b = 0; + ++local_scope; + saved_nocode_wanted = nocode_wanted; + block(&a, &b, 0); + nocode_wanted = saved_nocode_wanted; + --local_scope; + gjmp_addr(d); + gsym(a); + gsym_addr(b, d); + } else if (tok == '{') { + Sym *llabel; + int block_vla_sp_loc = vla_sp_loc, saved_vlas_in_scope = vlas_in_scope; + + next(); + /* record local declaration stack position */ + s = local_stack; + llabel = local_label_stack; + ++local_scope; + + /* handle local labels declarations */ + if (tok == TOK_LABEL) { + next(); + for(;;) { + if (tok < TOK_UIDENT) + expect("label identifier"); + label_push(&local_label_stack, tok, LABEL_DECLARED); + next(); + if (tok == ',') { + next(); + } else { + skip(';'); + break; + } + } + } + while (tok != '}') { + if ((a = is_label())) + unget_tok(a); + else + decl(VT_LOCAL); + if (tok != '}') { + if (is_expr) + vpop(); + block(bsym, csym, is_expr); + } + } + /* pop locally defined labels */ + label_pop(&local_label_stack, llabel, is_expr); + /* pop locally defined symbols */ + --local_scope; + /* In the is_expr case (a statement expression is finished here), + vtop might refer to symbols on the local_stack. Either via the + type or via vtop->sym. We can't pop those nor any that in turn + might be referred to. To make it easier we don't roll back + any symbols in that case; some upper level call to block() will + do that. We do have to remove such symbols from the lookup + tables, though. sym_pop will do that. */ + sym_pop(&local_stack, s, is_expr); + + /* Pop VLA frames and restore stack pointer if required */ + if (vlas_in_scope > saved_vlas_in_scope) { + vla_sp_loc = saved_vlas_in_scope ? block_vla_sp_loc : vla_sp_root_loc; + vla_sp_restore(); + } + vlas_in_scope = saved_vlas_in_scope; + + next(); + } else if (tok == TOK_RETURN) { + next(); + if (tok != ';') { + gexpr(); + gen_assign_cast(&func_vt); + if ((func_vt.t & VT_BTYPE) == VT_VOID) + vtop--; + else + gfunc_return(&func_vt); + } + skip(';'); + /* jump unless last stmt in top-level block */ + if (tok != '}' || local_scope != 1) + rsym = gjmp(rsym); + nocode_wanted |= 0x20000000; + } else if (tok == TOK_BREAK) { + /* compute jump */ + if (!bsym) + tcc_error("cannot break"); + *bsym = gjmp(*bsym); + next(); + skip(';'); + nocode_wanted |= 0x20000000; + } else if (tok == TOK_CONTINUE) { + /* compute jump */ + if (!csym) + tcc_error("cannot continue"); + vla_sp_restore_root(); + *csym = gjmp(*csym); + next(); + skip(';'); + } else if (tok == TOK_FOR) { + int e; + int saved_nocode_wanted; + nocode_wanted &= ~0x20000000; + next(); + skip('('); + s = local_stack; + ++local_scope; + if (tok != ';') { + /* c99 for-loop init decl? */ + if (!decl0(VT_LOCAL, 1, NULL)) { + /* no, regular for-loop init expr */ + gexpr(); + vpop(); + } + } + skip(';'); + d = ind; + c = ind; + vla_sp_restore(); + a = 0; + b = 0; + if (tok != ';') { + gexpr(); + a = gvtst(1, 0); + } + skip(';'); + if (tok != ')') { + e = gjmp(0); + c = ind; + vla_sp_restore(); + gexpr(); + vpop(); + gjmp_addr(d); + gsym(e); + } + skip(')'); + saved_nocode_wanted = nocode_wanted; + block(&a, &b, 0); + nocode_wanted = saved_nocode_wanted; + gjmp_addr(c); + gsym(a); + gsym_addr(b, c); + --local_scope; + sym_pop(&local_stack, s, 0); + + } else + if (tok == TOK_DO) { + int saved_nocode_wanted; + nocode_wanted &= ~0x20000000; + next(); + a = 0; + b = 0; + d = ind; + vla_sp_restore(); + saved_nocode_wanted = nocode_wanted; + block(&a, &b, 0); + skip(TOK_WHILE); + skip('('); + gsym(b); + gexpr(); + c = gvtst(0, 0); + gsym_addr(c, d); + nocode_wanted = saved_nocode_wanted; + skip(')'); + gsym(a); + skip(';'); + } else + if (tok == TOK_SWITCH) { + struct switch_t *saved, sw; + int saved_nocode_wanted = nocode_wanted; + SValue switchval; + next(); + skip('('); + gexpr(); + skip(')'); + switchval = *vtop--; + a = 0; + b = gjmp(0); /* jump to first case */ + sw.p = NULL; sw.n = 0; sw.def_sym = 0; + saved = cur_switch; + cur_switch = &sw; + block(&a, csym, 0); + nocode_wanted = saved_nocode_wanted; + a = gjmp(a); /* add implicit break */ + /* case lookup */ + gsym(b); + qsort(sw.p, sw.n, sizeof(void*), case_cmp); + for (b = 1; b < sw.n; b++) + if (sw.p[b - 1]->v2 >= sw.p[b]->v1) + tcc_error("duplicate case value"); + /* Our switch table sorting is signed, so the compared + value needs to be as well when it's 64bit. */ + if ((switchval.type.t & VT_BTYPE) == VT_LLONG) + switchval.type.t &= ~VT_UNSIGNED; + vpushv(&switchval); + gcase(sw.p, sw.n, &a); + vpop(); + if (sw.def_sym) + gjmp_addr(sw.def_sym); + dynarray_reset(&sw.p, &sw.n); + cur_switch = saved; + /* break label */ + gsym(a); + } else + if (tok == TOK_CASE) { + struct case_t *cr = tcc_malloc(sizeof(struct case_t)); + if (!cur_switch) + expect("switch"); + nocode_wanted &= ~0x20000000; + next(); + cr->v1 = cr->v2 = expr_const64(); + if (gnu_ext && tok == TOK_DOTS) { + next(); + cr->v2 = expr_const64(); + if (cr->v2 < cr->v1) + tcc_warning("empty case range"); + } + cr->sym = ind; + dynarray_add(&cur_switch->p, &cur_switch->n, cr); + skip(':'); + is_expr = 0; + goto block_after_label; + } else + if (tok == TOK_DEFAULT) { + next(); + skip(':'); + if (!cur_switch) + expect("switch"); + if (cur_switch->def_sym) + tcc_error("too many 'default'"); + cur_switch->def_sym = ind; + is_expr = 0; + goto block_after_label; + } else + if (tok == TOK_GOTO) { + next(); + if (tok == '*' && gnu_ext) { + /* computed goto */ + next(); + gexpr(); + if ((vtop->type.t & VT_BTYPE) != VT_PTR) + expect("pointer"); + ggoto(); + } else if (tok >= TOK_UIDENT) { + s = label_find(tok); + /* put forward definition if needed */ + if (!s) { + s = label_push(&global_label_stack, tok, LABEL_FORWARD); + } else { + if (s->r == LABEL_DECLARED) + s->r = LABEL_FORWARD; + } + vla_sp_restore_root(); + if (s->r & LABEL_FORWARD) + s->jnext = gjmp(s->jnext); + else + gjmp_addr(s->jnext); + next(); + } else { + expect("label identifier"); + } + skip(';'); + } else if (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3) { + asm_instr(); + } else { + b = is_label(); + if (b) { + /* label case */ + next(); + s = label_find(b); + if (s) { + if (s->r == LABEL_DEFINED) + tcc_error("duplicate label '%s'", get_tok_str(s->v, NULL)); + gsym(s->jnext); + s->r = LABEL_DEFINED; + } else { + s = label_push(&global_label_stack, b, LABEL_DEFINED); + } + s->jnext = ind; + vla_sp_restore(); + /* we accept this, but it is a mistake */ + block_after_label: + nocode_wanted &= ~0x20000000; + if (tok == '}') { + tcc_warning("deprecated use of label at end of compound statement"); + } else { + if (is_expr) + vpop(); + block(bsym, csym, is_expr); + } + } else { + /* expression case */ + if (tok != ';') { + if (is_expr) { + vpop(); + gexpr(); + } else { + gexpr(); + vpop(); + } + } + skip(';'); + } + } +} + +/* This skips over a stream of tokens containing balanced {} and () + pairs, stopping at outer ',' ';' and '}' (or matching '}' if we started + with a '{'). If STR then allocates and stores the skipped tokens + in *STR. This doesn't check if () and {} are nested correctly, + i.e. "({)}" is accepted. */ +static void skip_or_save_block(TokenString **str) +{ + int braces = tok == '{'; + int level = 0; + if (str) + *str = tok_str_alloc(); + + while ((level > 0 || (tok != '}' && tok != ',' && tok != ';' && tok != ')'))) { + int t; + if (tok == TOK_EOF) { + if (str || level > 0) + tcc_error("unexpected end of file"); + else + break; + } + if (str) + tok_str_add_tok(*str); + t = tok; + next(); + if (t == '{' || t == '(') { + level++; + } else if (t == '}' || t == ')') { + level--; + if (level == 0 && braces && t == '}') + break; + } + } + if (str) { + tok_str_add(*str, -1); + tok_str_add(*str, 0); + } +} + +#define EXPR_CONST 1 +#define EXPR_ANY 2 + +static void parse_init_elem(int expr_type) +{ + int saved_global_expr; + switch(expr_type) { + case EXPR_CONST: + /* compound literals must be allocated globally in this case */ + saved_global_expr = global_expr; + global_expr = 1; + expr_const1(); + global_expr = saved_global_expr; + /* NOTE: symbols are accepted, as well as lvalue for anon symbols + (compound literals). */ + if (((vtop->r & (VT_VALMASK | VT_LVAL)) != VT_CONST + && ((vtop->r & (VT_SYM|VT_LVAL)) != (VT_SYM|VT_LVAL) + || vtop->sym->v < SYM_FIRST_ANOM)) +#ifdef TCC_TARGET_PE + || ((vtop->r & VT_SYM) && vtop->sym->a.dllimport) +#endif + ) + tcc_error("initializer element is not constant"); + break; + case EXPR_ANY: + expr_eq(); + break; + } +} + +/* put zeros for variable based init */ +static void init_putz(Section *sec, unsigned long c, int size) +{ + if (sec) { + /* nothing to do because globals are already set to zero */ + } else { + vpush_global_sym(&func_old_type, TOK_memset); + vseti(VT_LOCAL, c); +#ifdef TCC_TARGET_ARM + vpushs(size); + vpushi(0); +#else + vpushi(0); + vpushs(size); +#endif + gfunc_call(3); + } +} + +/* t is the array or struct type. c is the array or struct + address. cur_field is the pointer to the current + field, for arrays the 'c' member contains the current start + index. 'size_only' is true if only size info is needed (only used + in arrays). al contains the already initialized length of the + current container (starting at c). This returns the new length of that. */ +static int decl_designator(CType *type, Section *sec, unsigned long c, + Sym **cur_field, int size_only, int al) +{ + Sym *s, *f; + int index, index_last, align, l, nb_elems, elem_size; + unsigned long corig = c; + + elem_size = 0; + nb_elems = 1; + if (gnu_ext && (l = is_label()) != 0) + goto struct_field; + /* NOTE: we only support ranges for last designator */ + while (nb_elems == 1 && (tok == '[' || tok == '.')) { + if (tok == '[') { + if (!(type->t & VT_ARRAY)) + expect("array type"); + next(); + index = index_last = expr_const(); + if (tok == TOK_DOTS && gnu_ext) { + next(); + index_last = expr_const(); + } + skip(']'); + s = type->ref; + if (index < 0 || (s->c >= 0 && index_last >= s->c) || + index_last < index) + tcc_error("invalid index"); + if (cur_field) + (*cur_field)->c = index_last; + type = pointed_type(type); + elem_size = type_size(type, &align); + c += index * elem_size; + nb_elems = index_last - index + 1; + } else { + next(); + l = tok; + struct_field: + next(); + if ((type->t & VT_BTYPE) != VT_STRUCT) + expect("struct/union type"); + f = find_field(type, l); + if (!f) + expect("field"); + if (cur_field) + *cur_field = f; + type = &f->type; + c += f->c; + } + cur_field = NULL; + } + if (!cur_field) { + if (tok == '=') { + next(); + } else if (!gnu_ext) { + expect("="); + } + } else { + if (type->t & VT_ARRAY) { + index = (*cur_field)->c; + if (type->ref->c >= 0 && index >= type->ref->c) + tcc_error("index too large"); + type = pointed_type(type); + c += index * type_size(type, &align); + } else { + f = *cur_field; + while (f && (f->v & SYM_FIRST_ANOM) && (f->type.t & VT_BITFIELD)) + *cur_field = f = f->next; + if (!f) + tcc_error("too many field init"); + type = &f->type; + c += f->c; + } + } + /* must put zero in holes (note that doing it that way + ensures that it even works with designators) */ + if (!size_only && c - corig > al) + init_putz(sec, corig + al, c - corig - al); + decl_initializer(type, sec, c, 0, size_only); + + /* XXX: make it more general */ + if (!size_only && nb_elems > 1) { + unsigned long c_end; + uint8_t *src, *dst; + int i; + + if (!sec) { + vset(type, VT_LOCAL|VT_LVAL, c); + for (i = 1; i < nb_elems; i++) { + vset(type, VT_LOCAL|VT_LVAL, c + elem_size * i); + vswap(); + vstore(); + } + vpop(); + } else if (!NODATA_WANTED) { + c_end = c + nb_elems * elem_size; + if (c_end > sec->data_allocated) + section_realloc(sec, c_end); + src = sec->data + c; + dst = src; + for(i = 1; i < nb_elems; i++) { + dst += elem_size; + memcpy(dst, src, elem_size); + } + } + } + c += nb_elems * type_size(type, &align); + if (c - corig > al) + al = c - corig; + return al; +} + +/* store a value or an expression directly in global data or in local array */ +static void init_putv(CType *type, Section *sec, unsigned long c) +{ + int bt; + void *ptr; + CType dtype; + + dtype = *type; + dtype.t &= ~VT_CONSTANT; /* need to do that to avoid false warning */ + + if (sec) { + int size, align; + /* XXX: not portable */ + /* XXX: generate error if incorrect relocation */ + gen_assign_cast(&dtype); + bt = type->t & VT_BTYPE; + + if ((vtop->r & VT_SYM) + && bt != VT_PTR + && bt != VT_FUNC + && (bt != (PTR_SIZE == 8 ? VT_LLONG : VT_INT) + || (type->t & VT_BITFIELD)) + && !((vtop->r & VT_CONST) && vtop->sym->v >= SYM_FIRST_ANOM) + ) + tcc_error("initializer element is not computable at load time"); + + if (NODATA_WANTED) { + vtop--; + return; + } + + size = type_size(type, &align); + section_reserve(sec, c + size); + ptr = sec->data + c; + + /* XXX: make code faster ? */ + if ((vtop->r & (VT_SYM|VT_CONST)) == (VT_SYM|VT_CONST) && + vtop->sym->v >= SYM_FIRST_ANOM && + /* XXX This rejects compound literals like + '(void *){ptr}'. The problem is that '&sym' is + represented the same way, which would be ruled out + by the SYM_FIRST_ANOM check above, but also '"string"' + in 'char *p = "string"' is represented the same + with the type being VT_PTR and the symbol being an + anonymous one. That is, there's no difference in vtop + between '(void *){x}' and '&(void *){x}'. Ignore + pointer typed entities here. Hopefully no real code + will every use compound literals with scalar type. */ + (vtop->type.t & VT_BTYPE) != VT_PTR) { + /* These come from compound literals, memcpy stuff over. */ + Section *ssec; + ElfSym *esym; + ElfW_Rel *rel; + esym = elfsym(vtop->sym); + ssec = tcc_state->sections[esym->st_shndx]; + memmove (ptr, ssec->data + esym->st_value, size); + if (ssec->reloc) { + /* We need to copy over all memory contents, and that + includes relocations. Use the fact that relocs are + created it order, so look from the end of relocs + until we hit one before the copied region. */ + int num_relocs = ssec->reloc->data_offset / sizeof(*rel); + rel = (ElfW_Rel*)(ssec->reloc->data + ssec->reloc->data_offset); + while (num_relocs--) { + rel--; + if (rel->r_offset >= esym->st_value + size) + continue; + if (rel->r_offset < esym->st_value) + break; + /* Note: if the same fields are initialized multiple + times (possible with designators) then we possibly + add multiple relocations for the same offset here. + That would lead to wrong code, the last reloc needs + to win. We clean this up later after the whole + initializer is parsed. */ + put_elf_reloca(symtab_section, sec, + c + rel->r_offset - esym->st_value, + ELF64_R_TYPE(rel->r_info), + ELF64_R_SYM(rel->r_info), +#if PTR_SIZE == 8 + rel->r_addend +#else + 0 +#endif + ); + } + } + } else { + if (type->t & VT_BITFIELD) { + int bit_pos, bit_size, bits, n; + unsigned char *p, v, m; + bit_pos = BIT_POS(vtop->type.t); + bit_size = BIT_SIZE(vtop->type.t); + p = (unsigned char*)ptr + (bit_pos >> 3); + bit_pos &= 7, bits = 0; + while (bit_size) { + n = 8 - bit_pos; + if (n > bit_size) + n = bit_size; + v = vtop->c.i >> bits << bit_pos; + m = ((1 << n) - 1) << bit_pos; + *p = (*p & ~m) | (v & m); + bits += n, bit_size -= n, bit_pos = 0, ++p; + } + } else + switch(bt) { + /* XXX: when cross-compiling we assume that each type has the + same representation on host and target, which is likely to + be wrong in the case of long double */ + case VT_BOOL: + vtop->c.i = vtop->c.i != 0; + case VT_BYTE: + *(char *)ptr |= vtop->c.i; + break; + case VT_SHORT: + *(short *)ptr |= vtop->c.i; + break; + case VT_FLOAT: + *(float*)ptr = vtop->c.f; + break; + case VT_DOUBLE: + *(double *)ptr = vtop->c.d; + break; + case VT_LDOUBLE: +#if defined TCC_IS_NATIVE_387 + if (sizeof (long double) >= 10) /* zero pad ten-byte LD */ + memcpy(ptr, &vtop->c.ld, 10); +#ifdef __TINYC__ + else if (sizeof (long double) == sizeof (double)) + __asm__("fldl %1\nfstpt %0\n" : "=m" (*ptr) : "m" (vtop->c.ld)); +#endif + else if (vtop->c.ld == 0.0) + ; + else +#endif + if (sizeof(long double) == LDOUBLE_SIZE) + *(long double*)ptr = vtop->c.ld; + else if (sizeof(double) == LDOUBLE_SIZE) + *(double *)ptr = (double)vtop->c.ld; + else + tcc_error("can't cross compile long double constants"); + break; +#if PTR_SIZE != 8 + case VT_LLONG: + *(long long *)ptr |= vtop->c.i; + break; +#else + case VT_LLONG: +#endif + case VT_PTR: + { + addr_t val = vtop->c.i; +#if PTR_SIZE == 8 + if (vtop->r & VT_SYM) + greloca(sec, vtop->sym, c, R_DATA_PTR, val); + else + *(addr_t *)ptr |= val; +#else + if (vtop->r & VT_SYM) + greloc(sec, vtop->sym, c, R_DATA_PTR); + *(addr_t *)ptr |= val; +#endif + break; + } + default: + { + int val = vtop->c.i; +#if PTR_SIZE == 8 + if (vtop->r & VT_SYM) + greloca(sec, vtop->sym, c, R_DATA_PTR, val); + else + *(int *)ptr |= val; +#else + if (vtop->r & VT_SYM) + greloc(sec, vtop->sym, c, R_DATA_PTR); + *(int *)ptr |= val; +#endif + break; + } + } + } + vtop--; + } else { + vset(&dtype, VT_LOCAL|VT_LVAL, c); + vswap(); + vstore(); + vpop(); + } +} + +/* 't' contains the type and storage info. 'c' is the offset of the + object in section 'sec'. If 'sec' is NULL, it means stack based + allocation. 'first' is true if array '{' must be read (multi + dimension implicit array init handling). 'size_only' is true if + size only evaluation is wanted (only for arrays). */ +static void decl_initializer(CType *type, Section *sec, unsigned long c, + int first, int size_only) +{ + int len, n, no_oblock, nb, i; + int size1, align1; + int have_elem; + Sym *s, *f; + Sym indexsym; + CType *t1; + + /* If we currently are at an '}' or ',' we have read an initializer + element in one of our callers, and not yet consumed it. */ + have_elem = tok == '}' || tok == ','; + if (!have_elem && tok != '{' && + /* In case of strings we have special handling for arrays, so + don't consume them as initializer value (which would commit them + to some anonymous symbol). */ + tok != TOK_LSTR && tok != TOK_STR && + !size_only) { + parse_init_elem(!sec ? EXPR_ANY : EXPR_CONST); + have_elem = 1; + } + + if (have_elem && + !(type->t & VT_ARRAY) && + /* Use i_c_parameter_t, to strip toplevel qualifiers. + The source type might have VT_CONSTANT set, which is + of course assignable to non-const elements. */ + is_compatible_unqualified_types(type, &vtop->type)) { + init_putv(type, sec, c); + } else if (type->t & VT_ARRAY) { + s = type->ref; + n = s->c; + t1 = pointed_type(type); + size1 = type_size(t1, &align1); + + no_oblock = 1; + if ((first && tok != TOK_LSTR && tok != TOK_STR) || + tok == '{') { + if (tok != '{') + tcc_error("character array initializer must be a literal," + " optionally enclosed in braces"); + skip('{'); + no_oblock = 0; + } + + /* only parse strings here if correct type (otherwise: handle + them as ((w)char *) expressions */ + if ((tok == TOK_LSTR && +#ifdef TCC_TARGET_PE + (t1->t & VT_BTYPE) == VT_SHORT && (t1->t & VT_UNSIGNED) +#else + (t1->t & VT_BTYPE) == VT_INT +#endif + ) || (tok == TOK_STR && (t1->t & VT_BTYPE) == VT_BYTE)) { + len = 0; + while (tok == TOK_STR || tok == TOK_LSTR) { + int cstr_len, ch; + + /* compute maximum number of chars wanted */ + if (tok == TOK_STR) + cstr_len = tokc.str.size; + else + cstr_len = tokc.str.size / sizeof(nwchar_t); + cstr_len--; + nb = cstr_len; + if (n >= 0 && nb > (n - len)) + nb = n - len; + if (!size_only) { + if (cstr_len > nb) + tcc_warning("initializer-string for array is too long"); + /* in order to go faster for common case (char + string in global variable, we handle it + specifically */ + if (sec && tok == TOK_STR && size1 == 1) { + if (!NODATA_WANTED) + memcpy(sec->data + c + len, tokc.str.data, nb); + } else { + for(i=0;i<nb;i++) { + if (tok == TOK_STR) + ch = ((unsigned char *)tokc.str.data)[i]; + else + ch = ((nwchar_t *)tokc.str.data)[i]; + vpushi(ch); + init_putv(t1, sec, c + (len + i) * size1); + } + } + } + len += nb; + next(); + } + /* only add trailing zero if enough storage (no + warning in this case since it is standard) */ + if (n < 0 || len < n) { + if (!size_only) { + vpushi(0); + init_putv(t1, sec, c + (len * size1)); + } + len++; + } + len *= size1; + } else { + indexsym.c = 0; + f = &indexsym; + + do_init_list: + len = 0; + while (tok != '}' || have_elem) { + len = decl_designator(type, sec, c, &f, size_only, len); + have_elem = 0; + if (type->t & VT_ARRAY) { + ++indexsym.c; + /* special test for multi dimensional arrays (may not + be strictly correct if designators are used at the + same time) */ + if (no_oblock && len >= n*size1) + break; + } else { + if (s->type.t == VT_UNION) + f = NULL; + else + f = f->next; + if (no_oblock && f == NULL) + break; + } + + if (tok == '}') + break; + skip(','); + } + } + /* put zeros at the end */ + if (!size_only && len < n*size1) + init_putz(sec, c + len, n*size1 - len); + if (!no_oblock) + skip('}'); + /* patch type size if needed, which happens only for array types */ + if (n < 0) + s->c = size1 == 1 ? len : ((len + size1 - 1)/size1); + } else if ((type->t & VT_BTYPE) == VT_STRUCT) { + size1 = 1; + no_oblock = 1; + if (first || tok == '{') { + skip('{'); + no_oblock = 0; + } + s = type->ref; + f = s->next; + n = s->c; + goto do_init_list; + } else if (tok == '{') { + next(); + decl_initializer(type, sec, c, first, size_only); + skip('}'); + } else if (size_only) { + /* If we supported only ISO C we wouldn't have to accept calling + this on anything than an array size_only==1 (and even then + only on the outermost level, so no recursion would be needed), + because initializing a flex array member isn't supported. + But GNU C supports it, so we need to recurse even into + subfields of structs and arrays when size_only is set. */ + /* just skip expression */ + skip_or_save_block(NULL); + } else { + if (!have_elem) { + /* This should happen only when we haven't parsed + the init element above for fear of committing a + string constant to memory too early. */ + if (tok != TOK_STR && tok != TOK_LSTR) + expect("string constant"); + parse_init_elem(!sec ? EXPR_ANY : EXPR_CONST); + } + init_putv(type, sec, c); + } +} + +/* parse an initializer for type 't' if 'has_init' is non zero, and + allocate space in local or global data space ('r' is either + VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated + variable 'v' of scope 'scope' is declared before initializers + are parsed. If 'v' is zero, then a reference to the new object + is put in the value stack. If 'has_init' is 2, a special parsing + is done to handle string constants. */ +static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r, + int has_init, int v, int scope) +{ + int size, align, addr; + TokenString *init_str = NULL; + + Section *sec; + Sym *flexible_array; + Sym *sym = NULL; + int saved_nocode_wanted = nocode_wanted; +#ifdef CONFIG_TCC_BCHECK + int bcheck = tcc_state->do_bounds_check && !NODATA_WANTED; +#endif + + if (type->t & VT_STATIC) + nocode_wanted |= NODATA_WANTED ? 0x40000000 : 0x80000000; + + flexible_array = NULL; + if ((type->t & VT_BTYPE) == VT_STRUCT) { + Sym *field = type->ref->next; + if (field) { + while (field->next) + field = field->next; + if (field->type.t & VT_ARRAY && field->type.ref->c < 0) + flexible_array = field; + } + } + + size = type_size(type, &align); + /* If unknown size, we must evaluate it before + evaluating initializers because + initializers can generate global data too + (e.g. string pointers or ISOC99 compound + literals). It also simplifies local + initializers handling */ + if (size < 0 || (flexible_array && has_init)) { + if (!has_init) + tcc_error("unknown type size"); + /* get all init string */ + if (has_init == 2) { + init_str = tok_str_alloc(); + /* only get strings */ + while (tok == TOK_STR || tok == TOK_LSTR) { + tok_str_add_tok(init_str); + next(); + } + tok_str_add(init_str, -1); + tok_str_add(init_str, 0); + } else { + skip_or_save_block(&init_str); + } + unget_tok(0); + + /* compute size */ + begin_macro(init_str, 1); + next(); + decl_initializer(type, NULL, 0, 1, 1); + /* prepare second initializer parsing */ + macro_ptr = init_str->str; + next(); + + /* if still unknown size, error */ + size = type_size(type, &align); + if (size < 0) + tcc_error("unknown type size"); + } + /* If there's a flex member and it was used in the initializer + adjust size. */ + if (flexible_array && + flexible_array->type.ref->c > 0) + size += flexible_array->type.ref->c + * pointed_size(&flexible_array->type); + /* take into account specified alignment if bigger */ + if (ad->a.aligned) { + int speca = 1 << (ad->a.aligned - 1); + if (speca > align) + align = speca; + } else if (ad->a.packed) { + align = 1; + } + + if (NODATA_WANTED) + size = 0, align = 1; + + if ((r & VT_VALMASK) == VT_LOCAL) { + sec = NULL; +#ifdef CONFIG_TCC_BCHECK + if (bcheck && (type->t & VT_ARRAY)) { + loc--; + } +#endif + loc = (loc - size) & -align; + addr = loc; +#ifdef CONFIG_TCC_BCHECK + /* handles bounds */ + /* XXX: currently, since we do only one pass, we cannot track + '&' operators, so we add only arrays */ + if (bcheck && (type->t & VT_ARRAY)) { + addr_t *bounds_ptr; + /* add padding between regions */ + loc--; + /* then add local bound info */ + bounds_ptr = section_ptr_add(lbounds_section, 2 * sizeof(addr_t)); + bounds_ptr[0] = addr; + bounds_ptr[1] = size; + } +#endif + if (v) { + /* local variable */ +#ifdef CONFIG_TCC_ASM + if (ad->asm_label) { + int reg = asm_parse_regvar(ad->asm_label); + if (reg >= 0) + r = (r & ~VT_VALMASK) | reg; + } +#endif + sym = sym_push(v, type, r, addr); + sym->a = ad->a; + } else { + /* push local reference */ + vset(type, r, addr); + } + } else { + if (v && scope == VT_CONST) { + /* see if the symbol was already defined */ + sym = sym_find(v); + if (sym) { + patch_storage(sym, ad, type); + /* we accept several definitions of the same global variable. */ + if (!has_init && sym->c && elfsym(sym)->st_shndx != SHN_UNDEF) + goto no_alloc; + } + } + + /* allocate symbol in corresponding section */ + sec = ad->section; + if (!sec) { + if (has_init) + sec = data_section; + else if (tcc_state->nocommon) + sec = bss_section; + } + + if (sec) { + addr = section_add(sec, size, align); +#ifdef CONFIG_TCC_BCHECK + /* add padding if bound check */ + if (bcheck) + section_add(sec, 1, 1); +#endif + } else { + addr = align; /* SHN_COMMON is special, symbol value is align */ + sec = common_section; + } + + if (v) { + if (!sym) { + sym = sym_push(v, type, r | VT_SYM, 0); + patch_storage(sym, ad, NULL); + } + /* Local statics have a scope until now (for + warnings), remove it here. */ + sym->sym_scope = 0; + /* update symbol definition */ + put_extern_sym(sym, sec, addr, size); + } else { + /* push global reference */ + sym = get_sym_ref(type, sec, addr, size); + vpushsym(type, sym); + vtop->r |= r; + } + +#ifdef CONFIG_TCC_BCHECK + /* handles bounds now because the symbol must be defined + before for the relocation */ + if (bcheck) { + addr_t *bounds_ptr; + + greloca(bounds_section, sym, bounds_section->data_offset, R_DATA_PTR, 0); + /* then add global bound info */ + bounds_ptr = section_ptr_add(bounds_section, 2 * sizeof(addr_t)); + bounds_ptr[0] = 0; /* relocated */ + bounds_ptr[1] = size; + } +#endif + } + + if (type->t & VT_VLA) { + int a; + + if (NODATA_WANTED) + goto no_alloc; + + /* save current stack pointer */ + if (vlas_in_scope == 0) { + if (vla_sp_root_loc == -1) + vla_sp_root_loc = (loc -= PTR_SIZE); + gen_vla_sp_save(vla_sp_root_loc); + } + + vla_runtime_type_size(type, &a); + gen_vla_alloc(type, a); +#if defined TCC_TARGET_PE && defined TCC_TARGET_X86_64 + /* on _WIN64, because of the function args scratch area, the + result of alloca differs from RSP and is returned in RAX. */ + gen_vla_result(addr), addr = (loc -= PTR_SIZE); +#endif + gen_vla_sp_save(addr); + vla_sp_loc = addr; + vlas_in_scope++; + + } else if (has_init) { + size_t oldreloc_offset = 0; + if (sec && sec->reloc) + oldreloc_offset = sec->reloc->data_offset; + decl_initializer(type, sec, addr, 1, 0); + if (sec && sec->reloc) + squeeze_multi_relocs(sec, oldreloc_offset); + /* patch flexible array member size back to -1, */ + /* for possible subsequent similar declarations */ + if (flexible_array) + flexible_array->type.ref->c = -1; + } + + no_alloc: + /* restore parse state if needed */ + if (init_str) { + end_macro(); + next(); + } + + nocode_wanted = saved_nocode_wanted; +} + +/* parse a function defined by symbol 'sym' and generate its code in + 'cur_text_section' */ +static void gen_function(Sym *sym) +{ + nocode_wanted = 0; + ind = cur_text_section->data_offset; + /* NOTE: we patch the symbol size later */ + put_extern_sym(sym, cur_text_section, ind, 0); + funcname = get_tok_str(sym->v, NULL); + func_ind = ind; + /* Initialize VLA state */ + vla_sp_loc = -1; + vla_sp_root_loc = -1; + /* put debug symbol */ + tcc_debug_funcstart(tcc_state, sym); + /* push a dummy symbol to enable local sym storage */ + sym_push2(&local_stack, SYM_FIELD, 0, 0); + local_scope = 1; /* for function parameters */ + gfunc_prolog(&sym->type); + local_scope = 0; + rsym = 0; + block(NULL, NULL, 0); + nocode_wanted = 0; + gsym(rsym); + gfunc_epilog(); + cur_text_section->data_offset = ind; + label_pop(&global_label_stack, NULL, 0); + /* reset local stack */ + local_scope = 0; + sym_pop(&local_stack, NULL, 0); + /* end of function */ + /* patch symbol size */ + elfsym(sym)->st_size = ind - func_ind; + tcc_debug_funcend(tcc_state, ind - func_ind); + /* It's better to crash than to generate wrong code */ + cur_text_section = NULL; + funcname = ""; /* for safety */ + func_vt.t = VT_VOID; /* for safety */ + func_var = 0; /* for safety */ + ind = 0; /* for safety */ + nocode_wanted = 0x80000000; + check_vstack(); +} + +static void gen_inline_functions(TCCState *s) +{ + Sym *sym; + int inline_generated, i, ln; + struct InlineFunc *fn; + + ln = file->line_num; + /* iterate while inline function are referenced */ + do { + inline_generated = 0; + for (i = 0; i < s->nb_inline_fns; ++i) { + fn = s->inline_fns[i]; + sym = fn->sym; + if (sym && sym->c) { + /* the function was used: generate its code and + convert it to a normal function */ + fn->sym = NULL; + if (file) + pstrcpy(file->filename, sizeof file->filename, fn->filename); + sym->type.t &= ~VT_INLINE; + + begin_macro(fn->func_str, 1); + next(); + cur_text_section = text_section; + gen_function(sym); + end_macro(); + + inline_generated = 1; + } + } + } while (inline_generated); + file->line_num = ln; +} + +ST_FUNC void free_inline_functions(TCCState *s) +{ + int i; + /* free tokens of unused inline functions */ + for (i = 0; i < s->nb_inline_fns; ++i) { + struct InlineFunc *fn = s->inline_fns[i]; + if (fn->sym) + tok_str_free(fn->func_str); + } + dynarray_reset(&s->inline_fns, &s->nb_inline_fns); +} + +/* 'l' is VT_LOCAL or VT_CONST to define default storage type, or VT_CMP + if parsing old style parameter decl list (and FUNC_SYM is set then) */ +static int decl0(int l, int is_for_loop_init, Sym *func_sym) +{ + int v, has_init, r; + CType type, btype; + Sym *sym; + AttributeDef ad; + + while (1) { + if (!parse_btype(&btype, &ad)) { + if (is_for_loop_init) + return 0; + /* skip redundant ';' if not in old parameter decl scope */ + if (tok == ';' && l != VT_CMP) { + next(); + continue; + } + if (l != VT_CONST) + break; + if (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3) { + /* global asm block */ + asm_global_instr(); + continue; + } + if (tok >= TOK_UIDENT) { + /* special test for old K&R protos without explicit int + type. Only accepted when defining global data */ + btype.t = VT_INT; + } else { + if (tok != TOK_EOF) + expect("declaration"); + break; + } + } + if (tok == ';') { + if ((btype.t & VT_BTYPE) == VT_STRUCT) { + int v = btype.ref->v; + if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) >= SYM_FIRST_ANOM) + tcc_warning("unnamed struct/union that defines no instances"); + next(); + continue; + } + if (IS_ENUM(btype.t)) { + next(); + continue; + } + } + while (1) { /* iterate thru each declaration */ + type = btype; + /* If the base type itself was an array type of unspecified + size (like in 'typedef int arr[]; arr x = {1};') then + we will overwrite the unknown size by the real one for + this decl. We need to unshare the ref symbol holding + that size. */ + if ((type.t & VT_ARRAY) && type.ref->c < 0) { + type.ref = sym_push(SYM_FIELD, &type.ref->type, 0, type.ref->c); + } + type_decl(&type, &ad, &v, TYPE_DIRECT); +#if 0 + { + char buf[500]; + type_to_str(buf, sizeof(buf), &type, get_tok_str(v, NULL)); + printf("type = '%s'\n", buf); + } +#endif + if ((type.t & VT_BTYPE) == VT_FUNC) { + if ((type.t & VT_STATIC) && (l == VT_LOCAL)) { + tcc_error("function without file scope cannot be static"); + } + /* if old style function prototype, we accept a + declaration list */ + sym = type.ref; + if (sym->f.func_type == FUNC_OLD && l == VT_CONST) + decl0(VT_CMP, 0, sym); + } + + if (gnu_ext && (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3)) { + ad.asm_label = asm_label_instr(); + /* parse one last attribute list, after asm label */ + parse_attribute(&ad); + if (tok == '{') + expect(";"); + } + +#ifdef TCC_TARGET_PE + if (ad.a.dllimport || ad.a.dllexport) { + if (type.t & (VT_STATIC|VT_TYPEDEF)) + tcc_error("cannot have dll linkage with static or typedef"); + if (ad.a.dllimport) { + if ((type.t & VT_BTYPE) == VT_FUNC) + ad.a.dllimport = 0; + else + type.t |= VT_EXTERN; + } + } +#endif + if (tok == '{') { + if (l != VT_CONST) + tcc_error("cannot use local functions"); + if ((type.t & VT_BTYPE) != VT_FUNC) + expect("function definition"); + + /* reject abstract declarators in function definition + make old style params without decl have int type */ + sym = type.ref; + while ((sym = sym->next) != NULL) { + if (!(sym->v & ~SYM_FIELD)) + expect("identifier"); + if (sym->type.t == VT_VOID) + sym->type = int_type; + } + + /* XXX: cannot do better now: convert extern line to static inline */ + if ((type.t & (VT_EXTERN | VT_INLINE)) == (VT_EXTERN | VT_INLINE)) + type.t = (type.t & ~VT_EXTERN) | VT_STATIC; + + /* put function symbol */ + sym = external_global_sym(v, &type, 0); + type.t &= ~VT_EXTERN; + patch_storage(sym, &ad, &type); + + /* static inline functions are just recorded as a kind + of macro. Their code will be emitted at the end of + the compilation unit only if they are used */ + if ((type.t & (VT_INLINE | VT_STATIC)) == + (VT_INLINE | VT_STATIC)) { + struct InlineFunc *fn; + const char *filename; + + filename = file ? file->filename : ""; + fn = tcc_malloc(sizeof *fn + strlen(filename)); + strcpy(fn->filename, filename); + fn->sym = sym; + skip_or_save_block(&fn->func_str); + dynarray_add(&tcc_state->inline_fns, + &tcc_state->nb_inline_fns, fn); + } else { + /* compute text section */ + cur_text_section = ad.section; + if (!cur_text_section) + cur_text_section = text_section; + gen_function(sym); + } + break; + } else { + if (l == VT_CMP) { + /* find parameter in function parameter list */ + for (sym = func_sym->next; sym; sym = sym->next) + if ((sym->v & ~SYM_FIELD) == v) + goto found; + tcc_error("declaration for parameter '%s' but no such parameter", + get_tok_str(v, NULL)); +found: + if (type.t & VT_STORAGE) /* 'register' is okay */ + tcc_error("storage class specified for '%s'", + get_tok_str(v, NULL)); + if (sym->type.t != VT_VOID) + tcc_error("redefinition of parameter '%s'", + get_tok_str(v, NULL)); + convert_parameter_type(&type); + sym->type = type; + } else if (type.t & VT_TYPEDEF) { + /* save typedefed type */ + /* XXX: test storage specifiers ? */ + sym = sym_find(v); + if (sym && sym->sym_scope == local_scope) { + if (!is_compatible_types(&sym->type, &type) + || !(sym->type.t & VT_TYPEDEF)) + tcc_error("incompatible redefinition of '%s'", + get_tok_str(v, NULL)); + sym->type = type; + } else { + sym = sym_push(v, &type, 0, 0); + } + sym->a = ad.a; + sym->f = ad.f; + } else { + r = 0; + if ((type.t & VT_BTYPE) == VT_FUNC) { + /* external function definition */ + /* specific case for func_call attribute */ + type.ref->f = ad.f; + } else if (!(type.t & VT_ARRAY)) { + /* not lvalue if array */ + r |= lvalue_type(type.t); + } + has_init = (tok == '='); + if (has_init && (type.t & VT_VLA)) + tcc_error("variable length array cannot be initialized"); + if (((type.t & VT_EXTERN) && (!has_init || l != VT_CONST)) || + ((type.t & VT_BTYPE) == VT_FUNC) || + ((type.t & VT_ARRAY) && (type.t & VT_STATIC) && + !has_init && l == VT_CONST && type.ref->c < 0)) { + /* external variable or function */ + /* NOTE: as GCC, uninitialized global static + arrays of null size are considered as + extern */ + type.t |= VT_EXTERN; + sym = external_sym(v, &type, r, &ad); + if (ad.alias_target) { + ElfSym *esym; + Sym *alias_target; + alias_target = sym_find(ad.alias_target); + esym = elfsym(alias_target); + if (!esym) + tcc_error("unsupported forward __alias__ attribute"); + /* Local statics have a scope until now (for + warnings), remove it here. */ + sym->sym_scope = 0; + put_extern_sym2(sym, esym->st_shndx, esym->st_value, esym->st_size, 0); + } + } else { + if (type.t & VT_STATIC) + r |= VT_CONST; + else + r |= l; + if (has_init) + next(); + else if (l == VT_CONST) + /* uninitialized global variables may be overridden */ + type.t |= VT_EXTERN; + decl_initializer_alloc(&type, &ad, r, has_init, v, l); + } + } + if (tok != ',') { + if (is_for_loop_init) + return 1; + skip(';'); + break; + } + next(); + } + ad.a.aligned = 0; + } + } + return 0; +} + +static void decl(int l) +{ + decl0(l, 0, NULL); +} + +/* ------------------------------------------------------------------------- */ |