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/* figures out types and writes function prototypes */
/* TODO: check ferror */
typedef enum {
CGEN_WRITING_TO_H,
CGEN_WRITING_TO_C
} CGenWritingTo;
typedef struct {
FILE *c_out;
FILE *h_out;
unsigned long anon_fn_count;
Block *block;
int indent_level;
bool indent_next; /* should the next thing written be indented? */
CGenWritingTo writing_to;
} CGenerator;
static FILE *cgen_writing_to(CGenerator *g) {
switch (g->writing_to) {
case CGEN_WRITING_TO_H:
return g->h_out;
case CGEN_WRITING_TO_C:
return g->c_out;
}
assert(0);
return NULL;
}
static void cgen_vwrite(CGenerator *g, const char *fmt, va_list args) {
if (g->indent_next) {
for (int i = 0; i < g->indent_level; i++)
fprintf(cgen_writing_to(g), "\t");
g->indent_next = false;
}
vfprintf(cgen_writing_to(g), fmt, args);
}
static void cgen_write(CGenerator *g, const char *fmt, ...) {
va_list args;
va_start(args, fmt);
cgen_vwrite(g, fmt, args);
va_end(args);
}
/* Used to write an UNNECESSARY space */
static void cgen_write_space(CGenerator *g) {
cgen_write(g, " ");
}
/* Used to write something followed by an UNNECESSARY newline */
static void cgen_writeln(CGenerator *g, const char *fmt, ...) {
va_list args;
va_start(args, fmt);
cgen_vwrite(g, fmt, args);
va_end(args);
cgen_write(g, "\n");
g->indent_next = true;
}
static void cgen_write_comment(CGenerator *g, const char *fmt, ...) {
cgen_write(g, "/* ");
va_list args;
va_start(args, fmt);
cgen_vwrite(g, fmt, args);
va_end(args);
cgen_write(g, " */");
}
static void cgen_write_line_comment(CGenerator *g, const char *fmt, ...) {
/* could switch to // for c99 */
cgen_write(g, "/* ");
va_list args;
va_start(args, fmt);
cgen_vwrite(g, fmt, args);
va_end(args);
cgen_write(g, " */\n");
}
static void cgen_create(CGenerator *g, FILE *c_out, FILE *h_out, const char *h_filename) {
g->c_out = c_out;
g->h_out = h_out;
g->anon_fn_count = 0;
g->indent_level = 0;
g->block = NULL;
g->indent_next = true;
g->writing_to = CGEN_WRITING_TO_H;
cgen_write(g, "#include <stdint.h>\n");
g->writing_to = CGEN_WRITING_TO_C;
cgen_write(g, "#include \"%s\"\n", h_filename);
cgen_writeln(g, ""); /* extra newline between includes and code */
}
static void cgen_ident(CGenerator *g, Identifier i) {
fprint_ident(cgen_writing_to(g), i);
}
static const char *builtin_type_to_str(BuiltinType b) {
/* TODO: make this return int/long/etc. if stdint.h is not available */
switch (b) {
case BUILTIN_INT: return "int64_t";
case BUILTIN_I8: return "int8_t";
case BUILTIN_I16: return "int16_t";
case BUILTIN_I32: return "int32_t";
case BUILTIN_I64: return "int64_t";
case BUILTIN_U8: return "uint8_t";
case BUILTIN_U16: return "uint16_t";
case BUILTIN_U32: return "uint32_t";
case BUILTIN_U64: return "uint64_t";
case BUILTIN_FLOAT: return "float";
case BUILTIN_DOUBLE: return "double";
case BUILTIN_TYPE_COUNT: break;
}
assert(0);
return NULL;
}
/* NOTE: this will eventually be split into two functions when functions/arrays are added */
static bool cgen_type(CGenerator *g, Type *t) {
switch (t->kind) {
case TYPE_VOID:
cgen_write(g, "void");
break;
case TYPE_BUILTIN:
cgen_write(g, "%s", builtin_type_to_str(t->builtin));
break;
}
return true;
}
static void cgen_fn_name(CGenerator *g, FnExpr *f) {
if (f->name)
cgen_ident(g, f->name);
else
cgen_write(g, "a___");
if (f->id != 0)
cgen_write(g, "%lu", f->id);
}
static bool cgen_fn_header(CGenerator *g, FnExpr *f) {
CGenWritingTo writing_to_before = g->writing_to;
if (ident_eq_str(f->name, "main")) {
/* don't use actual main function */
cgen_write(g, "void main__(void)");
return true;
}
if (!f->name || g->block != NULL) {
cgen_write(g, "static "); /* anonymous functions only exist in this translation unit */
}
if (!cgen_type(g, &f->ret_type)) return false;
cgen_write(g, " ");
cgen_fn_name(g, f);
cgen_write(g, "(");
arr_foreach(&f->params, Param, p) {
if (p != f->params.data) {
cgen_write(g, ",");
cgen_write_space(g);
}
if (!cgen_type(g, &p->type))
return false;
cgen_write(g, " ");
cgen_ident(g, p->name);
}
cgen_write(g, ")");
g->writing_to = writing_to_before;
return true;
}
static bool cgen_block_enter(CGenerator *g, Block *b) {
bool ret = true;
g->block = b;
arr_foreach(&b->stmts, Statement, stmt) {
if (stmt->kind == STMT_DECL) {
Declaration *decl = &stmt->decl;
arr_foreach(&decl->idents, Identifier, ident) {
Array *decls = &(*ident)->decls;
if (decls->len) {
/* check that it hasn't been declared in this block */
IdentDecl *prev = decls->last;
if (prev->scope == b) {
err_print(decl->where, "Re-declaration of identifier in the same block.");
info_print(prev->decl->where, "Previous declaration was here.");
ret = false;
continue;
}
} else {
/* array not initialized yet */
arr_create(&(*ident)->decls, sizeof(IdentDecl));
}
if (infer_decl(decl)) {
IdentDecl *ident_decl = arr_add(decls);
ident_decl->decl = decl;
ident_decl->scope = b;
} else {
ret = false;
}
}
}
}
return ret;
}
static bool cgen_block_exit(CGenerator *g, Block *into) {
/* OPTIM: figure out some way of not re-iterating over everything */
bool ret = true;
Block *b = g->block;
g->block = into;
arr_foreach(&b->stmts, Statement, stmt) {
if (stmt->kind == STMT_DECL) {
Declaration *decl = &stmt->decl;
arr_foreach(&decl->idents, Identifier, ident) {
Array *decls = &(*ident)->decls;
assert(decls->item_sz);
IdentDecl *last_decl = decls->last;
if (last_decl->scope == b) {
arr_remove_last(decls); /* remove that declaration */
}
}
}
}
return ret;
}
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