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typedef struct {
FILE *outc;
unsigned long ident_counter;
ParsedFile *file;
Block *block;
Identifier main_ident;
} CGenerator;
static void cgen_create(CGenerator *g, FILE *out, Identifiers *ids) {
g->outc = out;
g->ident_counter = 0;
g->main_ident = ident_get(ids, "main");
}
static void cgen_block_enter(CGenerator *g, Block *b) {
g->block = b;
Statement *stmts;
if (b == NULL) {
stmts = g->file->stmts;
} else {
stmts = b->stmts;
}
block_enter(b, stmts);
}
static void cgen_block_exit(CGenerator *g, Block *into) {
Block *b = g->block;
Statement *stmts;
if (b == NULL) {
stmts = g->file->stmts;
} else {
stmts = b->stmts;
}
block_exit(b, stmts);
g->block = into;
}
static inline FILE *cgen_writing_to(CGenerator *g) {
return g->outc; /* for now */
}
static void cgen_write(CGenerator *g, const char *fmt, ...) {
va_list args;
va_start(args, fmt);
vfprintf(cgen_writing_to(g), fmt, args);
va_end(args);
}
static void cgen_nl(CGenerator *g) {
fprintf(cgen_writing_to(g), "\n");
}
/* should declaration be a direct function declaration C (as opposed to using a function pointer or not being a function) */
static bool cgen_is_fn_direct(CGenerator *g, Declaration *d) {
return g->block == NULL && (d->flags & DECL_FLAG_HAS_EXPR) && d->expr.kind == EXPR_FN && arr_len(d->idents) == 1;
}
static void cgen_ident(CGenerator *g, Identifier i) {
if (i == g->main_ident) {
/* don't conflict with C's main! */
cgen_write(g, "main__");
} else {
fprint_ident(cgen_writing_to(g), i);
}
}
static bool cgen_type_post(CGenerator *g, Type *t, Location where);
static bool cgen_type_pre(CGenerator *g, Type *t, Location where) {
switch (t->kind) {
case TYPE_BUILTIN:
switch (t->builtin) {
case BUILTIN_I8: cgen_write(g, "i8"); break;
case BUILTIN_I16: cgen_write(g, "i16"); break;
case BUILTIN_I32: cgen_write(g, "i32"); break;
case BUILTIN_I64: cgen_write(g, "i64"); break;
case BUILTIN_U8: cgen_write(g, "u8"); break;
case BUILTIN_U16: cgen_write(g, "u16"); break;
case BUILTIN_U32: cgen_write(g, "u32"); break;
case BUILTIN_U64: cgen_write(g, "u64"); break;
case BUILTIN_CHAR: cgen_write(g, "char"); break;
case BUILTIN_BOOL: cgen_write(g, "bool"); break;
case BUILTIN_F32: cgen_write(g, "f32"); break;
case BUILTIN_F64: cgen_write(g, "f64"); break;
} break;
case TYPE_PTR:
if (!cgen_type_pre(g, t->ptr.of, where))
return false;
cgen_write(g, "(*");
break;
case TYPE_ARR:
if (!cgen_type_pre(g, t->arr.of, where))
return false;
cgen_write(g, "(");
break;
case TYPE_FN:
if (!cgen_type_pre(g, &t->fn.types[0], where))
return false;
cgen_write(g, " (*");
break;
case TYPE_VOID: cgen_write(g, "void"); break;
case TYPE_UNKNOWN:
err_print(t->where, "Can't determine type.");
return false;
case TYPE_TUPLE:
/* We should never try to generate a tuple */
assert(0);
return false;
}
return true;
}
static bool cgen_type_post(CGenerator *g, Type *t, Location where) {
switch (t->kind) {
case TYPE_PTR:
cgen_write(g, ")");
if (!cgen_type_post(g, t->ptr.of, where))
return false;
break;
case TYPE_ARR:
cgen_write(g, "[%lu])", (unsigned long)t->arr.n);
if (!cgen_type_post(g, t->arr.of, where))
return false;
break;
case TYPE_FN: {
cgen_write(g, ")(");
for (size_t i = 1; i < arr_len(t->fn.types); i++) {
if (i != 1)
cgen_write(g, ", ");
if (!cgen_type_pre(g, &t->fn.types[i], where))
return false;
if (!cgen_type_post(g, &t->fn.types[i], where))
return false;
}
cgen_write(g, ")");
if (!cgen_type_post(g, &t->fn.types[0], where))
return false;
} break;
case TYPE_BUILTIN:
case TYPE_VOID:
case TYPE_UNKNOWN:
case TYPE_TUPLE:
break;
}
return true;
}
static bool cgen_fn_header(CGenerator *g, FnExpr *f, Location where) {
if (!cgen_type_pre(g, &f->ret_type, where)) return false;
cgen_write(g, " ");
if (f->c.name) {
cgen_ident(g, f->c.name);
} else {
/* TODO */
}
if (!cgen_type_post(g, &f->ret_type, where)) return false;
cgen_write(g, "(");
arr_foreach(f->params, Declaration, d) {
arr_foreach(d->idents, Identifier, i) {
if (!cgen_type_pre(g, &d->type, where))
return false;
cgen_write(g, " ");
cgen_ident(g, *i);
if (!cgen_type_post(g, &d->type, where))
return false;
}
}
cgen_write(g, ")");
return true;
}
static bool cgen_expr(CGenerator *g, Expression *e) {
switch (e->kind) {
case EXPR_LITERAL_FLOAT:
cgen_write(g, "%f", e->floatl); /* TODO(eventually): better precision? */
break;
case EXPR_LITERAL_INT:
cgen_write(g, UINTEGER_FMT, e->intl);
break;
case EXPR_LITERAL_STR: {
size_t c;
cgen_write(g, "\"");
for (c = 0; c < e->strl.len; c++) {
cgen_write(g, "\\x%x", e->strl.str[c]);
}
cgen_write(g, "\"");
} break;
case EXPR_LITERAL_BOOL:
cgen_write(g, e->booll ? "true" : "false");
break;
case EXPR_LITERAL_CHAR:
cgen_write(g, "((char)%d)", e->charl);
break;
case EXPR_IDENT:
cgen_ident(g, e->ident);
break;
case EXPR_UNARY_OP: {
const char *s = "";
switch (e->unary.op) {
case UNARY_MINUS:
s = "-"; break;
case UNARY_DEREF:
s = "*"; break;
case UNARY_ADDRESS:
s = "&"; break;
case UNARY_NOT:
s = "!"; break;
case UNARY_DEL:
s = "free("; break;
}
cgen_write(g, s);
if (!cgen_expr(g, e->unary.of))
return false;
if (e->unary.op == UNARY_DEL)
cgen_write(g, ")");
} break;
}
return true;
}
static bool cgen_decl(CGenerator *g, Declaration *d) {
if (cgen_is_fn_direct(g, d)) {
if (!cgen_fn_header(g, &d->expr.fn, d->where))
return false;
cgen_write(g, " {");
cgen_nl(g);
cgen_write(g, "}");
cgen_nl(g);
cgen_nl(g);
} else if (d->flags & DECL_FLAG_CONST) {
/* TODO */
} else {
arr_foreach(d->idents, Identifier, i) {
if (!cgen_type_pre(g, &d->type, d->where)) return false;
cgen_write(g, " ");
cgen_ident(g, *i);
if (!cgen_type_post(g, &d->type, d->where)) return false;
if (g->block == NULL) {
/* repeat expression for each ident iff we are in global scope */
cgen_write(g, " = ");
if (!cgen_expr(g, &d->expr))
return false;
}
cgen_write(g, "; ");
}
if (g->block != NULL) {
arr_foreach(d->idents, Identifier, i) {
cgen_ident(g, *i);
cgen_write(g, " = ");
if (!cgen_expr(g, &d->expr))
return false;
}
}
cgen_nl(g);
}
return true;
}
static bool cgen_stmt(CGenerator *g, Statement *s) {
switch (s->kind) {
case STMT_DECL:
if (!cgen_decl(g, &s->decl)) return false;
break;
case STMT_EXPR:
if (!cgen_expr(g, &s->expr)) return false;
break;
case STMT_RET:
/* TODO */
break;
}
return true;
}
static bool cgen_decls_file(CGenerator *g, ParsedFile *f);
static bool cgen_file(CGenerator *g, ParsedFile *f) {
g->file = f;
cgen_write(g, "#include <stdint.h>\n"
"typedef int8_t i8;\n"
"typedef int16_t i16;\n"
"typedef int32_t i32;\n"
"typedef int64_t i64;\n"
"typedef uint8_t u8;\n"
"typedef uint16_t u16;\n"
"typedef uint32_t u32;\n"
"typedef uint64_t u64;\n"
"typedef float f32;\n"
"typedef double f64;\n"
"typedef unsigned char bool;\n"
"#define false ((bool)0)\n"
"#define true ((bool)1)\n\n\n");
cgen_block_enter(g, NULL);
if (!cgen_decls_file(g, f))
return false;
cgen_write(g, "/* code */\n");
cgen_block_exit(g, NULL);
cgen_write(g, "int main() {\n\tmain__();\n\treturn 0;\n}\n\n");
arr_foreach(f->stmts, Statement, s)
if (!cgen_stmt(g, s))
return false;
return true;
}
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