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static bool cgen_expr(CGenerator *g, Expression *e) {
switch (e->kind) {
case EXPR_INT_LITERAL:
cgen_write(g, "%lld", e->intl);
break;
case EXPR_FLOAT_LITERAL:
/* TODO: more precision */
cgen_write(g, "%f", (double)e->floatl);
break;
case EXPR_STR_LITERAL:
cgen_write(g, "\"");
/* OPTIM: Maybe don't use i? this will probably be optimized by the compiler though... */
for (size_t i = 0; i < e->strl.len; i++) {
/* TODO: Print ordinary characters nicely */
cgen_write(g, "\\x%02x", e->strl.str[i]);
}
cgen_write(g, "\"");
break;
case EXPR_IDENT:
if (!cgen_ident(g, e->ident, &e->where)) return false;
break;
case EXPR_BINARY_OP:
cgen_write(g, "(");
if (!cgen_expr(g, e->binary.lhs)) return false;
switch (e->binary.op) {
case BINARY_PLUS:
cgen_write(g, "+");
break;
case BINARY_MINUS:
cgen_write(g, "-");
break;
case BINARY_SET:
cgen_write(g, "=");
break;
case BINARY_AT_INDEX:
cgen_write(g, "[");
break;
case BINARY_COMMA:
assert(0);
return false;
}
if (!cgen_expr(g, e->binary.rhs)) return false;
if (e->binary.op == BINARY_AT_INDEX) {
cgen_write(g, "]");
}
cgen_write(g, ")");
break;
case EXPR_UNARY_OP:
cgen_write(g, "(");
switch (e->unary.op) {
case UNARY_MINUS:
cgen_write(g, "-");
break;
}
if (!cgen_expr(g, e->unary.of)) return false;
cgen_write(g, ")");
break;
case EXPR_FN:
if (!cgen_fn_name(g, &e->fn, &e->where)) return false;
break;
case EXPR_CALL:
if (!cgen_expr(g, e->call.fn)) return false;
cgen_write(g, "(");
arr_foreach(&e->call.args, Expression, arg) {
if (arg != e->call.args.data) {
cgen_write(g, ",");
cgen_write_space(g);
}
if (!cgen_expr(g, arg)) return false;
}
cgen_write(g, ")");
break;
}
return true;
}
static bool cgen_stmt(CGenerator *g, Statement *s);
static void cgen_zero_value(CGenerator *g, Type *t) {
switch (t->kind) {
case TYPE_VOID: /* we should never need this */
assert(0);
break;
case TYPE_FN:
cgen_write(g, "NULL");
break;
case TYPE_ARR:
cgen_write(g, "{");
cgen_zero_value(g, t->arr.of);
cgen_write(g, "}");
break;
case TYPE_TUPLE:
assert(0);
break;
case TYPE_BUILTIN:
if (type_builtin_is_numerical(t->builtin)) {
cgen_write(g, "0");
} else {
assert(0);
}
break;
}
}
static bool cgen_decl(CGenerator *g, Declaration *d) {
size_t i = d->idents.len;
Expression *expr = &d->expr;
/* because , is left-associative, we want to go backwards */
arr_foreach_reverse(&d->idents, Identifier, ident) {
Type *type;
if (d->idents.len > 1) {
/* it's a tuple! */
type = &(((Type*)d->type.tuple.data)[--i]);
} else {
type = &d->type;
if (type->kind == TYPE_TUPLE) {
/* TODO */
err_print(d->where, "Direct declaration of tuples is not supported yet.");
return false;
}
}
cgen_type_pre(g, type);
if (d->flags & DECL_FLAG_CONST) { /* TODO: remove this */
cgen_write_space(g);
cgen_write(g, "const");
cgen_write_space(g);
}
cgen_ident(g, *ident, NULL);
cgen_type_post(g, type);
cgen_write_space(g);
cgen_write(g, "=");
if (d->flags & DECL_FLAG_HAS_EXPR) {
cgen_write_space(g);
if (d->idents.len > 1) {
if (expr->kind == EXPR_BINARY_OP && expr->binary.op == BINARY_COMMA) {
if (!cgen_expr(g, expr->binary.rhs)) return false;
expr = expr->binary.lhs; /* ((3,4),5),6 => (3,4),5 */
} else {
/* last iteration */
if (!cgen_expr(g, expr)) return false;
}
} else {
if (!cgen_expr(g, expr)) return false;
}
} else {
cgen_write_space(g);
cgen_zero_value(g, type);
}
cgen_write(g, "; ");
}
cgen_writeln(g, "");
return true;
}
static bool cgen_stmt(CGenerator *g, Statement *s) {
switch (s->kind) {
case STMT_EXPR:
if (!cgen_expr(g, &s->expr))
return false;
cgen_writeln(g, ";");
break;
case STMT_DECL: {
Declaration *d = &s->decl;
if ((d->flags & DECL_FLAG_HAS_EXPR) && (d->flags & DECL_FLAG_CONST))
if (d->expr.kind == EXPR_FN)
return true; /* already dealt with below */
return cgen_decl(g, &s->decl);
}
}
return true;
}
static bool cgen_fns_in_stmt(CGenerator *g, Statement *s);
/* Generates function definition, and the definitions of all functions inside this */
static bool cgen_fn(CGenerator *g, FnExpr *f) {
if (!cgen_fn_header(g, f)) return false;
Block *prev_block = g->block;
cgen_block_enter(g, &f->body);
bool ret = true;
cgen_write_space(g);
cgen_writeln(g, "{");
g->indent_level++;
arr_foreach(&f->body.stmts, Statement, s) {
if (!cgen_stmt(g, s))
ret = false;
}
g->indent_level--;
cgen_writeln(g, "}");
if (ret) {
arr_foreach(&f->body.stmts, Statement, stmt) {
if (!cgen_fns_in_stmt(g, stmt)) ret = false;
}
}
cgen_block_exit(g, prev_block);
return ret;
}
static bool cgen_fns_in_expr(CGenerator *g, Expression *e) {
switch (e->kind) {
case EXPR_FN:
return cgen_fn(g, &e->fn);
case EXPR_CALL:
return cgen_fns_in_expr(g, e->call.fn);
default: return true;
}
}
static bool cgen_fns_in_stmt(CGenerator *g, Statement *s) {
switch (s->kind) {
case STMT_EXPR:
if (s->expr.kind == EXPR_FN) {
warn_print(s->where, "Statement of function has no effect (try assigning the function to a variable).");
} else {
return cgen_fns_in_expr(g, &s->expr);
}
break;
case STMT_DECL: {
Declaration *d = &s->decl;
if (d->flags & DECL_FLAG_HAS_EXPR)
return cgen_fns_in_expr(g, &d->expr);
} break;
}
return true;
}
static bool cgen_file(CGenerator *g, ParsedFile *f) {
cgen_write_line_comment(g, "toc");
bool ret = true;
if (!cgen_decls_file(g, f)) return false;
arr_foreach(&f->stmts, Statement, s) {
if (!cgen_fns_in_stmt(g, s)) return false;
}
g->writing_to = CGEN_WRITING_TO_C;
/* write actual main function */
cgen_write(g, "\nint main(void) {\n"
"\tmain__();\n"
"\treturn 0;\n"
"}\n");
return ret;
}
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