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`#sizeof` allowed in constant expression

master
Andrew Kelley 2016-01-05 16:46:20 -07:00
parent d006ea98dd
commit bfb3e7fcb1
1 changed files with 29 additions and 7 deletions
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36
src/analyze.cpp
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@ -114,18 +114,20 @@ TypeTableEntry *new_type_table_entry(TypeTableEntryId id) {
return entry;
}
static TypeTableEntry *get_number_literal_type_unsigned(CodeGen *g, uint64_t x) {
NumLit kind;
static NumLit get_number_literal_kind_unsigned(uint64_t x) {
if (x <= UINT8_MAX) {
kind = NumLitU8;
return NumLitU8;
} else if (x <= UINT16_MAX) {
kind = NumLitU16;
return NumLitU16;
} else if (x <= UINT32_MAX) {
kind = NumLitU32;
return NumLitU32;
} else {
kind = NumLitU64;
return NumLitU64;
}
return g->num_lit_types[kind];
}
static TypeTableEntry *get_number_literal_type_unsigned(CodeGen *g, uint64_t x) {
return g->num_lit_types[get_number_literal_kind_unsigned(x)];
}
TypeTableEntry *get_pointer_to_type(CodeGen *g, TypeTableEntry *child_type, bool is_const) {
@ -243,6 +245,26 @@ static TypeTableEntry *eval_const_expr(CodeGen *g, BlockContext *context,
case NodeTypeBinOpExpr:
zig_panic("TODO eval_const_expr bin op expr");
break;
case NodeTypeCompilerFnType:
{
Buf *name = &node->data.compiler_fn_type.name;
TypeTableEntry *expr_type = node->codegen_node->expr_node.type_entry;
if (buf_eql_str(name, "sizeof")) {
TypeTableEntry *target_type = node->data.compiler_fn_type.type->codegen_node->data.type_node.entry;
out_number_literal->overflow = false;
out_number_literal->data.x_uint = target_type->size_in_bits / 8;
out_number_literal->kind = get_number_literal_kind_unsigned(out_number_literal->data.x_uint);
return expr_type;
} else if (buf_eql_str(name, "max_value")) {
zig_panic("TODO eval_const_expr max_value");
} else if (buf_eql_str(name, "min_value")) {
zig_panic("TODO eval_const_expr min_value");
} else {
return g->builtin_types.entry_invalid;
}
break;
}
case NodeTypeSymbol:
{
VariableTableEntry *var = find_variable(context, &node->data.symbol);