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add compile error for @ptrCast 0 bit type to non-0 bit type

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This commit is contained in:
Andrew Kelley 2018-09-17 19:41:11 -04:00
parent 78a9a465a3
commit b16229da1d
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GPG Key ID: 4E7CD66038A4D47C
2 changed files with 30 additions and 3 deletions
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20
src/ir.cpp
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@ -11528,7 +11528,13 @@ static bool optional_value_is_null(ConstExprValue *val) {
static ZigType *ir_analyze_bin_op_cmp(IrAnalyze *ira, IrInstructionBinOp *bin_op_instruction) {
Error err;
IrInstruction *op1 = bin_op_instruction->op1->other;
if (type_is_invalid(op1->value.type))
return ira->codegen->builtin_types.entry_invalid;
IrInstruction *op2 = bin_op_instruction->op2->other;
if (type_is_invalid(op2->value.type))
return ira->codegen->builtin_types.entry_invalid;
AstNode *source_node = bin_op_instruction->base.source_node;
IrBinOp op_id = bin_op_instruction->op_id;
@ -20190,11 +20196,19 @@ static ZigType *ir_analyze_instruction_ptr_cast(IrAnalyze *ira, IrInstructionPtr
instruction->base.source_node, nullptr, ptr);
casted_ptr->value.type = dest_type;
if (type_has_bits(dest_type) && !type_has_bits(src_type)) {
ErrorMsg *msg = ir_add_error(ira, &instruction->base,
buf_sprintf("'%s' and '%s' do not have the same in-memory representation",
buf_ptr(&src_type->name), buf_ptr(&dest_type->name)));
add_error_note(ira->codegen, msg, ptr->source_node,
buf_sprintf("'%s' has no in-memory bits", buf_ptr(&src_type->name)));
add_error_note(ira->codegen, msg, dest_type_value->source_node,
buf_sprintf("'%s' has in-memory bits", buf_ptr(&dest_type->name)));
return ira->codegen->builtin_types.entry_invalid;
}
// Keep the bigger alignment, it can only help-
// unless the target is zero bits.
if ((err = type_resolve(ira->codegen, dest_type, ResolveStatusZeroBitsKnown)))
return ira->codegen->builtin_types.entry_invalid;
IrInstruction *result;
if (src_align_bytes > dest_align_bytes && type_has_bits(dest_type)) {
result = ir_align_cast(ira, casted_ptr, src_align_bytes, false);

13
test/compile_errors.zig
View File

@ -1,6 +1,19 @@
const tests = @import("tests.zig");
pub fn addCases(cases: *tests.CompileErrorContext) void {
cases.add(
"@ptrCast a 0 bit type to a non- 0 bit type",
\\export fn entry() bool {
\\ var x: u0 = 0;
\\ const p = @ptrCast(?*u0, &x);
\\ return p == null;
\\}
,
".tmp_source.zig:3:15: error: '*u0' and '?*u0' do not have the same in-memory representation",
".tmp_source.zig:3:31: note: '*u0' has no in-memory bits",
".tmp_source.zig:3:24: note: '?*u0' has in-memory bits",
);
cases.add(
"comparing a non-optional pointer against null",
\\export fn entry() void {