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compile error for not-aligned-enough pointer to cmpxchg

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See #37
This commit is contained in:
Andrew Kelley 2017-08-30 02:56:42 -04:00
parent 010b725bde
commit e9280c86a1
2 changed files with 19 additions and 0 deletions
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9
src/ir.cpp
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@ -13488,6 +13488,15 @@ static TypeTableEntry *ir_analyze_instruction_cmpxchg(IrAnalyze *ira, IrInstruct
TypeTableEntry *child_type = ptr->value.type->data.pointer.child_type;
uint32_t align_bytes = ptr->value.type->data.pointer.alignment;
uint64_t size_bytes = type_size(ira->codegen, child_type);
if (align_bytes < size_bytes) {
ir_add_error(ira, instruction->ptr,
buf_sprintf("expected pointer alignment of at least %" ZIG_PRI_u64 ", found %" PRIu32,
size_bytes, align_bytes));
return ira->codegen->builtin_types.entry_invalid;
}
IrInstruction *casted_cmp_value = ir_implicit_cast(ira, cmp_value, child_type);
if (type_is_invalid(casted_cmp_value->value.type))
return ira->codegen->builtin_types.entry_invalid;

10
test/compile_errors.zig
View File

@ -2051,4 +2051,14 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
,
".tmp_source.zig:2:35: error: expected type 'fn() align 8 -> i32', found 'fn() align 4 -> i32'");
cases.add("passing a not-aligned-enough pointer to cmpxchg",
\\const AtomicOrder = @import("builtin").AtomicOrder;
\\export fn entry() -> bool {
\\ var x: i32 align 1 = 1234;
\\ while (!@cmpxchg(&x, 1234, 5678, AtomicOrder.SeqCst, AtomicOrder.SeqCst)) {}
\\ return x == 5678;
\\}
,
".tmp_source.zig:4:23: error: expected pointer alignment of at least 4, found 1");
}