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add compile error for casting negative value to...

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...unsigned integer at compile-time
This commit is contained in:
Andrew Kelley 2017-05-10 00:21:27 -04:00
parent 6237411716
commit 63f6676fee
2 changed files with 15 additions and 0 deletions
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7
src/ir.cpp
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@ -7053,6 +7053,13 @@ static IrInstruction *ir_analyze_widen_or_shorten(IrAnalyze *ira, IrInstruction
ConstExprValue *val = ir_resolve_const(ira, target, UndefBad);
if (!val)
return ira->codegen->invalid_instruction;
if (val->data.x_bignum.is_negative && wanted_type->id == TypeTableEntryIdInt &&
!wanted_type->data.integral.is_signed)
{
ir_add_error(ira, source_instr,
buf_sprintf("attempt to cast negative value to unsigned integer"));
return ira->codegen->invalid_instruction;
}
IrInstruction *result = ir_create_const(&ira->new_irb, source_instr->scope,
source_instr->source_node, wanted_type);
result->value = *val;

8
test/compile_errors.zig
View File

@ -1801,4 +1801,12 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
\\}
,
".tmp_source.zig:2:7: error: remainder division with 'i32' and 'i32': signed integers and floats must use @rem or @mod");
cases.add("cast negative value to unsigned integer",
\\comptime {
\\ const value: i32 = -1;
\\ const unsigned = u32(value);
\\}
,
".tmp_source.zig:3:25: error: attempt to cast negative value to unsigned integer");
}