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stage2: runtime safety check intCast to u0 must fit

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Mitchell Hashimoto 2022-03-25 09:53:07 -07:00
parent 8fbac2e86d
commit 4ad98d0714
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1 changed files with 15 additions and 1 deletions
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16
src/Sema.zig
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@ -6782,6 +6782,20 @@ fn intCast(
}
if ((try sema.typeHasOnePossibleValue(block, dest_ty_src, dest_ty))) |opv| {
// requirement: intCast(u0, input) iff input == 0
if (runtime_safety and block.wantSafety()) {
try sema.requireRuntimeBlock(block, operand_src);
const target = sema.mod.getTarget();
const wanted_info = dest_ty.intInfo(target);
const wanted_bits = wanted_info.bits;
if (wanted_bits == 0) {
const zero_inst = try sema.addConstant(sema.typeOf(operand), Value.zero);
const is_in_range = try block.addBinOp(.cmp_eq, operand, zero_inst);
try sema.addSafetyCheck(block, is_in_range, .cast_truncated_data);
}
}
return sema.addConstant(dest_ty, opv);
}
@ -6794,7 +6808,7 @@ fn intCast(
const actual_bits = actual_info.bits;
const wanted_bits = wanted_info.bits;
// requirement: operand can fit into bit size of destination type
// requirement: bitSizeOf(operand) <= bitSizeOf(destination type)
if (actual_bits > wanted_bits) {
const max_int = try dest_ty.maxInt(sema.arena, target);
const max_int_inst = try sema.addConstant(operand_ty, max_int);