diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/ir.cpp | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/src/ir.cpp b/src/ir.cpp index 19bec193d5..f064adb128 100644 --- a/src/ir.cpp +++ b/src/ir.cpp @@ -20645,12 +20645,23 @@ static IrInstruction *ir_analyze_ptr_cast(IrAnalyze *ira, IrInstruction *source_ } if (instr_is_comptime(ptr)) { - // Undefined is OK here; @ptrCast is defined to reinterpret the bit pattern - // of the pointer as the new pointer type. - ConstExprValue *val = ir_resolve_const(ira, ptr, UndefOk); + bool dest_allows_addr_zero = ptr_allows_addr_zero(dest_type); + UndefAllowed is_undef_allowed = dest_allows_addr_zero ? UndefOk : UndefBad; + ConstExprValue *val = ir_resolve_const(ira, ptr, is_undef_allowed); if (!val) return ira->codegen->invalid_instruction; + if (val->special == ConstValSpecialStatic) { + bool is_addr_zero = val->data.x_ptr.special == ConstPtrSpecialNull || + (val->data.x_ptr.special == ConstPtrSpecialHardCodedAddr && + val->data.x_ptr.data.hard_coded_addr.addr == 0); + if (is_addr_zero && !dest_allows_addr_zero) { + ir_add_error(ira, source_instr, + buf_sprintf("null pointer casted to type '%s'", buf_ptr(&dest_type->name))); + return ira->codegen->invalid_instruction; + } + } + IrInstruction *result = ir_const(ira, source_instr, dest_type); copy_const_val(&result->value, val, false); result->value.type = dest_type; |