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fix discarding function call results

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This commit is contained in:
Andrew Kelley 2019-08-02 15:17:02 -04:00
parent 90e64bc620
commit 9069ee957c
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GPG Key ID: 7C5F548F728501A9
2 changed files with 58 additions and 26 deletions
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65
src/ir.cpp
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@ -189,7 +189,8 @@ static IrInstruction *ir_analyze_bit_cast(IrAnalyze *ira, IrInstruction *source_
static IrInstruction *ir_resolve_result_raw(IrAnalyze *ira, IrInstruction *suspend_source_instr,
ResultLoc *result_loc, ZigType *value_type, IrInstruction *value, bool force_runtime, bool non_null_comptime);
static IrInstruction *ir_resolve_result(IrAnalyze *ira, IrInstruction *suspend_source_instr,
ResultLoc *result_loc, ZigType *value_type, IrInstruction *value, bool force_runtime, bool non_null_comptime);
ResultLoc *result_loc, ZigType *value_type, IrInstruction *value, bool force_runtime,
bool non_null_comptime, bool allow_discard);
static IrInstruction *ir_analyze_unwrap_optional_payload(IrAnalyze *ira, IrInstruction *source_instr,
IrInstruction *base_ptr, bool safety_check_on, bool initializing);
static IrInstruction *ir_analyze_unwrap_error_payload(IrAnalyze *ira, IrInstruction *source_instr,
@ -11163,7 +11164,8 @@ static IrInstruction *ir_resolve_ptr_of_array_to_slice(IrAnalyze *ira, IrInstruc
}
if (result_loc == nullptr) result_loc = no_result_loc();
IrInstruction *result_loc_inst = ir_resolve_result(ira, source_instr, result_loc, wanted_type, nullptr, true, false);
IrInstruction *result_loc_inst = ir_resolve_result(ira, source_instr, result_loc, wanted_type, nullptr, true,
false, true);
if (type_is_invalid(result_loc_inst->value.type) || instr_is_unreachable(result_loc_inst)) {
return result_loc_inst;
}
@ -11623,7 +11625,7 @@ static IrInstruction *ir_analyze_optional_wrap(IrAnalyze *ira, IrInstruction *so
}
IrInstruction *result_loc_inst = nullptr;
if (result_loc != nullptr) {
result_loc_inst = ir_resolve_result(ira, source_instr, result_loc, wanted_type, nullptr, true, false);
result_loc_inst = ir_resolve_result(ira, source_instr, result_loc, wanted_type, nullptr, true, false, true);
if (type_is_invalid(result_loc_inst->value.type) || instr_is_unreachable(result_loc_inst)) {
return result_loc_inst;
}
@ -11666,7 +11668,7 @@ static IrInstruction *ir_analyze_err_wrap_payload(IrAnalyze *ira, IrInstruction
IrInstruction *result_loc_inst;
if (handle_is_ptr(wanted_type)) {
if (result_loc == nullptr) result_loc = no_result_loc();
result_loc_inst = ir_resolve_result(ira, source_instr, result_loc, wanted_type, nullptr, true, false);
result_loc_inst = ir_resolve_result(ira, source_instr, result_loc, wanted_type, nullptr, true, false, true);
if (type_is_invalid(result_loc_inst->value.type) || instr_is_unreachable(result_loc_inst)) {
return result_loc_inst;
}
@ -11751,7 +11753,7 @@ static IrInstruction *ir_analyze_err_wrap_code(IrAnalyze *ira, IrInstruction *so
IrInstruction *result_loc_inst;
if (handle_is_ptr(wanted_type)) {
if (result_loc == nullptr) result_loc = no_result_loc();
result_loc_inst = ir_resolve_result(ira, source_instr, result_loc, wanted_type, nullptr, true, false);
result_loc_inst = ir_resolve_result(ira, source_instr, result_loc, wanted_type, nullptr, true, false, true);
if (type_is_invalid(result_loc_inst->value.type) || instr_is_unreachable(result_loc_inst)) {
return result_loc_inst;
}
@ -11824,7 +11826,8 @@ static IrInstruction *ir_get_ref(IrAnalyze *ira, IrInstruction *source_instructi
IrInstruction *result_loc;
if (type_has_bits(ptr_type) && !handle_is_ptr(value->value.type)) {
result_loc = ir_resolve_result(ira, source_instruction, no_result_loc(), value->value.type, nullptr, true, false);
result_loc = ir_resolve_result(ira, source_instruction, no_result_loc(), value->value.type, nullptr, true,
false, true);
} else {
result_loc = nullptr;
}
@ -11868,7 +11871,8 @@ static IrInstruction *ir_analyze_array_to_slice(IrAnalyze *ira, IrInstruction *s
if (!array_ptr) array_ptr = ir_get_ref(ira, source_instr, array, true, false);
if (result_loc == nullptr) result_loc = no_result_loc();
IrInstruction *result_loc_inst = ir_resolve_result(ira, source_instr, result_loc, wanted_type, nullptr, true, false);
IrInstruction *result_loc_inst = ir_resolve_result(ira, source_instr, result_loc, wanted_type, nullptr,
true, false, true);
if (type_is_invalid(result_loc_inst->value.type) || instr_is_unreachable(result_loc_inst)) {
return result_loc_inst;
}
@ -12524,7 +12528,8 @@ static IrInstruction *ir_analyze_vector_to_array(IrAnalyze *ira, IrInstruction *
if (result_loc == nullptr) {
result_loc = no_result_loc();
}
IrInstruction *result_loc_inst = ir_resolve_result(ira, source_instr, result_loc, array_type, nullptr, true, false);
IrInstruction *result_loc_inst = ir_resolve_result(ira, source_instr, result_loc, array_type, nullptr,
true, false, true);
if (type_is_invalid(result_loc_inst->value.type) || instr_is_unreachable(result_loc_inst)) {
return result_loc_inst;
}
@ -13105,7 +13110,8 @@ static IrInstruction *ir_get_deref(IrAnalyze *ira, IrInstruction *source_instruc
IrInstruction *result_loc_inst;
if (type_entry->data.pointer.host_int_bytes != 0 && handle_is_ptr(child_type)) {
if (result_loc == nullptr) result_loc = no_result_loc();
result_loc_inst = ir_resolve_result(ira, source_instruction, result_loc, child_type, nullptr, true, false);
result_loc_inst = ir_resolve_result(ira, source_instruction, result_loc, child_type, nullptr,
true, false, true);
if (type_is_invalid(result_loc_inst->value.type) || instr_is_unreachable(result_loc_inst)) {
return result_loc_inst;
}
@ -15360,7 +15366,7 @@ static IrInstruction *ir_resolve_result_raw(IrAnalyze *ira, IrInstruction *suspe
if (peer_parent->peers.length == 1) {
IrInstruction *parent_result_loc = ir_resolve_result(ira, suspend_source_instr, peer_parent->parent,
value_type, value, force_runtime, non_null_comptime);
value_type, value, force_runtime, non_null_comptime, true);
result_peer->suspend_pos.basic_block_index = SIZE_MAX;
result_peer->suspend_pos.instruction_index = SIZE_MAX;
if (parent_result_loc == nullptr || type_is_invalid(parent_result_loc->value.type) ||
@ -15380,7 +15386,7 @@ static IrInstruction *ir_resolve_result_raw(IrAnalyze *ira, IrInstruction *suspe
if (peer_parent->skipped) {
if (non_null_comptime) {
return ir_resolve_result(ira, suspend_source_instr, peer_parent->parent,
value_type, value, force_runtime, non_null_comptime);
value_type, value, force_runtime, non_null_comptime, true);
}
return nullptr;
}
@ -15398,7 +15404,7 @@ static IrInstruction *ir_resolve_result_raw(IrAnalyze *ira, IrInstruction *suspe
}
IrInstruction *parent_result_loc = ir_resolve_result(ira, suspend_source_instr, peer_parent->parent,
peer_parent->resolved_type, nullptr, force_runtime, non_null_comptime);
peer_parent->resolved_type, nullptr, force_runtime, non_null_comptime, true);
if (parent_result_loc == nullptr || type_is_invalid(parent_result_loc->value.type) ||
parent_result_loc->value.type->id == ZigTypeIdUnreachable)
{
@ -15448,7 +15454,7 @@ static IrInstruction *ir_resolve_result_raw(IrAnalyze *ira, IrInstruction *suspe
}
IrInstruction *parent_result_loc = ir_resolve_result(ira, suspend_source_instr, result_bit_cast->parent,
dest_type, bitcasted_value, force_runtime, non_null_comptime);
dest_type, bitcasted_value, force_runtime, non_null_comptime, true);
if (parent_result_loc == nullptr || type_is_invalid(parent_result_loc->value.type) ||
parent_result_loc->value.type->id == ZigTypeIdUnreachable)
{
@ -15477,8 +15483,15 @@ static IrInstruction *ir_resolve_result_raw(IrAnalyze *ira, IrInstruction *suspe
static IrInstruction *ir_resolve_result(IrAnalyze *ira, IrInstruction *suspend_source_instr,
ResultLoc *result_loc_pass1, ZigType *value_type, IrInstruction *value, bool force_runtime,
bool non_null_comptime)
bool non_null_comptime, bool allow_discard)
{
if (!allow_discard && result_loc_pass1->id == ResultLocIdInstruction &&
instr_is_comptime(result_loc_pass1->source_instruction) &&
result_loc_pass1->source_instruction->value.type->id == ZigTypeIdPointer &&
result_loc_pass1->source_instruction->value.data.x_ptr.special == ConstPtrSpecialDiscard)
{
result_loc_pass1 = no_result_loc();
}
IrInstruction *result_loc = ir_resolve_result_raw(ira, suspend_source_instr, result_loc_pass1, value_type,
value, force_runtime, non_null_comptime);
if (result_loc == nullptr || (instr_is_unreachable(result_loc) || type_is_invalid(result_loc->value.type)))
@ -15533,7 +15546,7 @@ static IrInstruction *ir_analyze_instruction_resolve_result(IrAnalyze *ira, IrIn
if (type_is_invalid(implicit_elem_type))
return ira->codegen->invalid_instruction;
IrInstruction *result_loc = ir_resolve_result(ira, &instruction->base, instruction->result_loc,
implicit_elem_type, nullptr, false, true);
implicit_elem_type, nullptr, false, true, true);
if (result_loc != nullptr)
return result_loc;
@ -15542,7 +15555,7 @@ static IrInstruction *ir_analyze_instruction_resolve_result(IrAnalyze *ira, IrIn
instruction->result_loc->id == ResultLocIdReturn)
{
result_loc = ir_resolve_result(ira, &instruction->base, no_result_loc(),
implicit_elem_type, nullptr, false, true);
implicit_elem_type, nullptr, false, true, true);
if (result_loc != nullptr &&
(type_is_invalid(result_loc->value.type) || instr_is_unreachable(result_loc)))
{
@ -15631,7 +15644,7 @@ static IrInstruction *ir_analyze_async_call(IrAnalyze *ira, IrInstructionCallSrc
ZigType *async_return_type = get_error_union_type(ira->codegen, alloc_fn_error_set_type, promise_type);
IrInstruction *result_loc = ir_resolve_result(ira, &call_instruction->base, no_result_loc(),
async_return_type, nullptr, true, true);
async_return_type, nullptr, true, true, false);
if (type_is_invalid(result_loc->value.type) || instr_is_unreachable(result_loc)) {
return result_loc;
}
@ -16390,7 +16403,7 @@ static IrInstruction *ir_analyze_fn_call(IrAnalyze *ira, IrInstructionCallSrc *c
IrInstruction *result_loc;
if (handle_is_ptr(impl_fn_type_id->return_type)) {
result_loc = ir_resolve_result(ira, &call_instruction->base, call_instruction->result_loc,
impl_fn_type_id->return_type, nullptr, true, true);
impl_fn_type_id->return_type, nullptr, true, true, false);
if (result_loc != nullptr && (type_is_invalid(result_loc->value.type) ||
instr_is_unreachable(result_loc)))
{
@ -16512,7 +16525,7 @@ static IrInstruction *ir_analyze_fn_call(IrAnalyze *ira, IrInstructionCallSrc *c
IrInstruction *result_loc;
if (handle_is_ptr(return_type)) {
result_loc = ir_resolve_result(ira, &call_instruction->base, call_instruction->result_loc,
return_type, nullptr, true, true);
return_type, nullptr, true, true, false);
if (result_loc != nullptr && (type_is_invalid(result_loc->value.type) || instr_is_unreachable(result_loc))) {
return result_loc;
}
@ -17028,7 +17041,7 @@ static IrInstruction *ir_analyze_instruction_phi(IrAnalyze *ira, IrInstructionPh
// In case resolving the parent activates a suspend, do it now
IrInstruction *parent_result_loc = ir_resolve_result(ira, &phi_instruction->base, peer_parent->parent,
peer_parent->resolved_type, nullptr, false, false);
peer_parent->resolved_type, nullptr, false, false, true);
if (parent_result_loc != nullptr &&
(type_is_invalid(parent_result_loc->value.type) || instr_is_unreachable(parent_result_loc)))
{
@ -21541,7 +21554,7 @@ static IrInstruction *ir_analyze_instruction_cmpxchg(IrAnalyze *ira, IrInstructi
IrInstruction *result_loc;
if (handle_is_ptr(result_type)) {
result_loc = ir_resolve_result(ira, &instruction->base, instruction->result_loc,
result_type, nullptr, true, false);
result_type, nullptr, true, false, true);
if (type_is_invalid(result_loc->value.type) || instr_is_unreachable(result_loc)) {
return result_loc;
}
@ -21798,7 +21811,7 @@ static IrInstruction *ir_analyze_instruction_from_bytes(IrAnalyze *ira, IrInstru
}
IrInstruction *result_loc = ir_resolve_result(ira, &instruction->base, instruction->result_loc,
dest_slice_type, nullptr, true, false);
dest_slice_type, nullptr, true, false, true);
if (result_loc != nullptr && (type_is_invalid(result_loc->value.type) || instr_is_unreachable(result_loc))) {
return result_loc;
}
@ -21875,7 +21888,7 @@ static IrInstruction *ir_analyze_instruction_to_bytes(IrAnalyze *ira, IrInstruct
}
IrInstruction *result_loc = ir_resolve_result(ira, &instruction->base, instruction->result_loc,
dest_slice_type, nullptr, true, false);
dest_slice_type, nullptr, true, false, true);
if (type_is_invalid(result_loc->value.type) || instr_is_unreachable(result_loc)) {
return result_loc;
}
@ -22617,7 +22630,7 @@ static IrInstruction *ir_analyze_instruction_slice(IrAnalyze *ira, IrInstruction
}
IrInstruction *result_loc = ir_resolve_result(ira, &instruction->base, instruction->result_loc,
return_type, nullptr, true, false);
return_type, nullptr, true, false, true);
if (type_is_invalid(result_loc->value.type) || instr_is_unreachable(result_loc)) {
return result_loc;
}
@ -25397,7 +25410,7 @@ static IrInstruction *ir_analyze_instruction_end_expr(IrAnalyze *ira, IrInstruct
bool was_written = instruction->result_loc->written;
IrInstruction *result_loc = ir_resolve_result(ira, &instruction->base, instruction->result_loc,
value->value.type, value, false, false);
value->value.type, value, false, false, true);
if (result_loc != nullptr) {
if (type_is_invalid(result_loc->value.type))
return ira->codegen->invalid_instruction;
@ -25429,7 +25442,7 @@ static IrInstruction *ir_analyze_instruction_bit_cast_src(IrAnalyze *ira, IrInst
return operand;
IrInstruction *result_loc = ir_resolve_result(ira, &instruction->base,
&instruction->result_loc_bit_cast->base, operand->value.type, operand, false, false);
&instruction->result_loc_bit_cast->base, operand->value.type, operand, false, false, true);
if (result_loc != nullptr && (type_is_invalid(result_loc->value.type) || instr_is_unreachable(result_loc)))
return result_loc;

19
test/stage1/behavior/fn.zig
View File

@ -228,3 +228,22 @@ test "implicit cast fn call result to optional in field result" {
S.entry();
comptime S.entry();
}
test "discard the result of a function that returns a struct" {
const S = struct {
fn entry() void {
_ = func();
}
fn func() Foo {
return undefined;
}
const Foo = struct {
a: u64,
b: u64,
};
};
S.entry();
comptime S.entry();
}