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// Copyright (c) 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "source/opt/replace_invalid_opc.h"
#include <bitset>
#include <vector>
namespace spvtools {
namespace opt {
Pass::Status ReplaceInvalidOpcodePass::Process() {
bool modified = false;
if (context()->get_feature_mgr()->HasCapability(SpvCapabilityLinkage)) {
return Status::SuccessWithoutChange;
}
SpvExecutionModel execution_model = GetExecutionModel();
if (execution_model == SpvExecutionModelKernel) {
// We do not handle kernels.
return Status::SuccessWithoutChange;
}
if (execution_model == SpvExecutionModelMax) {
// Mixed execution models for the entry points. This case is not currently
// handled.
return Status::SuccessWithoutChange;
}
for (Function& func : *get_module()) {
modified |= RewriteFunction(&func, execution_model);
}
return (modified ? Status::SuccessWithChange : Status::SuccessWithoutChange);
}
SpvExecutionModel ReplaceInvalidOpcodePass::GetExecutionModel() {
SpvExecutionModel result = SpvExecutionModelMax;
bool first = true;
for (Instruction& entry_point : get_module()->entry_points()) {
if (first) {
result =
static_cast<SpvExecutionModel>(entry_point.GetSingleWordInOperand(0));
first = false;
} else {
SpvExecutionModel current_model =
static_cast<SpvExecutionModel>(entry_point.GetSingleWordInOperand(0));
if (current_model != result) {
result = SpvExecutionModelMax;
break;
}
}
}
return result;
}
bool ReplaceInvalidOpcodePass::RewriteFunction(Function* function,
SpvExecutionModel model) {
bool modified = false;
Instruction* last_line_dbg_inst = nullptr;
function->ForEachInst(
[model, &modified, &last_line_dbg_inst, this](Instruction* inst) {
// Track the debug information so we can have a meaningful message.
if (inst->opcode() == SpvOpLabel || inst->opcode() == SpvOpNoLine) {
last_line_dbg_inst = nullptr;
return;
} else if (inst->opcode() == SpvOpLine) {
last_line_dbg_inst = inst;
return;
}
bool replace = false;
if (model != SpvExecutionModelFragment &&
IsFragmentShaderOnlyInstruction(inst)) {
replace = true;
}
if (model != SpvExecutionModelTessellationControl &&
model != SpvExecutionModelGLCompute) {
if (inst->opcode() == SpvOpControlBarrier) {
assert(model != SpvExecutionModelKernel &&
"Expecting to be working on a shader module.");
replace = true;
}
}
if (replace) {
modified = true;
if (last_line_dbg_inst == nullptr) {
ReplaceInstruction(inst, nullptr, 0, 0);
} else {
// Get the name of the source file.
Instruction* file_name = context()->get_def_use_mgr()->GetDef(
last_line_dbg_inst->GetSingleWordInOperand(0));
const char* source = reinterpret_cast<const char*>(
&file_name->GetInOperand(0).words[0]);
// Get the line number and column number.
uint32_t line_number =
last_line_dbg_inst->GetSingleWordInOperand(1);
uint32_t col_number = last_line_dbg_inst->GetSingleWordInOperand(2);
// Replace the instruction.
ReplaceInstruction(inst, source, line_number, col_number);
}
}
},
/* run_on_debug_line_insts = */ true);
return modified;
}
bool ReplaceInvalidOpcodePass::IsFragmentShaderOnlyInstruction(
Instruction* inst) {
switch (inst->opcode()) {
case SpvOpDPdx:
case SpvOpDPdy:
case SpvOpFwidth:
case SpvOpDPdxFine:
case SpvOpDPdyFine:
case SpvOpFwidthFine:
case SpvOpDPdxCoarse:
case SpvOpDPdyCoarse:
case SpvOpFwidthCoarse:
case SpvOpImageSampleImplicitLod:
case SpvOpImageSampleDrefImplicitLod:
case SpvOpImageSampleProjImplicitLod:
case SpvOpImageSampleProjDrefImplicitLod:
case SpvOpImageSparseSampleImplicitLod:
case SpvOpImageSparseSampleDrefImplicitLod:
case SpvOpImageQueryLod:
// TODO: Teach |ReplaceInstruction| to handle block terminators. Then
// uncomment the OpKill case.
// case SpvOpKill:
// case SpvOpTerminateInstruction:
return true;
default:
return false;
}
}
void ReplaceInvalidOpcodePass::ReplaceInstruction(Instruction* inst,
const char* source,
uint32_t line_number,
uint32_t column_number) {
if (inst->result_id() != 0) {
uint32_t const_id = GetSpecialConstant(inst->type_id());
context()->KillNamesAndDecorates(inst);
context()->ReplaceAllUsesWith(inst->result_id(), const_id);
}
assert(!inst->IsBlockTerminator() &&
"We cannot simply delete a block terminator. It must be replaced "
"with something.");
if (consumer()) {
std::string message = BuildWarningMessage(inst->opcode());
consumer()(SPV_MSG_WARNING, source, {line_number, column_number, 0},
message.c_str());
}
context()->KillInst(inst);
}
uint32_t ReplaceInvalidOpcodePass::GetSpecialConstant(uint32_t type_id) {
const analysis::Constant* special_const = nullptr;
analysis::ConstantManager* const_mgr = context()->get_constant_mgr();
analysis::TypeManager* type_mgr = context()->get_type_mgr();
Instruction* type = context()->get_def_use_mgr()->GetDef(type_id);
if (type->opcode() == SpvOpTypeVector) {
uint32_t component_const =
GetSpecialConstant(type->GetSingleWordInOperand(0));
std::vector<uint32_t> ids;
for (uint32_t i = 0; i < type->GetSingleWordInOperand(1); ++i) {
ids.push_back(component_const);
}
special_const = const_mgr->GetConstant(type_mgr->GetType(type_id), ids);
} else {
assert(type->opcode() == SpvOpTypeInt || type->opcode() == SpvOpTypeFloat);
std::vector<uint32_t> literal_words;
for (uint32_t i = 0; i < type->GetSingleWordInOperand(0); i += 32) {
literal_words.push_back(0xDEADBEEF);
}
special_const =
const_mgr->GetConstant(type_mgr->GetType(type_id), literal_words);
}
assert(special_const != nullptr);
return const_mgr->GetDefiningInstruction(special_const)->result_id();
}
std::string ReplaceInvalidOpcodePass::BuildWarningMessage(SpvOp opcode) {
spv_opcode_desc opcode_info;
context()->grammar().lookupOpcode(opcode, &opcode_info);
std::string message = "Removing ";
message += opcode_info->name;
message += " instruction because of incompatible execution model.";
return message;
}
} // namespace opt
} // namespace spvtools
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