110 lines
3.9 KiB
C++
110 lines
3.9 KiB
C++
// Copyright (c) 2016 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "source/opt/strip_debug_info_pass.h"
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#include "source/opt/ir_context.h"
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namespace spvtools {
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namespace opt {
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Pass::Status StripDebugInfoPass::Process() {
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bool uses_non_semantic_info = false;
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for (auto& inst : context()->module()->extensions()) {
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const char* ext_name =
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reinterpret_cast<const char*>(&inst.GetInOperand(0).words[0]);
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if (0 == std::strcmp(ext_name, "SPV_KHR_non_semantic_info")) {
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uses_non_semantic_info = true;
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}
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}
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std::vector<Instruction*> to_kill;
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// if we use non-semantic info, it may reference OpString. Do a more
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// expensive pass checking the uses of the OpString to see if any are
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// OpExtInst on a non-semantic instruction set. If we're not using the
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// extension then we can do a simpler pass and kill all debug1 instructions
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if (uses_non_semantic_info) {
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for (auto& inst : context()->module()->debugs1()) {
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switch (inst.opcode()) {
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case SpvOpString: {
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analysis::DefUseManager* def_use = context()->get_def_use_mgr();
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// see if this string is used anywhere by a non-semantic instruction
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bool no_nonsemantic_use =
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def_use->WhileEachUser(&inst, [def_use](Instruction* use) {
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if (use->opcode() == SpvOpExtInst) {
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auto ext_inst_set =
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def_use->GetDef(use->GetSingleWordInOperand(0u));
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const char* extension_name = reinterpret_cast<const char*>(
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&ext_inst_set->GetInOperand(0).words[0]);
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if (0 == std::strncmp(extension_name, "NonSemantic.", 12)) {
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// found a non-semantic use, return false as we cannot
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// remove this OpString
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return false;
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}
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}
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// other instructions can't be a non-semantic use
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return true;
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});
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if (no_nonsemantic_use) to_kill.push_back(&inst);
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break;
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}
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default:
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to_kill.push_back(&inst);
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break;
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}
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}
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} else {
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for (auto& dbg : context()->debugs1()) to_kill.push_back(&dbg);
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}
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for (auto& dbg : context()->debugs2()) to_kill.push_back(&dbg);
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for (auto& dbg : context()->debugs3()) to_kill.push_back(&dbg);
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for (auto& dbg : context()->ext_inst_debuginfo()) to_kill.push_back(&dbg);
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// OpName must come first, since they may refer to other debug instructions.
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// If they are after the instructions that refer to, then they will be killed
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// when that instruction is killed, which will lead to a double kill.
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std::sort(to_kill.begin(), to_kill.end(),
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[](Instruction* lhs, Instruction* rhs) -> bool {
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if (lhs->opcode() == SpvOpName && rhs->opcode() != SpvOpName)
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return true;
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return false;
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});
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bool modified = !to_kill.empty();
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for (auto* inst : to_kill) context()->KillInst(inst);
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// clear OpLine information
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context()->module()->ForEachInst([&modified](Instruction* inst) {
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modified |= !inst->dbg_line_insts().empty();
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inst->dbg_line_insts().clear();
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});
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if (!get_module()->trailing_dbg_line_info().empty()) {
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modified = true;
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get_module()->trailing_dbg_line_info().clear();
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}
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return modified ? Status::SuccessWithChange : Status::SuccessWithoutChange;
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}
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} // namespace opt
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} // namespace spvtools
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