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https://github.com/KhronosGroup/SPIRV-Tools
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2d2a512691
* Move ProcessFunction* function from pass to the context. There are a few functions that are used to traverse the call tree. They currently live in the Pass class, but they have nothing to do with a pass, and may be needed outside of a pass. They would be better in the ir context, or in a specific call tree class if we ever have a need for it. * Don't inline recursive functions. Inlining does not check if a function is recursive or not. This has been fine as long as the shader was a Vulkan shader, which forbid recursive functions. However, not all shaders are vulkan, so either we limit inlining to Vulkan shaders or we teach it to look for recursive functions. I prefer to keep the passes as general as is reasonable. The change does not require much new code in inlining and gives a reason to refactor some other code. The changes are to add a member function to the Function class that checks if that function is recursive or not. Then this is used in inlining to not inlining a function call if it calls a recursive function. * Add id to function analysis There are a few places that build a map from ids to Function whose result is that id. I decided to add an analysis to the context for this to reduce that code, and simplify some of the functions. * Add missing file.
57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
// Copyright (c) 2017 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/eliminate_dead_functions_pass.h"
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#include <unordered_set>
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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 EliminateDeadFunctionsPass::Process() {
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// Identify live functions first. Those that are not live
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// are dead.
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std::unordered_set<const Function*> live_function_set;
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ProcessFunction mark_live = [&live_function_set](Function* fp) {
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live_function_set.insert(fp);
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return false;
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};
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context()->ProcessReachableCallTree(mark_live);
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bool modified = false;
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for (auto funcIter = get_module()->begin();
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funcIter != get_module()->end();) {
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if (live_function_set.count(&*funcIter) == 0) {
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modified = true;
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EliminateFunction(&*funcIter);
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funcIter = funcIter.Erase();
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} else {
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++funcIter;
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}
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}
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return modified ? Pass::Status::SuccessWithChange
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: Pass::Status::SuccessWithoutChange;
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}
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void EliminateDeadFunctionsPass::EliminateFunction(Function* func) {
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// Remove all of the instruction in the function body
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func->ForEachInst([this](Instruction* inst) { context()->KillInst(inst); },
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true);
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}
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} // namespace opt
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} // namespace spvtools
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