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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.
40 lines
1.3 KiB
C++
40 lines
1.3 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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// This file implements a pass to cleanup the CFG to remove superfluous
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// constructs (e.g., unreachable basic blocks, empty control flow structures,
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// etc)
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#include <queue>
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#include <unordered_set>
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#include "source/opt/cfg_cleanup_pass.h"
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#include "source/opt/function.h"
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#include "source/opt/module.h"
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namespace spvtools {
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namespace opt {
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Pass::Status CFGCleanupPass::Process() {
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// Process all entry point functions.
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ProcessFunction pfn = [this](Function* fp) { return CFGCleanup(fp); };
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bool modified = context()->ProcessReachableCallTree(pfn);
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return modified ? Pass::Status::SuccessWithChange
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: Pass::Status::SuccessWithoutChange;
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}
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} // namespace opt
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} // namespace spvtools
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