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This file lists every pass in LLVM, and is included by Pass.h, which is very popular. Every time we add, remove, or rename a pass in LLVM, it caused lots of recompilation. I found this fact by looking at this table, which is sorted by the number of times a file was changed over the last 100,000 git commits multiplied by the number of object files that depend on it in the current checkout: recompiles touches affected_files header 342380 95 3604 llvm/include/llvm/ADT/STLExtras.h 314730 234 1345 llvm/include/llvm/InitializePasses.h 307036 118 2602 llvm/include/llvm/ADT/APInt.h 213049 59 3611 llvm/include/llvm/Support/MathExtras.h 170422 47 3626 llvm/include/llvm/Support/Compiler.h 162225 45 3605 llvm/include/llvm/ADT/Optional.h 158319 63 2513 llvm/include/llvm/ADT/Triple.h 140322 39 3598 llvm/include/llvm/ADT/StringRef.h 137647 59 2333 llvm/include/llvm/Support/Error.h 131619 73 1803 llvm/include/llvm/Support/FileSystem.h Before this change, touching InitializePasses.h would cause 1345 files to recompile. After this change, touching it only causes 550 compiles in an incremental rebuild. Reviewers: bkramer, asbirlea, bollu, jdoerfert Differential Revision: https://reviews.llvm.org/D70211
48 lines
1.7 KiB
C++
48 lines
1.7 KiB
C++
//===- BarrierNoopPass.cpp - A barrier pass for the pass manager ----------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// NOTE: DO NOT USE THIS IF AVOIDABLE
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//
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// This pass is a nonce pass intended to allow manipulation of the implicitly
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// nesting pass manager. For example, it can be used to cause a CGSCC pass
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// manager to be closed prior to running a new collection of function passes.
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//
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// FIXME: This is a huge HACK. This should be removed when the pass manager's
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// nesting is made explicit instead of implicit.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/InitializePasses.h"
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#include "llvm/Pass.h"
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#include "llvm/Transforms/IPO.h"
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using namespace llvm;
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namespace {
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/// A nonce module pass used to place a barrier in a pass manager.
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///
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/// There is no mechanism for ending a CGSCC pass manager once one is started.
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/// This prevents extension points from having clear deterministic ordering
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/// when they are phrased as non-module passes.
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class BarrierNoop : public ModulePass {
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public:
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static char ID; // Pass identification.
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BarrierNoop() : ModulePass(ID) {
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initializeBarrierNoopPass(*PassRegistry::getPassRegistry());
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}
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bool runOnModule(Module &M) override { return false; }
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};
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}
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ModulePass *llvm::createBarrierNoopPass() { return new BarrierNoop(); }
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char BarrierNoop::ID = 0;
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INITIALIZE_PASS(BarrierNoop, "barrier", "A No-Op Barrier Pass",
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false, false)
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