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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
47 lines
1.6 KiB
C++
47 lines
1.6 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/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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