You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
48 lines
1.6 KiB
48 lines
1.6 KiB
//===- BarrierNoopPass.cpp - A barrier pass for the pass manager ----------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// NOTE: DO NOT USE THIS IF AVOIDABLE
|
|
//
|
|
// This pass is a nonce pass intended to allow manipulation of the implicitly
|
|
// nesting pass manager. For example, it can be used to cause a CGSCC pass
|
|
// manager to be closed prior to running a new collection of function passes.
|
|
//
|
|
// FIXME: This is a huge HACK. This should be removed when the pass manager's
|
|
// nesting is made explicit instead of implicit.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Pass.h"
|
|
#include "llvm/Transforms/IPO.h"
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
/// \brief A nonce module pass used to place a barrier in a pass manager.
|
|
///
|
|
/// There is no mechanism for ending a CGSCC pass manager once one is started.
|
|
/// This prevents extension points from having clear deterministic ordering
|
|
/// when they are phrased as non-module passes.
|
|
class BarrierNoop : public ModulePass {
|
|
public:
|
|
static char ID; // Pass identification.
|
|
|
|
BarrierNoop() : ModulePass(ID) {
|
|
initializeBarrierNoopPass(*PassRegistry::getPassRegistry());
|
|
}
|
|
|
|
bool runOnModule(Module &M) override { return false; }
|
|
};
|
|
}
|
|
|
|
ModulePass *llvm::createBarrierNoopPass() { return new BarrierNoop(); }
|
|
|
|
char BarrierNoop::ID = 0;
|
|
INITIALIZE_PASS(BarrierNoop, "barrier", "A No-Op Barrier Pass",
|
|
false, false)
|