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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
88 lines
3.4 KiB
C++
88 lines
3.4 KiB
C++
//===-- ResetMachineFunctionPass.cpp - Reset Machine Function ----*- C++ -*-==//
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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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/// \file
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/// This file implements a pass that will conditionally reset a machine
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/// function as if it was just created. This is used to provide a fallback
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/// mechanism when GlobalISel fails, thus the condition for the reset to
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/// happen is that the MachineFunction has the FailedISel property.
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/ScopeExit.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/CodeGen/StackProtector.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/IR/DiagnosticInfo.h"
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#include "llvm/Support/Debug.h"
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using namespace llvm;
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#define DEBUG_TYPE "reset-machine-function"
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STATISTIC(NumFunctionsReset, "Number of functions reset");
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namespace {
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class ResetMachineFunction : public MachineFunctionPass {
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/// Tells whether or not this pass should emit a fallback
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/// diagnostic when it resets a function.
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bool EmitFallbackDiag;
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/// Whether we should abort immediately instead of resetting the function.
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bool AbortOnFailedISel;
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public:
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static char ID; // Pass identification, replacement for typeid
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ResetMachineFunction(bool EmitFallbackDiag = false,
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bool AbortOnFailedISel = false)
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: MachineFunctionPass(ID), EmitFallbackDiag(EmitFallbackDiag),
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AbortOnFailedISel(AbortOnFailedISel) {}
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StringRef getPassName() const override { return "ResetMachineFunction"; }
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.addPreserved<StackProtector>();
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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bool runOnMachineFunction(MachineFunction &MF) override {
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// No matter what happened, whether we successfully selected the function
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// or not, nothing is going to use the vreg types after us. Make sure they
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// disappear.
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auto ClearVRegTypesOnReturn =
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make_scope_exit([&MF]() { MF.getRegInfo().clearVirtRegTypes(); });
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if (MF.getProperties().hasProperty(
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MachineFunctionProperties::Property::FailedISel)) {
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if (AbortOnFailedISel)
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report_fatal_error("Instruction selection failed");
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LLVM_DEBUG(dbgs() << "Resetting: " << MF.getName() << '\n');
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++NumFunctionsReset;
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MF.reset();
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if (EmitFallbackDiag) {
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const Function &F = MF.getFunction();
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DiagnosticInfoISelFallback DiagFallback(F);
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F.getContext().diagnose(DiagFallback);
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}
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return true;
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}
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return false;
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}
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};
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} // end anonymous namespace
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char ResetMachineFunction::ID = 0;
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INITIALIZE_PASS(ResetMachineFunction, DEBUG_TYPE,
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"Reset machine function if ISel failed", false, false)
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MachineFunctionPass *
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llvm::createResetMachineFunctionPass(bool EmitFallbackDiag = false,
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bool AbortOnFailedISel = false) {
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return new ResetMachineFunction(EmitFallbackDiag, AbortOnFailedISel);
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}
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