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.
91 lines
3.5 KiB
91 lines
3.5 KiB
4 months ago
|
//===-- ResetMachineFunctionPass.cpp - Reset Machine Function ----*- C++ -*-==//
|
||
|
|
//
|
||
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
||
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
||
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
/// \file
|
||
|
|
/// This file implements a pass that will conditionally reset a machine
|
||
|
|
/// function as if it was just created. This is used to provide a fallback
|
||
|
|
/// mechanism when GlobalISel fails, thus the condition for the reset to
|
||
|
|
/// happen is that the MachineFunction has the FailedISel property.
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
|
||
|
|
#include "llvm/ADT/ScopeExit.h"
|
||
|
|
#include "llvm/ADT/Statistic.h"
|
||
|
|
#include "llvm/CodeGen/MachineFunction.h"
|
||
|
|
#include "llvm/CodeGen/MachineFunctionPass.h"
|
||
|
|
#include "llvm/CodeGen/MachineRegisterInfo.h"
|
||
|
|
#include "llvm/CodeGen/Passes.h"
|
||
|
|
#include "llvm/CodeGen/StackProtector.h"
|
||
|
|
#include "llvm/IR/DiagnosticInfo.h"
|
||
|
|
#include "llvm/InitializePasses.h"
|
||
|
|
#include "llvm/Support/Debug.h"
|
||
|
|
using namespace llvm;
|
||
|
|
|
||
|
|
#define DEBUG_TYPE "reset-machine-function"
|
||
|
|
|
||
|
|
STATISTIC(NumFunctionsReset, "Number of functions reset");
|
||
|
|
STATISTIC(NumFunctionsVisited, "Number of functions visited");
|
||
|
|
|
||
|
|
namespace {
|
||
|
|
class ResetMachineFunction : public MachineFunctionPass {
|
||
|
|
/// Tells whether or not this pass should emit a fallback
|
||
|
|
/// diagnostic when it resets a function.
|
||
|
|
bool EmitFallbackDiag;
|
||
|
|
/// Whether we should abort immediately instead of resetting the function.
|
||
|
|
bool AbortOnFailedISel;
|
||
|
|
|
||
|
|
public:
|
||
|
|
static char ID; // Pass identification, replacement for typeid
|
||
|
|
ResetMachineFunction(bool EmitFallbackDiag = false,
|
||
|
|
bool AbortOnFailedISel = false)
|
||
|
|
: MachineFunctionPass(ID), EmitFallbackDiag(EmitFallbackDiag),
|
||
|
|
AbortOnFailedISel(AbortOnFailedISel) {}
|
||
|
|
|
||
|
|
StringRef getPassName() const override { return "ResetMachineFunction"; }
|
||
|
|
|
||
|
|
void getAnalysisUsage(AnalysisUsage &AU) const override {
|
||
|
|
AU.addPreserved<StackProtector>();
|
||
|
|
MachineFunctionPass::getAnalysisUsage(AU);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool runOnMachineFunction(MachineFunction &MF) override {
|
||
|
|
++NumFunctionsVisited;
|
||
|
|
// No matter what happened, whether we successfully selected the function
|
||
|
|
// or not, nothing is going to use the vreg types after us. Make sure they
|
||
|
|
// disappear.
|
||
|
|
auto ClearVRegTypesOnReturn =
|
||
|
|
make_scope_exit([&MF]() { MF.getRegInfo().clearVirtRegTypes(); });
|
||
|
|
|
||
|
|
if (MF.getProperties().hasProperty(
|
||
|
|
MachineFunctionProperties::Property::FailedISel)) {
|
||
|
|
if (AbortOnFailedISel)
|
||
|
|
report_fatal_error("Instruction selection failed");
|
||
|
|
LLVM_DEBUG(dbgs() << "Resetting: " << MF.getName() << '\n');
|
||
|
|
++NumFunctionsReset;
|
||
|
|
MF.reset();
|
||
|
|
if (EmitFallbackDiag) {
|
||
|
|
const Function &F = MF.getFunction();
|
||
|
|
DiagnosticInfoISelFallback DiagFallback(F);
|
||
|
|
F.getContext().diagnose(DiagFallback);
|
||
|
|
}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
};
|
||
|
|
} // end anonymous namespace
|
||
|
|
|
||
|
|
char ResetMachineFunction::ID = 0;
|
||
|
|
INITIALIZE_PASS(ResetMachineFunction, DEBUG_TYPE,
|
||
|
|
"Reset machine function if ISel failed", false, false)
|
||
|
|
|
||
|
|
MachineFunctionPass *
|
||
|
|
llvm::createResetMachineFunctionPass(bool EmitFallbackDiag = false,
|
||
|
|
bool AbortOnFailedISel = false) {
|
||
|
|
return new ResetMachineFunction(EmitFallbackDiag, AbortOnFailedISel);
|
||
|
|
}
|