1 //===-- ResetMachineFunctionPass.cpp - Reset Machine Function ----*- C++ -*-==//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 /// This file implements a pass that will conditionally reset a machine
11 /// function as if it was just created. This is used to provide a fallback
12 /// mechanism when GlobalISel fails, thus the condition for the reset to
13 /// happen is that the MachineFunction has the FailedISel property.
14 //===----------------------------------------------------------------------===//
16 #include "llvm/ADT/Statistic.h"
17 #include "llvm/CodeGen/Passes.h"
18 #include "llvm/CodeGen/MachineFunction.h"
19 #include "llvm/CodeGen/MachineFunctionPass.h"
20 #include "llvm/IR/DiagnosticInfo.h"
21 #include "llvm/Support/Debug.h"
24 #define DEBUG_TYPE "reset-machine-function"
26 STATISTIC(NumFunctionsReset, "Number of functions reset");
29 class ResetMachineFunction : public MachineFunctionPass {
30 /// Tells whether or not this pass should emit a fallback
31 /// diagnostic when it resets a function.
32 bool EmitFallbackDiag;
33 /// Whether we should abort immediately instead of resetting the function.
34 bool AbortOnFailedISel;
37 static char ID; // Pass identification, replacement for typeid
38 ResetMachineFunction(bool EmitFallbackDiag = false,
39 bool AbortOnFailedISel = false)
40 : MachineFunctionPass(ID), EmitFallbackDiag(EmitFallbackDiag),
41 AbortOnFailedISel(AbortOnFailedISel) {}
43 StringRef getPassName() const override { return "ResetMachineFunction"; }
45 bool runOnMachineFunction(MachineFunction &MF) override {
46 if (MF.getProperties().hasProperty(
47 MachineFunctionProperties::Property::FailedISel)) {
48 if (AbortOnFailedISel)
49 report_fatal_error("Instruction selection failed");
50 DEBUG(dbgs() << "Reseting: " << MF.getName() << '\n');
53 if (EmitFallbackDiag) {
54 const Function &F = *MF.getFunction();
55 DiagnosticInfoISelFallback DiagFallback(F);
56 F.getContext().diagnose(DiagFallback);
64 } // end anonymous namespace
66 char ResetMachineFunction::ID = 0;
67 INITIALIZE_PASS(ResetMachineFunction, DEBUG_TYPE,
68 "reset machine function if ISel failed", false, false)
71 llvm::createResetMachineFunctionPass(bool EmitFallbackDiag = false,
72 bool AbortOnFailedISel = false) {
73 return new ResetMachineFunction(EmitFallbackDiag, AbortOnFailedISel);