forked from OSchip/llvm-project
63 lines
2.2 KiB
C++
63 lines
2.2 KiB
C++
//===-- FuncletLayout.cpp - Contiguously lay out funclets -----------------===//
|
|
//
|
|
// 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements basic block placement transformations which result in
|
|
// funclets being contiguous.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
#include "llvm/CodeGen/Analysis.h"
|
|
#include "llvm/CodeGen/MachineFunction.h"
|
|
#include "llvm/CodeGen/MachineFunctionPass.h"
|
|
#include "llvm/CodeGen/Passes.h"
|
|
#include "llvm/InitializePasses.h"
|
|
using namespace llvm;
|
|
|
|
#define DEBUG_TYPE "funclet-layout"
|
|
|
|
namespace {
|
|
class FuncletLayout : public MachineFunctionPass {
|
|
public:
|
|
static char ID; // Pass identification, replacement for typeid
|
|
FuncletLayout() : MachineFunctionPass(ID) {
|
|
initializeFuncletLayoutPass(*PassRegistry::getPassRegistry());
|
|
}
|
|
|
|
bool runOnMachineFunction(MachineFunction &F) override;
|
|
MachineFunctionProperties getRequiredProperties() const override {
|
|
return MachineFunctionProperties().set(
|
|
MachineFunctionProperties::Property::NoVRegs);
|
|
}
|
|
};
|
|
}
|
|
|
|
char FuncletLayout::ID = 0;
|
|
char &llvm::FuncletLayoutID = FuncletLayout::ID;
|
|
INITIALIZE_PASS(FuncletLayout, DEBUG_TYPE,
|
|
"Contiguously Lay Out Funclets", false, false)
|
|
|
|
bool FuncletLayout::runOnMachineFunction(MachineFunction &F) {
|
|
// Even though this gets information from getEHScopeMembership(), this pass is
|
|
// only necessary for funclet-based EH personalities, in which these EH scopes
|
|
// are outlined at the end.
|
|
DenseMap<const MachineBasicBlock *, int> FuncletMembership =
|
|
getEHScopeMembership(F);
|
|
if (FuncletMembership.empty())
|
|
return false;
|
|
|
|
F.sort([&](MachineBasicBlock &X, MachineBasicBlock &Y) {
|
|
auto FuncletX = FuncletMembership.find(&X);
|
|
auto FuncletY = FuncletMembership.find(&Y);
|
|
assert(FuncletX != FuncletMembership.end());
|
|
assert(FuncletY != FuncletMembership.end());
|
|
return FuncletX->second < FuncletY->second;
|
|
});
|
|
|
|
// Conservatively assume we changed something.
|
|
return true;
|
|
}
|