LLVM 17.0.0git
FuncletLayout.cpp
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1//===-- FuncletLayout.cpp - Contiguously lay out funclets -----------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements basic block placement transformations which result in
10// funclets being contiguous.
11//
12//===----------------------------------------------------------------------===//
16#include "llvm/CodeGen/Passes.h"
18using namespace llvm;
19
20#define DEBUG_TYPE "funclet-layout"
21
22namespace {
23class FuncletLayout : public MachineFunctionPass {
24public:
25 static char ID; // Pass identification, replacement for typeid
26 FuncletLayout() : MachineFunctionPass(ID) {
28 }
29
33 MachineFunctionProperties::Property::NoVRegs);
34 }
35};
36}
37
38char FuncletLayout::ID = 0;
39char &llvm::FuncletLayoutID = FuncletLayout::ID;
41 "Contiguously Lay Out Funclets", false, false)
42
43bool FuncletLayout::runOnMachineFunction(MachineFunction &F) {
44 // Even though this gets information from getEHScopeMembership(), this pass is
45 // only necessary for funclet-based EH personalities, in which these EH scopes
46 // are outlined at the end.
49 if (FuncletMembership.empty())
50 return false;
51
53 auto FuncletX = FuncletMembership.find(&X);
54 auto FuncletY = FuncletMembership.find(&Y);
55 assert(FuncletX != FuncletMembership.end());
56 assert(FuncletY != FuncletMembership.end());
57 return FuncletX->second < FuncletY->second;
58 });
59
60 // Conservatively assume we changed something.
61 return true;
62}
static GCMetadataPrinterRegistry::Add< ErlangGCPrinter > X("erlang", "erlang-compatible garbage collector")
#define DEBUG_TYPE
#define F(x, y, z)
Definition: MD5.cpp:55
static GCMetadataPrinterRegistry::Add< OcamlGCMetadataPrinter > Y("ocaml", "ocaml 3.10-compatible collector")
#define INITIALIZE_PASS(passName, arg, name, cfg, analysis)
Definition: PassSupport.h:38
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
iterator find(const_arg_type_t< KeyT > Val)
Definition: DenseMap.h:150
bool empty() const
Definition: DenseMap.h:98
iterator end()
Definition: DenseMap.h:84
MachineFunctionPass - This class adapts the FunctionPass interface to allow convenient creation of pa...
virtual bool runOnMachineFunction(MachineFunction &MF)=0
runOnMachineFunction - This method must be overloaded to perform the desired machine code transformat...
virtual MachineFunctionProperties getRequiredProperties() const
Properties which a MachineFunction may have at a given point in time.
MachineFunctionProperties & set(Property P)
static PassRegistry * getPassRegistry()
getPassRegistry - Access the global registry object, which is automatically initialized at applicatio...
unsigned ID
LLVM IR allows to use arbitrary numbers as calling convention identifiers.
Definition: CallingConv.h:24
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
char & FuncletLayoutID
This pass lays out funclets contiguously.
void initializeFuncletLayoutPass(PassRegistry &)
DenseMap< const MachineBasicBlock *, int > getEHScopeMembership(const MachineFunction &MF)
Definition: Analysis.cpp:758