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//===-- llvm/CodeGen/MachineModuleInfo.cpp ----------------------*- 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
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DiagnosticInfo.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/InitializePasses.h"
#include "llvm/MC/MCContext.h"
#include "llvm/Pass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetMachine.h"
#include <algorithm>
#include <cassert>
#include <memory>
#include <utility>
#include <vector>
using namespace llvm;
using namespace llvm::dwarf;
static cl::opt<bool>
DisableDebugInfoPrinting("disable-debug-info-print", cl::Hidden,
cl::desc("Disable debug info printing"));
// Out of line virtual method.
MachineModuleInfoImpl::~MachineModuleInfoImpl() = default;
void MachineModuleInfo::initialize() {
ObjFileMMI = nullptr;
CurCallSite = 0;
NextFnNum = 0;
UsesMSVCFloatingPoint = false;
DbgInfoAvailable = false;
}
void MachineModuleInfo::finalize() {
Context.reset();
// We don't clear the ExternalContext.
delete ObjFileMMI;
ObjFileMMI = nullptr;
}
MachineModuleInfo::MachineModuleInfo(MachineModuleInfo &&MMI)
: TM(std::move(MMI.TM)),
Context(MMI.TM.getTargetTriple(), MMI.TM.getMCAsmInfo(),
MMI.TM.getMCRegisterInfo(), MMI.TM.getMCSubtargetInfo(), nullptr,
&MMI.TM.Options.MCOptions, false),
MachineFunctions(std::move(MMI.MachineFunctions)) {
Context.setObjectFileInfo(MMI.TM.getObjFileLowering());
ObjFileMMI = MMI.ObjFileMMI;
CurCallSite = MMI.CurCallSite;
ExternalContext = MMI.ExternalContext;
TheModule = MMI.TheModule;
}
MachineModuleInfo::MachineModuleInfo(const LLVMTargetMachine *TM)
: TM(*TM), Context(TM->getTargetTriple(), TM->getMCAsmInfo(),
TM->getMCRegisterInfo(), TM->getMCSubtargetInfo(),
nullptr, &TM->Options.MCOptions, false) {
Context.setObjectFileInfo(TM->getObjFileLowering());
initialize();
}
MachineModuleInfo::MachineModuleInfo(const LLVMTargetMachine *TM,
MCContext *ExtContext)
: TM(*TM), Context(TM->getTargetTriple(), TM->getMCAsmInfo(),
TM->getMCRegisterInfo(), TM->getMCSubtargetInfo(),
nullptr, &TM->Options.MCOptions, false),
ExternalContext(ExtContext) {
Context.setObjectFileInfo(TM->getObjFileLowering());
initialize();
}
MachineModuleInfo::~MachineModuleInfo() { finalize(); }
MachineFunction *
MachineModuleInfo::getMachineFunction(const Function &F) const {
auto I = MachineFunctions.find(&F);
return I != MachineFunctions.end() ? I->second.get() : nullptr;
}
MachineFunction &MachineModuleInfo::getOrCreateMachineFunction(Function &F) {
// Shortcut for the common case where a sequence of MachineFunctionPasses
// all query for the same Function.
if (LastRequest == &F)
return *LastResult;
auto I = MachineFunctions.insert(
std::make_pair(&F, std::unique_ptr<MachineFunction>()));
MachineFunction *MF;
if (I.second) {
// No pre-existing machine function, create a new one.
const TargetSubtargetInfo &STI = *TM.getSubtargetImpl(F);
MF = new MachineFunction(F, TM, STI, NextFnNum++, *this);
MF->initTargetMachineFunctionInfo(STI);
// Update the set entry.
I.first->second.reset(MF);
} else {
MF = I.first->second.get();
}
LastRequest = &F;
LastResult = MF;
return *MF;
}
void MachineModuleInfo::deleteMachineFunctionFor(Function &F) {
MachineFunctions.erase(&F);
LastRequest = nullptr;
LastResult = nullptr;
}
void MachineModuleInfo::insertFunction(const Function &F,
std::unique_ptr<MachineFunction> &&MF) {
auto I = MachineFunctions.insert(std::make_pair(&F, std::move(MF)));
assert(I.second && "machine function already mapped");
(void)I;
}
namespace {
/// This pass frees the MachineFunction object associated with a Function.
class FreeMachineFunction : public FunctionPass {
public:
static char ID;
FreeMachineFunction() : FunctionPass(ID) {}
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addRequired<MachineModuleInfoWrapperPass>();
AU.addPreserved<MachineModuleInfoWrapperPass>();
}
bool runOnFunction(Function &F) override {
MachineModuleInfo &MMI =
getAnalysis<MachineModuleInfoWrapperPass>().getMMI();
MMI.deleteMachineFunctionFor(F);
return true;
}
StringRef getPassName() const override {
return "Free MachineFunction";
}
};
} // end anonymous namespace
char FreeMachineFunction::ID;
FunctionPass *llvm::createFreeMachineFunctionPass() {
return new FreeMachineFunction();
}
MachineModuleInfoWrapperPass::MachineModuleInfoWrapperPass(
const LLVMTargetMachine *TM)
: ImmutablePass(ID), MMI(TM) {
initializeMachineModuleInfoWrapperPassPass(*PassRegistry::getPassRegistry());
}
MachineModuleInfoWrapperPass::MachineModuleInfoWrapperPass(
const LLVMTargetMachine *TM, MCContext *ExtContext)
: ImmutablePass(ID), MMI(TM, ExtContext) {
initializeMachineModuleInfoWrapperPassPass(*PassRegistry::getPassRegistry());
}
// Handle the Pass registration stuff necessary to use DataLayout's.
INITIALIZE_PASS(MachineModuleInfoWrapperPass, "machinemoduleinfo",
"Machine Module Information", false, false)
char MachineModuleInfoWrapperPass::ID = 0;
static unsigned getLocCookie(const SMDiagnostic &SMD, const SourceMgr &SrcMgr,
std::vector<const MDNode *> &LocInfos) {
// Look up a LocInfo for the buffer this diagnostic is coming from.
unsigned BufNum = SrcMgr.FindBufferContainingLoc(SMD.getLoc());
const MDNode *LocInfo = nullptr;
if (BufNum > 0 && BufNum <= LocInfos.size())
LocInfo = LocInfos[BufNum - 1];
// If the inline asm had metadata associated with it, pull out a location
// cookie corresponding to which line the error occurred on.
unsigned LocCookie = 0;
if (LocInfo) {
unsigned ErrorLine = SMD.getLineNo() - 1;
if (ErrorLine >= LocInfo->getNumOperands())
ErrorLine = 0;
if (LocInfo->getNumOperands() != 0)
if (const ConstantInt *CI =
mdconst::dyn_extract<ConstantInt>(LocInfo->getOperand(ErrorLine)))
LocCookie = CI->getZExtValue();
}
return LocCookie;
}
bool MachineModuleInfoWrapperPass::doInitialization(Module &M) {
MMI.initialize();
MMI.TheModule = &M;
// FIXME: Do this for new pass manager.
LLVMContext &Ctx = M.getContext();
MMI.getContext().setDiagnosticHandler(
[&Ctx, &M](const SMDiagnostic &SMD, bool IsInlineAsm,
const SourceMgr &SrcMgr,
std::vector<const MDNode *> &LocInfos) {
unsigned LocCookie = 0;
if (IsInlineAsm)
LocCookie = getLocCookie(SMD, SrcMgr, LocInfos);
Ctx.diagnose(
DiagnosticInfoSrcMgr(SMD, M.getName(), IsInlineAsm, LocCookie));
});
MMI.DbgInfoAvailable = !DisableDebugInfoPrinting &&
!M.debug_compile_units().empty();
return false;
}
bool MachineModuleInfoWrapperPass::doFinalization(Module &M) {
MMI.finalize();
return false;
}
AnalysisKey MachineModuleAnalysis::Key;
MachineModuleInfo MachineModuleAnalysis::run(Module &M,
ModuleAnalysisManager &) {
MachineModuleInfo MMI(TM);
MMI.TheModule = &M;
MMI.DbgInfoAvailable = !DisableDebugInfoPrinting &&
!M.debug_compile_units().empty();
return MMI;
}
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