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Emit exception handling info for functions which are

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not marked nounwind, or for all functions when -enable-eh
is set, provided the target supports Dwarf EH.

llvm-gcc generates nounwind in the right places; other FEs
will need to do so also.  Given such a FE, -enable-eh should
no longer be needed.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49006 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2008-03-31 23:40:23 +00:00
parent 1d3863fdbc
commit 1544e4713b
8 changed files with 49 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
lib/CodeGen/DwarfWriter.cpp
View File

@ -2778,9 +2778,13 @@ private:
std::vector<FunctionEHFrameInfo> EHFrames;
/// shouldEmit - Flag to indicate if debug information should be emitted.
///
/// shouldEmit - Per-function flag to indicate if EH information should
/// be emitted.
bool shouldEmit;
/// shouldEmitModule - Per-module flag to indicate if EH information should
/// be emitted.
bool shouldEmitModule;
/// EmitCommonEHFrame - Emit the common eh unwind frame.
///
@ -3368,6 +3372,7 @@ public:
DwarfException(std::ostream &OS, AsmPrinter *A, const TargetAsmInfo *T)
: Dwarf(OS, A, T, "eh")
, shouldEmit(false)
, shouldEmitModule(false)
{}
virtual ~DwarfException() {}
@ -3387,7 +3392,7 @@ public:
/// EndModule - Emit all exception information that should come after the
/// content.
void EndModule() {
if (!shouldEmit) return;
if (!shouldEmitModule) return;
const std::vector<Function *> Personalities = MMI->getPersonalities();
for (unsigned i =0; i < Personalities.size(); ++i)
@ -3403,13 +3408,14 @@ public:
void BeginFunction(MachineFunction *MF) {
this->MF = MF;
if (MMI &&
ExceptionHandling &&
shouldEmit = false;
if ((ExceptionHandling || !MF->getFunction()->doesNotThrow()) &&
TAI->doesSupportExceptionHandling()) {
shouldEmit = true;
// Assumes in correct section after the entry point.
EmitLabel("eh_func_begin", ++SubprogramCount);
}
shouldEmitModule |= shouldEmit;
}
/// EndFunction - Gather and emit post-function exception information.

6
lib/CodeGen/LLVMTargetMachine.cpp
View File

@ -66,8 +66,7 @@ LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
PM.add(createGCLoweringPass());
if (!ExceptionHandling)
PM.add(createLowerInvokePass(getTargetLowering()));
PM.add(createLowerInvokePass(getTargetLowering()));
// Make sure that no unreachable blocks are instruction selected.
PM.add(createUnreachableBlockEliminationPass());
@ -192,8 +191,7 @@ bool LLVMTargetMachine::addPassesToEmitMachineCode(PassManagerBase &PM,
PM.add(createGCLoweringPass());
if (!ExceptionHandling)
PM.add(createLowerInvokePass(getTargetLowering()));
PM.add(createLowerInvokePass(getTargetLowering()));
// Make sure that no unreachable blocks are instruction selected.
PM.add(createUnreachableBlockEliminationPass());

21
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
View File

@ -169,6 +169,7 @@ namespace llvm {
Function &Fn;
MachineFunction &MF;
MachineRegisterInfo &RegInfo;
bool needsExceptionHandling;
FunctionLoweringInfo(TargetLowering &TLI, Function &Fn,MachineFunction &MF);
@ -304,6 +305,10 @@ FunctionLoweringInfo::FunctionLoweringInfo(TargetLowering &tli,
BuildMI(MBB, TII->get(TargetInstrInfo::PHI), PHIReg+i);
}
}
// Figure out whether we need to generate EH info. Currently we do this for
// all functions not marked no-unwind, or if requested via -enable-eh.
needsExceptionHandling = ExceptionHandling || !Fn.doesNotThrow();
}
/// CreateRegForValue - Allocate the appropriate number of virtual registers of
@ -2827,7 +2832,7 @@ SelectionDAGLowering::visitIntrinsicCall(CallInst &I, unsigned Intrinsic) {
}
case Intrinsic::eh_exception: {
if (ExceptionHandling) {
if (FuncInfo.needsExceptionHandling) {
if (!CurMBB->isLandingPad()) {
// FIXME: Mark exception register as live in. Hack for PR1508.
unsigned Reg = TLI.getExceptionAddressRegister();
@ -2852,7 +2857,7 @@ SelectionDAGLowering::visitIntrinsicCall(CallInst &I, unsigned Intrinsic) {
MVT::ValueType VT = (Intrinsic == Intrinsic::eh_selector_i32 ?
MVT::i32 : MVT::i64);
if (ExceptionHandling && MMI) {
if (FuncInfo.needsExceptionHandling && MMI) {
if (CurMBB->isLandingPad())
addCatchInfo(I, MMI, CurMBB);
else {
@ -2902,7 +2907,7 @@ SelectionDAGLowering::visitIntrinsicCall(CallInst &I, unsigned Intrinsic) {
case Intrinsic::eh_return: {
MachineModuleInfo *MMI = DAG.getMachineModuleInfo();
if (MMI && ExceptionHandling) {
if (MMI && FuncInfo.needsExceptionHandling) {
MMI->setCallsEHReturn(true);
DAG.setRoot(DAG.getNode(ISD::EH_RETURN,
MVT::Other,
@ -2925,7 +2930,7 @@ SelectionDAGLowering::visitIntrinsicCall(CallInst &I, unsigned Intrinsic) {
}
case Intrinsic::eh_dwarf_cfa: {
if (ExceptionHandling) {
if (FuncInfo.needsExceptionHandling) {
MVT::ValueType VT = getValue(I.getOperand(1)).getValueType();
SDOperand CfaArg;
if (MVT::getSizeInBits(VT) > MVT::getSizeInBits(TLI.getPointerTy()))
@ -3176,7 +3181,7 @@ void SelectionDAGLowering::LowerCallTo(CallSite CS, SDOperand Callee,
Args.push_back(Entry);
}
if (LandingPad && ExceptionHandling && MMI) {
if (LandingPad && FuncInfo.needsExceptionHandling && MMI) {
// Insert a label before the invoke call to mark the try range. This can be
// used to detect deletion of the invoke via the MachineModuleInfo.
BeginLabel = MMI->NextLabelID();
@ -3195,7 +3200,7 @@ void SelectionDAGLowering::LowerCallTo(CallSite CS, SDOperand Callee,
setValue(CS.getInstruction(), Result.first);
DAG.setRoot(Result.second);
if (LandingPad && ExceptionHandling && MMI) {
if (LandingPad && FuncInfo.needsExceptionHandling && MMI) {
// Insert a label at the end of the invoke call to mark the try range. This
// can be used to detect deletion of the invoke via the MachineModuleInfo.
EndLabel = MMI->NextLabelID();
@ -4614,7 +4619,7 @@ bool SelectionDAGISel::runOnFunction(Function &Fn) {
FunctionLoweringInfo FuncInfo(TLI, Fn, MF);
if (ExceptionHandling)
if (FuncInfo.needsExceptionHandling)
for (Function::iterator I = Fn.begin(), E = Fn.end(); I != E; ++I)
if (InvokeInst *Invoke = dyn_cast<InvokeInst>(I->getTerminator()))
// Mark landing pad.
@ -4757,7 +4762,7 @@ void SelectionDAGISel::BuildSelectionDAG(SelectionDAG &DAG, BasicBlock *LLVMBB,
MachineModuleInfo *MMI = DAG.getMachineModuleInfo();
if (ExceptionHandling && MMI && BB->isLandingPad()) {
if (FuncInfo.needsExceptionHandling && MMI && BB->isLandingPad()) {
// Add a label to mark the beginning of the landing pad. Deletion of the
// landing pad can thus be detected via the MachineModuleInfo.
unsigned LabelID = MMI->addLandingPad(BB);

3
lib/Target/PowerPC/PPCAsmPrinter.cpp
View File

@ -1086,8 +1086,9 @@ bool DarwinAsmPrinter::doFinalization(Module &M) {
O << "\n";
if (ExceptionHandling && TAI->doesSupportExceptionHandling() && MMI) {
if (TAI->doesSupportExceptionHandling() && MMI) {
// Add the (possibly multiple) personalities to the set of global values.
// Only referenced functions get into the Personalities list.
const std::vector<Function *>& Personalities = MMI->getPersonalities();
for (std::vector<Function *>::const_iterator I = Personalities.begin(),

7
lib/Target/PowerPC/PPCRegisterInfo.cpp
View File

@ -20,6 +20,7 @@
#include "PPCFrameInfo.h"
#include "PPCSubtarget.h"
#include "llvm/Constants.h"
#include "llvm/Function.h"
#include "llvm/Type.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
@ -946,6 +947,8 @@ PPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
MachineBasicBlock::iterator MBBI = MBB.begin();
MachineFrameInfo *MFI = MF.getFrameInfo();
MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
bool needsFrameInfo = (MMI && MMI->hasDebugInfo()) ||
ExceptionHandling || !MF.getFunction()->doesNotThrow();
// Prepare for frame info.
unsigned FrameLabelId = 0;
@ -1019,7 +1022,7 @@ PPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
unsigned MaxAlign = MFI->getMaxAlignment();
if (MMI && MMI->needsFrameInfo()) {
if (needsFrameInfo) {
// Mark effective beginning of when frame pointer becomes valid.
FrameLabelId = MMI->NextLabelID();
BuildMI(MBB, MBBI, TII.get(PPC::LABEL)).addImm(FrameLabelId).addImm(0);
@ -1095,7 +1098,7 @@ PPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
}
}
if (MMI && MMI->needsFrameInfo()) {
if (needsFrameInfo) {
std::vector<MachineMove> &Moves = MMI->getFrameMoves();
if (NegFrameSize) {

4
lib/Target/X86/X86AsmPrinter.cpp
View File

@ -381,9 +381,9 @@ bool X86SharedAsmPrinter::doFinalization(Module &M) {
O << "\n";
if (ExceptionHandling && TAI->doesSupportExceptionHandling() && MMI &&
!Subtarget->is64Bit()) {
if (TAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
// Add the (possibly multiple) personalities to the set of global values.
// Only referenced functions get into the Personalities list.
const std::vector<Function *>& Personalities = MMI->getPersonalities();
for (std::vector<Function *>::const_iterator I = Personalities.begin(),

8
lib/Target/X86/X86RegisterInfo.cpp
View File

@ -504,6 +504,8 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
MachineBasicBlock::iterator MBBI = MBB.begin();
bool needsFrameInfo = (MMI && MMI->hasDebugInfo()) ||
ExceptionHandling || !Fn->doesNotThrow();
// Prepare for frame info.
unsigned FrameLabelId = 0;
@ -536,7 +538,7 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
.addReg(FramePtr);
NumBytes -= SlotSize;
if (MMI && MMI->needsFrameInfo()) {
if (needsFrameInfo) {
// Mark effective beginning of when frame pointer becomes valid.
FrameLabelId = MMI->NextLabelID();
BuildMI(MBB, MBBI, TII.get(X86::LABEL)).addImm(FrameLabelId).addImm(0);
@ -548,7 +550,7 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
}
unsigned ReadyLabelId = 0;
if (MMI && MMI->needsFrameInfo()) {
if (needsFrameInfo) {
// Mark effective beginning of when frame pointer is ready.
ReadyLabelId = MMI->NextLabelID();
BuildMI(MBB, MBBI, TII.get(X86::LABEL)).addImm(ReadyLabelId).addImm(0);
@ -607,7 +609,7 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
}
}
if (MMI && MMI->needsFrameInfo()) {
if (needsFrameInfo) {
std::vector<MachineMove> &Moves = MMI->getFrameMoves();
const TargetData *TD = MF.getTarget().getTargetData();

9
lib/Transforms/Utils/LowerInvoke.cpp
View File

@ -47,6 +47,9 @@
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetAsmInfo.h"
#include <csetjmp>
#include <set>
using namespace llvm;
@ -592,6 +595,12 @@ bool LowerInvoke::insertExpensiveEHSupport(Function &F) {
}
bool LowerInvoke::runOnFunction(Function &F) {
// If we will be generating exception info, don't do anything here.
if ((ExceptionHandling || !F.doesNotThrow()) &&
TLI &&
TLI->getTargetMachine().getTargetAsmInfo()->
doesSupportExceptionHandling())
return false;
if (ExpensiveEHSupport)
return insertExpensiveEHSupport(F);
else