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Add support for C++ exception handling.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132131 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka 2011-05-26 18:59:03 +00:00
parent 32bfb2c513
commit cf0cd8005c
7 changed files with 76 additions and 21 deletions
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14
lib/Target/Mips/MipsEmitGPRestore.cpp
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@ -55,6 +55,20 @@ bool Inserter::runOnMachineFunction(MachineFunction &F) {
MachineBasicBlock& MBB = *MFI;
MachineBasicBlock::iterator I = MFI->begin();
// If MBB is a landing pad, insert instruction that restores $gp after
// EH_LABEL.
if (MBB.isLandingPad()) {
// Find EH_LABEL first.
for (; I->getOpcode() != TargetOpcode::EH_LABEL; ++I) ;
// Insert lw.
++I;
DebugLoc dl = I != MBB.end() ? I->getDebugLoc() : DebugLoc();
BuildMI(MBB, I, dl, TII->get(Mips::LW), Mips::GP).addImm(0)
.addFrameIndex(FI);
Changed = true;
}
while (I != MFI->end()) {
if (I->getOpcode() != Mips::JALR) {
++I;

38
lib/Target/Mips/MipsFrameLowering.cpp
View File

@ -182,8 +182,6 @@ void MipsFrameLowering::emitPrologue(MachineFunction &MF) const {
if (ATUsed)
BuildMI(MBB, MBBI, dl, TII.get(Mips::ATMACRO));
// if framepointer enabled, set it to point to the stack pointer.
if (hasFP(MF)) {
// Find the instruction past the last instruction that saves a callee-saved
// register to the stack.
const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
@ -191,15 +189,42 @@ void MipsFrameLowering::emitPrologue(MachineFunction &MF) const {
for (unsigned i = 0; i < CSI.size(); ++i)
++MBBI;
// if framepointer enabled, set it to point to the stack pointer.
if (hasFP(MF))
// Insert instruction "move $fp, $sp" at this location.
BuildMI(MBB, MBBI, dl, TII.get(Mips::ADDu), Mips::FP)
.addReg(Mips::SP).addReg(Mips::ZERO);
}
// Restore GP from the saved stack location
if (MipsFI->needGPSaveRestore())
BuildMI(MBB, MBBI, dl, TII.get(Mips::CPRESTORE))
.addImm(MFI->getObjectOffset(MipsFI->getGPFI()));
// EH Frame infomation.
MachineModuleInfo &MMI = MF.getMMI();
std::vector<MachineMove> &Moves = MMI.getFrameMoves();
MCSymbol *FrameLabel = MMI.getContext().CreateTempSymbol();
BuildMI(MBB, MBBI, dl, TII.get(TargetOpcode::PROLOG_LABEL)).addSym(FrameLabel);
if (hasFP(MF)) {
MachineLocation SPDst(Mips::FP);
MachineLocation SPSrc(Mips::SP);
Moves.push_back(MachineMove(FrameLabel, SPDst, SPSrc));
}
if (StackSize) {
MachineLocation SPDst(MachineLocation::VirtualFP);
MachineLocation SPSrc(MachineLocation::VirtualFP, -StackSize);
Moves.push_back(MachineMove(FrameLabel, SPDst, SPSrc));
}
for (std::vector<CalleeSavedInfo>::const_iterator I = CSI.begin(),
E = CSI.end(); I != E; ++I) {
int64_t Offset = MFI->getObjectOffset(I->getFrameIdx());
MachineLocation CSDst(MachineLocation::VirtualFP, Offset);
MachineLocation CSSrc(I->getReg());
Moves.push_back(MachineMove(FrameLabel, CSDst, CSSrc));
}
}
void MipsFrameLowering::emitEpilogue(MachineFunction &MF,
@ -243,6 +268,13 @@ void MipsFrameLowering::emitEpilogue(MachineFunction &MF,
}
}
void
MipsFrameLowering::getInitialFrameState(std::vector<MachineMove> &Moves) const {
MachineLocation Dst(MachineLocation::VirtualFP);
MachineLocation Src(Mips::SP, 0);
Moves.push_back(MachineMove(0, Dst, Src));
}
void MipsFrameLowering::
processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
RegScavenger *RS) const {

2
lib/Target/Mips/MipsFrameLowering.h
View File

@ -39,6 +39,8 @@ public:
bool hasFP(const MachineFunction &MF) const;
void getInitialFrameState(std::vector<MachineMove> &Moves) const;
void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
RegScavenger *RS) const;
};

6
lib/Target/Mips/MipsISelLowering.cpp
View File

@ -141,7 +141,8 @@ MipsTargetLowering(MipsTargetMachine &TM)
setOperationAction(ISD::FLOG10, MVT::f32, Expand);
setOperationAction(ISD::FEXP, MVT::f32, Expand);
setOperationAction(ISD::EH_LABEL, MVT::Other, Expand);
setOperationAction(ISD::EXCEPTIONADDR, MVT::i32, Expand);
setOperationAction(ISD::EHSELECTION, MVT::i32, Expand);
setOperationAction(ISD::VAARG, MVT::Other, Expand);
setOperationAction(ISD::VACOPY, MVT::Other, Expand);
@ -176,6 +177,9 @@ MipsTargetLowering(MipsTargetMachine &TM)
setStackPointerRegisterToSaveRestore(Mips::SP);
computeRegisterProperties();
setExceptionPointerRegister(Mips::A0);
setExceptionSelectorRegister(Mips::A1);
}
MVT::SimpleValueType MipsTargetLowering::getSetCCResultType(EVT VT) const {

6
lib/Target/Mips/MipsMCAsmInfo.cpp
View File

@ -17,11 +17,15 @@ using namespace llvm;
MipsMCAsmInfo::MipsMCAsmInfo(const Target &T, StringRef TT) {
AlignmentIsInBytes = false;
Data16bitsDirective = "\t.half\t";
Data32bitsDirective = "\t.word\t";
Data32bitsDirective = "\t.4byte\t";
Data64bitsDirective = 0;
PrivateGlobalPrefix = "$";
CommentString = "#";
ZeroDirective = "\t.space\t";
GPRel32Directive = "\t.gpword\t";
WeakRefDirective = "\t.weak\t";
SupportsDebugInformation = true;
ExceptionsType = ExceptionHandling::DwarfCFI;
HasLEB128 = true;
}

3
lib/Target/Mips/MipsRegisterInfo.cpp
View File

@ -283,8 +283,7 @@ getEHHandlerRegister() const {
int MipsRegisterInfo::
getDwarfRegNum(unsigned RegNum, bool isEH) const {
llvm_unreachable("What is the dwarf register number");
return -1;
return MipsGenRegisterInfo::getDwarfRegNumFull(RegNum, 0);
}
#include "MipsGenRegisterInfo.inc"

16
test/CodeGen/Mips/blockaddr.ll
View File

@ -8,14 +8,14 @@ entry:
ret i8* %x
}
; CHECK-PIC: lw $[[R0:[0-9]+]], %got($tmp1)($gp)
; CHECK-PIC: addiu ${{[0-9]+}}, $[[R0]], %lo($tmp1)
; CHECK-PIC: lw $[[R1:[0-9]+]], %got($tmp2)($gp)
; CHECK-PIC: addiu ${{[0-9]+}}, $[[R1]], %lo($tmp2)
; CHECK-STATIC: lui $[[R2:[0-9]+]], %hi($tmp1)
; CHECK-STATIC: addiu ${{[0-9]+}}, $[[R2]], %lo($tmp1)
; CHECK-STATIC: lui $[[R3:[0-9]+]], %hi($tmp2)
; CHECK-STATIC: addiu ${{[0-9]+}}, $[[R3]], %lo($tmp2)
; CHECK-PIC: lw $[[R0:[0-9]+]], %got($tmp[[T0:[0-9]+]])($gp)
; CHECK-PIC: addiu ${{[0-9]+}}, $[[R0]], %lo($tmp[[T0]])
; CHECK-PIC: lw $[[R1:[0-9]+]], %got($tmp[[T1:[0-9]+]])($gp)
; CHECK-PIC: addiu ${{[0-9]+}}, $[[R1]], %lo($tmp[[T1]])
; CHECK-STATIC: lui $[[R2:[0-9]+]], %hi($tmp[[T0:[0-9]+]])
; CHECK-STATIC: addiu ${{[0-9]+}}, $[[R2]], %lo($tmp[[T0]])
; CHECK-STATIC: lui $[[R3:[0-9]+]], %hi($tmp[[T1:[0-9]+]])
; CHECK-STATIC: addiu ${{[0-9]+}}, $[[R3]], %lo($tmp[[T1]])
define void @f() nounwind {
entry:
%call = tail call i8* @dummy(i8* blockaddress(@f, %baz))