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Get PIC jump table working. 

llvm-svn: 58869
This commit is contained in:
Evan Cheng 2008-11-07 22:30:53 +00:00
parent 077f686d4b
commit 8467e2459a
2 changed files with 54 additions and 51 deletions
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89
llvm/lib/Target/ARM/ARMCodeEmitter.cpp
View File

@ -96,6 +96,7 @@ namespace {
const TargetInstrDesc &TID) const;
void emitDataProcessingInstruction(const MachineInstr &MI,
unsigned ImplicitRd = 0,
unsigned ImplicitRn = 0);
void emitLoadStoreInstruction(const MachineInstr &MI,
@ -115,7 +116,7 @@ namespace {
void emitBranchInstruction(const MachineInstr &MI);
void emitInlineJumpTable(unsigned JTIndex, intptr_t JTBase);
void emitInlineJumpTable(unsigned JTIndex);
void emitMiscBranchInstruction(const MachineInstr &MI);
@ -137,16 +138,14 @@ namespace {
unsigned getShiftOp(unsigned Imm) const ;
/// Routines that handle operands which add machine relocations which are
/// fixed up by the JIT fixup stage.
/// fixed up by the relocation stage.
void emitGlobalAddress(GlobalValue *GV, unsigned Reloc,
bool NeedStub);
bool NeedStub, unsigned CPIdx = 0);
void emitExternalSymbolAddress(const char *ES, unsigned Reloc);
void emitConstPoolAddress(unsigned CPI, unsigned Reloc,
int Disp = 0, unsigned PCAdj = 0 );
void emitJumpTableAddress(unsigned JTIndex, unsigned Reloc,
unsigned PCAdj = 0);
void emitGlobalConstant(const Constant *CV);
void emitMachineBasicBlock(MachineBasicBlock *BB, unsigned Reloc);
void emitConstPoolAddress(unsigned CPI, unsigned Reloc);
void emitJumpTableAddress(unsigned JTIndex, unsigned Reloc);
void emitMachineBasicBlock(MachineBasicBlock *BB, unsigned Reloc,
intptr_t JTBase = 0);
};
char ARMCodeEmitter::ID = 0;
}
@ -227,9 +226,10 @@ unsigned ARMCodeEmitter::getMachineOpValue(const MachineInstr &MI,
/// emitGlobalAddress - Emit the specified address to the code stream.
///
void ARMCodeEmitter::emitGlobalAddress(GlobalValue *GV,
unsigned Reloc, bool NeedStub) {
unsigned Reloc, bool NeedStub,
unsigned CPIdx) {
MCE.addRelocation(MachineRelocation::getGV(MCE.getCurrentPCOffset(),
Reloc, GV, 0, NeedStub));
Reloc, GV, CPIdx, NeedStub));
}
/// emitExternalSymbolAddress - Arrange for the address of an external symbol to
@ -243,28 +243,25 @@ void ARMCodeEmitter::emitExternalSymbolAddress(const char *ES, unsigned Reloc) {
/// emitConstPoolAddress - Arrange for the address of an constant pool
/// to be emitted to the current location in the function, and allow it to be PC
/// relative.
void ARMCodeEmitter::emitConstPoolAddress(unsigned CPI, unsigned Reloc,
int Disp /* = 0 */,
unsigned PCAdj /* = 0 */) {
void ARMCodeEmitter::emitConstPoolAddress(unsigned CPI, unsigned Reloc) {
// Tell JIT emitter we'll resolve the address.
MCE.addRelocation(MachineRelocation::getConstPool(MCE.getCurrentPCOffset(),
Reloc, CPI, PCAdj, true));
Reloc, CPI, 0, true));
}
/// emitJumpTableAddress - Arrange for the address of a jump table to
/// be emitted to the current location in the function, and allow it to be PC
/// relative.
void ARMCodeEmitter::emitJumpTableAddress(unsigned JTIndex, unsigned Reloc,
unsigned PCAdj /* = 0 */) {
void ARMCodeEmitter::emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) {
MCE.addRelocation(MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(),
Reloc, JTIndex, PCAdj, true));
Reloc, JTIndex, 0, true));
}
/// emitMachineBasicBlock - Emit the specified address basic block.
void ARMCodeEmitter::emitMachineBasicBlock(MachineBasicBlock *BB,
unsigned Reloc) {
unsigned Reloc, intptr_t JTBase) {
MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
Reloc, BB));
Reloc, BB, JTBase));
}
void ARMCodeEmitter::emitWordLE(unsigned Binary) {
@ -321,8 +318,8 @@ void ARMCodeEmitter::emitInstruction(const MachineInstr &MI) {
}
void ARMCodeEmitter::emitConstPoolInstruction(const MachineInstr &MI) {
unsigned CPI = MI.getOperand(0).getImm();
unsigned CPIndex = MI.getOperand(1).getIndex();
unsigned CPI = MI.getOperand(0).getImm(); // CP instruction index.
unsigned CPIndex = MI.getOperand(1).getIndex(); // Actual cp entry index.
const MachineConstantPoolEntry &MCPE = (*MCPEs)[CPIndex];
// Remember the CONSTPOOL_ENTRY address for later relocation.
@ -335,14 +332,12 @@ void ARMCodeEmitter::emitConstPoolInstruction(const MachineInstr &MI) {
static_cast<ARMConstantPoolValue*>(MCPE.Val.MachineCPVal);
DOUT << " ** ARM constant pool #" << CPI << " @ "
<< (void*)MCE.getCurrentPCValue() << " " << *ACPV << "\n";
<< (void*)MCE.getCurrentPCValue() << " " << *ACPV << '\n';
GlobalValue *GV = ACPV->getGV();
if (GV) {
assert(!ACPV->isStub() && "Don't know how to deal this yet!");
MCE.addRelocation(MachineRelocation::getGV(MCE.getCurrentPCOffset(),
ARM::reloc_arm_machine_cp_entry,
GV, CPIndex, false));
emitGlobalAddress(GV, ARM::reloc_arm_machine_cp_entry, false, CPIndex);
} else {
assert(!ACPV->isNonLazyPointer() && "Don't know how to deal this yet!");
emitExternalSymbolAddress(ACPV->getSymbol(), ARM::reloc_arm_absolute);
@ -352,7 +347,7 @@ void ARMCodeEmitter::emitConstPoolInstruction(const MachineInstr &MI) {
Constant *CV = MCPE.Val.ConstVal;
DOUT << " ** Constant pool #" << CPI << " @ "
<< (void*)MCE.getCurrentPCValue() << " " << *CV << "\n";
<< (void*)MCE.getCurrentPCValue() << " " << *CV << '\n';
if (GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
emitGlobalAddress(GV, ARM::reloc_arm_absolute, false);
@ -454,7 +449,7 @@ void ARMCodeEmitter::emitPseudoInstruction(const MachineInstr &MI) {
// Remember of the address of the PC label for relocation later.
addPCLabel(MI.getOperand(2).getImm());
// PICADD is just an add instruction that implicitly read pc.
emitDataProcessingInstruction(MI, ARM::PC);
emitDataProcessingInstruction(MI, 0, ARM::PC);
break;
}
case ARM::PICLDR:
@ -568,6 +563,7 @@ unsigned ARMCodeEmitter::getAddrModeSBit(const MachineInstr &MI,
}
void ARMCodeEmitter::emitDataProcessingInstruction(const MachineInstr &MI,
unsigned ImplicitRd,
unsigned ImplicitRn) {
const TargetInstrDesc &TID = MI.getDesc();
@ -583,10 +579,12 @@ void ARMCodeEmitter::emitDataProcessingInstruction(const MachineInstr &MI,
// Encode register def if there is one.
unsigned NumDefs = TID.getNumDefs();
unsigned OpIdx = 0;
if (NumDefs) {
Binary |= getMachineOpValue(MI, OpIdx) << ARMII::RegRdShift;
++OpIdx;
}
if (NumDefs)
Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
else if (ImplicitRd)
// Special handling for implicit use (e.g. PC).
Binary |= (ARMRegisterInfo::getRegisterNumbering(ImplicitRd)
<< ARMII::RegRdShift);
// If this is a two-address operand, skip it. e.g. MOVCCr operand 1.
if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
@ -904,17 +902,18 @@ void ARMCodeEmitter::emitBranchInstruction(const MachineInstr &MI) {
emitWordLE(Binary);
}
void ARMCodeEmitter::emitInlineJumpTable(unsigned JTIndex, intptr_t JTBase) {
void ARMCodeEmitter::emitInlineJumpTable(unsigned JTIndex) {
// Remember the base address of the inline jump table.
JTI->addJumpTableBaseAddr(JTIndex, MCE.getCurrentPCValue());
intptr_t JTBase = MCE.getCurrentPCValue();
JTI->addJumpTableBaseAddr(JTIndex, JTBase);
DOUT << " ** Jump Table #" << JTIndex << " @ " << (void*)JTBase << '\n';
// Now emit the jump table entries.
const std::vector<MachineBasicBlock*> &MBBs = (*MJTEs)[JTIndex].MBBs;
for (unsigned i = 0, e = MBBs.size(); i != e; ++i) {
if (IsPIC)
// DestBB address - JT base.
MCE.addRelocation(MachineRelocation::getBB(JTBase, ARM::reloc_arm_pic_jt,
MBBs[i]));
emitMachineBasicBlock(MBBs[i], ARM::reloc_arm_pic_jt, JTBase);
else
// Absolute DestBB address.
emitMachineBasicBlock(MBBs[i], ARM::reloc_arm_absolute);
@ -924,17 +923,23 @@ void ARMCodeEmitter::emitInlineJumpTable(unsigned JTIndex, intptr_t JTBase) {
void ARMCodeEmitter::emitMiscBranchInstruction(const MachineInstr &MI) {
const TargetInstrDesc &TID = MI.getDesc();
if (TID.Opcode == ARM::BX ||
TID.Opcode == ARM::BR_JTr ||
TID.Opcode == ARM::BR_JTadd)
abort(); // FIXME
if (TID.Opcode == ARM::BR_JTm) {
// Handle jump tables.
if (TID.Opcode == ARM::BR_JTr || TID.Opcode == ARM::BR_JTadd) {
// First emit a ldr pc, [] instruction.
emitDataProcessingInstruction(MI, ARM::PC);
// Then emit the inline jump table.
unsigned JTIndex = (TID.Opcode == ARM::BR_JTr)
? MI.getOperand(1).getIndex() : MI.getOperand(2).getIndex();
emitInlineJumpTable(JTIndex);
return;
} else if (TID.Opcode == ARM::BR_JTm) {
// First emit a ldr pc, [] instruction.
emitLoadStoreInstruction(MI, ARM::PC);
// Then emit the inline jump table.
emitInlineJumpTable(MI.getOperand(3).getIndex(), MCE.getCurrentPCOffset());
emitInlineJumpTable(MI.getOperand(3).getIndex());
return;
}

16
llvm/lib/Target/ARM/ARMJITInfo.cpp
View File

@ -170,9 +170,14 @@ void *ARMJITInfo::emitFunctionStub(const Function* F, void *Fn,
intptr_t ARMJITInfo::resolveRelocDestAddr(MachineRelocation *MR) const {
ARM::RelocationType RT = (ARM::RelocationType)MR->getRelocationType();
if (RT == ARM::reloc_arm_jt_base)
if (RT == ARM::reloc_arm_pic_jt)
// Destination address - jump table base.
return (intptr_t)(MR->getResultPointer()) - MR->getConstantVal();
else if (RT == ARM::reloc_arm_jt_base)
// Jump table base address.
return getJumpTableBaseAddr(MR->getJumpTableIndex());
else if (RT == ARM::reloc_arm_cp_entry)
// Constant pool entry address.
return getConstantPoolEntryAddr(MR->getConstantPoolIndex());
else if (RT == ARM::reloc_arm_machine_cp_entry) {
const MachineConstantPoolEntry &MCPE = (*MCPEs)[MR->getConstantVal()];
@ -196,8 +201,6 @@ void ARMJITInfo::relocate(void *Function, MachineRelocation *MR,
unsigned NumRelocs, unsigned char* GOTBase) {
for (unsigned i = 0; i != NumRelocs; ++i, ++MR) {
void *RelocPos = (char*)Function + MR->getMachineCodeOffset();
// If this is a constpool relocation, get the address of the
// constpool_entry instruction.
intptr_t ResultPtr = resolveRelocDestAddr(MR);
switch ((ARM::RelocationType)MR->getRelocationType()) {
case ARM::reloc_arm_cp_entry:
@ -220,6 +223,7 @@ void ARMJITInfo::relocate(void *Function, MachineRelocation *MR,
*((unsigned*)RelocPos) |= 0xF << 16;
break;
}
case ARM::reloc_arm_pic_jt:
case ARM::reloc_arm_machine_cp_entry:
case ARM::reloc_arm_absolute: {
// These addresses have already been resolved.
@ -244,12 +248,6 @@ void ARMJITInfo::relocate(void *Function, MachineRelocation *MR,
*((unsigned*)RelocPos) |= ResultPtr;
break;
}
case ARM::reloc_arm_pic_jt: {
// PIC JT entry is destination - JT base.
ResultPtr = ResultPtr - (intptr_t)RelocPos;
*((unsigned*)RelocPos) |= ResultPtr;
break;
}
}
}
}