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[FastISel] Factor out stackmap intrinsic selection code into a dedicated helper method. NFCI.

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llvm-svn: 212140
This commit is contained in:
Juergen Ributzka 2014-07-01 22:25:49 +00:00
parent 6522771fe6
commit ce04dda8eb
2 changed files with 77 additions and 73 deletions
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1
include/llvm/CodeGen/FastISel.h
View File

@ -387,6 +387,7 @@ private:
bool SelectGetElementPtr(const User *I);
bool SelectStackmap(const CallInst *I);
bool SelectCall(const User *I);
bool SelectBitCast(const User *I);

149
lib/CodeGen/SelectionDAG/FastISel.cpp
View File

@ -561,13 +561,13 @@ bool FastISel::SelectGetElementPtr(const User *I) {
return true;
}
/// \brief Add a stack map intrinsic call's live variable operands to a stackmap
/// or patchpoint machine instruction.
///
/// \brief Add a stackmap or patchpoint intrinsic call's live variable operands
/// to a stackmap or patchpoint machine instruction.
bool FastISel::addStackMapLiveVars(SmallVectorImpl<MachineOperand> &Ops,
const CallInst *CI, unsigned StartIdx) {
for (unsigned i = StartIdx, e = CI->getNumArgOperands(); i != e; ++i) {
Value *Val = CI->getArgOperand(i);
// Check for constants and encode them with a StackMaps::ConstantOp prefix.
if (auto *C = dyn_cast<ConstantInt>(Val)) {
Ops.push_back(MachineOperand::CreateImm(StackMaps::ConstantOp));
Ops.push_back(MachineOperand::CreateImm(C->getSExtValue()));
@ -575,6 +575,9 @@ bool FastISel::addStackMapLiveVars(SmallVectorImpl<MachineOperand> &Ops,
Ops.push_back(MachineOperand::CreateImm(StackMaps::ConstantOp));
Ops.push_back(MachineOperand::CreateImm(0));
} else if (auto *AI = dyn_cast<AllocaInst>(Val)) {
// Values coming from a stack location also require a sepcial encoding,
// but that is added later on by the target specific frame index
// elimination implementation.
auto SI = FuncInfo.StaticAllocaMap.find(AI);
if (SI != FuncInfo.StaticAllocaMap.end())
Ops.push_back(MachineOperand::CreateFI(SI->second));
@ -591,6 +594,74 @@ bool FastISel::addStackMapLiveVars(SmallVectorImpl<MachineOperand> &Ops,
return true;
}
bool FastISel::SelectStackmap(const CallInst *I) {
// void @llvm.experimental.stackmap(i64 <id>, i32 <numShadowBytes>,
// [live variables...])
assert(I->getCalledFunction()->getReturnType()->isVoidTy() &&
"Stackmap cannot return a value.");
// The stackmap intrinsic only records the live variables (the arguments
// passed to it) and emits NOPS (if requested). Unlike the patchpoint
// intrinsic, this won't be lowered to a function call. This means we don't
// have to worry about calling conventions and target-specific lowering code.
// Instead we perform the call lowering right here.
//
// CALLSEQ_START(0)
// STACKMAP(id, nbytes, ...)
// CALLSEQ_END(0, 0)
//
SmallVector<MachineOperand, 32> Ops;
// Add the <id> and <numBytes> constants.
assert(isa<ConstantInt>(I->getOperand(PatchPointOpers::IDPos)) &&
"Expected a constant integer.");
const auto *ID = cast<ConstantInt>(I->getOperand(PatchPointOpers::IDPos));
Ops.push_back(MachineOperand::CreateImm(ID->getZExtValue()));
assert(isa<ConstantInt>(I->getOperand(PatchPointOpers::NBytesPos)) &&
"Expected a constant integer.");
const auto *NumBytes =
cast<ConstantInt>(I->getOperand(PatchPointOpers::NBytesPos));
Ops.push_back(MachineOperand::CreateImm(NumBytes->getZExtValue()));
// Push live variables for the stack map (skipping the first two arguments
// <id> and <numBytes>).
if (!addStackMapLiveVars(Ops, I, 2))
return false;
// We are not adding any register mask info here, because the stackmap doesn't
// clobber anything.
// Add scratch registers as implicit def and early clobber.
CallingConv::ID CC = I->getCallingConv();
const MCPhysReg *ScratchRegs = TLI.getScratchRegisters(CC);
for (unsigned i = 0; ScratchRegs[i]; ++i)
Ops.push_back(MachineOperand::CreateReg(
ScratchRegs[i], /*IsDef=*/true, /*IsImp=*/true, /*IsKill=*/false,
/*IsDead=*/false, /*IsUndef=*/false, /*IsEarlyClobber=*/true));
// Issue CALLSEQ_START
unsigned AdjStackDown = TII.getCallFrameSetupOpcode();
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AdjStackDown))
.addImm(0);
// Issue STACKMAP.
MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
TII.get(TargetOpcode::STACKMAP));
for (auto const &MO : Ops)
MIB.addOperand(MO);
// Issue CALLSEQ_END
unsigned AdjStackUp = TII.getCallFrameDestroyOpcode();
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AdjStackUp))
.addImm(0).addImm(0);
// Inform the Frame Information that we have a stackmap in this function.
FuncInfo.MF->getFrameInfo()->setHasStackMap();
return true;
}
bool FastISel::SelectCall(const User *I) {
const CallInst *Call = cast<CallInst>(I);
@ -746,76 +817,8 @@ bool FastISel::SelectCall(const User *I) {
UpdateValueMap(Call, ResultReg);
return true;
}
case Intrinsic::experimental_stackmap: {
// void @llvm.experimental.stackmap(i64 <id>, i32 <numShadowBytes>,
// [live variables...])
assert(Call->getCalledFunction()->getReturnType()->isVoidTy() &&
"Stackmap cannot return a value.");
// The stackmap intrinsic only records the live variables (the arguments
// passed to it) and emits NOPS (if requested). Unlike the patchpoint
// intrinsic, this won't be lowered to a function call. This means we don't
// have to worry about calling conventions and target-specific lowering
// code. Instead we perform the call lowering right here.
//
// CALLSEQ_START(0)
// STACKMAP(id, nbytes, ...)
// CALLSEQ_END(0, 0)
//
SmallVector<MachineOperand, 32> Ops;
// Add the <id> and <numBytes> constants.
assert(isa<ConstantInt>(Call->getOperand(PatchPointOpers::IDPos)) &&
"Expected a constant integer.");
auto IDVal = cast<ConstantInt>(Call->getOperand(PatchPointOpers::IDPos));
Ops.push_back(MachineOperand::CreateImm(IDVal->getZExtValue()));
assert(isa<ConstantInt>(Call->getOperand(PatchPointOpers::NBytesPos)) &&
"Expected a constant integer.");
auto NBytesVal =
cast<ConstantInt>(Call->getOperand(PatchPointOpers::NBytesPos));
Ops.push_back(MachineOperand::CreateImm(NBytesVal->getZExtValue()));
// Push live variables for the stack map.
if (!addStackMapLiveVars(Ops, Call, 2))
return false;
// We are not adding any register mask info here, because the stackmap
// doesn't clobber anything.
// Add scratch registers as implicit def and early clobber.
CallingConv::ID CC = Call->getCallingConv();
const MCPhysReg *ScratchRegs = TLI.getScratchRegisters(CC);
for (unsigned i = 0; ScratchRegs[i]; ++i)
Ops.push_back(MachineOperand::CreateReg(
ScratchRegs[i], /*IsDef=*/true, /*IsImp=*/true, /*IsKill=*/false,
/*IsDead=*/false, /*IsUndef=*/false, /*IsEarlyClobber=*/true));
// Issue CALLSEQ_START
unsigned AdjStackDown = TII.getCallFrameSetupOpcode();
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AdjStackDown))
.addImm(0);
// Issue STACKMAP.
MachineInstrBuilder MIB;
MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
TII.get(TargetOpcode::STACKMAP));
for (auto const &MO : Ops)
MIB.addOperand(MO);
// Issue CALLSEQ_END
unsigned AdjStackUp = TII.getCallFrameDestroyOpcode();
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AdjStackUp))
.addImm(0).addImm(0);
// Inform the Frame Information that we have a stackmap in this function.
FuncInfo.MF->getFrameInfo()->setHasStackMap();
return true;
}
case Intrinsic::experimental_stackmap:
return SelectStackmap(Call);
}
// Usually, it does not make sense to initialize a value,