// This pass must be run after register allocation. After this pass is
// executed, it is illegal to construct MO_FrameIndex operands.
//
-// This pass provides an optional shrink wrapping variant of prolog/epilog
-// insertion, enabled via --shrink-wrap. See ShrinkWrapping.cpp.
-//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "pei"
-#include "PrologEpilogInserter.h"
#include "llvm/ADT/IndexedMap.h"
#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineLoopInfo.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/RegisterScavenging.h"
+#include "llvm/CodeGen/StackProtector.h"
+#include "llvm/CodeGen/WinEHFuncInfo.h"
+#include "llvm/IR/DiagnosticInfo.h"
#include "llvm/IR/InlineAsm.h"
+#include "llvm/IR/LLVMContext.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Target/TargetSubtargetInfo.h"
#include <climits>
using namespace llvm;
+#define DEBUG_TYPE "pei"
+
+namespace {
+class PEI : public MachineFunctionPass {
+public:
+ static char ID;
+ PEI() : MachineFunctionPass(ID) {
+ initializePEIPass(*PassRegistry::getPassRegistry());
+ }
+
+ void getAnalysisUsage(AnalysisUsage &AU) const override;
+
+ /// runOnMachineFunction - Insert prolog/epilog code and replace abstract
+ /// frame indexes with appropriate references.
+ ///
+ bool runOnMachineFunction(MachineFunction &Fn) override;
+
+private:
+ RegScavenger *RS;
+
+ // MinCSFrameIndex, MaxCSFrameIndex - Keeps the range of callee saved
+ // stack frame indexes.
+ unsigned MinCSFrameIndex, MaxCSFrameIndex;
+
+ // Save and Restore blocks of the current function.
+ MachineBasicBlock *SaveBlock;
+ SmallVector<MachineBasicBlock *, 4> RestoreBlocks;
+
+ // Flag to control whether to use the register scavenger to resolve
+ // frame index materialization registers. Set according to
+ // TRI->requiresFrameIndexScavenging() for the current function.
+ bool FrameIndexVirtualScavenging;
+
+ void calculateSets(MachineFunction &Fn);
+ void calculateCallsInformation(MachineFunction &Fn);
+ void calculateCalleeSavedRegisters(MachineFunction &Fn);
+ void insertCSRSpillsAndRestores(MachineFunction &Fn);
+ void calculateFrameObjectOffsets(MachineFunction &Fn);
+ void replaceFrameIndices(MachineFunction &Fn);
+ void replaceFrameIndices(MachineBasicBlock *BB, MachineFunction &Fn,
+ int &SPAdj);
+ void scavengeFrameVirtualRegs(MachineFunction &Fn);
+ void insertPrologEpilogCode(MachineFunction &Fn);
+
+ // Convenience for recognizing return blocks.
+ bool isReturnBlock(MachineBasicBlock *MBB);
+};
+} // namespace
+
char PEI::ID = 0;
char &llvm::PrologEpilogCodeInserterID = PEI::ID;
"Prologue/Epilogue Insertion", false, false)
INITIALIZE_PASS_DEPENDENCY(MachineLoopInfo)
INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree)
+INITIALIZE_PASS_DEPENDENCY(StackProtector)
INITIALIZE_PASS_DEPENDENCY(TargetPassConfig)
INITIALIZE_PASS_END(PEI, "prologepilog",
"Prologue/Epilogue Insertion & Frame Finalization",
STATISTIC(NumBytesStackSpace,
"Number of bytes used for stack in all functions");
+void PEI::getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.setPreservesCFG();
+ AU.addPreserved<MachineLoopInfo>();
+ AU.addPreserved<MachineDominatorTree>();
+ AU.addRequired<StackProtector>();
+ AU.addRequired<TargetPassConfig>();
+ MachineFunctionPass::getAnalysisUsage(AU);
+}
+
+bool PEI::isReturnBlock(MachineBasicBlock* MBB) {
+ return (MBB && !MBB->empty() && MBB->back().isReturn());
+}
+
+/// Compute the set of return blocks
+void PEI::calculateSets(MachineFunction &Fn) {
+ const MachineFrameInfo *MFI = Fn.getFrameInfo();
+
+ // Even when we do not change any CSR, we still want to insert the
+ // prologue and epilogue of the function.
+ // So set the save points for those.
+
+ // Use the points found by shrink-wrapping, if any.
+ if (MFI->getSavePoint()) {
+ SaveBlock = MFI->getSavePoint();
+ assert(MFI->getRestorePoint() && "Both restore and save must be set");
+ RestoreBlocks.push_back(MFI->getRestorePoint());
+ return;
+ }
+
+ // Save refs to entry and return blocks.
+ SaveBlock = Fn.begin();
+ for (MachineFunction::iterator MBB = Fn.begin(), E = Fn.end();
+ MBB != E; ++MBB)
+ if (isReturnBlock(MBB))
+ RestoreBlocks.push_back(MBB);
+
+ return;
+}
+
+/// StackObjSet - A set of stack object indexes
+typedef SmallSetVector<int, 8> StackObjSet;
+
/// runOnMachineFunction - Insert prolog/epilog code and replace abstract
/// frame indexes with appropriate references.
///
bool PEI::runOnMachineFunction(MachineFunction &Fn) {
const Function* F = Fn.getFunction();
- const TargetRegisterInfo *TRI = Fn.getTarget().getRegisterInfo();
- const TargetFrameLowering *TFI = Fn.getTarget().getFrameLowering();
+ const TargetRegisterInfo *TRI = Fn.getSubtarget().getRegisterInfo();
+ const TargetFrameLowering *TFI = Fn.getSubtarget().getFrameLowering();
assert(!Fn.getRegInfo().getNumVirtRegs() && "Regalloc must assign all vregs");
- RS = TRI->requiresRegisterScavenging(Fn) ? new RegScavenger() : NULL;
+ RS = TRI->requiresRegisterScavenging(Fn) ? new RegScavenger() : nullptr;
FrameIndexVirtualScavenging = TRI->requiresFrameIndexScavenging(Fn);
// Calculate the MaxCallFrameSize and AdjustsStack variables for the
calculateCalleeSavedRegisters(Fn);
// Determine placement of CSR spill/restore code:
- // - With shrink wrapping, place spills and restores to tightly
- // enclose regions in the Machine CFG of the function where
- // they are used.
- // - Without shink wrapping (default), place all spills in the
- // entry block, all restores in return blocks.
- placeCSRSpillsAndRestores(Fn);
+ // place all spills in the entry block, all restores in return blocks.
+ calculateSets(Fn);
// Add the code to save and restore the callee saved registers
if (!F->hasFnAttribute(Attribute::Naked))
replaceFrameIndices(Fn);
// If register scavenging is needed, as we've enabled doing it as a
- // post-pass, scavenge the virtual registers that frame index elimiation
+ // post-pass, scavenge the virtual registers that frame index elimination
// inserted.
if (TRI->requiresRegisterScavenging(Fn) && FrameIndexVirtualScavenging)
scavengeFrameVirtualRegs(Fn);
// Warn on stack size when we exceeds the given limit.
MachineFrameInfo *MFI = Fn.getFrameInfo();
- if (WarnStackSize.getNumOccurrences() > 0 &&
- WarnStackSize < MFI->getStackSize())
- errs() << "warning: Stack size limit exceeded (" << MFI->getStackSize()
- << ") in " << Fn.getName() << ".\n";
+ uint64_t StackSize = MFI->getStackSize();
+ if (WarnStackSize.getNumOccurrences() > 0 && WarnStackSize < StackSize) {
+ DiagnosticInfoStackSize DiagStackSize(*F, StackSize);
+ F->getContext().diagnose(DiagStackSize);
+ }
delete RS;
- clearAllSets();
+ RestoreBlocks.clear();
return true;
}
/// variables for the function's frame information and eliminate call frame
/// pseudo instructions.
void PEI::calculateCallsInformation(MachineFunction &Fn) {
- const TargetInstrInfo &TII = *Fn.getTarget().getInstrInfo();
- const TargetFrameLowering *TFI = Fn.getTarget().getFrameLowering();
+ const TargetInstrInfo &TII = *Fn.getSubtarget().getInstrInfo();
+ const TargetFrameLowering *TFI = Fn.getSubtarget().getFrameLowering();
MachineFrameInfo *MFI = Fn.getFrameInfo();
unsigned MaxCallFrameSize = 0;
/// calculateCalleeSavedRegisters - Scan the function for modified callee saved
/// registers.
void PEI::calculateCalleeSavedRegisters(MachineFunction &F) {
- const TargetRegisterInfo *RegInfo = F.getTarget().getRegisterInfo();
- const TargetFrameLowering *TFI = F.getTarget().getFrameLowering();
+ const TargetRegisterInfo *RegInfo = F.getSubtarget().getRegisterInfo();
+ const TargetFrameLowering *TFI = F.getSubtarget().getFrameLowering();
MachineFrameInfo *MFI = F.getFrameInfo();
// Get the callee saved register list...
- const uint16_t *CSRegs = RegInfo->getCalleeSavedRegs(&F);
+ const MCPhysReg *CSRegs = RegInfo->getCalleeSavedRegs(&F);
// These are used to keep track the callee-save area. Initialize them.
MinCSFrameIndex = INT_MAX;
MaxCSFrameIndex = 0;
// Early exit for targets which have no callee saved registers.
- if (CSRegs == 0 || CSRegs[0] == 0)
+ if (!CSRegs || CSRegs[0] == 0)
return;
// In Naked functions we aren't going to save any registers.
}
}
- if (CSI.empty())
- return; // Early exit if no callee saved registers are modified!
+ if (!TFI->assignCalleeSavedSpillSlots(F, RegInfo, CSI)) {
+ // If target doesn't implement this, use generic code.
+
+ if (CSI.empty())
+ return; // Early exit if no callee saved registers are modified!
+
+ unsigned NumFixedSpillSlots;
+ const TargetFrameLowering::SpillSlot *FixedSpillSlots =
+ TFI->getCalleeSavedSpillSlots(NumFixedSpillSlots);
- unsigned NumFixedSpillSlots;
- const TargetFrameLowering::SpillSlot *FixedSpillSlots =
- TFI->getCalleeSavedSpillSlots(NumFixedSpillSlots);
+ // Now that we know which registers need to be saved and restored, allocate
+ // stack slots for them.
+ for (std::vector<CalleeSavedInfo>::iterator I = CSI.begin(), E = CSI.end();
+ I != E; ++I) {
+ unsigned Reg = I->getReg();
+ const TargetRegisterClass *RC = RegInfo->getMinimalPhysRegClass(Reg);
- // Now that we know which registers need to be saved and restored, allocate
- // stack slots for them.
- for (std::vector<CalleeSavedInfo>::iterator
- I = CSI.begin(), E = CSI.end(); I != E; ++I) {
- unsigned Reg = I->getReg();
- const TargetRegisterClass *RC = RegInfo->getMinimalPhysRegClass(Reg);
+ int FrameIdx;
+ if (RegInfo->hasReservedSpillSlot(F, Reg, FrameIdx)) {
+ I->setFrameIdx(FrameIdx);
+ continue;
+ }
+
+ // Check to see if this physreg must be spilled to a particular stack slot
+ // on this target.
+ const TargetFrameLowering::SpillSlot *FixedSlot = FixedSpillSlots;
+ while (FixedSlot != FixedSpillSlots + NumFixedSpillSlots &&
+ FixedSlot->Reg != Reg)
+ ++FixedSlot;
+
+ if (FixedSlot == FixedSpillSlots + NumFixedSpillSlots) {
+ // Nope, just spill it anywhere convenient.
+ unsigned Align = RC->getAlignment();
+ unsigned StackAlign = TFI->getStackAlignment();
+
+ // We may not be able to satisfy the desired alignment specification of
+ // the TargetRegisterClass if the stack alignment is smaller. Use the
+ // min.
+ Align = std::min(Align, StackAlign);
+ FrameIdx = MFI->CreateStackObject(RC->getSize(), Align, true);
+ if ((unsigned)FrameIdx < MinCSFrameIndex) MinCSFrameIndex = FrameIdx;
+ if ((unsigned)FrameIdx > MaxCSFrameIndex) MaxCSFrameIndex = FrameIdx;
+ } else {
+ // Spill it to the stack where we must.
+ FrameIdx =
+ MFI->CreateFixedSpillStackObject(RC->getSize(), FixedSlot->Offset);
+ }
- int FrameIdx;
- if (RegInfo->hasReservedSpillSlot(F, Reg, FrameIdx)) {
I->setFrameIdx(FrameIdx);
- continue;
}
+ }
- // Check to see if this physreg must be spilled to a particular stack slot
- // on this target.
- const TargetFrameLowering::SpillSlot *FixedSlot = FixedSpillSlots;
- while (FixedSlot != FixedSpillSlots+NumFixedSpillSlots &&
- FixedSlot->Reg != Reg)
- ++FixedSlot;
-
- if (FixedSlot == FixedSpillSlots + NumFixedSpillSlots) {
- // Nope, just spill it anywhere convenient.
- unsigned Align = RC->getAlignment();
- unsigned StackAlign = TFI->getStackAlignment();
-
- // We may not be able to satisfy the desired alignment specification of
- // the TargetRegisterClass if the stack alignment is smaller. Use the
- // min.
- Align = std::min(Align, StackAlign);
- FrameIdx = MFI->CreateStackObject(RC->getSize(), Align, true);
- if ((unsigned)FrameIdx < MinCSFrameIndex) MinCSFrameIndex = FrameIdx;
- if ((unsigned)FrameIdx > MaxCSFrameIndex) MaxCSFrameIndex = FrameIdx;
- } else {
- // Spill it to the stack where we must.
- FrameIdx = MFI->CreateFixedObject(RC->getSize(), FixedSlot->Offset, true);
- }
+ MFI->setCalleeSavedInfo(CSI);
+}
- I->setFrameIdx(FrameIdx);
+/// Helper function to update the liveness information for the callee-saved
+/// registers.
+static void updateLiveness(MachineFunction &MF) {
+ MachineFrameInfo *MFI = MF.getFrameInfo();
+ // Visited will contain all the basic blocks that are in the region
+ // where the callee saved registers are alive:
+ // - Anything that is not Save or Restore -> LiveThrough.
+ // - Save -> LiveIn.
+ // - Restore -> LiveOut.
+ // The live-out is not attached to the block, so no need to keep
+ // Restore in this set.
+ SmallPtrSet<MachineBasicBlock *, 8> Visited;
+ SmallVector<MachineBasicBlock *, 8> WorkList;
+ MachineBasicBlock *Entry = &MF.front();
+ MachineBasicBlock *Save = MFI->getSavePoint();
+
+ if (!Save)
+ Save = Entry;
+
+ if (Entry != Save) {
+ WorkList.push_back(Entry);
+ Visited.insert(Entry);
+ }
+ Visited.insert(Save);
+
+ MachineBasicBlock *Restore = MFI->getRestorePoint();
+ if (Restore)
+ // By construction Restore cannot be visited, otherwise it
+ // means there exists a path to Restore that does not go
+ // through Save.
+ WorkList.push_back(Restore);
+
+ while (!WorkList.empty()) {
+ const MachineBasicBlock *CurBB = WorkList.pop_back_val();
+ // By construction, the region that is after the save point is
+ // dominated by the Save and post-dominated by the Restore.
+ if (CurBB == Save)
+ continue;
+ // Enqueue all the successors not already visited.
+ // Those are by construction either before Save or after Restore.
+ for (MachineBasicBlock *SuccBB : CurBB->successors())
+ if (Visited.insert(SuccBB).second)
+ WorkList.push_back(SuccBB);
}
- MFI->setCalleeSavedInfo(CSI);
+ const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
+
+ for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
+ for (MachineBasicBlock *MBB : Visited)
+ // Add the callee-saved register as live-in.
+ // It's killed at the spill.
+ MBB->addLiveIn(CSI[i].getReg());
+ }
}
/// insertCSRSpillsAndRestores - Insert spill and restore code for
-/// callee saved registers used in the function, handling shrink wrapping.
+/// callee saved registers used in the function.
///
void PEI::insertCSRSpillsAndRestores(MachineFunction &Fn) {
// Get callee saved register information.
if (CSI.empty())
return;
- const TargetInstrInfo &TII = *Fn.getTarget().getInstrInfo();
- const TargetFrameLowering *TFI = Fn.getTarget().getFrameLowering();
- const TargetRegisterInfo *TRI = Fn.getTarget().getRegisterInfo();
+ const TargetInstrInfo &TII = *Fn.getSubtarget().getInstrInfo();
+ const TargetFrameLowering *TFI = Fn.getSubtarget().getFrameLowering();
+ const TargetRegisterInfo *TRI = Fn.getSubtarget().getRegisterInfo();
MachineBasicBlock::iterator I;
- if (!ShrinkWrapThisFunction) {
- // Spill using target interface.
- I = EntryBlock->begin();
- if (!TFI->spillCalleeSavedRegisters(*EntryBlock, I, CSI, TRI)) {
- for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
- // Add the callee-saved register as live-in.
- // It's killed at the spill.
- EntryBlock->addLiveIn(CSI[i].getReg());
-
- // Insert the spill to the stack frame.
- unsigned Reg = CSI[i].getReg();
- const TargetRegisterClass *RC = TRI->getMinimalPhysRegClass(Reg);
- TII.storeRegToStackSlot(*EntryBlock, I, Reg, true,
- CSI[i].getFrameIdx(), RC, TRI);
- }
- }
-
- // Restore using target interface.
- for (unsigned ri = 0, re = ReturnBlocks.size(); ri != re; ++ri) {
- MachineBasicBlock* MBB = ReturnBlocks[ri];
- I = MBB->end(); --I;
-
- // Skip over all terminator instructions, which are part of the return
- // sequence.
- MachineBasicBlock::iterator I2 = I;
- while (I2 != MBB->begin() && (--I2)->isTerminator())
- I = I2;
-
- bool AtStart = I == MBB->begin();
- MachineBasicBlock::iterator BeforeI = I;
- if (!AtStart)
- --BeforeI;
-
- // Restore all registers immediately before the return and any
- // terminators that precede it.
- if (!TFI->restoreCalleeSavedRegisters(*MBB, I, CSI, TRI)) {
- for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
- unsigned Reg = CSI[i].getReg();
- const TargetRegisterClass *RC = TRI->getMinimalPhysRegClass(Reg);
- TII.loadRegFromStackSlot(*MBB, I, Reg,
- CSI[i].getFrameIdx(),
- RC, TRI);
- assert(I != MBB->begin() &&
- "loadRegFromStackSlot didn't insert any code!");
- // Insert in reverse order. loadRegFromStackSlot can insert
- // multiple instructions.
- if (AtStart)
- I = MBB->begin();
- else {
- I = BeforeI;
- ++I;
- }
- }
- }
- }
- return;
- }
-
- // Insert spills.
- std::vector<CalleeSavedInfo> blockCSI;
- for (CSRegBlockMap::iterator BI = CSRSave.begin(),
- BE = CSRSave.end(); BI != BE; ++BI) {
- MachineBasicBlock* MBB = BI->first;
- CSRegSet save = BI->second;
-
- if (save.empty())
- continue;
-
- blockCSI.clear();
- for (CSRegSet::iterator RI = save.begin(),
- RE = save.end(); RI != RE; ++RI) {
- blockCSI.push_back(CSI[*RI]);
- }
- assert(blockCSI.size() > 0 &&
- "Could not collect callee saved register info");
-
- I = MBB->begin();
-
- // When shrink wrapping, use stack slot stores/loads.
- for (unsigned i = 0, e = blockCSI.size(); i != e; ++i) {
- // Add the callee-saved register as live-in.
- // It's killed at the spill.
- MBB->addLiveIn(blockCSI[i].getReg());
-
+ // Spill using target interface.
+ I = SaveBlock->begin();
+ if (!TFI->spillCalleeSavedRegisters(*SaveBlock, I, CSI, TRI)) {
+ for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
// Insert the spill to the stack frame.
- unsigned Reg = blockCSI[i].getReg();
+ unsigned Reg = CSI[i].getReg();
const TargetRegisterClass *RC = TRI->getMinimalPhysRegClass(Reg);
- TII.storeRegToStackSlot(*MBB, I, Reg,
- true,
- blockCSI[i].getFrameIdx(),
+ TII.storeRegToStackSlot(*SaveBlock, I, Reg, true, CSI[i].getFrameIdx(),
RC, TRI);
}
}
+ // Update the live-in information of all the blocks up to the save point.
+ updateLiveness(Fn);
- for (CSRegBlockMap::iterator BI = CSRRestore.begin(),
- BE = CSRRestore.end(); BI != BE; ++BI) {
- MachineBasicBlock* MBB = BI->first;
- CSRegSet restore = BI->second;
+ // Restore using target interface.
+ for (MachineBasicBlock *MBB : RestoreBlocks) {
+ I = MBB->end();
- if (restore.empty())
- continue;
-
- blockCSI.clear();
- for (CSRegSet::iterator RI = restore.begin(),
- RE = restore.end(); RI != RE; ++RI) {
- blockCSI.push_back(CSI[*RI]);
- }
- assert(blockCSI.size() > 0 &&
- "Could not find callee saved register info");
-
- // If MBB is empty and needs restores, insert at the _beginning_.
- if (MBB->empty()) {
- I = MBB->begin();
- } else {
- I = MBB->end();
- --I;
-
- // Skip over all terminator instructions, which are part of the
- // return sequence.
- if (! I->isTerminator()) {
- ++I;
- } else {
- MachineBasicBlock::iterator I2 = I;
- while (I2 != MBB->begin() && (--I2)->isTerminator())
- I = I2;
- }
- }
+ // Skip over all terminator instructions, which are part of the return
+ // sequence.
+ MachineBasicBlock::iterator I2 = I;
+ while (I2 != MBB->begin() && (--I2)->isTerminator())
+ I = I2;
bool AtStart = I == MBB->begin();
MachineBasicBlock::iterator BeforeI = I;
// Restore all registers immediately before the return and any
// terminators that precede it.
- for (unsigned i = 0, e = blockCSI.size(); i != e; ++i) {
- unsigned Reg = blockCSI[i].getReg();
- const TargetRegisterClass *RC = TRI->getMinimalPhysRegClass(Reg);
- TII.loadRegFromStackSlot(*MBB, I, Reg,
- blockCSI[i].getFrameIdx(),
- RC, TRI);
- assert(I != MBB->begin() &&
- "loadRegFromStackSlot didn't insert any code!");
- // Insert in reverse order. loadRegFromStackSlot can insert
- // multiple instructions.
- if (AtStart)
- I = MBB->begin();
- else {
- I = BeforeI;
- ++I;
+ if (!TFI->restoreCalleeSavedRegisters(*MBB, I, CSI, TRI)) {
+ for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
+ unsigned Reg = CSI[i].getReg();
+ const TargetRegisterClass *RC = TRI->getMinimalPhysRegClass(Reg);
+ TII.loadRegFromStackSlot(*MBB, I, Reg, CSI[i].getFrameIdx(), RC, TRI);
+ assert(I != MBB->begin() &&
+ "loadRegFromStackSlot didn't insert any code!");
+ // Insert in reverse order. loadRegFromStackSlot can insert
+ // multiple instructions.
+ if (AtStart)
+ I = MBB->begin();
+ else {
+ I = BeforeI;
+ ++I;
+ }
}
}
}
}
}
+/// AssignProtectedObjSet - Helper function to assign large stack objects (i.e.,
+/// those required to be close to the Stack Protector) to stack offsets.
+static void
+AssignProtectedObjSet(const StackObjSet &UnassignedObjs,
+ SmallSet<int, 16> &ProtectedObjs,
+ MachineFrameInfo *MFI, bool StackGrowsDown,
+ int64_t &Offset, unsigned &MaxAlign) {
+
+ for (StackObjSet::const_iterator I = UnassignedObjs.begin(),
+ E = UnassignedObjs.end(); I != E; ++I) {
+ int i = *I;
+ AdjustStackOffset(MFI, i, StackGrowsDown, Offset, MaxAlign);
+ ProtectedObjs.insert(i);
+ }
+}
+
/// calculateFrameObjectOffsets - Calculate actual frame offsets for all of the
/// abstract stack objects.
///
void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
- const TargetFrameLowering &TFI = *Fn.getTarget().getFrameLowering();
+ const TargetFrameLowering &TFI = *Fn.getSubtarget().getFrameLowering();
+ StackProtector *SP = &getAnalysis<StackProtector>();
bool StackGrowsDown =
TFI.getStackGrowthDirection() == TargetFrameLowering::StackGrowsDown;
unsigned Align = MFI->getObjectAlignment(i);
// Adjust to alignment boundary
- Offset = (Offset+Align-1)/Align*Align;
+ Offset = RoundUpToAlignment(Offset, Align);
MFI->setObjectOffset(i, -Offset); // Set the computed offset
}
for (int i = MaxCSFI; i >= MinCSFI ; --i) {
unsigned Align = MFI->getObjectAlignment(i);
// Adjust to alignment boundary
- Offset = (Offset+Align-1)/Align*Align;
+ Offset = RoundUpToAlignment(Offset, Align);
MFI->setObjectOffset(i, Offset);
Offset += MFI->getObjectSize(i);
// Make sure the special register scavenging spill slot is closest to the
// incoming stack pointer if a frame pointer is required and is closer
// to the incoming rather than the final stack pointer.
- const TargetRegisterInfo *RegInfo = Fn.getTarget().getRegisterInfo();
+ const TargetRegisterInfo *RegInfo = Fn.getSubtarget().getRegisterInfo();
bool EarlyScavengingSlots = (TFI.hasFP(Fn) &&
TFI.isFPCloseToIncomingSP() &&
RegInfo->useFPForScavengingIndex(Fn) &&
unsigned Align = MFI->getLocalFrameMaxAlign();
// Adjust to alignment boundary.
- Offset = (Offset + Align - 1) / Align * Align;
+ Offset = RoundUpToAlignment(Offset, Align);
DEBUG(dbgs() << "Local frame base offset: " << Offset << "\n");
// Make sure that the stack protector comes before the local variables on the
// stack.
- SmallSet<int, 16> LargeStackObjs;
+ SmallSet<int, 16> ProtectedObjs;
if (MFI->getStackProtectorIndex() >= 0) {
+ StackObjSet LargeArrayObjs;
+ StackObjSet SmallArrayObjs;
+ StackObjSet AddrOfObjs;
+
AdjustStackOffset(MFI, MFI->getStackProtectorIndex(), StackGrowsDown,
Offset, MaxAlign);
continue;
if (MFI->getStackProtectorIndex() == (int)i)
continue;
- if (!MFI->MayNeedStackProtector(i))
- continue;
- AdjustStackOffset(MFI, i, StackGrowsDown, Offset, MaxAlign);
- LargeStackObjs.insert(i);
+ switch (SP->getSSPLayout(MFI->getObjectAllocation(i))) {
+ case StackProtector::SSPLK_None:
+ continue;
+ case StackProtector::SSPLK_SmallArray:
+ SmallArrayObjs.insert(i);
+ continue;
+ case StackProtector::SSPLK_AddrOf:
+ AddrOfObjs.insert(i);
+ continue;
+ case StackProtector::SSPLK_LargeArray:
+ LargeArrayObjs.insert(i);
+ continue;
+ }
+ llvm_unreachable("Unexpected SSPLayoutKind.");
}
+
+ AssignProtectedObjSet(LargeArrayObjs, ProtectedObjs, MFI, StackGrowsDown,
+ Offset, MaxAlign);
+ AssignProtectedObjSet(SmallArrayObjs, ProtectedObjs, MFI, StackGrowsDown,
+ Offset, MaxAlign);
+ AssignProtectedObjSet(AddrOfObjs, ProtectedObjs, MFI, StackGrowsDown,
+ Offset, MaxAlign);
}
// Then assign frame offsets to stack objects that are not used to spill
continue;
if (MFI->getStackProtectorIndex() == (int)i)
continue;
- if (LargeStackObjs.count(i))
+ if (ProtectedObjs.count(i))
continue;
AdjustStackOffset(MFI, i, StackGrowsDown, Offset, MaxAlign);
// If the frame pointer is eliminated, all frame offsets will be relative to
// SP not FP. Align to MaxAlign so this works.
StackAlign = std::max(StackAlign, MaxAlign);
- unsigned AlignMask = StackAlign - 1;
- Offset = (Offset + AlignMask) & ~uint64_t(AlignMask);
+ Offset = RoundUpToAlignment(Offset, StackAlign);
}
// Update frame info to pretend that this is part of the stack...
/// prolog and epilog code to the function.
///
void PEI::insertPrologEpilogCode(MachineFunction &Fn) {
- const TargetFrameLowering &TFI = *Fn.getTarget().getFrameLowering();
+ const TargetFrameLowering &TFI = *Fn.getSubtarget().getFrameLowering();
// Add prologue to the function...
- TFI.emitPrologue(Fn);
+ TFI.emitPrologue(Fn, *SaveBlock);
- // Add epilogue to restore the callee-save registers in each exiting block
- for (MachineFunction::iterator I = Fn.begin(), E = Fn.end(); I != E; ++I) {
- // If last instruction is a return instruction, add an epilogue
- if (!I->empty() && I->back().isReturn())
- TFI.emitEpilogue(Fn, *I);
- }
+ // Add epilogue to restore the callee-save registers in each exiting block.
+ for (MachineBasicBlock *RestoreBlock : RestoreBlocks)
+ TFI.emitEpilogue(Fn, *RestoreBlock);
// Emit additional code that is required to support segmented stacks, if
// we've been asked for it. This, when linked with a runtime with support
// for segmented stacks (libgcc is one), will result in allocating stack
// space in small chunks instead of one large contiguous block.
- if (Fn.getTarget().Options.EnableSegmentedStacks)
- TFI.adjustForSegmentedStacks(Fn);
+ if (Fn.shouldSplitStack())
+ TFI.adjustForSegmentedStacks(Fn, *SaveBlock);
// Emit additional code that is required to explicitly handle the stack in
// HiPE native code (if needed) when loaded in the Erlang/OTP runtime. The
// different conditional check and another BIF for allocating more stack
// space.
if (Fn.getFunction()->getCallingConv() == CallingConv::HiPE)
- TFI.adjustForHiPEPrologue(Fn);
+ TFI.adjustForHiPEPrologue(Fn, *SaveBlock);
}
/// replaceFrameIndices - Replace all MO_FrameIndex operands with physical
/// register references and actual offsets.
///
void PEI::replaceFrameIndices(MachineFunction &Fn) {
- if (!Fn.getFrameInfo()->hasStackObjects()) return; // Nothing to do?
+ const TargetFrameLowering &TFI = *Fn.getSubtarget().getFrameLowering();
+ if (!TFI.needsFrameIndexResolution(Fn)) return;
+
+ MachineModuleInfo &MMI = Fn.getMMI();
+ const Function *F = Fn.getFunction();
+ const Function *ParentF = MMI.getWinEHParent(F);
+ unsigned FrameReg;
+ if (F == ParentF) {
+ WinEHFuncInfo &FuncInfo = MMI.getWinEHFuncInfo(Fn.getFunction());
+ // FIXME: This should be unconditional but we have bugs in the preparation
+ // pass.
+ if (FuncInfo.UnwindHelpFrameIdx != INT_MAX)
+ FuncInfo.UnwindHelpFrameOffset = TFI.getFrameIndexReferenceFromSP(
+ Fn, FuncInfo.UnwindHelpFrameIdx, FrameReg);
+ } else if (MMI.hasWinEHFuncInfo(F)) {
+ WinEHFuncInfo &FuncInfo = MMI.getWinEHFuncInfo(Fn.getFunction());
+ auto I = FuncInfo.CatchHandlerParentFrameObjIdx.find(F);
+ if (I != FuncInfo.CatchHandlerParentFrameObjIdx.end())
+ FuncInfo.CatchHandlerParentFrameObjOffset[F] =
+ TFI.getFrameIndexReferenceFromSP(Fn, I->second, FrameReg);
+ }
// Store SPAdj at exit of a basic block.
SmallVector<int, 8> SPState;
SmallPtrSet<MachineBasicBlock*, 8> Reachable;
// Iterate over the reachable blocks in DFS order.
- for (df_ext_iterator<MachineFunction*, SmallPtrSet<MachineBasicBlock*, 8> >
- DFI = df_ext_begin(&Fn, Reachable), DFE = df_ext_end(&Fn, Reachable);
+ for (auto DFI = df_ext_begin(&Fn, Reachable), DFE = df_ext_end(&Fn, Reachable);
DFI != DFE; ++DFI) {
int SPAdj = 0;
// Check the exit state of the DFS stack predecessor.
void PEI::replaceFrameIndices(MachineBasicBlock *BB, MachineFunction &Fn,
int &SPAdj) {
- const TargetMachine &TM = Fn.getTarget();
- assert(TM.getRegisterInfo() && "TM::getRegisterInfo() must be implemented!");
- const TargetInstrInfo &TII = *Fn.getTarget().getInstrInfo();
- const TargetRegisterInfo &TRI = *TM.getRegisterInfo();
- const TargetFrameLowering *TFI = TM.getFrameLowering();
- bool StackGrowsDown =
- TFI->getStackGrowthDirection() == TargetFrameLowering::StackGrowsDown;
+ assert(Fn.getSubtarget().getRegisterInfo() &&
+ "getRegisterInfo() must be implemented!");
+ const TargetInstrInfo &TII = *Fn.getSubtarget().getInstrInfo();
+ const TargetRegisterInfo &TRI = *Fn.getSubtarget().getRegisterInfo();
+ const TargetFrameLowering *TFI = Fn.getSubtarget().getFrameLowering();
int FrameSetupOpcode = TII.getCallFrameSetupOpcode();
int FrameDestroyOpcode = TII.getCallFrameDestroyOpcode();
if (RS && !FrameIndexVirtualScavenging) RS->enterBasicBlock(BB);
+ bool InsideCallSequence = false;
+
for (MachineBasicBlock::iterator I = BB->begin(); I != BB->end(); ) {
if (I->getOpcode() == FrameSetupOpcode ||
I->getOpcode() == FrameDestroyOpcode) {
- // Remember how much SP has been adjusted to create the call
- // frame.
- int Size = I->getOperand(0).getImm();
-
- if ((!StackGrowsDown && I->getOpcode() == FrameSetupOpcode) ||
- (StackGrowsDown && I->getOpcode() == FrameDestroyOpcode))
- Size = -Size;
-
- SPAdj += Size;
+ InsideCallSequence = (I->getOpcode() == FrameSetupOpcode);
+ SPAdj += TII.getSPAdjust(I);
MachineBasicBlock::iterator PrevI = BB->end();
- if (I != BB->begin()) PrevI = prior(I);
+ if (I != BB->begin()) PrevI = std::prev(I);
TFI->eliminateCallFramePseudoInstr(Fn, *BB, I);
// Visit the instructions created by eliminateCallFramePseudoInstr().
if (PrevI == BB->end())
I = BB->begin(); // The replaced instr was the first in the block.
else
- I = llvm::next(PrevI);
+ I = std::next(PrevI);
continue;
}
continue;
}
+ // TODO: This code should be commoned with the code for
+ // PATCHPOINT. There's no good reason for the difference in
+ // implementation other than historical accident. The only
+ // remaining difference is the unconditional use of the stack
+ // pointer as the base register.
+ if (MI->getOpcode() == TargetOpcode::STATEPOINT) {
+ assert((!MI->isDebugValue() || i == 0) &&
+ "Frame indicies can only appear as the first operand of a "
+ "DBG_VALUE machine instruction");
+ unsigned Reg;
+ MachineOperand &Offset = MI->getOperand(i + 1);
+ const unsigned refOffset =
+ TFI->getFrameIndexReferenceFromSP(Fn, MI->getOperand(i).getIndex(),
+ Reg);
+
+ Offset.setImm(Offset.getImm() + refOffset);
+ MI->getOperand(i).ChangeToRegister(Reg, false /*isDef*/);
+ continue;
+ }
+
// Some instructions (e.g. inline asm instructions) can have
// multiple frame indices and/or cause eliminateFrameIndex
// to insert more than one instruction. We need the register
// use that target machine register info object to eliminate
// it.
TRI.eliminateFrameIndex(MI, SPAdj, i,
- FrameIndexVirtualScavenging ? NULL : RS);
+ FrameIndexVirtualScavenging ? nullptr : RS);
// Reset the iterator if we were at the beginning of the BB.
if (AtBeginning) {
DoIncr = false;
}
- MI = 0;
+ MI = nullptr;
break;
}
+ // If we are looking at a call sequence, we need to keep track of
+ // the SP adjustment made by each instruction in the sequence.
+ // This includes both the frame setup/destroy pseudos (handled above),
+ // as well as other instructions that have side effects w.r.t the SP.
+ // Note that this must come after eliminateFrameIndex, because
+ // if I itself referred to a frame index, we shouldn't count its own
+ // adjustment.
+ if (MI && InsideCallSequence)
+ SPAdj += TII.getSPAdjust(MI);
+
if (DoIncr && I != BB->end()) ++I;
// Update register states.
/// FIXME: Iterating over the instruction stream is unnecessary. We can simply
/// iterate over the vreg use list, which at this point only contains machine
/// operands for which eliminateFrameIndex need a new scratch reg.
-void PEI::scavengeFrameVirtualRegs(MachineFunction &Fn) {
+void
+PEI::scavengeFrameVirtualRegs(MachineFunction &Fn) {
// Run through the instructions and find any virtual registers.
for (MachineFunction::iterator BB = Fn.begin(),
E = Fn.end(); BB != E; ++BB) {
// We might end up here again with a NULL iterator if we scavenged a
// register for which we inserted spill code for definition by what was
// originally the first instruction in BB.
- if (I == MachineBasicBlock::iterator(NULL))
+ if (I == MachineBasicBlock::iterator(nullptr))
I = BB->begin();
MachineInstr *MI = I;
- MachineBasicBlock::iterator J = llvm::next(I);
- MachineBasicBlock::iterator P = I == BB->begin() ?
- MachineBasicBlock::iterator(NULL) : llvm::prior(I);
+ MachineBasicBlock::iterator J = std::next(I);
+ MachineBasicBlock::iterator P =
+ I == BB->begin() ? MachineBasicBlock::iterator(nullptr)
+ : std::prev(I);
// RS should process this instruction before we might scavenge at this
// location. This is because we might be replacing a virtual register
// Replace this reference to the virtual register with the
// scratch register.
assert (ScratchReg && "Missing scratch register!");
+ MachineRegisterInfo &MRI = Fn.getRegInfo();
Fn.getRegInfo().replaceRegWith(Reg, ScratchReg);
+
+ // Make sure MRI now accounts this register as used.
+ MRI.setPhysRegUsed(ScratchReg);
// Because this instruction was processed by the RS before this
// register was allocated, make sure that the RS now records the
// register as being used.
- RS->setUsed(ScratchReg);
+ RS->setRegUsed(ScratchReg);
}
}
// spill code will have been inserted in between I and J. This is a
// problem because we need the spill code before I: Move I to just
// prior to J.
- if (I != llvm::prior(J)) {
+ if (I != std::prev(J)) {
BB->splice(J, BB, I);
// Before we move I, we need to prepare the RS to visit I again.
projects / oota-llvm.git / blobdiff