#define DEBUG_TYPE "pei"
#include "PrologEpilogInserter.h"
-#include "llvm/InlineAsm.h"
+#include "llvm/ADT/IndexedMap.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallSet.h"
+#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/MachineDominators.h"
-#include "llvm/CodeGen/MachineLoopInfo.h"
-#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/MachineLoopInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/RegisterScavenging.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetOptions.h"
-#include "llvm/Target/TargetRegisterInfo.h"
-#include "llvm/Target/TargetFrameLowering.h"
-#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/InlineAsm.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
-#include "llvm/ADT/IndexedMap.h"
-#include "llvm/ADT/SmallSet.h"
-#include "llvm/ADT/Statistic.h"
-#include "llvm/ADT/STLExtras.h"
+#include "llvm/Target/TargetFrameLowering.h"
+#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetOptions.h"
+#include "llvm/Target/TargetRegisterInfo.h"
#include <climits>
using namespace llvm;
char PEI::ID = 0;
+char &llvm::PrologEpilogCodeInserterID = PEI::ID;
INITIALIZE_PASS_BEGIN(PEI, "prologepilog",
"Prologue/Epilogue Insertion", false, false)
INITIALIZE_PASS_DEPENDENCY(MachineLoopInfo)
INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree)
+INITIALIZE_PASS_DEPENDENCY(TargetPassConfig)
INITIALIZE_PASS_END(PEI, "prologepilog",
- "Prologue/Epilogue Insertion", false, false)
+ "Prologue/Epilogue Insertion & Frame Finalization",
+ false, false)
STATISTIC(NumVirtualFrameRegs, "Number of virtual frame regs encountered");
STATISTIC(NumScavengedRegs, "Number of frame index regs scavenged");
-STATISTIC(NumBytesStackSpace, "Number of bytes used for stack in all functions");
-
-/// createPrologEpilogCodeInserter - This function returns a pass that inserts
-/// prolog and epilog code, and eliminates abstract frame references.
-///
-FunctionPass *llvm::createPrologEpilogCodeInserter() { return new PEI(); }
+STATISTIC(NumBytesStackSpace,
+ "Number of bytes used for stack in all functions");
/// runOnMachineFunction - Insert prolog/epilog code and replace abstract
/// frame indexes with appropriate references.
const TargetRegisterInfo *TRI = Fn.getTarget().getRegisterInfo();
const TargetFrameLowering *TFI = Fn.getTarget().getFrameLowering();
+ assert(!Fn.getRegInfo().getNumVirtRegs() && "Regalloc must assign all vregs");
+
RS = TRI->requiresRegisterScavenging(Fn) ? new RegScavenger() : NULL;
FrameIndexVirtualScavenging = TRI->requiresFrameIndexScavenging(Fn);
placeCSRSpillsAndRestores(Fn);
// Add the code to save and restore the callee saved registers
- if (!F->hasFnAttr(Attribute::Naked))
+ if (!F->getAttributes().hasAttribute(AttributeSet::FunctionIndex,
+ Attribute::Naked))
insertCSRSpillsAndRestores(Fn);
// Allow the target machine to make final modifications to the function
// called functions. Because of this, calculateCalleeSavedRegisters()
// must be called before this function in order to set the AdjustsStack
// and MaxCallFrameSize variables.
- if (!F->hasFnAttr(Attribute::Naked))
+ if (!F->getAttributes().hasAttribute(AttributeSet::FunctionIndex,
+ Attribute::Naked))
insertPrologEpilogCode(Fn);
// Replace all MO_FrameIndex operands with physical register references
if (TRI->requiresRegisterScavenging(Fn) && FrameIndexVirtualScavenging)
scavengeFrameVirtualRegs(Fn);
+ // Clear any vregs created by virtual scavenging.
+ Fn.getRegInfo().clearVirtRegs();
+
delete RS;
clearAllSets();
return true;
}
-#if 0
-void PEI::getAnalysisUsage(AnalysisUsage &AU) const {
- AU.setPreservesCFG();
- if (ShrinkWrapping || ShrinkWrapFunc != "") {
- AU.addRequired<MachineLoopInfo>();
- AU.addRequired<MachineDominatorTree>();
- }
- AU.addPreserved<MachineLoopInfo>();
- AU.addPreserved<MachineDominatorTree>();
- MachineFunctionPass::getAnalysisUsage(AU);
-}
-#endif
-
/// calculateCallsInformation - Calculate the MaxCallFrameSize and AdjustsStack
/// variables for the function's frame information and eliminate call frame
/// pseudo instructions.
/// calculateCalleeSavedRegisters - Scan the function for modified callee saved
/// registers.
-void PEI::calculateCalleeSavedRegisters(MachineFunction &Fn) {
- const TargetRegisterInfo *RegInfo = Fn.getTarget().getRegisterInfo();
- const TargetFrameLowering *TFI = Fn.getTarget().getFrameLowering();
- MachineFrameInfo *MFI = Fn.getFrameInfo();
+void PEI::calculateCalleeSavedRegisters(MachineFunction &F) {
+ const TargetRegisterInfo *RegInfo = F.getTarget().getRegisterInfo();
+ const TargetFrameLowering *TFI = F.getTarget().getFrameLowering();
+ MachineFrameInfo *MFI = F.getFrameInfo();
// Get the callee saved register list...
- const unsigned *CSRegs = RegInfo->getCalleeSavedRegs(&Fn);
+ const uint16_t *CSRegs = RegInfo->getCalleeSavedRegs(&F);
// These are used to keep track the callee-save area. Initialize them.
MinCSFrameIndex = INT_MAX;
return;
// In Naked functions we aren't going to save any registers.
- if (Fn.getFunction()->hasFnAttr(Attribute::Naked))
+ if (F.getFunction()->getAttributes().hasAttribute(AttributeSet::FunctionIndex,
+ Attribute::Naked))
return;
std::vector<CalleeSavedInfo> CSI;
for (unsigned i = 0; CSRegs[i]; ++i) {
unsigned Reg = CSRegs[i];
- if (Fn.getRegInfo().isPhysRegUsed(Reg)) {
+ if (F.getRegInfo().isPhysRegUsed(Reg)) {
// If the reg is modified, save it!
CSI.push_back(CalleeSavedInfo(Reg));
- } else {
- for (const unsigned *AliasSet = RegInfo->getAliasSet(Reg);
- *AliasSet; ++AliasSet) { // Check alias registers too.
- if (Fn.getRegInfo().isPhysRegUsed(*AliasSet)) {
- CSI.push_back(CalleeSavedInfo(Reg));
- break;
- }
- }
}
}
const TargetRegisterClass *RC = RegInfo->getMinimalPhysRegClass(Reg);
int FrameIdx;
- if (RegInfo->hasReservedSpillSlot(Fn, Reg, FrameIdx)) {
+ if (RegInfo->hasReservedSpillSlot(F, Reg, FrameIdx)) {
I->setFrameIdx(FrameIdx);
continue;
}
const TargetRegisterInfo *TRI = Fn.getTarget().getRegisterInfo();
MachineBasicBlock::iterator I;
- if (! ShrinkWrapThisFunction) {
+ if (!ShrinkWrapThisFunction) {
// Spill using target interface.
I = EntryBlock->begin();
if (!TFI->spillCalleeSavedRegisters(*EntryBlock, I, CSI, TRI)) {
// Skip over all terminator instructions, which are part of the return
// sequence.
MachineBasicBlock::iterator I2 = I;
- while (I2 != MBB->begin() && (--I2)->getDesc().isTerminator())
+ while (I2 != MBB->begin() && (--I2)->isTerminator())
I = I2;
bool AtStart = I == MBB->begin();
// Skip over all terminator instructions, which are part of the
// return sequence.
- if (! I->getDesc().isTerminator()) {
+ if (! I->isTerminator()) {
++I;
} else {
MachineBasicBlock::iterator I2 = I;
- while (I2 != MBB->begin() && (--I2)->getDesc().isTerminator())
+ while (I2 != MBB->begin() && (--I2)->isTerminator())
I = I2;
}
}
// 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().getDesc().isReturn())
+ if (!I->empty() && I->back().isReturn())
TFI.emitEpilogue(Fn, *I);
}
- // Emit additional code that is required 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 allocating stack space in
- // small chunks instead of one large contiguous block.
- if (EnableSegmentedStacks)
+ // 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);
}
/// scavengeFrameVirtualRegs - Replace all frame index virtual registers
/// with physical registers. Use the register scavenger to find an
/// appropriate register to use.
+///
+/// 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) {
// Run through the instructions and find any virtual registers.
for (MachineFunction::iterator BB = Fn.begin(),
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