FrameIndexVirtualScavenging = TRI->requiresFrameIndexScavenging(Fn);
FrameConstantRegMap.clear();
- // Calculate the MaxCallFrameSize and HasCalls variables for the function's
- // frame information. Also eliminates call frame pseudo instructions.
+ // Calculate the MaxCallFrameSize and AdjustsStack variables for the
+ // function's frame information. Also eliminates call frame pseudo
+ // instructions.
calculateCallsInformation(Fn);
// Allow the target machine to make some adjustments to the function
// Add prolog and epilog code to the function. This function is required
// to align the stack frame as necessary for any stack variables or
- // called functions. Because of this, calculateCalleeSavedRegisters
- // must be called before this function in order to set the HasCalls
+ // 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))
insertPrologEpilogCode(Fn);
}
#endif
-/// calculateCallsInformation - Calculate the MaxCallFrameSize and HasCalls
+/// calculateCallsInformation - Calculate the MaxCallFrameSize and AdjustsStack
/// variables for the function's frame information and eliminate call frame
/// pseudo instructions.
void PEI::calculateCallsInformation(MachineFunction &Fn) {
MachineFrameInfo *MFI = Fn.getFrameInfo();
unsigned MaxCallFrameSize = 0;
- bool HasCalls = MFI->hasCalls();
+ bool AdjustsStack = MFI->adjustsStack();
// Get the function call frame set-up and tear-down instruction opcode
int FrameSetupOpcode = RegInfo->getCallFrameSetupOpcode();
" instructions should have a single immediate argument!");
unsigned Size = I->getOperand(0).getImm();
if (Size > MaxCallFrameSize) MaxCallFrameSize = Size;
- HasCalls = true;
+ AdjustsStack = true;
FrameSDOps.push_back(I);
} else if (I->isInlineAsm()) {
// An InlineAsm might be a call; assume it is to get the stack frame
// aligned correctly for calls.
- HasCalls = true;
+ AdjustsStack = true;
}
- MFI->setHasCalls(HasCalls);
+ MFI->setAdjustsStack(AdjustsStack);
MFI->setMaxCallFrameSize(MaxCallFrameSize);
for (std::vector<MachineBasicBlock::iterator>::iterator
if (CSRegs == 0 || CSRegs[0] == 0)
return;
+ // In Naked functions we aren't going to save any registers.
+ if (Fn.getFunction()->hasFnAttr(Attribute::Naked))
+ return;
+
// Figure out which *callee saved* registers are modified by the current
// function, thus needing to be saved and restored in the prolog/epilog.
const TargetRegisterClass * const *CSRegClasses =
return;
const TargetInstrInfo &TII = *Fn.getTarget().getInstrInfo();
+ const TargetRegisterInfo *TRI = Fn.getTarget().getRegisterInfo();
MachineBasicBlock::iterator I;
if (! ShrinkWrapThisFunction) {
// Spill using target interface.
I = EntryBlock->begin();
- if (!TII.spillCalleeSavedRegisters(*EntryBlock, I, CSI)) {
+ if (!TII.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.
// Insert the spill to the stack frame.
TII.storeRegToStackSlot(*EntryBlock, I, CSI[i].getReg(), true,
- CSI[i].getFrameIdx(), CSI[i].getRegClass());
+ CSI[i].getFrameIdx(), CSI[i].getRegClass(),TRI);
}
}
// Restore all registers immediately before the return and any
// terminators that preceed it.
- if (!TII.restoreCalleeSavedRegisters(*MBB, I, CSI)) {
+ if (!TII.restoreCalleeSavedRegisters(*MBB, I, CSI, TRI)) {
for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
TII.loadRegFromStackSlot(*MBB, I, CSI[i].getReg(),
CSI[i].getFrameIdx(),
- CSI[i].getRegClass());
+ CSI[i].getRegClass(), TRI);
assert(I != MBB->begin() &&
"loadRegFromStackSlot didn't insert any code!");
// Insert in reverse order. loadRegFromStackSlot can insert
TII.storeRegToStackSlot(*MBB, I, blockCSI[i].getReg(),
true,
blockCSI[i].getFrameIdx(),
- blockCSI[i].getRegClass());
+ blockCSI[i].getRegClass(), TRI);
}
}
for (unsigned i = 0, e = blockCSI.size(); i != e; ++i) {
TII.loadRegFromStackSlot(*MBB, I, blockCSI[i].getReg(),
blockCSI[i].getFrameIdx(),
- blockCSI[i].getRegClass());
+ blockCSI[i].getRegClass(), TRI);
assert(I != MBB->begin() &&
"loadRegFromStackSlot didn't insert any code!");
// Insert in reverse order. loadRegFromStackSlot can insert
// callee saved registers.
if (StackGrowsDown) {
for (unsigned i = MinCSFrameIndex; i <= MaxCSFrameIndex; ++i) {
- // If stack grows down, we need to add size of find the lowest
+ // If the stack grows down, we need to add the size to find the lowest
// address of the object.
Offset += MFI->getObjectSize(i);
// If we have reserved argument space for call sites in the function
// immediately on entry to the current function, count it as part of the
// overall stack size.
- if (MFI->hasCalls() && RegInfo->hasReservedCallFrame(Fn))
+ if (MFI->adjustsStack() && RegInfo->hasReservedCallFrame(Fn))
Offset += MFI->getMaxCallFrameSize();
// Round up the size to a multiple of the alignment. If the function has
// otherwise, for leaf functions, align to the TransientStackAlignment
// value.
unsigned StackAlign;
- if (MFI->hasCalls() || MFI->hasVarSizedObjects() ||
+ if (MFI->adjustsStack() || MFI->hasVarSizedObjects() ||
(RegInfo->needsStackRealignment(Fn) && MFI->getObjectIndexEnd() != 0))
StackAlign = TFI.getStackAlignment();
else
StackAlign = TFI.getTransientStackAlignment();
- // If the frame pointer is eliminated, all frame offsets will be relative
- // to SP not FP; align to MaxAlign so this works.
+
+ // 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);
MFI->setStackSize(Offset - LocalAreaOffset);
}
-
/// insertPrologEpilogCode - Scan the function for modified callee saved
/// registers, insert spill code for these callee saved registers, then add
/// prolog and epilog code to the function.
}
}
-
/// replaceFrameIndices - Replace all MO_FrameIndex operands with physical
/// register references and actual offsets.
///
projects / oota-llvm.git / blobdiff