isSpillSlot(isSS), Alloca(Val), PreAllocated(false), isAliased(A) {}
};
- const TargetMachine &TM;
+ /// StackAlignment - The alignment of the stack.
+ unsigned StackAlignment;
+
+ /// StackRealignable - Can the stack be realigned.
+ bool StackRealignable;
/// Objects - The list of stack objects allocated...
///
/// True if the function contains a call to the llvm.vastart intrinsic.
bool HasVAStart;
- const TargetFrameLowering *getFrameLowering() const;
+ /// True if this is a varargs function that contains a musttail call.
+ bool HasMustTailInVarArgFunc;
+
+ /// True if this function contains a tail call. If so immutable objects like
+ /// function arguments are no longer so. A tail call *can* override fixed
+ /// stack objects like arguments so we can't treat them as immutable.
+ bool HasTailCall;
+
+ /// Not null, if shrink-wrapping found a better place for the prologue.
+ MachineBasicBlock *Save;
+ /// Not null, if shrink-wrapping found a better place for the epilogue.
+ MachineBasicBlock *Restore;
+
public:
- explicit MachineFrameInfo(const TargetMachine &TM, bool RealignOpt)
- : TM(TM), RealignOption(RealignOpt) {
+ explicit MachineFrameInfo(unsigned StackAlign, bool isStackRealign,
+ bool RealignOpt)
+ : StackAlignment(StackAlign), StackRealignable(isStackRealign),
+ RealignOption(RealignOpt) {
StackSize = NumFixedObjects = OffsetAdjustment = MaxAlignment = 0;
HasVarSizedObjects = false;
FrameAddressTaken = false;
UseLocalStackAllocationBlock = false;
HasInlineAsmWithSPAdjust = false;
HasVAStart = false;
+ HasMustTailInVarArgFunc = false;
+ Save = nullptr;
+ Restore = nullptr;
+ HasTailCall = false;
}
/// hasStackObjects - Return true if there are any stack objects in this
bool hasVAStart() const { return HasVAStart; }
void setHasVAStart(bool B) { HasVAStart = B; }
+ /// Returns true if the function is variadic and contains a musttail call.
+ bool hasMustTailInVarArgFunc() const { return HasMustTailInVarArgFunc; }
+ void setHasMustTailInVarArgFunc(bool B) { HasMustTailInVarArgFunc = B; }
+
+ /// Returns true if the function contains a tail call.
+ bool hasTailCall() const { return HasTailCall; }
+ void setHasTailCall() { HasTailCall = true; }
+
/// getMaxCallFrameSize - Return the maximum size of a call frame that must be
/// allocated for an outgoing function call. This is only available if
/// CallFrameSetup/Destroy pseudo instructions are used by the target, and
/// isImmutableObjectIndex - Returns true if the specified index corresponds
/// to an immutable object.
bool isImmutableObjectIndex(int ObjectIdx) const {
+ // Tail calling functions can clobber their function arguments.
+ if (HasTailCall)
+ return false;
assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
"Invalid Object Idx!");
return Objects[ObjectIdx+NumFixedObjects].isImmutable;
void setCalleeSavedInfoValid(bool v) { CSIValid = v; }
- /// getPristineRegs - Return a set of physical registers that are pristine on
- /// entry to the MBB.
+ MachineBasicBlock *getSavePoint() const { return Save; }
+ void setSavePoint(MachineBasicBlock *NewSave) { Save = NewSave; }
+ MachineBasicBlock *getRestorePoint() const { return Restore; }
+ void setRestorePoint(MachineBasicBlock *NewRestore) { Restore = NewRestore; }
+
+ /// Return a set of physical registers that are pristine.
///
/// Pristine registers hold a value that is useless to the current function,
- /// but that must be preserved - they are callee saved registers that have not
- /// been saved yet.
+ /// but that must be preserved - they are callee saved registers that are not
+ /// saved.
///
/// Before the PrologueEpilogueInserter has placed the CSR spill code, this
/// method always returns an empty set.
- BitVector getPristineRegs(const MachineBasicBlock *MBB) const;
+ BitVector getPristineRegs(const MachineFunction &MF) const;
/// print - Used by the MachineFunction printer to print information about
/// stack objects. Implemented in MachineFunction.cpp