llvm-6502/lib/Target/X86/X86FrameLowering.h
Rafael Espindola 76927d7586 Emit segmented-stack specific code into function prologues for
X86. Modify the pass added in the previous patch to call this new
code.

This new prologues generated will call a libgcc routine (__morestack)
to allocate more stack space from the heap when required

Patch by Sanjoy Das.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138812 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-30 19:39:58 +00:00

69 lines
2.4 KiB
C++

//=-- X86TargetFrameLowering.h - Define frame lowering for X86 ---*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This class implements X86-specific bits of TargetFrameLowering class.
//
//===----------------------------------------------------------------------===//
#ifndef X86_FRAMELOWERING_H
#define X86_FRAMELOWERING_H
#include "X86Subtarget.h"
#include "llvm/MC/MCDwarf.h"
#include "llvm/Target/TargetFrameLowering.h"
namespace llvm {
class MCSymbol;
class X86TargetMachine;
class X86FrameLowering : public TargetFrameLowering {
const X86TargetMachine &TM;
const X86Subtarget &STI;
public:
explicit X86FrameLowering(const X86TargetMachine &tm, const X86Subtarget &sti)
: TargetFrameLowering(StackGrowsDown,
sti.getStackAlignment(),
(sti.is64Bit() ? -8 : -4)),
TM(tm), STI(sti) {
}
void emitCalleeSavedFrameMoves(MachineFunction &MF, MCSymbol *Label,
unsigned FramePtr) const;
/// emitProlog/emitEpilog - These methods insert prolog and epilog code into
/// the function.
void emitPrologue(MachineFunction &MF) const;
void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
void adjustForSegmentedStacks(MachineFunction &MF) const;
void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
RegScavenger *RS = NULL) const;
bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
const std::vector<CalleeSavedInfo> &CSI,
const TargetRegisterInfo *TRI) const;
bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
const std::vector<CalleeSavedInfo> &CSI,
const TargetRegisterInfo *TRI) const;
bool hasFP(const MachineFunction &MF) const;
bool hasReservedCallFrame(const MachineFunction &MF) const;
int getFrameIndexOffset(const MachineFunction &MF, int FI) const;
uint32_t getCompactUnwindEncoding(MachineFunction &MF) const;
};
} // End llvm namespace
#endif