llvm-6502/lib/Target/X86/X86MachineFunctionInfo.h
Reid Kleckner 34b7fde802 Make musttail more robust for vector types on x86
Previously I tried to plug musttail into the existing vararg lowering
code. That turned out to be a mistake, because non-vararg calls use
significantly different register lowering, even on x86. For example, AVX
vectors are usually passed in registers to normal functions and memory
to vararg functions.  Now musttail uses a completely separate lowering.

Hopefully this can be used as the basis for non-x86 perfect forwarding.

Reviewers: majnemer

Differential Revision: http://reviews.llvm.org/D6156

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224745 91177308-0d34-0410-b5e6-96231b3b80d8
2014-12-22 23:58:37 +00:00

169 lines
6.6 KiB
C++

//===-- X86MachineFuctionInfo.h - X86 machine function info -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares X86-specific per-machine-function information.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_X86_X86MACHINEFUNCTIONINFO_H
#define LLVM_LIB_TARGET_X86_X86MACHINEFUNCTIONINFO_H
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineValueType.h"
#include <vector>
namespace llvm {
/// X86MachineFunctionInfo - This class is derived from MachineFunction and
/// contains private X86 target-specific information for each MachineFunction.
class X86MachineFunctionInfo : public MachineFunctionInfo {
virtual void anchor();
/// ForceFramePointer - True if the function is required to use of frame
/// pointer for reasons other than it containing dynamic allocation or
/// that FP eliminatation is turned off. For example, Cygwin main function
/// contains stack pointer re-alignment code which requires FP.
bool ForceFramePointer;
/// RestoreBasePointerOffset - Non-zero if the function has base pointer
/// and makes call to llvm.eh.sjlj.setjmp. When non-zero, the value is a
/// displacement from the frame pointer to a slot where the base pointer
/// is stashed.
signed char RestoreBasePointerOffset;
/// CalleeSavedFrameSize - Size of the callee-saved register portion of the
/// stack frame in bytes.
unsigned CalleeSavedFrameSize;
/// BytesToPopOnReturn - Number of bytes function pops on return (in addition
/// to the space used by the return address).
/// Used on windows platform for stdcall & fastcall name decoration
unsigned BytesToPopOnReturn;
/// ReturnAddrIndex - FrameIndex for return slot.
int ReturnAddrIndex;
/// TailCallReturnAddrDelta - The number of bytes by which return address
/// stack slot is moved as the result of tail call optimization.
int TailCallReturnAddrDelta;
/// SRetReturnReg - Some subtargets require that sret lowering includes
/// returning the value of the returned struct in a register. This field
/// holds the virtual register into which the sret argument is passed.
unsigned SRetReturnReg;
/// GlobalBaseReg - keeps track of the virtual register initialized for
/// use as the global base register. This is used for PIC in some PIC
/// relocation models.
unsigned GlobalBaseReg;
/// VarArgsFrameIndex - FrameIndex for start of varargs area.
int VarArgsFrameIndex;
/// RegSaveFrameIndex - X86-64 vararg func register save area.
int RegSaveFrameIndex;
/// VarArgsGPOffset - X86-64 vararg func int reg offset.
unsigned VarArgsGPOffset;
/// VarArgsFPOffset - X86-64 vararg func fp reg offset.
unsigned VarArgsFPOffset;
/// ArgumentStackSize - The number of bytes on stack consumed by the arguments
/// being passed on the stack.
unsigned ArgumentStackSize;
/// NumLocalDynamics - Number of local-dynamic TLS accesses.
unsigned NumLocalDynamics;
private:
/// ForwardedMustTailRegParms - A list of virtual and physical registers
/// that must be forwarded to every musttail call.
SmallVector<ForwardedRegister, 1> ForwardedMustTailRegParms;
public:
X86MachineFunctionInfo() : ForceFramePointer(false),
RestoreBasePointerOffset(0),
CalleeSavedFrameSize(0),
BytesToPopOnReturn(0),
ReturnAddrIndex(0),
TailCallReturnAddrDelta(0),
SRetReturnReg(0),
GlobalBaseReg(0),
VarArgsFrameIndex(0),
RegSaveFrameIndex(0),
VarArgsGPOffset(0),
VarArgsFPOffset(0),
ArgumentStackSize(0),
NumLocalDynamics(0) {}
explicit X86MachineFunctionInfo(MachineFunction &MF)
: ForceFramePointer(false),
RestoreBasePointerOffset(0),
CalleeSavedFrameSize(0),
BytesToPopOnReturn(0),
ReturnAddrIndex(0),
TailCallReturnAddrDelta(0),
SRetReturnReg(0),
GlobalBaseReg(0),
VarArgsFrameIndex(0),
RegSaveFrameIndex(0),
VarArgsGPOffset(0),
VarArgsFPOffset(0),
ArgumentStackSize(0),
NumLocalDynamics(0) {}
bool getForceFramePointer() const { return ForceFramePointer;}
void setForceFramePointer(bool forceFP) { ForceFramePointer = forceFP; }
bool getRestoreBasePointer() const { return RestoreBasePointerOffset!=0; }
void setRestoreBasePointer(const MachineFunction *MF);
int getRestoreBasePointerOffset() const {return RestoreBasePointerOffset; }
unsigned getCalleeSavedFrameSize() const { return CalleeSavedFrameSize; }
void setCalleeSavedFrameSize(unsigned bytes) { CalleeSavedFrameSize = bytes; }
unsigned getBytesToPopOnReturn() const { return BytesToPopOnReturn; }
void setBytesToPopOnReturn (unsigned bytes) { BytesToPopOnReturn = bytes;}
int getRAIndex() const { return ReturnAddrIndex; }
void setRAIndex(int Index) { ReturnAddrIndex = Index; }
int getTCReturnAddrDelta() const { return TailCallReturnAddrDelta; }
void setTCReturnAddrDelta(int delta) {TailCallReturnAddrDelta = delta;}
unsigned getSRetReturnReg() const { return SRetReturnReg; }
void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
unsigned getGlobalBaseReg() const { return GlobalBaseReg; }
void setGlobalBaseReg(unsigned Reg) { GlobalBaseReg = Reg; }
int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
void setVarArgsFrameIndex(int Idx) { VarArgsFrameIndex = Idx; }
int getRegSaveFrameIndex() const { return RegSaveFrameIndex; }
void setRegSaveFrameIndex(int Idx) { RegSaveFrameIndex = Idx; }
unsigned getVarArgsGPOffset() const { return VarArgsGPOffset; }
void setVarArgsGPOffset(unsigned Offset) { VarArgsGPOffset = Offset; }
unsigned getVarArgsFPOffset() const { return VarArgsFPOffset; }
void setVarArgsFPOffset(unsigned Offset) { VarArgsFPOffset = Offset; }
unsigned getArgumentStackSize() const { return ArgumentStackSize; }
void setArgumentStackSize(unsigned size) { ArgumentStackSize = size; }
unsigned getNumLocalDynamicTLSAccesses() const { return NumLocalDynamics; }
void incNumLocalDynamicTLSAccesses() { ++NumLocalDynamics; }
SmallVectorImpl<ForwardedRegister> &getForwardedMustTailRegParms() {
return ForwardedMustTailRegParms;
}
};
} // End llvm namespace
#endif