X86FrameLowering.cpp File Reference

#include "X86FrameLowering.h"
#include "X86InstrBuilder.h"
#include "X86InstrInfo.h"
#include "X86MachineFunctionInfo.h"
#include "X86Subtarget.h"
#include "X86TargetMachine.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Function.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Target/TargetOptions.h"

Include dependency graph for X86FrameLowering.cpp:

Go to the source code of this file.

Functions
static unsigned	getSUBriOpcode (unsigned IsLP64, int64_t Imm)
static unsigned	getADDriOpcode (unsigned IsLP64, int64_t Imm)
static unsigned	getLEArOpcode (unsigned IsLP64)
static unsigned	findDeadCallerSavedReg (MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI, const TargetRegisterInfo &TRI, bool Is64Bit)
static void	emitSPUpdate (MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI, unsigned StackPtr, int64_t NumBytes, bool Is64Bit, bool IsLP64, bool UseLEA, const TargetInstrInfo &TII, const TargetRegisterInfo &TRI)
static void	mergeSPUpdatesUp (MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI, unsigned StackPtr, uint64_t *NumBytes=NULL)
	mergeSPUpdatesUp - Merge two stack-manipulating instructions upper iterator. More...
static void	mergeSPUpdatesDown (MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI, unsigned StackPtr, uint64_t *NumBytes=NULL)
	mergeSPUpdatesDown - Merge two stack-manipulating instructions lower iterator. More...
static int	mergeSPUpdates (MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI, unsigned StackPtr, bool doMergeWithPrevious)
static bool	isEAXLiveIn (MachineFunction &MF)
static bool	usesTheStack (const MachineFunction &MF)
static bool	HasNestArgument (const MachineFunction *MF)
static unsigned	GetScratchRegister (bool Is64Bit, const MachineFunction &MF, bool Primary)

Variables
cl::opt< bool >	ForceStackAlign
static const uint64_t	kSplitStackAvailable = 256

Function Documentation

static void emitSPUpdate ( MachineBasicBlock &  MBB, MachineBasicBlock::iterator &  MBBI, unsigned  StackPtr, int64_t  NumBytes, bool  Is64Bit, bool  IsLP64, bool  UseLEA, const TargetInstrInfo &  TII, const TargetRegisterInfo &  TRI  )

static

emitSPUpdate - Emit a series of instructions to increment / decrement the stack pointer by a constant value.

Definition at line 146 of file X86FrameLowering.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::addRegOffset(), llvm::BuildMI(), llvm::N86::EAX, findDeadCallerSavedReg(), llvm::MachineBasicBlock::findDebugLoc(), llvm::MachineInstr::FrameSetup, llvm::MCInstrInfo::get(), getADDriOpcode(), llvm::getDefRegState(), getLEArOpcode(), llvm::MachineInstr::getOperand(), getSUBriOpcode(), llvm::getUndefRegState(), llvm::A64CC::MI, llvm::MachineInstr::setFlag(), and llvm::MachineOperand::setIsDead().

static unsigned findDeadCallerSavedReg ( MachineBasicBlock &  MBB, MachineBasicBlock::iterator &  MBBI, const TargetRegisterInfo &  TRI, bool  Is64Bit  )

static

findDeadCallerSavedReg - Return a caller-saved register that isn't live when it reaches the "return" instruction. We can then pop a stack object to this register without worry about clobbering it.

Definition at line 89 of file X86FrameLowering.cpp.

References llvm::MachineModuleInfo::callsEHReturn(), llvm::SmallSet< T, N, C >::count(), llvm::N86::EAX, llvm::N86::ECX, llvm::N86::EDX, llvm::ISD::EH_RETURN, F(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getMMI(), llvm::MachineBasicBlock::getParent(), llvm::MachineOperand::getReg(), llvm::SmallSet< T, N, C >::insert(), llvm::MachineOperand::isDef(), llvm::MachineOperand::isReg(), and llvm::MCRegAliasIterator::isValid().

Referenced by emitSPUpdate().

static unsigned getADDriOpcode ( unsigned  IsLP64, int64_t  Imm  )

static

Definition at line 70 of file X86FrameLowering.cpp.

References llvm::isInt< 8 >().

Referenced by llvm::X86FrameLowering::eliminateCallFramePseudoInstr(), and emitSPUpdate().

static unsigned getLEArOpcode ( unsigned  IsLP64 )

static

Definition at line 82 of file X86FrameLowering.cpp.

Referenced by llvm::X86FrameLowering::emitEpilogue(), and emitSPUpdate().

static unsigned GetScratchRegister ( bool  Is64Bit, const MachineFunction &  MF, bool  Primary  )

static

GetScratchRegister - Get a temp register for performing work in the segmented stack and the Erlang/HiPE stack prologue. Depending on platform and the properties of the function either one or two registers will be needed. Set primary to true for the first register, false for the second.

Definition at line 1117 of file X86FrameLowering.cpp.

References llvm::N86::EAX, llvm::N86::EBX, llvm::N86::ECX, llvm::N86::EDI, llvm::N86::EDX, llvm::CallingConv::Fast, llvm::Function::getCallingConv(), llvm::MachineFunction::getFunction(), HasNestArgument(), llvm::CallingConv::HiPE, llvm::report_fatal_error(), and llvm::CallingConv::X86_FastCall.

Referenced by llvm::X86FrameLowering::adjustForHiPEPrologue(), and llvm::X86FrameLowering::adjustForSegmentedStacks().

static unsigned getSUBriOpcode ( unsigned  IsLP64, int64_t  Imm  )

static

Definition at line 58 of file X86FrameLowering.cpp.

References llvm::isInt< 8 >().

Referenced by llvm::X86FrameLowering::eliminateCallFramePseudoInstr(), llvm::X86FrameLowering::emitPrologue(), and emitSPUpdate().

static bool HasNestArgument ( const MachineFunction *  MF )

static

Definition at line 1102 of file X86FrameLowering.cpp.

References llvm::Function::arg_begin(), llvm::Function::arg_end(), F(), llvm::MachineFunction::getFunction(), and I.

Referenced by llvm::X86FrameLowering::adjustForSegmentedStacks(), and GetScratchRegister().

static bool isEAXLiveIn ( MachineFunction &  MF )

static

Definition at line 292 of file X86FrameLowering.cpp.

References llvm::A64CC::AL, llvm::N86::EAX, llvm::MachineFunction::getRegInfo(), llvm::MachineRegisterInfo::livein_begin(), and llvm::MachineRegisterInfo::livein_end().

Referenced by llvm::X86FrameLowering::emitPrologue().

static int mergeSPUpdates ( MachineBasicBlock &  MBB, MachineBasicBlock::iterator &  MBBI, unsigned  StackPtr, bool  doMergeWithPrevious  )

static

mergeSPUpdates - Checks the instruction before/after the passed instruction. If it is an ADD/SUB/LEA instruction it is deleted argument and the stack adjustment is returned as a positive value for ADD/LEA and a negative for SUB.

Definition at line 261 of file X86FrameLowering.cpp.

References llvm::MachineBasicBlock::begin(), llvm::MachineBasicBlock::end(), llvm::MachineBasicBlock::erase(), llvm::next(), and llvm::prior().

Referenced by llvm::X86FrameLowering::emitEpilogue(), and llvm::X86FrameLowering::emitPrologue().

static void mergeSPUpdatesDown ( MachineBasicBlock &  MBB, MachineBasicBlock::iterator &  MBBI, unsigned  StackPtr, uint64_t *  NumBytes = NULL  )

static

mergeSPUpdatesDown - Merge two stack-manipulating instructions lower iterator.

Definition at line 228 of file X86FrameLowering.cpp.

References llvm::MachineBasicBlock::end(), llvm::MachineBasicBlock::erase(), and llvm::next().

Referenced by llvm::X86FrameLowering::emitPrologue().

static void mergeSPUpdatesUp ( MachineBasicBlock &  MBB, MachineBasicBlock::iterator &  MBBI, unsigned  StackPtr, uint64_t *  NumBytes = NULL  )

static

mergeSPUpdatesUp - Merge two stack-manipulating instructions upper iterator.

Definition at line 204 of file X86FrameLowering.cpp.

References llvm::MachineBasicBlock::begin(), llvm::MachineBasicBlock::erase(), and llvm::prior().

Referenced by llvm::X86FrameLowering::emitEpilogue().

static bool usesTheStack ( const MachineFunction &  MF )

static

usesTheStack - This function checks if any of the users of EFLAGS copies the EFLAGS. We know that the code that lowers COPY of EFLAGS has to use the stack, and if we don't adjust the stack we clobber the first frame index. See X86InstrInfo::copyPhysReg.

Definition at line 373 of file X86FrameLowering.cpp.

References llvm::MachineFunction::getRegInfo(), MRI, llvm::MachineRegisterInfo::reg_begin(), and llvm::MachineRegisterInfo::reg_end().

Referenced by llvm::X86FrameLowering::emitPrologue().

Variable Documentation

cl::opt<bool> ForceStackAlign

Referenced by llvm::X86FrameLowering::emitEpilogue(), llvm::X86FrameLowering::emitPrologue(), and llvm::X86RegisterInfo::needsStackRealignment().

const uint64_t kSplitStackAvailable = 256

static

Definition at line 1147 of file X86FrameLowering.cpp.

Referenced by llvm::X86FrameLowering::adjustForSegmentedStacks().