X86MCCodeEmitter.cpp File Reference

#include "MCTargetDesc/X86MCTargetDesc.h"
#include "MCTargetDesc/X86BaseInfo.h"
#include "MCTargetDesc/X86FixupKinds.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/raw_ostream.h"

Include dependency graph for X86MCCodeEmitter.cpp:

Go to the source code of this file.

Defines
#define	DEBUG_TYPE   "mccodeemitter"
Enumerations
enum	GlobalOffsetTableExprKind { GOT_None, GOT_Normal, GOT_SymDiff }
Functions
static bool	isDisp8 (int Value)
static bool	isCDisp8 (uint64_t TSFlags, int Value, int &CValue)
static MCFixupKind	getImmFixupKind (uint64_t TSFlags)
static bool	Is32BitMemOperand (const MCInst &MI, unsigned Op)
static bool	Is64BitMemOperand (const MCInst &MI, unsigned Op)
static GlobalOffsetTableExprKind	StartsWithGlobalOffsetTable (const MCExpr *Expr)
static bool	HasSecRelSymbolRef (const MCExpr *Expr)
static unsigned	DetermineREXPrefix (const MCInst &MI, uint64_t TSFlags, const MCInstrDesc &Desc)

---

Define Documentation

#define DEBUG_TYPE   "mccodeemitter"

Definition at line 29 of file X86MCCodeEmitter.cpp.

---

Enumeration Type Documentation

enum GlobalOffsetTableExprKind

StartsWithGlobalOffsetTable - Check if this expression starts with _GLOBAL_OFFSET_TABLE_ and if it is of the form _GLOBAL_OFFSET_TABLE_-symbol. This is needed to support PIC on ELF i386 as _GLOBAL_OFFSET_TABLE_ is magical. We check only simple case that are know to be used: _GLOBAL_OFFSET_TABLE_ by itself or at the start of a binary expression.

Enumerator:

GOT_None
GOT_Normal
GOT_SymDiff

Definition at line 262 of file X86MCCodeEmitter.cpp.

---

Function Documentation

static unsigned DetermineREXPrefix	(	const MCInst &	MI,
		uint64_t	TSFlags,
		const MCInstrDesc &	Desc
	)		[static]

DetermineREXPrefix - Determine if the MCInst has to be encoded with a X86-64 REX prefix which specifies 1) 64-bit instructions, 2) non-default operand size, and 3) use of X86-64 extended registers.

Definition at line 992 of file X86MCCodeEmitter.cpp.

References llvm::X86::AddrNumOperands, llvm::tgtok::Bit, llvm::MCInst::getNumOperands(), llvm::MCInst::getOperand(), llvm::MCInstrDesc::getOperandConstraint(), llvm::MCOperand::getReg(), llvm::MCOperand::isReg(), llvm::X86II::isX86_64ExtendedReg(), llvm::X86II::isX86_64NonExtLowByteReg(), llvm::X86II::MRM0m, llvm::X86II::MRM1m, llvm::X86II::MRM2m, llvm::X86II::MRM3m, llvm::X86II::MRM4m, llvm::X86II::MRM5m, llvm::X86II::MRM6m, llvm::X86II::MRM7m, llvm::X86II::MRMDestMem, llvm::X86II::MRMSrcMem, llvm::X86II::MRMSrcReg, llvm::X86II::MRMXm, llvm::X86II::REX_W, and llvm::MCOI::TIED_TO.

static MCFixupKind getImmFixupKind

(

uint64_t

TSFlags

)

[static]

getImmFixupKind - Return the appropriate fixup kind to use for an immediate in an instruction with the specified TSFlags.

Definition at line 213 of file X86MCCodeEmitter.cpp.

References llvm::MCFixup::getKindForSize(), llvm::X86II::getSizeOfImm(), llvm::X86II::isImmPCRel(), llvm::X86II::isImmSigned(), llvm_unreachable, and llvm::X86::reloc_signed_4byte.

static bool HasSecRelSymbolRef

(

const MCExpr *

Expr

)

[static]

Definition at line 288 of file X86MCCodeEmitter.cpp.

References llvm::MCExpr::getKind(), llvm::MCSymbolRefExpr::getKind(), llvm::MCExpr::SymbolRef, and llvm::MCSymbolRefExpr::VK_SECREL.

static bool Is32BitMemOperand	(	const MCInst &	MI,
		unsigned	Op
	)		[static]

Is32BitMemOperand - Return true if the specified instruction has a 32-bit memory operand. Op specifies the operand # of the memoperand.

Definition at line 228 of file X86MCCodeEmitter.cpp.

References llvm::X86::AddrBaseReg, llvm::X86::AddrIndexReg, llvm::MCInst::getOperand(), and llvm::MCOperand::getReg().

static bool Is64BitMemOperand	(	const MCInst &	MI,
		unsigned	Op
	)		[static]

Is64BitMemOperand - Return true if the specified instruction has a 64-bit memory operand. Op specifies the operand # of the memoperand.

Definition at line 243 of file X86MCCodeEmitter.cpp.

References llvm::X86::AddrBaseReg, llvm::X86::AddrIndexReg, llvm::MCInst::getOperand(), and llvm::MCOperand::getReg().

static bool isCDisp8	(	uint64_t	TSFlags,
		int	Value,
		int &	CValue
	)		[static]

isCDisp8 - Return true if this signed displacement fits in a 8-bit compressed dispacement field.

Definition at line 187 of file X86MCCodeEmitter.cpp.

References llvm::X86II::CD8_Scale_Mask, llvm::X86II::CD8_Scale_Shift, llvm::X86II::EncodingMask, llvm::X86II::EncodingShift, llvm::X86II::EVEX, isDisp8(), and llvm::MipsISD::Ret.

static bool isDisp8

(

int

Value

)

[static]

isDisp8 - Return true if this signed displacement fits in a 8-bit sign-extended field.

Definition at line 181 of file X86MCCodeEmitter.cpp.

Referenced by isCDisp8().

static GlobalOffsetTableExprKind StartsWithGlobalOffsetTable

(

const MCExpr *

Expr

)

[static]

Definition at line 268 of file X86MCCodeEmitter.cpp.

References llvm::MCExpr::Binary, llvm::MCExpr::getKind(), llvm::MCBinaryExpr::getLHS(), llvm::MCSymbol::getName(), llvm::MCBinaryExpr::getRHS(), llvm::MCSymbolRefExpr::getSymbol(), GOT_None, GOT_Normal, GOT_SymDiff, and llvm::MCExpr::SymbolRef.