X86MCCodeEmitter.cpp File Reference

#include "MCTargetDesc/X86BaseInfo.h"
#include "MCTargetDesc/X86FixupKinds.h"
#include "MCTargetDesc/X86MCAsmInfo.h"
#include "MCTargetDesc/X86MCTargetDesc.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCFixup.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstrDesc.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/ErrorHandling.h"
#include <cassert>
#include <cstdint>
#include <cstdlib>

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "mccodeemitter"

Enumerations
enum	GlobalOffsetTableExprKind { GOT_None , GOT_Normal , GOT_SymDiff }

Functions
static uint8_t	modRMByte (unsigned Mod, unsigned RegOpcode, unsigned RM)
static void	emitConstant (uint64_t Val, unsigned Size, SmallVectorImpl< char > &CB)
static bool	isDispOrCDisp8 (uint64_t TSFlags, int Value, int &ImmOffset)
	Determine if this immediate can fit in a disp8 or a compressed disp8 for EVEX instructions.
static MCFixupKind	getImmFixupKind (uint64_t TSFlags)
static GlobalOffsetTableExprKind	startsWithGlobalOffsetTable (const MCExpr *Expr)
	Check if this expression starts with GLOBAL_OFFSET_TABLE and if it is of the form GLOBAL_OFFSET_TABLE-symbol.
static bool	hasSecRelSymbolRef (const MCExpr *Expr)
static bool	isPCRel32Branch (const MCInst &MI, const MCInstrInfo &MCII)

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "mccodeemitter"

Definition at line 37 of file X86MCCodeEmitter.cpp.

Enumeration Type Documentation

GlobalOffsetTableExprKind

enum GlobalOffsetTableExprKind

Enumerator
GOT_None
GOT_Normal
GOT_SymDiff

Definition at line 466 of file X86MCCodeEmitter.cpp.

Function Documentation

emitConstant()

void emitConstant ( uint64_t Val, unsigned Size, SmallVectorImpl< char > & CB )

static

Definition at line 406 of file X86MCCodeEmitter.cpp.

References Size.

getImmFixupKind()

MCFixupKind getImmFixupKind ( uint64_t TSFlags )

static

Returns

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

Definition at line 442 of file X86MCCodeEmitter.cpp.

References llvm::FK_Data_1, llvm::FK_Data_2, llvm::FK_Data_4, llvm::FK_Data_8, llvm::X86II::getSizeOfImm(), llvm::X86II::isImmSigned(), llvm_unreachable, llvm::X86::reloc_signed_4byte, and Size.

Referenced by isPCRel32Branch().

hasSecRelSymbolRef()

bool hasSecRelSymbolRef ( const MCExpr * Expr )

static

Definition at line 497 of file X86MCCodeEmitter.cpp.

References llvm::MCExpr::getKind(), llvm::Ref, llvm::X86::S_COFF_SECREL, and llvm::MCExpr::SymbolRef.

isDispOrCDisp8()

bool isDispOrCDisp8 ( uint64_t TSFlags, int Value, int & ImmOffset )

static

Determine if this immediate can fit in a disp8 or a compressed disp8 for EVEX instructions.

will be set to the value to pass to the ImmOffset parameter of emitImmediate.

Definition at line 418 of file X86MCCodeEmitter.cpp.

References assert(), llvm::X86II::CD8_Scale_Mask, llvm::X86II::CD8_Scale_Shift, llvm::X86II::EncodingMask, llvm::X86II::EVEX, llvm::isInt(), and llvm::isPowerOf2_32().

isPCRel32Branch()

bool isPCRel32Branch ( const MCInst & MI, const MCInstrInfo & MCII )

static

Definition at line 505 of file X86MCCodeEmitter.cpp.

References llvm::dyn_cast(), llvm::FK_Data_4, llvm::MCInstrInfo::get(), getImmFixupKind(), llvm::X86II::getOperandBias(), llvm::X86II::isImmPCRel(), MI, llvm::Ref, and llvm::X86::S_None.

modRMByte()

uint8_t modRMByte ( unsigned Mod, unsigned RegOpcode, unsigned RM )

static

Definition at line 401 of file X86MCCodeEmitter.cpp.

References assert(), and Mod.

startsWithGlobalOffsetTable()

GlobalOffsetTableExprKind startsWithGlobalOffsetTable ( const MCExpr * Expr )

static

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.

TODO: Move this to X86AsmBackend.cpp at relocation decision phase so that we don't have to mess with MCExpr.

Definition at line 477 of file X86MCCodeEmitter.cpp.

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