#include <MCDwarf.h>

Collaboration diagram for llvm::MCCFIInstruction:

Public Types
enum	OpType { OpSameValue, OpRememberState, OpRestoreState, OpOffset, OpDefCfaRegister, OpDefCfaOffset, OpDefCfa, OpRelOffset, OpAdjustCfaOffset, OpEscape, OpRestore, OpUndefined, OpRegister, OpWindowSave }
Public Member Functions
OpType	getOperation () const
MCSymbol *	getLabel () const
unsigned	getRegister () const
unsigned	getRegister2 () const
int	getOffset () const
StringRef	getValues () const
Static Public Member Functions
static MCCFIInstruction	createDefCfa (MCSymbol *L, unsigned Register, int Offset)
	.cfi_def_cfa defines a rule for computing CFA as: take address from Register and add Offset to it.
static MCCFIInstruction	createDefCfaRegister (MCSymbol *L, unsigned Register)
	.cfi_def_cfa_register modifies a rule for computing CFA. From now on Register will be used instead of the old one. Offset remains the same.
static MCCFIInstruction	createDefCfaOffset (MCSymbol *L, int Offset)
	.cfi_def_cfa_offset modifies a rule for computing CFA. Register remains the same, but offset is new. Note that it is the absolute offset that will be added to a defined register to the compute CFA address.
static MCCFIInstruction	createAdjustCfaOffset (MCSymbol *L, int Adjustment)
	.cfi_adjust_cfa_offset Same as .cfi_def_cfa_offset, but Offset is a relative value that is added/subtracted from the previous offset.
static MCCFIInstruction	createOffset (MCSymbol *L, unsigned Register, int Offset)
	.cfi_offset Previous value of Register is saved at offset Offset from CFA.
static MCCFIInstruction	createRelOffset (MCSymbol *L, unsigned Register, int Offset)
	.cfi_rel_offset Previous value of Register is saved at offset Offset from the current CFA register. This is transformed to .cfi_offset using the known displacement of the CFA register from the CFA.
static MCCFIInstruction	createRegister (MCSymbol *L, unsigned Register1, unsigned Register2)
	.cfi_register Previous value of Register1 is saved in register Register2.
static MCCFIInstruction	createWindowSave (MCSymbol *L)
	.cfi_window_save SPARC register window is saved.
static MCCFIInstruction	createRestore (MCSymbol *L, unsigned Register)
	.cfi_restore says that the rule for Register is now the same as it was at the beginning of the function, after all initial instructions added by .cfi_startproc were executed.
static MCCFIInstruction	createUndefined (MCSymbol *L, unsigned Register)
	.cfi_undefined From now on the previous value of Register can't be restored anymore.
static MCCFIInstruction	createSameValue (MCSymbol *L, unsigned Register)
	.cfi_same_value Current value of Register is the same as in the previous frame. I.e., no restoration is needed.
static MCCFIInstruction	createRememberState (MCSymbol *L)
	.cfi_remember_state Save all current rules for all registers.
static MCCFIInstruction	createRestoreState (MCSymbol *L)
	.cfi_restore_state Restore the previously saved state.
static MCCFIInstruction	createEscape (MCSymbol *L, StringRef Vals)
	.cfi_escape Allows the user to add arbitrary bytes to the unwind info.

Detailed Description

Definition at line 307 of file MCDwarf.h.

Member Enumeration Documentation

enum llvm::MCCFIInstruction::OpType

Enumerator:

OpSameValue
OpRememberState
OpRestoreState
OpOffset
OpDefCfaRegister
OpDefCfaOffset
OpDefCfa
OpRelOffset
OpAdjustCfaOffset
OpEscape
OpRestore
OpUndefined
OpRegister
OpWindowSave

Definition at line 309 of file MCDwarf.h.

Member Function Documentation

static MCCFIInstruction llvm::MCCFIInstruction::createAdjustCfaOffset	(	MCSymbol *	L,
		int	Adjustment
	)		`[inline, static]`

.cfi_adjust_cfa_offset Same as .cfi_def_cfa_offset, but Offset is a relative value that is added/subtracted from the previous offset.

Definition at line 371 of file MCDwarf.h.

References OpAdjustCfaOffset.

Referenced by llvm::MCStreamer::EmitCFIAdjustCfaOffset().

static MCCFIInstruction llvm::MCCFIInstruction::createDefCfa	(	MCSymbol *	L,
		unsigned	Register,
		int	Offset
	)		`[inline, static]`

.cfi_def_cfa defines a rule for computing CFA as: take address from Register and add Offset to it.

Definition at line 350 of file MCDwarf.h.

References OpDefCfa.

Referenced by createAArch64MCAsmInfo(), createARMMCAsmInfo(), createHexagonMCAsmInfo(), createMipsMCAsmInfo(), createPPCMCAsmInfo(), createSparcMCAsmInfo(), createSparcV9MCAsmInfo(), createSystemZMCAsmInfo(), createX86MCAsmInfo(), createXCoreMCAsmInfo(), llvm::MCStreamer::EmitCFIDefCfa(), llvm::Thumb1FrameLowering::emitPrologue(), llvm::ARMFrameLowering::emitPrologue(), and llvm::AArch64FrameLowering::emitPrologue().

static MCCFIInstruction llvm::MCCFIInstruction::createDefCfaOffset	(	MCSymbol *	L,
		int	Offset
	)		`[inline, static]`

.cfi_def_cfa_offset modifies a rule for computing CFA. Register remains the same, but offset is new. Note that it is the absolute offset that will be added to a defined register to the compute CFA address.

Definition at line 364 of file MCDwarf.h.

References OpDefCfaOffset.

Referenced by llvm::ARMFrameLowering::adjustForSegmentedStacks(), llvm::MCStreamer::EmitCFIDefCfaOffset(), EmitDefCfaOffset(), llvm::Mips16FrameLowering::emitPrologue(), llvm::MipsSEFrameLowering::emitPrologue(), llvm::Thumb1FrameLowering::emitPrologue(), llvm::ARMFrameLowering::emitPrologue(), llvm::PPCFrameLowering::emitPrologue(), llvm::AArch64FrameLowering::emitPrologue(), llvm::X86FrameLowering::emitPrologue(), and llvm::SystemZFrameLowering::emitPrologue().

static MCCFIInstruction llvm::MCCFIInstruction::createDefCfaRegister	(	MCSymbol *	L,
		unsigned	Register
	)		`[inline, static]`

.cfi_def_cfa_register modifies a rule for computing CFA. From now on Register will be used instead of the old one. Offset remains the same.

Definition at line 357 of file MCDwarf.h.

References OpDefCfaRegister.

Referenced by llvm::MCStreamer::EmitCFIDefCfaRegister(), EmitDefCfaRegister(), llvm::MipsSEFrameLowering::emitPrologue(), llvm::SparcFrameLowering::emitPrologue(), llvm::Thumb1FrameLowering::emitPrologue(), llvm::ARMFrameLowering::emitPrologue(), llvm::PPCFrameLowering::emitPrologue(), llvm::X86FrameLowering::emitPrologue(), and llvm::SystemZFrameLowering::emitPrologue().

static MCCFIInstruction llvm::MCCFIInstruction::createEscape	(	MCSymbol *	L,
		StringRef	Vals
	)		`[inline, static]`

.cfi_escape Allows the user to add arbitrary bytes to the unwind info.

Definition at line 433 of file MCDwarf.h.

References OpEscape.

Referenced by llvm::MCStreamer::EmitCFIEscape().

static MCCFIInstruction llvm::MCCFIInstruction::createOffset	(	MCSymbol *	L,
		unsigned	Register,
		int	Offset
	)		`[inline, static]`

.cfi_offset Previous value of Register is saved at offset Offset from CFA.

Definition at line 377 of file MCDwarf.h.

References OpOffset.

static MCCFIInstruction llvm::MCCFIInstruction::createRegister	(	MCSymbol *	L,
		unsigned	Register1,
		unsigned	Register2
	)		`[inline, static]`

.cfi_register Previous value of Register1 is saved in register Register2.

Definition at line 392 of file MCDwarf.h.

References OpRegister.

Referenced by llvm::MCStreamer::EmitCFIRegister(), and llvm::SparcFrameLowering::emitPrologue().

static MCCFIInstruction llvm::MCCFIInstruction::createRelOffset	(	MCSymbol *	L,
		unsigned	Register,
		int	Offset
	)		`[inline, static]`

.cfi_rel_offset Previous value of Register is saved at offset Offset from the current CFA register. This is transformed to .cfi_offset using the known displacement of the CFA register from the CFA.

Definition at line 385 of file MCDwarf.h.

References OpRelOffset.

Referenced by llvm::MCStreamer::EmitCFIRelOffset().

static MCCFIInstruction llvm::MCCFIInstruction::createRememberState ( MCSymbol * L ) [inline, static]

.cfi_remember_state Save all current rules for all registers.

Definition at line 422 of file MCDwarf.h.

References OpRememberState.

Referenced by llvm::MCStreamer::EmitCFIRememberState().

static MCCFIInstruction llvm::MCCFIInstruction::createRestore	(	MCSymbol *	L,
		unsigned	Register
	)		`[inline, static]`

.cfi_restore says that the rule for Register is now the same as it was at the beginning of the function, after all initial instructions added by .cfi_startproc were executed.

Definition at line 405 of file MCDwarf.h.

References OpRestore.

Referenced by llvm::MCStreamer::EmitCFIRestore().

static MCCFIInstruction llvm::MCCFIInstruction::createRestoreState ( MCSymbol * L ) [inline, static]