MCExpr.cpp File Reference

#include "llvm/MC/MCExpr.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCAsmLayout.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"

Include dependency graph for MCExpr.cpp:

Go to the source code of this file.

Namespaces
namespace	stats
Defines
#define	DEBUG_TYPE   "mcexpr"
Functions
static void	AttemptToFoldSymbolOffsetDifference (const MCAssembler *Asm, const MCAsmLayout *Layout, const SectionAddrMap *Addrs, bool InSet, const MCSymbolRefExpr *&A, const MCSymbolRefExpr *&B, int64_t &Addend)
	Helper method for.
static bool	EvaluateSymbolicAdd (const MCAssembler *Asm, const MCAsmLayout *Layout, const SectionAddrMap *Addrs, bool InSet, const MCValue &LHS, const MCSymbolRefExpr *RHS_A, const MCSymbolRefExpr *RHS_B, int64_t RHS_Cst, MCValue &Res)
	Evaluate the result of an add between (conceptually) two MCValues.

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Define Documentation

#define DEBUG_TYPE   "mcexpr"

Definition at line 25 of file MCExpr.cpp.

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Function Documentation

static void AttemptToFoldSymbolOffsetDifference	(	const MCAssembler *	Asm,
		const MCAsmLayout *	Layout,
		const SectionAddrMap *	Addrs,
		bool	InSet,
		const MCSymbolRefExpr *&	A,
		const MCSymbolRefExpr *&	B,
		int64_t &	Addend
	)		[static]

Helper method for.

See also:

EvaluateSymbolAdd().

Definition at line 509 of file MCExpr.cpp.

static bool EvaluateSymbolicAdd	(	const MCAssembler *	Asm,
		const MCAsmLayout *	Layout,
		const SectionAddrMap *	Addrs,
		bool	InSet,
		const MCValue &	LHS,
		const MCSymbolRefExpr *	RHS_A,
		const MCSymbolRefExpr *	RHS_B,
		int64_t	RHS_Cst,
		MCValue &	Res
	)		[static]

Evaluate the result of an add between (conceptually) two MCValues.

This routine conceptually attempts to construct an MCValue: Result = (Result_A - Result_B + Result_Cst) from two MCValue's LHS and RHS where Result = LHS + RHS and Result = (LHS_A - LHS_B + LHS_Cst) + (RHS_A - RHS_B + RHS_Cst).

This routine attempts to aggresively fold the operands such that the result is representable in an MCValue, but may not always succeed.

Returns:

True on success, false if the result is not representable in an MCValue. NOTE: It is really important to have both the Asm and Layout arguments. They might look redundant, but this function can be used before layout is done (see the object streamer for example) and having the Asm argument lets us avoid relaxations early.

Definition at line 589 of file MCExpr.cpp.

Referenced by llvm::MCExpr::EvaluateAsRelocatableImpl().