You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
486 lines
15 KiB
486 lines
15 KiB
//===- MCExpr.h - Assembly Level Expressions --------------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_MC_MCEXPR_H
|
|
#define LLVM_MC_MCEXPR_H
|
|
|
|
#include "llvm/ADT/DenseMap.h"
|
|
#include "llvm/Support/Casting.h"
|
|
#include "llvm/Support/DataTypes.h"
|
|
|
|
namespace llvm {
|
|
class MCAsmLayout;
|
|
class MCAssembler;
|
|
class MCContext;
|
|
class MCSection;
|
|
class MCSectionData;
|
|
class MCSymbol;
|
|
class MCValue;
|
|
class raw_ostream;
|
|
class StringRef;
|
|
typedef DenseMap<const MCSectionData*, uint64_t> SectionAddrMap;
|
|
|
|
/// MCExpr - Base class for the full range of assembler expressions which are
|
|
/// needed for parsing.
|
|
class MCExpr {
|
|
public:
|
|
enum ExprKind {
|
|
Binary, ///< Binary expressions.
|
|
Constant, ///< Constant expressions.
|
|
SymbolRef, ///< References to labels and assigned expressions.
|
|
Unary, ///< Unary expressions.
|
|
Target ///< Target specific expression.
|
|
};
|
|
|
|
private:
|
|
ExprKind Kind;
|
|
|
|
MCExpr(const MCExpr&) LLVM_DELETED_FUNCTION;
|
|
void operator=(const MCExpr&) LLVM_DELETED_FUNCTION;
|
|
|
|
bool EvaluateAsAbsolute(int64_t &Res, const MCAssembler *Asm,
|
|
const MCAsmLayout *Layout,
|
|
const SectionAddrMap *Addrs) const;
|
|
protected:
|
|
explicit MCExpr(ExprKind _Kind) : Kind(_Kind) {}
|
|
|
|
bool EvaluateAsRelocatableImpl(MCValue &Res, const MCAssembler *Asm,
|
|
const MCAsmLayout *Layout,
|
|
const SectionAddrMap *Addrs,
|
|
bool InSet) const;
|
|
public:
|
|
/// @name Accessors
|
|
/// @{
|
|
|
|
ExprKind getKind() const { return Kind; }
|
|
|
|
/// @}
|
|
/// @name Utility Methods
|
|
/// @{
|
|
|
|
void print(raw_ostream &OS) const;
|
|
void dump() const;
|
|
|
|
/// @}
|
|
/// @name Expression Evaluation
|
|
/// @{
|
|
|
|
/// EvaluateAsAbsolute - Try to evaluate the expression to an absolute value.
|
|
///
|
|
/// @param Res - The absolute value, if evaluation succeeds.
|
|
/// @param Layout - The assembler layout object to use for evaluating symbol
|
|
/// values. If not given, then only non-symbolic expressions will be
|
|
/// evaluated.
|
|
/// @result - True on success.
|
|
bool EvaluateAsAbsolute(int64_t &Res, const MCAsmLayout &Layout,
|
|
const SectionAddrMap &Addrs) const;
|
|
bool EvaluateAsAbsolute(int64_t &Res) const;
|
|
bool EvaluateAsAbsolute(int64_t &Res, const MCAssembler &Asm) const;
|
|
bool EvaluateAsAbsolute(int64_t &Res, const MCAsmLayout &Layout) const;
|
|
|
|
/// EvaluateAsRelocatable - Try to evaluate the expression to a relocatable
|
|
/// value, i.e. an expression of the fixed form (a - b + constant).
|
|
///
|
|
/// @param Res - The relocatable value, if evaluation succeeds.
|
|
/// @param Layout - The assembler layout object to use for evaluating values.
|
|
/// @result - True on success.
|
|
bool EvaluateAsRelocatable(MCValue &Res, const MCAsmLayout &Layout) const;
|
|
|
|
/// FindAssociatedSection - Find the "associated section" for this expression,
|
|
/// which is currently defined as the absolute section for constants, or
|
|
/// otherwise the section associated with the first defined symbol in the
|
|
/// expression.
|
|
const MCSection *FindAssociatedSection() const;
|
|
|
|
/// @}
|
|
};
|
|
|
|
inline raw_ostream &operator<<(raw_ostream &OS, const MCExpr &E) {
|
|
E.print(OS);
|
|
return OS;
|
|
}
|
|
|
|
//// MCConstantExpr - Represent a constant integer expression.
|
|
class MCConstantExpr : public MCExpr {
|
|
int64_t Value;
|
|
|
|
explicit MCConstantExpr(int64_t _Value)
|
|
: MCExpr(MCExpr::Constant), Value(_Value) {}
|
|
|
|
public:
|
|
/// @name Construction
|
|
/// @{
|
|
|
|
static const MCConstantExpr *Create(int64_t Value, MCContext &Ctx);
|
|
|
|
/// @}
|
|
/// @name Accessors
|
|
/// @{
|
|
|
|
int64_t getValue() const { return Value; }
|
|
|
|
/// @}
|
|
|
|
static bool classof(const MCExpr *E) {
|
|
return E->getKind() == MCExpr::Constant;
|
|
}
|
|
};
|
|
|
|
/// MCSymbolRefExpr - Represent a reference to a symbol from inside an
|
|
/// expression.
|
|
///
|
|
/// A symbol reference in an expression may be a use of a label, a use of an
|
|
/// assembler variable (defined constant), or constitute an implicit definition
|
|
/// of the symbol as external.
|
|
class MCSymbolRefExpr : public MCExpr {
|
|
public:
|
|
enum VariantKind {
|
|
VK_None,
|
|
VK_Invalid,
|
|
|
|
VK_GOT,
|
|
VK_GOTOFF,
|
|
VK_GOTPCREL,
|
|
VK_GOTTPOFF,
|
|
VK_INDNTPOFF,
|
|
VK_NTPOFF,
|
|
VK_GOTNTPOFF,
|
|
VK_PLT,
|
|
VK_TLSGD,
|
|
VK_TLSLD,
|
|
VK_TLSLDM,
|
|
VK_TPOFF,
|
|
VK_DTPOFF,
|
|
VK_TLVP, // Mach-O thread local variable relocation
|
|
VK_SECREL,
|
|
// FIXME: We'd really like to use the generic Kinds listed above for these.
|
|
VK_ARM_NONE,
|
|
VK_ARM_PLT, // ARM-style PLT references. i.e., (PLT) instead of @PLT
|
|
VK_ARM_TLSGD, // ditto for TLSGD, GOT, GOTOFF, TPOFF and GOTTPOFF
|
|
VK_ARM_GOT,
|
|
VK_ARM_GOTOFF,
|
|
VK_ARM_TPOFF,
|
|
VK_ARM_GOTTPOFF,
|
|
VK_ARM_TARGET1,
|
|
VK_ARM_TARGET2,
|
|
VK_ARM_PREL31,
|
|
|
|
VK_PPC_TOC, // TOC base
|
|
VK_PPC_TOC_ENTRY, // TOC entry
|
|
VK_PPC_DARWIN_HA16, // ha16(symbol)
|
|
VK_PPC_DARWIN_LO16, // lo16(symbol)
|
|
VK_PPC_GAS_HA16, // symbol@ha
|
|
VK_PPC_GAS_LO16, // symbol@l
|
|
VK_PPC_TPREL16_HA, // symbol@tprel@ha
|
|
VK_PPC_TPREL16_LO, // symbol@tprel@l
|
|
VK_PPC_DTPREL16_HA, // symbol@dtprel@ha
|
|
VK_PPC_DTPREL16_LO, // symbol@dtprel@l
|
|
VK_PPC_TOC16_HA, // symbol@toc@ha
|
|
VK_PPC_TOC16_LO, // symbol@toc@l
|
|
VK_PPC_GOT_TPREL16_HA, // symbol@got@tprel@ha
|
|
VK_PPC_GOT_TPREL16_LO, // symbol@got@tprel@l
|
|
VK_PPC_TLS, // symbol@tls
|
|
VK_PPC_GOT_TLSGD16_HA, // symbol@got@tlsgd@ha
|
|
VK_PPC_GOT_TLSGD16_LO, // symbol@got@tlsgd@l
|
|
VK_PPC_TLSGD, // symbol@tlsgd
|
|
VK_PPC_GOT_TLSLD16_HA, // symbol@got@tlsld@ha
|
|
VK_PPC_GOT_TLSLD16_LO, // symbol@got@tlsld@l
|
|
VK_PPC_TLSLD, // symbol@tlsld
|
|
|
|
VK_Mips_GPREL,
|
|
VK_Mips_GOT_CALL,
|
|
VK_Mips_GOT16,
|
|
VK_Mips_GOT,
|
|
VK_Mips_ABS_HI,
|
|
VK_Mips_ABS_LO,
|
|
VK_Mips_TLSGD,
|
|
VK_Mips_TLSLDM,
|
|
VK_Mips_DTPREL_HI,
|
|
VK_Mips_DTPREL_LO,
|
|
VK_Mips_GOTTPREL,
|
|
VK_Mips_TPREL_HI,
|
|
VK_Mips_TPREL_LO,
|
|
VK_Mips_GPOFF_HI,
|
|
VK_Mips_GPOFF_LO,
|
|
VK_Mips_GOT_DISP,
|
|
VK_Mips_GOT_PAGE,
|
|
VK_Mips_GOT_OFST,
|
|
VK_Mips_HIGHER,
|
|
VK_Mips_HIGHEST,
|
|
VK_Mips_GOT_HI16,
|
|
VK_Mips_GOT_LO16,
|
|
VK_Mips_CALL_HI16,
|
|
VK_Mips_CALL_LO16,
|
|
|
|
VK_COFF_IMGREL32 // symbol@imgrel (image-relative)
|
|
};
|
|
|
|
private:
|
|
/// The symbol being referenced.
|
|
const MCSymbol *Symbol;
|
|
|
|
/// The symbol reference modifier.
|
|
const VariantKind Kind;
|
|
|
|
explicit MCSymbolRefExpr(const MCSymbol *_Symbol, VariantKind _Kind)
|
|
: MCExpr(MCExpr::SymbolRef), Symbol(_Symbol), Kind(_Kind) {
|
|
assert(Symbol);
|
|
}
|
|
|
|
public:
|
|
/// @name Construction
|
|
/// @{
|
|
|
|
static const MCSymbolRefExpr *Create(const MCSymbol *Symbol, MCContext &Ctx) {
|
|
return MCSymbolRefExpr::Create(Symbol, VK_None, Ctx);
|
|
}
|
|
|
|
static const MCSymbolRefExpr *Create(const MCSymbol *Symbol, VariantKind Kind,
|
|
MCContext &Ctx);
|
|
static const MCSymbolRefExpr *Create(StringRef Name, VariantKind Kind,
|
|
MCContext &Ctx);
|
|
|
|
/// @}
|
|
/// @name Accessors
|
|
/// @{
|
|
|
|
const MCSymbol &getSymbol() const { return *Symbol; }
|
|
|
|
VariantKind getKind() const { return Kind; }
|
|
|
|
/// @}
|
|
/// @name Static Utility Functions
|
|
/// @{
|
|
|
|
static StringRef getVariantKindName(VariantKind Kind);
|
|
|
|
static VariantKind getVariantKindForName(StringRef Name);
|
|
|
|
/// @}
|
|
|
|
static bool classof(const MCExpr *E) {
|
|
return E->getKind() == MCExpr::SymbolRef;
|
|
}
|
|
};
|
|
|
|
/// MCUnaryExpr - Unary assembler expressions.
|
|
class MCUnaryExpr : public MCExpr {
|
|
public:
|
|
enum Opcode {
|
|
LNot, ///< Logical negation.
|
|
Minus, ///< Unary minus.
|
|
Not, ///< Bitwise negation.
|
|
Plus ///< Unary plus.
|
|
};
|
|
|
|
private:
|
|
Opcode Op;
|
|
const MCExpr *Expr;
|
|
|
|
MCUnaryExpr(Opcode _Op, const MCExpr *_Expr)
|
|
: MCExpr(MCExpr::Unary), Op(_Op), Expr(_Expr) {}
|
|
|
|
public:
|
|
/// @name Construction
|
|
/// @{
|
|
|
|
static const MCUnaryExpr *Create(Opcode Op, const MCExpr *Expr,
|
|
MCContext &Ctx);
|
|
static const MCUnaryExpr *CreateLNot(const MCExpr *Expr, MCContext &Ctx) {
|
|
return Create(LNot, Expr, Ctx);
|
|
}
|
|
static const MCUnaryExpr *CreateMinus(const MCExpr *Expr, MCContext &Ctx) {
|
|
return Create(Minus, Expr, Ctx);
|
|
}
|
|
static const MCUnaryExpr *CreateNot(const MCExpr *Expr, MCContext &Ctx) {
|
|
return Create(Not, Expr, Ctx);
|
|
}
|
|
static const MCUnaryExpr *CreatePlus(const MCExpr *Expr, MCContext &Ctx) {
|
|
return Create(Plus, Expr, Ctx);
|
|
}
|
|
|
|
/// @}
|
|
/// @name Accessors
|
|
/// @{
|
|
|
|
/// getOpcode - Get the kind of this unary expression.
|
|
Opcode getOpcode() const { return Op; }
|
|
|
|
/// getSubExpr - Get the child of this unary expression.
|
|
const MCExpr *getSubExpr() const { return Expr; }
|
|
|
|
/// @}
|
|
|
|
static bool classof(const MCExpr *E) {
|
|
return E->getKind() == MCExpr::Unary;
|
|
}
|
|
};
|
|
|
|
/// MCBinaryExpr - Binary assembler expressions.
|
|
class MCBinaryExpr : public MCExpr {
|
|
public:
|
|
enum Opcode {
|
|
Add, ///< Addition.
|
|
And, ///< Bitwise and.
|
|
Div, ///< Signed division.
|
|
EQ, ///< Equality comparison.
|
|
GT, ///< Signed greater than comparison (result is either 0 or some
|
|
///< target-specific non-zero value)
|
|
GTE, ///< Signed greater than or equal comparison (result is either 0 or
|
|
///< some target-specific non-zero value).
|
|
LAnd, ///< Logical and.
|
|
LOr, ///< Logical or.
|
|
LT, ///< Signed less than comparison (result is either 0 or
|
|
///< some target-specific non-zero value).
|
|
LTE, ///< Signed less than or equal comparison (result is either 0 or
|
|
///< some target-specific non-zero value).
|
|
Mod, ///< Signed remainder.
|
|
Mul, ///< Multiplication.
|
|
NE, ///< Inequality comparison.
|
|
Or, ///< Bitwise or.
|
|
Shl, ///< Shift left.
|
|
Shr, ///< Shift right (arithmetic or logical, depending on target)
|
|
Sub, ///< Subtraction.
|
|
Xor ///< Bitwise exclusive or.
|
|
};
|
|
|
|
private:
|
|
Opcode Op;
|
|
const MCExpr *LHS, *RHS;
|
|
|
|
MCBinaryExpr(Opcode _Op, const MCExpr *_LHS, const MCExpr *_RHS)
|
|
: MCExpr(MCExpr::Binary), Op(_Op), LHS(_LHS), RHS(_RHS) {}
|
|
|
|
public:
|
|
/// @name Construction
|
|
/// @{
|
|
|
|
static const MCBinaryExpr *Create(Opcode Op, const MCExpr *LHS,
|
|
const MCExpr *RHS, MCContext &Ctx);
|
|
static const MCBinaryExpr *CreateAdd(const MCExpr *LHS, const MCExpr *RHS,
|
|
MCContext &Ctx) {
|
|
return Create(Add, LHS, RHS, Ctx);
|
|
}
|
|
static const MCBinaryExpr *CreateAnd(const MCExpr *LHS, const MCExpr *RHS,
|
|
MCContext &Ctx) {
|
|
return Create(And, LHS, RHS, Ctx);
|
|
}
|
|
static const MCBinaryExpr *CreateDiv(const MCExpr *LHS, const MCExpr *RHS,
|
|
MCContext &Ctx) {
|
|
return Create(Div, LHS, RHS, Ctx);
|
|
}
|
|
static const MCBinaryExpr *CreateEQ(const MCExpr *LHS, const MCExpr *RHS,
|
|
MCContext &Ctx) {
|
|
return Create(EQ, LHS, RHS, Ctx);
|
|
}
|
|
static const MCBinaryExpr *CreateGT(const MCExpr *LHS, const MCExpr *RHS,
|
|
MCContext &Ctx) {
|
|
return Create(GT, LHS, RHS, Ctx);
|
|
}
|
|
static const MCBinaryExpr *CreateGTE(const MCExpr *LHS, const MCExpr *RHS,
|
|
MCContext &Ctx) {
|
|
return Create(GTE, LHS, RHS, Ctx);
|
|
}
|
|
static const MCBinaryExpr *CreateLAnd(const MCExpr *LHS, const MCExpr *RHS,
|
|
MCContext &Ctx) {
|
|
return Create(LAnd, LHS, RHS, Ctx);
|
|
}
|
|
static const MCBinaryExpr *CreateLOr(const MCExpr *LHS, const MCExpr *RHS,
|
|
MCContext &Ctx) {
|
|
return Create(LOr, LHS, RHS, Ctx);
|
|
}
|
|
static const MCBinaryExpr *CreateLT(const MCExpr *LHS, const MCExpr *RHS,
|
|
MCContext &Ctx) {
|
|
return Create(LT, LHS, RHS, Ctx);
|
|
}
|
|
static const MCBinaryExpr *CreateLTE(const MCExpr *LHS, const MCExpr *RHS,
|
|
MCContext &Ctx) {
|
|
return Create(LTE, LHS, RHS, Ctx);
|
|
}
|
|
static const MCBinaryExpr *CreateMod(const MCExpr *LHS, const MCExpr *RHS,
|
|
MCContext &Ctx) {
|
|
return Create(Mod, LHS, RHS, Ctx);
|
|
}
|
|
static const MCBinaryExpr *CreateMul(const MCExpr *LHS, const MCExpr *RHS,
|
|
MCContext &Ctx) {
|
|
return Create(Mul, LHS, RHS, Ctx);
|
|
}
|
|
static const MCBinaryExpr *CreateNE(const MCExpr *LHS, const MCExpr *RHS,
|
|
MCContext &Ctx) {
|
|
return Create(NE, LHS, RHS, Ctx);
|
|
}
|
|
static const MCBinaryExpr *CreateOr(const MCExpr *LHS, const MCExpr *RHS,
|
|
MCContext &Ctx) {
|
|
return Create(Or, LHS, RHS, Ctx);
|
|
}
|
|
static const MCBinaryExpr *CreateShl(const MCExpr *LHS, const MCExpr *RHS,
|
|
MCContext &Ctx) {
|
|
return Create(Shl, LHS, RHS, Ctx);
|
|
}
|
|
static const MCBinaryExpr *CreateShr(const MCExpr *LHS, const MCExpr *RHS,
|
|
MCContext &Ctx) {
|
|
return Create(Shr, LHS, RHS, Ctx);
|
|
}
|
|
static const MCBinaryExpr *CreateSub(const MCExpr *LHS, const MCExpr *RHS,
|
|
MCContext &Ctx) {
|
|
return Create(Sub, LHS, RHS, Ctx);
|
|
}
|
|
static const MCBinaryExpr *CreateXor(const MCExpr *LHS, const MCExpr *RHS,
|
|
MCContext &Ctx) {
|
|
return Create(Xor, LHS, RHS, Ctx);
|
|
}
|
|
|
|
/// @}
|
|
/// @name Accessors
|
|
/// @{
|
|
|
|
/// getOpcode - Get the kind of this binary expression.
|
|
Opcode getOpcode() const { return Op; }
|
|
|
|
/// getLHS - Get the left-hand side expression of the binary operator.
|
|
const MCExpr *getLHS() const { return LHS; }
|
|
|
|
/// getRHS - Get the right-hand side expression of the binary operator.
|
|
const MCExpr *getRHS() const { return RHS; }
|
|
|
|
/// @}
|
|
|
|
static bool classof(const MCExpr *E) {
|
|
return E->getKind() == MCExpr::Binary;
|
|
}
|
|
};
|
|
|
|
/// MCTargetExpr - This is an extension point for target-specific MCExpr
|
|
/// subclasses to implement.
|
|
///
|
|
/// NOTE: All subclasses are required to have trivial destructors because
|
|
/// MCExprs are bump pointer allocated and not destructed.
|
|
class MCTargetExpr : public MCExpr {
|
|
virtual void anchor();
|
|
protected:
|
|
MCTargetExpr() : MCExpr(Target) {}
|
|
virtual ~MCTargetExpr() {}
|
|
public:
|
|
|
|
virtual void PrintImpl(raw_ostream &OS) const = 0;
|
|
virtual bool EvaluateAsRelocatableImpl(MCValue &Res,
|
|
const MCAsmLayout *Layout) const = 0;
|
|
virtual void AddValueSymbols(MCAssembler *) const = 0;
|
|
virtual const MCSection *FindAssociatedSection() const = 0;
|
|
|
|
virtual void fixELFSymbolsInTLSFixups(MCAssembler &) const = 0;
|
|
|
|
static bool classof(const MCExpr *E) {
|
|
return E->getKind() == MCExpr::Target;
|
|
}
|
|
};
|
|
|
|
} // end namespace llvm
|
|
|
|
#endif
|