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//===-- MipsBaseInfo.h - Top level definitions for MIPS MC ------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains small standalone helper functions and enum definitions for
// the Mips target useful for the compiler back-end and the MC libraries.
//
//===----------------------------------------------------------------------===//
#ifndef MIPSBASEINFO_H
#define MIPSBASEINFO_H
#include "MipsFixupKinds.h"
#include "MipsMCTargetDesc.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/Support/DataTypes.h"
#include "llvm/Support/ErrorHandling.h"
namespace llvm {
/// MipsII - This namespace holds all of the target specific flags that
/// instruction info tracks.
///
namespace MipsII {
/// Target Operand Flag enum.
enum TOF {
//===------------------------------------------------------------------===//
// Mips Specific MachineOperand flags.
MO_NO_FLAG,
/// MO_GOT16 - Represents the offset into the global offset table at which
/// the address the relocation entry symbol resides during execution.
MO_GOT16,
MO_GOT,
/// MO_GOT_CALL - Represents the offset into the global offset table at
/// which the address of a call site relocation entry symbol resides
/// during execution. This is different from the above since this flag
/// can only be present in call instructions.
MO_GOT_CALL,
/// MO_GPREL - Represents the offset from the current gp value to be used
/// for the relocatable object file being produced.
MO_GPREL,
/// MO_ABS_HI/LO - Represents the hi or low part of an absolute symbol
/// address.
MO_ABS_HI,
MO_ABS_LO,
/// MO_TLSGD - Represents the offset into the global offset table at which
// the module ID and TSL block offset reside during execution (General
// Dynamic TLS).
MO_TLSGD,
/// MO_TLSLDM - Represents the offset into the global offset table at which
// the module ID and TSL block offset reside during execution (Local
// Dynamic TLS).
MO_TLSLDM,
MO_DTPREL_HI,
MO_DTPREL_LO,
/// MO_GOTTPREL - Represents the offset from the thread pointer (Initial
// Exec TLS).
MO_GOTTPREL,
/// MO_TPREL_HI/LO - Represents the hi and low part of the offset from
// the thread pointer (Local Exec TLS).
MO_TPREL_HI,
MO_TPREL_LO,
// N32/64 Flags.
MO_GPOFF_HI,
MO_GPOFF_LO,
MO_GOT_DISP,
MO_GOT_PAGE,
MO_GOT_OFST,
/// MO_HIGHER/HIGHEST - Represents the highest or higher half word of a
/// 64-bit symbol address.
MO_HIGHER,
MO_HIGHEST,
/// MO_GOT_HI16/LO16, MO_CALL_HI16/LO16 - Relocations used for large GOTs.
MO_GOT_HI16,
MO_GOT_LO16,
MO_CALL_HI16,
MO_CALL_LO16
};
enum {
//===------------------------------------------------------------------===//
// Instruction encodings. These are the standard/most common forms for
// Mips instructions.
//
// Pseudo - This represents an instruction that is a pseudo instruction
// or one that has not been implemented yet. It is illegal to code generate
// it, but tolerated for intermediate implementation stages.
Pseudo = 0,
/// FrmR - This form is for instructions of the format R.
FrmR = 1,
/// FrmI - This form is for instructions of the format I.
FrmI = 2,
/// FrmJ - This form is for instructions of the format J.
FrmJ = 3,
/// FrmFR - This form is for instructions of the format FR.
FrmFR = 4,
/// FrmFI - This form is for instructions of the format FI.
FrmFI = 5,
/// FrmOther - This form is for instructions that have no specific format.
FrmOther = 6,
FormMask = 15
};
}
inline static std::pair<const MCSymbolRefExpr*, int64_t>
MipsGetSymAndOffset(const MCFixup &Fixup) {
MCFixupKind FixupKind = Fixup.getKind();
if ((FixupKind < FirstTargetFixupKind) ||
(FixupKind >= MCFixupKind(Mips::LastTargetFixupKind)))
return std::make_pair((const MCSymbolRefExpr*)0, (int64_t)0);
const MCExpr *Expr = Fixup.getValue();
MCExpr::ExprKind Kind = Expr->getKind();
if (Kind == MCExpr::Binary) {
const MCBinaryExpr *BE = static_cast<const MCBinaryExpr*>(Expr);
const MCExpr *LHS = BE->getLHS();
const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(BE->getRHS());
if ((LHS->getKind() != MCExpr::SymbolRef) || !CE)
return std::make_pair((const MCSymbolRefExpr*)0, (int64_t)0);
return std::make_pair(cast<MCSymbolRefExpr>(LHS), CE->getValue());
}
if (Kind != MCExpr::SymbolRef)
return std::make_pair((const MCSymbolRefExpr*)0, (int64_t)0);
return std::make_pair(cast<MCSymbolRefExpr>(Expr), 0);
}
}
#endif
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