forked from OSchip/llvm-project
271 lines
12 KiB
C++
271 lines
12 KiB
C++
//===- X86RecognizableInstr.h - Disassembler instruction spec ----*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file is part of the X86 Disassembler Emitter.
|
|
// It contains the interface of a single recognizable instruction.
|
|
// Documentation for the disassembler emitter in general can be found in
|
|
// X86DisasemblerEmitter.h.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef X86RECOGNIZABLEINSTR_H
|
|
#define X86RECOGNIZABLEINSTR_H
|
|
|
|
#include "CodeGenTarget.h"
|
|
#include "X86DisassemblerTables.h"
|
|
#include "llvm/ADT/SmallVector.h"
|
|
#include "llvm/Support/DataTypes.h"
|
|
#include "llvm/TableGen/Record.h"
|
|
|
|
namespace llvm {
|
|
|
|
namespace X86Disassembler {
|
|
|
|
/// RecognizableInstr - Encapsulates all information required to decode a single
|
|
/// instruction, as extracted from the LLVM instruction tables. Has methods
|
|
/// to interpret the information available in the LLVM tables, and to emit the
|
|
/// instruction into DisassemblerTables.
|
|
class RecognizableInstr {
|
|
private:
|
|
/// The opcode of the instruction, as used in an MCInst
|
|
InstrUID UID;
|
|
/// The record from the .td files corresponding to this instruction
|
|
const Record* Rec;
|
|
/// The prefix field from the record
|
|
uint8_t Prefix;
|
|
/// The opcode field from the record; this is the opcode used in the Intel
|
|
/// encoding and therefore distinct from the UID
|
|
uint8_t Opcode;
|
|
/// The form field from the record
|
|
uint8_t Form;
|
|
/// The segment override field from the record
|
|
uint8_t SegOvr;
|
|
/// The hasOpSizePrefix field from the record
|
|
bool HasOpSizePrefix;
|
|
/// The hasAdSizePrefix field from the record
|
|
bool HasAdSizePrefix;
|
|
/// The hasREX_WPrefix field from the record
|
|
bool HasREX_WPrefix;
|
|
/// The hasVEXPrefix field from the record
|
|
bool HasVEXPrefix;
|
|
/// The hasVEX_4VPrefix field from the record
|
|
bool HasVEX_4VPrefix;
|
|
/// The hasVEX_4VOp3Prefix field from the record
|
|
bool HasVEX_4VOp3Prefix;
|
|
/// The hasVEX_WPrefix field from the record
|
|
bool HasVEX_WPrefix;
|
|
/// Inferred from the operands; indicates whether the L bit in the VEX prefix is set
|
|
bool HasVEX_LPrefix;
|
|
/// The hasMemOp4Prefix field from the record
|
|
bool HasMemOp4Prefix;
|
|
/// The ignoreVEX_L field from the record
|
|
bool IgnoresVEX_L;
|
|
/// The hasEVEXPrefix field from the record
|
|
bool HasEVEXPrefix;
|
|
/// The hasEVEX_L2Prefix field from the record
|
|
bool HasEVEX_L2Prefix;
|
|
/// The hasEVEX_K field from the record
|
|
bool HasEVEX_K;
|
|
/// The hasEVEX_KZ field from the record
|
|
bool HasEVEX_KZ;
|
|
/// The hasEVEX_B field from the record
|
|
bool HasEVEX_B;
|
|
/// The hasLockPrefix field from the record
|
|
bool HasLockPrefix;
|
|
/// The isCodeGenOnly field from the record
|
|
bool IsCodeGenOnly;
|
|
/// The ForceDisassemble field from the record
|
|
bool ForceDisassemble;
|
|
// Whether the instruction has the predicate "In64BitMode"
|
|
bool Is64Bit;
|
|
// Whether the instruction has the predicate "In32BitMode"
|
|
bool Is32Bit;
|
|
|
|
/// The instruction name as listed in the tables
|
|
std::string Name;
|
|
/// The AT&T AsmString for the instruction
|
|
std::string AsmString;
|
|
|
|
/// Indicates whether the instruction is SSE
|
|
bool IsSSE;
|
|
/// Indicates whether the instruction should be emitted into the decode
|
|
/// tables; regardless, it will be emitted into the instruction info table
|
|
bool ShouldBeEmitted;
|
|
|
|
/// The operands of the instruction, as listed in the CodeGenInstruction.
|
|
/// They are not one-to-one with operands listed in the MCInst; for example,
|
|
/// memory operands expand to 5 operands in the MCInst
|
|
const std::vector<CGIOperandList::OperandInfo>* Operands;
|
|
|
|
/// The description of the instruction that is emitted into the instruction
|
|
/// info table
|
|
InstructionSpecifier* Spec;
|
|
|
|
/// insnContext - Returns the primary context in which the instruction is
|
|
/// valid.
|
|
///
|
|
/// @return - The context in which the instruction is valid.
|
|
InstructionContext insnContext() const;
|
|
|
|
enum filter_ret {
|
|
FILTER_STRONG, // instruction has no place in the instruction tables
|
|
FILTER_WEAK, // instruction may conflict, and should be eliminated if
|
|
// it does
|
|
FILTER_NORMAL // instruction should have high priority and generate an
|
|
// error if it conflcits with any other FILTER_NORMAL
|
|
// instruction
|
|
};
|
|
|
|
/// filter - Determines whether the instruction should be decodable. Some
|
|
/// instructions are pure intrinsics and use unencodable operands; many
|
|
/// synthetic instructions are duplicates of other instructions; other
|
|
/// instructions only differ in the logical way in which they are used, and
|
|
/// have the same decoding. Because these would cause decode conflicts,
|
|
/// they must be filtered out.
|
|
///
|
|
/// @return - The degree of filtering to be applied (see filter_ret).
|
|
filter_ret filter() const;
|
|
|
|
/// hasFROperands - Returns true if any operand is a FR operand.
|
|
bool hasFROperands() const;
|
|
|
|
/// typeFromString - Translates an operand type from the string provided in
|
|
/// the LLVM tables to an OperandType for use in the operand specifier.
|
|
///
|
|
/// @param s - The string, as extracted by calling Rec->getName()
|
|
/// on a CodeGenInstruction::OperandInfo.
|
|
/// @param isSSE - Indicates whether the instruction is an SSE
|
|
/// instruction. For SSE instructions, immediates are
|
|
/// fixed-size rather than being affected by the
|
|
/// mandatory OpSize prefix.
|
|
/// @param hasREX_WPrefix - Indicates whether the instruction has a REX.W
|
|
/// prefix. If it does, 32-bit register operands stay
|
|
/// 32-bit regardless of the operand size.
|
|
/// @param hasOpSizePrefix Indicates whether the instruction has an OpSize
|
|
/// prefix. If it does not, then 16-bit register
|
|
/// operands stay 16-bit.
|
|
/// @return - The operand's type.
|
|
static OperandType typeFromString(const std::string& s,
|
|
bool isSSE,
|
|
bool hasREX_WPrefix,
|
|
bool hasOpSizePrefix);
|
|
|
|
/// immediateEncodingFromString - Translates an immediate encoding from the
|
|
/// string provided in the LLVM tables to an OperandEncoding for use in
|
|
/// the operand specifier.
|
|
///
|
|
/// @param s - See typeFromString().
|
|
/// @param hasOpSizePrefix - Indicates whether the instruction has an OpSize
|
|
/// prefix. If it does not, then 16-bit immediate
|
|
/// operands stay 16-bit.
|
|
/// @return - The operand's encoding.
|
|
static OperandEncoding immediateEncodingFromString(const std::string &s,
|
|
bool hasOpSizePrefix);
|
|
|
|
/// rmRegisterEncodingFromString - Like immediateEncodingFromString, but
|
|
/// handles operands that are in the REG field of the ModR/M byte.
|
|
static OperandEncoding rmRegisterEncodingFromString(const std::string &s,
|
|
bool hasOpSizePrefix);
|
|
|
|
/// rmRegisterEncodingFromString - Like immediateEncodingFromString, but
|
|
/// handles operands that are in the REG field of the ModR/M byte.
|
|
static OperandEncoding roRegisterEncodingFromString(const std::string &s,
|
|
bool hasOpSizePrefix);
|
|
static OperandEncoding memoryEncodingFromString(const std::string &s,
|
|
bool hasOpSizePrefix);
|
|
static OperandEncoding relocationEncodingFromString(const std::string &s,
|
|
bool hasOpSizePrefix);
|
|
static OperandEncoding opcodeModifierEncodingFromString(const std::string &s,
|
|
bool hasOpSizePrefix);
|
|
static OperandEncoding vvvvRegisterEncodingFromString(const std::string &s,
|
|
bool HasOpSizePrefix);
|
|
static OperandEncoding writemaskRegisterEncodingFromString(const std::string &s,
|
|
bool HasOpSizePrefix);
|
|
|
|
/// handleOperand - Converts a single operand from the LLVM table format to
|
|
/// the emitted table format, handling any duplicate operands it encounters
|
|
/// and then one non-duplicate.
|
|
///
|
|
/// @param optional - Determines whether to assert that the
|
|
/// operand exists.
|
|
/// @param operandIndex - The index into the generated operand table.
|
|
/// Incremented by this function one or more
|
|
/// times to reflect possible duplicate
|
|
/// operands).
|
|
/// @param physicalOperandIndex - The index of the current operand into the
|
|
/// set of non-duplicate ('physical') operands.
|
|
/// Incremented by this function once.
|
|
/// @param numPhysicalOperands - The number of non-duplicate operands in the
|
|
/// instructions.
|
|
/// @param operandMapping - The operand mapping, which has an entry for
|
|
/// each operand that indicates whether it is a
|
|
/// duplicate, and of what.
|
|
void handleOperand(bool optional,
|
|
unsigned &operandIndex,
|
|
unsigned &physicalOperandIndex,
|
|
unsigned &numPhysicalOperands,
|
|
const unsigned *operandMapping,
|
|
OperandEncoding (*encodingFromString)
|
|
(const std::string&,
|
|
bool hasOpSizePrefix));
|
|
|
|
/// shouldBeEmitted - Returns the shouldBeEmitted field. Although filter()
|
|
/// filters out many instructions, at various points in decoding we
|
|
/// determine that the instruction should not actually be decodable. In
|
|
/// particular, MMX MOV instructions aren't emitted, but they're only
|
|
/// identified during operand parsing.
|
|
///
|
|
/// @return - true if at this point we believe the instruction should be
|
|
/// emitted; false if not. This will return false if filter() returns false
|
|
/// once emitInstructionSpecifier() has been called.
|
|
bool shouldBeEmitted() const {
|
|
return ShouldBeEmitted;
|
|
}
|
|
|
|
/// emitInstructionSpecifier - Loads the instruction specifier for the current
|
|
/// instruction into a DisassemblerTables.
|
|
///
|
|
void emitInstructionSpecifier();
|
|
|
|
/// emitDecodePath - Populates the proper fields in the decode tables
|
|
/// corresponding to the decode paths for this instruction.
|
|
///
|
|
/// \param tables The DisassemblerTables to populate with the decode
|
|
/// decode information for the current instruction.
|
|
void emitDecodePath(DisassemblerTables &tables) const;
|
|
|
|
/// Constructor - Initializes a RecognizableInstr with the appropriate fields
|
|
/// from a CodeGenInstruction.
|
|
///
|
|
/// \param tables The DisassemblerTables that the specifier will be added to.
|
|
/// \param insn The CodeGenInstruction to extract information from.
|
|
/// \param uid The unique ID of the current instruction.
|
|
RecognizableInstr(DisassemblerTables &tables,
|
|
const CodeGenInstruction &insn,
|
|
InstrUID uid);
|
|
public:
|
|
/// processInstr - Accepts a CodeGenInstruction and loads decode information
|
|
/// for it into a DisassemblerTables if appropriate.
|
|
///
|
|
/// \param tables The DiassemblerTables to be populated with decode
|
|
/// information.
|
|
/// \param insn The CodeGenInstruction to be used as a source for this
|
|
/// information.
|
|
/// \param uid The unique ID of the instruction.
|
|
static void processInstr(DisassemblerTables &tables,
|
|
const CodeGenInstruction &insn,
|
|
InstrUID uid);
|
|
};
|
|
|
|
} // namespace X86Disassembler
|
|
|
|
} // namespace llvm
|
|
|
|
#endif
|