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llvm-mirror/utils/TableGen/X86RecognizableInstr.h
Craig Topper 7043d25ccf [X86] Add a new VEX_WPrefix encoding to tag EVEX instruction that have VEX.W==1, but can be converted to their VEX equivalent that uses VEX.W==0. 
EVEX makes heavy use of the VEX.W bit to indicate 64-bit element vs 32-bit elements. Many of the VEX instructions were split into 2 versions with different masking granularity.

The EVEX->VEX table generate can collapse the two versions if the VEX version uses is tagged as VEX_WIG. But if the VEX version is instead marked VEX.W==0 we can't combine them because we don't know if there is also a VEX version with VEX.W==1.

This patch adds a new VEX_W1X tag that indicates the EVEX instruction encodes with VEX.W==1, but is safe to convert to a VEX instruction with VEX.W==0.

This allows us to remove a bunch of manual EVEX->VEX table entries. We may want to look into splitting up the VEX_WPrefix field which would simplify the disassembler.

llvm-svn: 335017
2018-06-19 04:24:42 +00:00

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//===- 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
// X86DisassemblerEmitter.h.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_UTILS_TABLEGEN_X86RECOGNIZABLEINSTR_H
#define LLVM_UTILS_TABLEGEN_X86RECOGNIZABLEINSTR_H
#include "CodeGenTarget.h"
#include "X86DisassemblerTables.h"
#include "llvm/Support/DataTypes.h"
#include "llvm/TableGen/Record.h"
namespace llvm {
#define X86_INSTR_MRM_MAPPING \
MAP(C0, 64) \
MAP(C1, 65) \
MAP(C2, 66) \
MAP(C3, 67) \
MAP(C4, 68) \
MAP(C5, 69) \
MAP(C6, 70) \
MAP(C7, 71) \
MAP(C8, 72) \
MAP(C9, 73) \
MAP(CA, 74) \
MAP(CB, 75) \
MAP(CC, 76) \
MAP(CD, 77) \
MAP(CE, 78) \
MAP(CF, 79) \
MAP(D0, 80) \
MAP(D1, 81) \
MAP(D2, 82) \
MAP(D3, 83) \
MAP(D4, 84) \
MAP(D5, 85) \
MAP(D6, 86) \
MAP(D7, 87) \
MAP(D8, 88) \
MAP(D9, 89) \
MAP(DA, 90) \
MAP(DB, 91) \
MAP(DC, 92) \
MAP(DD, 93) \
MAP(DE, 94) \
MAP(DF, 95) \
MAP(E0, 96) \
MAP(E1, 97) \
MAP(E2, 98) \
MAP(E3, 99) \
MAP(E4, 100) \
MAP(E5, 101) \
MAP(E6, 102) \
MAP(E7, 103) \
MAP(E8, 104) \
MAP(E9, 105) \
MAP(EA, 106) \
MAP(EB, 107) \
MAP(EC, 108) \
MAP(ED, 109) \
MAP(EE, 110) \
MAP(EF, 111) \
MAP(F0, 112) \
MAP(F1, 113) \
MAP(F2, 114) \
MAP(F3, 115) \
MAP(F4, 116) \
MAP(F5, 117) \
MAP(F6, 118) \
MAP(F7, 119) \
MAP(F8, 120) \
MAP(F9, 121) \
MAP(FA, 122) \
MAP(FB, 123) \
MAP(FC, 124) \
MAP(FD, 125) \
MAP(FE, 126) \
MAP(FF, 127)
// A clone of X86 since we can't depend on something that is generated.
namespace X86Local {
enum {
Pseudo = 0,
RawFrm = 1,
AddRegFrm = 2,
RawFrmMemOffs = 3,
RawFrmSrc = 4,
RawFrmDst = 5,
RawFrmDstSrc = 6,
RawFrmImm8 = 7,
RawFrmImm16 = 8,
MRMDestMem = 32,
MRMSrcMem = 33,
MRMSrcMem4VOp3 = 34,
MRMSrcMemOp4 = 35,
MRMXm = 39,
MRM0m = 40, MRM1m = 41, MRM2m = 42, MRM3m = 43,
MRM4m = 44, MRM5m = 45, MRM6m = 46, MRM7m = 47,
MRMDestReg = 48,
MRMSrcReg = 49,
MRMSrcReg4VOp3 = 50,
MRMSrcRegOp4 = 51,
MRMXr = 55,
MRM0r = 56, MRM1r = 57, MRM2r = 58, MRM3r = 59,
MRM4r = 60, MRM5r = 61, MRM6r = 62, MRM7r = 63,
#define MAP(from, to) MRM_##from = to,
X86_INSTR_MRM_MAPPING
#undef MAP
};
enum {
OB = 0, TB = 1, T8 = 2, TA = 3, XOP8 = 4, XOP9 = 5, XOPA = 6, ThreeDNow = 7
};
enum {
PD = 1, XS = 2, XD = 3, PS = 4
};
enum {
VEX = 1, XOP = 2, EVEX = 3
};
enum {
OpSize16 = 1, OpSize32 = 2
};
enum {
AdSize16 = 1, AdSize32 = 2, AdSize64 = 3
};
enum {
VEX_W0 = 0, VEX_W1 = 1, VEX_WIG = 2, VEX_W1X = 3
};
}
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 OpPrefix field from the record
uint8_t OpPrefix;
/// The OpMap field from the record
uint8_t OpMap;
/// 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 encoding field from the record
uint8_t Encoding;
/// The OpSize field from the record
uint8_t OpSize;
/// The AdSize field from the record
uint8_t AdSize;
/// The hasREX_WPrefix field from the record
bool HasREX_WPrefix;
/// The hasVEX_4V field from the record
bool HasVEX_4V;
/// The VEX_WPrefix field from the record
uint8_t VEX_WPrefix;
/// Inferred from the operands; indicates whether the L bit in the VEX prefix is set
bool HasVEX_LPrefix;
/// The ignoreVEX_L field from the record
bool IgnoresVEX_L;
/// 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;
/// Indicates that the instruction uses the L and L' fields for RC.
bool EncodeRC;
/// The isCodeGenOnly field from the record
bool IsCodeGenOnly;
/// The ForceDisassemble field from the record
bool ForceDisassemble;
// The CD8_Scale field from the record
uint8_t CD8_Scale;
// 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;
/// 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;
/// 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 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 OpSize Indicates the operand size of the instruction.
/// If register size does not match OpSize, then
/// register sizes keep their size.
/// @return - The operand's type.
static OperandType typeFromString(const std::string& s,
bool hasREX_WPrefix, uint8_t OpSize);
/// 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 OpSize - Indicates whether this is an OpSize16 instruction.
/// If it is not, then 16-bit immediate operands stay 16-bit.
/// @return - The operand's encoding.
static OperandEncoding immediateEncodingFromString(const std::string &s,
uint8_t OpSize);
/// rmRegisterEncodingFromString - Like immediateEncodingFromString, but
/// handles operands that are in the REG field of the ModR/M byte.
static OperandEncoding rmRegisterEncodingFromString(const std::string &s,
uint8_t OpSize);
/// rmRegisterEncodingFromString - Like immediateEncodingFromString, but
/// handles operands that are in the REG field of the ModR/M byte.
static OperandEncoding roRegisterEncodingFromString(const std::string &s,
uint8_t OpSize);
static OperandEncoding memoryEncodingFromString(const std::string &s,
uint8_t OpSize);
static OperandEncoding relocationEncodingFromString(const std::string &s,
uint8_t OpSize);
static OperandEncoding opcodeModifierEncodingFromString(const std::string &s,
uint8_t OpSize);
static OperandEncoding vvvvRegisterEncodingFromString(const std::string &s,
uint8_t OpSize);
static OperandEncoding writemaskRegisterEncodingFromString(const std::string &s,
uint8_t OpSize);
/// Adjust the encoding type for an operand based on the instruction.
void adjustOperandEncoding(OperandEncoding &encoding);
/// 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&,
uint8_t OpSize));
/// 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
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