Table-driven disassembler for the X86 architecture (16-, 32-, and 64-bit
incarnations), integrated into the MC framework.
The disassembler is table-driven, using a custom TableGen backend to
generate hierarchical tables optimized for fast decode. The disassembler
consumes MemoryObjects and produces arrays of MCInsts, adhering to the
abstract base class MCDisassembler (llvm/MC/MCDisassembler.h).
The disassembler is documented in detail in
- lib/Target/X86/Disassembler/X86Disassembler.cpp (disassembler runtime)
- utils/TableGen/DisassemblerEmitter.cpp (table emitter)
You can test the disassembler by running llvm-mc -disassemble for i386
or x86_64 targets. Please let me know if you encounter any problems
with it.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91749 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/X86RecognizableInstr.cpp b/utils/TableGen/X86RecognizableInstr.cpp
new file mode 100644
index 0000000..8a21399
--- /dev/null
+++ b/utils/TableGen/X86RecognizableInstr.cpp
@@ -0,0 +1,959 @@
+//===- X86RecognizableInstr.cpp - 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 implementation of a single recognizable instruction.
+// Documentation for the disassembler emitter in general can be found in
+// X86DisasemblerEmitter.h.
+//
+//===----------------------------------------------------------------------===//
+
+#include "X86DisassemblerShared.h"
+#include "X86RecognizableInstr.h"
+#include "X86ModRMFilters.h"
+
+#include "llvm/Support/ErrorHandling.h"
+
+#include <string>
+
+using namespace llvm;
+
+// A clone of X86 since we can't depend on something that is generated.
+namespace X86Local {
+ enum {
+ Pseudo = 0,
+ RawFrm = 1,
+ AddRegFrm = 2,
+ MRMDestReg = 3,
+ MRMDestMem = 4,
+ MRMSrcReg = 5,
+ MRMSrcMem = 6,
+ MRM0r = 16, MRM1r = 17, MRM2r = 18, MRM3r = 19,
+ MRM4r = 20, MRM5r = 21, MRM6r = 22, MRM7r = 23,
+ MRM0m = 24, MRM1m = 25, MRM2m = 26, MRM3m = 27,
+ MRM4m = 28, MRM5m = 29, MRM6m = 30, MRM7m = 31,
+ MRMInitReg = 32
+ };
+
+ enum {
+ TB = 1,
+ REP = 2,
+ D8 = 3, D9 = 4, DA = 5, DB = 6,
+ DC = 7, DD = 8, DE = 9, DF = 10,
+ XD = 11, XS = 12,
+ T8 = 13, TA = 14
+ };
+}
+
+#define ONE_BYTE_EXTENSION_TABLES \
+ EXTENSION_TABLE(80) \
+ EXTENSION_TABLE(81) \
+ EXTENSION_TABLE(82) \
+ EXTENSION_TABLE(83) \
+ EXTENSION_TABLE(8f) \
+ EXTENSION_TABLE(c0) \
+ EXTENSION_TABLE(c1) \
+ EXTENSION_TABLE(c6) \
+ EXTENSION_TABLE(c7) \
+ EXTENSION_TABLE(d0) \
+ EXTENSION_TABLE(d1) \
+ EXTENSION_TABLE(d2) \
+ EXTENSION_TABLE(d3) \
+ EXTENSION_TABLE(f6) \
+ EXTENSION_TABLE(f7) \
+ EXTENSION_TABLE(fe) \
+ EXTENSION_TABLE(ff)
+
+#define TWO_BYTE_EXTENSION_TABLES \
+ EXTENSION_TABLE(00) \
+ EXTENSION_TABLE(01) \
+ EXTENSION_TABLE(18) \
+ EXTENSION_TABLE(71) \
+ EXTENSION_TABLE(72) \
+ EXTENSION_TABLE(73) \
+ EXTENSION_TABLE(ae) \
+ EXTENSION_TABLE(b9) \
+ EXTENSION_TABLE(ba) \
+ EXTENSION_TABLE(c7)
+
+#define TWO_BYTE_FULL_EXTENSION_TABLES \
+ EXTENSION_TABLE(01)
+
+
+using namespace X86Disassembler;
+
+/// needsModRMForDecode - Indicates whether a particular instruction requires a
+/// ModR/M byte for the instruction to be properly decoded. For example, a
+/// MRMDestReg instruction needs the Mod field in the ModR/M byte to be set to
+/// 0b11.
+///
+/// @param form - The form of the instruction.
+/// @return - true if the form implies that a ModR/M byte is required, false
+/// otherwise.
+static bool needsModRMForDecode(uint8_t form) {
+ if (form == X86Local::MRMDestReg ||
+ form == X86Local::MRMDestMem ||
+ form == X86Local::MRMSrcReg ||
+ form == X86Local::MRMSrcMem ||
+ (form >= X86Local::MRM0r && form <= X86Local::MRM7r) ||
+ (form >= X86Local::MRM0m && form <= X86Local::MRM7m))
+ return true;
+ else
+ return false;
+}
+
+/// isRegFormat - Indicates whether a particular form requires the Mod field of
+/// the ModR/M byte to be 0b11.
+///
+/// @param form - The form of the instruction.
+/// @return - true if the form implies that Mod must be 0b11, false
+/// otherwise.
+static bool isRegFormat(uint8_t form) {
+ if (form == X86Local::MRMDestReg ||
+ form == X86Local::MRMSrcReg ||
+ (form >= X86Local::MRM0r && form <= X86Local::MRM7r))
+ return true;
+ else
+ return false;
+}
+
+/// byteFromBitsInit - Extracts a value at most 8 bits in width from a BitsInit.
+/// Useful for switch statements and the like.
+///
+/// @param init - A reference to the BitsInit to be decoded.
+/// @return - The field, with the first bit in the BitsInit as the lowest
+/// order bit.
+static uint8_t byteFromBitsInit(BitsInit &init) {
+ int width = init.getNumBits();
+
+ assert(width <= 8 && "Field is too large for uint8_t!");
+
+ int index;
+ uint8_t mask = 0x01;
+
+ uint8_t ret = 0;
+
+ for (index = 0; index < width; index++) {
+ if (static_cast<BitInit*>(init.getBit(index))->getValue())
+ ret |= mask;
+
+ mask <<= 1;
+ }
+
+ return ret;
+}
+
+/// byteFromRec - Extract a value at most 8 bits in with from a Record given the
+/// name of the field.
+///
+/// @param rec - The record from which to extract the value.
+/// @param name - The name of the field in the record.
+/// @return - The field, as translated by byteFromBitsInit().
+static uint8_t byteFromRec(const Record* rec, const std::string &name) {
+ BitsInit* bits = rec->getValueAsBitsInit(name);
+ return byteFromBitsInit(*bits);
+}
+
+RecognizableInstr::RecognizableInstr(DisassemblerTables &tables,
+ const CodeGenInstruction &insn,
+ InstrUID uid) {
+ UID = uid;
+
+ Rec = insn.TheDef;
+ Name = Rec->getName();
+ Spec = &tables.specForUID(UID);
+
+ if (!Rec->isSubClassOf("X86Inst")) {
+ ShouldBeEmitted = false;
+ return;
+ }
+
+ Prefix = byteFromRec(Rec, "Prefix");
+ Opcode = byteFromRec(Rec, "Opcode");
+ Form = byteFromRec(Rec, "FormBits");
+ SegOvr = byteFromRec(Rec, "SegOvrBits");
+
+ HasOpSizePrefix = Rec->getValueAsBit("hasOpSizePrefix");
+ HasREX_WPrefix = Rec->getValueAsBit("hasREX_WPrefix");
+ HasLockPrefix = Rec->getValueAsBit("hasLockPrefix");
+ IsCodeGenOnly = Rec->getValueAsBit("isCodeGenOnly");
+
+ Name = Rec->getName();
+ AsmString = Rec->getValueAsString("AsmString");
+
+ Operands = &insn.OperandList;
+
+ IsSSE = HasOpSizePrefix && (Name.find("16") == Name.npos);
+ HasFROperands = false;
+
+ ShouldBeEmitted = true;
+}
+
+void RecognizableInstr::processInstr(DisassemblerTables &tables,
+ const CodeGenInstruction &insn,
+ InstrUID uid)
+{
+ RecognizableInstr recogInstr(tables, insn, uid);
+
+ recogInstr.emitInstructionSpecifier(tables);
+
+ if (recogInstr.shouldBeEmitted())
+ recogInstr.emitDecodePath(tables);
+}
+
+InstructionContext RecognizableInstr::insnContext() const {
+ InstructionContext insnContext;
+
+ if (Name.find("64") != Name.npos || HasREX_WPrefix) {
+ if (HasREX_WPrefix && HasOpSizePrefix)
+ insnContext = IC_64BIT_REXW_OPSIZE;
+ else if (HasOpSizePrefix)
+ insnContext = IC_64BIT_OPSIZE;
+ else if (HasREX_WPrefix && Prefix == X86Local::XS)
+ insnContext = IC_64BIT_REXW_XS;
+ else if (HasREX_WPrefix && Prefix == X86Local::XD)
+ insnContext = IC_64BIT_REXW_XD;
+ else if (Prefix == X86Local::XD)
+ insnContext = IC_64BIT_XD;
+ else if (Prefix == X86Local::XS)
+ insnContext = IC_64BIT_XS;
+ else if (HasREX_WPrefix)
+ insnContext = IC_64BIT_REXW;
+ else
+ insnContext = IC_64BIT;
+ } else {
+ if (HasOpSizePrefix)
+ insnContext = IC_OPSIZE;
+ else if (Prefix == X86Local::XD)
+ insnContext = IC_XD;
+ else if (Prefix == X86Local::XS)
+ insnContext = IC_XS;
+ else
+ insnContext = IC;
+ }
+
+ return insnContext;
+}
+
+RecognizableInstr::filter_ret RecognizableInstr::filter() const {
+ // Filter out intrinsics
+
+ if (!Rec->isSubClassOf("X86Inst"))
+ return FILTER_STRONG;
+
+ if (Form == X86Local::Pseudo ||
+ IsCodeGenOnly)
+ return FILTER_STRONG;
+
+ // Filter out instructions with a LOCK prefix;
+ // prefer forms that do not have the prefix
+ if (HasLockPrefix)
+ return FILTER_WEAK;
+
+ // Filter out artificial instructions
+
+ if (Name.find("TAILJMP") != Name.npos ||
+ Name.find("_Int") != Name.npos ||
+ Name.find("_int") != Name.npos ||
+ Name.find("Int_") != Name.npos ||
+ Name.find("_NOREX") != Name.npos ||
+ Name.find("EH_RETURN") != Name.npos ||
+ Name.find("V_SET") != Name.npos ||
+ Name.find("LOCK_") != Name.npos ||
+ Name.find("WIN") != Name.npos)
+ return FILTER_STRONG;
+
+ // Special cases.
+
+ if (Name.find("PCMPISTRI") != Name.npos && Name != "PCMPISTRI")
+ return FILTER_WEAK;
+ if (Name.find("PCMPESTRI") != Name.npos && Name != "PCMPESTRI")
+ return FILTER_WEAK;
+
+ if (Name.find("MOV") != Name.npos && Name.find("r0") != Name.npos)
+ return FILTER_WEAK;
+ if (Name.find("MOVZ") != Name.npos && Name.find("MOVZX") == Name.npos)
+ return FILTER_WEAK;
+ if (Name.find("Fs") != Name.npos)
+ return FILTER_WEAK;
+ if (Name == "MOVLPDrr" ||
+ Name == "MOVLPSrr" ||
+ Name == "PUSHFQ" ||
+ Name == "BSF16rr" ||
+ Name == "BSF16rm" ||
+ Name == "BSR16rr" ||
+ Name == "BSR16rm" ||
+ Name == "MOVSX16rm8" ||
+ Name == "MOVSX16rr8" ||
+ Name == "MOVZX16rm8" ||
+ Name == "MOVZX16rr8" ||
+ Name == "PUSH32i16" ||
+ Name == "PUSH64i16" ||
+ Name == "MOVPQI2QImr" ||
+ Name == "MOVSDmr" ||
+ Name == "MOVSDrm" ||
+ Name == "MOVSSmr" ||
+ Name == "MOVSSrm" ||
+ Name == "MMX_MOVD64rrv164" ||
+ Name == "CRC32m16" ||
+ Name == "MOV64ri64i32" ||
+ Name == "CRC32r16")
+ return FILTER_WEAK;
+
+ // Filter out instructions with segment override prefixes.
+ // They're too messy to handle now and we'll special case them if needed.
+
+ if (SegOvr)
+ return FILTER_STRONG;
+
+ // Filter out instructions that can't be printed.
+
+ if (AsmString.size() == 0)
+ return FILTER_STRONG;
+
+ // Filter out instructions with subreg operands.
+
+ if (AsmString.find("subreg") != AsmString.npos)
+ return FILTER_STRONG;
+
+ assert(Form != X86Local::MRMInitReg &&
+ "FORMAT_MRMINITREG instruction not skipped");
+
+ if (HasFROperands && Name.find("MOV") != Name.npos &&
+ ((Name.find("2") != Name.npos && Name.find("32") == Name.npos) ||
+ (Name.find("to") != Name.npos)))
+ return FILTER_WEAK;
+
+ return FILTER_NORMAL;
+}
+
+void RecognizableInstr::handleOperand(
+ bool optional,
+ unsigned &operandIndex,
+ unsigned &physicalOperandIndex,
+ unsigned &numPhysicalOperands,
+ unsigned *operandMapping,
+ OperandEncoding (*encodingFromString)(const std::string&, bool hasOpSizePrefix)) {
+ if (optional) {
+ if (physicalOperandIndex >= numPhysicalOperands)
+ return;
+ } else {
+ assert(physicalOperandIndex < numPhysicalOperands);
+ }
+
+ while (operandMapping[operandIndex] != operandIndex) {
+ Spec->operands[operandIndex].encoding = ENCODING_DUP;
+ Spec->operands[operandIndex].type =
+ (OperandType)(TYPE_DUP0 + operandMapping[operandIndex]);
+ ++operandIndex;
+ }
+
+ const std::string &typeName = (*Operands)[operandIndex].Rec->getName();
+
+ Spec->operands[operandIndex].encoding = encodingFromString(typeName,
+ HasOpSizePrefix);
+ Spec->operands[operandIndex].type = typeFromString(typeName,
+ IsSSE,
+ HasREX_WPrefix,
+ HasOpSizePrefix);
+
+ ++operandIndex;
+ ++physicalOperandIndex;
+}
+
+void RecognizableInstr::emitInstructionSpecifier(DisassemblerTables &tables) {
+ Spec->name = Name;
+
+ if (!Rec->isSubClassOf("X86Inst"))
+ return;
+
+ switch (filter()) {
+ case FILTER_WEAK:
+ Spec->filtered = true;
+ break;
+ case FILTER_STRONG:
+ ShouldBeEmitted = false;
+ return;
+ case FILTER_NORMAL:
+ break;
+ }
+
+ Spec->insnContext = insnContext();
+
+ const std::vector<CodeGenInstruction::OperandInfo> &OperandList = *Operands;
+
+ unsigned operandIndex;
+ unsigned numOperands = OperandList.size();
+ unsigned numPhysicalOperands = 0;
+
+ // operandMapping maps from operands in OperandList to their originals.
+ // If operandMapping[i] != i, then the entry is a duplicate.
+ unsigned operandMapping[X86_MAX_OPERANDS];
+
+ bool hasFROperands = false;
+
+ assert(numOperands < X86_MAX_OPERANDS && "X86_MAX_OPERANDS is not large enough");
+
+ for (operandIndex = 0; operandIndex < numOperands; ++operandIndex) {
+ if (OperandList[operandIndex].Constraints.size()) {
+ const std::string &constraint = OperandList[operandIndex].Constraints[0];
+ std::string::size_type tiedToPos;
+
+ if ((tiedToPos = constraint.find(" << 16) | (1 << TOI::TIED_TO))")) !=
+ constraint.npos) {
+ tiedToPos--;
+ operandMapping[operandIndex] = constraint[tiedToPos] - '0';
+ } else {
+ ++numPhysicalOperands;
+ operandMapping[operandIndex] = operandIndex;
+ }
+ } else {
+ ++numPhysicalOperands;
+ operandMapping[operandIndex] = operandIndex;
+ }
+
+ const std::string &recName = OperandList[operandIndex].Rec->getName();
+
+ if (recName.find("FR") != recName.npos)
+ hasFROperands = true;
+ }
+
+ if (hasFROperands && Name.find("MOV") != Name.npos &&
+ ((Name.find("2") != Name.npos && Name.find("32") == Name.npos) ||
+ (Name.find("to") != Name.npos)))
+ ShouldBeEmitted = false;
+
+ if (!ShouldBeEmitted)
+ return;
+
+#define HANDLE_OPERAND(class) \
+ handleOperand(false, \
+ operandIndex, \
+ physicalOperandIndex, \
+ numPhysicalOperands, \
+ operandMapping, \
+ class##EncodingFromString);
+
+#define HANDLE_OPTIONAL(class) \
+ handleOperand(true, \
+ operandIndex, \
+ physicalOperandIndex, \
+ numPhysicalOperands, \
+ operandMapping, \
+ class##EncodingFromString);
+
+ // operandIndex should always be < numOperands
+ operandIndex = 0;
+ // physicalOperandIndex should always be < numPhysicalOperands
+ unsigned physicalOperandIndex = 0;
+
+ switch (Form) {
+ case X86Local::RawFrm:
+ // Operand 1 (optional) is an address or immediate.
+ // Operand 2 (optional) is an immediate.
+ assert(numPhysicalOperands <= 2 &&
+ "Unexpected number of operands for RawFrm");
+ HANDLE_OPTIONAL(relocation)
+ HANDLE_OPTIONAL(immediate)
+ break;
+ case X86Local::AddRegFrm:
+ // Operand 1 is added to the opcode.
+ // Operand 2 (optional) is an address.
+ assert(numPhysicalOperands >= 1 && numPhysicalOperands <= 2 &&
+ "Unexpected number of operands for AddRegFrm");
+ HANDLE_OPERAND(opcodeModifier)
+ HANDLE_OPTIONAL(relocation)
+ break;
+ case X86Local::MRMDestReg:
+ // Operand 1 is a register operand in the R/M field.
+ // Operand 2 is a register operand in the Reg/Opcode field.
+ // Operand 3 (optional) is an immediate.
+ assert(numPhysicalOperands >= 2 && numPhysicalOperands <= 3 &&
+ "Unexpected number of operands for MRMDestRegFrm");
+ HANDLE_OPERAND(rmRegister)
+ HANDLE_OPERAND(roRegister)
+ HANDLE_OPTIONAL(immediate)
+ break;
+ case X86Local::MRMDestMem:
+ // Operand 1 is a memory operand (possibly SIB-extended)
+ // Operand 2 is a register operand in the Reg/Opcode field.
+ // Operand 3 (optional) is an immediate.
+ assert(numPhysicalOperands >= 2 && numPhysicalOperands <= 3 &&
+ "Unexpected number of operands for MRMDestMemFrm");
+ HANDLE_OPERAND(memory)
+ HANDLE_OPERAND(roRegister)
+ HANDLE_OPTIONAL(immediate)
+ break;
+ case X86Local::MRMSrcReg:
+ // Operand 1 is a register operand in the Reg/Opcode field.
+ // Operand 2 is a register operand in the R/M field.
+ // Operand 3 (optional) is an immediate.
+ assert(numPhysicalOperands >= 2 && numPhysicalOperands <= 3 &&
+ "Unexpected number of operands for MRMSrcRegFrm");
+ HANDLE_OPERAND(roRegister)
+ HANDLE_OPERAND(rmRegister)
+ HANDLE_OPTIONAL(immediate)
+ break;
+ case X86Local::MRMSrcMem:
+ // Operand 1 is a register operand in the Reg/Opcode field.
+ // Operand 2 is a memory operand (possibly SIB-extended)
+ // Operand 3 (optional) is an immediate.
+ assert(numPhysicalOperands >= 2 && numPhysicalOperands <= 3 &&
+ "Unexpected number of operands for MRMSrcMemFrm");
+ HANDLE_OPERAND(roRegister)
+ HANDLE_OPERAND(memory)
+ HANDLE_OPTIONAL(immediate)
+ break;
+ case X86Local::MRM0r:
+ case X86Local::MRM1r:
+ case X86Local::MRM2r:
+ case X86Local::MRM3r:
+ case X86Local::MRM4r:
+ case X86Local::MRM5r:
+ case X86Local::MRM6r:
+ case X86Local::MRM7r:
+ // Operand 1 is a register operand in the R/M field.
+ // Operand 2 (optional) is an immediate or relocation.
+ assert(numPhysicalOperands <= 2 &&
+ "Unexpected number of operands for MRMnRFrm");
+ HANDLE_OPTIONAL(rmRegister)
+ HANDLE_OPTIONAL(relocation)
+ break;
+ case X86Local::MRM0m:
+ case X86Local::MRM1m:
+ case X86Local::MRM2m:
+ case X86Local::MRM3m:
+ case X86Local::MRM4m:
+ case X86Local::MRM5m:
+ case X86Local::MRM6m:
+ case X86Local::MRM7m:
+ // Operand 1 is a memory operand (possibly SIB-extended)
+ // Operand 2 (optional) is an immediate or relocation.
+ assert(numPhysicalOperands >= 1 && numPhysicalOperands <= 2 &&
+ "Unexpected number of operands for MRMnMFrm");
+ HANDLE_OPERAND(memory)
+ HANDLE_OPTIONAL(relocation)
+ break;
+ case X86Local::MRMInitReg:
+ // Ignored.
+ break;
+ }
+
+ #undef HANDLE_OPERAND
+ #undef HANDLE_OPTIONAL
+}
+
+void RecognizableInstr::emitDecodePath(DisassemblerTables &tables) const {
+ // Special cases where the LLVM tables are not complete
+
+#define EXACTCASE(class, name, lastbyte) \
+ if (Name == name) { \
+ tables.setTableFields(class, \
+ insnContext(), \
+ Opcode, \
+ ExactFilter(lastbyte), \
+ UID); \
+ Spec->modifierBase = Opcode; \
+ return; \
+ }
+
+ EXACTCASE(TWOBYTE, "MONITOR", 0xc8)
+ EXACTCASE(TWOBYTE, "MWAIT", 0xc9)
+ EXACTCASE(TWOBYTE, "SWPGS", 0xf8)
+ EXACTCASE(TWOBYTE, "INVEPT", 0x80)
+ EXACTCASE(TWOBYTE, "INVVPID", 0x81)
+ EXACTCASE(TWOBYTE, "VMCALL", 0xc1)
+ EXACTCASE(TWOBYTE, "VMLAUNCH", 0xc2)
+ EXACTCASE(TWOBYTE, "VMRESUME", 0xc3)
+ EXACTCASE(TWOBYTE, "VMXOFF", 0xc4)
+
+ if (Name == "INVLPG") {
+ tables.setTableFields(TWOBYTE,
+ insnContext(),
+ Opcode,
+ ExtendedFilter(false, 7),
+ UID);
+ Spec->modifierBase = Opcode;
+ return;
+ }
+
+ OpcodeType opcodeType = (OpcodeType)-1;
+
+ ModRMFilter* filter = NULL;
+ uint8_t opcodeToSet = 0;
+
+ switch (Prefix) {
+ // Extended two-byte opcodes can start with f2 0f, f3 0f, or 0f
+ case X86Local::XD:
+ case X86Local::XS:
+ case X86Local::TB:
+ opcodeType = TWOBYTE;
+
+ switch (Opcode) {
+#define EXTENSION_TABLE(n) case 0x##n:
+ TWO_BYTE_EXTENSION_TABLES
+#undef EXTENSION_TABLE
+ switch (Form) {
+ default:
+ llvm_unreachable("Unhandled two-byte extended opcode");
+ case X86Local::MRM0r:
+ case X86Local::MRM1r:
+ case X86Local::MRM2r:
+ case X86Local::MRM3r:
+ case X86Local::MRM4r:
+ case X86Local::MRM5r:
+ case X86Local::MRM6r:
+ case X86Local::MRM7r:
+ filter = new ExtendedFilter(true, Form - X86Local::MRM0r);
+ break;
+ case X86Local::MRM0m:
+ case X86Local::MRM1m:
+ case X86Local::MRM2m:
+ case X86Local::MRM3m:
+ case X86Local::MRM4m:
+ case X86Local::MRM5m:
+ case X86Local::MRM6m:
+ case X86Local::MRM7m:
+ filter = new ExtendedFilter(false, Form - X86Local::MRM0m);
+ break;
+ } // switch (Form)
+ break;
+ default:
+ if (needsModRMForDecode(Form))
+ filter = new ModFilter(isRegFormat(Form));
+ else
+ filter = new DumbFilter();
+
+ break;
+ } // switch (opcode)
+ opcodeToSet = Opcode;
+ break;
+ case X86Local::T8:
+ opcodeType = THREEBYTE_38;
+ if (needsModRMForDecode(Form))
+ filter = new ModFilter(isRegFormat(Form));
+ else
+ filter = new DumbFilter();
+ opcodeToSet = Opcode;
+ break;
+ case X86Local::TA:
+ opcodeType = THREEBYTE_3A;
+ if (needsModRMForDecode(Form))
+ filter = new ModFilter(isRegFormat(Form));
+ else
+ filter = new DumbFilter();
+ opcodeToSet = Opcode;
+ break;
+ case X86Local::D8:
+ case X86Local::D9:
+ case X86Local::DA:
+ case X86Local::DB:
+ case X86Local::DC:
+ case X86Local::DD:
+ case X86Local::DE:
+ case X86Local::DF:
+ assert(Opcode >= 0xc0 && "Unexpected opcode for an escape opcode");
+ opcodeType = ONEBYTE;
+ if (Form == X86Local::AddRegFrm) {
+ Spec->modifierType = MODIFIER_MODRM;
+ Spec->modifierBase = Opcode;
+ filter = new AddRegEscapeFilter(Opcode);
+ } else {
+ filter = new EscapeFilter(true, Opcode);
+ }
+ opcodeToSet = 0xd8 + (Prefix - X86Local::D8);
+ break;
+ default:
+ opcodeType = ONEBYTE;
+ switch (Opcode) {
+#define EXTENSION_TABLE(n) case 0x##n:
+ ONE_BYTE_EXTENSION_TABLES
+#undef EXTENSION_TABLE
+ switch (Form) {
+ default:
+ llvm_unreachable("Fell through the cracks of a single-byte "
+ "extended opcode");
+ case X86Local::MRM0r:
+ case X86Local::MRM1r:
+ case X86Local::MRM2r:
+ case X86Local::MRM3r:
+ case X86Local::MRM4r:
+ case X86Local::MRM5r:
+ case X86Local::MRM6r:
+ case X86Local::MRM7r:
+ filter = new ExtendedFilter(true, Form - X86Local::MRM0r);
+ break;
+ case X86Local::MRM0m:
+ case X86Local::MRM1m:
+ case X86Local::MRM2m:
+ case X86Local::MRM3m:
+ case X86Local::MRM4m:
+ case X86Local::MRM5m:
+ case X86Local::MRM6m:
+ case X86Local::MRM7m:
+ filter = new ExtendedFilter(false, Form - X86Local::MRM0m);
+ break;
+ } // switch (Form)
+ break;
+ case 0xd8:
+ case 0xd9:
+ case 0xda:
+ case 0xdb:
+ case 0xdc:
+ case 0xdd:
+ case 0xde:
+ case 0xdf:
+ filter = new EscapeFilter(false, Form - X86Local::MRM0m);
+ break;
+ default:
+ if (needsModRMForDecode(Form))
+ filter = new ModFilter(isRegFormat(Form));
+ else
+ filter = new DumbFilter();
+ break;
+ } // switch (Opcode)
+ opcodeToSet = Opcode;
+ } // switch (Prefix)
+
+ assert(opcodeType != (OpcodeType)-1 &&
+ "Opcode type not set");
+ assert(filter && "Filter not set");
+
+ if (Form == X86Local::AddRegFrm) {
+ if(Spec->modifierType != MODIFIER_MODRM) {
+ assert(opcodeToSet < 0xf9 &&
+ "Not enough room for all ADDREG_FRM operands");
+
+ uint8_t currentOpcode;
+
+ for (currentOpcode = opcodeToSet;
+ currentOpcode < opcodeToSet + 8;
+ ++currentOpcode)
+ tables.setTableFields(opcodeType,
+ insnContext(),
+ currentOpcode,
+ *filter,
+ UID);
+
+ Spec->modifierType = MODIFIER_OPCODE;
+ Spec->modifierBase = opcodeToSet;
+ } else {
+ // modifierBase was set where MODIFIER_MODRM was set
+ tables.setTableFields(opcodeType,
+ insnContext(),
+ opcodeToSet,
+ *filter,
+ UID);
+ }
+ } else {
+ tables.setTableFields(opcodeType,
+ insnContext(),
+ opcodeToSet,
+ *filter,
+ UID);
+
+ Spec->modifierType = MODIFIER_NONE;
+ Spec->modifierBase = opcodeToSet;
+ }
+
+ delete filter;
+}
+
+#define TYPE(str, type) if (s == str) return type;
+OperandType RecognizableInstr::typeFromString(const std::string &s,
+ bool isSSE,
+ bool hasREX_WPrefix,
+ bool hasOpSizePrefix) {
+ if (isSSE) {
+ // For SSE instructions, we ignore the OpSize prefix and force operand
+ // sizes.
+ TYPE("GR16", TYPE_R16)
+ TYPE("GR32", TYPE_R32)
+ TYPE("GR64", TYPE_R64)
+ }
+ if(hasREX_WPrefix) {
+ // For instructions with a REX_W prefix, a declared 32-bit register encoding
+ // is special.
+ TYPE("GR32", TYPE_R32)
+ }
+ if(!hasOpSizePrefix) {
+ // For instructions without an OpSize prefix, a declared 16-bit register or
+ // immediate encoding is special.
+ TYPE("GR16", TYPE_R16)
+ TYPE("i16imm", TYPE_IMM16)
+ }
+ TYPE("i16mem", TYPE_Mv)
+ TYPE("i16imm", TYPE_IMMv)
+ TYPE("i16i8imm", TYPE_IMMv)
+ TYPE("GR16", TYPE_Rv)
+ TYPE("i32mem", TYPE_Mv)
+ TYPE("i32imm", TYPE_IMMv)
+ TYPE("i32i8imm", TYPE_IMM32)
+ TYPE("GR32", TYPE_Rv)
+ TYPE("i64mem", TYPE_Mv)
+ TYPE("i64i32imm", TYPE_IMM64)
+ TYPE("i64i8imm", TYPE_IMM64)
+ TYPE("GR64", TYPE_R64)
+ TYPE("i8mem", TYPE_M8)
+ TYPE("i8imm", TYPE_IMM8)
+ TYPE("GR8", TYPE_R8)
+ TYPE("VR128", TYPE_XMM128)
+ TYPE("f128mem", TYPE_M128)
+ TYPE("FR64", TYPE_XMM64)
+ TYPE("f64mem", TYPE_M64FP)
+ TYPE("FR32", TYPE_XMM32)
+ TYPE("f32mem", TYPE_M32FP)
+ TYPE("RST", TYPE_ST)
+ TYPE("i128mem", TYPE_M128)
+ TYPE("i64i32imm_pcrel", TYPE_REL64)
+ TYPE("i32imm_pcrel", TYPE_REL32)
+ TYPE("SSECC", TYPE_IMM8)
+ TYPE("brtarget", TYPE_RELv)
+ TYPE("brtarget8", TYPE_REL8)
+ TYPE("f80mem", TYPE_M80FP)
+ TYPE("lea32mem", TYPE_M32)
+ TYPE("lea64_32mem", TYPE_M64)
+ TYPE("lea64mem", TYPE_M64)
+ TYPE("VR64", TYPE_MM64)
+ TYPE("i64imm", TYPE_IMMv)
+ TYPE("opaque32mem", TYPE_M1616)
+ TYPE("opaque48mem", TYPE_M1632)
+ TYPE("opaque80mem", TYPE_M1664)
+ TYPE("opaque512mem", TYPE_M512)
+ TYPE("SEGMENT_REG", TYPE_SEGMENTREG)
+ TYPE("DEBUG_REG", TYPE_DEBUGREG)
+ TYPE("CONTROL_REG_32", TYPE_CR32)
+ TYPE("CONTROL_REG_64", TYPE_CR64)
+ TYPE("offset8", TYPE_MOFFS8)
+ TYPE("offset16", TYPE_MOFFS16)
+ TYPE("offset32", TYPE_MOFFS32)
+ TYPE("offset64", TYPE_MOFFS64)
+ errs() << "Unhandled type string " << s << "\n";
+ llvm_unreachable("Unhandled type string");
+}
+#undef TYPE
+
+#define ENCODING(str, encoding) if (s == str) return encoding;
+OperandEncoding RecognizableInstr::immediateEncodingFromString
+ (const std::string &s,
+ bool hasOpSizePrefix) {
+ if(!hasOpSizePrefix) {
+ // For instructions without an OpSize prefix, a declared 16-bit register or
+ // immediate encoding is special.
+ ENCODING("i16imm", ENCODING_IW)
+ }
+ ENCODING("i32i8imm", ENCODING_IB)
+ ENCODING("SSECC", ENCODING_IB)
+ ENCODING("i16imm", ENCODING_Iv)
+ ENCODING("i16i8imm", ENCODING_IB)
+ ENCODING("i32imm", ENCODING_Iv)
+ ENCODING("i64i32imm", ENCODING_ID)
+ ENCODING("i64i8imm", ENCODING_IB)
+ ENCODING("i8imm", ENCODING_IB)
+ errs() << "Unhandled immediate encoding " << s << "\n";
+ llvm_unreachable("Unhandled immediate encoding");
+}
+
+OperandEncoding RecognizableInstr::rmRegisterEncodingFromString
+ (const std::string &s,
+ bool hasOpSizePrefix) {
+ ENCODING("GR16", ENCODING_RM)
+ ENCODING("GR32", ENCODING_RM)
+ ENCODING("GR64", ENCODING_RM)
+ ENCODING("GR8", ENCODING_RM)
+ ENCODING("VR128", ENCODING_RM)
+ ENCODING("FR64", ENCODING_RM)
+ ENCODING("FR32", ENCODING_RM)
+ ENCODING("VR64", ENCODING_RM)
+ errs() << "Unhandled R/M register encoding " << s << "\n";
+ llvm_unreachable("Unhandled R/M register encoding");
+}
+
+OperandEncoding RecognizableInstr::roRegisterEncodingFromString
+ (const std::string &s,
+ bool hasOpSizePrefix) {
+ ENCODING("GR16", ENCODING_REG)
+ ENCODING("GR32", ENCODING_REG)
+ ENCODING("GR64", ENCODING_REG)
+ ENCODING("GR8", ENCODING_REG)
+ ENCODING("VR128", ENCODING_REG)
+ ENCODING("FR64", ENCODING_REG)
+ ENCODING("FR32", ENCODING_REG)
+ ENCODING("VR64", ENCODING_REG)
+ ENCODING("SEGMENT_REG", ENCODING_REG)
+ ENCODING("DEBUG_REG", ENCODING_REG)
+ ENCODING("CONTROL_REG_32", ENCODING_REG)
+ ENCODING("CONTROL_REG_64", ENCODING_REG)
+ errs() << "Unhandled reg/opcode register encoding " << s << "\n";
+ llvm_unreachable("Unhandled reg/opcode register encoding");
+}
+
+OperandEncoding RecognizableInstr::memoryEncodingFromString
+ (const std::string &s,
+ bool hasOpSizePrefix) {
+ ENCODING("i16mem", ENCODING_RM)
+ ENCODING("i32mem", ENCODING_RM)
+ ENCODING("i64mem", ENCODING_RM)
+ ENCODING("i8mem", ENCODING_RM)
+ ENCODING("f128mem", ENCODING_RM)
+ ENCODING("f64mem", ENCODING_RM)
+ ENCODING("f32mem", ENCODING_RM)
+ ENCODING("i128mem", ENCODING_RM)
+ ENCODING("f80mem", ENCODING_RM)
+ ENCODING("lea32mem", ENCODING_RM)
+ ENCODING("lea64_32mem", ENCODING_RM)
+ ENCODING("lea64mem", ENCODING_RM)
+ ENCODING("opaque32mem", ENCODING_RM)
+ ENCODING("opaque48mem", ENCODING_RM)
+ ENCODING("opaque80mem", ENCODING_RM)
+ ENCODING("opaque512mem", ENCODING_RM)
+ errs() << "Unhandled memory encoding " << s << "\n";
+ llvm_unreachable("Unhandled memory encoding");
+}
+
+OperandEncoding RecognizableInstr::relocationEncodingFromString
+ (const std::string &s,
+ bool hasOpSizePrefix) {
+ if(!hasOpSizePrefix) {
+ // For instructions without an OpSize prefix, a declared 16-bit register or
+ // immediate encoding is special.
+ ENCODING("i16imm", ENCODING_IW)
+ }
+ ENCODING("i16imm", ENCODING_Iv)
+ ENCODING("i16i8imm", ENCODING_IB)
+ ENCODING("i32imm", ENCODING_Iv)
+ ENCODING("i32i8imm", ENCODING_IB)
+ ENCODING("i64i32imm", ENCODING_ID)
+ ENCODING("i64i8imm", ENCODING_IB)
+ ENCODING("i8imm", ENCODING_IB)
+ ENCODING("i64i32imm_pcrel", ENCODING_ID)
+ ENCODING("i32imm_pcrel", ENCODING_ID)
+ ENCODING("brtarget", ENCODING_Iv)
+ ENCODING("brtarget8", ENCODING_IB)
+ ENCODING("i64imm", ENCODING_IO)
+ ENCODING("offset8", ENCODING_Ia)
+ ENCODING("offset16", ENCODING_Ia)
+ ENCODING("offset32", ENCODING_Ia)
+ ENCODING("offset64", ENCODING_Ia)
+ errs() << "Unhandled relocation encoding " << s << "\n";
+ llvm_unreachable("Unhandled relocation encoding");
+}
+
+OperandEncoding RecognizableInstr::opcodeModifierEncodingFromString
+ (const std::string &s,
+ bool hasOpSizePrefix) {
+ ENCODING("RST", ENCODING_I)
+ ENCODING("GR32", ENCODING_Rv)
+ ENCODING("GR64", ENCODING_RO)
+ ENCODING("GR16", ENCODING_Rv)
+ ENCODING("GR8", ENCODING_RB)
+ errs() << "Unhandled opcode modifier encoding " << s << "\n";
+ llvm_unreachable("Unhandled opcode modifier encoding");
+}
+#undef ENCODING
\ No newline at end of file