1//===- X86DisassemblerShared.h - Emitter shared header ----------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef X86DISASSEMBLERSHARED_H
11#define X86DISASSEMBLERSHARED_H
12
13#include <string.h>
14#include <string>
15
16#include "../../lib/Target/X86/Disassembler/X86DisassemblerDecoderCommon.h"
17
18struct InstructionSpecifier {
19  llvm::X86Disassembler::OperandSpecifier
20      operands[llvm::X86Disassembler::X86_MAX_OPERANDS];
21  llvm::X86Disassembler::InstructionContext insnContext;
22  std::string name;
23
24  InstructionSpecifier() {
25    insnContext = llvm::X86Disassembler::IC;
26    name = "";
27    memset(operands, 0, sizeof(operands));
28  }
29};
30
31/// Specifies whether a ModR/M byte is needed and (if so) which
32/// instruction each possible value of the ModR/M byte corresponds to. Once
33/// this information is known, we have narrowed down to a single instruction.
34struct ModRMDecision {
35  uint8_t modrm_type;
36  llvm::X86Disassembler::InstrUID instructionIDs[256];
37};
38
39/// Specifies which set of ModR/M->instruction tables to look at
40/// given a particular opcode.
41struct OpcodeDecision {
42  ModRMDecision modRMDecisions[256];
43};
44
45/// Specifies which opcode->instruction tables to look at given
46/// a particular context (set of attributes).  Since there are many possible
47/// contexts, the decoder first uses CONTEXTS_SYM to determine which context
48/// applies given a specific set of attributes.  Hence there are only IC_max
49/// entries in this table, rather than 2^(ATTR_max).
50struct ContextDecision {
51  OpcodeDecision opcodeDecisions[llvm::X86Disassembler::IC_max];
52};
53
54#endif
55