1 //===-- EDInst.h - LLVM Enhanced Disassembler -------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the interface for the Enhanced Disassembly library's
11 // instruction class. The instruction is responsible for vending the string
12 // representation, individual tokens and operands for a single instruction.
14 //===----------------------------------------------------------------------===//
19 #include "llvm/ADT/SmallVector.h"
27 struct EDDisassembler;
31 typedef int (^EDTokenVisitor_t)(EDToken *token);
34 /// CachedResult - Encapsulates the result of a function along with the validity
35 /// of that result, so that slow functions don't need to run twice
37 /// True if the result has been obtained by executing the function
39 /// The result last obtained from the function
42 /// Constructor - Initializes an invalid result
43 CachedResult() : Valid(false) { }
44 /// valid - Returns true if the result has been obtained by executing the
45 /// function and false otherwise
46 bool valid() { return Valid; }
47 /// result - Returns the result of the function or an undefined value if
49 int result() { return Result; }
50 /// setResult - Sets the result of the function and declares it valid
51 /// returning the result (so that setResult() can be called from inside a
53 /// @arg result - The result of the function
54 int setResult(int result) { Result = result; Valid = true; return result; }
57 /// EDInst - Encapsulates a single instruction, which can be queried for its
58 /// string representation, as well as its operands and tokens
60 /// The parent disassembler
61 EDDisassembler &Disassembler;
62 /// The containing MCInst
64 /// The instruction information provided by TableGen for this instruction
65 const llvm::EDInstInfo *ThisInstInfo;
66 /// The number of bytes for the machine code representation of the instruction
69 /// The result of the stringify() function
70 CachedResult StringifyResult;
71 /// The string representation of the instruction
73 /// The order in which operands from the InstInfo's operand information appear
75 const char* OperandOrder;
77 /// The result of the parseOperands() function
78 CachedResult ParseResult;
79 typedef llvm::SmallVector<EDOperand*, 5> opvec_t;
80 /// The instruction's operands
82 /// The operand corresponding to the target, if the instruction is a branch
84 /// The operand corresponding to the source, if the instruction is a move
86 /// The operand corresponding to the target, if the instruction is a move
89 /// The result of the tokenize() function
90 CachedResult TokenizeResult;
91 typedef std::vector<EDToken*> tokvec_t;
92 /// The instruction's tokens
95 /// Constructor - initializes an instruction given the output of the LLVM
98 /// @arg inst - The MCInst, which will now be owned by this object
99 /// @arg byteSize - The size of the consumed instruction, in bytes
100 /// @arg disassembler - The parent disassembler
101 /// @arg instInfo - The instruction information produced by the table
102 /// generator for this instruction
103 EDInst(llvm::MCInst *inst,
105 EDDisassembler &disassembler,
106 const llvm::EDInstInfo *instInfo);
109 /// byteSize - returns the number of bytes consumed by the machine code
110 /// representation of the instruction
112 /// instID - returns the LLVM instruction ID of the instruction
115 /// stringify - populates the String and AsmString members of the instruction,
116 /// returning 0 on success or -1 otherwise
118 /// getString - retrieves a pointer to the string representation of the
119 /// instructinon, returning 0 on success or -1 otherwise
121 /// @arg str - A reference to a pointer that, on success, is set to point to
122 /// the string representation of the instruction; this string is still owned
123 /// by the instruction and will be deleted when it is
124 int getString(const char *&str);
126 /// isBranch - Returns true if the instruction is a branch
128 /// isMove - Returns true if the instruction is a move
131 /// parseOperands - populates the Operands member of the instruction,
132 /// returning 0 on success or -1 otherwise
134 /// branchTargetID - returns the ID (suitable for use with getOperand()) of
135 /// the target operand if the instruction is a branch, or -1 otherwise
136 int branchTargetID();
137 /// moveSourceID - returns the ID of the source operand if the instruction
138 /// is a move, or -1 otherwise
140 /// moveTargetID - returns the ID of the target operand if the instruction
141 /// is a move, or -1 otherwise
144 /// numOperands - returns the number of operands available to retrieve, or -1
147 /// getOperand - retrieves an operand from the instruction's operand list by
148 /// index, returning 0 on success or -1 on error
150 /// @arg operand - A reference whose target is pointed at the operand on
151 /// success, although the operand is still owned by the EDInst
152 /// @arg index - The index of the operand in the instruction
153 int getOperand(EDOperand *&operand, unsigned int index);
155 /// tokenize - populates the Tokens member of the instruction, returning 0 on
156 /// success or -1 otherwise
158 /// numTokens - returns the number of tokens in the instruction, or -1 on
161 /// getToken - retrieves a token from the instruction's token list by index,
162 /// returning 0 on success or -1 on error
164 /// @arg token - A reference whose target is pointed at the token on success,
165 /// although the token is still owned by the EDInst
166 /// @arg index - The index of the token in the instrcutino
167 int getToken(EDToken *&token, unsigned int index);
170 /// visitTokens - Visits each token in turn and applies a block to it,
171 /// returning 0 if all blocks are visited and/or the block signals
172 /// termination by returning 1; returns -1 on error
174 /// @arg visitor - The visitor block to apply to all tokens.
175 int visitTokens(EDTokenVisitor_t visitor);
179 } // end namespace llvm