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// Copyright 2011 Google Inc. All Rights Reserved.
#ifndef ART_SRC_DEX_INSTRUCTION_H_
#define ART_SRC_DEX_INSTRUCTION_H_
#include "src/globals.h"
#include "src/logging.h"
#include "src/macros.h"
namespace art {
class Instruction {
public:
// NOP-encoded switch-statement signatures.
enum {
kPackedSwitchSignature = 0x0100,
kSparseSwitchSignature = 0x0200,
kArrayDataSignature = 0x0300
};
enum Code {
#define INSTRUCTION_ENUM(opcode, cname, p, f, r, i, a) cname = opcode,
#include "src/dex_instruction_list.h"
DEX_INSTRUCTION_LIST(INSTRUCTION_ENUM)
#undef DEX_INSTRUCTION_LIST
#undef INSTRUCTION_ENUM
};
enum InstructionFormat {
k10x, // op
k12x, // op vA, vB
k11n, // op vA, #+B
k11x, // op vAA
k10t, // op +AA
k20t, // op +AAAA
k22x, // op vAA, vBBBB
k21t, // op vAA, +BBBB
k21s, // op vAA, #+BBBB
k21h, // op vAA, #+BBBB00000[00000000]
k21c, // op vAA, thing@BBBB
k23x, // op vAA, vBB, vCC
k22b, // op vAA, vBB, #+CC
k22t, // op vA, vB, +CCCC
k22s, // op vA, vB, #+CCCC
k22c, // op vA, vB, thing@CCCC
k32x, // op vAAAA, vBBBB
k30t, // op +AAAAAAAA
k31t, // op vAA, +BBBBBBBB
k31i, // op vAA, #+BBBBBBBB
k31c, // op vAA, thing@BBBBBBBB
k35c, // op {vC, vD, vE, vF, vG}, thing@BBBB (B: count, A: vG)
k3rc, // op {vCCCC .. v(CCCC+AA-1)}, meth@BBBB
k51l, // op vAA, #+BBBBBBBBBBBBBBBB
};
enum Flags {
kBranch = 0x01, // conditional or unconditional branch
kContinue = 0x02, // flow can continue to next statement
kSwitch = 0x04, // switch statement
kThrow = 0x08, // could cause an exception to be thrown
kReturn = 0x10, // returns, no additional statements
kInvoke = 0x20, // a flavor of invoke
// TODO: kUnconditional
};
// Returns the size in bytes of this instruction.
size_t Size() const;
// Returns a pointer to the next instruction in the stream.
const Instruction* Next() const;
// Name of the instruction.
const char* Name() const {
return kInstructionNames[Opcode()];
}
// Returns the opcode field of the instruction.
Code Opcode() const;
// Reads an instruction out of the stream at the specified address.
static Instruction* At(byte* code) {
CHECK(code != NULL);
return reinterpret_cast<Instruction*>(code);
}
// Returns the format of the current instruction.
InstructionFormat Format() const {
return kInstructionFormats[Opcode()];
}
// Returns true if this instruction is a branch.
bool IsBranch() const {
return (kInstructionFlags[Opcode()] & kBranch) != 0;
}
// Determine if the instruction is any of 'return' instructions.
bool IsReturn() const {
return (kInstructionFlags[Opcode()] & kReturn) != 0;
}
// Determine if this instruction ends execution of its basic block.
bool IsBasicBlockEnd() const {
return IsBranch() || IsReturn() || Opcode() == THROW;
}
// Determine if this instruction is an invoke.
bool IsInvoke() const {
return (kInstructionFlags[Opcode()] & kInvoke) != 0;
}
private:
static const char* const kInstructionNames[];
static InstructionFormat const kInstructionFormats[];
static int const kInstructionFlags[];
DISALLOW_IMPLICIT_CONSTRUCTORS(Instruction);
};
} // namespace art
#endif // ART_SRC_DEX_INSTRUCTION_H_
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