Question

Both move vA, vB and move-wide vA, vB involve the same operations and same operands. Except opcodes everything is the same. I am in a situation where I need to print the operands used by instructions in an application. So when I see the instruction move vA, vB I should print move va(*contents of va*), vb(*contents of vb*).
This works fine in the case of 4-byte registers. But when I encounter move-wide instructions, I should print the contents of vA and the contents of the next virtual register., contents of vB and the contents of the next virtual register.
What is the standard way of parsing these?

Answer 1

由于Dalvik和dx都是公开来源,回答有关dex案卷问题的最佳办法是检查其来源。 https://github.com/android/platform_dalvik/blob/master/dx/src/com/android/dx/io/instructions/DecodedInstruction.java” rel=“nofollow” DecodedInstruction.java 。它首先对密码进行编码,然后使用密码告知其余指示。

public static DecodedInstruction decode(CodeInput in) throws EOFException {
    int opcodeUnit = in.read();
    int opcode = Opcodes.extractOpcodeFromUnit(opcodeUnit);
    InstructionCodec format = OpcodeInfo.getFormat(opcode);
    return format.decode(opcodeUnit, in);
}

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