c++ - 什么是PC物化？

Question

我正在使用一个名为 Intel Pin 的二进制检测工具。 .然而，当我检查 Pin 附带的部分示例时，我遇到了这个奇怪的术语。这是相关部分:

VOID CallTrace(TRACE trace, INS ins)
{
    if (!KnobTraceCalls)
        return;

    if (INS_IsCall(ins) && !INS_IsDirectBranchOrCall(ins))
    {
        // Indirect call
        string s = "Call " + FormatAddress(INS_Address(ins), TRACE_Rtn(trace));
        s += " -> ";

        INS_InsertCall(ins, IPOINT_BEFORE, AFUNPTR(EmitIndirectCall), IARG_THREAD_ID,
                       IARG_PTR, new string(s), IARG_BRANCH_TARGET_ADDR,
                       IARG_G_ARG0_CALLER, IARG_G_ARG1_CALLER, IARG_END);
    }
    else if (INS_IsDirectBranchOrCall(ins))
    {
        // Is this a tail call?
        RTN sourceRtn = TRACE_Rtn(trace);
        RTN destRtn = RTN_FindByAddress(INS_DirectBranchOrCallTargetAddress(ins));

        if (INS_IsCall(ins)         // conventional call
            || sourceRtn != destRtn // tail call
        )
        {
            BOOL tailcall = !INS_IsCall(ins);

            string s = "";
            if (tailcall)
            {
                s += "Tailcall ";
            }
            else
            {
                if( INS_IsProcedureCall(ins) )
                    s += "Call ";
                else
                {
                    s += "PcMaterialization ";
                    tailcall=1;
                }

            }

            //s += INS_Mnemonic(ins) + " ";

            s += FormatAddress(INS_Address(ins), TRACE_Rtn(trace));
            s += " -> ";

            ADDRINT target = INS_DirectBranchOrCallTargetAddress(ins);

            s += FormatAddress(target, RTN_FindByAddress(target));

            INS_InsertCall(ins, IPOINT_BEFORE, AFUNPTR(EmitDirectCall),
                           IARG_THREAD_ID, IARG_PTR, new string(s), IARG_BOOL, tailcall,
                           IARG_G_ARG0_CALLER, IARG_G_ARG1_CALLER, IARG_END);
        }
    }
    else if (INS_IsRet(ins))
    {
        RTN rtn =  TRACE_Rtn(trace);

#if defined(TARGET_LINUX) && defined(TARGET_IA32)
//        if( RTN_Name(rtn) ==  "_dl_debug_state") return;
        if( RTN_Valid(rtn) && RTN_Name(rtn) ==  "_dl_runtime_resolve") return;
#endif
        string tracestring = "Return " + FormatAddress(INS_Address(ins), rtn);
        INS_InsertCall(ins, IPOINT_BEFORE, AFUNPTR(EmitReturn),
                       IARG_THREAD_ID, IARG_PTR, new string(tracestring), IARG_G_RESULT0, IARG_END);
    }
}

此方法确定指令实际上在做什么(直接调用、间接调用、尾调用、返回和未知的 Pc Materialization)。

这是 full code .

那到底是什么意思呢？我尝试使用谷歌搜索 - 没有相关结果。

Answer 1

BOOL LEVEL_CORE::INS_IsPcMaterialization ( INS ins )

返回:如果这是对下一条指令的调用，则为真，这是实现指令指针的习惯用法

Check it