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117 lines
3.2 KiB
117 lines
3.2 KiB
/*
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* Copyright 2002-2019 Intel Corporation.
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*
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* This software is provided to you as Sample Source Code as defined in the accompanying
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* End User License Agreement for the Intel(R) Software Development Products ("Agreement")
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* section 1.L.
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*
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* This software and the related documents are provided as is, with no express or implied
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* warranties, other than those that are expressly stated in the License.
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*/
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/*
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* This file contains a Pintool for sampling the IPs of instruction executed.
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* It serves as an example of a more efficient way to write analysis routines
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* that include conditional tests.
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* Currently, it works on IA-32 and Intel(R) 64 architectures.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "pin.H"
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FILE * trace;
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const INT32 N = 100000;
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const INT32 M = 50000;
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INT32 icount = N;
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/*
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* IP-sampling could be done in a single analysis routine like:
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*
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* VOID IpSample(VOID *ip)
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* {
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* --icount;
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* if (icount == 0)
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* {
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* fprintf(trace, "%p\n", ip);
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* icount = N + rand() % M;
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* }
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* }
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*
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* However, we break IpSample() into two analysis routines,
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* CountDown() and PrintIp(), to facilitate Pin inlining CountDown()
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* (which is the much more frequently executed one than PrintIp()).
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*/
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ADDRINT CountDown()
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{
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--icount;
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return (icount==0);
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}
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// The IP of the current instruction will be printed and
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// the icount will be reset to a random number between N and N+M.
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VOID PrintIp(VOID *ip)
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{
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fprintf(trace, "%p\n", ip);
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// Prepare for next period
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icount = N + rand() % M; // random number from N to N+M
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}
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// Pin calls this function every time a new instruction is encountered
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VOID Instruction(INS ins, VOID *v)
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{
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// CountDown() is called for every instruction executed
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INS_InsertIfCall(ins, IPOINT_BEFORE, (AFUNPTR)CountDown, IARG_END);
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// PrintIp() is called only when the last CountDown() returns a non-zero value.
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INS_InsertThenCall(ins, IPOINT_BEFORE, (AFUNPTR)PrintIp, IARG_INST_PTR, IARG_END);
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}
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// This function is called when the application exits
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VOID Fini(INT32 code, VOID *v)
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{
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fprintf(trace, "#eof\n");
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fclose(trace);
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}
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/* ===================================================================== */
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/* Print Help Message */
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/* ===================================================================== */
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INT32 Usage()
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{
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PIN_ERROR( "This Pintool samples the IPs of instruction executed\n"
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+ KNOB_BASE::StringKnobSummary() + "\n");
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return -1;
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}
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/* ===================================================================== */
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/* Main */
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/* ===================================================================== */
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int main(int argc, char * argv[])
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{
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trace = fopen("isampling.out", "w");
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// Initialize pin
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if (PIN_Init(argc, argv)) return Usage();
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// Register Instruction to be called to instrument instructions
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INS_AddInstrumentFunction(Instruction, 0);
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// Register Fini to be called when the application exits
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PIN_AddFiniFunction(Fini, 0);
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// Start the program, never returns
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PIN_StartProgram();
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return 0;
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}
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