CompilerAutomatedInstrumentation.cpp

/*********************************************************************************************************************************************************************************************************************************************************************************************
#   Intel� Single Event API
#
#   This file is provided under the BSD 3-Clause license.
#   Copyright (c) 2021, Intel Corporation
#   All rights reserved.
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**********************************************************************************************************************************************************************************************************************************************************************************************/
#include "itt_notify.hpp"

extern __itt_domain* g_domain;
extern __itt_clock_domain* clock_domain;

#if defined(__linux__) && !defined(__ANDROID__)
thread_local bool g_bCAIRecursion = false;
extern "C" {
    void __cyg_profile_func_enter (void *, void *) __attribute__((no_instrument_function));
    void __cyg_profile_func_enter (void * fn, void *)
    {
        if (clock_domain && !g_bCAIRecursion)
        {
            g_bCAIRecursion = true;
            __itt_task_begin_fn(g_domain, __itt_null, __itt_null, fn);
            g_bCAIRecursion = false;
        }
    }
    void __cyg_profile_func_exit (void *, void *) __attribute__((no_instrument_function));
    void __cyg_profile_func_exit (void *, void *)
    {
        if (clock_domain && !g_bCAIRecursion)
        {
            g_bCAIRecursion = true;
            __itt_task_end(g_domain);
            g_bCAIRecursion = false;
        }
    }
}

#elif defined(_WIN32)

#if INTPTR_MAX == INT32_MAX //64 bits compiler doesn't support asm inlines
extern "C"
{
    void __declspec(naked) __cdecl _penter()
    {
        __asm pushad // Push all of the registers on to the stack
        if (clock_domain)
        {
            static void* instrumented_function = 0; //not thread safe at all!

            __asm
            {
                // Get the address of the return address which is 4 * 8 bytes into
                // the stack ("asm pushad" pushed 8 32-bit register values)
                mov  eax, esp
                add  eax, 32
                // Load the return address of the call to _penter
                mov  eax, dword ptr[eax]
                // Since _penter is always called 5 bytes after the function address, we can simply subtract
                // 1 (call inst) + 4 bytes (32-bit address) to set eax to the instrumented functions address
                sub  eax, 5
                mov instrumented_function, eax
            }
            __itt_task_begin_fn(g_domain, __itt_null, __itt_null, (void*)instrumented_function);
        }
        __asm popad // Pop all of the registers off of the stack
        __asm ret
    }
    void __declspec(naked) __cdecl _pexit()
    {
        __asm pushad // Push all of the registers on to the stack
        if (clock_domain) __itt_task_end(g_domain);
        __asm popad // Pop all of the registers off of the stack
        __asm ret

    }
}
#endif
#endif