/*===-- jitprofiling.c - JIT (Just-In-Time) Profiling API----------*- C -*-===*
*
* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
* See https://llvm.org/LICENSE.txt for license information.
* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
*
*===----------------------------------------------------------------------===*
*
* This file provides Intel(R) Performance Analyzer JIT (Just-In-Time)
* Profiling API implementation.
*
* NOTE: This file comes in a style different from the rest of LLVM
* source base since this is a piece of code shared from Intel(R)
* products. Please do not reformat / re-style this code to make
* subsequent merges and contributions from the original source base eaiser.
*
*===----------------------------------------------------------------------===*/
#include "ittnotify_config.h"
#if ITT_PLATFORM==ITT_PLATFORM_WIN
#include <windows.h>
#pragma optimize("", off)
#else /* ITT_PLATFORM==ITT_PLATFORM_WIN */
#include <dlfcn.h>
#include <pthread.h>
#include <stdint.h>
#endif /* ITT_PLATFORM==ITT_PLATFORM_WIN */
#include <stdlib.h>
#include "jitprofiling.h"
static const char rcsid[] = "\n@(#) $Revision: 243501 $\n";
#define DLL_ENVIRONMENT_VAR "VS_PROFILER"
#ifndef NEW_DLL_ENVIRONMENT_VAR
#if ITT_ARCH==ITT_ARCH_IA32
#define NEW_DLL_ENVIRONMENT_VAR "INTEL_JIT_PROFILER32"
#else
#define NEW_DLL_ENVIRONMENT_VAR "INTEL_JIT_PROFILER64"
#endif
#endif /* NEW_DLL_ENVIRONMENT_VAR */
#if ITT_PLATFORM==ITT_PLATFORM_WIN
#define DEFAULT_DLLNAME "JitPI.dll"
HINSTANCE m_libHandle = NULL;
#else /* ITT_PLATFORM==ITT_PLATFORM_WIN */
#define DEFAULT_DLLNAME "libJitPI.so"
void* m_libHandle = NULL;
#endif /* ITT_PLATFORM==ITT_PLATFORM_WIN */
/* default location of JIT profiling agent on Android */
#define ANDROID_JIT_AGENT_PATH "/data/intel/libittnotify.so"
/* the function pointers */
typedef unsigned int(*TPInitialize)(void);
static TPInitialize FUNC_Initialize=NULL;
typedef unsigned int(*TPNotify)(unsigned int, void*);
static TPNotify FUNC_NotifyEvent=NULL;
static iJIT_IsProfilingActiveFlags executionMode = iJIT_NOTHING_RUNNING;
/* end collector dll part. */
/* loadiJIT_Funcs() : this function is called just in the beginning
* and is responsible to load the functions from BistroJavaCollector.dll
* result:
* on success: the functions loads, iJIT_DLL_is_missing=0, return value = 1
* on failure: the functions are NULL, iJIT_DLL_is_missing=1, return value = 0
*/
static int loadiJIT_Funcs(void);
/* global representing whether the BistroJavaCollector can't be loaded */
static int iJIT_DLL_is_missing = 0;
/* Virtual stack - the struct is used as a virtual stack for each thread.
* Every thread initializes with a stack of size INIT_TOP_STACK.
* Every method entry decreases from the current stack point,
* and when a thread stack reaches its top of stack (return from the global
* function), the top of stack and the current stack increase. Notice that
* when returning from a function the stack pointer is the address of
* the function return.
*/
#if ITT_PLATFORM==ITT_PLATFORM_WIN
static DWORD threadLocalStorageHandle = 0;
#else /* ITT_PLATFORM==ITT_PLATFORM_WIN */
static pthread_key_t threadLocalStorageHandle = (pthread_key_t)0;
#endif /* ITT_PLATFORM==ITT_PLATFORM_WIN */
#define INIT_TOP_Stack 10000
typedef struct
{
unsigned int TopStack;
unsigned int CurrentStack;
} ThreadStack, *pThreadStack;
/* end of virtual stack. */
/*
* The function for reporting virtual-machine related events to VTune.
* Note: when reporting iJVM_EVENT_TYPE_ENTER_NIDS, there is no need to fill
* in the stack_id field in the iJIT_Method_NIDS structure, as VTune fills it.
* The return value in iJVM_EVENT_TYPE_ENTER_NIDS &&
* iJVM_EVENT_TYPE_LEAVE_NIDS events will be 0 in case of failure.
* in iJVM_EVENT_TYPE_METHOD_LOAD_FINISHED event
* it will be -1 if EventSpecificData == 0 otherwise it will be 0.
*/
ITT_EXTERN_C int JITAPI
iJIT_NotifyEvent(iJIT_JVM_EVENT event_type, void *EventSpecificData)
{
int ReturnValue;
/*
* This section is for debugging outside of VTune.
* It creates the environment variables that indicates call graph mode.
* If running outside of VTune remove the remark.
*
*
* static int firstTime = 1;
* char DoCallGraph[12] = "DoCallGraph";
* if (firstTime)
* {
* firstTime = 0;
* SetEnvironmentVariable( "BISTRO_COLLECTORS_DO_CALLGRAPH", DoCallGraph);
* }
*
* end of section.
*/
/* initialization part - the functions have not been loaded yet. This part
* will load the functions, and check if we are in Call Graph mode.
* (for special treatment).
*/
if (!FUNC_NotifyEvent)
{
if (iJIT_DLL_is_missing)
return 0;
/* load the Function from the DLL */
if (!loadiJIT_Funcs())
return 0;
/* Call Graph initialization. */
}
/* If the event is method entry/exit, check that in the current mode
* VTune is allowed to receive it
*/
if ((event_type == iJVM_EVENT_TYPE_ENTER_NIDS ||
event_type == iJVM_EVENT_TYPE_LEAVE_NIDS) &&
(executionMode != iJIT_CALLGRAPH_ON))
{
return 0;
}
/* This section is performed when method enter event occurs.
* It updates the virtual stack, or creates it if this is the first
* method entry in the thread. The stack pointer is decreased.
*/
if (event_type == iJVM_EVENT_TYPE_ENTER_NIDS)
{
#if ITT_PLATFORM==ITT_PLATFORM_WIN
pThreadStack threadStack =
(pThreadStack)TlsGetValue (threadLocalStorageHandle);
#else /* ITT_PLATFORM==ITT_PLATFORM_WIN */
pThreadStack threadStack =
(pThreadStack)pthread_getspecific(threadLocalStorageHandle);
#endif /* ITT_PLATFORM==ITT_PLATFORM_WIN */
/* check for use of reserved method IDs */
if ( ((piJIT_Method_NIDS) EventSpecificData)->method_id <= 999 )
return 0;
if (!threadStack)
{
/* initialize the stack. */
threadStack = (pThreadStack) calloc (sizeof(ThreadStack), 1);
threadStack->TopStack = INIT_TOP_Stack;
threadStack->CurrentStack = INIT_TOP_Stack;
#if ITT_PLATFORM==ITT_PLATFORM_WIN
TlsSetValue(threadLocalStorageHandle,(void*)threadStack);
#else /* ITT_PLATFORM==ITT_PLATFORM_WIN */
pthread_setspecific(threadLocalStorageHandle,(void*)threadStack);
#endif /* ITT_PLATFORM==ITT_PLATFORM_WIN */
}
/* decrease the stack. */
((piJIT_Method_NIDS) EventSpecificData)->stack_id =
(threadStack->CurrentStack)--;
}
/* This section is performed when method leave event occurs
* It updates the virtual stack.
* Increases the stack pointer.
* If the stack pointer reached the top (left the global function)
* increase the pointer and the top pointer.
*/
if (event_type == iJVM_EVENT_TYPE_LEAVE_NIDS)
{
#if ITT_PLATFORM==ITT_PLATFORM_WIN
pThreadStack threadStack =
(pThreadStack)TlsGetValue (threadLocalStorageHandle);
#else /* ITT_PLATFORM==ITT_PLATFORM_WIN */
pThreadStack threadStack =
(pThreadStack)pthread_getspecific(threadLocalStorageHandle);
#endif /* ITT_PLATFORM==ITT_PLATFORM_WIN */
/* check for use of reserved method IDs */
if ( ((piJIT_Method_NIDS) EventSpecificData)->method_id <= 999 )
return 0;
if (!threadStack)
{
/* Error: first report in this thread is method exit */
exit (1);
}
((piJIT_Method_NIDS) EventSpecificData)->stack_id =
++(threadStack->CurrentStack) + 1;
if (((piJIT_Method_NIDS) EventSpecificData)->stack_id
> threadStack->TopStack)
((piJIT_Method_NIDS) EventSpecificData)->stack_id =
(unsigned int)-1;
}
if (event_type == iJVM_EVENT_TYPE_METHOD_LOAD_FINISHED)
{
/* check for use of reserved method IDs */
if ( ((piJIT_Method_Load) EventSpecificData)->method_id <= 999 )
return 0;
}
ReturnValue = (int)FUNC_NotifyEvent(event_type, EventSpecificData);
return ReturnValue;
}
/* The new mode call back routine */
ITT_EXTERN_C void JITAPI
iJIT_RegisterCallbackEx(void *userdata, iJIT_ModeChangedEx
NewModeCallBackFuncEx)
{
/* is it already missing... or the load of functions from the DLL failed */
if (iJIT_DLL_is_missing || !loadiJIT_Funcs())
{
/* then do not bother with notifications */
NewModeCallBackFuncEx(userdata, iJIT_NO_NOTIFICATIONS);
/* Error: could not load JIT functions. */
return;
}
/* nothing to do with the callback */
}
/*
* This function allows the user to query in which mode, if at all,
*VTune is running
*/
ITT_EXTERN_C iJIT_IsProfilingActiveFlags JITAPI iJIT_IsProfilingActive(void)
{
if (!iJIT_DLL_is_missing)
{
loadiJIT_Funcs();
}
return executionMode;
}
/* this function loads the collector dll (BistroJavaCollector)
* and the relevant functions.
* on success: all functions load, iJIT_DLL_is_missing = 0, return value = 1
* on failure: all functions are NULL, iJIT_DLL_is_missing = 1, return value = 0
*/
static int loadiJIT_Funcs(void)
{
static int bDllWasLoaded = 0;
char *dllName = (char*)rcsid; /* !! Just to avoid unused code elimination */
#if ITT_PLATFORM==ITT_PLATFORM_WIN
DWORD dNameLength = 0;
#endif /* ITT_PLATFORM==ITT_PLATFORM_WIN */
if(bDllWasLoaded)
{
/* dll was already loaded, no need to do it for the second time */
return 1;
}
/* Assumes that the DLL will not be found */
iJIT_DLL_is_missing = 1;
FUNC_NotifyEvent = NULL;
if (m_libHandle)
{
#if ITT_PLATFORM==ITT_PLATFORM_WIN
FreeLibrary(m_libHandle);
#else /* ITT_PLATFORM==ITT_PLATFORM_WIN */
dlclose(m_libHandle);
#endif /* ITT_PLATFORM==ITT_PLATFORM_WIN */
m_libHandle = NULL;
}
/* Try to get the dll name from the environment */
#if ITT_PLATFORM==ITT_PLATFORM_WIN
dNameLength = GetEnvironmentVariableA(NEW_DLL_ENVIRONMENT_VAR, NULL, 0);
if (dNameLength)
{
DWORD envret = 0;
dllName = (char*)malloc(sizeof(char) * (dNameLength + 1));
envret = GetEnvironmentVariableA(NEW_DLL_ENVIRONMENT_VAR,
dllName, dNameLength);
if (envret)
{
/* Try to load the dll from the PATH... */
m_libHandle = LoadLibraryExA(dllName,
NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
}
free(dllName);
} else {
/* Try to use old VS_PROFILER variable */
dNameLength = GetEnvironmentVariableA(DLL_ENVIRONMENT_VAR, NULL, 0);
if (dNameLength)
{
DWORD envret = 0;
dllName = (char*)malloc(sizeof(char) * (dNameLength + 1));
envret = GetEnvironmentVariableA(DLL_ENVIRONMENT_VAR,
dllName, dNameLength);
if (envret)
{
/* Try to load the dll from the PATH... */
m_libHandle = LoadLibraryA(dllName);
}
free(dllName);
}
}
#else /* ITT_PLATFORM==ITT_PLATFORM_WIN */
dllName = getenv(NEW_DLL_ENVIRONMENT_VAR);
if (!dllName)
dllName = getenv(DLL_ENVIRONMENT_VAR);
#ifdef ANDROID
if (!dllName)
dllName = ANDROID_JIT_AGENT_PATH;
#endif
if (dllName)
{
/* Try to load the dll from the PATH... */
m_libHandle = dlopen(dllName, RTLD_LAZY);
}
#endif /* ITT_PLATFORM==ITT_PLATFORM_WIN */
if (!m_libHandle)
{
#if ITT_PLATFORM==ITT_PLATFORM_WIN
m_libHandle = LoadLibraryA(DEFAULT_DLLNAME);
#else /* ITT_PLATFORM==ITT_PLATFORM_WIN */
m_libHandle = dlopen(DEFAULT_DLLNAME, RTLD_LAZY);
#endif /* ITT_PLATFORM==ITT_PLATFORM_WIN */
}
/* if the dll wasn't loaded - exit. */
if (!m_libHandle)
{
iJIT_DLL_is_missing = 1; /* don't try to initialize
* JIT agent the second time
*/
return 0;
}
#if ITT_PLATFORM==ITT_PLATFORM_WIN
FUNC_NotifyEvent = (TPNotify)GetProcAddress(m_libHandle, "NotifyEvent");
#else /* ITT_PLATFORM==ITT_PLATFORM_WIN */
FUNC_NotifyEvent = (TPNotify)(intptr_t)dlsym(m_libHandle, "NotifyEvent");
#endif /* ITT_PLATFORM==ITT_PLATFORM_WIN */
if (!FUNC_NotifyEvent)
{
FUNC_Initialize = NULL;
return 0;
}
#if ITT_PLATFORM==ITT_PLATFORM_WIN
FUNC_Initialize = (TPInitialize)GetProcAddress(m_libHandle, "Initialize");
#else /* ITT_PLATFORM==ITT_PLATFORM_WIN */
FUNC_Initialize = (TPInitialize)(intptr_t)dlsym(m_libHandle, "Initialize");
#endif /* ITT_PLATFORM==ITT_PLATFORM_WIN */
if (!FUNC_Initialize)
{
FUNC_NotifyEvent = NULL;
return 0;
}
executionMode = (iJIT_IsProfilingActiveFlags)FUNC_Initialize();
bDllWasLoaded = 1;
iJIT_DLL_is_missing = 0; /* DLL is ok. */
/*
* Call Graph mode: init the thread local storage
* (need to store the virtual stack there).
*/
if ( executionMode == iJIT_CALLGRAPH_ON )
{
/* Allocate a thread local storage slot for the thread "stack" */
if (!threadLocalStorageHandle)
#if ITT_PLATFORM==ITT_PLATFORM_WIN
threadLocalStorageHandle = TlsAlloc();
#else /* ITT_PLATFORM==ITT_PLATFORM_WIN */
pthread_key_create(&threadLocalStorageHandle, NULL);
#endif /* ITT_PLATFORM==ITT_PLATFORM_WIN */
}
return 1;
}
/*
* This function should be called by the user whenever a thread ends,
* to free the thread "virtual stack" storage
*/
ITT_EXTERN_C void JITAPI FinalizeThread(void)
{
if (threadLocalStorageHandle)
{
#if ITT_PLATFORM==ITT_PLATFORM_WIN
pThreadStack threadStack =
(pThreadStack)TlsGetValue (threadLocalStorageHandle);
#else /* ITT_PLATFORM==ITT_PLATFORM_WIN */
pThreadStack threadStack =
(pThreadStack)pthread_getspecific(threadLocalStorageHandle);
#endif /* ITT_PLATFORM==ITT_PLATFORM_WIN */
if (threadStack)
{
free (threadStack);
threadStack = NULL;
#if ITT_PLATFORM==ITT_PLATFORM_WIN
TlsSetValue (threadLocalStorageHandle, threadStack);
#else /* ITT_PLATFORM==ITT_PLATFORM_WIN */
pthread_setspecific(threadLocalStorageHandle, threadStack);
#endif /* ITT_PLATFORM==ITT_PLATFORM_WIN */
}
}
}
/*
* This function should be called by the user when the process ends,
* to free the local storage index
*/
ITT_EXTERN_C void JITAPI FinalizeProcess(void)
{
if (m_libHandle)
{
#if ITT_PLATFORM==ITT_PLATFORM_WIN
FreeLibrary(m_libHandle);
#else /* ITT_PLATFORM==ITT_PLATFORM_WIN */
dlclose(m_libHandle);
#endif /* ITT_PLATFORM==ITT_PLATFORM_WIN */
m_libHandle = NULL;
}
if (threadLocalStorageHandle)
#if ITT_PLATFORM==ITT_PLATFORM_WIN
TlsFree (threadLocalStorageHandle);
#else /* ITT_PLATFORM==ITT_PLATFORM_WIN */
pthread_key_delete(threadLocalStorageHandle);
#endif /* ITT_PLATFORM==ITT_PLATFORM_WIN */
}
/*
* This function should be called by the user for any method once.
* The function will return a unique method ID, the user should maintain
* the ID for each method
*/
ITT_EXTERN_C unsigned int JITAPI iJIT_GetNewMethodID(void)
{
static unsigned int methodID = 0x100000;
if (methodID == 0)
return 0; /* ERROR : this is not a valid value */
return methodID++;
}
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