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pjs/xpcom/base/nsStackWalk.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set shiftwidth=4 tabstop=8 autoindent cindent expandtab: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla stack walking code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Michael Judge, 20-December-2000
* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* API for getting a stack trace of the C/C++ stack on the current thread */
#include "nsStackWalk.h"
#if defined(_WIN32) && (defined(_M_IX86) || defined(_M_AMD64) || defined(_M_IA64)) && !defined(WINCE) // WIN32 x86 stack walking code
#include "nscore.h"
#include <windows.h>
#include <process.h>
#include <stdio.h>
#include "plstr.h"
#include "nsMemory.h" // for NS_ARRAY_LENGTH
#include "nspr.h"
#ifdef _M_IX86
#include <imagehlp.h>
// We need a way to know if we are building for WXP (or later), as if we are, we
// need to use the newer 64-bit APIs. API_VERSION_NUMBER seems to fit the bill.
// A value of 9 indicates we want to use the new APIs.
#if API_VERSION_NUMBER >= 9
#define USING_WXP_VERSION 1
#endif
#endif
// Define these as static pointers so that we can load the DLL on the
// fly (and not introduce a link-time dependency on it). Tip o' the
// hat to Matt Pietrick for this idea. See:
//
// http://msdn.microsoft.com/library/periodic/period97/F1/D3/S245C6.htm
//
PR_BEGIN_EXTERN_C
typedef DWORD (__stdcall *SYMSETOPTIONSPROC)(DWORD);
extern SYMSETOPTIONSPROC _SymSetOptions;
typedef BOOL (__stdcall *SYMINITIALIZEPROC)(HANDLE, LPSTR, BOOL);
extern SYMINITIALIZEPROC _SymInitialize;
typedef BOOL (__stdcall *SYMCLEANUPPROC)(HANDLE);
extern SYMCLEANUPPROC _SymCleanup;
typedef BOOL (__stdcall *STACKWALKPROC)(DWORD,
HANDLE,
HANDLE,
LPSTACKFRAME,
LPVOID,
PREAD_PROCESS_MEMORY_ROUTINE,
PFUNCTION_TABLE_ACCESS_ROUTINE,
PGET_MODULE_BASE_ROUTINE,
PTRANSLATE_ADDRESS_ROUTINE);
extern STACKWALKPROC _StackWalk;
#ifdef USING_WXP_VERSION
typedef BOOL (__stdcall *STACKWALKPROC64)(DWORD,
HANDLE,
HANDLE,
LPSTACKFRAME64,
PVOID,
PREAD_PROCESS_MEMORY_ROUTINE64,
PFUNCTION_TABLE_ACCESS_ROUTINE64,
PGET_MODULE_BASE_ROUTINE64,
PTRANSLATE_ADDRESS_ROUTINE64);
extern STACKWALKPROC64 _StackWalk64;
#endif
typedef LPVOID (__stdcall *SYMFUNCTIONTABLEACCESSPROC)(HANDLE, DWORD);
extern SYMFUNCTIONTABLEACCESSPROC _SymFunctionTableAccess;
#ifdef USING_WXP_VERSION
typedef LPVOID (__stdcall *SYMFUNCTIONTABLEACCESSPROC64)(HANDLE, DWORD64);
extern SYMFUNCTIONTABLEACCESSPROC64 _SymFunctionTableAccess64;
#endif
typedef DWORD (__stdcall *SYMGETMODULEBASEPROC)(HANDLE, DWORD);
extern SYMGETMODULEBASEPROC _SymGetModuleBase;
#ifdef USING_WXP_VERSION
typedef DWORD64 (__stdcall *SYMGETMODULEBASEPROC64)(HANDLE, DWORD64);
extern SYMGETMODULEBASEPROC64 _SymGetModuleBase64;
#endif
typedef BOOL (__stdcall *SYMGETSYMFROMADDRPROC)(HANDLE, DWORD, PDWORD, PIMAGEHLP_SYMBOL);
extern SYMGETSYMFROMADDRPROC _SymGetSymFromAddr;
#ifdef USING_WXP_VERSION
typedef BOOL (__stdcall *SYMFROMADDRPROC)(HANDLE, DWORD64, PDWORD64, PSYMBOL_INFO);
extern SYMFROMADDRPROC _SymFromAddr;
#endif
typedef DWORD ( __stdcall *SYMLOADMODULE)(HANDLE, HANDLE, PSTR, PSTR, DWORD, DWORD);
extern SYMLOADMODULE _SymLoadModule;
#ifdef USING_WXP_VERSION
typedef DWORD ( __stdcall *SYMLOADMODULE64)(HANDLE, HANDLE, PCSTR, PCSTR, DWORD64, DWORD);
extern SYMLOADMODULE64 _SymLoadModule64;
#endif
typedef DWORD ( __stdcall *SYMUNDNAME)(PIMAGEHLP_SYMBOL, PSTR, DWORD);
extern SYMUNDNAME _SymUnDName;
typedef DWORD ( __stdcall *SYMGETMODULEINFO)( HANDLE, DWORD, PIMAGEHLP_MODULE);
extern SYMGETMODULEINFO _SymGetModuleInfo;
#ifdef USING_WXP_VERSION
typedef BOOL ( __stdcall *SYMGETMODULEINFO64)( HANDLE, DWORD64, PIMAGEHLP_MODULE64);
extern SYMGETMODULEINFO64 _SymGetModuleInfo64;
#endif
typedef BOOL ( __stdcall *ENUMLOADEDMODULES)( HANDLE, PENUMLOADED_MODULES_CALLBACK, PVOID);
extern ENUMLOADEDMODULES _EnumerateLoadedModules;
#ifdef USING_WXP_VERSION
typedef BOOL ( __stdcall *ENUMLOADEDMODULES64)( HANDLE, PENUMLOADED_MODULES_CALLBACK64, PVOID);
extern ENUMLOADEDMODULES64 _EnumerateLoadedModules64;
#endif
typedef BOOL (__stdcall *SYMGETLINEFROMADDRPROC)(HANDLE, DWORD, PDWORD, PIMAGEHLP_LINE);
extern SYMGETLINEFROMADDRPROC _SymGetLineFromAddr;
#ifdef USING_WXP_VERSION
typedef BOOL (__stdcall *SYMGETLINEFROMADDRPROC64)(HANDLE, DWORD64, PDWORD, PIMAGEHLP_LINE64);
extern SYMGETLINEFROMADDRPROC64 _SymGetLineFromAddr64;
#endif
extern HANDLE hStackWalkMutex;
HANDLE GetCurrentPIDorHandle();
PRBool EnsureSymInitialized();
PRBool EnsureImageHlpInitialized();
/*
* SymGetModuleInfoEspecial
*
* Attempt to determine the module information.
* Bug 112196 says this DLL may not have been loaded at the time
* SymInitialize was called, and thus the module information
* and symbol information is not available.
* This code rectifies that problem.
* Line information is optional.
*/
BOOL SymGetModuleInfoEspecial(HANDLE aProcess, DWORD aAddr, PIMAGEHLP_MODULE aModuleInfo, PIMAGEHLP_LINE aLineInfo);
struct WalkStackData {
PRUint32 skipFrames;
HANDLE thread;
HANDLE process;
HANDLE eventStart;
HANDLE eventEnd;
void **pcs;
PRUint32 pc_size;
PRUint32 pc_count;
};
void PrintError(char *prefix, WalkStackData* data);
unsigned int WINAPI WalkStackThread(void* data);
void WalkStackMain64(struct WalkStackData* data);
void WalkStackMain(struct WalkStackData* data);
// Define these as static pointers so that we can load the DLL on the
// fly (and not introduce a link-time dependency on it). Tip o' the
// hat to Matt Pietrick for this idea. See:
//
// http://msdn.microsoft.com/library/periodic/period97/F1/D3/S245C6.htm
//
SYMSETOPTIONSPROC _SymSetOptions;
SYMINITIALIZEPROC _SymInitialize;
SYMCLEANUPPROC _SymCleanup;
STACKWALKPROC _StackWalk;
#ifdef USING_WXP_VERSION
STACKWALKPROC64 _StackWalk64;
#else
#define _StackWalk64 0
#endif
SYMFUNCTIONTABLEACCESSPROC _SymFunctionTableAccess;
#ifdef USING_WXP_VERSION
SYMFUNCTIONTABLEACCESSPROC64 _SymFunctionTableAccess64;
#else
#define _SymFunctionTableAccess64 0
#endif
SYMGETMODULEBASEPROC _SymGetModuleBase;
#ifdef USING_WXP_VERSION
SYMGETMODULEBASEPROC64 _SymGetModuleBase64;
#else
#define _SymGetModuleBase64 0
#endif
SYMGETSYMFROMADDRPROC _SymGetSymFromAddr;
#ifdef USING_WXP_VERSION
SYMFROMADDRPROC _SymFromAddr;
#else
#define _SymFromAddr 0
#endif
SYMLOADMODULE _SymLoadModule;
#ifdef USING_WXP_VERSION
SYMLOADMODULE64 _SymLoadModule64;
#else
#define _SymLoadModule64 0
#endif
SYMUNDNAME _SymUnDName;
SYMGETMODULEINFO _SymGetModuleInfo;
#ifdef USING_WXP_VERSION
SYMGETMODULEINFO64 _SymGetModuleInfo64;
#else
#define _SymGetModuleInfo64 0
#endif
ENUMLOADEDMODULES _EnumerateLoadedModules;
#ifdef USING_WXP_VERSION
ENUMLOADEDMODULES64 _EnumerateLoadedModules64;
#else
#define _EnumerateLoadedModules64 0
#endif
SYMGETLINEFROMADDRPROC _SymGetLineFromAddr;
#ifdef USING_WXP_VERSION
SYMGETLINEFROMADDRPROC64 _SymGetLineFromAddr64;
#else
#define _SymGetLineFromAddr64 0
#endif
DWORD gStackWalkThread;
CRITICAL_SECTION gDbgHelpCS;
PR_END_EXTERN_C
// Routine to print an error message to standard error.
// Will also call callback with error, if data supplied.
void PrintError(char *prefix)
{
LPVOID lpMsgBuf;
DWORD lastErr = GetLastError();
FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
lastErr,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPTSTR) &lpMsgBuf,
0,
NULL
);
fprintf(stderr, "### ERROR: %s: %s",
prefix, lpMsgBuf ? lpMsgBuf : "(null)\n");
fflush(stderr);
LocalFree( lpMsgBuf );
}
PRBool
EnsureImageHlpInitialized()
{
static PRBool gInitialized = PR_FALSE;
if (gInitialized)
return gInitialized;
// Hope that our first call doesn't happen during static
// initialization. If it does, this CreateThread call won't
// actually start the thread until after the static initialization
// is done, which means we'll deadlock while waiting for it to
// process a stack.
HANDLE readyEvent = ::CreateEvent(NULL, FALSE /* auto-reset*/,
FALSE /* initially non-signaled */, NULL);
unsigned int threadID;
HANDLE hStackWalkThread = (HANDLE)
_beginthreadex(NULL, 0, WalkStackThread, (void*)readyEvent,
0, &threadID);
gStackWalkThread = threadID;
if (hStackWalkThread == NULL) {
PrintError("CreateThread");
return PR_FALSE;
}
::CloseHandle(hStackWalkThread);
// Wait for the thread's event loop to start before posting events to it.
::WaitForSingleObject(readyEvent, INFINITE);
::CloseHandle(readyEvent);
::InitializeCriticalSection(&gDbgHelpCS);
HMODULE module = ::LoadLibrary("DBGHELP.DLL");
if (!module) {
module = ::LoadLibrary("IMAGEHLP.DLL");
if (!module) return PR_FALSE;
}
_SymSetOptions = (SYMSETOPTIONSPROC) ::GetProcAddress(module, "SymSetOptions");
if (!_SymSetOptions) return PR_FALSE;
_SymInitialize = (SYMINITIALIZEPROC) ::GetProcAddress(module, "SymInitialize");
if (!_SymInitialize) return PR_FALSE;
_SymCleanup = (SYMCLEANUPPROC)GetProcAddress(module, "SymCleanup");
if (!_SymCleanup) return PR_FALSE;
#ifdef USING_WXP_VERSION
_StackWalk64 = (STACKWALKPROC64)GetProcAddress(module, "StackWalk64");
#endif
_StackWalk = (STACKWALKPROC)GetProcAddress(module, "StackWalk");
if (!_StackWalk64 && !_StackWalk) return PR_FALSE;
#ifdef USING_WXP_VERSION
_SymFunctionTableAccess64 = (SYMFUNCTIONTABLEACCESSPROC64) GetProcAddress(module, "SymFunctionTableAccess64");
#endif
_SymFunctionTableAccess = (SYMFUNCTIONTABLEACCESSPROC) GetProcAddress(module, "SymFunctionTableAccess");
if (!_SymFunctionTableAccess64 && !_SymFunctionTableAccess) return PR_FALSE;
#ifdef USING_WXP_VERSION
_SymGetModuleBase64 = (SYMGETMODULEBASEPROC64)GetProcAddress(module, "SymGetModuleBase64");
#endif
_SymGetModuleBase = (SYMGETMODULEBASEPROC)GetProcAddress(module, "SymGetModuleBase");
if (!_SymGetModuleBase64 && !_SymGetModuleBase) return PR_FALSE;
_SymGetSymFromAddr = (SYMGETSYMFROMADDRPROC)GetProcAddress(module, "SymGetSymFromAddr");
#ifdef USING_WXP_VERSION
_SymFromAddr = (SYMFROMADDRPROC)GetProcAddress(module, "SymFromAddr");
#endif
if (!_SymFromAddr && !_SymGetSymFromAddr) return PR_FALSE;
#ifdef USING_WXP_VERSION
_SymLoadModule64 = (SYMLOADMODULE64)GetProcAddress(module, "SymLoadModule64");
#endif
_SymLoadModule = (SYMLOADMODULE)GetProcAddress(module, "SymLoadModule");
if (!_SymLoadModule64 && !_SymLoadModule) return PR_FALSE;
_SymUnDName = (SYMUNDNAME)GetProcAddress(module, "SymUnDName");
if (!_SymUnDName) return PR_FALSE;
#ifdef USING_WXP_VERSION
_SymGetModuleInfo64 = (SYMGETMODULEINFO64)GetProcAddress(module, "SymGetModuleInfo64");
#endif
_SymGetModuleInfo = (SYMGETMODULEINFO)GetProcAddress(module, "SymGetModuleInfo");
if (!_SymGetModuleInfo64 && !_SymGetModuleInfo) return PR_FALSE;
#ifdef USING_WXP_VERSION
_EnumerateLoadedModules64 = (ENUMLOADEDMODULES64)GetProcAddress(module, "EnumerateLoadedModules64");
#endif
_EnumerateLoadedModules = (ENUMLOADEDMODULES)GetProcAddress(module, "EnumerateLoadedModules");
if (!_EnumerateLoadedModules64 && !_EnumerateLoadedModules) return PR_FALSE;
#ifdef USING_WXP_VERSION
_SymGetLineFromAddr64 = (SYMGETLINEFROMADDRPROC64)GetProcAddress(module, "SymGetLineFromAddr64");
#endif
_SymGetLineFromAddr = (SYMGETLINEFROMADDRPROC)GetProcAddress(module, "SymGetLineFromAddr");
if (!_SymGetLineFromAddr64 && !_SymGetLineFromAddr) return PR_FALSE;
return gInitialized = PR_TRUE;
}
void
WalkStackMain64(struct WalkStackData* data)
{
#ifdef USING_WXP_VERSION
// Get the context information for the thread. That way we will
// know where our sp, fp, pc, etc. are and can fill in the
// STACKFRAME64 with the initial values.
CONTEXT context;
HANDLE myProcess = data->process;
HANDLE myThread = data->thread;
DWORD64 addr;
STACKFRAME64 frame64;
int skip = 3 + data->skipFrames; // skip our own stack walking frames
BOOL ok;
// Get a context for the specified thread.
memset(&context, 0, sizeof(CONTEXT));
context.ContextFlags = CONTEXT_FULL;
if (!GetThreadContext(myThread, &context)) {
PrintError("GetThreadContext");
return;
}
// Setup initial stack frame to walk from
memset(&frame64, 0, sizeof(frame64));
#ifdef _M_IX86
frame64.AddrPC.Offset = context.Eip;
frame64.AddrStack.Offset = context.Esp;
frame64.AddrFrame.Offset = context.Ebp;
#elif defined _M_AMD64
frame64.AddrPC.Offset = context.Rip;
frame64.AddrStack.Offset = context.Rsp;
frame64.AddrFrame.Offset = context.Rbp;
#elif defined _M_IA64
frame64.AddrPC.Offset = context.StIIP;
frame64.AddrStack.Offset = context.SP;
frame64.AddrFrame.Offset = context.RsBSP;
#else
#error "Should not have compiled this code"
#endif
frame64.AddrPC.Mode = AddrModeFlat;
frame64.AddrStack.Mode = AddrModeFlat;
frame64.AddrFrame.Mode = AddrModeFlat;
frame64.AddrReturn.Mode = AddrModeFlat;
// Now walk the stack
while (1) {
// debug routines are not threadsafe, so grab the lock.
EnterCriticalSection(&gDbgHelpCS);
ok = _StackWalk64(
#ifdef _M_AMD64
IMAGE_FILE_MACHINE_AMD64,
#elif defined _M_IA64
IMAGE_FILE_MACHINE_IA64,
#elif defined _M_IX86
IMAGE_FILE_MACHINE_I386,
#else
#error "Should not have compiled this code"
#endif
myProcess,
myThread,
&frame64,
&context,
NULL,
_SymFunctionTableAccess64, // function table access routine
_SymGetModuleBase64, // module base routine
0
);
LeaveCriticalSection(&gDbgHelpCS);
if (ok)
addr = frame64.AddrPC.Offset;
else {
addr = 0;
PrintError("WalkStack64");
}
if (!ok || (addr == 0)) {
break;
}
if (skip-- > 0) {
continue;
}
if (data->pc_count < data->pc_size)
data->pcs[data->pc_count] = (void*)addr;
++data->pc_count;
if (frame64.AddrReturn.Offset == 0)
break;
}
return;
#endif
}
void
WalkStackMain(struct WalkStackData* data)
{
// Get the context information for the thread. That way we will
// know where our sp, fp, pc, etc. are and can fill in the
// STACKFRAME with the initial values.
CONTEXT context;
HANDLE myProcess = data->process;
HANDLE myThread = data->thread;
DWORD addr;
STACKFRAME frame;
int skip = data->skipFrames; // skip our own stack walking frames
BOOL ok;
// Get a context for the specified thread.
memset(&context, 0, sizeof(CONTEXT));
context.ContextFlags = CONTEXT_FULL;
if (!GetThreadContext(myThread, &context)) {
PrintError("GetThreadContext");
return;
}
// Setup initial stack frame to walk from
#if defined _M_IX86
memset(&frame, 0, sizeof(frame));
frame.AddrPC.Offset = context.Eip;
frame.AddrPC.Mode = AddrModeFlat;
frame.AddrStack.Offset = context.Esp;
frame.AddrStack.Mode = AddrModeFlat;
frame.AddrFrame.Offset = context.Ebp;
frame.AddrFrame.Mode = AddrModeFlat;
#else
PrintError("Unknown platform. No stack walking.");
return;
#endif
// Now walk the stack
while (1) {
// debug routines are not threadsafe, so grab the lock.
EnterCriticalSection(&gDbgHelpCS);
ok = _StackWalk(
IMAGE_FILE_MACHINE_I386,
myProcess,
myThread,
&frame,
&context,
0, // read process memory routine
_SymFunctionTableAccess, // function table access routine
_SymGetModuleBase, // module base routine
0 // translate address routine
);
LeaveCriticalSection(&gDbgHelpCS);
if (ok)
addr = frame.AddrPC.Offset;
else {
addr = 0;
PrintError("WalkStack");
}
if (!ok || (addr == 0)) {
break;
}
if (skip-- > 0) {
continue;
}
if (data->pc_count < data->pc_size)
data->pcs[data->pc_count] = (void*)addr;
++data->pc_count;
if (frame.AddrReturn.Offset == 0)
break;
}
return;
}
unsigned int WINAPI
WalkStackThread(void* aData)
{
BOOL msgRet;
MSG msg;
// Call PeekMessage to force creation of a message queue so that
// other threads can safely post events to us.
::PeekMessage(&msg, NULL, WM_USER, WM_USER, PM_NOREMOVE);
// and tell the thread that created us that we're ready.
HANDLE readyEvent = (HANDLE)aData;
::SetEvent(readyEvent);
while ((msgRet = ::GetMessage(&msg, (HWND)-1, 0, 0)) != 0) {
if (msgRet == -1) {
PrintError("GetMessage");
} else {
DWORD ret;
struct WalkStackData *data = (WalkStackData *)msg.lParam;
// Don't suspend the calling thread until it's waiting for
// us; otherwise the number of frames on the stack could vary.
ret = ::WaitForSingleObject(data->eventStart, INFINITE);
if (ret != WAIT_OBJECT_0)
PrintError("WaitForSingleObject");
// Suspend the calling thread, dump his stack, and then resume him.
// He's currently waiting for us to finish so now should be a good time.
ret = ::SuspendThread( data->thread );
if (ret == -1) {
PrintError("ThreadSuspend");
}
else {
if (_StackWalk64)
WalkStackMain64(data);
else
WalkStackMain(data);
ret = ::ResumeThread(data->thread);
if (ret == -1) {
PrintError("ThreadResume");
}
}
::SetEvent(data->eventEnd);
}
}
return 0;
}
/**
* Walk the stack, translating PC's found into strings and recording the
* chain in aBuffer. For this to work properly, the DLLs must be rebased
* so that the address in the file agrees with the address in memory.
* Otherwise StackWalk will return FALSE when it hits a frame in a DLL
* whose in memory address doesn't match its in-file address.
*/
EXPORT_XPCOM_API(nsresult)
NS_StackWalk(NS_WalkStackCallback aCallback, PRUint32 aSkipFrames,
void *aClosure)
{
HANDLE myProcess, myThread;
DWORD walkerReturn;
struct WalkStackData data;
if (!EnsureImageHlpInitialized())
return PR_FALSE;
// Have to duplicate handle to get a real handle.
if (!::DuplicateHandle(::GetCurrentProcess(),
::GetCurrentProcess(),
::GetCurrentProcess(),
&myProcess,
PROCESS_ALL_ACCESS, FALSE, 0)) {
PrintError("DuplicateHandle (process)");
return NS_ERROR_FAILURE;
}
if (!::DuplicateHandle(::GetCurrentProcess(),
::GetCurrentThread(),
::GetCurrentProcess(),
&myThread,
THREAD_ALL_ACCESS, FALSE, 0)) {
PrintError("DuplicateHandle (thread)");
::CloseHandle(myProcess);
return NS_ERROR_FAILURE;
}
data.skipFrames = aSkipFrames;
data.thread = myThread;
data.process = myProcess;
data.eventStart = ::CreateEvent(NULL, FALSE /* auto-reset*/,
FALSE /* initially non-signaled */, NULL);
data.eventEnd = ::CreateEvent(NULL, FALSE /* auto-reset*/,
FALSE /* initially non-signaled */, NULL);
void *local_pcs[1024];
data.pcs = local_pcs;
data.pc_count = 0;
data.pc_size = NS_ARRAY_LENGTH(local_pcs);
::PostThreadMessage(gStackWalkThread, WM_USER, 0, (LPARAM)&data);
walkerReturn = ::SignalObjectAndWait(data.eventStart,
data.eventEnd, INFINITE, FALSE);
if (walkerReturn != WAIT_OBJECT_0)
PrintError("SignalObjectAndWait (1)");
if (data.pc_count > data.pc_size) {
data.pcs = (void**) malloc(data.pc_count * sizeof(void*));
data.pc_size = data.pc_count;
data.pc_count = 0;
::PostThreadMessage(gStackWalkThread, WM_USER, 0, (LPARAM)&data);
walkerReturn = ::SignalObjectAndWait(data.eventStart,
data.eventEnd, INFINITE, FALSE);
if (walkerReturn != WAIT_OBJECT_0)
PrintError("SignalObjectAndWait (2)");
}
::CloseHandle(myThread);
::CloseHandle(myProcess);
::CloseHandle(data.eventStart);
::CloseHandle(data.eventEnd);
for (PRUint32 i = 0; i < data.pc_count; ++i)
(*aCallback)(data.pcs[i], aClosure);
if (data.pc_size > NS_ARRAY_LENGTH(local_pcs))
free(data.pcs);
return NS_OK;
}
static BOOL CALLBACK callbackEspecial(
PCSTR aModuleName,
ULONG aModuleBase,
ULONG aModuleSize,
PVOID aUserContext)
{
BOOL retval = TRUE;
DWORD addr = *(DWORD*)aUserContext;
/*
* You'll want to control this if we are running on an
* architecture where the addresses go the other direction.
* Not sure this is even a realistic consideration.
*/
const BOOL addressIncreases = TRUE;
/*
* If it falls inside the known range, load the symbols.
*/
if (addressIncreases
? (addr >= aModuleBase && addr <= (aModuleBase + aModuleSize))
: (addr <= aModuleBase && addr >= (aModuleBase - aModuleSize))
) {
retval = _SymLoadModule(GetCurrentProcess(), NULL, (PSTR)aModuleName, NULL, aModuleBase, aModuleSize);
if (!retval)
PrintError("SymLoadModule");
}
return retval;
}
static BOOL CALLBACK callbackEspecial64(
PCSTR aModuleName,
DWORD64 aModuleBase,
ULONG aModuleSize,
PVOID aUserContext)
{
#ifdef USING_WXP_VERSION
BOOL retval = TRUE;
DWORD64 addr = *(DWORD64*)aUserContext;
/*
* You'll want to control this if we are running on an
* architecture where the addresses go the other direction.
* Not sure this is even a realistic consideration.
*/
const BOOL addressIncreases = TRUE;
/*
* If it falls in side the known range, load the symbols.
*/
if (addressIncreases
? (addr >= aModuleBase && addr <= (aModuleBase + aModuleSize))
: (addr <= aModuleBase && addr >= (aModuleBase - aModuleSize))
) {
retval = _SymLoadModule64(GetCurrentProcess(), NULL, (PSTR)aModuleName, NULL, aModuleBase, aModuleSize);
if (!retval)
PrintError("SymLoadModule64");
}
return retval;
#else
return FALSE;
#endif
}
/*
* SymGetModuleInfoEspecial
*
* Attempt to determine the module information.
* Bug 112196 says this DLL may not have been loaded at the time
* SymInitialize was called, and thus the module information
* and symbol information is not available.
* This code rectifies that problem.
*/
BOOL SymGetModuleInfoEspecial(HANDLE aProcess, DWORD aAddr, PIMAGEHLP_MODULE aModuleInfo, PIMAGEHLP_LINE aLineInfo)
{
BOOL retval = FALSE;
/*
* Init the vars if we have em.
*/
aModuleInfo->SizeOfStruct = sizeof(IMAGEHLP_MODULE);
if (nsnull != aLineInfo) {
aLineInfo->SizeOfStruct = sizeof(IMAGEHLP_LINE);
}
/*
* Give it a go.
* It may already be loaded.
*/
retval = _SymGetModuleInfo(aProcess, aAddr, aModuleInfo);
if (FALSE == retval) {
BOOL enumRes = FALSE;
/*
* Not loaded, here's the magic.
* Go through all the modules.
*/
// Need to cast to PENUMLOADED_MODULES_CALLBACK because the
// constness of the first parameter of
// PENUMLOADED_MODULES_CALLBACK varies over SDK versions (from
// non-const to const over time). See bug 391848 and bug
// 415426.
enumRes = _EnumerateLoadedModules(aProcess, (PENUMLOADED_MODULES_CALLBACK)callbackEspecial, (PVOID)&aAddr);
if (FALSE != enumRes)
{
/*
* One final go.
* If it fails, then well, we have other problems.
*/
retval = _SymGetModuleInfo(aProcess, aAddr, aModuleInfo);
if (!retval)
PrintError("SymGetModuleInfo");
}
}
/*
* If we got module info, we may attempt line info as well.
* We will not report failure if this does not work.
*/
if (FALSE != retval && nsnull != aLineInfo && nsnull != _SymGetLineFromAddr) {
DWORD displacement = 0;
BOOL lineRes = FALSE;
lineRes = _SymGetLineFromAddr(aProcess, aAddr, &displacement, aLineInfo);
}
return retval;
}
// New members were added to IMAGEHLP_MODULE64 (that show up in the
// Platform SDK that ships with VC8, but not the Platform SDK that ships
// with VC7.1, i.e., between DbgHelp 6.0 and 6.1), but we don't need to
// use them, and it's useful to be able to function correctly with the
// older library. (Stock Windows XP SP2 seems to ship with dbghelp.dll
// version 5.1.) Since Platform SDK version need not correspond to
// compiler version, and the version number in debughlp.h was NOT bumped
// when these changes were made, ifdef based on a constant that was
// added between these versions.
#ifdef SSRVOPT_SETCONTEXT
#define NS_IMAGEHLP_MODULE64_SIZE (((offsetof(IMAGEHLP_MODULE64, LoadedPdbName) + sizeof(DWORD64) - 1) / sizeof(DWORD64)) * sizeof(DWORD64))
#else
#define NS_IMAGEHLP_MODULE64_SIZE sizeof(IMAGEHLP_MODULE64)
#endif
#ifdef USING_WXP_VERSION
BOOL SymGetModuleInfoEspecial64(HANDLE aProcess, DWORD64 aAddr, PIMAGEHLP_MODULE64 aModuleInfo, PIMAGEHLP_LINE64 aLineInfo)
{
BOOL retval = FALSE;
/*
* Init the vars if we have em.
*/
aModuleInfo->SizeOfStruct = NS_IMAGEHLP_MODULE64_SIZE;
if (nsnull != aLineInfo) {
aLineInfo->SizeOfStruct = sizeof(IMAGEHLP_LINE64);
}
/*
* Give it a go.
* It may already be loaded.
*/
retval = _SymGetModuleInfo64(aProcess, aAddr, aModuleInfo);
if (FALSE == retval) {
BOOL enumRes = FALSE;
/*
* Not loaded, here's the magic.
* Go through all the modules.
*/
// Need to cast to PENUMLOADED_MODULES_CALLBACK64 because the
// constness of the first parameter of
// PENUMLOADED_MODULES_CALLBACK64 varies over SDK versions (from
// non-const to const over time). See bug 391848 and bug
// 415426.
enumRes = _EnumerateLoadedModules64(aProcess, (PENUMLOADED_MODULES_CALLBACK64)callbackEspecial64, (PVOID)&aAddr);
if (FALSE != enumRes)
{
/*
* One final go.
* If it fails, then well, we have other problems.
*/
retval = _SymGetModuleInfo64(aProcess, aAddr, aModuleInfo);
if (!retval)
PrintError("SymGetModuleInfo64");
}
}
/*
* If we got module info, we may attempt line info as well.
* We will not report failure if this does not work.
*/
if (FALSE != retval && nsnull != aLineInfo && nsnull != _SymGetLineFromAddr64) {
DWORD displacement = 0;
BOOL lineRes = FALSE;
lineRes = _SymGetLineFromAddr64(aProcess, aAddr, &displacement, aLineInfo);
if (!lineRes) {
// Clear out aLineInfo to indicate that it's not valid
memset(aLineInfo, 0, sizeof(*aLineInfo));
}
}
return retval;
}
#endif
HANDLE
GetCurrentPIDorHandle()
{
if (_SymGetModuleBase64)
return GetCurrentProcess(); // winxp and friends use process handle
return (HANDLE) GetCurrentProcessId(); // winme win98 win95 etc use process identifier
}
PRBool
EnsureSymInitialized()
{
static PRBool gInitialized = PR_FALSE;
PRBool retStat;
if (gInitialized)
return gInitialized;
if (!EnsureImageHlpInitialized())
return PR_FALSE;
_SymSetOptions(SYMOPT_LOAD_LINES | SYMOPT_UNDNAME);
retStat = _SymInitialize(GetCurrentPIDorHandle(), NULL, TRUE);
if (!retStat)
PrintError("SymInitialize");
gInitialized = retStat;
/* XXX At some point we need to arrange to call _SymCleanup */
return retStat;
}
EXPORT_XPCOM_API(nsresult)
NS_DescribeCodeAddress(void *aPC, nsCodeAddressDetails *aDetails)
{
aDetails->library[0] = '\0';
aDetails->loffset = 0;
aDetails->filename[0] = '\0';
aDetails->lineno = 0;
aDetails->function[0] = '\0';
aDetails->foffset = 0;
if (!EnsureSymInitialized())
return NS_ERROR_FAILURE;
HANDLE myProcess = ::GetCurrentProcess();
BOOL ok;
// debug routines are not threadsafe, so grab the lock.
EnterCriticalSection(&gDbgHelpCS);
#ifdef USING_WXP_VERSION
if (_StackWalk64) {
//
// Attempt to load module info before we attempt to resolve the symbol.
// This just makes sure we get good info if available.
//
DWORD64 addr = (DWORD64)aPC;
IMAGEHLP_MODULE64 modInfo;
IMAGEHLP_LINE64 lineInfo;
BOOL modInfoRes;
modInfoRes = SymGetModuleInfoEspecial64(myProcess, addr, &modInfo, &lineInfo);
if (modInfoRes) {
PL_strncpyz(aDetails->library, modInfo.ModuleName,
sizeof(aDetails->library));
aDetails->loffset = (char*) aPC - (char*) modInfo.BaseOfImage;
if (lineInfo.FileName) {
PL_strncpyz(aDetails->filename, lineInfo.FileName,
sizeof(aDetails->filename));
aDetails->lineno = lineInfo.LineNumber;
}
}
ULONG64 buffer[(sizeof(SYMBOL_INFO) +
MAX_SYM_NAME*sizeof(TCHAR) + sizeof(ULONG64) - 1) / sizeof(ULONG64)];
PSYMBOL_INFO pSymbol = (PSYMBOL_INFO)buffer;
pSymbol->SizeOfStruct = sizeof(SYMBOL_INFO);
pSymbol->MaxNameLen = MAX_SYM_NAME;
DWORD64 displacement;
ok = _SymFromAddr && _SymFromAddr(myProcess, addr, &displacement, pSymbol);
if (ok) {
PL_strncpyz(aDetails->function, pSymbol->Name,
sizeof(aDetails->function));
aDetails->foffset = displacement;
}
} else
#endif
{
//
// Attempt to load module info before we attempt to resolve the symbol.
// This just makes sure we get good info if available.
//
DWORD addr = (DWORD)aPC;
IMAGEHLP_MODULE modInfo;
IMAGEHLP_LINE lineInfo;
BOOL modInfoRes;
modInfoRes = SymGetModuleInfoEspecial(myProcess, addr, &modInfo, &lineInfo);
if (modInfoRes) {
PL_strncpyz(aDetails->library, modInfo.ModuleName,
sizeof(aDetails->library));
aDetails->loffset = (char*) aPC - (char*) modInfo.BaseOfImage;
PL_strncpyz(aDetails->filename, lineInfo.FileName,
sizeof(aDetails->filename));
aDetails->lineno = lineInfo.LineNumber;
}
#ifdef USING_WXP_VERSION
ULONG64 buffer[(sizeof(SYMBOL_INFO) +
MAX_SYM_NAME*sizeof(TCHAR) + sizeof(ULONG64) - 1) / sizeof(ULONG64)];
PSYMBOL_INFO pSymbol = (PSYMBOL_INFO)buffer;
pSymbol->SizeOfStruct = sizeof(SYMBOL_INFO);
pSymbol->MaxNameLen = MAX_SYM_NAME;
DWORD64 displacement;
ok = _SymFromAddr && _SymFromAddr(myProcess, addr, &displacement, pSymbol);
#else
char buf[sizeof(IMAGEHLP_SYMBOL) + 512];
PIMAGEHLP_SYMBOL pSymbol = (PIMAGEHLP_SYMBOL) buf;
pSymbol->SizeOfStruct = sizeof(buf);
pSymbol->MaxNameLength = 512;
DWORD displacement;
ok = _SymGetSymFromAddr(myProcess,
frame.AddrPC.Offset,
&displacement,
pSymbol);
#endif
if (ok) {
PL_strncpyz(aDetails->function, pSymbol->Name,
sizeof(aDetails->function));
aDetails->foffset = displacement;
}
}
LeaveCriticalSection(&gDbgHelpCS); // release our lock
return NS_OK;
}
EXPORT_XPCOM_API(nsresult)
NS_FormatCodeAddressDetails(void *aPC, const nsCodeAddressDetails *aDetails,
char *aBuffer, PRUint32 aBufferSize)
{
#ifdef USING_WXP_VERSION
if (_StackWalk64) {
if (aDetails->function[0])
_snprintf(aBuffer, aBufferSize, "%s!%s+0x%016lX",
aDetails->library, aDetails->function, aDetails->foffset);
else
_snprintf(aBuffer, aBufferSize, "0x%016lX", aPC);
} else {
#endif
if (aDetails->function[0])
_snprintf(aBuffer, aBufferSize, "%s!%s+0x%08lX",
aDetails->library, aDetails->function, aDetails->foffset);
else
_snprintf(aBuffer, aBufferSize, "0x%08lX", aPC);
#ifdef USING_WXP_VERSION
}
#endif
aBuffer[aBufferSize - 1] = '\0';
PRUint32 len = strlen(aBuffer);
if (aDetails->filename[0]) {
_snprintf(aBuffer + len, aBufferSize - len, " (%s, line %d)\n",
aDetails->filename, aDetails->lineno);
} else {
aBuffer[len] = '\n';
if (++len != aBufferSize)
aBuffer[len] = '\0';
}
aBuffer[aBufferSize - 2] = '\n';
aBuffer[aBufferSize - 1] = '\0';
return NS_OK;
}
// WIN32 x86 stack walking code
// i386 or PPC Linux stackwalking code or Solaris
#elif HAVE_DLADDR && (HAVE__UNWIND_BACKTRACE || (defined(linux) && defined(__GNUC__) && (defined(__i386) || defined(PPC))) || (defined(__sun) && (defined(__sparc) || defined(sparc) || defined(__i386) || defined(i386))) || (defined(XP_MACOSX) && (defined(__ppc__) || defined(__i386))))
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "nscore.h"
#include <stdio.h>
#include "plstr.h"
// On glibc 2.1, the Dl_info api defined in <dlfcn.h> is only exposed
// if __USE_GNU is defined. I suppose its some kind of standards
// adherence thing.
//
#if (__GLIBC_MINOR__ >= 1) && !defined(__USE_GNU)
#define __USE_GNU
#endif
#if defined(HAVE_LIBDL) || defined(XP_MACOSX)
#include <dlfcn.h>
#endif
// This thing is exported by libstdc++
// Yes, this is a gcc only hack
#if defined(MOZ_DEMANGLE_SYMBOLS)
#include <cxxabi.h>
#include <stdlib.h> // for free()
#endif // MOZ_DEMANGLE_SYMBOLS
void DemangleSymbol(const char * aSymbol,
char * aBuffer,
int aBufLen)
{
aBuffer[0] = '\0';
#if defined(MOZ_DEMANGLE_SYMBOLS)
/* See demangle.h in the gcc source for the voodoo */
char * demangled = abi::__cxa_demangle(aSymbol,0,0,0);
if (demangled)
{
strncpy(aBuffer,demangled,aBufLen);
free(demangled);
}
#endif // MOZ_DEMANGLE_SYMBOLS
}
#if defined(__sun) && (defined(__sparc) || defined(sparc) || defined(__i386) || defined(i386))
/*
* Stack walking code for Solaris courtesy of Bart Smaalder's "memtrak".
*/
#include <synch.h>
#include <ucontext.h>
#include <sys/frame.h>
#include <sys/regset.h>
#include <sys/stack.h>
static int load_address ( void * pc, void * arg );
static struct bucket * newbucket ( void * pc );
static struct frame * cs_getmyframeptr ( void );
static void cs_walk_stack ( void * (*read_func)(char * address),
struct frame * fp,
int (*operate_func)(void *, void *),
void * usrarg );
static void cs_operate ( void (*operate_func)(void *, void *),
void * usrarg );
#ifndef STACK_BIAS
#define STACK_BIAS 0
#endif /*STACK_BIAS*/
#define LOGSIZE 4096
/* type of demangling function */
typedef int demf_t(const char *, char *, size_t);
static demf_t *demf;
static int initialized = 0;
#if defined(sparc) || defined(__sparc)
#define FRAME_PTR_REGISTER REG_SP
#endif
#if defined(i386) || defined(__i386)
#define FRAME_PTR_REGISTER EBP
#endif
struct bucket {
void * pc;
int index;
struct bucket * next;
};
struct my_user_args {
NS_WalkStackCallback callback;
PRUint32 skipFrames;
void *closure;
};
static void myinit();
#pragma init (myinit)
static void
myinit()
{
if (! initialized) {
#ifndef __GNUC__
void *handle;
const char *libdem = "libdemangle.so.1";
/* load libdemangle if we can and need to (only try this once) */
if ((handle = dlopen(libdem, RTLD_LAZY)) != NULL) {
demf = (demf_t *)dlsym(handle,
"cplus_demangle"); /*lint !e611 */
/*
* lint override above is to prevent lint from
* complaining about "suspicious cast".
*/
}
#endif /*__GNUC__*/
}
initialized = 1;
}
static int
load_address(void * pc, void * arg )
{
static struct bucket table[2048];
static mutex_t lock;
struct bucket * ptr;
struct my_user_args * args = (struct my_user_args *) arg;
unsigned int val = NS_PTR_TO_INT32(pc);
ptr = table + ((val >> 2)&2047);
mutex_lock(&lock);
while (ptr->next) {
if (ptr->next->pc == pc)
break;
ptr = ptr->next;
}
if (ptr->next) {
mutex_unlock(&lock);
} else {
(args->callback)(pc, args->closure);
ptr->next = newbucket(pc);
mutex_unlock(&lock);
}
return 0;
}
static struct bucket *
newbucket(void * pc)
{
struct bucket * ptr = (struct bucket *) malloc(sizeof (*ptr));
static int index; /* protected by lock in caller */
ptr->index = index++;
ptr->next = NULL;
ptr->pc = pc;
return (ptr);
}
static struct frame *
csgetframeptr()
{
ucontext_t u;
struct frame *fp;
(void) getcontext(&u);
fp = (struct frame *)
((char *)u.uc_mcontext.gregs[FRAME_PTR_REGISTER] +
STACK_BIAS);
/* make sure to return parents frame pointer.... */
return ((struct frame *)((ulong_t)fp->fr_savfp + STACK_BIAS));
}
static void
cswalkstack(struct frame *fp, int (*operate_func)(void *, void *),
void *usrarg)
{
while (fp != 0 && fp->fr_savpc != 0) {
if (operate_func((void *)fp->fr_savpc, usrarg) != 0)
break;
/*
* watch out - libthread stacks look funny at the top
* so they may not have their STACK_BIAS set
*/
fp = (struct frame *)((ulong_t)fp->fr_savfp +
(fp->fr_savfp?(ulong_t)STACK_BIAS:0));
}
}
static void
cs_operate(int (*operate_func)(void *, void *), void * usrarg)
{
cswalkstack(csgetframeptr(), operate_func, usrarg);
}
EXPORT_XPCOM_API(nsresult)
NS_StackWalk(NS_WalkStackCallback aCallback, PRUint32 aSkipFrames,
void *aClosure)
{
struct my_user_args args;
if (!initialized)
myinit();
args.callback = aCallback;
args.skipFrames = aSkipFrames; /* XXX Not handled! */
args.closure = aClosure;
cs_operate(load_address, &args);
return NS_OK;
}
EXPORT_XPCOM_API(nsresult)
NS_DescribeCodeAddress(void *aPC, nsCodeAddressDetails *aDetails)
{
aDetails->library[0] = '\0';
aDetails->loffset = 0;
aDetails->filename[0] = '\0';
aDetails->lineno = 0;
aDetails->function[0] = '\0';
aDetails->foffset = 0;
char dembuff[4096];
Dl_info info;
if (dladdr(aPC, & info)) {
if (info.dli_fname) {
PL_strncpyz(aDetails->library, info.dli_fname,
sizeof(aDetails->library));
aDetails->loffset = (char*)aPC - (char*)info.dli_fbase;
}
if (info.dli_sname) {
aDetails->foffset = (char*)aPC - (char*)info.dli_saddr;
#ifdef __GNUC__
DemangleSymbol(info.dli_sname, dembuff, sizeof(dembuff));
#else
if (!demf || demf(info.dli_sname, dembuff, sizeof (dembuff)))
dembuff[0] = 0;
#endif /*__GNUC__*/
PL_strncpyz(aDetails->function,
(dembuff[0] != '\0') ? dembuff : info.dli_sname,
sizeof(aDetails->function));
}
}
return NS_OK;
}
EXPORT_XPCOM_API(nsresult)
NS_FormatCodeAddressDetails(void *aPC, const nsCodeAddressDetails *aDetails,
char *aBuffer, PRUint32 aBufferSize)
{
snprintf(aBuffer, aBufferSize, "%p %s:%s+0x%lx\n",
aPC,
aDetails->library[0] ? aDetails->library : "??",
aDetails->function[0] ? aDetails->function : "??",
aDetails->foffset);
return NS_OK;
}
#else // not __sun-specific
#if (defined(linux) && defined(__GNUC__) && (defined(__i386) || defined(PPC))) || (defined(XP_MACOSX) && (defined(__i386) || defined(__ppc__))) // i386 or PPC Linux or Mac stackwalking code
#if __GLIBC__ > 2 || __GLIBC_MINOR > 1
#define HAVE___LIBC_STACK_END 1
#else
#define HAVE___LIBC_STACK_END 0
#endif
#if HAVE___LIBC_STACK_END
extern void *__libc_stack_end; // from ld-linux.so
#endif
EXPORT_XPCOM_API(nsresult)
NS_StackWalk(NS_WalkStackCallback aCallback, PRUint32 aSkipFrames,
void *aClosure)
{
// Stack walking code courtesy Kipp's "leaky".
// Get the frame pointer
void **bp;
#if defined(__i386)
__asm__( "movl %%ebp, %0" : "=g"(bp));
#else
// It would be nice if this worked uniformly, but at least on i386 and
// x86_64, it stopped working with gcc 4.1, because it points to the
// end of the saved registers instead of the start.
bp = (void**) __builtin_frame_address(0);
#endif
int skip = aSkipFrames;
while (1) {
void **next = (void**)*bp;
// bp may not be a frame pointer on i386 if code was compiled with
// -fomit-frame-pointer, so do some sanity checks.
// (bp should be a frame pointer on ppc(64) but checking anyway may help
// a little if the stack has been corrupted.)
if (next <= bp ||
#if HAVE___LIBC_STACK_END
next > __libc_stack_end ||
#endif
(long(next) & 3)) {
break;
}
#if (defined(__ppc__) && defined(XP_MACOSX)) || defined(__powerpc64__)
// ppc mac or powerpc64 linux
void *pc = *(bp+2);
#else // i386 or powerpc32 linux
void *pc = *(bp+1);
#endif
if (--skip < 0) {
(*aCallback)(pc, aClosure);
}
bp = next;
}
return NS_OK;
}
#elif defined(HAVE__UNWIND_BACKTRACE)
// libgcc_s.so symbols _Unwind_Backtrace@@GCC_3.3 and _Unwind_GetIP@@GCC_3.0
#include <unwind.h>
struct unwind_info {
NS_WalkStackCallback callback;
int skip;
void *closure;
};
static _Unwind_Reason_Code
unwind_callback (struct _Unwind_Context *context, void *closure)
{
unwind_info *info = static_cast<unwind_info *>(closure);
if (--info->skip < 0) {
void *pc = reinterpret_cast<void *>(_Unwind_GetIP(context));
(*info->callback)(pc, info->closure);
}
return _URC_NO_REASON;
}
EXPORT_XPCOM_API(nsresult)
NS_StackWalk(NS_WalkStackCallback aCallback, PRUint32 aSkipFrames,
void *aClosure)
{
unwind_info info;
info.callback = aCallback;
info.skip = aSkipFrames + 1;
info.closure = aClosure;
_Unwind_Backtrace(unwind_callback, &info);
return NS_OK;
}
#endif
EXPORT_XPCOM_API(nsresult)
NS_DescribeCodeAddress(void *aPC, nsCodeAddressDetails *aDetails)
{
aDetails->library[0] = '\0';
aDetails->loffset = 0;
aDetails->filename[0] = '\0';
aDetails->lineno = 0;
aDetails->function[0] = '\0';
aDetails->foffset = 0;
Dl_info info;
int ok = dladdr(aPC, &info);
if (!ok) {
return NS_OK;
}
PL_strncpyz(aDetails->library, info.dli_fname, sizeof(aDetails->library));
aDetails->loffset = (char*)aPC - (char*)info.dli_fbase;
const char * symbol = info.dli_sname;
int len;
if (!symbol || !(len = strlen(symbol))) {
return NS_OK;
}
char demangled[4096] = "\0";
DemangleSymbol(symbol, demangled, sizeof(demangled));
if (strlen(demangled)) {
symbol = demangled;
len = strlen(symbol);
}
PL_strncpyz(aDetails->function, symbol, sizeof(aDetails->function));
aDetails->foffset = (char*)aPC - (char*)info.dli_saddr;
return NS_OK;
}
EXPORT_XPCOM_API(nsresult)
NS_FormatCodeAddressDetails(void *aPC, const nsCodeAddressDetails *aDetails,
char *aBuffer, PRUint32 aBufferSize)
{
if (!aDetails->library[0]) {
snprintf(aBuffer, aBufferSize, "UNKNOWN %p\n", aPC);
} else if (!aDetails->function[0]) {
snprintf(aBuffer, aBufferSize, "UNKNOWN [%s +0x%08lX]\n",
aDetails->library, aDetails->loffset);
} else {
snprintf(aBuffer, aBufferSize, "%s+0x%08lX [%s +0x%08lX]\n",
aDetails->function, aDetails->foffset,
aDetails->library, aDetails->loffset);
}
return NS_OK;
}
#endif
#else // unsupported platform.
EXPORT_XPCOM_API(nsresult)
NS_StackWalk(NS_WalkStackCallback aCallback, PRUint32 aSkipFrames,
void *aClosure)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
EXPORT_XPCOM_API(nsresult)
NS_DescribeCodeAddress(void *aPC, nsCodeAddressDetails *aDetails)
{
aDetails->library[0] = '\0';
aDetails->loffset = 0;
aDetails->filename[0] = '\0';
aDetails->lineno = 0;
aDetails->function[0] = '\0';
aDetails->foffset = 0;
return NS_ERROR_NOT_IMPLEMENTED;
}
EXPORT_XPCOM_API(nsresult)
NS_FormatCodeAddressDetails(void *aPC, const nsCodeAddressDetails *aDetails,
char *aBuffer, PRUint32 aBufferSize)
{
aBuffer[0] = '\0';
return NS_ERROR_NOT_IMPLEMENTED;
}
#endif
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