#include "u_debug_symbol.h"
#include "u_hash_table.h"
-#if defined(PIPE_OS_WINDOWS) && defined(PIPE_ARCH_X86)
+
+#if defined(PIPE_OS_WINDOWS)
#include <windows.h>
#include <stddef.h>
#include "dbghelp.h"
-static BOOL bSymInitialized = FALSE;
-
-static HMODULE hModule_Dbghelp = NULL;
+/**
+ * SymInitialize() must be called once for each process (in this case, the
+ * current process), before any of the other functions can be called.
+ */
+static BOOL g_bSymInitialized = FALSE;
-static
-FARPROC WINAPI __GetProcAddress(LPCSTR lpProcName)
+/**
+ * Lookup the address of a DbgHelp function.
+ */
+static FARPROC WINAPI
+getDbgHelpProcAddress(LPCSTR lpProcName)
{
+ static HMODULE hModule = NULL;
+
+ if (!hModule) {
+ static boolean bail = FALSE;
+
+ if (bail) {
+ return NULL;
+ }
+
#ifdef PIPE_CC_GCC
- if (!hModule_Dbghelp) {
/*
- * bfdhelp.dll is a dbghelp.dll look-alike replacement, which is able to
- * understand MinGW symbols using BFD library. It is available from
+ * DbgHelp does not understand the debug information generated by MinGW toolchain.
+ *
+ * mgwhelp.dll is a dbghelp.dll look-alike replacement, which is able to
+ * understand MinGW symbols, including on 64-bit builds.
+ */
+ if (!hModule) {
+ hModule = LoadLibraryA("mgwhelp.dll");
+ if (!hModule) {
+ _debug_printf("warning: mgwhelp.dll not found: symbol names will not be resolved\n"
+ "warning: download it from http://code.google.com/p/jrfonseca/wiki/DrMingw#MgwHelp\n");
+ }
+ }
+
+ /*
+ * bfdhelp.dll was the predecessor of mgwhelp.dll. It is available from
* http://people.freedesktop.org/~jrfonseca/bfdhelp/ for now.
*/
- hModule_Dbghelp = LoadLibraryA("bfdhelp.dll");
- }
-#endif
+ if (!hModule) {
+ hModule = LoadLibraryA("bfdhelp.dll");
+ }
+ #endif
- if (!hModule_Dbghelp) {
- hModule_Dbghelp = LoadLibraryA("dbghelp.dll");
- if (!hModule_Dbghelp) {
+ /*
+ * Fallback to the real DbgHelp.
+ */
+ if (!hModule) {
+ hModule = LoadLibraryA("dbghelp.dll");
+ }
+
+ if (!hModule) {
+ bail = TRUE;
return NULL;
}
}
- return GetProcAddress(hModule_Dbghelp, lpProcName);
+ return GetProcAddress(hModule, lpProcName);
}
-typedef BOOL (WINAPI *PFNSYMINITIALIZE)(HANDLE, LPSTR, BOOL);
-static PFNSYMINITIALIZE pfnSymInitialize = NULL;
+/**
+ * Generic macro to dispatch a DbgHelp functions.
+ */
+#define DBGHELP_DISPATCH(_name, _ret_type, _ret_default, _arg_types, _arg_names) \
+ static _ret_type WINAPI \
+ j_##_name _arg_types \
+ { \
+ typedef BOOL (WINAPI *PFN) _arg_types; \
+ static PFN pfn = NULL; \
+ if (!pfn) { \
+ pfn = (PFN) getDbgHelpProcAddress(#_name); \
+ if (!pfn) { \
+ return _ret_default; \
+ } \
+ } \
+ return pfn _arg_names; \
+ }
-static
-BOOL WINAPI j_SymInitialize(HANDLE hProcess, PSTR UserSearchPath, BOOL fInvadeProcess)
-{
- if(
- (pfnSymInitialize || (pfnSymInitialize = (PFNSYMINITIALIZE) __GetProcAddress("SymInitialize")))
- )
- return pfnSymInitialize(hProcess, UserSearchPath, fInvadeProcess);
- else
- return FALSE;
-}
+DBGHELP_DISPATCH(SymInitialize,
+ BOOL, 0,
+ (HANDLE hProcess, PSTR UserSearchPath, BOOL fInvadeProcess),
+ (hProcess, UserSearchPath, fInvadeProcess))
-typedef DWORD (WINAPI *PFNSYMSETOPTIONS)(DWORD);
-static PFNSYMSETOPTIONS pfnSymSetOptions = NULL;
+DBGHELP_DISPATCH(SymSetOptions,
+ DWORD, FALSE,
+ (DWORD SymOptions),
+ (SymOptions))
-static
-DWORD WINAPI j_SymSetOptions(DWORD SymOptions)
-{
- if(
- (pfnSymSetOptions || (pfnSymSetOptions = (PFNSYMSETOPTIONS) __GetProcAddress("SymSetOptions")))
- )
- return pfnSymSetOptions(SymOptions);
- else
- return FALSE;
-}
+DBGHELP_DISPATCH(SymFromAddr,
+ BOOL, FALSE,
+ (HANDLE hProcess, DWORD64 Address, PDWORD64 Displacement, PSYMBOL_INFO Symbol),
+ (hProcess, Address, Displacement, Symbol))
-typedef BOOL (WINAPI *PFNSYMGETSYMFROMADDR)(HANDLE, DWORD64, PDWORD64, PSYMBOL_INFO);
-static PFNSYMGETSYMFROMADDR pfnSymFromAddr = NULL;
+DBGHELP_DISPATCH(SymGetLineFromAddr64,
+ BOOL, FALSE,
+ (HANDLE hProcess, DWORD64 dwAddr, PDWORD pdwDisplacement, PIMAGEHLP_LINE64 Line),
+ (hProcess, dwAddr, pdwDisplacement, Line))
-static
-BOOL WINAPI j_SymFromAddr(HANDLE hProcess, DWORD64 Address, PDWORD64 Displacement, PSYMBOL_INFO Symbol)
-{
- if(
- (pfnSymFromAddr || (pfnSymFromAddr = (PFNSYMGETSYMFROMADDR) __GetProcAddress("SymFromAddr")))
- )
- return pfnSymFromAddr(hProcess, Address, Displacement, Symbol);
- else
- return FALSE;
-}
+
+#undef DBGHELP_DISPATCH
-static INLINE void
+static INLINE boolean
debug_symbol_name_dbghelp(const void *addr, char* buf, unsigned size)
{
- HANDLE hProcess;
- BYTE symbolBuffer[1024];
- PSYMBOL_INFO pSymbol = (PSYMBOL_INFO) symbolBuffer;
- DWORD64 dwDisplacement = 0; /* Displacement of the input address, relative to the start of the symbol */
+ DWORD64 dwAddr = (DWORD64)(uintptr_t)addr;
+ HANDLE hProcess = GetCurrentProcess();
- hProcess = GetCurrentProcess();
+ /* General purpose buffer, to back pSymbol and other temporary stuff.
+ * Must not be too memory hungry here to avoid stack overflows.
+ */
+ CHAR buffer[512];
+
+ PSYMBOL_INFO pSymbol = (PSYMBOL_INFO) buffer;
+ DWORD64 dwDisplacement = 0; /* Displacement of the input address, relative to the start of the symbol */
+ DWORD dwLineDisplacement = 0;
+ IMAGEHLP_LINE64 Line;
memset(pSymbol, 0, sizeof *pSymbol);
- pSymbol->SizeOfStruct = sizeof(symbolBuffer);
- pSymbol->MaxNameLen = sizeof(symbolBuffer) - offsetof(SYMBOL_INFO, Name);
+ pSymbol->SizeOfStruct = sizeof buffer;
+ pSymbol->MaxNameLen = sizeof buffer - offsetof(SYMBOL_INFO, Name);
- if(!bSymInitialized) {
+ if (!g_bSymInitialized) {
j_SymSetOptions(/* SYMOPT_UNDNAME | */ SYMOPT_LOAD_LINES);
- if(j_SymInitialize(hProcess, NULL, TRUE))
- bSymInitialized = TRUE;
+ if (j_SymInitialize(hProcess, NULL, TRUE)) {
+ g_bSymInitialized = TRUE;
+ }
}
- if(!j_SymFromAddr(hProcess, (DWORD64)(uintptr_t)addr, &dwDisplacement, pSymbol))
- buf[0] = 0;
- else
- {
- strncpy(buf, pSymbol->Name, size);
- buf[size - 1] = 0;
+ /* Lookup symbol name */
+ if (!g_bSymInitialized ||
+ !j_SymFromAddr(hProcess, dwAddr, &dwDisplacement, pSymbol)) {
+ /*
+ * We couldn't obtain symbol information. At least tell which module the address belongs.
+ */
+
+ HMODULE hModule = NULL;
+
+ if (!GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
+ (LPCTSTR)addr,
+ &hModule)) {
+ return FALSE;
+ }
+
+ if (GetModuleFileNameA(hModule, buffer, sizeof buffer) == sizeof buffer) {
+ return FALSE;
+ }
+ util_snprintf(buf, size, "%p at %s+0x%lx",
+ addr, buffer,
+ (unsigned long)((uintptr_t)addr - (uintptr_t)hModule));
+
+ return TRUE;
}
+
+ /*
+ * Try to get filename and line number.
+ */
+ memset(&Line, 0, sizeof Line);
+ Line.SizeOfStruct = sizeof Line;
+ if (!j_SymGetLineFromAddr64(hProcess, dwAddr, &dwLineDisplacement, &Line)) {
+ Line.FileName = NULL;
+ }
+
+ if (Line.FileName) {
+ util_snprintf(buf, size, "%s at %s:%lu", pSymbol->Name, Line.FileName, Line.LineNumber);
+ } else {
+ util_snprintf(buf, size, "%s", pSymbol->Name);
+ }
+
+ return TRUE;
}
-#endif
+
+#endif /* PIPE_OS_WINDOWS */
+
#if defined(__GLIBC__) && !defined(__UCLIBC__)
+
#include <execinfo.h>
/* This can only provide dynamic symbols, or binary offsets into a file.
*
* To fix this, post-process the output with tools/addr2line.sh
*/
-static INLINE void
+static INLINE boolean
debug_symbol_name_glibc(const void *addr, char* buf, unsigned size)
{
char** syms = backtrace_symbols((void**)&addr, 1);
+ if (!syms) {
+ return FALSE;
+ }
strncpy(buf, syms[0], size);
buf[size - 1] = 0;
free(syms);
+ return TRUE;
}
-#endif
+
+#endif /* defined(__GLIBC__) && !defined(__UCLIBC__) */
+
void
debug_symbol_name(const void *addr, char* buf, unsigned size)
{
-#if defined(PIPE_OS_WINDOWS) && defined(PIPE_ARCH_X86)
- debug_symbol_name_dbghelp(addr, buf, size);
- if(buf[0])
+#if defined(PIPE_OS_WINDOWS)
+ if (debug_symbol_name_dbghelp(addr, buf, size)) {
return;
+ }
#endif
#if defined(__GLIBC__) && !defined(__UCLIBC__)
- debug_symbol_name_glibc(addr, buf, size);
- if(buf[0])
- return;
+ if (debug_symbol_name_glibc(addr, buf, size)) {
+ return;
+ }
#endif
util_snprintf(buf, size, "%p", addr);
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