/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "windows.h"
#include "win_dbghelp.h"
#include <process.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
// Remove prefix addresses. 18 = 2 * (8 digit hexa + 1 space).
// e.g. "abcd1234 abcd1234 render_pdf!processInput
#define CDB_CALLSTACK_PREFIX (18)
// CDB.EXE prints a lot of garbage and there is no argument to pass which
// would remove all that noise.
// Using eval feature that evaluates a number in hex and prints it to stdout
// to mark where the callstack is printed.
// For example, each thread's callstack will be marked with "12340000" at
// the beginning and "12340001" at the end.
// We just made up these numbers; they could be anything, as long as they
// match up with their decimal equivalents.
#define MARKER_THREAD_CALLSTACK_START_NUMBER "12340000"
#define MARKER_THREAD_CALLSTACK_START "Evaluate expression: 305397760 = 12340000"
#define MARKER_THREAD_CALLSTACK_STOP_NUMBER "12340001"
#define MARKER_THREAD_CALLSTACK_STOP "Evaluate expression: 305397761 = 12340001"
#define MARKER_EXCEPTION_CALLSTACK_START_NUMBER "12340002"
#define MARKER_EXCEPTION_CALLSTACK_START "Evaluate expression: 305397762 = 12340002"
#define MARKER_EXCEPTION_CALLSTACK_STOP_NUMBER "12340003"
#define MARKER_EXCEPTION_CALLSTACK_STOP "Evaluate expression: 305397763 = 12340003"
// k - print stack
// ? val - evaluate expression. Used to mark the log file.
// .ecxr - load exception, if exception was thrown.
// k - print the resolved stack by .ecxr
// q - quit cdb.exe
#define CDB_PRINT_CALLSTACK_CURRENT_THREAD "? " MARKER_THREAD_CALLSTACK_START_NUMBER "; k; ? " MARKER_THREAD_CALLSTACK_STOP_NUMBER "; .ecxr; ? " MARKER_EXCEPTION_CALLSTACK_START_NUMBER "; k; ? " MARKER_EXCEPTION_CALLSTACK_STOP_NUMBER "; q"
static void strncpyOrSetBlank(char* dest, const char* src, size_t len) {
const char* srcOrEmptyString = (NULL == src) ? "" : src;
strncpy(dest, srcOrEmptyString, len);
}
char debug_app_name[MAX_PATH] = "";
void setAppName(const char* app_name) {
strncpyOrSetBlank(debug_app_name, app_name, sizeof(debug_app_name));
}
const char* getAppName() {
return debug_app_name;
}
char debug_binaries_path[MAX_PATH] = "";
void setBinariesPath(const char* binaries_path) {
strncpyOrSetBlank(debug_binaries_path, binaries_path,
sizeof(debug_binaries_path));
}
const char* getBinariesPath() {
return debug_binaries_path;
}
char debug_app_version[100] = "";
void setAppVersion(const char* version) {
strncpyOrSetBlank(debug_app_version, version, sizeof(debug_app_version));
}
const char* getAppVersion() {
return debug_app_version;
}
char debug_cdb_path[MAX_PATH] = "";
void setCdbPath(const char* path) {
strncpyOrSetBlank(debug_cdb_path, path, sizeof(debug_cdb_path));
}
const char* getCdbPath() {
return debug_cdb_path;
}
/** Print all the lines of a CDB k command whicha are callstacks.
* Callstack lines are marked by start and stop markers and they are prefixed
* byt 2 hex adresses, which will not be reported.
*/
static void printCallstack(const char* filename,
const char* start,
const char* stop) {
FILE* file = fopen(filename, "rt");
char line[1000];
bool started = false;
// Not the most performant code, but this will be used only to collect
// the callstack from a log files, only when the application had failed.
while (fgets(line, sizeof(line), file)) {
if (!started && strncmp(start, line, strlen(start)) == 0) {
started = true;
} else if (started && strncmp(stop, line, strlen(stop)) == 0) {
break;
} else if (started) {
// Filter messages. Calstack lines contain "exe/dll!function"
if (strchr(line, '!') != NULL && strlen(line) > CDB_CALLSTACK_PREFIX) {
printf("%s", line + CDB_CALLSTACK_PREFIX); // fgets includes \n already.
}
}
}
fclose(file);
}
#define BUILD_UNIQUE_FILENAME(var, ext, szPath, szAppName, szVersion, stLocalTime) \
sprintf(szFileName, "%s%s\\%s-%04d%02d%02d-%02d%02d%02d-%ld-%ld" ext, \
szPath, szAppName, szVersion, \
stLocalTime.wYear, stLocalTime.wMonth, stLocalTime.wDay, \
stLocalTime.wHour, stLocalTime.wMinute, stLocalTime.wSecond, \
GetCurrentProcessId(), GetCurrentThreadId());
// Exception execution handler. Exception is recognized. Transfer control to
// the exception handler by executing the __except compound statement,
// then continue execution after the __except block.
int GenerateDumpAndPrintCallstack(EXCEPTION_POINTERS* pExceptionPointers) {
BOOL bMiniDumpSuccessful;
char szPath[MAX_PATH];
char szFileName[MAX_PATH];
char szFileNameOutput[MAX_PATH];
const char* szAppName = getAppName();
const char* szVersion = getAppVersion();
DWORD dwBufferSize = MAX_PATH;
HANDLE hDumpFile;
SYSTEMTIME stLocalTime;
MINIDUMP_EXCEPTION_INFORMATION ExpParam;
GetLocalTime( &stLocalTime );
GetTempPath( dwBufferSize, szPath );
sprintf( szFileName, "%s%s", szPath, szAppName );
CreateDirectory( szFileName, NULL );
BUILD_UNIQUE_FILENAME(szFileName, ".dmp", szPath, szAppName, szVersion, stLocalTime);
BUILD_UNIQUE_FILENAME(szFileNameOutput, ".out", szPath, szAppName, szVersion, stLocalTime);
hDumpFile = CreateFile(szFileName,
GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_WRITE|FILE_SHARE_READ,
0,
CREATE_ALWAYS,
0,
0);
ExpParam.ThreadId = GetCurrentThreadId();
ExpParam.ExceptionPointers = pExceptionPointers;
ExpParam.ClientPointers = TRUE;
bMiniDumpSuccessful = MiniDumpWriteDump(GetCurrentProcess(),
GetCurrentProcessId(),
hDumpFile,
MiniDumpWithDataSegs,
&ExpParam,
NULL,
NULL);
printf("MiniDump file: %s\n", szFileName);
printf("App exe and pdb: %s\n", getBinariesPath());
const char* cdbExePath = getCdbPath();
if (cdbExePath && *cdbExePath != '\0') {
printf("Cdb exe: %s\n", cdbExePath);
char command[MAX_PATH * 4];
sprintf(command, "%s -y \"%s\" -i \"%s\" -z \"%s\" -c \"%s\" -kqm >\"%s\"",
cdbExePath,
getBinariesPath(),
getBinariesPath(),
szFileName,
CDB_PRINT_CALLSTACK_CURRENT_THREAD,
szFileNameOutput);
system(command);
printf("\nThread Callstack:\n");
printCallstack(szFileNameOutput,
MARKER_THREAD_CALLSTACK_START,
MARKER_THREAD_CALLSTACK_STOP);
printf("\nException Callstack:\n");
printCallstack(szFileNameOutput,
MARKER_EXCEPTION_CALLSTACK_START,
MARKER_EXCEPTION_CALLSTACK_STOP);
} else {
printf("Warning: CDB path not set up.\n");
}
return EXCEPTION_EXECUTE_HANDLER;
}
/** Sets the debugging variables. Input parameter is app location.
* e.g out\Debug\render_pdfs.exe
* This function expects the .pdb file to be in the same directory.
*/
void setUpDebuggingFromArgs(const char* vargs0) {
int i = strlen(vargs0);
if (i >= 4 && _stricmp(vargs0 - 4, ".exe") == 0) {
// Ignore .exe
i -= 4;
}
int pos_period = i;
// Find last \ in path - this is Windows!
while (i >= 0 && vargs0[i] != '\\') {
i--;
}
int pos_last_slash = i;
char app_name[MAX_PATH];
strncpy(app_name, vargs0 + pos_last_slash + 1, pos_period - pos_last_slash - 1);
app_name[pos_period - pos_last_slash] = '\0';
setAppName(app_name);
char binaries_path[MAX_PATH];
strncpy(binaries_path, vargs0, pos_last_slash);
binaries_path[pos_last_slash] = '\0';
setBinariesPath(binaries_path);
setAppVersion("1.0"); // Dummy for now, but use revision instead if we use
// the minidump for anything else other than
// collecting the callstack.
// cdb.exe is the app used to load the minidump which prints the callstack.
char cdbExePath[MAX_PATH];
#ifdef _WIN64
sprintf(cdbExePath, "%s\\x64\\cdb.exe", SK_CDB_PATH);
#else
sprintf(cdbExePath, "%s\\cdb.exe", SK_CDB_PATH);
#endif
setCdbPath(cdbExePath);
}