utils: Add ProcessCallStack to collect stack traces for all threads in a process
- Also add a Printer class (print lines to logcat, fd, or strings)
Bug: 11324229
Change-Id: I78435ed49aa196a0efb45bf9b2d58b62c41737d3
diff --git a/libutils/Printer.cpp b/libutils/Printer.cpp
new file mode 100644
index 0000000..b062ef0
--- /dev/null
+++ b/libutils/Printer.cpp
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "Printer"
+// #define LOG_NDEBUG 0
+
+#include <utils/Printer.h>
+#include <utils/String8.h>
+#include <utils/Log.h>
+
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifndef __BIONIC__
+#define fdprintf dprintf
+#endif
+
+namespace android {
+
+/*
+ * Implementation of Printer
+ */
+Printer::Printer() {
+ // Intentionally left empty
+}
+
+Printer::~Printer() {
+ // Intentionally left empty
+}
+
+void Printer::printFormatLine(const char* format, ...) {
+ va_list arglist;
+ va_start(arglist, format);
+
+ char* formattedString;
+ if (vasprintf(&formattedString, format, arglist) < 0) { // returns -1 on error
+ ALOGE("%s: Failed to format string", __FUNCTION__);
+ return;
+ }
+ va_end(arglist);
+
+ printLine(formattedString);
+ free(formattedString);
+}
+
+/*
+ * Implementation of LogPrinter
+ */
+LogPrinter::LogPrinter(const char* logtag,
+ android_LogPriority priority,
+ const char* prefix,
+ bool ignoreBlankLines) :
+ mLogTag(logtag),
+ mPriority(priority),
+ mPrefix(prefix ?: ""),
+ mIgnoreBlankLines(ignoreBlankLines) {
+}
+
+void LogPrinter::printLine(const char* string) {
+ if (string == NULL) {
+ ALOGW("%s: NULL string passed in", __FUNCTION__);
+ return;
+ }
+
+ if (mIgnoreBlankLines || (*string)) {
+ // Simple case: Line is not blank, or we don't care about printing blank lines
+ printRaw(string);
+ } else {
+ // Force logcat to print empty lines by adding prefixing with a space
+ printRaw(" ");
+ }
+}
+
+void LogPrinter::printRaw(const char* string) {
+ __android_log_print(mPriority, mLogTag, "%s%s", mPrefix, string);
+}
+
+
+/*
+ * Implementation of FdPrinter
+ */
+FdPrinter::FdPrinter(int fd, unsigned int indent, const char* prefix) :
+ mFd(fd), mIndent(indent), mPrefix(prefix ?: "") {
+
+ if (fd < 0) {
+ ALOGW("%s: File descriptor out of range (%d)", __FUNCTION__, fd);
+ }
+
+ // <indent><prefix><line> -- e.g. '%-4s%s\n' for indent=4
+ snprintf(mFormatString, sizeof(mFormatString), "%%-%us%%s\n", mIndent);
+}
+
+void FdPrinter::printLine(const char* string) {
+ if (string == NULL) {
+ ALOGW("%s: NULL string passed in", __FUNCTION__);
+ return;
+ } else if (mFd < 0) {
+ ALOGW("%s: File descriptor out of range (%d)", __FUNCTION__, mFd);
+ return;
+ }
+
+ fdprintf(mFd, mFormatString, mPrefix, string);
+}
+
+/*
+ * Implementation of String8Printer
+ */
+String8Printer::String8Printer(String8* target, const char* prefix) :
+ mTarget(target),
+ mPrefix(prefix ?: "") {
+
+ if (target == NULL) {
+ ALOGW("%s: Target string was NULL", __FUNCTION__);
+ }
+}
+
+void String8Printer::printLine(const char* string) {
+ if (string == NULL) {
+ ALOGW("%s: NULL string passed in", __FUNCTION__);
+ return;
+ } else if (mTarget == NULL) {
+ ALOGW("%s: Target string was NULL", __FUNCTION__);
+ return;
+ }
+
+ mTarget->append(string);
+ mTarget->append("\n");
+}
+
+/*
+ * Implementation of PrefixPrinter
+ */
+PrefixPrinter::PrefixPrinter(Printer& printer, const char* prefix) :
+ mPrinter(printer), mPrefix(prefix ?: "") {
+}
+
+void PrefixPrinter::printLine(const char* string) {
+ mPrinter.printFormatLine("%s%s", mPrefix, string);
+}
+
+}; //namespace android