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// Copyright 2009 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "log-utils.h"
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#include "string-stream.h"
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const char* const Log::kLogToTemporaryFile = "&";
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Log::Log(Logger* logger)
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ll_output_handle_(NULL),
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message_buffer_(NULL),
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static void AddIsolateIdIfNeeded(StringStream* stream) {
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Isolate* isolate = Isolate::Current();
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if (isolate->IsDefaultIsolate()) return;
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stream->Add("isolate-%p-", isolate);
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void Log::Initialize() {
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mutex_ = OS::CreateMutex();
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message_buffer_ = NewArray<char>(kMessageBufferSize);
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// --log-all enables all the log flags.
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FLAG_log_runtime = true;
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FLAG_log_suspect = true;
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FLAG_log_handles = true;
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FLAG_log_regexp = true;
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// --prof implies --log-code.
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if (FLAG_prof) FLAG_log_code = true;
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// --prof_lazy controls --log-code, implies --noprof_auto.
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FLAG_log_code = false;
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FLAG_prof_auto = false;
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bool open_log_file = FLAG_log || FLAG_log_runtime || FLAG_log_api
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|| FLAG_log_code || FLAG_log_gc || FLAG_log_handles || FLAG_log_suspect
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|| FLAG_log_regexp || FLAG_log_state_changes || FLAG_ll_prof;
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// If we're logging anything, we need to open the log file.
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if (strcmp(FLAG_logfile, "-") == 0) {
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} else if (strcmp(FLAG_logfile, kLogToTemporaryFile) == 0) {
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if (strchr(FLAG_logfile, '%') != NULL ||
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!Isolate::Current()->IsDefaultIsolate()) {
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// If there's a '%' in the log file name we have to expand
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HeapStringAllocator allocator;
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StringStream stream(&allocator);
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AddIsolateIdIfNeeded(&stream);
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for (const char* p = FLAG_logfile; *p; p++) {
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// If there's a % at the end of the string we back up
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// one character so we can escape the loop properly.
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// %t expands to the current time in milliseconds.
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double time = OS::TimeCurrentMillis();
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stream.Add("%.0f", FmtElm(time));
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// %% expands (contracts really) to %.
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// All other %'s expand to themselves.
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SmartArrayPointer<const char> expanded = stream.ToCString();
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OpenFile(FLAG_logfile);
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void Log::OpenStdout() {
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ASSERT(!IsEnabled());
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output_handle_ = stdout;
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void Log::OpenTemporaryFile() {
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ASSERT(!IsEnabled());
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output_handle_ = i::OS::OpenTemporaryFile();
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// Extension added to V8 log file name to get the low-level log name.
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static const char kLowLevelLogExt[] = ".ll";
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// File buffer size of the low-level log. We don't use the default to
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// minimize the associated overhead.
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static const int kLowLevelLogBufferSize = 2 * MB;
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void Log::OpenFile(const char* name) {
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ASSERT(!IsEnabled());
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output_handle_ = OS::FOpen(name, OS::LogFileOpenMode);
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// Open the low-level log file.
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size_t len = strlen(name);
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ScopedVector<char> ll_name(static_cast<int>(len + sizeof(kLowLevelLogExt)));
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memcpy(ll_name.start(), name, len);
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memcpy(ll_name.start() + len, kLowLevelLogExt, sizeof(kLowLevelLogExt));
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ll_output_handle_ = OS::FOpen(ll_name.start(), OS::LogFileOpenMode);
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setvbuf(ll_output_handle_, NULL, _IOFBF, kLowLevelLogBufferSize);
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if (output_handle_ != NULL) {
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if (strcmp(FLAG_logfile, kLogToTemporaryFile) != 0) {
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fclose(output_handle_);
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result = output_handle_;
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output_handle_ = NULL;
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if (ll_output_handle_ != NULL) fclose(ll_output_handle_);
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ll_output_handle_ = NULL;
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DeleteArray(message_buffer_);
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message_buffer_ = NULL;
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LogMessageBuilder::LogMessageBuilder(Logger* logger)
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: log_(logger->log_),
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ASSERT(log_->message_buffer_ != NULL);
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void LogMessageBuilder::Append(const char* format, ...) {
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Vector<char> buf(log_->message_buffer_ + pos_,
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Log::kMessageBufferSize - pos_);
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va_start(args, format);
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AppendVA(format, args);
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ASSERT(pos_ <= Log::kMessageBufferSize);
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void LogMessageBuilder::AppendVA(const char* format, va_list args) {
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Vector<char> buf(log_->message_buffer_ + pos_,
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Log::kMessageBufferSize - pos_);
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int result = v8::internal::OS::VSNPrintF(buf, format, args);
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// Result is -1 if output was truncated.
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pos_ = Log::kMessageBufferSize;
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ASSERT(pos_ <= Log::kMessageBufferSize);
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void LogMessageBuilder::Append(const char c) {
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if (pos_ < Log::kMessageBufferSize) {
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log_->message_buffer_[pos_++] = c;
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ASSERT(pos_ <= Log::kMessageBufferSize);
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void LogMessageBuilder::Append(String* str) {
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AssertNoAllocation no_heap_allocation; // Ensure string stay valid.
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int length = str->length();
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for (int i = 0; i < length; i++) {
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Append(static_cast<char>(str->Get(i)));
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void LogMessageBuilder::AppendAddress(Address addr) {
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Append("0x%" V8PRIxPTR, addr);
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void LogMessageBuilder::AppendDetailed(String* str, bool show_impl_info) {
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if (str == NULL) return;
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AssertNoAllocation no_heap_allocation; // Ensure string stay valid.
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int len = str->length();
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if (show_impl_info) {
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Append(str->IsAsciiRepresentation() ? 'a' : '2');
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if (StringShape(str).IsExternal())
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if (StringShape(str).IsSymbol())
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Append(":%i:", str->length());
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for (int i = 0; i < len; i++) {
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uc32 c = str->Get(i);
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Append("\\u%04x", c);
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} else if (c < 32 || c > 126) {
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Append("\\x%02x", c);
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} else if (c == ',') {
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} else if (c == '\\') {
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} else if (c == '\"') {
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void LogMessageBuilder::AppendStringPart(const char* str, int len) {
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if (pos_ + len > Log::kMessageBufferSize) {
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len = Log::kMessageBufferSize - pos_;
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if (len == 0) return;
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Vector<char> buf(log_->message_buffer_ + pos_,
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Log::kMessageBufferSize - pos_);
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OS::StrNCpy(buf, str, len);
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ASSERT(pos_ <= Log::kMessageBufferSize);
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void LogMessageBuilder::WriteToLogFile() {
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ASSERT(pos_ <= Log::kMessageBufferSize);
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const int written = log_->WriteToFile(log_->message_buffer_, pos_);
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if (written != pos_) {
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log_->logger_->LogFailure();
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} } // namespace v8::internal