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// Copyright 2009 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/log-utils.h"
#include "src/assert-scope.h"
#include "src/base/platform/platform.h"
#include "src/objects-inl.h"
#include "src/string-stream.h"
#include "src/utils.h"
#include "src/version.h"
namespace v8 {
namespace internal {
const char* const Log::kLogToTemporaryFile = "&";
const char* const Log::kLogToConsole = "-";
// static
FILE* Log::CreateOutputHandle(const char* file_name) {
// If we're logging anything, we need to open the log file.
if (!Log::InitLogAtStart()) {
return nullptr;
} else if (strcmp(file_name, kLogToConsole) == 0) {
return stdout;
} else if (strcmp(file_name, kLogToTemporaryFile) == 0) {
return base::OS::OpenTemporaryFile();
} else {
return base::OS::FOpen(file_name, base::OS::LogFileOpenMode);
}
}
Log::Log(Logger* logger, const char* file_name)
: is_stopped_(false),
output_handle_(Log::CreateOutputHandle(file_name)),
os_(output_handle_ == nullptr ? stdout : output_handle_),
format_buffer_(NewArray<char>(kMessageBufferSize)),
logger_(logger) {
// --log-all enables all the log flags.
if (FLAG_log_all) {
FLAG_log_api = true;
FLAG_log_code = true;
FLAG_log_suspect = true;
FLAG_log_handles = true;
FLAG_log_internal_timer_events = true;
FLAG_log_function_events = true;
}
// --prof implies --log-code.
if (FLAG_prof) FLAG_log_code = true;
if (output_handle_ == nullptr) return;
Log::MessageBuilder msg(this);
LogSeparator kNext = LogSeparator::kSeparator;
msg << "v8-version" << kNext << Version::GetMajor() << kNext
<< Version::GetMinor() << kNext << Version::GetBuild() << kNext
<< Version::GetPatch();
if (strlen(Version::GetEmbedder()) != 0) {
msg << kNext << Version::GetEmbedder();
}
msg << kNext << Version::IsCandidate();
msg.WriteToLogFile();
}
FILE* Log::Close() {
FILE* result = nullptr;
if (output_handle_ != nullptr) {
if (strcmp(FLAG_logfile, kLogToTemporaryFile) != 0) {
fclose(output_handle_);
} else {
result = output_handle_;
}
}
output_handle_ = nullptr;
DeleteArray(format_buffer_);
format_buffer_ = nullptr;
is_stopped_ = false;
return result;
}
Log::MessageBuilder::MessageBuilder(Log* log)
: log_(log), lock_guard_(&log_->mutex_) {
DCHECK_NOT_NULL(log_->format_buffer_);
}
void Log::MessageBuilder::Append(const char* format, ...) {
va_list args;
va_start(args, format);
AppendVA(format, args);
va_end(args);
}
void Log::MessageBuilder::AppendVA(const char* format, va_list args) {
Vector<char> buf(log_->format_buffer_, Log::kMessageBufferSize);
int length = v8::internal::VSNPrintF(buf, format, args);
// {length} is -1 if output was truncated.
if (length == -1) length = Log::kMessageBufferSize;
DCHECK_LE(length, Log::kMessageBufferSize);
AppendStringPart(log_->format_buffer_, length);
}
void Log::MessageBuilder::AppendSymbolName(Symbol* symbol) {
DCHECK(symbol);
OFStream& os = log_->os_;
os << "symbol(";
if (!symbol->name()->IsUndefined()) {
os << "\"";
AppendDetailed(String::cast(symbol->name()), false);
os << "\" ";
}
os << "hash " << std::hex << symbol->Hash() << std::dec << ")";
}
void Log::MessageBuilder::AppendDetailed(String* str, bool show_impl_info) {
if (str == nullptr) return;
DisallowHeapAllocation no_gc; // Ensure string stay valid.
OFStream& os = log_->os_;
int limit = str->length();
if (limit > 0x1000) limit = 0x1000;
if (show_impl_info) {
os << (str->IsOneByteRepresentation() ? 'a' : '2');
if (StringShape(str).IsExternal()) os << 'e';
if (StringShape(str).IsInternalized()) os << '#';
os << ':' << str->length() << ':';
}
AppendStringPart(str, limit);
}
void Log::MessageBuilder::AppendString(String* str) {
if (str == nullptr) return;
int len = str->length();
AppendStringPart(str, len);
}
void Log::MessageBuilder::AppendString(const char* string) {
if (string == nullptr) return;
for (const char* p = string; *p != '\0'; p++) {
this->AppendCharacter(*p);
}
}
void Log::MessageBuilder::AppendStringPart(String* str, int len) {
DCHECK_LE(len, str->length());
DisallowHeapAllocation no_gc; // Ensure string stay valid.
// TODO(cbruni): unify escaping.
for (int i = 0; i < len; i++) {
uc32 c = str->Get(i);
if (c <= 0xFF) {
AppendCharacter(static_cast<char>(c));
} else {
// Escape any non-ascii range characters.
Append("\\u%04x", c);
}
}
}
void Log::MessageBuilder::AppendStringPart(const char* str, size_t len) {
for (size_t i = 0; i < len; i++) {
DCHECK_NE(str[i], '\0');
this->AppendCharacter(str[i]);
}
}
void Log::MessageBuilder::AppendCharacter(char c) {
OFStream& os = log_->os_;
// A log entry (separate by commas) cannot contain commas or line-breaks.
if (c >= 32 && c <= 126) {
if (c == ',') {
// Escape commas (log field separator) directly.
os << "\\x2C";
} else {
// Directly append any printable ascii character.
os << c;
}
} else if (c == '\n') {
os << "\\n";
} else {
// Escape any non-printable characters.
Append("\\x%02x", c);
}
}
void Log::MessageBuilder::WriteToLogFile() { log_->os_ << std::endl; }
template <>
Log::MessageBuilder& Log::MessageBuilder::operator<<<const char*>(
const char* string) {
this->AppendString(string);
return *this;
}
template <>
Log::MessageBuilder& Log::MessageBuilder::operator<<<void*>(void* pointer) {
OFStream& os = log_->os_;
// Manually format the pointer since on Windows we do not consistently
// get a "0x" prefix.
os << "0x" << std::hex << reinterpret_cast<intptr_t>(pointer) << std::dec;
return *this;
}
template <>
Log::MessageBuilder& Log::MessageBuilder::operator<<<char>(char c) {
this->AppendCharacter(c);
return *this;
}
template <>
Log::MessageBuilder& Log::MessageBuilder::operator<<<String*>(String* string) {
this->AppendString(string);
return *this;
}
template <>
Log::MessageBuilder& Log::MessageBuilder::operator<<<Symbol*>(Symbol* symbol) {
this->AppendSymbolName(symbol);
return *this;
}
template <>
Log::MessageBuilder& Log::MessageBuilder::operator<<<Name*>(Name* name) {
if (name->IsString()) {
this->AppendString(String::cast(name));
} else {
this->AppendSymbolName(Symbol::cast(name));
}
return *this;
}
template <>
Log::MessageBuilder& Log::MessageBuilder::operator<<<LogSeparator>(
LogSeparator separator) {
log_->os_ << ',';
return *this;
}
} // namespace internal
} // namespace v8
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