// Copyright 2016 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "src/tracing/traced-value.h"
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#include "src/base/platform/platform.h"
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#include "src/conversions.h"
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namespace v8 {
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namespace tracing {
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namespace {
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#define DCHECK_CURRENT_CONTAINER_IS(x) DCHECK_EQ(x, nesting_stack_.back())
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#define DCHECK_CONTAINER_STACK_DEPTH_EQ(x) DCHECK_EQ(x, nesting_stack_.size())
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#ifdef DEBUG
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const bool kStackTypeDict = false;
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const bool kStackTypeArray = true;
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#define DEBUG_PUSH_CONTAINER(x) nesting_stack_.push_back(x)
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#define DEBUG_POP_CONTAINER() nesting_stack_.pop_back()
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#else
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#define DEBUG_PUSH_CONTAINER(x) ((void)0)
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#define DEBUG_POP_CONTAINER() ((void)0)
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#endif
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void EscapeAndAppendString(const char* value, std::string* result) {
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*result += '"';
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char number_buffer[10];
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while (*value) {
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char c = *value++;
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switch (c) {
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case '\t':
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*result += "\\t";
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break;
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case '\n':
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*result += "\\n";
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break;
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case '\"':
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*result += "\\\"";
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break;
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case '\\':
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*result += "\\\\";
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break;
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default:
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if (c < '\x20') {
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base::OS::SNPrintF(
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number_buffer, arraysize(number_buffer), "\\u%04X",
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static_cast<unsigned>(static_cast<unsigned char>(c)));
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*result += number_buffer;
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} else {
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*result += c;
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}
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}
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}
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*result += '"';
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}
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} // namespace
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std::unique_ptr<TracedValue> TracedValue::Create() {
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return std::unique_ptr<TracedValue>(new TracedValue());
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}
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TracedValue::TracedValue() : first_item_(true) {
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DEBUG_PUSH_CONTAINER(kStackTypeDict);
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}
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TracedValue::~TracedValue() {
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DCHECK_CURRENT_CONTAINER_IS(kStackTypeDict);
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DEBUG_POP_CONTAINER();
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DCHECK_CONTAINER_STACK_DEPTH_EQ(0u);
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}
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void TracedValue::SetInteger(const char* name, int value) {
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DCHECK_CURRENT_CONTAINER_IS(kStackTypeDict);
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WriteName(name);
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data_ += std::to_string(value);
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}
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void TracedValue::SetDouble(const char* name, double value) {
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DCHECK_CURRENT_CONTAINER_IS(kStackTypeDict);
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WriteName(name);
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i::EmbeddedVector<char, 100> buffer;
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data_ += DoubleToCString(value, buffer);
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}
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void TracedValue::SetBoolean(const char* name, bool value) {
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DCHECK_CURRENT_CONTAINER_IS(kStackTypeDict);
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WriteName(name);
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data_ += value ? "true" : "false";
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}
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void TracedValue::SetString(const char* name, const char* value) {
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DCHECK_CURRENT_CONTAINER_IS(kStackTypeDict);
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WriteName(name);
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EscapeAndAppendString(value, &data_);
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}
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void TracedValue::BeginDictionary(const char* name) {
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DCHECK_CURRENT_CONTAINER_IS(kStackTypeDict);
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DEBUG_PUSH_CONTAINER(kStackTypeDict);
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WriteName(name);
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data_ += '{';
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first_item_ = true;
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}
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void TracedValue::BeginArray(const char* name) {
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DCHECK_CURRENT_CONTAINER_IS(kStackTypeDict);
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DEBUG_PUSH_CONTAINER(kStackTypeArray);
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WriteName(name);
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data_ += '[';
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first_item_ = true;
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}
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void TracedValue::AppendInteger(int value) {
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DCHECK_CURRENT_CONTAINER_IS(kStackTypeArray);
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WriteComma();
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data_ += std::to_string(value);
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}
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void TracedValue::AppendDouble(double value) {
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DCHECK_CURRENT_CONTAINER_IS(kStackTypeArray);
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WriteComma();
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i::EmbeddedVector<char, 100> buffer;
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data_ += DoubleToCString(value, buffer);
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}
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void TracedValue::AppendBoolean(bool value) {
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DCHECK_CURRENT_CONTAINER_IS(kStackTypeArray);
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WriteComma();
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data_ += value ? "true" : "false";
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}
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void TracedValue::AppendString(const char* value) {
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DCHECK_CURRENT_CONTAINER_IS(kStackTypeArray);
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WriteComma();
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EscapeAndAppendString(value, &data_);
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}
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void TracedValue::BeginDictionary() {
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DCHECK_CURRENT_CONTAINER_IS(kStackTypeArray);
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DEBUG_PUSH_CONTAINER(kStackTypeDict);
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WriteComma();
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data_ += '{';
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first_item_ = true;
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}
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void TracedValue::BeginArray() {
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DCHECK_CURRENT_CONTAINER_IS(kStackTypeArray);
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DEBUG_PUSH_CONTAINER(kStackTypeArray);
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WriteComma();
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data_ += '[';
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first_item_ = true;
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}
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void TracedValue::EndDictionary() {
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DCHECK_CURRENT_CONTAINER_IS(kStackTypeDict);
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DEBUG_POP_CONTAINER();
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data_ += '}';
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first_item_ = false;
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}
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void TracedValue::EndArray() {
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DCHECK_CURRENT_CONTAINER_IS(kStackTypeArray);
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DEBUG_POP_CONTAINER();
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data_ += ']';
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first_item_ = false;
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}
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void TracedValue::WriteComma() {
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if (first_item_) {
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first_item_ = false;
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} else {
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data_ += ',';
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}
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}
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void TracedValue::WriteName(const char* name) {
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WriteComma();
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data_ += '"';
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data_ += name;
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data_ += "\":";
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}
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void TracedValue::AppendAsTraceFormat(std::string* out) const {
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*out += '{';
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*out += data_;
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*out += '}';
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}
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} // namespace tracing
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} // namespace v8
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