[inspector] Initial import of v8_inspector.

src/inspector/V8DebuggerScript.cpp

+// Copyright 2014 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/inspector/V8DebuggerScript.h"
+
+#include "src/inspector/ProtocolPlatform.h"
+#include "src/inspector/StringUtil.h"
+
+namespace v8_inspector {
+
+static const char hexDigits[17] = "0123456789ABCDEF";
+
+static void appendUnsignedAsHex(unsigned number, String16Builder* destination) {
+  for (size_t i = 0; i < 8; ++i) {
+    UChar c = hexDigits[number & 0xF];
+    destination->append(c);
+    number >>= 4;
+  }
+}
+
+// Hash algorithm for substrings is described in "Über die Komplexität der
+// Multiplikation in
+// eingeschränkten Branchingprogrammmodellen" by Woelfe.
+// http://opendatastructures.org/versions/edition-0.1d/ods-java/node33.html#SECTION00832000000000000000
+static String16 calculateHash(const String16& str) {
+  static uint64_t prime[] = {0x3FB75161, 0xAB1F4E4F, 0x82675BC5, 0xCD924D35,
+                             0x81ABE279};
+  static uint64_t random[] = {0x67452301, 0xEFCDAB89, 0x98BADCFE, 0x10325476,
+                              0xC3D2E1F0};
+  static uint32_t randomOdd[] = {0xB4663807, 0xCC322BF5, 0xD4F91BBD, 0xA7BEA11D,
+                                 0x8F462907};
+
+  uint64_t hashes[] = {0, 0, 0, 0, 0};
+  uint64_t zi[] = {1, 1, 1, 1, 1};
+
+  const size_t hashesSize = V8_INSPECTOR_ARRAY_LENGTH(hashes);
+
+  size_t current = 0;
+  const uint32_t* data = nullptr;
+  size_t sizeInBytes = sizeof(UChar) * str.length();
+  data = reinterpret_cast<const uint32_t*>(str.characters16());
+  for (size_t i = 0; i < sizeInBytes / 4; i += 4) {
+    uint32_t v = data[i];
+    uint64_t xi = v * randomOdd[current] & 0x7FFFFFFF;
+    hashes[current] = (hashes[current] + zi[current] * xi) % prime[current];
+    zi[current] = (zi[current] * random[current]) % prime[current];
+    current = current == hashesSize - 1 ? 0 : current + 1;
+  }
+  if (sizeInBytes % 4) {
+    uint32_t v = 0;
+    for (size_t i = sizeInBytes - sizeInBytes % 4; i < sizeInBytes; ++i) {
+      v <<= 8;
+      v |= reinterpret_cast<const uint8_t*>(data)[i];
+    }
+    uint64_t xi = v * randomOdd[current] & 0x7FFFFFFF;
+    hashes[current] = (hashes[current] + zi[current] * xi) % prime[current];
+    zi[current] = (zi[current] * random[current]) % prime[current];
+    current = current == hashesSize - 1 ? 0 : current + 1;
+  }
+
+  for (size_t i = 0; i < hashesSize; ++i)
+    hashes[i] = (hashes[i] + zi[i] * (prime[i] - 1)) % prime[i];
+
+  String16Builder hash;
+  for (size_t i = 0; i < hashesSize; ++i) appendUnsignedAsHex(hashes[i], &hash);
+  return hash.toString();
+}
+
+V8DebuggerScript::V8DebuggerScript(v8::Isolate* isolate,
+                                   v8::Local<v8::Object> object,
+                                   bool isLiveEdit) {
+  v8::Local<v8::Value> idValue =
+      object->Get(toV8StringInternalized(isolate, "id"));
+  DCHECK(!idValue.IsEmpty() && idValue->IsInt32());
+  m_id = String16::fromInteger(idValue->Int32Value());
+
+  m_url = toProtocolStringWithTypeCheck(
+      object->Get(toV8StringInternalized(isolate, "name")));
+  m_sourceURL = toProtocolStringWithTypeCheck(
+      object->Get(toV8StringInternalized(isolate, "sourceURL")));
+  m_sourceMappingURL = toProtocolStringWithTypeCheck(
+      object->Get(toV8StringInternalized(isolate, "sourceMappingURL")));
+  m_startLine = object->Get(toV8StringInternalized(isolate, "startLine"))
+                    ->ToInteger(isolate)
+                    ->Value();
+  m_startColumn = object->Get(toV8StringInternalized(isolate, "startColumn"))
+                      ->ToInteger(isolate)
+                      ->Value();
+  m_endLine = object->Get(toV8StringInternalized(isolate, "endLine"))
+                  ->ToInteger(isolate)
+                  ->Value();
+  m_endColumn = object->Get(toV8StringInternalized(isolate, "endColumn"))
+                    ->ToInteger(isolate)
+                    ->Value();
+  m_executionContextAuxData = toProtocolStringWithTypeCheck(
+      object->Get(toV8StringInternalized(isolate, "executionContextAuxData")));
+  m_executionContextId =
+      object->Get(toV8StringInternalized(isolate, "executionContextId"))
+          ->ToInteger(isolate)
+          ->Value();
+  m_isLiveEdit = isLiveEdit;
+
+  v8::Local<v8::Value> sourceValue =
+      object->Get(toV8StringInternalized(isolate, "source"));
+  if (!sourceValue.IsEmpty() && sourceValue->IsString())
+    setSource(isolate, sourceValue.As<v8::String>());
+}
+
+V8DebuggerScript::~V8DebuggerScript() {}
+
+const String16& V8DebuggerScript::sourceURL() const {
+  return m_sourceURL.isEmpty() ? m_url : m_sourceURL;
+}
+
+v8::Local<v8::String> V8DebuggerScript::source(v8::Isolate* isolate) const {
+  return m_source.Get(isolate);
+}
+
+void V8DebuggerScript::setSourceURL(const String16& sourceURL) {
+  m_sourceURL = sourceURL;
+}
+
+void V8DebuggerScript::setSourceMappingURL(const String16& sourceMappingURL) {
+  m_sourceMappingURL = sourceMappingURL;
+}
+
+void V8DebuggerScript::setSource(v8::Isolate* isolate,
+                                 v8::Local<v8::String> source) {
+  m_source.Reset(isolate, source);
+  m_hash = calculateHash(toProtocolString(source));
+}
+
+}  // namespace v8_inspector