[inspector] Split V8DebuggerScript implementation for wasm

src/inspector/v8-debugger-script.cc

 // 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/v8-debugger-script.h"
 
 #include "src/inspector/string-util.h"
 
 namespace v8_inspector {
 
-static const char hexDigits[17] = "0123456789ABCDEF";
+namespace {
 
-static void appendUnsignedAsHex(uint64_t number, String16Builder* destination) {
+const char hexDigits[17] = "0123456789ABCDEF";
+
+void appendUnsignedAsHex(uint64_t 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) {
+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};
 
@@ skipping 23 matching lines @@
   }
 
   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::debug::Script> script,
-                                   bool isLiveEdit) {
-  m_isolate = script->GetIsolate();
-  m_id = String16::fromInteger(script->Id());
-  v8::Local<v8::String> tmp;
-  if (script->Name().ToLocal(&tmp)) m_url = toProtocolString(tmp);
-  if (script->SourceURL().ToLocal(&tmp)) {
-    m_sourceURL = toProtocolString(tmp);
-    if (m_url.isEmpty()) m_url = toProtocolString(tmp);
-  }
-  if (script->SourceMappingURL().ToLocal(&tmp))
-    m_sourceMappingURL = toProtocolString(tmp);
-  m_startLine = script->LineOffset();
-  m_startColumn = script->ColumnOffset();
-  std::vector<int> lineEnds = script->LineEnds();
-  CHECK(lineEnds.size());
-  int source_length = lineEnds[lineEnds.size() - 1];
-  if (lineEnds.size()) {
-    m_endLine = static_cast<int>(lineEnds.size()) + m_startLine - 1;
-    if (lineEnds.size() > 1) {
-      m_endColumn = source_length - lineEnds[lineEnds.size() - 2] - 1;
+class ActualScript : public V8DebuggerScript {
+  friend class V8DebuggerScript;
+
+ public:
+  ActualScript(v8::Isolate* isolate, v8::Local<v8::debug::Script> script,
+               bool isLiveEdit)
+      : V8DebuggerScript(isolate, String16::fromInteger(script->Id()),
+                         GetNameOrSourceUrl(script)),
+        m_isLiveEdit(isLiveEdit) {
+    v8::Local<v8::String> tmp;
+    if (script->SourceURL().ToLocal(&tmp)) m_sourceURL = toProtocolString(tmp);
+    if (script->SourceMappingURL().ToLocal(&tmp))
+      m_sourceMappingURL = toProtocolString(tmp);
+    m_startLine = script->LineOffset();
+    m_startColumn = script->ColumnOffset();
+    std::vector<int> lineEnds = script->LineEnds();
+    CHECK(lineEnds.size());
+    int source_length = lineEnds[lineEnds.size() - 1];
+    if (lineEnds.size()) {
+      m_endLine = static_cast<int>(lineEnds.size()) + m_startLine - 1;
+      if (lineEnds.size() > 1) {
+        m_endColumn = source_length - lineEnds[lineEnds.size() - 2] - 1;
+      } else {
+        m_endColumn = source_length + m_startColumn;
+      }
     } else {
-      m_endColumn = source_length + m_startColumn;
+      m_endLine = m_startLine;
+      m_endColumn = m_startColumn;
     }
-  } else {
-    m_endLine = m_startLine;
-    m_endColumn = m_startColumn;
+
+    if (script->ContextData().ToLocal(&tmp)) {
+      String16 contextData = toProtocolString(tmp);
+      size_t firstComma = contextData.find(",", 0);
+      size_t secondComma = firstComma != String16::kNotFound
+                               ? contextData.find(",", firstComma + 1)
+                               : String16::kNotFound;
+      if (secondComma != String16::kNotFound) {
+        String16 executionContextId =
+            contextData.substring(firstComma + 1, secondComma - firstComma - 1);
+        bool isOk = false;
+        m_executionContextId = executionContextId.toInteger(&isOk);
+        if (!isOk) m_executionContextId = 0;
+        m_executionContextAuxData = contextData.substring(secondComma + 1);
+      }
+    }
+
+    if (script->Source().ToLocal(&tmp)) {
+      m_sourceObj.Reset(m_isolate, tmp);
+      String16 source = toProtocolString(tmp);
+      // V8 will not count last line if script source ends with \n.
+      if (source.length() > 1 && source[source.length() - 1] == '\n') {
+        m_endLine++;
+        m_endColumn = 0;
+      }
+    }
+
+    m_script.Reset(m_isolate, script);
   }
 
-  if (script->ContextData().ToLocal(&tmp)) {
-    String16 contextData = toProtocolString(tmp);
-    size_t firstComma = contextData.find(",", 0);
-    size_t secondComma = firstComma != String16::kNotFound
-                             ? contextData.find(",", firstComma + 1)
-                             : String16::kNotFound;
-    if (secondComma != String16::kNotFound) {
-      String16 executionContextId =
-          contextData.substring(firstComma + 1, secondComma - firstComma - 1);
-      bool isOk = false;
-      m_executionContextId = executionContextId.toInteger(&isOk);
-      if (!isOk) m_executionContextId = 0;
-      m_executionContextAuxData = contextData.substring(secondComma + 1);
-    }
+  bool isLiveEdit() const override { return m_isLiveEdit; }
+
+  const String16& executionContextAuxData() const override {
+    return m_executionContextAuxData;
   }
 
-  m_isLiveEdit = isLiveEdit;
-
-  if (script->Source().ToLocal(&tmp)) {
-    m_sourceObj.Reset(m_isolate, tmp);
-    String16 source = toProtocolString(tmp);
-    // V8 will not count last line if script source ends with \n.
-    if (source.length() > 1 && source[source.length() - 1] == '\n') {
-      m_endLine++;
-      m_endColumn = 0;
-    }
+  const String16& sourceMappingURL() const override {
+    return m_sourceMappingURL;
   }
 
-  m_script.Reset(m_isolate, script);
+  String16 source(v8::Isolate* isolate) const override {
+    if (!m_sourceObj.IsEmpty())
+      return toProtocolString(m_sourceObj.Get(isolate));
+    return V8DebuggerScript::source(isolate);
+  }
+
+  void setSourceMappingURL(const String16& sourceMappingURL) override {
+    m_sourceMappingURL = sourceMappingURL;
+  }
+
+  void setSource(v8::Local<v8::String> source) override {
+    m_source = String16();
+    m_sourceObj.Reset(m_isolate, source);
+    m_hash = String16();
+  }
+
+  bool getPossibleBreakpoints(
+      const v8::debug::Location& start, const v8::debug::Location& end,
+      std::vector<v8::debug::Location>* locations) override {
+    v8::HandleScope scope(m_isolate);
+    v8::Local<v8::debug::Script> script = m_script.Get(m_isolate);
+    return script->GetPossibleBreakpoints(start, end, locations);
+  }
+
+ private:
+  String16 GetNameOrSourceUrl(v8::Local<v8::debug::Script> script) {
+    v8::Local<v8::String> name;
+    if (script->Name().ToLocal(&name) || script->SourceURL().ToLocal(&name))
+      return toProtocolString(name);
+    return String16();
+  }
+
+  String16 m_sourceMappingURL;
+  v8::Global<v8::String> m_sourceObj;
+  String16 m_executionContextAuxData;
+  bool m_isLiveEdit = false;
+  v8::Global<v8::debug::Script> m_script;
+};
+
+class WasmVirtualScript : public V8DebuggerScript {
+  friend class V8DebuggerScript;
+
+ public:
+  WasmVirtualScript(v8::Isolate* isolate,
+                    v8::Local<v8::debug::WasmScript> script, String16 id,
+                    String16 url, String16 source)
+      : V8DebuggerScript(isolate, std::move(id), std::move(url)),
+        m_script(isolate, script) {
+    int num_lines = 0;
+    int last_newline = -1;
+    size_t next_newline = source.find('\n', last_newline + 1);
+    while (next_newline != String16::kNotFound) {
+      last_newline = static_cast<int>(next_newline);
+      next_newline = source.find('\n', last_newline + 1);
+      ++num_lines;
+    }
+    m_endLine = num_lines;
+    m_endColumn = static_cast<int>(source.length()) - last_newline - 1;
+    m_source = std::move(source);
+  }
+
+  const String16& sourceMappingURL() const override { return emptyString(); }
+  const String16& executionContextAuxData() const override {
+    return emptyString();
+  }
+  bool isLiveEdit() const override { return false; }
+  void setSourceMappingURL(const String16&) override {}
+
+  bool getPossibleBreakpoints(
+      const v8::debug::Location& start, const v8::debug::Location& end,
+      std::vector<v8::debug::Location>* locations) override {
+    // TODO(clemensh): Returning false produces the protocol error "Internal
+    // error". Implement and fix expected output of
+    // wasm-get-breakable-locations.js.
+    return false;
+  }
+
+ private:
+  static const String16& emptyString() {
+    static const String16 singleEmptyString;
+    return singleEmptyString;
+  }
+
+  v8::Global<v8::debug::WasmScript> m_script;
+};
+
+}  // namespace
+
+std::unique_ptr<V8DebuggerScript> V8DebuggerScript::Create(
+    v8::Isolate* isolate, v8::Local<v8::debug::Script> scriptObj,
+    bool isLiveEdit) {
+  return std::unique_ptr<ActualScript>(
+      new ActualScript(isolate, scriptObj, isLiveEdit));
 }
 
-V8DebuggerScript::V8DebuggerScript(String16 id, String16 url, String16 source)
-    : m_id(std::move(id)), m_url(std::move(url)), m_source(std::move(source)) {
-  int num_lines = 0;
-  int last_newline = -1;
-  size_t next_newline = m_source.find('\n', last_newline + 1);
-  while (next_newline != String16::kNotFound) {
-    last_newline = static_cast<int>(next_newline);
-    next_newline = m_source.find('\n', last_newline + 1);
-    ++num_lines;
-  }
-  m_endLine = num_lines;
-  m_endColumn = static_cast<int>(m_source.length()) - last_newline - 1;
+std::unique_ptr<V8DebuggerScript> V8DebuggerScript::CreateWasm(
+    v8::Isolate* isolate, v8::Local<v8::debug::WasmScript> underlyingScript,
+    String16 id, String16 url, String16 source) {
+  return std::unique_ptr<WasmVirtualScript>(
+      new WasmVirtualScript(isolate, underlyingScript, std::move(id),
+                            std::move(url), std::move(source)));
 }
 
+V8DebuggerScript::V8DebuggerScript(v8::Isolate* isolate, String16 id,
+                                   String16 url)
+    : m_id(std::move(id)), m_url(std::move(url)), m_isolate(isolate) {}
+
 V8DebuggerScript::~V8DebuggerScript() {}
 
 const String16& V8DebuggerScript::sourceURL() const {
   return m_sourceURL.isEmpty() ? m_url : m_sourceURL;
 }
 
-String16 V8DebuggerScript::source(v8::Isolate* isolate) const {
-  if (m_sourceObj.IsEmpty()) return m_source;
-  return toProtocolString(m_sourceObj.Get(isolate));
-}
-
 const String16& V8DebuggerScript::hash(v8::Isolate* isolate) const {
   if (m_hash.isEmpty()) m_hash = calculateHash(source(isolate));
   DCHECK(!m_hash.isEmpty());
   return m_hash;
 }
 
 void V8DebuggerScript::setSourceURL(const String16& sourceURL) {
   m_sourceURL = sourceURL;
 }
 
-void V8DebuggerScript::setSourceMappingURL(const String16& sourceMappingURL) {
-  m_sourceMappingURL = sourceMappingURL;
-}
-
-void V8DebuggerScript::setSource(v8::Local<v8::String> source) {
-  m_source = String16();
-  m_sourceObj.Reset(m_isolate, source);
-  m_hash = String16();
-}
-
-bool V8DebuggerScript::getPossibleBreakpoints(
-    const v8::debug::Location& start, const v8::debug::Location& end,
-    std::vector<v8::debug::Location>* locations) {
-  v8::HandleScope scope(m_isolate);
-  v8::Local<v8::debug::Script> script = m_script.Get(m_isolate);
-  return script->GetPossibleBreakpoints(start, end, locations);
-}
-
 }  // namespace v8_inspector