Preparser extracted into separate files that can be compiled to a library.

src/preparser-api.cc

+// Copyright 2010 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "../include/v8-preparser.h"
+#include "globals.h"
+#include "checks.h"
+#include "allocation.h"
+#include "utils.h"
+#include "list.h"
+#include "scanner-base.h"
+#include "preparse-data.h"
+#include "preparser.h"
+
+namespace v8 {
+namespace internal {
+
+// UTF16Buffer based on a v8::UnicodeInputStream.
+class InputStreamUTF16Buffer : public UTF16Buffer {
+ public:
+  explicit InputStreamUTF16Buffer(UnicodeInputStream* stream)
+      : UTF16Buffer(),
+        stream_(stream) { }
+
+  virtual ~InputStreamUTF16Buffer() { }
+
+  virtual void PushBack(uc32 ch) {
+    stream_->PushBack(ch);
+    pos_--;
+  }
+
+  virtual uc32 Advance() {
+    uc32 result = stream_->Next();
+    if (result >= 0) pos_++;
+    return result;
+  }
+
+  virtual void SeekForward(int pos) {
+    // Seeking in the input is not used by preparsing.
+    // It's only used by the real parser based on preparser data.
+    UNIMPLEMENTED();
+  }
+
+ private:
+  v8::UnicodeInputStream* const stream_;
+};
+
+
+class StandAloneJavaScriptScanner : public JavaScriptScanner {
+ public:
+  void Initialize(UTF16Buffer* source) {
+    source_ = source;
+    literal_flags_ = kLiteralString | kLiteralIdentifier;
+    Init();
+    // Skip initial whitespace allowing HTML comment ends just like
+    // after a newline and scan first token.
+    has_line_terminator_before_next_ = true;
+    SkipWhiteSpace();
+    Scan();
+  }
+};
+
+
+// Functions declared by allocation.h
+
+void FatalProcessOutOfMemory(const char* reason) {
+  V8_Fatal(__FILE__, __LINE__, reason);
+}
+
+bool EnableSlowAsserts() { return true; }
+
+
+}  // namespace internal.
+
+
+UnicodeInputStream::~UnicodeInputStream() { }
+
+
+PreParserData Preparse(UnicodeInputStream* input, size_t max_stack) {
+  internal::InputStreamUTF16Buffer buffer(input);
+  uintptr_t stack_limit = reinterpret_cast<uintptr_t>(&buffer) - max_stack;
+  internal::StandAloneJavaScriptScanner scanner;
+  scanner.Initialize(&buffer);
+  internal::CompleteParserRecorder recorder;
+  preparser::PreParser::PreParseResult result =
+      preparser::PreParser::PreParseProgram(&scanner,
+                                            &recorder,
+                                            true,
+                                            stack_limit);
+  if (result == preparser::PreParser::kPreParseStackOverflow) {
+    return PreParserData::StackOverflow();
+  }
+  internal::Vector<unsigned> pre_data = recorder.ExtractData();
+  size_t size = pre_data.length() * sizeof(pre_data[0]);
+  unsigned char* data = reinterpret_cast<unsigned char*>(pre_data.start());
+  return PreParserData(size, data);
+}
+
+}  // namespace v8.
+
+
+// Used by ASSERT macros and other immediate exits.
+extern "C" void V8_Fatal(const char* file, int line, const char* format, ...) {
+  exit(EXIT_FAILURE);
+}