Move V8 to external/v8
Change-Id: If68025d67453785a651c5dfb34fad298c16676a4
diff --git a/samples/shell.cc b/samples/shell.cc
new file mode 100644
index 0000000..27ed293
--- /dev/null
+++ b/samples/shell.cc
@@ -0,0 +1,303 @@
+// Copyright 2009 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 <v8.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+
+void RunShell(v8::Handle<v8::Context> context);
+bool ExecuteString(v8::Handle<v8::String> source,
+ v8::Handle<v8::Value> name,
+ bool print_result,
+ bool report_exceptions);
+v8::Handle<v8::Value> Print(const v8::Arguments& args);
+v8::Handle<v8::Value> Read(const v8::Arguments& args);
+v8::Handle<v8::Value> Load(const v8::Arguments& args);
+v8::Handle<v8::Value> Quit(const v8::Arguments& args);
+v8::Handle<v8::Value> Version(const v8::Arguments& args);
+v8::Handle<v8::String> ReadFile(const char* name);
+void ReportException(v8::TryCatch* handler);
+
+
+int RunMain(int argc, char* argv[]) {
+ v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
+ v8::HandleScope handle_scope;
+ // Create a template for the global object.
+ v8::Handle<v8::ObjectTemplate> global = v8::ObjectTemplate::New();
+ // Bind the global 'print' function to the C++ Print callback.
+ global->Set(v8::String::New("print"), v8::FunctionTemplate::New(Print));
+ // Bind the global 'read' function to the C++ Read callback.
+ global->Set(v8::String::New("read"), v8::FunctionTemplate::New(Read));
+ // Bind the global 'load' function to the C++ Load callback.
+ global->Set(v8::String::New("load"), v8::FunctionTemplate::New(Load));
+ // Bind the 'quit' function
+ global->Set(v8::String::New("quit"), v8::FunctionTemplate::New(Quit));
+ // Bind the 'version' function
+ global->Set(v8::String::New("version"), v8::FunctionTemplate::New(Version));
+ // Create a new execution environment containing the built-in
+ // functions
+ v8::Handle<v8::Context> context = v8::Context::New(NULL, global);
+ // Enter the newly created execution environment.
+ v8::Context::Scope context_scope(context);
+ bool run_shell = (argc == 1);
+ for (int i = 1; i < argc; i++) {
+ const char* str = argv[i];
+ if (strcmp(str, "--shell") == 0) {
+ run_shell = true;
+ } else if (strcmp(str, "-f") == 0) {
+ // Ignore any -f flags for compatibility with the other stand-
+ // alone JavaScript engines.
+ continue;
+ } else if (strncmp(str, "--", 2) == 0) {
+ printf("Warning: unknown flag %s.\nTry --help for options\n", str);
+ } else if (strcmp(str, "-e") == 0 && i + 1 < argc) {
+ // Execute argument given to -e option directly
+ v8::HandleScope handle_scope;
+ v8::Handle<v8::String> file_name = v8::String::New("unnamed");
+ v8::Handle<v8::String> source = v8::String::New(argv[i + 1]);
+ if (!ExecuteString(source, file_name, false, true))
+ return 1;
+ i++;
+ } else {
+ // Use all other arguments as names of files to load and run.
+ v8::HandleScope handle_scope;
+ v8::Handle<v8::String> file_name = v8::String::New(str);
+ v8::Handle<v8::String> source = ReadFile(str);
+ if (source.IsEmpty()) {
+ printf("Error reading '%s'\n", str);
+ return 1;
+ }
+ if (!ExecuteString(source, file_name, false, true))
+ return 1;
+ }
+ }
+ if (run_shell) RunShell(context);
+ return 0;
+}
+
+
+int main(int argc, char* argv[]) {
+ int result = RunMain(argc, argv);
+ v8::V8::Dispose();
+ return result;
+}
+
+
+// Extracts a C string from a V8 Utf8Value.
+const char* ToCString(const v8::String::Utf8Value& value) {
+ return *value ? *value : "<string conversion failed>";
+}
+
+
+// The callback that is invoked by v8 whenever the JavaScript 'print'
+// function is called. Prints its arguments on stdout separated by
+// spaces and ending with a newline.
+v8::Handle<v8::Value> Print(const v8::Arguments& args) {
+ bool first = true;
+ for (int i = 0; i < args.Length(); i++) {
+ v8::HandleScope handle_scope;
+ if (first) {
+ first = false;
+ } else {
+ printf(" ");
+ }
+ v8::String::Utf8Value str(args[i]);
+ const char* cstr = ToCString(str);
+ printf("%s", cstr);
+ }
+ printf("\n");
+ fflush(stdout);
+ return v8::Undefined();
+}
+
+
+// The callback that is invoked by v8 whenever the JavaScript 'read'
+// function is called. This function loads the content of the file named in
+// the argument into a JavaScript string.
+v8::Handle<v8::Value> Read(const v8::Arguments& args) {
+ if (args.Length() != 1) {
+ return v8::ThrowException(v8::String::New("Bad parameters"));
+ }
+ v8::String::Utf8Value file(args[0]);
+ if (*file == NULL) {
+ return v8::ThrowException(v8::String::New("Error loading file"));
+ }
+ v8::Handle<v8::String> source = ReadFile(*file);
+ if (source.IsEmpty()) {
+ return v8::ThrowException(v8::String::New("Error loading file"));
+ }
+ return source;
+}
+
+
+// The callback that is invoked by v8 whenever the JavaScript 'load'
+// function is called. Loads, compiles and executes its argument
+// JavaScript file.
+v8::Handle<v8::Value> Load(const v8::Arguments& args) {
+ for (int i = 0; i < args.Length(); i++) {
+ v8::HandleScope handle_scope;
+ v8::String::Utf8Value file(args[i]);
+ if (*file == NULL) {
+ return v8::ThrowException(v8::String::New("Error loading file"));
+ }
+ v8::Handle<v8::String> source = ReadFile(*file);
+ if (source.IsEmpty()) {
+ return v8::ThrowException(v8::String::New("Error loading file"));
+ }
+ if (!ExecuteString(source, v8::String::New(*file), false, false)) {
+ return v8::ThrowException(v8::String::New("Error executing file"));
+ }
+ }
+ return v8::Undefined();
+}
+
+
+// The callback that is invoked by v8 whenever the JavaScript 'quit'
+// function is called. Quits.
+v8::Handle<v8::Value> Quit(const v8::Arguments& args) {
+ // If not arguments are given args[0] will yield undefined which
+ // converts to the integer value 0.
+ int exit_code = args[0]->Int32Value();
+ exit(exit_code);
+ return v8::Undefined();
+}
+
+
+v8::Handle<v8::Value> Version(const v8::Arguments& args) {
+ return v8::String::New(v8::V8::GetVersion());
+}
+
+
+// Reads a file into a v8 string.
+v8::Handle<v8::String> ReadFile(const char* name) {
+ FILE* file = fopen(name, "rb");
+ if (file == NULL) return v8::Handle<v8::String>();
+
+ fseek(file, 0, SEEK_END);
+ int size = ftell(file);
+ rewind(file);
+
+ char* chars = new char[size + 1];
+ chars[size] = '\0';
+ for (int i = 0; i < size;) {
+ int read = fread(&chars[i], 1, size - i, file);
+ i += read;
+ }
+ fclose(file);
+ v8::Handle<v8::String> result = v8::String::New(chars, size);
+ delete[] chars;
+ return result;
+}
+
+
+// The read-eval-execute loop of the shell.
+void RunShell(v8::Handle<v8::Context> context) {
+ printf("V8 version %s\n", v8::V8::GetVersion());
+ static const int kBufferSize = 256;
+ while (true) {
+ char buffer[kBufferSize];
+ printf("> ");
+ char* str = fgets(buffer, kBufferSize, stdin);
+ if (str == NULL) break;
+ v8::HandleScope handle_scope;
+ ExecuteString(v8::String::New(str),
+ v8::String::New("(shell)"),
+ true,
+ true);
+ }
+ printf("\n");
+}
+
+
+// Executes a string within the current v8 context.
+bool ExecuteString(v8::Handle<v8::String> source,
+ v8::Handle<v8::Value> name,
+ bool print_result,
+ bool report_exceptions) {
+ v8::HandleScope handle_scope;
+ v8::TryCatch try_catch;
+ v8::Handle<v8::Script> script = v8::Script::Compile(source, name);
+ if (script.IsEmpty()) {
+ // Print errors that happened during compilation.
+ if (report_exceptions)
+ ReportException(&try_catch);
+ return false;
+ } else {
+ v8::Handle<v8::Value> result = script->Run();
+ if (result.IsEmpty()) {
+ // Print errors that happened during execution.
+ if (report_exceptions)
+ ReportException(&try_catch);
+ return false;
+ } else {
+ if (print_result && !result->IsUndefined()) {
+ // If all went well and the result wasn't undefined then print
+ // the returned value.
+ v8::String::Utf8Value str(result);
+ const char* cstr = ToCString(str);
+ printf("%s\n", cstr);
+ }
+ return true;
+ }
+ }
+}
+
+
+void ReportException(v8::TryCatch* try_catch) {
+ v8::HandleScope handle_scope;
+ v8::String::Utf8Value exception(try_catch->Exception());
+ const char* exception_string = ToCString(exception);
+ v8::Handle<v8::Message> message = try_catch->Message();
+ if (message.IsEmpty()) {
+ // V8 didn't provide any extra information about this error; just
+ // print the exception.
+ printf("%s\n", exception_string);
+ } else {
+ // Print (filename):(line number): (message).
+ v8::String::Utf8Value filename(message->GetScriptResourceName());
+ const char* filename_string = ToCString(filename);
+ int linenum = message->GetLineNumber();
+ printf("%s:%i: %s\n", filename_string, linenum, exception_string);
+ // Print line of source code.
+ v8::String::Utf8Value sourceline(message->GetSourceLine());
+ const char* sourceline_string = ToCString(sourceline);
+ printf("%s\n", sourceline_string);
+ // Print wavy underline (GetUnderline is deprecated).
+ int start = message->GetStartColumn();
+ for (int i = 0; i < start; i++) {
+ printf(" ");
+ }
+ int end = message->GetEndColumn();
+ for (int i = start; i < end; i++) {
+ printf("^");
+ }
+ printf("\n");
+ }
+}