[Isolates] Allow running multiple isolates in shell and use this in tests.

samples/shell.cc

 // 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
@@ skipping 13 matching lines @@
 // 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>
 
+// TODO(isolates):
+//   o Add thread implementation for more platforms.
+//   o Do not assume not WIN32 implies pthreads.
+#ifndef WIN32
+#include <pthread.h>
+#endif
 
+v8::Handle<v8::Context> CreateShellContext();
 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);
 
 
+#ifndef WIN32
+void* IsolateThreadEntry(void* arg);
+#endif
+
+class SourceGroup {
+ public:
+  SourceGroup() : argv_(NULL), begin_offset_(0), end_offset_(0) {
+#ifndef WIN32
+    thread_ = 0;
+#endif
+  }
+
+  void Begin(char** argv, int offset) {
+    argv_ = const_cast<const char**>(argv);
+    begin_offset_ = offset;
+  }
+
+  void End(int offset) { end_offset_ = offset; }
+
+  void Execute() {
+    for (int i = begin_offset_; i < end_offset_; ++i) {
+      const char* arg = argv_[i];
+      if (strcmp(arg, "-e") == 0 && i + 1 < end_offset_) {
+        // 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)) {
+          exit(1);
+          return;
+        }
+        ++i;
+      } else if (arg[0] == '-') {
+        // Ignore other options. They have been parsed already.
+      } 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(arg);
+        v8::Handle<v8::String> source = ReadFile(arg);
+        if (source.IsEmpty()) {
+          printf("Error reading '%s'\n", arg);
+        }
+        if (!ExecuteString(source, file_name, false, true)) {

[yurys, 2010/10/06 14:52:58]

This code can be extracted out of the if/else expression.

+          exit(1);
+          return;
+        }
+      }
+    }
+  }
+
+#ifdef WIN32
+  void StartExecuteInThread() { ExecuteInThread(); }
+  void WaitForThread() {}
+
+#else
+  void StartExecuteInThread() {
+    pthread_create(&thread_, NULL, &IsolateThreadEntry, this);
+  }
+
+  void WaitForThread() {
+    if (thread_ == 0) return;
+    pthread_join(thread_, NULL);
+    thread_ = 0;
+  }
+#endif  // WIN32
+
+ private:
+  void ExecuteInThread() {
+    v8::Isolate* isolate = v8::Isolate::New();
+    {
+      v8::Isolate::Scope iscope(isolate);
+      v8::HandleScope scope;
+      v8::Context::Scope cscope(CreateShellContext());
+      Execute();
+    }
+    isolate->Dispose();
+  }
+
+  const char** argv_;
+  int begin_offset_;
+  int end_offset_;
+#ifndef WIN32
+  pthread_t thread_;
+#endif
+
+  friend void* IsolateThreadEntry(void* arg);
+};
+
+#ifndef WIN32
+void* IsolateThreadEntry(void* arg) {

[yurys, 2010/10/06 14:52:58]

This function can be made a private static method on SourceGroup.

+  reinterpret_cast<SourceGroup*>(arg)->ExecuteInThread();
+  return NULL;
+}
+#endif
+
+
 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);
+  v8::Handle<v8::Context> context = CreateShellContext();
   // Enter the newly created execution environment.
   v8::Context::Scope context_scope(context);
   bool run_shell = (argc == 1);
+  int num_isolates = 1;
+  for (int i = 1; i < argc; i++) {
+    if (strcmp(argv[i], "--isolate") == 0) ++num_isolates;
+  }
+  SourceGroup* isolate_sources = new SourceGroup[num_isolates];
+  SourceGroup* current = isolate_sources;
+  current->Begin(argv, 1);
   for (int i = 1; i < argc; i++) {
     const char* str = argv[i];
-    if (strcmp(str, "--shell") == 0) {
+    if (strcmp(str, "--isolate") == 0) {
+      current->End(i);
+      current++;
+      current->Begin(argv, i + 1);
+    } else 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;
     }
   }
+  current->End(argc);
+  for (int i = 1; i < num_isolates; ++i) {
+    isolate_sources[i].StartExecuteInThread();
+  }
+  isolate_sources[0].Execute();
   if (run_shell) RunShell(context);
+  for (int i = 1; i < num_isolates; ++i) {
+    isolate_sources[i].WaitForThread();
+  }

[yurys, 2010/10/06 14:52:58]

Should we delete isolate_sources before exit here?

   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>";
 }
 
 
+// Creates a new execution environment containing the built-in
+// functions.
+v8::Handle<v8::Context> CreateShellContext() {
+  // 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));
+  return v8::Context::New(NULL, global);
+}
+
+
 // 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 {
@@ skipping 170 matching lines @@
       printf("^");
     }
     printf("\n");
     v8::String::Utf8Value stack_trace(try_catch->StackTrace());
     if (stack_trace.length() > 0) {
       const char* stack_trace_string = ToCString(stack_trace);
       printf("%s\n", stack_trace_string);
     }
   }
 }