Move compilation error handling into a separate class.

src/pending-compilation-error-handler.h

+// Copyright 2015 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.
+
+#ifndef V8_PENDING_COMPILATION_ERROR_HANDLER_H_
+#define V8_PENDING_COMPILATION_ERROR_HANDLER_H_
+
+#include "src/base/macros.h"
+#include "src/globals.h"
+
+namespace v8 {
+namespace internal {
+
+class AstRawString;
+template <class T>
+class Handle;
+class Isolate;
+class Script;
+
+// Helper class for handling pending compilation errors consistently in various
+// compilation phases.
+class PendingCompilationErrorHandler {
+ public:
+  PendingCompilationErrorHandler()
+      : has_pending_error_(false),
+        start_position_(-1),
+        end_position_(-1),
+        message_(nullptr),
+        arg_(nullptr),
+        char_arg_(nullptr),
+        error_type_(kSyntaxError) {}
+
+  void ReportMessageAt(int start_position, int end_position,
+                       const char* message, const char* arg = nullptr,
+                       ParseErrorType error_type = kSyntaxError) {
+    if (has_pending_error_) return;
+    has_pending_error_ = true;
+    start_position_ = start_position;
+    end_position_ = end_position;
+    message_ = message;
+    char_arg_ = arg;
+    arg_ = nullptr;
+    error_type_ = error_type;
+  }
+
+  void ReportMessageAt(int start_position, int end_position,
+                       const char* message, const AstRawString* arg,
+                       ParseErrorType error_type = kSyntaxError) {
+    if (has_pending_error_) return;
+    has_pending_error_ = true;
+    start_position_ = start_position;
+    end_position_ = end_position;
+    message_ = message;
+    char_arg_ = nullptr;
+    arg_ = arg;
+    error_type_ = error_type;
+  }
+
+  bool has_pending_error() const { return has_pending_error_; }
+
+  void ThrowPendingError(Isolate* isolate, Handle<Script> script);
+
+ private:
+  bool has_pending_error_;
+  int start_position_;
+  int end_position_;
+  const char* message_;
+  const AstRawString* arg_;
+  const char* char_arg_;
+  ParseErrorType error_type_;
+
+  DISALLOW_COPY_AND_ASSIGN(PendingCompilationErrorHandler);
+};
+
+}  // namespace internal
+}  // namespace v8
+#endif  // V8_PENDING_COMPILATION_ERROR_HANDLER_H_