Add a level of indirection to exception handler addresses.

src/parser.cc

 // Copyright 2011 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 475 matching lines @@
   FunctionState(Parser* parser, Scope* scope, Isolate* isolate);
   ~FunctionState();
 
   int NextMaterializedLiteralIndex() {
     return next_materialized_literal_index_++;
   }
   int materialized_literal_count() {
     return next_materialized_literal_index_ - JSFunction::kLiteralsPrefixSize;
   }
 
+  int NextHandlerIndex() { return next_handler_index_++; }
+  int handler_count() { return next_handler_index_; }
+
   void SetThisPropertyAssignmentInfo(
       bool only_simple_this_property_assignments,
       Handle<FixedArray> this_property_assignments) {
     only_simple_this_property_assignments_ =
         only_simple_this_property_assignments;
     this_property_assignments_ = this_property_assignments;
   }
   bool only_simple_this_property_assignments() {
     return only_simple_this_property_assignments_;
   }
   Handle<FixedArray> this_property_assignments() {
     return this_property_assignments_;
   }
 
   void AddProperty() { expected_property_count_++; }
   int expected_property_count() { return expected_property_count_; }
 
  private:
   // Used to assign an index to each literal that needs materialization in
   // the function.  Includes regexp literals, and boilerplate for object and
   // array literals.
   int next_materialized_literal_index_;
 
+  // Used to assign a per-function index to try and catch handlers.
+  int next_handler_index_;
+
   // Properties count estimation.
   int expected_property_count_;
 
   // Keeps track of assignments to properties of this. Used for
   // optimizing constructors.
   bool only_simple_this_property_assignments_;
   Handle<FixedArray> this_property_assignments_;
 
   Parser* parser_;
   FunctionState* outer_function_state_;
   Scope* outer_scope_;
   unsigned saved_ast_node_id_;
 };
 
 
 Parser::FunctionState::FunctionState(Parser* parser,
                                      Scope* scope,
                                      Isolate* isolate)
     : next_materialized_literal_index_(JSFunction::kLiteralsPrefixSize),
+      next_handler_index_(0),
       expected_property_count_(0),
       only_simple_this_property_assignments_(false),
       this_property_assignments_(isolate->factory()->empty_fixed_array()),
       parser_(parser),
       outer_function_state_(parser->current_function_state_),
       outer_scope_(parser->top_scope_),
       saved_ast_node_id_(isolate->ast_node_id()) {
   parser->top_scope_ = scope;
   parser->current_function_state_ = this;
   isolate->set_ast_node_id(AstNode::kDeclarationsId + 1);
@@ skipping 34 matching lines @@
                bool allow_natives_syntax,
                v8::Extension* extension,
                ScriptDataImpl* pre_data)
     : isolate_(script->GetIsolate()),
       symbol_cache_(pre_data ? pre_data->symbol_count() : 0),
       script_(script),
       scanner_(isolate_->unicode_cache()),
       top_scope_(NULL),
       current_function_state_(NULL),
       target_stack_(NULL),
-      allow_natives_syntax_(allow_natives_syntax),
       extension_(extension),
       pre_data_(pre_data),
       fni_(NULL),
+      allow_natives_syntax_(allow_natives_syntax),
       stack_overflow_(false),
       parenthesized_function_(false),
       harmony_scoping_(false) {
   AstNode::ResetIds();
 }
 
 
 FunctionLiteral* Parser::ParseProgram(Handle<String> source,
                                       bool in_global_context,
                                       StrictModeFlag strict_mode) {
@@ skipping 56 matching lines @@
     }
 
     if (ok) {
       result = new(zone()) FunctionLiteral(
           isolate(),
           no_name,
           top_scope_,
           body,
           function_state.materialized_literal_count(),
           function_state.expected_property_count(),
+          function_state.handler_count(),
           function_state.only_simple_this_property_assignments(),
           function_state.this_property_assignments(),
           0,
           FunctionLiteral::ANONYMOUS_EXPRESSION,
           false);  // Does not have duplicate parameters.
     } else if (stack_overflow_) {
       isolate()->StackOverflow();
     }
   }
 
@@ skipping 1627 matching lines @@
   }
 
   // Simplify the AST nodes by converting:
   //   'try B0 catch B1 finally B2'
   // to:
   //   'try { try B0 catch B1 } finally B2'
 
   if (catch_block != NULL && finally_block != NULL) {
     // If we have both, create an inner try/catch.
     ASSERT(catch_scope != NULL && catch_variable != NULL);
-    TryCatchStatement* statement =
-        new(zone()) TryCatchStatement(try_block,
-                                      catch_scope,
-                                      catch_variable,
-                                      catch_block);
+    int index = current_function_state_->NextHandlerIndex();
+    TryCatchStatement* statement = new(zone()) TryCatchStatement(index,
+                                                                 try_block,
+                                                                 catch_scope,
+                                                                 catch_variable,
+                                                                 catch_block);
     statement->set_escaping_targets(try_collector.targets());
     try_block = new(zone()) Block(isolate(), NULL, 1, false);
     try_block->AddStatement(statement);
     catch_block = NULL;  // Clear to indicate it's been handled.
   }
 
   TryStatement* result = NULL;
   if (catch_block != NULL) {
     ASSERT(finally_block == NULL);
     ASSERT(catch_scope != NULL && catch_variable != NULL);
-    result =
-        new(zone()) TryCatchStatement(try_block,
-                                      catch_scope,
-                                      catch_variable,
-                                      catch_block);
+    int index = current_function_state_->NextHandlerIndex();
+    result = new(zone()) TryCatchStatement(index,
+                                           try_block,
+                                           catch_scope,
+                                           catch_variable,
+                                           catch_block);
   } else {
     ASSERT(finally_block != NULL);
-    result = new(zone()) TryFinallyStatement(try_block, finally_block);
+    int index = current_function_state_->NextHandlerIndex();
+    result = new(zone()) TryFinallyStatement(index,
+                                             try_block,
+                                             finally_block);
     // Combine the jump targets of the try block and the possible catch block.
     try_collector.targets()->AddAll(*catch_collector.targets());
   }
 
   result->set_escaping_targets(try_collector.targets());
   return result;
 }
 
 
 DoWhileStatement* Parser::ParseDoWhileStatement(ZoneStringList* labels,
@@ skipping 1538 matching lines @@
     function_name = isolate()->factory()->empty_symbol();
   }
 
   int num_parameters = 0;
   // Function declarations are function scoped in normal mode, so they are
   // hoisted. In harmony block scoping mode they are block scoped, so they
   // are not hoisted.
   Scope* scope = (type == FunctionLiteral::DECLARATION && !harmony_scoping_)
       ? NewScope(top_scope_->DeclarationScope(), FUNCTION_SCOPE)
       : NewScope(top_scope_, FUNCTION_SCOPE);
-  ZoneList<Statement*>* body = new(zone()) ZoneList<Statement*>(8);
+  ZoneList<Statement*>* body = NULL;
   int materialized_literal_count;
   int expected_property_count;
+  int handler_count = 0;
   bool only_simple_this_property_assignments;
   Handle<FixedArray> this_property_assignments;
   bool has_duplicate_parameters = false;
   // Parse function body.
   { FunctionState function_state(this, scope, isolate());
     top_scope_->SetScopeName(function_name);
 
     //  FormalParameterList ::
     //    '(' (Identifier)*[','] ')'
     Expect(Token::LPAREN, CHECK_OK);
@@ skipping 35 matching lines @@
     Expect(Token::RPAREN, CHECK_OK);
 
     Expect(Token::LBRACE, CHECK_OK);
 
     // If we have a named function expression, we add a local variable
     // declaration to the body of the function with the name of the
     // function and let it refer to the function itself (closure).
     // NOTE: We create a proxy and resolve it here so that in the
     // future we can change the AST to only refer to VariableProxies
     // instead of Variables and Proxis as is the case now.
+    Variable* fvar = NULL;
+    Token::Value fvar_init_op = Token::INIT_CONST;
     if (type == FunctionLiteral::NAMED_EXPRESSION) {
       VariableMode fvar_mode;
-      Token::Value fvar_init_op;
       if (harmony_scoping_) {
         fvar_mode = CONST_HARMONY;
         fvar_init_op = Token::INIT_CONST_HARMONY;
       } else {
         fvar_mode = CONST;
-        fvar_init_op = Token::INIT_CONST;
       }
-      Variable* fvar = top_scope_->DeclareFunctionVar(function_name, fvar_mode);
-      VariableProxy* fproxy = top_scope_->NewUnresolved(function_name);
-      fproxy->BindTo(fvar);
-      body->Add(new(zone()) ExpressionStatement(
-          new(zone()) Assignment(isolate(),
-                                 fvar_init_op,
-                                 fproxy,
-                                 new(zone()) ThisFunction(isolate()),
-                                 RelocInfo::kNoPosition)));
+      fvar = top_scope_->DeclareFunctionVar(function_name, fvar_mode);
     }
 
     // Determine if the function will be lazily compiled. The mode can only
     // be PARSE_LAZILY if the --lazy flag is true.  We will not lazily
     // compile if we do not have preparser data for the function.
     bool is_lazily_compiled = (mode() == PARSE_LAZILY &&
                                top_scope_->outer_scope()->is_global_scope() &&
                                top_scope_->HasTrivialOuterContext() &&
                                !parenthesized_function_ &&
                                pre_data() != NULL);
@@ skipping 19 matching lines @@
         materialized_literal_count = entry.literal_count();
         expected_property_count = entry.property_count();
         top_scope_->SetStrictModeFlag(entry.strict_mode_flag());
         only_simple_this_property_assignments = false;
         this_property_assignments = isolate()->factory()->empty_fixed_array();
         Expect(Token::RBRACE, CHECK_OK);
       }
     }
 
     if (!is_lazily_compiled) {
+      body = new(zone()) ZoneList<Statement*>(8);
+      if (fvar != NULL) {
+        VariableProxy* fproxy = top_scope_->NewUnresolved(function_name);
+        fproxy->BindTo(fvar);
+        body->Add(new(zone()) ExpressionStatement(
+            new(zone()) Assignment(isolate(),
+                                   fvar_init_op,
+                                   fproxy,
+                                   new(zone()) ThisFunction(isolate()),
+                                   RelocInfo::kNoPosition)));
+      }
       ParseSourceElements(body, Token::RBRACE, CHECK_OK);
 
       materialized_literal_count = function_state.materialized_literal_count();
       expected_property_count = function_state.expected_property_count();
+      handler_count = function_state.handler_count();
       only_simple_this_property_assignments =
           function_state.only_simple_this_property_assignments();
       this_property_assignments = function_state.this_property_assignments();
 
       Expect(Token::RBRACE, CHECK_OK);
       scope->set_end_position(scanner().location().end_pos);
     }
 
     // Validate strict mode.
     if (top_scope_->is_strict_mode()) {
@@ skipping 47 matching lines @@
     CheckConflictingVarDeclarations(scope, CHECK_OK);
   }
 
   FunctionLiteral* function_literal =
       new(zone()) FunctionLiteral(isolate(),
                                   function_name,
                                   scope,
                                   body,
                                   materialized_literal_count,
                                   expected_property_count,
+                                  handler_count,
                                   only_simple_this_property_assignments,
                                   this_property_assignments,
                                   num_parameters,
                                   type,
                                   has_duplicate_parameters);
   function_literal->set_function_token_position(function_token_position);
 
   if (fni_ != NULL && should_infer_name) fni_->AddFunction(function_literal);
   return function_literal;
 }
@@ skipping 1321 matching lines @@
       result = parser.ParseProgram(source,
                                    info->is_global(),
                                    info->strict_mode_flag());
     }
   }
   info->SetFunction(result);
   return (result != NULL);
 }
 
 } }  // namespace v8::internal