[builtins] support exception handling in TFJ builtins

src/compiler/code-assembler.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_COMPILER_CODE_ASSEMBLER_H_
 #define V8_COMPILER_CODE_ASSEMBLER_H_
 
 #include <map>
 #include <memory>
 
@@ skipping 391 matching lines @@
   Node* CallJS(Callable const& callable, Node* context, Node* function,
                Node* receiver, size_t result_size = 1);
   Node* CallJS(Callable const& callable, Node* context, Node* function,
                Node* receiver, Node* arg1, size_t result_size = 1);
   Node* CallJS(Callable const& callable, Node* context, Node* function,
                Node* receiver, Node* arg1, Node* arg2, size_t result_size = 1);
 
   // Branching helpers.
   void BranchIf(Node* condition, Label* if_true, Label* if_false);
 
+  void GotoIfException(Node* node, Label* if_exception,

[Michael Starzinger, 2016/08/19 18:37:43]

nit: Lets move this up one function to not have it sit in between the branching
helpers. Also maybe add a "// Exception handling support." comment.

[caitp, 2016/08/19 20:37:11]

done

+                       Variable* exception_var = nullptr);
+
 #define BRANCH_HELPER(name)                                                \
   void BranchIf##name(Node* a, Node* b, Label* if_true, Label* if_false) { \
     BranchIf(name(a, b), if_true, if_false);                               \
   }
   CODE_ASSEMBLER_COMPARE_BINARY_OP_LIST(BRANCH_HELPER)
 #undef BRANCH_HELPER
 
   // Helpers which delegate to RawMachineAssembler.
   Factory* factory() const;
   Isolate* isolate() const;
@@ skipping 52 matching lines @@
   // Map of variables to the list of value nodes that have been added from each
   // merge path in their order of merging.
   std::map<Variable::Impl*, std::vector<Node*>> variable_merges_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_CODE_ASSEMBLER_H_