MIPS: Add a level of indirection to exception handler addresses.

src/mips/macro-assembler-mips.h

 // 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 825 matching lines @@
   // Debugger Support.
 
   void DebugBreak();
 #endif
 
 
   // -------------------------------------------------------------------------
   // Exception handling.
 
   // Push a new try handler and link into try handler chain.
-  // The return address must be passed in register ra.
-  // Clobber t0, t1, t2.
-  void PushTryHandler(CodeLocation try_location, HandlerType type);
+  void PushTryHandler(CodeLocation try_location,
+                      HandlerType type,
+                      int handler_index);
 
   // Unlink the stack handler on top of the stack from the try handler chain.
   // Must preserve the result register.
   void PopTryHandler();
 
   // Passes thrown value (in v0) to the handler of top of the try handler chain.
   void Throw(Register value);
 
   // Propagates an uncatchable exception to the top of the current JS stack's
   // handler chain.
@@ skipping 515 matching lines @@
                   Condition cond,  // eq for new space, ne otherwise.
                   Label* branch);
 
   // Helper for finding the mark bits for an address.  Afterwards, the
   // bitmap register points at the word with the mark bits and the mask
   // the position of the first bit.  Leaves addr_reg unchanged.
   inline void GetMarkBits(Register addr_reg,
                           Register bitmap_reg,
                           Register mask_reg);
 
+  // Helper for throwing exceptions.  Compute a handler address and jump to
+  // it.  See the implementation for register usage.
+  void JumpToHandlerEntry();
+
   // Compute memory operands for safepoint stack slots.
   static int SafepointRegisterStackIndex(int reg_code);
   MemOperand SafepointRegisterSlot(Register reg);
   MemOperand SafepointRegistersAndDoublesSlot(Register reg);
 
   bool generating_stub_;
   bool allow_stub_calls_;
   bool has_frame_;
   // This handle will be patched with the code object on installation.
   Handle<Object> code_object_;
@@ skipping 41 matching lines @@
 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 } }  // namespace v8::internal
 
 #endif  // V8_MIPS_MACRO_ASSEMBLER_MIPS_H_