MIPS: reland 16744: add context save for GenerateFastApiCall.

src/mips/macro-assembler-mips.h

 // Copyright 2012 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 830 matching lines @@
   // Enter exit frame.
   // argc - argument count to be dropped by LeaveExitFrame.
   // save_doubles - saves FPU registers on stack, currently disabled.
   // stack_space - extra stack space.
   void EnterExitFrame(bool save_doubles,
                       int stack_space = 0);
 
   // Leave the current exit frame.
   void LeaveExitFrame(bool save_doubles,
                       Register arg_count,
+                      bool restore_context,
                       bool do_return = false);

[Paul Lind, 2013/09/17 17:54:22]

To make the code more readable, I'd like to see an enum defined for this
do_return flag. Maybe EMIT_RETURN or some other name that would make sense at
the calls-site. Define the enum at the start of this file, something like this:

enum LeaveExitFrameMode {
   EMIT_RETRUN = true;
   NO_EMIT_RETURN = false;
};

Then above is bool do_return = NO_EMIT_RETURN;

[kilvadyb, 2013/09/17 18:40:42]

Done.

 
   // Get the actual activation frame alignment for target environment.
   static int ActivationFrameAlignment();
 
   // Make sure the stack is aligned. Only emits code in debug mode.
   void AssertStackIsAligned();
 
   void LoadContext(Register dst, int context_chain_length);
 
   // Conditionally load the cached Array transitioned map of type
@@ skipping 402 matching lines @@
 
   // Calls an API function.  Allocates HandleScope, extracts returned value
   // from handle and propagates exceptions.  Restores context.  stack_space
   // - space to be unwound on exit (includes the call JS arguments space and
   // the additional space allocated for the fast call).
   void CallApiFunctionAndReturn(ExternalReference function,
                                 Address function_address,
                                 ExternalReference thunk_ref,
                                 Register thunk_last_arg,
                                 int stack_space,
-                                int return_value_offset_from_fp);
+                                MemOperand return_value_operand,
+                                MemOperand* context_restore_operand);
 
   // Jump to the builtin routine.
   void JumpToExternalReference(const ExternalReference& builtin,
                                BranchDelaySlot bd = PROTECT);
 
   // Invoke specified builtin JavaScript function. Adds an entry to
   // the unresolved list if the name does not resolve.
   void InvokeBuiltin(Builtins::JavaScript id,
                      InvokeFlag flag,
                      const CallWrapper& call_wrapper = NullCallWrapper());
@@ skipping 330 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_