Enable preaging of code objects when --optimize-for-size.

src/mips/full-codegen-mips.cc

 // 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 153 matching lines @@
     __ sw(a2, MemOperand(sp, receiver_offset));
     __ bind(&ok);
   }
 
   // Open a frame scope to indicate that there is a frame on the stack.  The
   // MANUAL indicates that the scope shouldn't actually generate code to set up
   // the frame (that is done below).
   FrameScope frame_scope(masm_, StackFrame::MANUAL);
 
   info->set_prologue_offset(masm_->pc_offset());
-  // The following three instructions must remain together and unmodified for
-  // code aging to work properly.
-  __ Push(ra, fp, cp, a1);
-  __ nop(Assembler::CODE_AGE_SEQUENCE_NOP);
-  // Adjust fp to point to caller's fp.
-  __ Addu(fp, sp, Operand(2 * kPointerSize));
+  {
+    PredictableCodeSizeScope predictible_code_size_scope(
+        masm_, kNoCodeAgeSequenceLength * Assembler::kInstrSize);
+    // The following three instructions must remain together and unmodified
+    // for code aging to work properly.
+    if (FLAG_optimize_for_size && FLAG_age_code) {
+      // Pre-age the code.
+      Code* stub = Code::GetPreAgedCodeAgeStub(isolate());
+      __ nop(Assembler::CODE_AGE_MARKER_NOP);
+      // Save the function's original return address
+      // (it will be clobbered by Call(t9))
+      __ mov(at, ra);
+      // Load the stub address to t9 and call it
+      __ li(t9,
+            Operand(reinterpret_cast<uint32_t>(stub->instruction_start())));
+      __ Call(t9);
+      // Record the stub address in the empty space for GetCodeAgeAndParity()
+      __ dd(reinterpret_cast<uint32_t>(stub->instruction_start()));
+    } else {
+      __ Push(ra, fp, cp, a1);
+      __ nop(Assembler::CODE_AGE_SEQUENCE_NOP);
+      // Adjust fp to point to caller's fp.
+      __ Addu(fp, sp, Operand(2 * kPointerSize));
+    }
+  }
   info->AddNoFrameRange(0, masm_->pc_offset());
 
   { Comment cmnt(masm_, "[ Allocate locals");
     int locals_count = info->scope()->num_stack_slots();
     // Generators allocate locals, if any, in context slots.
     ASSERT(!info->function()->is_generator() || locals_count == 0);
     if (locals_count > 0) {
       __ LoadRoot(at, Heap::kUndefinedValueRootIndex);
       for (int i = 0; i < locals_count; i++) {
         __ push(at);
@@ skipping 4808 matching lines @@
       Assembler::target_address_at(pc_immediate_load_address)) ==
          reinterpret_cast<uint32_t>(
              isolate->builtins()->OsrAfterStackCheck()->entry()));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS