Use CallBootstrapC stub for leaf native calls.

runtime/vm/stub_code_mips.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/assembler.h"
 #include "vm/code_generator.h"
 #include "vm/compiler.h"
@@ skipping 211 matching lines @@
   // Passing the structure by value as in runtime calls would require changing
   // Dart API for native functions.
   // For now, space is reserved on the stack and we pass a pointer to it.
   __ addiu(SP, SP, Immediate(-4 * kWordSize));
   __ sw(A3, Address(SP, 3 * kWordSize));
   __ sw(A2, Address(SP, 2 * kWordSize));
   __ sw(A1, Address(SP, 1 * kWordSize));
   __ sw(A0, Address(SP, 0 * kWordSize));
   __ mov(A0, SP);  // Pass the pointer to the NativeArguments.
 
-  // Call native function (setup scope if not leaf function).
-  Label leaf_call;
-  Label done;
-  __ AndImmediate(CMPRES1, A1, NativeArguments::AutoSetupScopeMask());
-  __ beq(CMPRES1, ZR, &leaf_call);
 
   __ mov(A1, T5);  // Pass the function entrypoint.
   __ ReserveAlignedFrameSpace(2 * kWordSize);  // Just passing A0, A1.
   // Call native wrapper function or redirection via simulator.
 #if defined(USING_SIMULATOR)
   uword entry = reinterpret_cast<uword>(NativeEntry::NativeCallWrapper);
   entry = Simulator::RedirectExternalReference(
       entry, Simulator::kNativeCall, NativeEntry::kNumCallWrapperArguments);
   __ LoadImmediate(T9, entry);
   __ jalr(T9);
 #else
   __ BranchLink(&NativeEntry::NativeCallWrapperLabel());
 #endif
   __ TraceSimMsg("CallNativeCFunctionStub return");
-  __ b(&done);
-
-  __ Bind(&leaf_call);
-  // Call native function or redirection via simulator.
-  __ ReserveAlignedFrameSpace(kWordSize);  // Just passing A0.
-
-
-  // We defensively always jalr through T9 because it is sometimes required by
-  // the MIPS ABI.
-  __ mov(T9, T5);
-  __ jalr(T9);
-
-  __ Bind(&done);
 
   // Mark that the isolate is executing Dart code.
   __ LoadImmediate(A2, VMTag::kScriptTagId);
   __ sw(A2, Address(CTX, Isolate::vm_tag_offset()));
 
   // Reset exit frame information in Isolate structure.
   __ sw(ZR, Address(CTX, Isolate::top_exit_frame_info_offset()));
 
   // Load Context pointer from Isolate structure into A2.
   __ lw(A2, Address(CTX, Isolate::top_context_offset()));
@@ skipping 1805 matching lines @@
   const Register right = T0;
   __ lw(left, Address(SP, 1 * kWordSize));
   __ lw(right, Address(SP, 0 * kWordSize));
   GenerateIdenticalWithNumberCheckStub(assembler, left, right, temp1, temp2);
   __ Ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS