Implement safepointing of threads

runtime/vm/intermediate_language_x64.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"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/compiler.h"
@@ skipping 757 matching lines @@
 LocationSummary* NativeCallInstr::MakeLocationSummary(Zone* zone,
                                                       bool opt) const {
   return MakeCallSummary(zone);
 }
 
 
 void NativeCallInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   SetupNative();
   Register result = locs()->out(0).reg();
   const intptr_t argc_tag = NativeArguments::ComputeArgcTag(function());
-  const bool is_leaf_call =
-      (argc_tag & NativeArguments::AutoSetupScopeMask()) == 0;
 
   // Push the result place holder initialized to NULL.
   __ PushObject(Object::null_object());
   // Pass a pointer to the first argument in RAX.
   if (!function().HasOptionalParameters()) {
     __ leaq(RAX, Address(RBP, (kParamEndSlotFromFp +
                                function().NumParameters()) * kWordSize));
   } else {
     __ leaq(RAX, Address(RBP, kFirstLocalSlotFromFp * kWordSize));
   }
   __ LoadImmediate(R10, Immediate(argc_tag));
   const StubEntry* stub_entry;
   if (link_lazily()) {
     stub_entry = StubCode::CallBootstrapCFunction_entry();
     ExternalLabel label(NativeEntry::LinkNativeCallEntry());
     __ LoadNativeEntry(RBX, &label, kPatchable);
   } else {
-    stub_entry = (is_bootstrap_native() || is_leaf_call)
-        ? StubCode::CallBootstrapCFunction_entry()
-        : StubCode::CallNativeCFunction_entry();
+    stub_entry = (is_bootstrap_native()) ?
+        StubCode::CallBootstrapCFunction_entry() :
+        StubCode::CallNativeCFunction_entry();
     const ExternalLabel label(reinterpret_cast<uword>(native_c_function()));
     __ LoadNativeEntry(RBX, &label, kNotPatchable);
   }
   compiler->GenerateCall(token_pos(),
                          *stub_entry,
                          RawPcDescriptors::kOther,
                          locs());
   __ popq(result);
 }
 
@@ skipping 5642 matching lines @@
   __ Drop(1);
   __ popq(result);
 }
 
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_X64