VM: Link native calls lazily.

runtime/vm/intermediate_language_ia32.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_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/dart_entry.h"
@@ skipping 810 matching lines @@
 
   // Push the result place holder initialized to NULL.
   __ PushObject(Object::null_object());
   // Pass a pointer to the first argument in EAX.
   if (!function().HasOptionalParameters()) {
     __ leal(EAX, Address(EBP, (kParamEndSlotFromFp +
                                function().NumParameters()) * kWordSize));
   } else {
     __ leal(EAX, Address(EBP, kFirstLocalSlotFromFp * kWordSize));
   }
-  __ movl(ECX, Immediate(reinterpret_cast<uword>(native_c_function())));
   __ movl(EDX, Immediate(argc_tag));
-  const StubEntry* stub_entry = (is_bootstrap_native() || is_leaf_call) ?
-      StubCode::CallBootstrapCFunction_entry() :
-      StubCode::CallNativeCFunction_entry();
+
+  const StubEntry* stub_entry;
+  if (link_lazily()) {
+    stub_entry = StubCode::CallBootstrapCFunction_entry();
+    __ movl(ECX, Immediate(NativeEntry::LinkNativeCallLabel().address()));
+  } else {
+    stub_entry = (is_bootstrap_native() || is_leaf_call) ?
+        StubCode::CallBootstrapCFunction_entry() :
+        StubCode::CallNativeCFunction_entry();
+    const ExternalLabel label(reinterpret_cast<uword>(native_c_function()));
+    __ movl(ECX, Immediate(label.address()));
+  }
   compiler->GenerateCall(token_pos(),
                          *stub_entry,
                          RawPcDescriptors::kOther,
                          locs());
   __ popl(result);
 }
 
 
 static bool CanBeImmediateIndex(Value* value, intptr_t cid) {
   ConstantInstr* constant = value->definition()->AsConstant();
@@ skipping 6012 matching lines @@
   __ Drop(1);
   __ popl(result);
 }
 
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_IA32