Introduce a lazy-compile stub for functions.

runtime/vm/flow_graph_compiler_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"  // Needed here to get TARGET_ARCH_MIPS.
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 1302 matching lines @@
   __ bne(T4, T0, &update);
 
   __ Bind(&call_target_function);
   // Call the target found in the cache.  For a class id match, this is a
   // proper target for the given name and arguments descriptor.  If the
   // illegal class id was found, the target is a cache miss handler that can
   // be invoked as a normal Dart function.
   __ sll(T1, T3, 2);
   __ addu(T1, T2, T1);
   __ lw(T0, FieldAddress(T1, base + kWordSize));
+
   __ lw(T1, FieldAddress(T0, Function::code_offset()));
-  if (FLAG_collect_code) {
-    // If we are collecting code, the code object may be null.
-    Label is_compiled;
-    __ BranchNotEqual(T1, reinterpret_cast<int32_t>(Object::null()),
-                      &is_compiled);
-    __ BranchLink(&StubCode::CompileFunctionRuntimeCallLabel());
-    AddCurrentDescriptor(PcDescriptors::kRuntimeCall,
-                         Isolate::kNoDeoptId,
-                         token_pos);
-    RecordSafepoint(locs);
-    __ lw(T1, FieldAddress(T0, Function::code_offset()));
-    __ Bind(&is_compiled);
-  }
-  __ lw(T0, FieldAddress(T1, Code::instructions_offset()));
+  __ lw(T1, FieldAddress(T1, Code::instructions_offset()));
   __ LoadObject(S5, ic_data);
   __ LoadObject(S4, arguments_descriptor);
-  __ AddImmediate(T0, Instructions::HeaderSize() - kHeapObjectTag);
-  __ jalr(T0);
+  __ AddImmediate(T1, Instructions::HeaderSize() - kHeapObjectTag);
+  __ jalr(T1);
   AddCurrentDescriptor(PcDescriptors::kOther, Isolate::kNoDeoptId, token_pos);
   RecordSafepoint(locs);
   AddDeoptIndexAtCall(Isolate::ToDeoptAfter(deopt_id), token_pos);
   __ Drop(argument_count);
 }
 
 
 void FlowGraphCompiler::EmitUnoptimizedStaticCall(
     const Function& target_function,
     const Array& arguments_descriptor,
@@ skipping 505 matching lines @@
   __ AddImmediate(SP, kDoubleSize);
 }
 
 
 #undef __
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS