Runtime support for evaluation of static field initializer expressions

runtime/vm/intermediate_language_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/intermediate_language.h"
 
 #include "vm/dart_entry.h"
@@ skipping 2369 matching lines @@
   __ LoadImmediate(T1, num_context_variables());
   StubCode* stub_code = compiler->isolate()->stub_code();
   const ExternalLabel label(stub_code->AllocateContextEntryPoint());
   compiler->GenerateCall(token_pos(),
                          &label,
                          RawPcDescriptors::kOther,
                          locs());
 }
 
 
+LocationSummary* InitStaticFieldInstr::MakeLocationSummary(Isolate* isolate,
+                                                           bool opt) const {
+  const intptr_t kNumInputs = 1;
+  const intptr_t kNumTemps = 1;
+  LocationSummary* locs = new(isolate) LocationSummary(
+      isolate, kNumInputs, kNumTemps, LocationSummary::kCall);
+  locs->set_in(0, Location::RegisterLocation(T0));
+  locs->set_out(0, Location::RegisterLocation(T0));

[zra, 2014/08/18 15:56:09]

If this should be the function result register for the result of the runtime
call, then use V0 here.

[hausner, 2014/08/19 17:19:14]

Done.

+  locs->set_temp(0, Location::RegisterLocation(T1));
+  return locs;
+}
+
+
+void InitStaticFieldInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
+  Register field = locs()->in(0).reg();
+  Register temp = locs()->temp(0).reg();
+
+  Label call_runtime, no_call;
+  __ TraceSimMsg("InitStaticFieldInstr");
+
+  __ lw(temp, FieldAddress(field, Field::value_offset()));
+  __ BranchEqual(temp, Object::sentinel(), &call_runtime);
+  __ BranchNotEqual(temp, Object::transition_sentinel(), &no_call);
+
+  __ Bind(&call_runtime);
+  __ addiu(SP, SP, Immediate(-2 * kWordSize));
+  __ LoadObject(TMP, Object::null_object());
+  __ sw(TMP, Address(SP, 1 * kWordSize));   // Make room for (unused) result.
+  __ sw(field, Address(SP, 0 * kWordSize));
+
+  compiler->GenerateRuntimeCall(token_pos(),
+                                deopt_id(),
+                                kInitStaticFieldRuntimeEntry,
+                                1,
+                                locs());
+
+  __ addiu(SP, SP, Immediate(2 * kWordSize));  // Purge argument and result.
+
+  __ Bind(&no_call);
+}
+
+
 LocationSummary* CloneContextInstr::MakeLocationSummary(Isolate* isolate,
                                                         bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* locs = new(isolate) LocationSummary(
       isolate, kNumInputs, kNumTemps, LocationSummary::kCall);
   locs->set_in(0, Location::RegisterLocation(T0));
   locs->set_out(0, Location::RegisterLocation(T0));
   return locs;
 }
@@ skipping 2438 matching lines @@
   compiler->GenerateCall(token_pos(), &label, stub_kind_, locs());
 #if defined(DEBUG)
   __ LoadImmediate(S4, kInvalidObjectPointer);
   __ LoadImmediate(S5, kInvalidObjectPointer);
 #endif
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS