- Annotate instructions that load objects from the ObjectPool or Thread.

runtime/vm/instructions_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/constants_mips.h"
 #include "vm/cpu.h"
 #include "vm/instructions.h"
@@ skipping 103 matching lines @@
     ASSERT(instr->OpcodeField() == LUI);
     ASSERT(instr->RtField() == *reg);
     // Offset is signed, so add the upper 16 bits.
     offset += (instr->UImmField() << 16);
   }
   *index = ObjectPool::IndexFromOffset(offset);
   return start;
 }
 
 
+bool DecodeLoadObjectFromPoolOrThread(uword pc,
+                                      const Code& code,
+                                      Object* obj) {
+  ASSERT(code.ContainsInstructionAt(pc));
+
+  Instr* instr = Instr::At(pc);
+  if ((instr->OpcodeField() == LW)) {
+    intptr_t offset = instr->SImmField();
+    if (instr->RsField() == PP) {
+      intptr_t index = ObjectPool::IndexFromOffset(offset);
+      const ObjectPool& pool = ObjectPool::Handle(code.object_pool());
+      if (pool.InfoAt(index) == ObjectPool::kTaggedObject) {
+        *obj = pool.ObjectAt(index);
+        return true;
+      }
+    } else if (instr->RsField() == THR) {
+      return Thread::ObjectAtOffset(offset, obj);
+    }
+  }
+  // TODO(rmacnak): Sequence for loads beyond 16 bits.
+
+  return false;
+}
+
+
 RawICData* CallPattern::IcData() {
   if (ic_data_.IsNull()) {
     Register reg;
     InstructionPattern::DecodeLoadObject(ic_data_load_end_,
                                          object_pool_,
                                          &reg,
                                          &ic_data_);
     ASSERT(reg == S5);
   }
   return ic_data_.raw();
@@ skipping 124 matching lines @@
 bool ReturnPattern::IsValid() const {
   Instr* jr = Instr::At(pc_);
   return (jr->OpcodeField() == SPECIAL) &&
          (jr->FunctionField() == JR) &&
          (jr->RsField() == RA);
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS