Implements intrinsics for MIPS.

runtime/vm/assembler_mips.cc

Index: runtime/vm/assembler_mips.cc
===================================================================
--- runtime/vm/assembler_mips.cc	(revision 23484)
+++ runtime/vm/assembler_mips.cc	(working copy)
@@ -16,8 +16,8 @@
 DECLARE_FLAG(bool, trace_sim);
 #endif
 DEFINE_FLAG(bool, print_stop_message, false, "Print stop message.");
+DECLARE_FLAG(bool, inline_alloc);
 
-
 void Assembler::InitializeMemoryWithBreakpoints(uword data, int length) {
   ASSERT(Utils::IsAligned(data, 4));
   ASSERT(Utils::IsAligned(length, 4));
@@ -397,6 +397,43 @@
 }
 
 
+void Assembler::TryAllocate(const Class& cls,
+                            Label* failure,
+                            Register instance_reg) {
+  ASSERT(failure != NULL);
+  if (FLAG_inline_alloc) {
+    Heap* heap = Isolate::Current()->heap();
+    const intptr_t instance_size = cls.instance_size();
+    LoadImmediate(instance_reg, heap->TopAddress());
+    lw(instance_reg, Address(instance_reg, 0));
+    AddImmediate(instance_reg, instance_size);
+
+    // instance_reg: potential next object start.
+    LoadImmediate(TMP, heap->EndAddress());
+    lw(TMP, Address(TMP, 0));
+    // Fail if heap end unsigned less than or equal to instance_reg.
+    BranchUnsignedLessEqual(TMP, instance_reg, failure);
+
+    // Successfully allocated the object, now update top to point to
+    // next object start and store the class in the class field of object.
+    LoadImmediate(TMP, heap->TopAddress());
+    sw(instance_reg, Address(TMP, 0));
+
+    ASSERT(instance_size >= kHeapObjectTag);
+    AddImmediate(instance_reg, -instance_size + kHeapObjectTag);
+
+    uword tags = 0;
+    tags = RawObject::SizeTag::update(instance_size, tags);
+    ASSERT(cls.id() != kIllegalCid);
+    tags = RawObject::ClassIdTag::update(cls.id(), tags);
+    LoadImmediate(TMP, tags);
+    sw(TMP, FieldAddress(instance_reg, Object::tags_offset()));
+  } else {
+    b(failure);
+  }
+}
+
+
 void Assembler::CallRuntime(const RuntimeEntry& entry) {
   entry.Call(this);
 }