Intrinsify UserTag operations on all architectures

runtime/vm/intrinsifier_ia32.cc

Index: runtime/vm/intrinsifier_ia32.cc
diff --git a/runtime/vm/intrinsifier_ia32.cc b/runtime/vm/intrinsifier_ia32.cc
index 6b4b5d281f0ad52fabeb1222f156ce9a27431e5c..cbf7d003844c87a3eacb985952be25fb0a433533 100644
--- a/runtime/vm/intrinsifier_ia32.cc
+++ b/runtime/vm/intrinsifier_ia32.cc
@@ -1739,6 +1739,62 @@ void Intrinsifier::TwoByteString_equality(Assembler* assembler) {
   StringEquality(assembler, kTwoByteStringCid);
 }
 
+
+// On stack: user tag (+1), return-address (+0).
+void Intrinsifier::UserTag_makeCurrent(Assembler* assembler) {
+  Isolate* isolate = Isolate::Current();
+  const Address current_tag_addr =
+      Address::Absolute(reinterpret_cast<uword>(isolate) +
+                        Isolate::current_tag_offset());
+  const Address user_tag_addr =
+      Address::Absolute(reinterpret_cast<uword>(isolate) +
+                        Isolate::user_tag_offset());
+  // EAX: UserTag.
+  __ movl(EAX, Address(ESP, + 1 * kWordSize));
+  // Set Isolate::current_tag_.
+  __ movl(current_tag_addr, EAX);
+  // EAX: UserTag's tag.
+  __ movl(EAX, FieldAddress(EAX, UserTag::tag_offset()));
+  // Set Isolate::user_tag_.
+  __ movl(user_tag_addr, EAX);
+  // Set return value.
+  const Immediate& raw_null =
+      Immediate(reinterpret_cast<int32_t>(Object::null()));
+  __ movl(EAX, raw_null);
+  __ ret();
+}
+
+
+void Intrinsifier::Profiler_getCurrentTag(Assembler* assembler) {
+  Isolate* isolate = Isolate::Current();
+  const Address current_tag_addr =
+      Address::Absolute(reinterpret_cast<uword>(isolate) +
+                        Isolate::current_tag_offset());
+  // Set return value to Isolate::current_tag_.
+  __ movl(EAX, current_tag_addr);
+  __ ret();
+}
+
+
+void Intrinsifier::Profiler_clearCurrentTag(Assembler* assembler) {
+  Isolate* isolate = Isolate::Current();
+  const Address current_tag_addr =
+      Address::Absolute(reinterpret_cast<uword>(isolate) +
+                        Isolate::current_tag_offset());
+  const Address user_tag_addr =
+      Address::Absolute(reinterpret_cast<uword>(isolate) +
+                        Isolate::user_tag_offset());
+  // Set return value to Isolate::current_tag_.
+  __ movl(EAX, current_tag_addr);
+  // Clear Isolate::current_tag_.
+  const Immediate& raw_null =
+      Immediate(reinterpret_cast<int32_t>(UserTag::null()));
+  __ movl(current_tag_addr, raw_null);
+  // Clear Isolate::user_tag_.
+  __ movl(user_tag_addr, Immediate(0));
+  __ ret();
+}
+
 #undef __
 }  // namespace dart