Intrinsify UserTag operations on all architectures

runtime/vm/intrinsifier_arm.cc

Index: runtime/vm/intrinsifier_arm.cc
diff --git a/runtime/vm/intrinsifier_arm.cc b/runtime/vm/intrinsifier_arm.cc
index 1b29a2b4e1bbd5106fdceaec17a0045227f8121a..84ef39bb03e1ce0d7c797a99eec9137a2590fd03 100644
--- a/runtime/vm/intrinsifier_arm.cc
+++ b/runtime/vm/intrinsifier_arm.cc
@@ -1707,6 +1707,52 @@ void Intrinsifier::TwoByteString_equality(Assembler* assembler) {
 }
 
 
+// On stack: user tag (+0).
+void Intrinsifier::UserTag_makeCurrent(Assembler* assembler) {
+  // R1: Isolate.
+  Isolate* isolate = Isolate::Current();
+  __ LoadImmediate(R1, reinterpret_cast<uword>(isolate));
+  // R0: UserTag.
+  __ ldr(R0, Address(SP, + 0 * kWordSize));
+  // Set Isolate::current_tag_.
+  __ str(R0, Address(R1, Isolate::current_tag_offset()));
+  // R0: UserTag's tag.
+  __ ldr(R0, FieldAddress(R0, UserTag::tag_offset()));
+  // Set Isolate::user_tag_.
+  __ str(R0, Address(R1, Isolate::user_tag_offset()));
+  // Set return value.
+  const int32_t raw_null = reinterpret_cast<int32_t>(Object::null());
+  __ LoadImmediate(R0, raw_null);
+  __ Ret();
+}
+
+
+void Intrinsifier::Profiler_getCurrentTag(Assembler* assembler) {
+  // R1: Isolate.
+  Isolate* isolate = Isolate::Current();
+  __ LoadImmediate(R1, reinterpret_cast<uword>(isolate));
+  // Set return value to Isolate::current_tag_.
+  __ ldr(R0, Address(R1, Isolate::current_tag_offset()));
+  __ Ret();
+}
+
+
+void Intrinsifier::Profiler_clearCurrentTag(Assembler* assembler) {
+  // R1: Isolate.
+  Isolate* isolate = Isolate::Current();
+  __ LoadImmediate(R1, reinterpret_cast<uword>(isolate));
+  // Set return value to Isolate::current_tag_.
+  __ ldr(R0, Address(R1, Isolate::current_tag_offset()));
+  // Clear Isolate::current_tag_.
+  const int32_t raw_null = reinterpret_cast<int32_t>(UserTag::null());
+  __ LoadImmediate(R2, raw_null);
+  __ str(R2, Address(R1, Isolate::current_tag_offset()));
+  // Clear Isolate::user_tag_.
+  __ eor(R2, R2, ShifterOperand(R2));
+  __ str(R2, Address(R1, Isolate::user_tag_offset()));
+  __ Ret();
+}
+
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM