DBC: Implement OneByteStringFromCharCode and StringToCharCode.

runtime/vm/assembler_dbc_test.cc

Index: runtime/vm/assembler_dbc_test.cc
diff --git a/runtime/vm/assembler_dbc_test.cc b/runtime/vm/assembler_dbc_test.cc
index 9e4e2cdab4300fe276a5d6504b3ff0b804be6fec..c7fa0038049ddbe4f3d1627adaed3e8dfd6b0042 100644
--- a/runtime/vm/assembler_dbc_test.cc
+++ b/runtime/vm/assembler_dbc_test.cc
@@ -147,6 +147,46 @@ ASSEMBLER_TEST_GENERATE(StoreIntoObject, assembler) {
 }
 
 
+ASSEMBLER_TEST_GENERATE(OneByteStringFromCharCode, assembler) {

[zra, 2016/06/29 14:34:12]

I've been copying the comment from constants_dbc.h here for each of the
instructions being tested.

[rmacnak, 2016/06/29 16:44:16]

Done.

+  __ Frame(2);
+  __ LoadConstant(0, Smi::ZoneHandle(Smi::New(65)));
+  __ OneByteStringFromCharCode(1, 0);
+  __ Return(1);
+}
+
+
+ASSEMBLER_TEST_RUN(OneByteStringFromCharCode, test) {
+  EXPECT_EQ(Symbols::New(Thread::Current(), "A"),
+            EXECUTE_TEST_CODE_OBJECT(test->code()).raw());
+}
+
+
+ASSEMBLER_TEST_GENERATE(StringToCharCode, assembler) {
+  __ Frame(2);
+  __ LoadConstant(0, String::ZoneHandle(String::New("A", Heap::kOld)));
+  __ StringToCharCode(1, 0);
+  __ Return(1);
+}
+
+
+ASSEMBLER_TEST_RUN(StringToCharCode, test) {
+  EXPECT_EQ(65, EXECUTE_TEST_CODE_INTPTR(test->code()));
+}
+
+
+ASSEMBLER_TEST_GENERATE(StringToCharCodeIllegalLength, assembler) {
+  __ Frame(2);
+  __ LoadConstant(0, String::ZoneHandle(String::New("AAA", Heap::kOld)));
+  __ StringToCharCode(1, 0);
+  __ Return(1);
+}
+
+
+ASSEMBLER_TEST_RUN(StringToCharCodeIllegalLength, test) {
+  EXPECT_EQ(-1, EXECUTE_TEST_CODE_INTPTR(test->code()));
+}
+
+
 //  - AddTOS; SubTOS; MulTOS; BitOrTOS; BitAndTOS; EqualTOS; LessThanTOS;
 //    GreaterThanTOS;
 //