Inline native String.charCodeAt in optimized code.

runtime/vm/intermediate_language.h

 // Copyright (c) 2012, 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.
 
 #ifndef VM_INTERMEDIATE_LANGUAGE_H_
 #define VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 19 matching lines @@
 
 // TODO(srdjan): Add _ByteArrayBase, get:length.
 
 #define RECOGNIZED_LIST(V)                                                     \
   V(_ObjectArray, get:length, ObjectArrayLength)                               \
   V(_ImmutableArray, get:length, ImmutableArrayLength)                         \
   V(_GrowableObjectArray, get:length, GrowableArrayLength)                     \
   V(_GrowableObjectArray, get:capacity, GrowableArrayCapacity)                 \
   V(_StringBase, get:length, StringBaseLength)                                 \
   V(_StringBase, get:isEmpty, StringBaseIsEmpty)                               \
+  V(_StringBase, charCodeAt, StringBaseCharCodeAt)                             \
   V(_IntegerImplementation, toDouble, IntegerToDouble)                         \
   V(_Double, toInt, DoubleToInteger)                                           \
   V(::, sqrt, MathSqrt)                                                        \
 
 // Class that recognizes the name and owner of a function and returns the
 // corresponding enum. See RECOGNIZED_LIST above for list of recognizable
 // functions.
 class MethodRecognizer : public AllStatic {
  public:
   enum Kind {
@@ skipping 206 matching lines @@
   M(MathSqrt)                                                                  \
   M(UnboxDouble)                                                               \
   M(BoxDouble)                                                                 \
   M(UnboxInteger)                                                              \
   M(BoxInteger)                                                                \
   M(BinaryMintOp)                                                              \
   M(ShiftMintOp)                                                               \
   M(UnaryMintOp)                                                               \
   M(CheckArrayBound)                                                           \
   M(Constraint)                                                                \
+  M(StringCharCodeAt)
 
 
 #define FORWARD_DECLARATION(type) class type##Instr;
 FOR_EACH_INSTRUCTION(FORWARD_DECLARATION)
 #undef FORWARD_DECLARATION
 
 
 // Functions required in all concrete instruction classes.
 #define DECLARE_INSTRUCTION(type)                                              \
   virtual Tag tag() const { return k##type; }                                  \
@@ skipping 242 matching lines @@
   friend class BinaryMintOpInstr;
   friend class BinarySmiOpInstr;
   friend class UnarySmiOpInstr;
   friend class ShiftMintOpInstr;
   friend class UnaryMintOpInstr;
   friend class MathSqrtInstr;
   friend class CheckClassInstr;
   friend class CheckSmiInstr;
   friend class CheckArrayBoundInstr;
   friend class CheckEitherNonSmiInstr;
+  friend class StringCharCodeAtInstr;
   friend class LICM;
 
   intptr_t deopt_id_;
   intptr_t lifetime_position_;  // Position used by register allocator.
   Instruction* previous_;
   Instruction* next_;
   Environment* env_;
   intptr_t expr_id_;
 
   DISALLOW_COPY_AND_ASSIGN(Instruction);
@@ skipping 2090 matching lines @@
 
   virtual intptr_t ResultCid() const { return kDynamicCid; }
 
  private:
   const Field& field_;
 
   DISALLOW_COPY_AND_ASSIGN(StoreStaticFieldInstr);
 };
 
 
+class StringCharCodeAtInstr : public TemplateDefinition<2> {
+ public:
+  StringCharCodeAtInstr(Value* receiver,
+                        Value* index,
+                        intptr_t class_id)
+      : class_id_(class_id) {
+    ASSERT(receiver != NULL);
+    ASSERT(index != NULL);
+    inputs_[0] = receiver;
+    inputs_[1] = index;
+  }
+
+  DECLARE_INSTRUCTION(StringCharCodeAt)
+  virtual RawAbstractType* CompileType() const;
+
+  Value* receiver() const { return inputs_[0]; }
+  Value* index() const { return inputs_[1]; }
+  intptr_t class_id() const { return class_id_; }
+
+  virtual bool CanDeoptimize() const { return false; }
+
+  virtual bool HasSideEffect() const { return false; }
+
+  virtual intptr_t ResultCid() const;
+
+  virtual bool AttributesEqual(Instruction* other) const;
+
+  virtual bool AffectedBySideEffect() const { return true; }
+
+ private:
+  const intptr_t class_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(StringCharCodeAtInstr);
+};
+
+
 class LoadIndexedInstr : public TemplateDefinition<2> {
  public:
   LoadIndexedInstr(Value* array, Value* index, intptr_t class_id)
       : class_id_(class_id) {
     ASSERT(array != NULL);
     ASSERT(index != NULL);
     inputs_[0] = array;
     inputs_[1] = index;
   }
 
@@ skipping 1325 matching lines @@
   Value* array() const { return inputs_[0]; }
   Value* index() const { return inputs_[1]; }
 
   intptr_t array_type() const { return array_type_; }
 
   bool IsRedundant(RangeBoundary length);
 
  private:
   intptr_t array_type_;
 
+  // Returns the length offset for array and string types.
+  static intptr_t LengthOffsetFor(intptr_t class_id);
+
   DISALLOW_COPY_AND_ASSIGN(CheckArrayBoundInstr);
 };
 
 
 #undef DECLARE_INSTRUCTION
 
 class Environment : public ZoneAllocated {
  public:
   // Iterate the non-NULL values in the innermost level of an environment.
   class ShallowIterator : public ValueObject {
@@ skipping 198 matching lines @@
   ForwardInstructionIterator* current_iterator_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FlowGraphVisitor);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_