VM(RegExp): Allow OSR optimization of RegExp :matcher functions.

runtime/vm/intermediate_language.h

 // Copyright (c) 2013, 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 RUNTIME_VM_INTERMEDIATE_LANGUAGE_H_
 #define RUNTIME_VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 7248 matching lines @@
 
  private:
   const Token::Kind op_kind_;
 
   DISALLOW_COPY_AND_ASSIGN(UnaryDoubleOpInstr);
 };
 
 
 class CheckStackOverflowInstr : public TemplateInstruction<0, NoThrow> {
  public:
+  enum Kind {
+    // Full stack overflow checks are emitted in both unoptimized and
+    // optimized versions of the code.
+    kFull,
+
+    // OsrEntry stack overflow checks are only needed in the unoptimized code
+    // because we can't OSR optimized code.
+    kOsrEntry,
+  };
+
   CheckStackOverflowInstr(TokenPosition token_pos,
                           intptr_t loop_depth,
-                          intptr_t deopt_id)
+                          intptr_t deopt_id,
+                          Kind kind = kFull)
       : TemplateInstruction(deopt_id),
         token_pos_(token_pos),
-        loop_depth_(loop_depth) {}
+        loop_depth_(loop_depth),
+        kind_(kind) {
+    ASSERT(kind != kOsrEntry || loop_depth > 0);
+  }
 
   virtual TokenPosition token_pos() const { return token_pos_; }
   bool in_loop() const { return loop_depth_ > 0; }
   intptr_t loop_depth() const { return loop_depth_; }
 
   DECLARE_INSTRUCTION(CheckStackOverflow)
 
   virtual bool ComputeCanDeoptimize() const { return true; }
 
+  virtual Instruction* Canonicalize(FlowGraph* flow_graph);
+
   virtual EffectSet Effects() const { return EffectSet::None(); }
 
   PRINT_OPERANDS_TO_SUPPORT
 
  private:
   const TokenPosition token_pos_;
   const intptr_t loop_depth_;
+  const Kind kind_;
 
   DISALLOW_COPY_AND_ASSIGN(CheckStackOverflowInstr);
 };
 
 
 // TODO(vegorov): remove this instruction in favor of Int32ToDouble.
 class SmiToDoubleInstr : public TemplateDefinition<1, NoThrow, Pure> {
  public:
   SmiToDoubleInstr(Value* value, TokenPosition token_pos)
       : token_pos_(token_pos) {
@@ skipping 934 matching lines @@
   LocationSummary* Name::MakeLocationSummary(Zone* zone, bool opt) const {     \
     UNIMPLEMENTED();                                                           \
     return NULL;                                                               \
   }                                                                            \
   void Name::EmitNativeCode(FlowGraphCompiler* compiler) { UNIMPLEMENTED(); }
 
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_INTERMEDIATE_LANGUAGE_H_