Runtime support for evaluation of static field initializer expressions

runtime/vm/intermediate_language.h

Index: runtime/vm/intermediate_language.h
===================================================================
--- runtime/vm/intermediate_language.h	(revision 39313)
+++ runtime/vm/intermediate_language.h	(working copy)
@@ -705,6 +705,7 @@
   M(LoadIndexed)                                                               \
   M(StoreIndexed)                                                              \
   M(StoreInstanceField)                                                        \
+  M(InitStaticField)                                                           \
   M(LoadStaticField)                                                           \
   M(StoreStaticField)                                                          \
   M(BooleanNegate)                                                             \
@@ -4624,6 +4625,31 @@
 };
 
 
+class InitStaticFieldInstr : public TemplateInstruction<1> {
+ public:
+  InitStaticFieldInstr(Value* input, const Field& field)
+      : field_(field) {
+    SetInputAt(0, input);
+  }
+
+  virtual intptr_t token_pos() const { return field_.token_pos(); }
+  const Field& field() const { return field_; }
+
+  DECLARE_INSTRUCTION(InitStaticField)
+
+  virtual intptr_t ArgumentCount() const { return 0; }
+  virtual bool CanDeoptimize() const { return true; }

[srdjan, 2014/08/19 18:49:39]

Why can it deoptimize?

[hausner, 2014/08/19 20:54:00]

As discussed offline, the initializer expression can have side effects that
cause deoptimization.

+  virtual EffectSet Effects() const { return EffectSet::All(); }
+  virtual bool MayThrow() const { return true; }
+  virtual Instruction* Canonicalize(FlowGraph* flow_graph);
+
+ private:
+  const Field& field_;
+
+  DISALLOW_COPY_AND_ASSIGN(InitStaticFieldInstr);
+};
+
+
 class AllocateUninitializedContextInstr : public TemplateDefinition<0> {
  public:
   AllocateUninitializedContextInstr(intptr_t token_pos,