Build and use stack maps in the SSA compiler.

runtime/vm/object.h

Index: runtime/vm/object.h
diff --git a/runtime/vm/object.h b/runtime/vm/object.h
index 4aa8e604533d5689d438f1c9d06e4e315fa72079..60278bb8a4dded1669a15e17f203709364238a2b 100644
--- a/runtime/vm/object.h
+++ b/runtime/vm/object.h
@@ -2234,6 +2234,8 @@ class PcDescriptors : public Object {
   // Verify (assert) assumptions about pc descriptors in debug mode.
   void Verify(bool check_ids) const;
 
+  static void PrintHeaderString();
+
   // We would have a VisitPointers function here to traverse the
   // pc descriptors table to visit objects if any in the table.
 
@@ -2447,6 +2449,13 @@ class Code : public Object {
   void set_is_optimized(bool value) const {
     raw_ptr()->is_optimized_ = value ? 1 : 0;
   }
+  intptr_t spill_slot_count() const {
+    return raw_ptr()->spill_slot_count_;
+  }
+  void set_spill_slot_count(intptr_t count) const {

[srdjan, 2012/08/10 23:11:05]

ASSERT(is_optimized()) ?

[Kevin Millikin (Google), 2012/08/13 15:10:37]

Hmmm.  It's called for unoptimized code to set it to zero (maybe -1 is better).

Is there a better way than using the accessor to initialize it for unoptmized
code?

+    raw_ptr()->spill_slot_count_ = count;
+  }
+
   uword EntryPoint() const {
     const Instructions& instr = Instructions::Handle(instructions());
     return instr.EntryPoint();