Build and use stack maps in the SSA compiler.

runtime/vm/object.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_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 2216 matching lines @@
     ASSERT(0 <= len && len <= kMaxElements);
     return RoundedAllocationSize(
         sizeof(RawPcDescriptors) + (len * kBytesPerElement));
   }
 
   static RawPcDescriptors* New(intptr_t num_descriptors);
 
   // 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.
 
  private:
   void SetPC(intptr_t index, uword value) const;
   void SetKind(intptr_t index, PcDescriptors::Kind kind) const;
   void SetDeoptId(intptr_t index, intptr_t value) const;
   void SetTokenPos(intptr_t index, intptr_t value) const;
   void SetTryIndex(intptr_t index, intptr_t value) const;
 
@@ skipping 193 matching lines @@
   }
   intptr_t pointer_offsets_length() const {
     return raw_ptr()->pointer_offsets_length_;
   }
   bool is_optimized() const {
     return (raw_ptr()->is_optimized_ == 1);
   }
   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();
   }
   intptr_t Size() const {
     const Instructions& instr = Instructions::Handle(instructions());
     return instr.size();
   }
 
   RawPcDescriptors* pc_descriptors() const {
@@ skipping 2959 matching lines @@
     if (this->CharAt(i) != str.CharAt(begin_index + i)) {
       return false;
     }
   }
   return true;
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_