Introduce CodeSourceMap object to hold pc -> token position mappings

runtime/vm/raw_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_RAW_OBJECT_H_
 #define VM_RAW_OBJECT_H_
 
 #include "platform/assert.h"
 #include "vm/atomic.h"
 #include "vm/globals.h"
@@ skipping 15 matching lines @@
   V(Field)                                                                     \
   V(LiteralToken)                                                              \
   V(TokenStream)                                                               \
   V(Script)                                                                    \
   V(Library)                                                                   \
   V(Namespace)                                                                 \
   V(Code)                                                                      \
   V(Instructions)                                                              \
   V(ObjectPool)                                                                \
   V(PcDescriptors)                                                             \
+  V(CodeSourceMap)                                                             \
   V(Stackmap)                                                                  \
   V(LocalVarDescriptors)                                                       \
   V(ExceptionHandlers)                                                         \
   V(Context)                                                                   \
   V(ContextScope)                                                              \
   V(ICData)                                                                    \
   V(MegamorphicCache)                                                          \
   V(SubtypeTestCache)                                                          \
   V(Error)                                                                     \
     V(ApiError)                                                                \
@@ skipping 1002 matching lines @@
   }
   RawInstructions* active_instructions_;
   RawInstructions* instructions_;
   RawObjectPool* object_pool_;
   // If owner_ is Function::null() the owner is a regular stub.
   // If owner_ is a Class the owner is the allocation stub for that class.
   // Else, owner_ is a regular Dart Function.
   RawObject* owner_;  // Function, Null, or a Class.
   RawExceptionHandlers* exception_handlers_;
   RawPcDescriptors* pc_descriptors_;
+  RawCodeSourceMap* code_source_map_;
   RawArray* stackmaps_;
   RawObject** to_snapshot() {
     return reinterpret_cast<RawObject**>(&ptr()->stackmaps_);
   }
   RawArray* deopt_info_array_;
   RawArray* static_calls_target_table_;  // (code-offset, function, code).
   RawLocalVarDescriptors* var_descriptors_;
   RawArray* inlined_metadata_;
   RawArray* comments_;
   // If return_address_metadata_ is a Smi, it is the offset to the prologue.
@@ skipping 127 matching lines @@
 
   // Variable length data follows here.
   uint8_t* data() { OPEN_ARRAY_START(uint8_t, intptr_t); }
   const uint8_t* data() const { OPEN_ARRAY_START(uint8_t, intptr_t); }
 
   friend class Object;
   friend class SnapshotReader;
 };
 
 
+// CodeSourceMap stores a mapping between code PC ranges and source token
+// positions.
+class RawCodeSourceMap : public RawObject {
+ private:
+  RAW_HEAP_OBJECT_IMPLEMENTATION(CodeSourceMap);
+
+  int32_t length_;  // Number of entries.
+
+  // Variable length data follows here.
+  uint8_t* data() { OPEN_ARRAY_START(uint8_t, intptr_t); }
+  const uint8_t* data() const { OPEN_ARRAY_START(uint8_t, intptr_t); }
+
+  friend class Object;
+  friend class SnapshotReader;
+};
+
+
 // Stackmap is an immutable representation of the layout of the stack at a
 // PC. The stack map representation consists of a bit map which marks each
 // live object index starting from the base of the frame.
 //
 // The bit map representation is optimized for dense and small bit maps, without
 // any upper bound.
 class RawStackmap : public RawObject {
   RAW_HEAP_OBJECT_IMPLEMENTATION(Stackmap);
 
   // Regarding changing this to a bitfield: ARM64 requires register_bit_count_
@@ skipping 1064 matching lines @@
   return (index == kArrayCid) ||
          (index == kImmutableArrayCid) ||
          RawObject::IsOneByteStringClassId(index) ||
          RawObject::IsTwoByteStringClassId(index) ||
          RawObject::IsTypedDataClassId(index) ||
          (index == kContextCid) ||
          (index == kTypeArgumentsCid) ||
          (index == kInstructionsCid) ||
          (index == kObjectPoolCid) ||
          (index == kPcDescriptorsCid) ||
+         (index == kCodeSourceMapCid) ||
          (index == kStackmapCid) ||
          (index == kLocalVarDescriptorsCid) ||
          (index == kExceptionHandlersCid) ||
          (index == kCodeCid) ||
          (index == kContextScopeCid) ||
          (index == kInstanceCid) ||
          (index == kJSRegExpCid);
 }
 
 
@@ skipping 11 matching lines @@
   COMPILE_ASSERT(kExternalTypedDataInt8ArrayCid ==
                  kTypedDataInt8ArrayViewCid + 15);
   COMPILE_ASSERT(kByteBufferCid == kExternalTypedDataInt8ArrayCid + 14);
   COMPILE_ASSERT(kNullCid == kByteBufferCid + 1);
   return (kNullCid - kTypedDataInt8ArrayCid);
 }
 
 }  // namespace dart
 
 #endif  // VM_RAW_OBJECT_H_