Simplify JIT event logging.

src/source-position-table.h

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_SOURCE_POSITION_TABLE_H_
 #define V8_SOURCE_POSITION_TABLE_H_
 
 #include "src/assert-scope.h"
 #include "src/checks.h"
 #include "src/handles.h"
-#include "src/log.h"
 #include "src/zone-containers.h"
 
 namespace v8 {
 namespace internal {
 
+class AbstractCode;
 class BytecodeArray;
 class ByteArray;
 class Isolate;
 class Zone;
 
 struct PositionTableEntry {
   PositionTableEntry()
       : code_offset(0), source_position(0), is_statement(false) {}
   PositionTableEntry(int offset, int source, bool statement)
       : code_offset(offset), source_position(source), is_statement(statement) {}
 
   int code_offset;
   int source_position;
   bool is_statement;
 };
 
-class SourcePositionTableBuilder final : public PositionsRecorder {
+class SourcePositionTableBuilder {
  public:
-  SourcePositionTableBuilder(Isolate* isolate, Zone* zone)
-      : isolate_(isolate),
-        bytes_(zone),
-#ifdef ENABLE_SLOW_DCHECKS
-        raw_entries_(zone),
-#endif
-        previous_() {
-  }
+  SourcePositionTableBuilder(Isolate* isolate, Zone* zone);
+
+  void EndJitLogging(AbstractCode* code);
 
   void AddPosition(size_t code_offset, int source_position, bool is_statement);
   Handle<ByteArray> ToSourcePositionTable();
 
  private:
   void AddEntry(const PositionTableEntry& entry);
-  void CommitEntry();
 
   Isolate* isolate_;
   ZoneVector<byte> bytes_;
 #ifdef ENABLE_SLOW_DCHECKS
   ZoneVector<PositionTableEntry> raw_entries_;
 #endif
   PositionTableEntry previous_;  // Previously written entry, to compute delta.
+  // Currently jit_handler_data_ is used to store JITHandler-specific data
+  // over the lifetime of a SourcePositionTableBuilder.
+  void* jit_handler_data_;
 };
 
 class SourcePositionTableIterator {
  public:
   explicit SourcePositionTableIterator(ByteArray* byte_array);
 
   void Advance();
 
   int code_offset() const {
     DCHECK(!done());
@@ skipping 15 matching lines @@
   ByteArray* table_;
   int index_;
   PositionTableEntry current_;
   DisallowHeapAllocation no_gc;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_SOURCE_POSITION_TABLE_H_