[inspector] cache stack frame for call sites

src/objects-inl.h

 // Copyright 2012 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.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 4003 matching lines @@
 }
 
 int BytecodeArray::parameter_count() const {
   // Parameter count is stored as the size on stack of the parameters to allow
   // it to be used directly by generated code.
   return READ_INT_FIELD(this, kParameterSizeOffset) >> kPointerSizeLog2;
 }
 
 ACCESSORS(BytecodeArray, constant_pool, FixedArray, kConstantPoolOffset)
 ACCESSORS(BytecodeArray, handler_table, FixedArray, kHandlerTableOffset)
-ACCESSORS(BytecodeArray, source_position_table, ByteArray,
+ACCESSORS(BytecodeArray, source_position_table, Object,
           kSourcePositionTableOffset)
 
 Address BytecodeArray::GetFirstBytecodeAddress() {
   return reinterpret_cast<Address>(this) - kHeapObjectTag + kHeaderSize;
 }
 
+ByteArray* BytecodeArray::SourcePositionTable() {
+  Object* maybe_table = source_position_table();
+  if (maybe_table->IsByteArray()) return ByteArray::cast(maybe_table);
+  DCHECK(maybe_table->IsSourcePositionTableWithFrameCache());
+  return SourcePositionTableWithFrameCache::cast(maybe_table)
+      ->source_position_table();
+}
 
 int BytecodeArray::BytecodeArraySize() { return SizeFor(this->length()); }
 
 int BytecodeArray::SizeIncludingMetadata() {
   int size = BytecodeArraySize();
   size += constant_pool()->Size();
   size += handler_table()->Size();
-  size += source_position_table()->Size();
+  size += SourcePositionTable()->Size();
   return size;
 }
 
 ACCESSORS(FixedTypedArrayBase, base_pointer, Object, kBasePointerOffset)
 
 
 void* FixedTypedArrayBase::external_pointer() const {
   intptr_t ptr = READ_INTPTR_FIELD(this, kExternalPointerOffset);
   return reinterpret_cast<void*>(ptr);
 }
@@ skipping 1179 matching lines @@
 int AbstractCode::instruction_size() {
   if (IsCode()) {
     return GetCode()->instruction_size();
   } else {
     return GetBytecodeArray()->length();
   }
 }
 
 ByteArray* AbstractCode::source_position_table() {
   if (IsCode()) {
-    return GetCode()->source_position_table();
+    return GetCode()->SourcePositionTable();
   } else {
-    return GetBytecodeArray()->source_position_table();
+    return GetBytecodeArray()->SourcePositionTable();
   }
 }
 
 void AbstractCode::set_source_position_table(ByteArray* source_position_table) {
   if (IsCode()) {
     GetCode()->set_source_position_table(source_position_table);
   } else {
     GetBytecodeArray()->set_source_position_table(source_position_table);
   }
 }
 
+Object* AbstractCode::stack_frame_cache() {
+  Object* maybe_table;
+  if (IsCode()) {
+    maybe_table = GetCode()->source_position_table();
+  } else {
+    maybe_table = GetBytecodeArray()->source_position_table();
+  }
+  if (maybe_table->IsSourcePositionTableWithFrameCache()) {
+    return SourcePositionTableWithFrameCache::cast(maybe_table)
+        ->stack_frame_cache();
+  }
+  return Smi::kZero;
+}
+
 int AbstractCode::SizeIncludingMetadata() {
   if (IsCode()) {
     return GetCode()->SizeIncludingMetadata();
   } else {
     return GetBytecodeArray()->SizeIncludingMetadata();
   }
 }
 int AbstractCode::ExecutableSize() {
   if (IsCode()) {
     return GetCode()->ExecutableSize();
@@ skipping 552 matching lines @@
 SMI_ACCESSORS(StackFrameInfo, script_id, kScriptIdIndex)
 ACCESSORS(StackFrameInfo, script_name, Object, kScriptNameIndex)
 ACCESSORS(StackFrameInfo, script_name_or_source_url, Object,
           kScriptNameOrSourceUrlIndex)
 ACCESSORS(StackFrameInfo, function_name, Object, kFunctionNameIndex)
 SMI_ACCESSORS(StackFrameInfo, flag, kFlagIndex)
 BOOL_ACCESSORS(StackFrameInfo, flag, is_eval, kIsEvalBit)
 BOOL_ACCESSORS(StackFrameInfo, flag, is_constructor, kIsConstructorBit)
 BOOL_ACCESSORS(StackFrameInfo, flag, is_wasm, kIsWasmBit)
 
+ACCESSORS(SourcePositionTableWithFrameCache, source_position_table, ByteArray,
+          kSourcePositionTableIndex)
+ACCESSORS(SourcePositionTableWithFrameCache, stack_frame_cache,
+          UnseededNumberDictionary, kStackFrameCacheIndex)
+
 ACCESSORS(SharedFunctionInfo, name, Object, kNameOffset)
 ACCESSORS(SharedFunctionInfo, optimized_code_map, FixedArray,
           kOptimizedCodeMapOffset)
 ACCESSORS(SharedFunctionInfo, construct_stub, Code, kConstructStubOffset)
 ACCESSORS(SharedFunctionInfo, feedback_metadata, FeedbackMetadata,
           kFeedbackMetadataOffset)
 SMI_ACCESSORS(SharedFunctionInfo, function_literal_id, kFunctionLiteralIdOffset)
 #if TRACE_MAPS
 SMI_ACCESSORS(SharedFunctionInfo, unique_id, kUniqueIdOffset)
 #endif
@@ skipping 806 matching lines @@
 
 INT_ACCESSORS(Code, instruction_size, kInstructionSizeOffset)
 INT_ACCESSORS(Code, prologue_offset, kPrologueOffset)
 INT_ACCESSORS(Code, constant_pool_offset, kConstantPoolOffset)
 #define CODE_ACCESSORS(name, type, offset)           \
   ACCESSORS_CHECKED2(Code, name, type, offset, true, \
                      !GetHeap()->InNewSpace(value))
 CODE_ACCESSORS(relocation_info, ByteArray, kRelocationInfoOffset)
 CODE_ACCESSORS(handler_table, FixedArray, kHandlerTableOffset)
 CODE_ACCESSORS(deoptimization_data, FixedArray, kDeoptimizationDataOffset)
-CODE_ACCESSORS(source_position_table, ByteArray, kSourcePositionTableOffset)
+CODE_ACCESSORS(source_position_table, Object, kSourcePositionTableOffset)
 CODE_ACCESSORS(trap_handler_index, Smi, kTrapHandlerIndex)
 CODE_ACCESSORS(raw_type_feedback_info, Object, kTypeFeedbackInfoOffset)
 CODE_ACCESSORS(next_code_link, Object, kNextCodeLinkOffset)
 #undef CODE_ACCESSORS
 
 void Code::WipeOutHeader() {
   WRITE_FIELD(this, kRelocationInfoOffset, NULL);
   WRITE_FIELD(this, kHandlerTableOffset, NULL);
   WRITE_FIELD(this, kDeoptimizationDataOffset, NULL);
   WRITE_FIELD(this, kSourcePositionTableOffset, NULL);
@@ skipping 12 matching lines @@
 }
 
 
 void Code::set_type_feedback_info(Object* value, WriteBarrierMode mode) {
   DCHECK(kind() == FUNCTION);
   set_raw_type_feedback_info(value, mode);
   CONDITIONAL_WRITE_BARRIER(GetHeap(), this, kTypeFeedbackInfoOffset,
                             value, mode);
 }
 
+ByteArray* Code::SourcePositionTable() {
+  Object* maybe_table = source_position_table();
+  if (maybe_table->IsByteArray()) return ByteArray::cast(maybe_table);
+  DCHECK(maybe_table->IsSourcePositionTableWithFrameCache());
+  return SourcePositionTableWithFrameCache::cast(maybe_table)
+      ->source_position_table();
+}
 
 uint32_t Code::stub_key() {
   DCHECK(IsCodeStubOrIC());
   Smi* smi_key = Smi::cast(raw_type_feedback_info());
   return static_cast<uint32_t>(smi_key->value());
 }
 
 
 void Code::set_stub_key(uint32_t key) {
   DCHECK(IsCodeStubOrIC());
@@ skipping 46 matching lines @@
           ? static_cast<int>(unwinding_info_end() - instruction_start())
           : instruction_size();
   return RoundUp(unpadded_body_size, kObjectAlignment);
 }
 
 int Code::SizeIncludingMetadata() {
   int size = CodeSize();
   size += relocation_info()->Size();
   size += deoptimization_data()->Size();
   size += handler_table()->Size();
-  if (kind() == FUNCTION) size += source_position_table()->Size();
+  if (kind() == FUNCTION) {
+    size += SourcePositionTable()->Size();
+  }
   return size;
 }
 
 ByteArray* Code::unchecked_relocation_info() {
   return reinterpret_cast<ByteArray*>(READ_FIELD(this, kRelocationInfoOffset));
 }
 
 
 byte* Code::relocation_start() {
   return unchecked_relocation_info()->GetDataStartAddress();
@@ skipping 1510 matching lines @@
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 }  // namespace internal
 }  // namespace v8
 
 #include "src/objects/object-macros-undef.h"
 
 #endif  // V8_OBJECTS_INL_H_