[inspector] cache stack frame for call sites

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index f5900849b7021765ca523186995cc541d38690d3..c6c417f419f7de5195e6b0e7616ee100e0e55d74 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -4021,13 +4021,20 @@ int BytecodeArray::parameter_count() const {
 
 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()); }
 
@@ -4035,7 +4042,7 @@ int BytecodeArray::SizeIncludingMetadata() {
   int size = BytecodeArraySize();
   size += constant_pool()->Size();
   size += handler_table()->Size();
-  size += source_position_table()->Size();
+  size += SourcePositionTable()->Size();
   return size;
 }
 
@@ -5235,9 +5242,9 @@ int AbstractCode::instruction_size() {
 
 ByteArray* AbstractCode::source_position_table() {
   if (IsCode()) {
-    return GetCode()->source_position_table();
+    return GetCode()->SourcePositionTable();
   } else {
-    return GetBytecodeArray()->source_position_table();
+    return GetBytecodeArray()->SourcePositionTable();
   }
 }
 
@@ -5249,6 +5256,20 @@ void AbstractCode::set_source_position_table(ByteArray* 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();
@@ -5824,6 +5845,11 @@ BOOL_ACCESSORS(StackFrameInfo, flag, is_wasm, kIsWasmBit)
 ACCESSORS(StackTraceInfo, frames, FixedArray, kFramesIndex)
 SMI_ACCESSORS(StackTraceInfo, options, kOptionsIndex)
 
+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)
@@ -6650,7 +6676,7 @@ INT_ACCESSORS(Code, constant_pool_offset, kConstantPoolOffset)
 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)
@@ -6683,6 +6709,13 @@ void Code::set_type_feedback_info(Object* value, WriteBarrierMode mode) {
                             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());
@@ -6749,7 +6782,9 @@ int Code::SizeIncludingMetadata() {
   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;
 }