[inspector] cache stack frame for call sites

src/isolate.cc

 // 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.
 
 #include "src/isolate.h"
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
@@ skipping 648 matching lines @@
 
   Handle<StackFrameInfo> NewStackFrameObject(FrameSummary& summ) {
     if (summ.IsJavaScript()) return NewStackFrameObject(summ.AsJavaScript());
     if (summ.IsWasm()) return NewStackFrameObject(summ.AsWasm());
     UNREACHABLE();
     return factory()->NewStackFrameInfo();
   }
 
   Handle<StackFrameInfo> NewStackFrameObject(
       const FrameSummary::JavaScriptFrameSummary& summ) {
+    int code_offset;
+    Handle<ByteArray> source_position_table;
+    Object* maybe_cache;
+    Handle<UnseededNumberDictionary> cache;
+    if (!FLAG_optimize_for_size) {
+      code_offset = summ.code_offset();
+      source_position_table =
+          handle(summ.abstract_code()->source_position_table(), isolate_);
+      maybe_cache = summ.abstract_code()->stack_frame_cache();
+      if (maybe_cache->IsUnseededNumberDictionary()) {
+        cache = handle(UnseededNumberDictionary::cast(maybe_cache));
+      } else {
+        cache = UnseededNumberDictionary::New(isolate_, 1);
+      }
+      int entry = cache->FindEntry(code_offset);
+      if (entry != UnseededNumberDictionary::kNotFound) {
+        Handle<StackFrameInfo> frame(
+            StackFrameInfo::cast(cache->ValueAt(entry)));
+        DCHECK(frame->function_name()->IsString());
+        Handle<String> function_name = summ.FunctionName();
+        if (function_name->Equals(String::cast(frame->function_name()))) {
+          return frame;
+        }
+      }
+    }
+
     Handle<StackFrameInfo> frame = factory()->NewStackFrameInfo();
     Handle<Script> script = Handle<Script>::cast(summ.script());
     Script::PositionInfo info;
     bool valid_pos = Script::GetPositionInfo(script, summ.SourcePosition(),
                                              &info, Script::WITH_OFFSET);
     if (valid_pos) {
       frame->set_line_number(info.line + 1);
       frame->set_column_number(info.column + 1);
     }
     frame->set_script_id(script->id());
     frame->set_script_name(script->name());
     frame->set_script_name_or_source_url(script->GetNameOrSourceURL());
     frame->set_is_eval(script->compilation_type() ==
                        Script::COMPILATION_TYPE_EVAL);
     Handle<String> function_name = summ.FunctionName();
     frame->set_function_name(*function_name);
     frame->set_is_constructor(summ.is_constructor());
     frame->set_is_wasm(false);
+    if (!FLAG_optimize_for_size) {
+      auto new_cache =
+          UnseededNumberDictionary::AtNumberPut(cache, code_offset, frame);
+      if (*new_cache != *cache || !maybe_cache->IsUnseededNumberDictionary()) {
+        AbstractCode::SetStackFrameCache(summ.abstract_code(), new_cache);
+      }
+    }
     return frame;
   }
 
   Handle<StackFrameInfo> NewStackFrameObject(
       const FrameSummary::WasmFrameSummary& summ) {
     Handle<StackFrameInfo> info = factory()->NewStackFrameInfo();
 
     Handle<WasmCompiledModule> compiled_module(
         summ.wasm_instance()->compiled_module(), isolate_);
     Handle<String> name = WasmCompiledModule::GetFunctionName(
@@ skipping 3017 matching lines @@
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8