[profiler] Add check for SFI::script() being not undefined

src/profiler/profiler-listener.cc

 // 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.
 
 #include "src/profiler/profiler-listener.h"
 
 #include "src/deoptimizer.h"
 #include "src/profiler/cpu-profiler.h"
 #include "src/profiler/profile-generator-inl.h"
 #include "src/source-position-table.h"
@@ skipping 66 matching lines @@
 }
 
 void ProfilerListener::CodeCreateEvent(CodeEventListener::LogEventsAndTags tag,
                                        AbstractCode* abstract_code,
                                        SharedFunctionInfo* shared,
                                        Name* script_name, int line,
                                        int column) {
   CodeEventsContainer evt_rec(CodeEventRecord::CODE_CREATION);
   CodeCreateEventRecord* rec = &evt_rec.CodeCreateEventRecord_;
   rec->start = abstract_code->address();
-  Script* script = Script::cast(shared->script());
   JITLineInfoTable* line_table = NULL;
-  if (script) {
+  if (shared->script()->IsScript()) {
+    Script* script = Script::cast(shared->script());
     line_table = new JITLineInfoTable();
     int offset = abstract_code->IsCode() ? Code::kHeaderSize
                                          : BytecodeArray::kHeaderSize;
     for (SourcePositionTableIterator it(abstract_code->source_position_table());
          !it.done(); it.Advance()) {
       // TODO(alph,tebbi) Skipping inlined positions for now, because they might
       // refer to a different script.
       if (it.source_position().InliningId() != SourcePosition::kNotInlined)
         continue;
       int position = it.source_position().ScriptOffset();
@@ skipping 162 matching lines @@
       int inlining_id = static_cast<int>(it.rinfo()->data());
       last_position = SourcePosition(script_offset, inlining_id);
       continue;
     }
     if (info->rmode() == RelocInfo::DEOPT_ID) {
       int deopt_id = static_cast<int>(info->data());
       DCHECK(last_position.IsKnown());
       std::vector<CpuProfileDeoptFrame> inlined_frames;
       for (SourcePositionInfo& pos_info : last_position.InliningStack(code)) {
         DCHECK(pos_info.position.ScriptOffset() != kNoSourcePosition);
+        if (!pos_info.function->script()->IsScript()) continue;
+        int script_id = Script::cast(pos_info.function->script())->id();
         size_t offset = static_cast<size_t>(pos_info.position.ScriptOffset());
-        int script_id = Script::cast(pos_info.function->script())->id();
         inlined_frames.push_back(CpuProfileDeoptFrame({script_id, offset}));
       }
       if (!inlined_frames.empty() &&
           !entry->HasDeoptInlinedFramesFor(deopt_id)) {
         entry->AddDeoptInlinedFrames(deopt_id, std::move(inlined_frames));
       }
     }
   }
 }
 
@@ skipping 18 matching lines @@
 
 void ProfilerListener::RemoveObserver(CodeEventObserver* observer) {
   base::LockGuard<base::Mutex> guard(&mutex_);
   auto it = std::find(observers_.begin(), observers_.end(), observer);
   if (it == observers_.end()) return;
   observers_.erase(it);
 }
 
 }  // namespace internal
 }  // namespace v8