[turbofan] Remember source positions when creating graph from bytecode.

src/compiler/bytecode-graph-builder.cc

Index: src/compiler/bytecode-graph-builder.cc
diff --git a/src/compiler/bytecode-graph-builder.cc b/src/compiler/bytecode-graph-builder.cc
index 0195f94030500c9806e5f3752a1307641d6f9f00..26deb67ff396c9d4be489b7a30b726f7db4a5caa 100644
--- a/src/compiler/bytecode-graph-builder.cc
+++ b/src/compiler/bytecode-graph-builder.cc
@@ -587,10 +587,9 @@ bool BytecodeGraphBuilder::Environment::StateValuesAreUpToDate(
                                 1, output_poke_start, output_poke_end);
 }
 
-BytecodeGraphBuilder::BytecodeGraphBuilder(Zone* local_zone,
-                                           CompilationInfo* info,
-                                           JSGraph* jsgraph,
-                                           float invocation_frequency)
+BytecodeGraphBuilder::BytecodeGraphBuilder(
+    Zone* local_zone, CompilationInfo* info, JSGraph* jsgraph,
+    float invocation_frequency, SourcePositionTable* source_positions)
     : local_zone_(local_zone),
       jsgraph_(jsgraph),
       invocation_frequency_(invocation_frequency),
@@ -613,8 +612,8 @@ BytecodeGraphBuilder::BytecodeGraphBuilder(Zone* local_zone,
                                     info->is_deoptimization_enabled()),
       state_values_cache_(jsgraph),
       liveness_analyzer_(
-          static_cast<size_t>(bytecode_array()->register_count()), local_zone) {
-}
+          static_cast<size_t>(bytecode_array()->register_count()), local_zone),
+      source_positions_(source_positions) {}
 
 Node* BytecodeGraphBuilder::GetNewTarget() {
   if (!new_target_.is_set()) {
@@ -714,11 +713,16 @@ void BytecodeGraphBuilder::VisitBytecodes() {
   loop_analysis.Analyze();
   set_branch_analysis(&analysis);
   set_loop_analysis(&loop_analysis);
+
   interpreter::BytecodeArrayIterator iterator(bytecode_array());
   set_bytecode_iterator(&iterator);
+  SourcePositionTableIterator source_position_iterator(
+      bytecode_array()->source_position_table());
+
   BuildOSRNormalEntryPoint();
   while (!iterator.done()) {
     int current_offset = iterator.current_offset();
+    UpdateCurrentSourcePosition(&source_position_iterator, current_offset);
     EnterAndExitExceptionHandlers(current_offset);
     SwitchToMergeEnvironment(current_offset);
     if (environment() != nullptr) {
@@ -736,6 +740,7 @@ void BytecodeGraphBuilder::VisitBytecodes() {
     }
     iterator.Advance();
   }
+
   set_branch_analysis(nullptr);
   set_bytecode_iterator(nullptr);
   DCHECK(exception_handlers_.empty());
@@ -2256,6 +2261,21 @@ Node* BytecodeGraphBuilder::MergeValue(Node* value, Node* other,
   return value;
 }
 
+void BytecodeGraphBuilder::UpdateCurrentSourcePosition(
+    SourcePositionTableIterator* it, int offset) {
+  // TODO(neis): Remove this once inlining supports source positions.
+  if (source_positions_ == nullptr) return;
+
+  if (it->done()) return;
+
+  if (it->code_offset() == offset) {
+    source_positions_->set_current_position(it->source_position());
+    it->Advance();
+  } else {
+    DCHECK_GT(it->code_offset(), offset);
+  }
+}
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8