[maglev] Support StaLookupSlot

Bug: v8:7700
Change-Id: I3ea3027feb51f10ef0587328835d5a3a1002ed54
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3803029Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82101}

src/interpreter/bytecode-flags.cc

@@ -83,6 +83,16 @@ uint8_t StoreLookupSlotFlags::Encode(LanguageMode language_mode,
          LookupHoistingModeBit::encode(static_cast<bool>(lookup_hoisting_mode));
 }
 
+// static
+LanguageMode StoreLookupSlotFlags::GetLanguageMode(uint8_t flags) {
+  return LanguageModeBit::decode(flags);
+}
+
+// static
+bool StoreLookupSlotFlags::IsLookupHoistingMode(uint8_t flags) {
+  return LookupHoistingModeBit::decode(flags);
+}
+
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8

src/interpreter/bytecode-flags.h

@@ -88,6 +88,9 @@ class StoreLookupSlotFlags {
   static uint8_t Encode(LanguageMode language_mode,
                         LookupHoistingMode lookup_hoisting_mode);
 
+  static LanguageMode GetLanguageMode(uint8_t flags);
+  static bool IsLookupHoistingMode(uint8_t flags);
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(StoreLookupSlotFlags);
 };

src/maglev/maglev-graph-builder.cc

@@ -831,7 +831,29 @@ void MaglevGraphBuilder::VisitLdaLookupGlobalSlotInsideTypeof() {
       BuildCallRuntime(Runtime::kLoadLookupSlotInsideTypeof, {name}));
 }
 
-MAGLEV_UNIMPLEMENTED_BYTECODE(StaLookupSlot)
+namespace {
+Runtime::FunctionId StaLookupSlotFunction(uint8_t sta_lookup_slot_flags) {
+  using Flags = interpreter::StoreLookupSlotFlags;
+  switch (Flags::GetLanguageMode(sta_lookup_slot_flags)) {
+    case LanguageMode::kStrict:
+      return Runtime::kStoreLookupSlot_Strict;
+    case LanguageMode::kSloppy:
+      if (Flags::IsLookupHoistingMode(sta_lookup_slot_flags)) {
+        return Runtime::kStoreLookupSlot_SloppyHoisting;
+      } else {
+        return Runtime::kStoreLookupSlot_Sloppy;
+      }
+  }
+}
+}  // namespace
+
+void MaglevGraphBuilder::VisitStaLookupSlot() {
+  // StaLookupSlot <name_index> <flags>
+  ValueNode* value = GetAccumulatorTagged();
+  ValueNode* name = GetConstant(GetRefOperand<Name>(0));
+  uint32_t flags = GetFlagOperand(1);
+  SetAccumulator(BuildCallRuntime(StaLookupSlotFunction(flags), {name, value}));
+}
 
 void MaglevGraphBuilder::BuildMapCheck(ValueNode* object,
                                        const compiler::MapRef& map) {