Backed out 2 changesets (bug 1569315) on request from mgaudet on a CLOSED TREE

Backed out changeset eb0b2f561461 (bug 1569315)
Backed out changeset 5d553fb84ecb (bug 1569315)

js/src/frontend/BinASTParserPerTokenizer.cpp

@@ -261,15 +261,10 @@ JS::Result<FunctionBox*> BinASTParserPerTokenizer<Tok>::buildFunctionBox(
 
   // Allocate the function before walking down the tree.
   RootedFunction fun(cx_);
-  if (pc_) {
-    Rooted<FunctionCreationData> fcd(
-        cx_, GenerateFunctionCreationData(atom, syntax, generatorKind,
-                                          functionAsyncKind));
-    BINJS_TRY_VAR(fun, AllocNewFunction(cx_, fcd));
-    MOZ_ASSERT(fun->explicitName() == atom);
-  } else {
-    BINJS_TRY_VAR(fun, lazyScript_->functionNonDelazifying());
-  }
+  BINJS_TRY_VAR(fun, !pc_ ? lazyScript_->functionNonDelazifying()
+                          : AllocNewFunction(cx_, atom, syntax, generatorKind,
+                                             functionAsyncKind));
+  MOZ_ASSERT_IF(pc_, fun->explicitName() == atom);
 
   mozilla::Maybe<Directives> directives;
   if (pc_) {

js/src/frontend/FunctionCreationData.h

@@ -1,47 +0,0 @@
-/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
- * vim: set ts=8 sts=2 et sw=2 tw=80:
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef frontend_FunctionCreationData_h
-#define frontend_FunctionCreationData_h
-
-#include "frontend/ParseNode.h"
-#include "gc/AllocKind.h"
-#include "gc/Rooting.h"
-#include "vm/JSFunction.h"
-#include "vm/JSScript.h"
-
-namespace js {
-namespace frontend {
-
-// Metadata that can be used to allocate a JSFunction object.
-//
-// Keeping metadata separate allows the parser to generate
-// metadata without requiring immediate access to the garbage
-// collector.
-struct FunctionCreationData {
-  // The Parser uses KeepAtoms to prevent GC from collecting atoms
-  JSAtom* atom = nullptr;
-  FunctionSyntaxKind kind = FunctionSyntaxKind::Expression;
-  GeneratorKind generatorKind = GeneratorKind::NotGenerator;
-  FunctionAsyncKind asyncKind = FunctionAsyncKind::SyncFunction;
-
-  gc::AllocKind allocKind = gc::AllocKind::FUNCTION;
-  FunctionFlags flags = {};
-
-  bool isSelfHosting = false;
-
-  HandleAtom getAtom(JSContext* cx) const;
-
-  void trace(JSTracer* trc) {
-    TraceRoot(trc, &atom, "FunctionCreationData atom");
-  }
-};
-
-
-} /* namespace frontend */
-} /* namespace js */
-
-#endif /* frontend_FunctionCreationData_h */

js/src/frontend/Parser.cpp

@@ -1966,10 +1966,21 @@ GeneralParser<ParseHandler, Unit>::functionBody(InHandling inHandling,
   return finishLexicalScope(pc_->varScope(), body, ScopeKind::FunctionLexical);
 }
 
-FunctionCreationData GenerateFunctionCreationData(
-    HandleAtom atom, FunctionSyntaxKind kind, GeneratorKind generatorKind,
-    FunctionAsyncKind asyncKind, bool isSelfHosting /* = false */,
-    bool inFunctionBox /* = false */) {
+JSFunction* AllocNewFunction(JSContext* cx, HandleAtom atom,
+                             FunctionSyntaxKind kind,
+                             GeneratorKind generatorKind,
+                             FunctionAsyncKind asyncKind,
+                             bool isSelfHosting /* = false */,
+                             bool inFunctionBox /* = false */) {
+  MOZ_ASSERT_IF(kind == FunctionSyntaxKind::Statement, atom != nullptr);
+
+  RootedObject proto(cx);
+  if (!GetFunctionPrototype(cx, generatorKind, asyncKind, &proto)) {
+    return nullptr;
+  }
+
+  RootedFunction fun(cx);
+
   gc::AllocKind allocKind = gc::AllocKind::FUNCTION;
   FunctionFlags flags;
   bool isExtendedUnclonedSelfHostedFunctionName =
@@ -2015,35 +2026,12 @@ FunctionCreationData GenerateFunctionCreationData(
                    : FunctionFlags::INTERPRETED_GENERATOR_OR_ASYNC);
   }
 
-  return FunctionCreationData{atom,      kind,  generatorKind, asyncKind,
-                              allocKind, flags, isSelfHosting};
-}
-
-HandleAtom FunctionCreationData::getAtom(JSContext* cx) const {
-  // We can create a handle here because atoms are traced
-  // by FunctionCreationData.
-  return HandleAtom::fromMarkedLocation(&atom);
-}
-
-JSFunction* AllocNewFunction(JSContext* cx,
-                             Handle<FunctionCreationData> dataHandle) {
-  // FunctionCreationData don't move, so it is safe to grab a reference
-  // out of the handle.
-  const FunctionCreationData& data = dataHandle.get();
-
-  RootedObject proto(cx);
-  if (!GetFunctionPrototype(cx, data.generatorKind, data.asyncKind, &proto)) {
-    return nullptr;
-  }
-  RootedFunction fun(cx);
-
-
-  fun = NewFunctionWithProto(cx, nullptr, 0, data.flags, nullptr, data.getAtom(cx), proto,
-                             data.allocKind, TenuredObject);
+  fun = NewFunctionWithProto(cx, nullptr, 0, flags, nullptr, atom, proto,
+                             allocKind, TenuredObject);
   if (!fun) {
     return nullptr;
   }
-  if (data.isSelfHosting) {
+  if (isSelfHosting) {
     fun->setIsSelfHostedBuiltin();
     MOZ_ASSERT(!fun->isInterpretedLazy());
   }
@@ -2053,11 +2041,8 @@ JSFunction* AllocNewFunction(JSContext* cx,
 JSFunction* ParserBase::newFunction(HandleAtom atom, FunctionSyntaxKind kind,
                                     GeneratorKind generatorKind,
                                     FunctionAsyncKind asyncKind) {
-  Rooted<FunctionCreationData> fcd(
-      cx_, GenerateFunctionCreationData(atom, kind, generatorKind, asyncKind,
-                                        options().selfHostingMode,
-                                        pc_->isFunctionBox()));
-  return AllocNewFunction(cx_, fcd);
+  return AllocNewFunction(cx_, atom, kind, generatorKind, asyncKind,
+                          options().selfHostingMode, pc_->isFunctionBox());
 }
 
 template <class ParseHandler, typename Unit>

js/src/frontend/Parser.h

@@ -1895,13 +1895,12 @@ mozilla::Maybe<LexicalScope::Data*> NewLexicalScopeData(
     JSContext* context, ParseContext::Scope& scope, LifoAlloc& alloc,
     ParseContext* pc);
 
-FunctionCreationData GenerateFunctionCreationData(
-    HandleAtom atom, FunctionSyntaxKind kind, GeneratorKind generatorKind,
-    FunctionAsyncKind asyncKind, bool isSelfHosting = false,
-    bool inFunctionBox = false);
-
-JSFunction* AllocNewFunction(JSContext* cx,
-                             Handle<FunctionCreationData> dataHandle);
+JSFunction* AllocNewFunction(JSContext* cx, HandleAtom atom,
+                             FunctionSyntaxKind kind,
+                             GeneratorKind generatorKind,
+                             FunctionAsyncKind asyncKind,
+                             bool isSelfHosting = false,
+                             bool inFunctionBox = false);
 
 } /* namespace frontend */
 } /* namespace js */

js/src/frontend/SharedContext.h

@@ -11,7 +11,6 @@
 #include "jstypes.h"
 
 #include "ds/InlineTable.h"
-#include "frontend/FunctionCreationData.h"
 #include "frontend/ParseNode.h"
 #include "vm/BytecodeUtil.h"
 #include "vm/JSFunction.h"