From 75db97cb3772fc0693947ec17c5954a04cb234a8 Mon Sep 17 00:00:00 2001
From: janekptacijarabaci <janekptacijarabaci@seznam.cz>
Date: Mon, 19 Mar 2018 14:48:24 +0100
Subject: Bug 1320388: Move JSFunction::HAS_REST to JSScript and LazyScript

Issue #78
[Depends on] Bug 883377: Implement ES6 function "name" property
semantics
---
 js/src/frontend/BytecodeEmitter.cpp | 6 +++---
 js/src/frontend/Parser.cpp          | 8 ++++----
 js/src/frontend/SharedContext.h     | 8 +++++++-
 3 files changed, 14 insertions(+), 8 deletions(-)

(limited to 'js/src/frontend')

diff --git a/js/src/frontend/BytecodeEmitter.cpp b/js/src/frontend/BytecodeEmitter.cpp
index 1e9d8f224..6ceb3ed7a 100644
--- a/js/src/frontend/BytecodeEmitter.cpp
+++ b/js/src/frontend/BytecodeEmitter.cpp
@@ -1053,7 +1053,7 @@ BytecodeEmitter::EmitterScope::enterFunction(BytecodeEmitter* bce, FunctionBox*
             if (p) {
                 MOZ_ASSERT(bi.kind() == BindingKind::FormalParameter);
                 MOZ_ASSERT(!funbox->hasDestructuringArgs);
-                MOZ_ASSERT(!funbox->function()->hasRest());
+                MOZ_ASSERT(!funbox->hasRest());
                 p->value() = loc;
                 continue;
             }
@@ -8017,7 +8017,7 @@ BytecodeEmitter::isRestParameter(ParseNode* pn, bool* result)
 
     FunctionBox* funbox = sc->asFunctionBox();
     RootedFunction fun(cx, funbox->function());
-    if (!fun->hasRest()) {
+    if (!funbox->hasRest()) {
         *result = false;
         return true;
     }
@@ -8960,7 +8960,7 @@ BytecodeEmitter::emitFunctionFormalParameters(ParseNode* pn)
     EmitterScope* funScope = innermostEmitterScope;
 
     bool hasParameterExprs = funbox->hasParameterExprs;
-    bool hasRest = funbox->function()->hasRest();
+    bool hasRest = funbox->hasRest();
 
     uint16_t argSlot = 0;
     for (ParseNode* arg = pn->pn_head; arg != funBody; arg = arg->pn_next, argSlot++) {
diff --git a/js/src/frontend/Parser.cpp b/js/src/frontend/Parser.cpp
index f42546eb5..78e47ceb3 100644
--- a/js/src/frontend/Parser.cpp
+++ b/js/src/frontend/Parser.cpp
@@ -465,6 +465,7 @@ FunctionBox::FunctionBox(ExclusiveContext* cx, LifoAlloc& alloc, ObjectBox* trac
     usesApply(false),
     usesThis(false),
     usesReturn(false),
+    hasRest_(false),
     funCxFlags()
 {
     // Functions created at parse time may be set singleton after parsing and
@@ -477,7 +478,6 @@ void
 FunctionBox::initFromLazyFunction()
 {
     JSFunction* fun = function();
-    length = fun->nargs() - fun->hasRest();
     if (fun->lazyScript()->isDerivedClassConstructor())
         setDerivedClassConstructor();
     if (fun->lazyScript()->needsHomeObject())
@@ -492,8 +492,6 @@ FunctionBox::initStandaloneFunction(Scope* enclosingScope)
     // Standalone functions are Function or Generator constructors and are
     // always scoped to the global.
     MOZ_ASSERT(enclosingScope->is<GlobalScope>());
-    JSFunction* fun = function();
-    length = fun->nargs() - fun->hasRest();
     enclosingScope_ = enclosingScope;
     allowNewTarget_ = true;
     thisBinding_ = ThisBinding::Function;
@@ -2214,6 +2212,8 @@ Parser<SyntaxParseHandler>::finishFunction()
         lazy->setStrict();
     lazy->setGeneratorKind(funbox->generatorKind());
     lazy->setAsyncKind(funbox->asyncKind());
+    if (funbox->hasRest())
+        lazy->setHasRest();
     if (funbox->isLikelyConstructorWrapper())
         lazy->setLikelyConstructorWrapper();
     if (funbox->isDerivedClassConstructor())
@@ -2757,7 +2757,7 @@ Parser<ParseHandler>::functionArguments(YieldHandling yieldHandling, FunctionSyn
                 }
 
                 hasRest = true;
-                funbox->function()->setHasRest();
+                funbox->setHasRest();
 
                 if (!tokenStream.getToken(&tt))
                     return false;
diff --git a/js/src/frontend/SharedContext.h b/js/src/frontend/SharedContext.h
index 39df47c20..a6ac542f6 100644
--- a/js/src/frontend/SharedContext.h
+++ b/js/src/frontend/SharedContext.h
@@ -471,6 +471,7 @@ class FunctionBox : public ObjectBox, public SharedContext
     bool            usesApply:1;            /* contains an f.apply() call */
     bool            usesThis:1;             /* contains 'this' */
     bool            usesReturn:1;           /* contains a 'return' statement */
+    bool            hasRest_:1;             /* has rest parameter */
 
     FunctionContextFlags funCxFlags;
 
@@ -539,6 +540,11 @@ class FunctionBox : public ObjectBox, public SharedContext
     bool isAsync() const { return asyncKind() == AsyncFunction; }
     bool isArrow() const { return function()->isArrow(); }
 
+    bool hasRest() const { return hasRest_; }
+    void setHasRest() {
+        hasRest_ = true;
+    }
+
     void setGeneratorKind(GeneratorKind kind) {
         // A generator kind can be set at initialization, or when "yield" is
         // first seen.  In both cases the transition can only happen from
@@ -567,7 +573,7 @@ class FunctionBox : public ObjectBox, public SharedContext
     void setHasInnerFunctions()            { funCxFlags.hasInnerFunctions         = true; }
 
     bool hasSimpleParameterList() const {
-        return !function()->hasRest() && !hasParameterExprs && !hasDestructuringArgs;
+        return !hasRest() && !hasParameterExprs && !hasDestructuringArgs;
     }
 
     bool hasMappedArgsObj() const {
-- 
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