michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0:  * vim: set ts=8 sts=4 et sw=4 tw=99:
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef jit_CompilerRoot_h
michael@0: #define jit_CompilerRoot_h
michael@0: 
michael@0: #ifdef JS_ION
michael@0: 
michael@0: #include "jscntxt.h"
michael@0: 
michael@0: #include "jit/Ion.h"
michael@0: #include "jit/IonAllocPolicy.h"
michael@0: #include "js/RootingAPI.h"
michael@0: 
michael@0: namespace js {
michael@0: namespace jit {
michael@0: 
michael@0: // Roots a read-only GCThing for the lifetime of a single compilation.
michael@0: // Each root is maintained in a linked list that is walked over during tracing.
michael@0: // The CompilerRoot must be heap-allocated and may not go out of scope.
michael@0: template <typename T>
michael@0: class CompilerRoot : public CompilerRootNode
michael@0: {
michael@0:   public:
michael@0:     CompilerRoot(T ptr)
michael@0:       : CompilerRootNode(nullptr)
michael@0:     {
michael@0:         if (ptr) {
michael@0:             JS_ASSERT(!GetIonContext()->runtime->isInsideNursery(ptr));
michael@0:             setRoot(ptr);
michael@0:         }
michael@0:     }
michael@0: 
michael@0:   public:
michael@0:     // Sets the pointer and inserts into root list. The pointer becomes read-only.
michael@0:     void setRoot(T root) {
michael@0:         CompilerRootNode *&rootList = GetIonContext()->temp->rootList();
michael@0: 
michael@0:         JS_ASSERT(!ptr_);
michael@0:         ptr_ = root;
michael@0:         next = rootList;
michael@0:         rootList = this;
michael@0:     }
michael@0: 
michael@0:   public:
michael@0:     operator T () const { return static_cast<T>(ptr_); }
michael@0:     T operator ->() const { return static_cast<T>(ptr_); }
michael@0: 
michael@0:   private:
michael@0:     CompilerRoot() MOZ_DELETE;
michael@0:     CompilerRoot(const CompilerRoot<T> &) MOZ_DELETE;
michael@0:     CompilerRoot<T> &operator =(const CompilerRoot<T> &) MOZ_DELETE;
michael@0: };
michael@0: 
michael@0: typedef CompilerRoot<JSObject*> CompilerRootObject;
michael@0: typedef CompilerRoot<JSFunction*> CompilerRootFunction;
michael@0: typedef CompilerRoot<JSScript*> CompilerRootScript;
michael@0: typedef CompilerRoot<PropertyName*> CompilerRootPropertyName;
michael@0: typedef CompilerRoot<Shape*> CompilerRootShape;
michael@0: typedef CompilerRoot<Value> CompilerRootValue;
michael@0: 
michael@0: } // namespace jit
michael@0: } // namespace js
michael@0: 
michael@0: #endif // JS_ION
michael@0: 
michael@0: #endif /* jit_CompilerRoot_h */