1 files changed, 82 insertions, 0 deletions
diff --git a/js/src/jit/ICStubSpace.h b/js/src/jit/ICStubSpace.h
new file mode 100644
index 000000000..30b9fbb45
--- /dev/null
+++ b/js/src/jit/ICStubSpace.h
@@ -0,0 +1,82 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * 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 jit_ICStubSpace_h
+#define jit_ICStubSpace_h
+
+#include "ds/LifoAlloc.h"
+
+namespace js {
+namespace jit {
+
+// ICStubSpace is an abstraction for allocation policy and storage for stub data.
+// There are two kinds of stubs: optimized stubs and fallback stubs (the latter
+// also includes stubs that can make non-tail calls that can GC).
+//
+// Optimized stubs are allocated per-compartment and are always purged when
+// JIT-code is discarded. Fallback stubs are allocated per BaselineScript and
+// are only destroyed when the BaselineScript is destroyed.
+class ICStubSpace
+{
+  protected:
+    LifoAlloc allocator_;
+
+    explicit ICStubSpace(size_t chunkSize)
+      : allocator_(chunkSize)
+    {}
+
+  public:
+    inline void* alloc(size_t size) {
+        return allocator_.alloc(size);
+    }
+
+    JS_DECLARE_NEW_METHODS(allocate, alloc, inline)
+
+    void freeAllAfterMinorGC(JSRuntime* rt);
+
+#ifdef DEBUG
+    bool isEmpty() const {
+        return allocator_.isEmpty();
+    }
+#endif
+
+    size_t sizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const {
+        return allocator_.sizeOfExcludingThis(mallocSizeOf);
+    }
+};
+
+// Space for optimized stubs. Every JitCompartment has a single
+// OptimizedICStubSpace.
+struct OptimizedICStubSpace : public ICStubSpace
+{
+    static const size_t STUB_DEFAULT_CHUNK_SIZE = 4096;
+
+  public:
+    OptimizedICStubSpace()
+      : ICStubSpace(STUB_DEFAULT_CHUNK_SIZE)
+    {}
+};
+
+// Space for fallback stubs. Every BaselineScript has a
+// FallbackICStubSpace.
+struct FallbackICStubSpace : public ICStubSpace
+{
+    static const size_t STUB_DEFAULT_CHUNK_SIZE = 4096;
+
+  public:
+    FallbackICStubSpace()
+      : ICStubSpace(STUB_DEFAULT_CHUNK_SIZE)
+    {}
+
+    inline void adoptFrom(FallbackICStubSpace* other) {
+        allocator_.steal(&(other->allocator_));
+    }
+};
+
+} // namespace jit
+} // namespace js
+
+#endif /* jit_ICStubSpace_h */