#ifndef LLVM_SUPPORT_ALLOCATOR_H
#define LLVM_SUPPORT_ALLOCATOR_H
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/StringRef.h"
#include "llvm/Support/AlignOf.h"
+#include "llvm/Support/DataTypes.h"
#include "llvm/Support/MathExtras.h"
-#include "llvm/System/DataTypes.h"
#include <algorithm>
#include <cassert>
-#include <cstdlib>
#include <cstddef>
+#include <cstdlib>
namespace llvm {
+template <typename T> struct ReferenceAdder { typedef T& result; };
+template <typename T> struct ReferenceAdder<T&> { typedef T result; };
class MallocAllocator {
public:
public:
MallocSlabAllocator() : Allocator() { }
virtual ~MallocSlabAllocator();
- virtual MemSlab *Allocate(size_t Size);
- virtual void Deallocate(MemSlab *Slab);
+ virtual MemSlab *Allocate(size_t Size) LLVM_OVERRIDE;
+ virtual void Deallocate(MemSlab *Slab) LLVM_OVERRIDE;
};
/// BumpPtrAllocator - This allocator is useful for containers that need
/// allocating memory, and never deletes it until the entire block is dead. This
/// makes allocation speedy, but must only be used when the trade-off is ok.
class BumpPtrAllocator {
- BumpPtrAllocator(const BumpPtrAllocator &); // do not implement
- void operator=(const BumpPtrAllocator &); // do not implement
+ BumpPtrAllocator(const BumpPtrAllocator &) LLVM_DELETED_FUNCTION;
+ void operator=(const BumpPtrAllocator &) LLVM_DELETED_FUNCTION;
/// SlabSize - Allocate data into slabs of this size unless we get an
/// allocation above SizeThreshold.
/// allocate a separate slab.
size_t SizeThreshold;
+ /// \brief the default allocator used if one is not provided
+ MallocSlabAllocator DefaultSlabAllocator;
+
/// Allocator - The underlying allocator we use to get slabs of memory. This
/// defaults to MallocSlabAllocator, which wraps malloc, but it could be
/// changed to use a custom allocator.
/// one.
void DeallocateSlabs(MemSlab *Slab);
- static MallocSlabAllocator DefaultSlabAllocator;
-
+ template<typename T> friend class SpecificBumpPtrAllocator;
public:
- typedef void (*DTorFunction)(void*);
- BumpPtrAllocator(size_t size = 4096, size_t threshold = 4096,
- SlabAllocator &allocator = DefaultSlabAllocator);
+ BumpPtrAllocator(size_t size = 4096, size_t threshold = 4096);
+ BumpPtrAllocator(size_t size, size_t threshold, SlabAllocator &allocator);
~BumpPtrAllocator();
/// Reset - Deallocate all but the current slab and reset the current pointer
/// to the beginning of it, freeing all memory allocated so far.
void Reset();
- /// Reset - like Reset(), but call DTorFunction for each allocated
- /// object. This assumes that all objects allocated with this allocator
- /// had the same size and alignment specified here.
- void Reset(size_t Size, size_t Alignment, DTorFunction DTor);
-
/// Allocate - Allocate space at the specified alignment.
///
void *Allocate(size_t Size, size_t Alignment);
unsigned GetNumSlabs() const;
void PrintStats() const;
+
+
+ /// Allocate space and copy content into it.
+ void *allocateCopy(const void *Src, size_t Size, size_t Alignment=1) {
+ void *P = Allocate(Size, Alignment);
+ memcpy(P, Src, Size);
+ return P;
+ }
+
+ /// Allocate space for an array of type T, and use std::copy()
+ /// to copy the array contents.
+ template <typename T>
+ typename enable_if<isPodLike<T>, T*>::type
+ allocateCopy(const T Src[], size_t Num) {
+ T *P = Allocate<T>(Num);
+ std::copy(Src, &Src[Num], P);
+ return P;
+ }
+
+ /// Copy a StringRef by allocating copy in BumpPtrAllocator.
+ StringRef allocateCopy(StringRef Str) {
+ size_t Length = Str.size();
+ char *P = allocateCopy<char>(Str.data(), Length);
+ return StringRef(P, Length);
+ }
+
+ /// Copy a ArrayRef<T> by allocating copy in BumpPtrAllocator.
+ template <typename T>
+ typename enable_if<isPodLike<T>, ArrayRef<T> >::type
+ allocateCopy(ArrayRef<T> Src) {
+ size_t Length = Src.size();
+ T *P = allocateCopy<T>(Src.data(), Length);
+ return makeArrayRef(P, Length);
+ }
+
+ /// Compute the total physical memory allocated by this allocator.
+ size_t getTotalMemory() const;
+};
+
+/// SpecificBumpPtrAllocator - Same as BumpPtrAllocator but allows only
+/// elements of one type to be allocated. This allows calling the destructor
+/// in DestroyAll() and when the allocator is destroyed.
+template <typename T>
+class SpecificBumpPtrAllocator {
+ BumpPtrAllocator Allocator;
+public:
+ SpecificBumpPtrAllocator(size_t size = 4096, size_t threshold = 4096)
+ : Allocator(size, threshold) {}
+ SpecificBumpPtrAllocator(size_t size, size_t threshold,
+ SlabAllocator &allocator)
+ : Allocator(size, threshold, allocator) {}
+
+ ~SpecificBumpPtrAllocator() {
+ DestroyAll();
+ }
+
+ /// Call the destructor of each allocated object and deallocate all but the
+ /// current slab and reset the current pointer to the beginning of it, freeing
+ /// all memory allocated so far.
+ void DestroyAll() {
+ MemSlab *Slab = Allocator.CurSlab;
+ while (Slab) {
+ char *End = Slab == Allocator.CurSlab ? Allocator.CurPtr :
+ (char *)Slab + Slab->Size;
+ for (char *Ptr = (char*)(Slab+1); Ptr < End; Ptr += sizeof(T)) {
+ Ptr = Allocator.AlignPtr(Ptr, alignOf<T>());
+ if (Ptr + sizeof(T) <= End)
+ reinterpret_cast<T*>(Ptr)->~T();
+ }
+ Slab = Slab->NextPtr;
+ }
+ Allocator.Reset();
+ }
+
+ /// Allocate space for a specific count of elements.
+ T *Allocate(size_t num = 1) {
+ return Allocator.Allocate<T>(num);
+ }
};
} // end namespace llvm
inline void *operator new(size_t Size, llvm::BumpPtrAllocator &Allocator) {
struct S {
char c;
-#ifdef __GNUC__
- char x __attribute__((aligned));
-#else
union {
double D;
long double LD;
long long L;
void *P;
} x;
-#endif
};
return Allocator.Allocate(Size, std::min((size_t)llvm::NextPowerOf2(Size),
offsetof(S, x)));
}
+inline void operator delete(void *, llvm::BumpPtrAllocator &) {}
+
#endif // LLVM_SUPPORT_ALLOCATOR_H
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