/*
******************************************************************************
*
-* Copyright (C) 1997-2003, International Business Machines
+* Copyright (C) 1997-2010, International Business Machines
* Corporation and others. All Rights Reserved.
*
******************************************************************************
#ifndef CMEMORY_H
#define CMEMORY_H
-#include "unicode/utypes.h"
+#include <stddef.h>
#include <string.h>
-
+#include "unicode/utypes.h"
+#include "unicode/localpointer.h"
#define uprv_memcpy(dst, src, size) U_STANDARD_CPP_NAMESPACE memcpy(dst, src, size)
#define uprv_memmove(dst, src, size) U_STANDARD_CPP_NAMESPACE memmove(dst, src, size)
void *t3;
} UAlignedMemory;
+/**
+ * Get the least significant bits of a pointer (a memory address).
+ * For example, with a mask of 3, the macro gets the 2 least significant bits,
+ * which will be 0 if the pointer is 32-bit (4-byte) aligned.
+ *
+ * ptrdiff_t is the most appropriate integer type to cast to.
+ * size_t should work too, since on most (or all?) platforms it has the same
+ * width as ptrdiff_t.
+ */
+#define U_POINTER_MASK_LSB(ptr, mask) (((ptrdiff_t)(char *)(ptr)) & (mask))
+
/**
* Get the amount of bytes that a pointer is off by from
- * the previous aligned pointer
+ * the previous UAlignedMemory-aligned pointer.
*/
-#define U_ALIGNMENT_OFFSET(ptr) (((size_t)ptr) & (sizeof(UAlignedMemory) - 1))
+#define U_ALIGNMENT_OFFSET(ptr) U_POINTER_MASK_LSB(ptr, sizeof(UAlignedMemory) - 1)
/**
* Get the amount of bytes to add to a pointer
- * in order to get the next aligned address
+ * in order to get the next UAlignedMemory-aligned address.
*/
#define U_ALIGNMENT_OFFSET_UP(ptr) (sizeof(UAlignedMemory) - U_ALIGNMENT_OFFSET(ptr))
U_CFUNC UBool
cmemory_cleanup(void);
+#ifdef XP_CPLUSPLUS
+
+U_NAMESPACE_BEGIN
+
+/**
+ * "Smart pointer" class, deletes memory via uprv_free().
+ * For most methods see the LocalPointerBase base class.
+ * Adds operator[] for array item access.
+ *
+ * @see LocalPointerBase
+ */
+template<typename T>
+class LocalMemory : public LocalPointerBase<T> {
+public:
+ /**
+ * Constructor takes ownership.
+ * @param p simple pointer to an array of T items that is adopted
+ */
+ explicit LocalMemory(T *p=NULL) : LocalPointerBase<T>(p) {}
+ /**
+ * Destructor deletes the memory it owns.
+ */
+ ~LocalMemory() {
+ uprv_free(LocalPointerBase<T>::ptr);
+ }
+ /**
+ * Deletes the array it owns,
+ * and adopts (takes ownership of) the one passed in.
+ * @param p simple pointer to an array of T items that is adopted
+ */
+ void adoptInstead(T *p) {
+ uprv_free(LocalPointerBase<T>::ptr);
+ LocalPointerBase<T>::ptr=p;
+ }
+ /**
+ * Deletes the array it owns, allocates a new one and reset its bytes to 0.
+ * Returns the new array pointer.
+ * If the allocation fails, then the current array is unchanged and
+ * this method returns NULL.
+ * @param newCapacity must be >0
+ * @return the allocated array pointer, or NULL if the allocation failed
+ */
+ inline T *allocateInsteadAndReset(int32_t newCapacity=1);
+ /**
+ * Deletes the array it owns and allocates a new one, copying length T items.
+ * Returns the new array pointer.
+ * If the allocation fails, then the current array is unchanged and
+ * this method returns NULL.
+ * @param newCapacity must be >0
+ * @param length number of T items to be copied from the old array to the new one;
+ * must be no more than the capacity of the old array,
+ * which the caller must track because the LocalMemory does not track it
+ * @return the allocated array pointer, or NULL if the allocation failed
+ */
+ inline T *allocateInsteadAndCopy(int32_t newCapacity=1, int32_t length=0);
+ /**
+ * Array item access (writable).
+ * No index bounds check.
+ * @param i array index
+ * @return reference to the array item
+ */
+ T &operator[](ptrdiff_t i) const { return LocalPointerBase<T>::ptr[i]; }
+};
+
+template<typename T>
+inline T *LocalMemory<T>::allocateInsteadAndReset(int32_t newCapacity) {
+ if(newCapacity>0) {
+ T *p=(T *)uprv_malloc(newCapacity*sizeof(T));
+ if(p!=NULL) {
+ uprv_memset(p, 0, newCapacity*sizeof(T));
+ uprv_free(LocalPointerBase<T>::ptr);
+ LocalPointerBase<T>::ptr=p;
+ }
+ return p;
+ } else {
+ return NULL;
+ }
+}
+
+
+template<typename T>
+inline T *LocalMemory<T>::allocateInsteadAndCopy(int32_t newCapacity, int32_t length) {
+ if(newCapacity>0) {
+ T *p=(T *)uprv_malloc(newCapacity*sizeof(T));
+ if(p!=NULL) {
+ if(length>0) {
+ if(length>newCapacity) {
+ length=newCapacity;
+ }
+ uprv_memcpy(p, LocalPointerBase<T>::ptr, length*sizeof(T));
+ }
+ uprv_free(LocalPointerBase<T>::ptr);
+ LocalPointerBase<T>::ptr=p;
+ }
+ return p;
+ } else {
+ return NULL;
+ }
+}
+
+/**
+ * Simple array/buffer management class using uprv_malloc() and uprv_free().
+ * Provides an internal array with fixed capacity. Can alias another array
+ * or allocate one.
+ *
+ * The array address is properly aligned for type T. It might not be properly
+ * aligned for types larger than T (or larger than the largest subtype of T).
+ *
+ * Unlike LocalMemory and LocalArray, this class never adopts
+ * (takes ownership of) another array.
+ */
+template<typename T, int32_t stackCapacity>
+class MaybeStackArray {
+public:
+ /**
+ * Default constructor initializes with internal T[stackCapacity] buffer.
+ */
+ MaybeStackArray() : ptr(stackArray), capacity(stackCapacity), needToRelease(FALSE) {}
+ /**
+ * Destructor deletes the array (if owned).
+ */
+ ~MaybeStackArray() { releaseArray(); }
+ /**
+ * Returns the array capacity (number of T items).
+ * @return array capacity
+ */
+ int32_t getCapacity() const { return capacity; }
+ /**
+ * Access without ownership change.
+ * @return the array pointer
+ */
+ T *getAlias() const { return ptr; }
+ /**
+ * Returns the array limit. Simple convenience method.
+ * @return getAlias()+getCapacity()
+ */
+ T *getArrayLimit() const { return getAlias()+capacity; }
+ /**
+ * Access without ownership change. Same as getAlias().
+ * A class instance can be used directly in expressions that take a T *.
+ * @return the array pointer
+ */
+ operator T *() const { return ptr; }
+ /**
+ * Array item access (writable).
+ * No index bounds check.
+ * @param i array index
+ * @return reference to the array item
+ */
+ T &operator[](ptrdiff_t i) { return ptr[i]; }
+ /**
+ * Deletes the array (if owned) and aliases another one, no transfer of ownership.
+ * If the arguments are illegal, then the current array is unchanged.
+ * @param otherArray must not be NULL
+ * @param otherCapacity must be >0
+ */
+ void aliasInstead(T *otherArray, int32_t otherCapacity) {
+ if(otherArray!=NULL && otherCapacity>0) {
+ releaseArray();
+ ptr=otherArray;
+ capacity=otherCapacity;
+ needToRelease=FALSE;
+ }
+ };
+ /**
+ * Deletes the array (if owned) and allocates a new one, copying length T items.
+ * Returns the new array pointer.
+ * If the allocation fails, then the current array is unchanged and
+ * this method returns NULL.
+ * @param newCapacity can be less than or greater than the current capacity;
+ * must be >0
+ * @param length number of T items to be copied from the old array to the new one
+ * @return the allocated array pointer, or NULL if the allocation failed
+ */
+ inline T *resize(int32_t newCapacity, int32_t length=0);
+ /**
+ * Gives up ownership of the array if owned, or else clones it,
+ * copying length T items; resets itself to the internal stack array.
+ * Returns NULL if the allocation failed.
+ * @param length number of T items to copy when cloning,
+ * and capacity of the clone when cloning
+ * @param resultCapacity will be set to the returned array's capacity (output-only)
+ * @return the array pointer;
+ * caller becomes responsible for deleting the array
+ * @draft ICU 4.4
+ */
+ inline T *orphanOrClone(int32_t length, int32_t &resultCapacity);
+private:
+ T *ptr;
+ int32_t capacity;
+ UBool needToRelease;
+ T stackArray[stackCapacity];
+ void releaseArray() {
+ if(needToRelease) {
+ uprv_free(ptr);
+ }
+ }
+ /* No comparison operators with other MaybeStackArray's. */
+ bool operator==(const MaybeStackArray & /*other*/) {return FALSE;};
+ bool operator!=(const MaybeStackArray & /*other*/) {return TRUE;};
+ /* No ownership transfer: No copy constructor, no assignment operator. */
+ MaybeStackArray(const MaybeStackArray & /*other*/) {};
+ void operator=(const MaybeStackArray & /*other*/) {};
+
+ // No heap allocation. Use only on the stack.
+ // (Declaring these functions private triggers a cascade of problems:
+ // MSVC insists on exporting an instantiation of MaybeStackArray, which
+ // requires that all functions be defined.
+ // An empty implementation of new() is rejected, it must return a value.
+ // Returning NULL is rejected by gcc for operator new.
+ // The expedient thing is just not to override operator new.
+ // While relatively pointless, heap allocated instances will function.
+ // static void * U_EXPORT2 operator new(size_t size);
+ // static void * U_EXPORT2 operator new[](size_t size);
+#if U_HAVE_PLACEMENT_NEW
+ // static void * U_EXPORT2 operator new(size_t, void *ptr);
+#endif
+};
+
+template<typename T, int32_t stackCapacity>
+inline T *MaybeStackArray<T, stackCapacity>::resize(int32_t newCapacity, int32_t length) {
+ if(newCapacity>0) {
+ T *p=(T *)uprv_malloc(newCapacity*sizeof(T));
+ if(p!=NULL) {
+ if(length>0) {
+ if(length>capacity) {
+ length=capacity;
+ }
+ if(length>newCapacity) {
+ length=newCapacity;
+ }
+ uprv_memcpy(p, ptr, length*sizeof(T));
+ }
+ releaseArray();
+ ptr=p;
+ capacity=newCapacity;
+ needToRelease=TRUE;
+ }
+ return p;
+ } else {
+ return NULL;
+ }
+}
+
+template<typename T, int32_t stackCapacity>
+inline T *MaybeStackArray<T, stackCapacity>::orphanOrClone(int32_t length, int32_t &resultCapacity) {
+ T *p;
+ if(needToRelease) {
+ p=ptr;
+ } else if(length<=0) {
+ return NULL;
+ } else {
+ if(length>capacity) {
+ length=capacity;
+ }
+ p=(T *)uprv_malloc(length*sizeof(T));
+ if(p==NULL) {
+ return NULL;
+ }
+ uprv_memcpy(p, ptr, length*sizeof(T));
+ }
+ resultCapacity=length;
+ ptr=stackArray;
+ capacity=stackCapacity;
+ needToRelease=FALSE;
+ return p;
+}
+
+/**
+ * Variant of MaybeStackArray that allocates a header struct and an array
+ * in one contiguous memory block, using uprv_malloc() and uprv_free().
+ * Provides internal memory with fixed array capacity. Can alias another memory
+ * block or allocate one.
+ * The stackCapacity is the number of T items in the internal memory,
+ * not counting the H header.
+ * Unlike LocalMemory and LocalArray, this class never adopts
+ * (takes ownership of) another memory block.
+ */
+template<typename H, typename T, int32_t stackCapacity>
+class MaybeStackHeaderAndArray {
+public:
+ /**
+ * Default constructor initializes with internal H+T[stackCapacity] buffer.
+ */
+ MaybeStackHeaderAndArray() : ptr(&stackHeader), capacity(stackCapacity), needToRelease(FALSE) {}
+ /**
+ * Destructor deletes the memory (if owned).
+ */
+ ~MaybeStackHeaderAndArray() { releaseMemory(); }
+ /**
+ * Returns the array capacity (number of T items).
+ * @return array capacity
+ */
+ int32_t getCapacity() const { return capacity; }
+ /**
+ * Access without ownership change.
+ * @return the header pointer
+ */
+ H *getAlias() const { return ptr; }
+ /**
+ * Returns the array start.
+ * @return array start, same address as getAlias()+1
+ */
+ T *getArrayStart() const { return reinterpret_cast<T *>(getAlias()+1); }
+ /**
+ * Returns the array limit.
+ * @return array limit
+ */
+ T *getArrayLimit() const { return getArrayStart()+capacity; }
+ /**
+ * Access without ownership change. Same as getAlias().
+ * A class instance can be used directly in expressions that take a T *.
+ * @return the header pointer
+ */
+ operator H *() const { return ptr; }
+ /**
+ * Array item access (writable).
+ * No index bounds check.
+ * @param i array index
+ * @return reference to the array item
+ */
+ T &operator[](ptrdiff_t i) { return getArrayStart()[i]; }
+ /**
+ * Deletes the memory block (if owned) and aliases another one, no transfer of ownership.
+ * If the arguments are illegal, then the current memory is unchanged.
+ * @param otherArray must not be NULL
+ * @param otherCapacity must be >0
+ */
+ void aliasInstead(H *otherMemory, int32_t otherCapacity) {
+ if(otherMemory!=NULL && otherCapacity>0) {
+ releaseMemory();
+ ptr=otherMemory;
+ capacity=otherCapacity;
+ needToRelease=FALSE;
+ }
+ };
+ /**
+ * Deletes the memory block (if owned) and allocates a new one,
+ * copying the header and length T array items.
+ * Returns the new header pointer.
+ * If the allocation fails, then the current memory is unchanged and
+ * this method returns NULL.
+ * @param newCapacity can be less than or greater than the current capacity;
+ * must be >0
+ * @param length number of T items to be copied from the old array to the new one
+ * @return the allocated pointer, or NULL if the allocation failed
+ */
+ inline H *resize(int32_t newCapacity, int32_t length=0);
+ /**
+ * Gives up ownership of the memory if owned, or else clones it,
+ * copying the header and length T array items; resets itself to the internal memory.
+ * Returns NULL if the allocation failed.
+ * @param length number of T items to copy when cloning,
+ * and array capacity of the clone when cloning
+ * @param resultCapacity will be set to the returned array's capacity (output-only)
+ * @return the header pointer;
+ * caller becomes responsible for deleting the array
+ * @draft ICU 4.4
+ */
+ inline H *orphanOrClone(int32_t length, int32_t &resultCapacity);
+private:
+ H *ptr;
+ int32_t capacity;
+ UBool needToRelease;
+ // stackHeader must precede stackArray immediately.
+ H stackHeader;
+ T stackArray[stackCapacity];
+ void releaseMemory() {
+ if(needToRelease) {
+ uprv_free(ptr);
+ }
+ }
+ /* No comparison operators with other MaybeStackHeaderAndArray's. */
+ bool operator==(const MaybeStackHeaderAndArray & /*other*/) {return FALSE;};
+ bool operator!=(const MaybeStackHeaderAndArray & /*other*/) {return TRUE;};
+ /* No ownership transfer: No copy constructor, no assignment operator. */
+ MaybeStackHeaderAndArray(const MaybeStackHeaderAndArray & /*other*/) {};
+ void operator=(const MaybeStackHeaderAndArray & /*other*/) {};
+
+ // No heap allocation. Use only on the stack.
+ // (Declaring these functions private triggers a cascade of problems;
+ // see the MaybeStackArray class for details.)
+ // static void * U_EXPORT2 operator new(size_t size);
+ // static void * U_EXPORT2 operator new[](size_t size);
+#if U_HAVE_PLACEMENT_NEW
+ // static void * U_EXPORT2 operator new(size_t, void *ptr);
#endif
+};
+
+template<typename H, typename T, int32_t stackCapacity>
+inline H *MaybeStackHeaderAndArray<H, T, stackCapacity>::resize(int32_t newCapacity,
+ int32_t length) {
+ if(newCapacity>=0) {
+ H *p=(H *)uprv_malloc(sizeof(H)+newCapacity*sizeof(T));
+ if(p!=NULL) {
+ if(length<0) {
+ length=0;
+ } else if(length>0) {
+ if(length>capacity) {
+ length=capacity;
+ }
+ if(length>newCapacity) {
+ length=newCapacity;
+ }
+ }
+ uprv_memcpy(p, ptr, sizeof(H)+length*sizeof(T));
+ releaseMemory();
+ ptr=p;
+ capacity=newCapacity;
+ needToRelease=TRUE;
+ }
+ return p;
+ } else {
+ return NULL;
+ }
+}
+
+template<typename H, typename T, int32_t stackCapacity>
+inline H *MaybeStackHeaderAndArray<H, T, stackCapacity>::orphanOrClone(int32_t length,
+ int32_t &resultCapacity) {
+ H *p;
+ if(needToRelease) {
+ p=ptr;
+ } else {
+ if(length<0) {
+ length=0;
+ } else if(length>capacity) {
+ length=capacity;
+ }
+ p=(H *)uprv_malloc(sizeof(H)+length*sizeof(T));
+ if(p==NULL) {
+ return NULL;
+ }
+ uprv_memcpy(p, ptr, sizeof(H)+length*sizeof(T));
+ }
+ resultCapacity=length;
+ ptr=&stackHeader;
+ capacity=stackCapacity;
+ needToRelease=FALSE;
+ return p;
+}
+
+U_NAMESPACE_END
+
+#endif /* XP_CPLUSPLUS */
+#endif /* CMEMORY_H */
projects / apple / icu.git / blobdiff