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-// © 2016 and later: Unicode, Inc. and others.
-// License & terms of use: http://www.unicode.org/copyright.html
-/*
-******************************************************************************
-*
-* Copyright (C) 1997-2016, International Business Machines
-* Corporation and others. All Rights Reserved.
-*
-******************************************************************************
-*
-* File CMEMORY.H
-*
-* Contains stdlib.h/string.h memory functions
-*
-* @author Bertrand A. Damiba
-*
-* Modification History:
-*
-* Date Name Description
-* 6/20/98 Bertrand Created.
-* 05/03/99 stephen Changed from functions to macros.
-*
-******************************************************************************
-*/
-
-#ifndef CMEMORY_H
-#define CMEMORY_H
-
-#include "unicode/utypes.h"
-
-#include <stddef.h>
-#include <string.h>
-#include "unicode/localpointer.h"
-
-#if U_DEBUG && defined(UPRV_MALLOC_COUNT)
-#include <stdio.h>
-#endif
-
-
-#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)
-
-/**
- * \def UPRV_LENGTHOF
- * Convenience macro to determine the length of a fixed array at compile-time.
- * @param array A fixed length array
- * @return The length of the array, in elements
- * @internal
- */
-#define UPRV_LENGTHOF(array) (int32_t)(sizeof(array)/sizeof((array)[0]))
-#define uprv_memset(buffer, mark, size) U_STANDARD_CPP_NAMESPACE memset(buffer, mark, size)
-#define uprv_memcmp(buffer1, buffer2, size) U_STANDARD_CPP_NAMESPACE memcmp(buffer1, buffer2,size)
-
-U_CAPI void * U_EXPORT2
-uprv_malloc(size_t s) U_MALLOC_ATTR U_ALLOC_SIZE_ATTR(1);
-
-U_CAPI void * U_EXPORT2
-uprv_realloc(void *mem, size_t size) U_ALLOC_SIZE_ATTR(2);
-
-U_CAPI void U_EXPORT2
-uprv_free(void *mem);
-
-U_CAPI void * U_EXPORT2
-uprv_calloc(size_t num, size_t size) U_MALLOC_ATTR U_ALLOC_SIZE_ATTR2(1,2);
-
-/**
- * This should align the memory properly on any machine.
- * This is very useful for the safeClone functions.
- */
-typedef union {
- long t1;
- double t2;
- 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 UAlignedMemory-aligned pointer.
- */
-#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 UAlignedMemory-aligned address.
- */
-#define U_ALIGNMENT_OFFSET_UP(ptr) (sizeof(UAlignedMemory) - U_ALIGNMENT_OFFSET(ptr))
-
-/**
- * Heap clean up function, called from u_cleanup()
- * Clears any user heap functions from u_setMemoryFunctions()
- * Does NOT deallocate any remaining allocated memory.
- */
-U_CFUNC UBool
-cmemory_cleanup(void);
-
-/**
- * A function called by <TT>uhash_remove</TT>,
- * <TT>uhash_close</TT>, or <TT>uhash_put</TT> to delete
- * an existing key or value.
- * @param obj A key or value stored in a hashtable
- * @see uprv_deleteUObject
- */
-typedef void U_CALLCONV UObjectDeleter(void* obj);
-
-/**
- * Deleter for UObject instances.
- * Works for all subclasses of UObject because it has a virtual destructor.
- */
-U_CAPI void U_EXPORT2
-uprv_deleteUObject(void *obj);
-
-#ifdef __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:
- using LocalPointerBase<T>::operator*;
- using LocalPointerBase<T>::operator->;
- /**
- * Constructor takes ownership.
- * @param p simple pointer to an array of T items that is adopted
- */
- explicit LocalMemory(T *p=NULL) : LocalPointerBase<T>(p) {}
- /**
- * Move constructor, leaves src with isNull().
- * @param src source smart pointer
- */
- LocalMemory(LocalMemory<T> &&src) U_NOEXCEPT : LocalPointerBase<T>(src.ptr) {
- src.ptr=NULL;
- }
- /**
- * Destructor deletes the memory it owns.
- */
- ~LocalMemory() {
- uprv_free(LocalPointerBase<T>::ptr);
- }
- /**
- * Move assignment operator, leaves src with isNull().
- * The behavior is undefined if *this and src are the same object.
- * @param src source smart pointer
- * @return *this
- */
- LocalMemory<T> &operator=(LocalMemory<T> &&src) U_NOEXCEPT {
- return moveFrom(src);
- }
- /**
- * Move assignment, leaves src with isNull().
- * The behavior is undefined if *this and src are the same object.
- *
- * Can be called explicitly, does not need C++11 support.
- * @param src source smart pointer
- * @return *this
- */
- LocalMemory<T> &moveFrom(LocalMemory<T> &src) U_NOEXCEPT {
- uprv_free(LocalPointerBase<T>::ptr);
- LocalPointerBase<T>::ptr=src.ptr;
- src.ptr=NULL;
- return *this;
- }
- /**
- * Swap pointers.
- * @param other other smart pointer
- */
- void swap(LocalMemory<T> &other) U_NOEXCEPT {
- T *temp=LocalPointerBase<T>::ptr;
- LocalPointerBase<T>::ptr=other.ptr;
- other.ptr=temp;
- }
- /**
- * Non-member LocalMemory swap function.
- * @param p1 will get p2's pointer
- * @param p2 will get p1's pointer
- */
- friend inline void swap(LocalMemory<T> &p1, LocalMemory<T> &p2) U_NOEXCEPT {
- p1.swap(p2);
- }
- /**
- * 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, (size_t)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.
- *
- * WARNING: MaybeStackArray only works with primitive (plain-old data) types.
- * It does NOT know how to call a destructor! If you work with classes with
- * destructors, consider LocalArray in localpointer.h.
- */
-template<typename T, int32_t stackCapacity>
-class MaybeStackArray {
-public:
- /**
- * Default constructor initializes with internal T[stackCapacity] buffer.
- */
- MaybeStackArray() : ptr(stackArray), capacity(stackCapacity), needToRelease(FALSE) {}
- /**
- * Automatically allocates the heap array if the argument is larger than the stack capacity.
- * Intended for use when an approximate capacity is known at compile time but the true
- * capacity is not known until runtime.
- */
- MaybeStackArray(int32_t newCapacity) : MaybeStackArray() {
- if (capacity < newCapacity) { resize(newCapacity); }
- };
- /**
- * Destructor deletes the array (if owned).
- */
- ~MaybeStackArray() { releaseArray(); }
- /**
- * Move constructor: transfers ownership or copies the stack array.
- */
- MaybeStackArray(MaybeStackArray<T, stackCapacity> &&src) U_NOEXCEPT;
- /**
- * Move assignment: transfers ownership or copies the stack array.
- */
- MaybeStackArray<T, stackCapacity> &operator=(MaybeStackArray<T, stackCapacity> &&src) U_NOEXCEPT;
- /**
- * 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; }
- // No "operator T *() const" because that can make
- // expressions like mbs[index] ambiguous for some compilers.
- /**
- * Array item access (const).
- * No index bounds check.
- * @param i array index
- * @return reference to the array item
- */
- const T &operator[](ptrdiff_t i) const { return ptr[i]; }
- /**
- * 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
- */
- 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);
- }
- }
- void resetToStackArray() {
- ptr=stackArray;
- capacity=stackCapacity;
- needToRelease=FALSE;
- }
- /* 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>
-icu::MaybeStackArray<T, stackCapacity>::MaybeStackArray(
- MaybeStackArray <T, stackCapacity>&& src) U_NOEXCEPT
- : ptr(src.ptr), capacity(src.capacity), needToRelease(src.needToRelease) {
- if (src.ptr == src.stackArray) {
- ptr = stackArray;
- uprv_memcpy(stackArray, src.stackArray, sizeof(T) * src.capacity);
- } else {
- src.resetToStackArray(); // take ownership away from src
- }
-}
-
-template<typename T, int32_t stackCapacity>
-inline MaybeStackArray <T, stackCapacity>&
-MaybeStackArray<T, stackCapacity>::operator=(MaybeStackArray <T, stackCapacity>&& src) U_NOEXCEPT {
- releaseArray(); // in case this instance had its own memory allocated
- capacity = src.capacity;
- needToRelease = src.needToRelease;
- if (src.ptr == src.stackArray) {
- ptr = stackArray;
- uprv_memcpy(stackArray, src.stackArray, sizeof(T) * src.capacity);
- } else {
- ptr = src.ptr;
- src.resetToStackArray(); // take ownership away from src
- }
- return *this;
-}
-
-template<typename T, int32_t stackCapacity>
-inline T *MaybeStackArray<T, stackCapacity>::resize(int32_t newCapacity, int32_t length) {
- if(newCapacity>0) {
-#if U_DEBUG && defined(UPRV_MALLOC_COUNT)
- ::fprintf(::stderr,"MaybeStacArray (resize) alloc %d * %lu\n", newCapacity,sizeof(T));
-#endif
- 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, (size_t)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 U_DEBUG && defined(UPRV_MALLOC_COUNT)
- ::fprintf(::stderr,"MaybeStacArray (orphan) alloc %d * %lu\n", length,sizeof(T));
-#endif
- if(p==NULL) {
- return NULL;
- }
- uprv_memcpy(p, ptr, (size_t)length*sizeof(T));
- }
- resultCapacity=length;
- resetToStackArray();
- 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
- */
- 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) {
-#if U_DEBUG && defined(UPRV_MALLOC_COUNT)
- ::fprintf(::stderr,"MaybeStackHeaderAndArray alloc %d + %d * %ul\n", sizeof(H),newCapacity,sizeof(T));
-#endif
- 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)+(size_t)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;
- }
-#if U_DEBUG && defined(UPRV_MALLOC_COUNT)
- ::fprintf(::stderr,"MaybeStackHeaderAndArray (orphan) alloc %ul + %d * %lu\n", sizeof(H),length,sizeof(T));
-#endif
- p=(H *)uprv_malloc(sizeof(H)+length*sizeof(T));
- if(p==NULL) {
- return NULL;
- }
- uprv_memcpy(p, ptr, sizeof(H)+(size_t)length*sizeof(T));
- }
- resultCapacity=length;
- ptr=&stackHeader;
- capacity=stackCapacity;
- needToRelease=FALSE;
- return p;
-}
-
-U_NAMESPACE_END
-
-#endif /* __cplusplus */
-#endif /* CMEMORY_H */