The Tor Browser: intl/icu/source/common/cmemory.h@129ffea94266 (annotated)

intl/icu/source/common/cmemory.h@129ffea94266 (annotated)

intl/icu/source/common/cmemory.h

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /*
 ******************************************************************************
 *
 *   Copyright (C) 1997-2012, 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
 #if U_DEBUG
 /*
  * The C++ standard requires that the source pointer for memcpy() & memmove()
  * is valid, not NULL, and not at the end of an allocated memory block.
  * In debug mode, we read one byte from the source point to verify that it's
  * a valid, readable pointer.
  */
 U_CAPI void uprv_checkValidMemory(const void *p, size_t n);
 #define uprv_memcpy(dst, src, size) ( \
     uprv_checkValidMemory(src, 1), \
     U_STANDARD_CPP_NAMESPACE memcpy(dst, src, size))
 #define uprv_memmove(dst, src, size) ( \
     uprv_checkValidMemory(src, 1), \
     U_STANDARD_CPP_NAMESPACE memmove(dst, src, size))
 #else
 #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)
 #endif  /* U_DEBUG */
 #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))
 /**
   *  Indicate whether the ICU allocation functions have been used.
   *  This is used to determine whether ICU is in an initial, unused state.
   */
 U_CFUNC UBool
 cmemory_inUse(void);
 /**
   *  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:
     /**
      * 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; }
     // 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);
         }
     }
     /* 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) {
 #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, 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, 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
      */
     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)+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)+length*sizeof(T));
     }
     resultCapacity=length;
     ptr=&stackHeader;
     capacity=stackCapacity;
     needToRelease=FALSE;
     return p;
 }
 U_NAMESPACE_END
 #endif  /* __cplusplus */
 #endif  /* CMEMORY_H */

The Tor Browser / annotate

intl/icu/source/common/cmemory.h@129ffea94266 (annotated)

intl/icu/source/common/cmemory.h