Add libc++ and libc++abi to third-party.

third_party/libc++abi/src/cxa_vector.cpp

+//===-------------------------- cxa_vector.cpp ---------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//  
+//  This file implements the "Array Construction and Destruction APIs"
+//  http://www.codesourcery.com/public/cxx-abi/abi.html#array-ctor
+//  
+//===----------------------------------------------------------------------===//
+
+#include "cxxabi.h"
+
+#include <exception>        // for std::terminate
+
+namespace __cxxabiv1 {
+
+#pragma mark --Helper routines and classes --
+
+namespace {
+    inline static size_t __get_element_count ( void *p ) {
+        return static_cast <size_t *> (p)[-1];
+        }
+
+    inline static void __set_element_count ( void *p, size_t element_count ) {
+        static_cast <size_t *> (p)[-1] = element_count;
+        }
+
+
+//  A pair of classes to simplify exception handling and control flow.
+//  They get passed a block of memory in the constructor, and unless the
+//  'release' method is called, they deallocate the memory in the destructor.
+//  Preferred usage is to allocate some memory, attach it to one of these objects,
+//  and then, when all the operations to set up the memory block have succeeded,
+//  call 'release'. If any of the setup operations fail, or an exception is
+//  thrown, then the block is automatically deallocated.
+//
+//  The only difference between these two classes is the signature for the
+//  deallocation function (to match new2/new3 and delete2/delete3.
+    class st_heap_block2 {
+    public:
+        typedef void (*dealloc_f)(void *);
+        
+        st_heap_block2 ( dealloc_f dealloc, void *ptr ) 
+            : dealloc_ ( dealloc ), ptr_ ( ptr ), enabled_ ( true ) {}
+        ~st_heap_block2 () { if ( enabled_ ) dealloc_ ( ptr_ ) ; }
+        void release () { enabled_ = false; }
+    
+    private:
+        dealloc_f dealloc_;
+        void *ptr_;
+        bool enabled_;
+    };
+    
+    class st_heap_block3 {
+    public:
+        typedef void (*dealloc_f)(void *, size_t);
+        
+        st_heap_block3 ( dealloc_f dealloc, void *ptr, size_t size ) 
+            : dealloc_ ( dealloc ), ptr_ ( ptr ), size_ ( size ), enabled_ ( true ) {}
+        ~st_heap_block3 () { if ( enabled_ ) dealloc_ ( ptr_, size_ ) ; }
+        void release () { enabled_ = false; }
+    
+    private:
+        dealloc_f dealloc_;
+        void *ptr_;
+        size_t size_;
+        bool enabled_;
+    };
+
+    class st_cxa_cleanup {
+    public:
+        typedef void (*destruct_f)(void *);
+        
+        st_cxa_cleanup ( void *ptr, size_t &idx, size_t element_size, destruct_f destructor )
+            : ptr_ ( ptr ), idx_ ( idx ), element_size_ ( element_size ), 
+                destructor_ ( destructor ), enabled_ ( true ) {}
+        ~st_cxa_cleanup () {
+            if ( enabled_ ) 
+                __cxa_vec_cleanup ( ptr_, idx_, element_size_, destructor_ );
+            }
+        
+        void release () { enabled_ = false; }
+    
+    private:
+        void *ptr_;
+        size_t &idx_;
+        size_t element_size_;
+        destruct_f destructor_;
+        bool enabled_;
+    };
+    
+    class st_terminate {
+    public:
+        st_terminate ( bool enabled = true ) : enabled_ ( enabled ) {}
+        ~st_terminate () { if ( enabled_ ) std::terminate (); }
+        void release () { enabled_ = false; }
+    private:
+        bool enabled_ ;
+    };
+}
+
+#pragma mark --Externally visible routines--
+
+extern "C" {
+
+// Equivalent to
+// 
+//   __cxa_vec_new2(element_count, element_size, padding_size, constructor,
+//                  destructor, &::operator new[], &::operator delete[])
+void* __cxa_vec_new(
+    size_t element_count, size_t element_size, size_t padding_size, 
+        void (*constructor)(void*), void (*destructor)(void*) ) {
+
+    return __cxa_vec_new2 ( element_count, element_size, padding_size, 
+        constructor, destructor, &::operator new [], &::operator delete [] );
+}
+
+
+
+// Given the number and size of elements for an array and the non-negative
+// size of prefix padding for a cookie, allocate space (using alloc) for
+// the array preceded by the specified padding, initialize the cookie if
+// the padding is non-zero, and call the given constructor on each element.
+// Return the address of the array proper, after the padding.
+// 
+// If alloc throws an exception, rethrow the exception. If alloc returns
+// NULL, return NULL. If the constructor throws an exception, call
+// destructor for any already constructed elements, and rethrow the
+// exception. If the destructor throws an exception, call std::terminate.
+// 
+// The constructor may be NULL, in which case it must not be called. If the
+// padding_size is zero, the destructor may be NULL; in that case it must
+// not be called.
+// 
+// Neither alloc nor dealloc may be NULL.
+void* __cxa_vec_new2(
+    size_t element_count, size_t element_size, size_t padding_size,
+        void  (*constructor)(void*), void  (*destructor)(void*),
+        void* (*alloc)(size_t), void  (*dealloc)(void*) ) {
+
+    const size_t heap_size = element_count * element_size + padding_size;
+    char * const heap_block = static_cast<char *> ( alloc ( heap_size ));
+    char *vec_base = heap_block;
+    
+    if ( NULL != vec_base ) {
+        st_heap_block2 heap ( dealloc, heap_block );
+
+    //  put the padding before the array elements
+        if ( 0 != padding_size ) {
+            vec_base += padding_size;
+            __set_element_count ( vec_base, element_count );
+        }
+            
+    //  Construct the elements
+        __cxa_vec_ctor ( vec_base, element_count, element_size, constructor, destructor );
+        heap.release ();    // We're good!
+    }
+    
+    return vec_base;
+}
+
+
+// Same as __cxa_vec_new2 except that the deallocation function takes both
+// the object address and its size.
+void* __cxa_vec_new3(
+    size_t element_count, size_t element_size, size_t padding_size,
+        void  (*constructor)(void*), void  (*destructor)(void*),
+        void* (*alloc)(size_t), void  (*dealloc)(void*, size_t) ) {
+
+    const size_t heap_size = element_count * element_size + padding_size;
+    char * const heap_block = static_cast<char *> ( alloc ( heap_size ));
+    char *vec_base = heap_block;
+    
+    if ( NULL != vec_base ) {
+        st_heap_block3 heap ( dealloc, heap_block, heap_size );
+
+    //  put the padding before the array elements
+        if ( 0 != padding_size ) {
+            vec_base += padding_size;
+            __set_element_count ( vec_base, element_count );
+        }
+            
+    //  Construct the elements
+        __cxa_vec_ctor ( vec_base, element_count, element_size, constructor, destructor );
+        heap.release ();    // We're good!
+    }
+    
+    return vec_base;
+}
+ 
+ 
+// Given the (data) addresses of a destination and a source array, an
+// element count and an element size, call the given copy constructor to
+// copy each element from the source array to the destination array. The
+// copy constructor's arguments are the destination address and source
+// address, respectively. If an exception occurs, call the given destructor
+// (if non-NULL) on each copied element and rethrow. If the destructor
+// throws an exception, call terminate(). The constructor and or destructor
+// pointers may be NULL. If either is NULL, no action is taken when it
+// would have been called.
+
+void __cxa_vec_cctor( void*  dest_array, void*  src_array, 
+    size_t element_count, size_t element_size, 
+        void  (*constructor) (void*, void*), void  (*destructor)(void*) ) {
+
+    if ( NULL != constructor ) {
+        size_t idx = 0;
+        char *src_ptr  = static_cast<char *>(src_array);
+        char *dest_ptr = static_cast<char *>(dest_array);
+        st_cxa_cleanup cleanup ( dest_array, idx, element_size, destructor );        
+
+        for ( idx = 0; idx < element_count; 
+                    ++idx, src_ptr += element_size, dest_ptr += element_size )
+            constructor ( dest_ptr, src_ptr );
+        cleanup.release ();     // We're good!
+    }
+}
+
+
+// Given the (data) address of an array, not including any cookie padding,
+// and the number and size of its elements, call the given constructor on
+// each element. If the constructor throws an exception, call the given
+// destructor for any already-constructed elements, and rethrow the
+// exception. If the destructor throws an exception, call terminate(). The
+// constructor and/or destructor pointers may be NULL. If either is NULL,
+// no action is taken when it would have been called.
+void __cxa_vec_ctor(
+    void*  array_address, size_t element_count, size_t element_size, 
+       void (*constructor)(void*), void (*destructor)(void*) ) {
+
+    if ( NULL != constructor ) {
+        size_t idx;
+        char *ptr = static_cast <char *> ( array_address );
+        st_cxa_cleanup cleanup ( array_address, idx, element_size, destructor );        
+        
+    //  Construct the elements
+        for ( idx = 0; idx < element_count; ++idx, ptr += element_size )
+            constructor ( ptr );
+        cleanup.release ();     // We're good!
+    }
+}
+
+// Given the (data) address of an array, the number of elements, and the
+// size of its elements, call the given destructor on each element. If the
+// destructor throws an exception, rethrow after destroying the remaining
+// elements if possible. If the destructor throws a second exception, call
+// terminate(). The destructor pointer may be NULL, in which case this
+// routine does nothing.
+void __cxa_vec_dtor(
+    void*  array_address, size_t element_count, size_t element_size, 
+       void (*destructor)(void*) ) {
+    
+    if ( NULL != destructor ) {
+        char *ptr = static_cast <char *> (array_address);
+        size_t idx = element_count;
+        st_cxa_cleanup cleanup ( array_address, idx, element_size, destructor );        
+        {
+            st_terminate exception_guard (__cxa_uncaught_exception ());
+            ptr +=  element_count * element_size;   // one past the last element
+
+            while ( idx-- > 0 ) {
+                ptr -= element_size;
+                destructor ( ptr );
+            }
+            exception_guard.release (); //  We're good !
+        }
+        cleanup.release ();     // We're still good!
+    }
+}
+
+// Given the (data) address of an array, the number of elements, and the
+// size of its elements, call the given destructor on each element. If the
+// destructor throws an exception, call terminate(). The destructor pointer
+// may be NULL, in which case this routine does nothing.
+void __cxa_vec_cleanup( void* array_address, size_t element_count,
+        size_t element_size, void  (*destructor)(void*) ) {
+
+    if ( NULL != destructor ) {
+        char *ptr = static_cast <char *> (array_address);
+        size_t idx = element_count;
+        st_terminate exception_guard;
+        
+        ptr += element_count * element_size;    // one past the last element
+        while ( idx-- > 0 ) {
+            ptr -= element_size;
+            destructor ( ptr );
+            }
+        exception_guard.release ();     // We're done!
+    }
+}
+
+
+// If the array_address is NULL, return immediately. Otherwise, given the
+// (data) address of an array, the non-negative size of prefix padding for
+// the cookie, and the size of its elements, call the given destructor on
+// each element, using the cookie to determine the number of elements, and
+// then delete the space by calling ::operator delete[](void *). If the
+// destructor throws an exception, rethrow after (a) destroying the
+// remaining elements, and (b) deallocating the storage. If the destructor
+// throws a second exception, call terminate(). If padding_size is 0, the
+// destructor pointer must be NULL. If the destructor pointer is NULL, no
+// destructor call is to be made.
+// 
+// The intent of this function is to permit an implementation to call this
+// function when confronted with an expression of the form delete[] p in
+// the source code, provided that the default deallocation function can be
+// used. Therefore, the semantics of this function are consistent with
+// those required by the standard. The requirement that the deallocation
+// function be called even if the destructor throws an exception derives
+// from the resolution to DR 353 to the C++ standard, which was adopted in
+// April, 2003.
+void __cxa_vec_delete( void* array_address,
+        size_t element_size, size_t padding_size, void  (*destructor)(void*) ) {
+
+    __cxa_vec_delete2 ( array_address, element_size, padding_size,
+               destructor, &::operator delete [] );
+}
+
+
+// Same as __cxa_vec_delete, except that the given function is used for
+// deallocation instead of the default delete function. If dealloc throws
+// an exception, the result is undefined. The dealloc pointer may not be
+// NULL.
+void __cxa_vec_delete2( void* array_address,
+        size_t element_size, size_t padding_size, 
+        void  (*destructor)(void*), void  (*dealloc)(void*) ) {
+
+    if ( NULL != array_address ) {
+        char *vec_base   = static_cast <char *> (array_address);
+        char *heap_block = vec_base - padding_size;
+        st_heap_block2 heap ( dealloc, heap_block );
+        
+        if ( 0 != padding_size && NULL != destructor ) // call the destructors
+            __cxa_vec_dtor ( array_address, __get_element_count ( vec_base ), 
+                                    element_size, destructor );
+    }
+}
+
+
+// Same as __cxa_vec_delete, except that the given function is used for
+// deallocation instead of the default delete function. The deallocation
+// function takes both the object address and its size. If dealloc throws
+// an exception, the result is undefined. The dealloc pointer may not be
+// NULL.
+void __cxa_vec_delete3( void* array_address, 
+        size_t element_size, size_t padding_size, 
+        void  (*destructor)(void*), void  (*dealloc) (void*, size_t)) {
+
+    if ( NULL != array_address ) {
+        char *vec_base   = static_cast <char *> (array_address);
+        char *heap_block = vec_base - padding_size;
+        const size_t element_count = padding_size ? __get_element_count ( vec_base ) : 0;
+        const size_t heap_block_size = element_size * element_count + padding_size;
+        st_heap_block3 heap ( dealloc, heap_block, heap_block_size );
+
+        if ( 0 != padding_size && NULL != destructor ) // call the destructors
+            __cxa_vec_dtor ( array_address, element_count, element_size, destructor );
+    }
+}
+
+
+}  // extern "C"
+
+}  // abi