1// This file is part of the ustl library, an STL implementation. 2// 3// Copyright (C) 2005 by Mike Sharov <msharov@users.sourceforge.net> 4// This file is free software, distributed under the MIT License. 5// 6// cmemlink.cc 7// 8// See cmemlink.h for documentation. 9// 10 11#include "cmemlink.h" 12#include "ofstream.h" 13#include "strmsize.h" 14#include "ualgo.h" 15#include "uassert.h" 16 17#if PLATFORM_ANDROID 18#include <stdio.h> 19#undef CPU_HAS_MMX 20#endif 21 22namespace ustl { 23 24/// \brief Attaches the object to pointer \p p of size \p n. 25/// 26/// If \p p is NULL and \p n is non-zero, bad_alloc is thrown and current 27/// state remains unchanged. 28/// 29void cmemlink::link (const void* p, size_type n) 30{ 31 if (!p && n) 32#if PLATFORM_ANDROID 33 printf("bad alloc\n"); 34#else /* !PLATFORM_ANDROID */ 35 throw bad_alloc (n); 36#endif 37 unlink(); 38 relink (p, n); 39} 40 41/// Writes the object to stream \p os 42void cmemlink::write (ostream& os) const 43{ 44 const written_size_type sz (size()); 45 assert (sz == size() && "No support for writing memblocks larger than 4G"); 46 os << sz; 47 os.write (cdata(), sz); 48 os.align (alignof (sz)); 49} 50 51/// Writes the object to stream \p os 52void cmemlink::text_write (ostringstream& os) const 53{ 54 os.write (begin(), readable_size()); 55} 56 57/// Returns the number of bytes required to write this object to a stream. 58cmemlink::size_type cmemlink::stream_size (void) const 59{ 60 const written_size_type sz (size()); 61 return (Align (stream_size_of (sz) + sz, alignof(sz))); 62} 63 64/// Writes the data to file \p "filename". 65void cmemlink::write_file (const char* filename, int mode) const 66{ 67 fstream f; 68 f.exceptions (fstream::allbadbits); 69 f.open (filename, fstream::out | fstream::trunc, mode); 70 f.write (cdata(), readable_size()); 71 f.close(); 72} 73 74/// swaps the contents with \p l 75void cmemlink::swap (cmemlink& l) 76{ 77#if CPU_HAS_MMX && SIZE_OF_POINTER == 4 78 asm ( 79 "movq %0, %%mm0\n\t" 80 "movq %2, %%mm1\n\t" 81 "movq %%mm0, %2\n\t" 82 "movq %%mm1, %0" 83 : "=m"(m_Data), "=m"(m_Size), "=m"(l.m_Data), "=m"(l.m_Size) 84 : 85 : "mm0", "mm1", "st", "st(1)"); 86 simd::reset_mmx(); 87#elif CPU_HAS_SSE && SIZE_OF_POINTER == 8 88 asm ( 89 "movups %0, %%xmm0\n\t" 90 "movups %2, %%xmm1\n\t" 91 "movups %%xmm0, %2\n\t" 92 "movups %%xmm1, %0" 93 : "=m"(m_Data), "=m"(m_Size), "=m"(l.m_Data), "=m"(l.m_Size) 94 : 95 : "xmm0", "xmm1"); 96#else 97 ::ustl::swap (m_Data, l.m_Data); 98 ::ustl::swap (m_Size, l.m_Size); 99#endif 100} 101 102/// Compares to memory block pointed by l. Size is compared first. 103bool cmemlink::operator== (const cmemlink& l) const 104{ 105 return (l.m_Size == m_Size && 106 (l.m_Data == m_Data || 0 == memcmp (l.m_Data, m_Data, m_Size))); 107} 108 109} // namespace ustl 110 111