75 lines
3.6 KiB
C
75 lines
3.6 KiB
C
/*******************************************************************************
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Copyright (c) 2016, The OpenBLAS Project
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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3. Neither the name of the OpenBLAS project nor the names of
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its contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBLAS PROJECT OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*******************************************************************************/
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#define STACK_ALLOC_PROTECT
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#ifdef STACK_ALLOC_PROTECT
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// Try to detect stack smashing
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#include <assert.h>
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#define STACK_ALLOC_PROTECT_SET volatile int stack_check = 0x7fc01234;
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#define STACK_ALLOC_PROTECT_CHECK assert(stack_check == 0x7fc01234);
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#else
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#define STACK_ALLOC_PROTECT_SET
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#define STACK_ALLOC_PROTECT_CHECK
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#endif
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#if defined(MAX_STACK_ALLOC) && MAX_STACK_ALLOC > 0
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/*
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* Allocate a buffer on the stack if the size is smaller than MAX_STACK_ALLOC.
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* Stack allocation is much faster than blas_memory_alloc or malloc, particularly
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* when OpenBLAS is used from a multi-threaded application.
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* SIZE must be carefully chosen to be:
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* - as small as possible to maximize the number of stack allocation
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* - large enough to support all architectures and kernel
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* Choosing a SIZE too small will lead to a stack smashing.
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*/
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#define STACK_ALLOC(SIZE, TYPE, BUFFER) \
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/* make it volatile because some function (ex: dgemv_n.S) */ \
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/* do not restore all register */ \
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volatile int stack_alloc_size = SIZE; \
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if (stack_alloc_size > MAX_STACK_ALLOC / sizeof(TYPE)) stack_alloc_size = 0; \
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STACK_ALLOC_PROTECT_SET \
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/* Avoid declaring an array of length 0 */ \
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TYPE stack_buffer[stack_alloc_size ? stack_alloc_size : 1] \
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__attribute__((aligned(0x20))); \
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BUFFER = stack_alloc_size ? stack_buffer : (TYPE *)blas_memory_alloc(1);
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#else
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//Original OpenBLAS/GotoBLAS codes.
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#define STACK_ALLOC(SIZE, TYPE, BUFFER) BUFFER = (TYPE *)blas_memory_alloc(1)
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#endif
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#if defined(MAX_STACK_ALLOC) && MAX_STACK_ALLOC > 0
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#define STACK_FREE(BUFFER) \
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STACK_ALLOC_PROTECT_CHECK \
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if(!stack_alloc_size) \
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blas_memory_free(BUFFER);
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#else
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#define STACK_FREE(BUFFER) blas_memory_free(BUFFER)
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#endif
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