353fbd3516
Using fwrite and fread was very *very* slow. The resulting code was multiple times slower than GCC's implementation of gcov. Replace the fwrite/fread system with an mmap() version. If the `.gcda' file doesn't exist, we (re)allocate a buffer that we write into. That gets written to the `.gcda' file in one chunk. If the `.gcda' file already exists, we simply mmap() the file, modify the mapped data, and use msync() to write the contents out to disk. It's much easier than implementing our own buffering scheme, and we don't have to use fwrite's and fread's buffering. For those who are numbers-oriented, here are some timings: GCC Verison ----------- `.gcda' files don't exist: 23s `.gcda' files do exist: 14s LLVM Version (before this change) --------------------------------- `.gcda' files don't exist: 28s `.gcda' files do exist: 28s LLVM Version (with this change) ------------------------------- `.gcda' files don't exist: 18s `.gcda' files do exist: 4s It's a win-win-win-win-lose-win-win scenario! <rdar://problem/13466086> llvm-svn: 182563
90 lines
2.8 KiB
C
90 lines
2.8 KiB
C
/* ===-- stdio.h - stub SDK header for compiler-rt --------------------------===
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*
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* The LLVM Compiler Infrastructure
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*
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* This file is dual licensed under the MIT and the University of Illinois Open
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* Source Licenses. See LICENSE.TXT for details.
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*
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* ===-----------------------------------------------------------------------===
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*
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* This is a stub SDK header file. This file is not part of the interface of
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* this library nor an official version of the appropriate SDK header. It is
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* intended only to stub the features of this header required by compiler-rt.
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*
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* ===-----------------------------------------------------------------------===
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*/
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#ifndef __STDIO_H__
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#define __STDIO_H__
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#if defined(__cplusplus)
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extern "C" {
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#endif
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typedef struct __sFILE FILE;
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typedef __SIZE_TYPE__ size_t;
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/* Determine the appropriate fdopen, fopen(), and fwrite() functions. */
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#if defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__)
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# if defined(__i386)
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# define __FDOPEN_NAME "_fdopen$UNIX2003"
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# define __FOPEN_NAME "_fopen$UNIX2003"
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# define __FWRITE_NAME "_fwrite$UNIX2003"
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# elif defined(__x86_64__)
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# define __FDOPEN_NAME "_fdopen"
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# define __FOPEN_NAME "_fopen"
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# define __FWRITE_NAME "_fwrite"
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# elif defined(__arm)
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# define __FDOPEN_NAME "_fdopen"
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# define __FOPEN_NAME "_fopen"
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# define __FWRITE_NAME "_fwrite"
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# else
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# error "unrecognized architecture for targetting OS X"
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# endif
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#elif defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__)
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# if defined(__i386) || defined (__x86_64)
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# define __FDOPEN_NAME "_fdopen"
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# define __FOPEN_NAME "_fopen"
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# define __FWRITE_NAME "_fwrite"
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# elif defined(__arm)
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# define __FDOPEN_NAME "_fdopen"
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# define __FOPEN_NAME "_fopen"
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# define __FWRITE_NAME "_fwrite"
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# else
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# error "unrecognized architecture for targetting iOS"
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# endif
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#else
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# error "unrecognized architecture for targetting Darwin"
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#endif
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# define stderr __stderrp
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extern FILE *__stderrp;
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#ifndef SEEK_SET
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#define SEEK_SET 0 /* set file offset to offset */
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#endif
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#ifndef SEEK_CUR
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#define SEEK_CUR 1 /* set file offset to current plus offset */
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#endif
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#ifndef SEEK_END
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#define SEEK_END 2 /* set file offset to EOF plus offset */
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#endif
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int fclose(FILE *);
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int fflush(FILE *);
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FILE *fopen(const char * __restrict, const char * __restrict) __asm(__FOPEN_NAME);
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FILE *fdopen(int, const char *) __asm(__FDOPEN_NAME);
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int fprintf(FILE * __restrict, const char * __restrict, ...);
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size_t fwrite(const void * __restrict, size_t, size_t, FILE * __restrict)
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__asm(__FWRITE_NAME);
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size_t fread(void * __restrict, size_t, size_t, FILE * __restrict);
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long ftell(FILE *);
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int fseek(FILE *, long, int);
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int snprintf(char * __restrict, size_t, const char * __restrict, ...);
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __STDIO_H__ */
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