| 1 | //
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
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| 3 | //
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| 4 | // The contents of this file are covered under the licence agreement in the
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| 5 | // file "LICENCE" distributed with Cforall.
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| 6 | //
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| 7 | // as.c --
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| 8 | //
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| 9 | // Author : Peter A. Buhr
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| 10 | // Created On : Wed Aug 1 10:49:42 2018
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| 11 | // Last Modified By : Peter A. Buhr
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| 12 | // Last Modified On : Thu Aug 2 17:50:09 2018
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| 13 | // Update Count : 90
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| 14 | //
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| 15 |
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| 16 | #include <cstdio> // perror
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| 17 | #include <cstdlib> // exit
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| 18 | #include <fcntl.h> // open
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| 19 | #include <unistd.h>
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| 20 | #include <sys/stat.h>
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| 21 | #include <sys/mman.h> // mmap
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| 22 | #include <string.h>
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| 23 |
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| 24 | //#define __DEBUG_H__
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| 25 |
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| 26 | int main( const int argc, const char * argv[] ) {
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| 27 | #ifdef __DEBUG_H__
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| 28 | for ( int i = 0; i < argc; i += 1 ) {
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| 29 | cerr << argv[i] << endl;
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| 30 | } // for
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| 31 | #endif // __DEBUG_H__
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| 32 |
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| 33 | int fd = open( argv[argc - 1], O_RDWR );
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| 34 | if ( fd < 0 ) { perror( "open" ); exit( EXIT_FAILURE ); };
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| 35 |
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| 36 | struct stat mystat = {};
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| 37 | if ( fstat( fd, &mystat ) ) { perror( "fstat" ); exit( EXIT_FAILURE ); };
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| 38 | off_t size = mystat.st_size;
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| 39 |
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| 40 | char * start = (char *)mmap( NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0 );
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| 41 | if ( start == (void *)-1 ) { perror( "mmap" ); exit( EXIT_FAILURE ); };
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| 42 |
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| 43 | if ( char * cursor = strstr( start, ".Ldebug_info0:" ) ) { // debug information ?
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| 44 | // Expand file by one byte to hold 2 character Cforall language code.
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| 45 | if ( ftruncate( fd, size + 1 ) ) { perror( "ftruncate" ); exit( EXIT_FAILURE ); };
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| 46 |
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| 47 | for ( int i = 0; i < 8; i += 1 ) { // move N (magic) lines forward
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| 48 | cursor = strstr( cursor, "\n" ) + 1;
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| 49 | } // for
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| 50 |
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| 51 | cursor -= 2; // backup over "c\n" language value
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| 52 | if ( *(cursor - 1) != 'x' ) { fprintf( stderr, "invalid C language code\n" ); exit( EXIT_FAILURE ); };
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| 53 |
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| 54 | memmove( cursor + 2, cursor + 1, start + size - cursor - 1 ); // move remaining text 1 character right
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| 55 |
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| 56 | *(cursor) = '2'; // replace C language value with CFA
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| 57 | *(cursor + 1) = '5';
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| 58 | } // if
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| 59 |
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| 60 | if ( munmap( start, size ) ) { perror( "munmap" ); exit( EXIT_FAILURE ); }; // update on disk
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| 61 |
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| 62 | argv[0] = "as";
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| 63 | execvp( argv[0], (char * const *)argv ); // should not return
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| 64 | perror( "CFA Translator error: cpp level, execvp" );
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| 65 | exit( EXIT_FAILURE ); // tell gcc not to go any further
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| 66 | } // main
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| 67 |
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| 68 | // Local Variables: //
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| 69 | // tab-width: 4 //
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| 70 | // mode: c++ //
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| 71 | // compile-command: "g++ -Wall -Wextra as.c -o as" //
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| 72 | // End: //
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