| 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 -- map assembler file, scan for debug information, then language code, and skip N lines forward to code. If
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| 8 | // code is C dialect, possibly expand file by one character, and replace with Cforall language code.
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| 9 | //
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| 10 | // Author : Peter A. Buhr
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| 11 | // Created On : Wed Aug 1 10:49:42 2018
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| 12 | // Last Modified By : Peter A. Buhr
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| 13 | // Last Modified On : Wed Dec 8 07:56:12 2021
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| 14 | // Update Count : 136
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| 15 | //
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| 16 |
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| 17 | #include <cstdio> // perror
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| 18 | #include <cstdlib> // exit
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| 19 | #include <fcntl.h> // open
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| 20 | #include <cstring> // strstr, memmove
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| 21 | #include <unistd.h> // ftruncate,execvp
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| 22 | #include <sys/stat.h> // fstat
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| 23 | #include <sys/mman.h> // mmap
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| 24 |
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| 25 | //#define __DEBUG_H__
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| 26 |
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| 27 | int main( const int argc, const char * argv[] ) {
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| 28 | #ifdef __DEBUG_H__
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| 29 | for ( int i = 0; i < argc; i += 1 ) {
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| 30 | fprintf( stderr, "%s\n", argv[i] );
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| 31 | } // for
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| 32 | #endif // __DEBUG_H__
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| 33 |
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| 34 | int fd = open( argv[argc - 1], O_RDWR );
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| 35 | if ( fd < 0 ) { perror( "open" ); exit( EXIT_FAILURE ); };
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| 36 |
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| 37 | struct stat mystat = {};
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| 38 | if ( fstat( fd, &mystat ) ) { perror( "fstat" ); exit( EXIT_FAILURE ); };
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| 39 | off_t size = mystat.st_size;
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| 40 |
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| 41 | if ( size ) { // cannot map 0 sized file
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| 42 | char * start = (char *)mmap( NULL, size + 2, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0 );
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| 43 | if ( start == (void *)-1 ) { perror( "mmap" ); exit( EXIT_FAILURE ); };
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| 44 |
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| 45 | char * dcursor;
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| 46 | if ( (dcursor = strstr( start, ".Ldebug_info0:" ) ) ) { // debug information ?
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| 47 |
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| 48 | if ( char * cursor = strstr( dcursor, ".long\t.LASF" ) ) { // language code ?
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| 49 | for ( int i = 0; i < 2; i += 1 ) { // move N (magic) lines forward
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| 50 | cursor = strstr( cursor, "\n" ) + 1;
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| 51 | } // for
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| 52 | cursor -= 2; // backup over "d\n", where d is a hex digit
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| 53 | // From elfcpp/dwarf.h in the binutils source tree.
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| 54 | // DW_LANG_C89 = 0x1, DW_LANG_C = 0x2, DW_LANG_C99 = 0xc, DW_LANG_C11 = 0x1d
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| 55 | if ( *(cursor - 2) == '0' && *(cursor - 1) == 'x' &&
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| 56 | (*cursor == 'c' || *cursor == '1' || *cursor == '2') ) { // C99/C89/C
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| 57 | // Expand file by one byte to hold 2 character Cforall language code.
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| 58 | if ( ftruncate( fd, size + 1 ) ) { perror( "ftruncate" ); exit( EXIT_FAILURE ); };
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| 59 | memmove( cursor + 2, cursor + 1, start + size - cursor - 1 ); // move remaining text 1 character right
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| 60 | } else if ( *(cursor - 3) == '0' && *(cursor - 2) == 'x' && *(cursor - 1) == '1' && *cursor == 'd' ) { // C11
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| 61 | } else {
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| 62 | for ( int i = 0; i < 6; i += 1 ) { // move N (magic) lines forward
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| 63 | cursor = strstr( cursor, "\n" ) + 1;
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| 64 | } // for
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| 65 | fprintf( stderr, "*** ERROR *** Invalid C language code found in assembler file: %s\n"
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| 66 | "Assembler debug information:\n%.*s",
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| 67 | argv[argc - 1], (int)(cursor - dcursor), dcursor );
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| 68 | exit( EXIT_FAILURE );
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| 69 | } // if
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| 70 |
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| 71 | *(cursor - 1) = '2'; // replace C89/C/C99/C11 language code with CFA code
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| 72 | *cursor = '5';
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| 73 | } // if
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| 74 | } // if
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| 75 |
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| 76 | if ( munmap( start, size + 2 ) ) { perror( "munmap" ); exit( EXIT_FAILURE ); }; // update on disk
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| 77 | } // if
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| 78 |
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| 79 | argv[0] = "as";
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| 80 | execvp( argv[0], (char * const *)argv ); // should not return
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| 81 | perror( "CFA Translator error: cpp level, execvp" );
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| 82 | exit( EXIT_FAILURE ); // tell gcc not to go any further
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| 83 | } // main
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| 84 |
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| 85 | // Local Variables: //
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| 86 | // tab-width: 4 //
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| 87 | // mode: c++ //
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| 88 | // compile-command: "g++ -Wall -Wextra as.c -o as" //
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| 89 | // End: //
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