Index: driver/as.cc
===================================================================
--- driver/as.cc	(revision fc846ae1acddff210b81091b8b89c32961a0002c)
+++ driver/as.cc	(revision fc846ae1acddff210b81091b8b89c32961a0002c)
@@ -0,0 +1,72 @@
+// 
+// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
+//
+// The contents of this file are covered under the licence agreement in the
+// file "LICENCE" distributed with Cforall.
+// 
+// as.c -- 
+// 
+// Author           : Peter A. Buhr
+// Created On       : Wed Aug  1 10:49:42 2018
+// Last Modified By : Peter A. Buhr
+// Last Modified On : Thu Aug  2 17:50:09 2018
+// Update Count     : 90
+// 
+
+#include <cstdio>										// perror
+#include <cstdlib>										// exit
+#include <fcntl.h>										// open
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/mman.h>									// mmap
+#include <string.h>
+
+//#define __DEBUG_H__
+
+int main( const int argc, const char * argv[] ) {
+	#ifdef __DEBUG_H__
+	for ( int i = 0; i < argc; i += 1 ) {
+		cerr << argv[i] << endl;
+	} // for
+	#endif // __DEBUG_H__
+
+	int fd = open( argv[argc - 1], O_RDWR );
+	if ( fd < 0 ) { perror( "open" ); exit( EXIT_FAILURE ); };
+
+	struct stat mystat = {};
+	if ( fstat( fd, &mystat ) ) { perror( "fstat" ); exit( EXIT_FAILURE ); };
+	off_t size = mystat.st_size;
+
+	char * start = (char *)mmap( NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0 );
+	if ( start == (void *)-1 ) { perror( "mmap" ); exit( EXIT_FAILURE ); };
+
+	if ( char * cursor = strstr( start, ".Ldebug_info0:" ) ) { // debug information ?
+		// Expand file by one byte to hold 2 character Cforall language code.
+		if ( ftruncate( fd, size + 1 ) ) { perror( "ftruncate" ); exit( EXIT_FAILURE ); };
+
+		for ( int i = 0; i < 8; i += 1 ) {				// move N (magic) lines forward
+			cursor = strstr( cursor, "\n" ) + 1;
+		} // for
+
+		cursor -= 2;									// backup over "c\n" language value
+		if ( *(cursor - 1) != 'x' ) { fprintf( stderr, "invalid C language code\n" ); exit( EXIT_FAILURE ); };
+
+		memmove( cursor + 2, cursor + 1, start + size - cursor - 1 ); // move remaining text 1 character right
+
+		*(cursor) = '2';								// replace C language value with CFA
+		*(cursor + 1) = '5';
+	} // if
+
+	if ( munmap( start, size ) ) { perror( "munmap" ); exit( EXIT_FAILURE ); }; // update on disk
+
+	argv[0] = "as";
+	execvp( argv[0], (char * const *)argv );			// should not return
+	perror( "CFA Translator error: cpp level, execvp" );
+	exit( EXIT_FAILURE );								// tell gcc not to go any further
+} // main
+
+// Local Variables: //
+// tab-width: 4 //
+// mode: c++ //
+// compile-command: "g++ -Wall -Wextra as.c -o as" //
+// End: //