Changeset f7ac09d for src/driver/as.cc

Timestamp:

Aug 2, 2018, 5:51:59 PM (6 years ago)

Author:

Peter A. Buhr <pabuhr@…>

Branches:

ADT, aaron-thesis, arm-eh, ast-experimental, cleanup-dtors, deferred_resn, demangler, enum, forall-pointer-decay, jacob/cs343-translation, jenkins-sandbox, master, new-ast, new-ast-unique-expr, no_list, persistent-indexer, pthread-emulation, qualifiedEnum

Children:

3537dd7

Parents:

0a76d84

Message:

third version of add CFA language

File:

• src/driver/as.cc (modified) (2 diffs)

src/driver/as.cc

@@ -10 +10 @@
 // Created On       : Wed Aug  1 10:49:42 2018
 // Last Modified By : Peter A. Buhr
-// Last Modified On : Thu Aug  2 16:18:14 2018
-// Update Count     : 84
+// Last Modified On : Thu Aug  2 17:50:09 2018
+// Update Count     : 90
 // 
 
@@ -38 +38 @@
         off_t size = mystat.st_size;
 
-        if ( ftruncate( fd, size + 1 ) ) { perror( "ftruncate" ); exit( EXIT_FAILURE ); };
-
         char * start = (char *)mmap( NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0 );
         if ( start == (void *)-1 ) { perror( "mmap" ); exit( EXIT_FAILURE ); };
 
-        char * cursor = strstr( start, ".Ldebug_info0:" );      // debug information ?
-        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 text 1 character right
-        *(cursor) = '2';                                                                        // replace with CFA language value
-        *(cursor + 1) = '5';
+        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 ); };
 
-        if ( munmap( start, size ) ) { perror( "munmap" ); 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";