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[tables] Redefine methods for accessing linker tables

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Intel's C compiler (icc) chokes on the zero-length arrays that we
currently use as part of the mechanism for accessing linker table
entries.  Abstract away the zero-length arrays, to make a port to icc
easier.

Introduce macros such as for_each_table_entry() to simplify the common
case of iterating over all entries in a linker table.

Represent table names as #defined string constants rather than
unquoted literals; this avoids visual confusion between table names
and C variable or type names, and also allows us to force a
compilation error in the event of incorrect table names.
This commit is contained in:
Michael Brown
2009-03-12 19:41:40 +00:00
parent 3ed468e0c5
commit 1266d7902b
48 changed files with 239 additions and 264 deletions
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7
src/core/exec.c
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@@ -34,11 +34,6 @@
*
*/
static struct command commands[0]
__table_start ( struct command, commands );
static struct command commands_end[0]
__table_end ( struct command, commands );
/* Avoid dragging in getopt.o unless a command really uses it */
int optind;
int nextchar;
@@ -78,7 +73,7 @@ int execv ( const char *command, char * const argv[] ) {
reset_getopt();
/* Hand off to command implementation */
for ( cmd = commands ; cmd < commands_end ; cmd++ ) {
for_each_table_entry ( cmd, COMMANDS ) {
if ( strcmp ( command, cmd->name ) == 0 )
return cmd->exec ( argc, ( char ** ) argv );
}