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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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23
src/core/init.c
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@@ -25,18 +25,6 @@
*
*/
/** Registered initialisation functions */
static struct init_fn init_fns[0]
__table_start ( struct init_fn, init_fns );
static struct init_fn init_fns_end[0]
__table_end ( struct init_fn, init_fns );
/** Registered startup/shutdown functions */
static struct startup_fn startup_fns[0]
__table_start ( struct startup_fn, startup_fns );
static struct startup_fn startup_fns_end[0]
__table_end ( struct startup_fn, startup_fns );
/** "startup() has been called" flag */
static int started = 0;
@@ -54,9 +42,8 @@ void initialise ( void ) {
struct init_fn *init_fn;
/* Call registered initialisation functions */
for ( init_fn = init_fns ; init_fn < init_fns_end ; init_fn++ ) {
for_each_table_entry ( init_fn, INIT_FNS )
init_fn->initialise ();
}
}
/**
@@ -73,8 +60,7 @@ void startup ( void ) {
return;
/* Call registered startup functions */
for ( startup_fn = startup_fns ; startup_fn < startup_fns_end ;
startup_fn++ ) {
for_each_table_entry ( startup_fn, STARTUP_FNS ) {
if ( startup_fn->startup )
startup_fn->startup();
}
@@ -90,7 +76,7 @@ void startup ( void ) {
* This function reverses the actions of startup(), and leaves gPXE in
* a state ready to be removed from memory. You may call startup()
* again after calling shutdown().
*
* Call this function only once, before either exiting main() or
* starting up a non-returnable image.
*/
@@ -101,8 +87,7 @@ void shutdown ( int flags ) {
return;
/* Call registered shutdown functions (in reverse order) */
for ( startup_fn = startup_fns_end - 1 ; startup_fn >= startup_fns ;
startup_fn-- ) {
for_each_table_entry_reverse ( startup_fn, STARTUP_FNS ) {
if ( startup_fn->shutdown )
startup_fn->shutdown ( flags );
}