[tables] Redefine methods for accessing linker tables

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.

1 files changed, 8 insertions, 2 deletions

diff --git a/src/include/gpxe/efi/efi.h b/src/include/gpxe/efi/efi.h
index c7f63b6c7..c44e09cb1 100644
--- a/src/include/gpxe/efi/efi.h
+++ b/src/include/gpxe/efi/efi.h
@@ -54,9 +54,12 @@ struct efi_protocol {
 	void **protocol;
 };
 
+/** EFI protocol table */
+#define EFI_PROTOCOLS "efi_protocols"
+
 /** Declare an EFI protocol used by gPXE */
 #define __efi_protocol \
-	__table ( struct efi_protocol, efi_protocols, 01 )
+	__table ( struct efi_protocol, EFI_PROTOCOLS, 01 )
 
 /** Declare an EFI protocol to be required by gPXE
  *
@@ -86,9 +89,12 @@ struct efi_config_table {
 	int required;
 };
 
+/** EFI configuration table table */
+#define EFI_CONFIG_TABLES "efi_config_tables"
+
 /** Declare an EFI configuration table used by gPXE */
 #define __efi_config_table \
-	__table ( struct efi_config_table, efi_config_tables, 01 )
+	__table ( struct efi_config_table, EFI_CONFIG_TABLES, 01 )
 
 /** Declare an EFI configuration table to be used by gPXE
  *