listing: add -L option for additional listing info

Add an -L option for additional listing information. Currently
supported is -Le, which emits each line after processing through the
preprocessor, and -Lm, which displays each single-line macro defined
or undefined.

NASM doesn't preserve the names of unused arguments, nor does it have
any technical reason to do so. Instead of adding complexity to save
them, make unnamed parameters official by specifying an empty string
in the argument list.

This has the additional advantage that () is now simply considered a
single empty argument, which means that NASM should now properly
handle things like:

%define myreg() eax
	mov edx,myreg()

... similar to how the C preprocessor allows an empty macro argument
list which is distinct from a macro with no arguments whatsoever.

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/asm/listing.h b/asm/listing.h
index dac18bfe..00326854 100644
--- a/asm/listing.h
+++ b/asm/listing.h
@@ -1,6 +1,6 @@
 /* ----------------------------------------------------------------------- *
  *   
- *   Copyright 1996-2016 The NASM Authors - All Rights Reserved
+ *   Copyright 1996-2019 The NASM Authors - All Rights Reserved
  *   See the file AUTHORS included with the NASM distribution for
  *   the specific copyright holders.
  *
@@ -110,5 +110,14 @@ struct lfmt {
 
 extern const struct lfmt *lfmt;
 extern bool user_nolist;
+extern uint64_t active_list_options;   /* Simply a bitmask of ASCII-64 */
+
+static inline bool list_option(char x)
+{
+    unsigned int p = x - '@';
+    if (p > 63)
+        return false;
+    return unlikely(active_list_options & (UINT64_C(1) << p));
+}
 
 #endif