Expand preprocessor macros in C expressions.

* c-lang.h: #include "macroexp.h", for macro_lookup_ftype.
(scan_macro_expansion, scanning_macro_expansion,
finished_macro_expansion): New function declarations.
(expression_macro_lookup_func, expression_macro_lookup_baton): New
variable declarations.
* parser-defs.h (expression_context_pc): New declaration.
* parse.c (expression_context_pc): New variable.
(parse_exp_1): Set expression_context_pc, as well as
expression_context_block.
* c-exp.y (yylex): If we're not already reading the result of a
macro expansion, try to macro-expand the next token.  When we're
done scanning a macro expansion, switch back to the mainline text.
Commas and `if's in a macro's expansion don't terminate the input.
* c-lang.c: #include "macroscope.h" and "gdb_assert.h".
(macro_original_text, macro_expanded_text,
expression_macro_lookup_func, expression_macro_lookup_baton): New
variables.
(scan_macro_expansion, scanning_macro_expansion,
finished_macro_expansion, scan_macro_cleanup, null_macro_lookup,
c_preprocess_and_parse): New functions.
(c_language_defn, cplus_language_defn, asm_language_defn): Call
c_preprocess_and_parse, instead of c_parse.
* Makefile.in (c_lang_h): Note that this #includes macroexp.h.
(c-lang.o): Note dependency on macroscope.h and gdb_assert.h.

1 files changed, 8 insertions, 0 deletions

diff --git a/gdb/c-lang.h b/gdb/c-lang.h
index b1925e1e2d6..e64d4c69e90 100644
--- a/gdb/c-lang.h
+++ b/gdb/c-lang.h
@@ -24,6 +24,7 @@
 #define C_LANG_H 1
 
 #include "value.h"
+#include "macroexp.h"
 
 
 extern int c_parse (void);	/* Defined in c-exp.y */
@@ -49,6 +50,13 @@ extern void c_printstr (struct ui_file * stream, char *string,
 			unsigned int length, int width,
 			int force_ellipses);
 
+extern void scan_macro_expansion (char *expansion);
+extern int scanning_macro_expansion (void);
+extern void finished_macro_expansion (void);
+
+extern macro_lookup_ftype *expression_macro_lookup_func;
+extern void *expression_macro_lookup_baton;
+
 extern struct type *c_create_fundamental_type (struct objfile *, int);
 
 extern struct type **const (c_builtin_types[]);