Factor out minsym_found/find_function_start_sal overload

I need to make the ifunc resolving code in elfread.c skip the target
function's prologue like minsym_found does.  I thought of factoring
that out to a separate function, but turns out there's already a
comment in find_function_start_sal that says that should agree with
minsym_found...

Instead of making sure the code agrees with a comment, factor out the
common code to a separate function and use it from both places.

Note that the current find_function_start_sal does a bit more than
minsym_found's equivalent (the "We always should ..." bit), though
that's probably a latent bug.

gdb/ChangeLog:
2018-04-26  Pedro Alves  <palves@redhat.com>

	* linespec.c (minsym_found): Use find_function_start_sal CORE_ADDR
	overload.
	* symtab.c (find_function_start_sal(CORE_ADDR, obj_section *,bool)):
	New, factored out from ...
	(find_function_start_sal(symbol *, int)): ... this.  Reimplement
	and use bool.
	* symtab.h (find_function_start_sal(CORE_ADDR, obj_section *,bool)):
	New.
	(find_function_start_sal(symbol *, int)): Change boolean parameter
	type to bool.

1 files changed, 11 insertions, 2 deletions

diff --git a/gdb/symtab.h b/gdb/symtab.h
index a89d5978a37..0bd95fae9fd 100644
--- a/gdb/symtab.h
+++ b/gdb/symtab.h
@@ -1899,8 +1899,17 @@ int matching_obj_sections (struct obj_section *, struct obj_section *);
 
 extern struct symtab *find_line_symtab (struct symtab *, int, int *, int *);
 
-extern struct symtab_and_line find_function_start_sal (struct symbol *sym,
-						       int);
+/* Given a function symbol SYM, find the symtab and line for the start
+   of the function.  If FUNFIRSTLINE is true, we want the first line
+   of real code inside the function.  */
+extern symtab_and_line find_function_start_sal (symbol *sym, bool
+						funfirstline);
+
+/* Same, but start with a function address/section instead of a
+   symbol.  */
+extern symtab_and_line find_function_start_sal (CORE_ADDR func_addr,
+						obj_section *section,
+						bool funfirstline);
 
 extern void skip_prologue_sal (struct symtab_and_line *);