Change file initialization to use INIT_GDB_FILE macro

This patch introduces a new macro, INIT_GDB_FILE.  This is used to
replace the current "_initialize_" idiom when introducing a per-file
initialization function.  That is, rather than write:

    void _initialize_something ();
    void
    _initialize_something ()
    {
       ...
    }

... now you would write:

    INIT_GDB_FILE (something)
    {
       ...
    }

The macro handles both the declaration and definition of the function.

The point of this approach is that it makes it harder to accidentally
cause an initializer to be omitted; see commit 2711e475 ("Ensure
cooked_index_entry self-tests are run").  Specifically, the regexp now
used by make-init-c seems harder to trick.

New in v2: un-did some erroneous changes made by the script.

The bulk of this patch was written by script.
Regression tested on x86-64 Fedora 41.

1 files changed, 14 insertions, 11 deletions

diff --git a/gdb/make-init-c b/gdb/make-init-c
index 5ea6df5..6834b43 100755
--- a/gdb/make-init-c
+++ b/gdb/make-init-c
@@ -25,12 +25,13 @@
 #
 # Where SOURCE-FILES is the list of source files to extract init functions from.
 #
-# Formatting conventions:  The name of the initialization routines must begin
-# with `_initialize_`, must start in column zero, and be followed with exactly
-# ` ()`.  For example:
+
+# An initialization function is introduced using the "INIT_GDB_FILE"
+# macro.  In ordinary code this expands to a function declaration (to
+# avoid a warning) and then the start of a definition.  In the
+# generated init.c, though, it is expanded differently.  For example:
 #
-# void
-# _initialize_foo ()
+# INIT_GDB_FILE (foo)
 # {
 #   ...
 # }
@@ -43,19 +44,21 @@ echo "/* Do not modify this file.  */"
 echo "/* It is created automatically by the Makefile.  */"
 echo "#include <algorithm>"
 echo ""
-sed -n -e 's/^\(void \|\)\(_initialize_[a-zA-Z0-9_]*\) ()$/\2/p' "$@" | while read -r name; do
-  echo "extern initialize_file_ftype $name;"
-done
+echo "#undef INIT_GDB_FILE"
+echo "#define INIT_GDB_FILE(NAME) extern void _initialize_ ## NAME ();"
+grep -h '^[ 	]*INIT_GDB_FILE\b' "$@"
 echo ""
 echo "void initialize_all_files ();"
 echo "void"
 echo "initialize_all_files ()"
 echo "{"
+echo "  typedef void initialize_file_ftype (void);"
+echo ""
 echo "  std::vector<initialize_file_ftype *> functions ="
 echo "    {"
-sed -n -e 's/^\(void \|\)\(_initialize_[a-zA-Z0-9_]*\) ()$/\2/p' "$@" | while read -r name; do
-  echo "      $name,"
-done
+echo "#undef INIT_GDB_FILE"
+echo "#define INIT_GDB_FILE(NAME) _initialize_ ## NAME,"
+grep -h '^[ 	]*INIT_GDB_FILE\b' "$@"
 echo "    };"
 echo ""
 echo "  /* If GDB_REVERSE_INIT_FUNCTIONS is set (any value), reverse the"