mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 00:31:08 +00:00
119 lines
3.3 KiB
Awk
119 lines
3.3 KiB
Awk
# Script to generate constants for Python pretty printers.
|
|
#
|
|
# Copyright (C) 2016-2017 Free Software Foundation, Inc.
|
|
# This file is part of the GNU C Library.
|
|
#
|
|
# The GNU C Library is free software; you can redistribute it and/or
|
|
# modify it under the terms of the GNU Lesser General Public
|
|
# License as published by the Free Software Foundation; either
|
|
# version 2.1 of the License, or (at your option) any later version.
|
|
#
|
|
# The GNU C Library is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
# Lesser General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU Lesser General Public
|
|
# License along with the GNU C Library; if not, see
|
|
# <http://www.gnu.org/licenses/>.
|
|
|
|
# This script is a smaller version of the clever gen-asm-const.awk hack used to
|
|
# generate ASM constants from .sym files. We'll use this to generate constants
|
|
# for Python pretty printers.
|
|
#
|
|
# The input to this script are .pysym files that look like:
|
|
# #C_Preprocessor_Directive...
|
|
# NAME1
|
|
# NAME2 expression...
|
|
#
|
|
# A line giving just a name implies an expression consisting of just that name.
|
|
# Comments start with '--'.
|
|
#
|
|
# The output of this script is a 'dummy' function containing 'asm' declarations
|
|
# for each non-preprocessor line in the .pysym file. The expression values
|
|
# will appear as input operands to the 'asm' declaration. For example, if we
|
|
# have:
|
|
#
|
|
# /* header.h */
|
|
# #define MACRO 42
|
|
#
|
|
# struct S {
|
|
# char c1;
|
|
# char c2;
|
|
# char c3;
|
|
# };
|
|
#
|
|
# enum E {
|
|
# ZERO,
|
|
# ONE
|
|
# };
|
|
#
|
|
# /* symbols.pysym */
|
|
# #include <stddef.h>
|
|
# #include "header.h"
|
|
# -- This is a comment
|
|
# MACRO
|
|
# C3_OFFSET offsetof(struct S, c3)
|
|
# E_ONE ONE
|
|
#
|
|
# the output will be:
|
|
#
|
|
# #include <stddef.h>
|
|
# #include "header.h"
|
|
# void dummy(void)
|
|
# {
|
|
# asm ("@name@MACRO@value@%0@" : : "i" (MACRO));
|
|
# asm ("@name@C3_OFFSET@value@%0@" : : "i" (offsetof(struct S, c3)));
|
|
# asm ("@name@E_ONE@value@%0@" : : "i" (ONE));
|
|
# }
|
|
#
|
|
# We'll later feed this output to gcc -S. Since '-S' tells gcc to compile but
|
|
# not assemble, gcc will output something like:
|
|
#
|
|
# dummy:
|
|
# ...
|
|
# @name@MACRO@value@$42@
|
|
# @name@C3_OFFSET@value@$2@
|
|
# @name@E_ONE@value@$1@
|
|
#
|
|
# Finally, we can process that output to extract the constant values.
|
|
# Notice gcc may prepend a special character such as '$' to each value.
|
|
|
|
# found_symbol indicates whether we found a non-comment, non-preprocessor line.
|
|
BEGIN { found_symbol = 0 }
|
|
|
|
# C preprocessor directives go straight through.
|
|
/^#/ { print; next; }
|
|
|
|
# Skip comments.
|
|
/--/ { next; }
|
|
|
|
# Trim leading whitespace.
|
|
{ sub(/^[[:blank:]]*/, ""); }
|
|
|
|
# If we found a non-comment, non-preprocessor line, print the 'dummy' function
|
|
# header.
|
|
NF > 0 && !found_symbol {
|
|
print "void dummy(void)\n{";
|
|
found_symbol = 1;
|
|
}
|
|
|
|
# If the line contains just a name, duplicate it so we can use that name
|
|
# as the value of the expression.
|
|
NF == 1 { sub(/^.*$/, "& &"); }
|
|
|
|
# If a line contains a name and an expression...
|
|
NF > 1 {
|
|
name = $1;
|
|
|
|
# Remove any characters before the second field.
|
|
sub(/^[^[:blank:]]+[[:blank:]]+/, "");
|
|
|
|
# '$0' ends up being everything that appeared after the first field
|
|
# separator.
|
|
printf " asm (\"@name@%s@value@%0@\" : : \"i\" (%s));\n", name, $0;
|
|
}
|
|
|
|
# Close the 'dummy' function.
|
|
END { if (found_symbol) print "}"; }
|