sim: common: change gennltvals helper to Python

This tool is only run by developers and not in a release build,
so rewrite it in Python to make it more maintainable.

6 files changed, 243 insertions, 240 deletions

diff --git a/sim/ChangeLog b/sim/ChangeLog
index 5e1ebca..47aae1a 100644
--- a/sim/ChangeLog
+++ b/sim/ChangeLog
@@ -1,5 +1,9 @@
 2021-01-30  Mike Frysinger  <vapier@gentoo.org>
 
+	* Makefile.in (nltvals): Change to gennltvals.py.
+
+2021-01-30  Mike Frysinger  <vapier@gentoo.org>
+
 	* README-HACKING: Delete reference to sizeof_pc.
 
 2021-01-29  Mike Frysinger  <vapier@gentoo.org>
diff --git a/sim/Makefile.in b/sim/Makefile.in
index a35f807..1a2dbb1 100644
--- a/sim/Makefile.in
+++ b/sim/Makefile.in
@@ -232,7 +232,7 @@ config.status: configure
 # An alternative is to slurp in the tables at runtime.
 .PHONY: nltvals
 nltvals:
-	$(SHELL) $(abs_srcdir)/common/gennltvals.sh --cpp "$(CPP)" --output nltvals.def --srcroot $(srcroot) && \
+	$(abs_srcdir)/common/gennltvals.py --cpp "$(CPP)" --output nltvals.def --srcroot $(srcroot) && \
 	$(SHELL) $(srcroot)/move-if-change nltvals.def $(abs_srcdir)/common/nltvals.def
 
 # Utility to run autoconf in each directory that uses the common framework.
diff --git a/sim/common/ChangeLog b/sim/common/ChangeLog
index c7d6439..a00866d 100644
--- a/sim/common/ChangeLog
+++ b/sim/common/ChangeLog
@@ -1,5 +1,11 @@
 2021-01-30  Mike Frysinger  <vapier@gentoo.org>
 
+	* gennltvals.sh: Replace shell script with ...
+	* gennltvals.py: ... this Python script.
+	* nltvals.def: Regenerate.
+
+2021-01-30  Mike Frysinger  <vapier@gentoo.org>
+
 	* sim-watch.c (schedule_watchpoint): Change sizeof_pc to sizeof
 	sim_cia.
 	* sim-watch.h (struct _sim_watchpoints): Delete sizeof_pc.
diff --git a/sim/common/gennltvals.py b/sim/common/gennltvals.py
new file mode 100755
index 0000000..3ca510d
--- /dev/null
+++ b/sim/common/gennltvals.py
@@ -0,0 +1,230 @@
+#!/usr/bin/env python3
+# Copyright (C) 1996-2021 Free Software Foundation, Inc.
+#
+# This file is part of the GNU simulators.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Helper to generate nltvals.def.
+
+nltvals.def is a file that describes various newlib/libgloss target values used
+by the host/target interface.  This needs to be rerun whenever the newlib source
+changes.  Developers manually run it.
+
+If the path to newlib is not specified, it will be searched for in:
+- the root of this source tree
+- alongside this source tree
+"""
+
+import argparse
+from pathlib import Path
+import re
+import subprocess
+import sys
+from typing import Iterable, List, TextIO
+
+
+PROG = Path(__file__).name
+
+# Unfortunately, each newlib/libgloss port has seen fit to define their own
+# syscall.h file.  This means that system call numbers can vary for each port.
+# Support for all this crud is kept here, rather than trying to get too fancy.
+# If you want to try to improve this, please do, but don't break anything.
+# Note that there is a standard syscall.h file (libgloss/syscall.h) now which
+# hopefully more targets can use.
+#
+# NB: New ports should use libgloss, not newlib.
+TARGET_DIRS = {
+    'cr16': 'libgloss/cr16/sys',
+    'd10v': 'newlib/libc/sys/d10v/sys',
+    'i960': 'libgloss/i960',
+    'mcore': 'libgloss/mcore',
+    'v850': 'libgloss/v850/sys',
+}
+TARGETS = {
+    'bfin',
+    'cr16',
+    'd10v',
+    'fr30',
+    'frv',
+    'i960',
+    'lm32',
+    'm32r',
+    'mcore',
+    'mn10200',
+    'mn10300',
+    'msp430',
+    'pru',
+    'sparc',
+    'v850',
+}
+
+# Make sure TARGET_DIRS doesn't gain any typos.
+assert not set(TARGET_DIRS) - TARGETS
+
+# The header for the generated def file.
+FILE_HEADER = f"""\
+/* Newlib/libgloss macro values needed by remote target support.  */
+/* This file is machine generated by {PROG}.  */\
+"""
+
+
+def gentvals(output: TextIO, cpp: str, srctype: str, srcdir: Path,
+             headers: Iterable[str],
+             pattern: str,
+             target: str = None):
+    """Extract constants from the specified files using a regular expression.
+
+    We'll run things through the preprocessor.
+    """
+    headers = tuple(headers)
+
+    # Require all files exist in order to regenerate properly.
+    for header in headers:
+        fullpath = srcdir / header
+        assert fullpath.exists(), f'{fullpath} does not exist'
+
+    if target is None:
+        print(f'#ifdef {srctype}_defs', file=output)
+    else:
+        print(f'#ifdef NL_TARGET_{target}', file=output)
+        print(f'#ifdef {srctype}_defs', file=output)
+
+    print('\n'.join(f'/* from {x} */' for x in headers), file=output)
+
+    if target is None:
+        print(f'/* begin {srctype} target macros */', file=output)
+    else:
+        print(f'/* begin {target} {srctype} target macros */', file=output)
+
+    # Extract all the symbols.
+    srcfile = ''.join(f'#include <{x}>\n' for x in headers)
+    syms = set()
+    define_pattern = re.compile(r'^#\s*define\s+(' + pattern + ')')
+    for header in headers:
+        with open(srcdir / header, 'r', encoding='utf-8') as fp:
+            data = fp.read()
+        for line in data.splitlines():
+            m = define_pattern.match(line)
+            if m:
+                syms.add(m.group(1))
+    for sym in sorted(syms):
+        srcfile += f'#ifdef {sym}\nDEFVAL {{ "{sym}", {sym} }},\n#endif\n'
+
+    result = subprocess.run(
+        f'{cpp} -E -I"{srcdir}" -', shell=True, check=True, encoding='utf-8',
+        input=srcfile, capture_output=True)
+    for line in result.stdout.splitlines():
+        if line.startswith('DEFVAL '):
+            print(line[6:].rstrip(), file=output)
+
+    if target is None:
+        print(f'/* end {srctype} target macros */', file=output)
+        print('#endif', file=output)
+    else:
+        print(f'/* end {target} {srctype} target macros */', file=output)
+        print('#endif', file=output)
+        print('#endif', file=output)
+
+
+def gen_common(output: TextIO, newlib: Path, cpp: str):
+    """Generate the common C library constants.
+
+    No arch should override these.
+    """
+    gentvals(output, cpp, 'errno', newlib / 'newlib/libc/include',
+             ('errno.h', 'sys/errno.h'), 'E[A-Z0-9]*')
+
+    gentvals(output, cpp, 'signal', newlib / 'newlib/libc/include',
+             ('signal.h', 'sys/signal.h'), r'SIG[A-Z0-9]*')
+
+    gentvals(output, cpp, 'open', newlib / 'newlib/libc/include',
+             ('fcntl.h', 'sys/fcntl.h', 'sys/_default_fcntl.h'), r'O_[A-Z0-9]*')
+
+
+def gen_targets(output: TextIO, newlib: Path, cpp: str):
+    """Generate the target-specific lists."""
+    for target in sorted(TARGETS):
+        subdir = TARGET_DIRS.get(target, 'libgloss')
+        gentvals(output, cpp, 'sys', newlib / subdir, ('syscall.h',),
+                 r'SYS_[_a-zA-Z0-9]*', target=target)
+
+
+def gen(output: TextIO, newlib: Path, cpp: str):
+    """Generate all the things!"""
+    print(FILE_HEADER, file=output)
+    gen_common(output, newlib, cpp)
+    gen_targets(output, newlib, cpp)
+
+
+def get_parser() -> argparse.ArgumentParser:
+    """Get CLI parser."""
+    parser = argparse.ArgumentParser(
+        description=__doc__,
+        formatter_class=argparse.RawDescriptionHelpFormatter)
+    parser.add_argument(
+        '-o', '--output', type=Path,
+        help='write to the specified file instead of stdout')
+    parser.add_argument(
+        '--cpp', type=str, default='cpp',
+        help='the preprocessor to use')
+    parser.add_argument(
+        '--srcroot', type=Path,
+        help='the root of this source tree')
+    parser.add_argument(
+        'newlib', nargs='?', type=Path,
+        help='path to the newlib+libgloss source tree')
+    return parser
+
+
+def parse_args(argv: List[str]) -> argparse.Namespace:
+    """Process the command line & default options."""
+    parser = get_parser()
+    opts = parser.parse_args(argv)
+
+    if opts.srcroot is None:
+        opts.srcroot = Path(__file__).resolve().parent.parent.parent
+
+    if opts.newlib is None:
+        # Try to find newlib relative to our source tree.
+        if (opts.srcroot / 'newlib').is_dir():
+            # If newlib is manually in the same source tree, use it.
+            if (opts.srcroot / 'libgloss').is_dir():
+                opts.newlib = opts.srcroot
+            else:
+                opts.newlib = opts.srcroot / 'newlib'
+        elif (opts.srcroot.parent / 'newlib').is_dir():
+            # Or see if it's alongside the gdb/binutils repo.
+            opts.newlib = opts.srcroot.parent / 'newlib'
+    if opts.newlib is None or not opts.newlib.is_dir():
+        parser.error('unable to find newlib')
+
+    return opts
+
+
+def main(argv: List[str]) -> int:
+    """The main entry point for scripts."""
+    opts = parse_args(argv)
+
+    if opts.output is not None:
+        output = open(opts.output, 'w', encoding='utf-8')
+    else:
+        output = sys.stdout
+
+    gen(output, opts.newlib, opts.cpp)
+    return 0
+
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv[1:]))
diff --git a/sim/common/gennltvals.sh b/sim/common/gennltvals.sh
deleted file mode 100755
index 869cba2..0000000
--- a/sim/common/gennltvals.sh
+++ /dev/null
@@ -1,238 +0,0 @@
-#! /bin/sh
-# Copyright (C) 1996-2021 Free Software Foundation, Inc.
-#
-# This file is part of the GNU simulators.
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program 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 General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-# Display the tool usage and exit.
-usage() {
-  cat <<EOF
-Usage: $0 [path to newlib source tree]
-
-Generate nltvals.def, a file that describes various newlib/libgloss target
-values used by the host/target interface.  This needs to be rerun whenever
-the newlib source changes.  Developers manually run it.
-
-If the path to newlib is not specified, it will be searched for in:
-- the root of this source tree
-- alongside this source tree
-
-Options:
-  -o, --output <file>   Write to the specified file instead of stdout.
-  --cpp <cpp>           The preprocessor to use.
-  --srcroot <dir>       The root of this source tree.
-  -h, --help            This text you're reading!
-EOF
-  if [ $# -gt 0 ]; then
-    error "$*"
-  fi
-  exit 0
-}
-
-# Show an error message and exit.
-error() {
-  echo "$0: error: $*" >&2
-  exit 1
-}
-
-ARG_CPP="cpp"
-ARG_SRCROOT=""
-ARG_NEWLIB=""
-ARG_OUTPUT=""
-
-# Emit the header for this generated def file.
-gen_header() {
-  cat <<EOF
-/* Newlib/libgloss macro values needed by remote target support.  */
-/* This file is machine generated by gennltvals.sh.  */
-EOF
-}
-
-# Extract constants from the specified files using a regular expression and the
-# preprocessor.
-gentvals() {
-  target=$1
-  type=$2
-  dir=$3
-  # FIXME: Would be nice to process #include's in these files.
-  files=$4
-  pattern=$5
-
-  # Require all files exist in order to regenerate properly.
-  for f in ${files}; do
-    if [ ! -f "${dir}/${f}" ]; then
-      error "file does not exist: ${dir}/${f}"
-    fi
-  done
-
-  if [ -z "${target}" ]; then
-    echo "#ifdef ${type}_defs"
-  else
-    echo "#ifdef NL_TARGET_${target}"
-    echo "#ifdef ${type}_defs"
-  fi
-
-  printf "/* from %s */\n" ${files}
-
-  if [ -z "${target}" ]; then
-    echo "/* begin ${type} target macros */"
-  else
-    echo "/* begin ${target} ${type} target macros */"
-  fi
-
-  # Extract all the symbols.
-  (
-  printf '#include <%s>\n' ${files}
-  for f in ${files}; do
-    sed -E -n -e "/^# *define[[:space:]]${pattern}/{\
-        s|# *define[[:space:]](${pattern})[[:space:]]*([^[:space:]][^[:space:]]*).*$|\1|; \
-        p}" \
-      "${dir}/${f}"
-  done |
-  sort -u |
-  while read -r sym; do
-    echo "#ifdef ${sym}"
-    echo "DEFVAL { \"${sym}\", ${sym} },"
-    echo "#endif"
-  done
-  ) |
-  ${ARG_CPP} -E -I"${dir}" - |
-  sed -E -n -e '/^DEFVAL/{s/DEFVAL//; s/[[:space:]]+/ /; p}'
-
-  if [ -z "${target}" ]; then
-    echo "/* end ${type} target macros */"
-    echo "#endif"
-  else
-    echo "/* end ${target} ${type} target macros */"
-    echo "#endif"
-    echo "#endif"
-  fi
-}
-
-# Generate the common C library constants.  No arch should override these.
-gen_common() {
-  gentvals "" errno ${ARG_NEWLIB}/newlib/libc/include \
-    "errno.h sys/errno.h" 'E[[:upper:][:digit:]]*'
-
-  gentvals "" signal ${ARG_NEWLIB}/newlib/libc/include \
-    "signal.h sys/signal.h" 'SIG[[:upper:][:digit:]]*'
-
-  gentvals "" open ${ARG_NEWLIB}/newlib/libc/include \
-    "fcntl.h sys/fcntl.h sys/_default_fcntl.h" 'O_[[:upper:][:digit:]]*'
-}
-
-# Unfortunately, each newlib/libgloss port has seen fit to define their own
-# syscall.h file.  This means that system call numbers can vary for each port.
-# Support for all this crud is kept here, rather than trying to get too fancy.
-# If you want to try to improve this, please do, but don't break anything.
-# Note that there is a standard syscall.h file (libgloss/syscall.h) now which
-# hopefully more targets can use.
-#
-# NB: New ports should use libgloss, not newlib.
-gen_arch() {
-  target="$1"
-  dir="${2:-libgloss}"
-  gentvals "${target}" sys "${ARG_NEWLIB}/${dir}" "syscall.h" 'SYS_[_[:alnum:]]*'
-}
-
-gen_arches() {
-  gen_arch bfin
-  gen_arch cr16 libgloss/cr16/sys
-  gen_arch d10v newlib/libc/sys/d10v/sys
-  gen_arch fr30
-  gen_arch frv
-  gen_arch i960 libgloss/i960
-  gen_arch lm32
-  gen_arch m32r
-  gen_arch mcore libgloss/mcore
-  gen_arch mn10200
-  gen_arch mn10300
-  gen_arch msp430
-  gen_arch pru
-  gen_arch sparc
-  gen_arch v850 libgloss/v850/sys
-}
-
-# Process the script command line options.
-parse_opts() {
-  while [ $# -gt 0 ]; do
-    case $1 in
-      --cpp)
-        ARG_CPP="$2"
-        shift
-        ;;
-      -o|--output)
-        ARG_OUTPUT="$2"
-        shift
-        ;;
-      --srcroot)
-        ARG_SRCROOT="$2"
-        shift
-        ;;
-      -h|--help)
-        usage
-        ;;
-      --)
-        shift
-        break
-        ;;
-      -*)
-        usage "unknown option: $1"
-        ;;
-      *)
-        break
-        ;;
-    esac
-    shift
-  done
-
-  if [ $# -gt 2 ]; then
-    error "too many arguments: $*"
-  elif [ $# -eq 1 ]; then
-    ARG_NEWLIB="$1"
-  fi
-
-  # Try to find newlib relative to our source tree.
-  if [ -z "${ARG_NEWLIB}" ]; then
-    if [ -z "${ARG_SRCROOT}" ]; then
-      ARG_SRCROOT="$(dirname "$0")/../.."
-    fi
-    if [ -d "${ARG_SRCROOT}/newlib" ]; then
-      # If newlib is manually in the same source tree, use it.
-      ARG_NEWLIB="${ARG_SRCROOT}/newlib"
-    elif [ -d "${ARG_SRCROOT}/../newlib" ]; then
-      # Or see if it's alongside the gdb/binutils repo.
-      ARG_NEWLIB="${ARG_SRCROOT}/../newlib"
-    else
-      error "unable to find newlib"
-    fi
-  fi
-}
-
-main() {
-  # The error checking isn't perfect, but should be good enough for this script.
-  set -e
-
-  parse_opts "$@"
-
-  if [ -n "${ARG_OUTPUT}" ]; then
-    exec >"${ARG_OUTPUT}" || exit 1
-  fi
-
-  gen_header
-  gen_common
-  gen_arches
-}
-main "$@"
diff --git a/sim/common/nltvals.def b/sim/common/nltvals.def
index a196be2..4ab0564 100644
--- a/sim/common/nltvals.def
+++ b/sim/common/nltvals.def
@@ -1,5 +1,5 @@
 /* Newlib/libgloss macro values needed by remote target support.  */
-/* This file is machine generated by gennltvals.sh.  */
+/* This file is machine generated by gennltvals.py.  */
 #ifdef errno_defs
 /* from errno.h */
 /* from sys/errno.h */
@@ -604,6 +604,7 @@
  { "SYS_rename", 134 },
  { "SYS_stat", 38 },
  { "SYS_time", 23 },
+ { "SYS_times", 43 },
  { "SYS_unlink", 10 },
  { "SYS_utime", 201 },
  { "SYS_wait", 202 },