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Partial backport of:
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commit cb7be1590e9b18e272e72eb4e910a7ad06a53bd0
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Author: Joseph Myers <joseph@codesourcery.com>
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Date: Mon Dec 10 22:56:59 2018 +0000
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Use gen-as-const.py to process .pysym files.
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This patch eliminates the gen-py-const.awk variant of gen-as-const,
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switching to use of gnu-as-const.py (with a new --python option) to
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process .pysym files (i.e., to generate nptl_lock_constants.py), as
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the syntax of those files is identical to that of .sym files.
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Note that the generated nptl_lock_constants.py is *not* identical to
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the version generated by the awk script. Apart from the trivial
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changes (comment referencing the new script, and output being sorted),
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the constant FUTEX_WAITERS, PTHREAD_MUTEXATTR_FLAG_BITS,
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PTHREAD_MUTEXATTR_FLAG_PSHARED and PTHREAD_MUTEX_PRIO_CEILING_MASK are
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now output as positive rather than negative constants (on x86_64
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anyway; maybe not necessarily on 32-bit systems):
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< FUTEX_WAITERS = -2147483648
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---
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> FUTEX_WAITERS = 2147483648
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< PTHREAD_MUTEXATTR_FLAG_BITS = -251662336
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< PTHREAD_MUTEXATTR_FLAG_PSHARED = -2147483648
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---
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> PTHREAD_MUTEXATTR_FLAG_BITS = 4043304960
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> PTHREAD_MUTEXATTR_FLAG_PSHARED = 2147483648
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< PTHREAD_MUTEX_PRIO_CEILING_MASK = -524288
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---
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> PTHREAD_MUTEX_PRIO_CEILING_MASK = 4294443008
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This is because gen-as-const has a cast of the constant value to long
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int, which gen-py-const lacks.
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I think the positive values are more logically correct, since the
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constants in question are in fact unsigned in C. But to reliably
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produce gen-as-const.py output for constants that always (in C and
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Python) reflects the signedness of values with the high bit of "long
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int" set would mean more complicated logic needs to be used in
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computing values.
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The more correct positive values by themselves produce a failure of
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nptl/test-mutexattr-printers, because masking with
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~PTHREAD_MUTEXATTR_FLAG_BITS & ~PTHREAD_MUTEX_NO_ELISION_NP now leaves
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a bit -1 << 32 in the Python value, resulting in a KeyError exception.
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To avoid that, places masking with ~ of one of the constants in
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question are changed to mask with 0xffffffff as well (this reflects
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how ~ in Python applies to an infinite-precision integer whereas ~ in
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C does not do any promotions beyond the width of int).
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Tested for x86_64.
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* scripts/gen-as-const.py (main): Handle --python option.
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* scripts/gen-py-const.awk: Remove.
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* Makerules (py-const-script): Use gen-as-const.py.
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($(py-const)): Likewise.
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* nptl/nptl-printers.py (MutexPrinter.read_status_no_robust): Mask
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with 0xffffffff together with ~(PTHREAD_MUTEX_PRIO_CEILING_MASK).
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(MutexAttributesPrinter.read_values): Mask with 0xffffffff
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together with ~PTHREAD_MUTEXATTR_FLAG_BITS and
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~PTHREAD_MUTEX_NO_ELISION_NP.
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* manual/README.pretty-printers: Update reference to
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gen-py-const.awk.
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Only the gen-as-const.py changes are included downstream. We keep using
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gen-py-const.awk for the build.
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diff --git a/scripts/gen-as-const.py b/scripts/gen-as-const.py
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index f85e359394acb1a4..2f1dff092b98e044 100644
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--- a/scripts/gen-as-const.py
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+++ b/scripts/gen-as-const.py
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@@ -75,6 +75,8 @@ def main():
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help='C compiler (including options) to use')
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parser.add_argument('--test', action='store_true',
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help='Generate test case instead of header')
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+ parser.add_argument('--python', action='store_true',
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+ help='Generate Python file instead of header')
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parser.add_argument('sym_file',
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help='.sym file to process')
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args = parser.parse_args()
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@@ -103,6 +105,13 @@ def main():
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sym_data.append('START')
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if args.test:
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print(gen_test(sym_data))
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+ elif args.python:
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+ consts = glibcextract.compute_c_consts(sym_data, args.cc)
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+ print('# GENERATED FILE\n'
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+ '\n'
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+ '# Constant definitions.\n'
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+ '# See gen-as-const.py for details.\n')
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+ print(''.join('%s = %s\n' % c for c in sorted(consts.items())), end='')
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else:
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consts = glibcextract.compute_c_consts(sym_data, args.cc)
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print(''.join('#define %s %s\n' % c for c in sorted(consts.items())), end='')
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