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Handle alignof and _Alignof

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This adds alignof and _Alignof to the C/C++ expression parser, and
adds new tests to test the features.  The tests are written to try to
ensure that gdb's knowledge of alignment rules stays in sync with the
compiler's.

2018-04-30  Tom Tromey  <tom@tromey.com>

	PR exp/17095:
	* NEWS: Update.
	* std-operator.def (UNOP_ALIGNOF): New operator.
	* expprint.c (dump_subexp_body_standard) <case UNOP_ALIGNOF>:
	New.
	* eval.c (evaluate_subexp_standard) <case UNOP_ALIGNOF>: New.
	* c-lang.c (c_op_print_tab): Add alignof.
	* c-exp.y (ALIGNOF): New token.
	(exp): Add "ALIGNOF" production.
	(ident_tokens): Add _Alignof and alignof.

2018-04-30  Tom Tromey  <tom@tromey.com>

	PR exp/17095:
	* gdb.dwarf2/dw2-align.exp: New file.
	* gdb.cp/align.exp: New file.
	* gdb.base/align.exp: New file.
	* lib/gdb.exp (gdb_int128_helper): New proc.
	(has_int128_c, has_int128_cxx): New caching procs.
This commit is contained in:
Tom Tromey
2018-04-20 13:40:29 -06:00
parent 2b4424c35b
commit 007e153034
12 changed files with 444 additions and 1 deletions
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1
gdb/c-lang.c
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@ -751,6 +751,7 @@ const struct op_print c_op_print_tab[] =
{"*", UNOP_IND, PREC_PREFIX, 0},
{"&", UNOP_ADDR, PREC_PREFIX, 0},
{"sizeof ", UNOP_SIZEOF, PREC_PREFIX, 0},
{"alignof ", UNOP_ALIGNOF, PREC_PREFIX, 0},
{"++", UNOP_PREINCREMENT, PREC_PREFIX, 0},
{"--", UNOP_PREDECREMENT, PREC_PREFIX, 0},
{NULL, OP_NULL, PREC_PREFIX, 0}