From 173981bc49c9e8fce9271cb47714952dbe2ec627 Mon Sep 17 00:00:00 2001 From: Pedro Alves Date: Tue, 12 Apr 2016 17:20:04 +0100 Subject: Use setjmp/longjmp for TRY/CATCH instead of sigsetjmp/siglongjmp Now that we don't ever throw GDB exceptions from signal handlers [1], we can switch to have TRY/CATCH implemented in terms of plain setjmp/longjmp instead of sigsetjmp/siglongjmp. In https://sourceware.org/ml/gdb-patches/2015-02/msg00114.html, Yichun Zhang mentions a 11%/14%+ speedup in his GDB python scripts with a patch that did something similar to only a specific set of TRY/CATCH calls. [1] - https://sourceware.org/ml/gdb-patches/2016-03/msg00351.html Tested on x86_64 Fedora 23, native and gdbserver. gdb/ChangeLog: 2016-04-12 Pedro Alves * common/common-exceptions.c (struct catcher) : Now a 'jmp_buf' instead of SIGJMP_BUF. (exceptions_state_mc_init): Change return type to 'jmp_buf'. (throw_exception): Use longjmp instead of SIGLONGJMP. * common/common-exceptions.h: Include instead of "gdb_setjmp.h". (exceptions_state_mc_init): Change return type to 'jmp_buf'. [GDB_XCPT == GDB_XCPT_SJMP] (TRY): Use setjmp instead of SIGSETJMP. * cp-support.c: Include "gdb_setjmp.h". --- gdb/common/common-exceptions.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'gdb/common/common-exceptions.c') diff --git a/gdb/common/common-exceptions.c b/gdb/common/common-exceptions.c index 5ea81880169..2e638620b85 100644 --- a/gdb/common/common-exceptions.c +++ b/gdb/common/common-exceptions.c @@ -46,7 +46,7 @@ struct catcher { enum catcher_state state; /* Jump buffer pointing back at the exception handler. */ - SIGJMP_BUF buf; + jmp_buf buf; /* Status buffer belonging to the exception handler. */ struct gdb_exception exception; struct cleanup *saved_cleanup_chain; @@ -73,7 +73,7 @@ catcher_list_size (void) return size; } -SIGJMP_BUF * +jmp_buf * exceptions_state_mc_init (void) { struct catcher *new_catcher = XCNEW (struct catcher); @@ -275,7 +275,7 @@ throw_exception (struct gdb_exception exception) be zero, by definition in defs.h. */ exceptions_state_mc (CATCH_THROWING); current_catcher->exception = exception; - SIGLONGJMP (current_catcher->buf, exception.reason); + longjmp (current_catcher->buf, exception.reason); #else if (exception.reason == RETURN_QUIT) { -- cgit v1.2.1