From 26003a205e207db7985c32ec1964a04652b68413 Mon Sep 17 00:00:00 2001 From: Tom Tromey Date: Mon, 28 Jan 2019 10:56:58 -0700 Subject: [PATCH] Make exception throwing a bit more efficient This makes exception throwing a bit more efficient, by removing some copies. gdb/ChangeLog 2019-04-08 Tom Tromey * common/common-exceptions.c (throw_exception): Rename from throw_exception_cxx. Remove old copy. Make argument const. (throw_it): Create and throw exception objects directly. * common/common-exceptions.h (throw_exception): Make argument const. (struct gdb_exception_error): Add constructor. (struct gdb_exception_quit): Add constructor. --- gdb/ChangeLog | 10 ++++++++++ gdb/common/common-exceptions.c | 33 ++++++++++++++++----------------- gdb/common/common-exceptions.h | 12 +++++++++++- 3 files changed, 37 insertions(+), 18 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 36b6b61..a0d8d09 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,5 +1,15 @@ 2019-04-08 Tom Tromey + * common/common-exceptions.c (throw_exception): Rename from + throw_exception_cxx. Remove old copy. Make argument const. + (throw_it): Create and throw exception objects directly. + * common/common-exceptions.h (throw_exception): Make argument + const. + (struct gdb_exception_error): Add constructor. + (struct gdb_exception_quit): Add constructor. + +2019-04-08 Tom Tromey + * common/common-exceptions.h (exception_rethrow): Don't declare. (TRY_SJLJ): Update comment. (TRY, CATCH, END_CATCH): Remove. diff --git a/gdb/common/common-exceptions.c b/gdb/common/common-exceptions.c index d3c01e5..83f2c74 100644 --- a/gdb/common/common-exceptions.c +++ b/gdb/common/common-exceptions.c @@ -180,8 +180,8 @@ throw_exception_sjlj (struct gdb_exception exception) /* Implementation of throw_exception that uses C++ try/catch. */ -static ATTRIBUTE_NORETURN void -throw_exception_cxx (struct gdb_exception exception) +void +throw_exception (const gdb_exception &exception) { if (exception.reason == RETURN_QUIT) { @@ -197,25 +197,24 @@ throw_exception_cxx (struct gdb_exception exception) gdb_assert_not_reached ("invalid return reason"); } -void -throw_exception (struct gdb_exception exception) -{ - throw_exception_cxx (exception); -} - static void ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF (3, 0) throw_it (enum return_reason reason, enum errors error, const char *fmt, va_list ap) { - struct gdb_exception e; - - /* Create the exception. */ - e.reason = reason; - e.error = error; - e.message.reset (new std::string (string_vprintf (fmt, ap))); - - /* Throw the exception. */ - throw_exception (e); + if (reason == RETURN_QUIT) + { + gdb_exception_quit ex (reason, error); + ex.message.reset (new std::string (string_vprintf (fmt, ap))); + throw ex; + } + else if (reason == RETURN_ERROR) + { + gdb_exception_error ex (reason, error); + ex.message.reset (new std::string (string_vprintf (fmt, ap))); + throw ex; + } + else + gdb_assert_not_reached ("invalid return reason"); } void diff --git a/gdb/common/common-exceptions.h b/gdb/common/common-exceptions.h index b09a34b..1aedb83 100644 --- a/gdb/common/common-exceptions.h +++ b/gdb/common/common-exceptions.h @@ -214,6 +214,11 @@ extern int exceptions_state_mc_catch (struct gdb_exception *, int); struct gdb_exception_error : public gdb_exception { + gdb_exception_error (enum return_reason r, enum errors e) + : gdb_exception (r, e) + { + } + explicit gdb_exception_error (const gdb_exception &ex) noexcept : gdb_exception (ex) { @@ -222,6 +227,11 @@ struct gdb_exception_error : public gdb_exception struct gdb_exception_quit : public gdb_exception { + gdb_exception_quit (enum return_reason r, enum errors e) + : gdb_exception (r, e) + { + } + explicit gdb_exception_quit (const gdb_exception &ex) noexcept : gdb_exception (ex) { @@ -250,7 +260,7 @@ struct gdb_quit_bad_alloc /* Throw an exception (as described by "struct gdb_exception"), landing in the inner most containing exception handler established using TRY/CATCH. */ -extern void throw_exception (struct gdb_exception exception) +extern void throw_exception (const gdb_exception &exception) ATTRIBUTE_NORETURN; /* Throw an exception by executing a LONG JUMP to the inner most -- 2.7.4