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List: gdb-cvs
Subject: [binutils-gdb] Make SJLJ exceptions more efficient
From: Tom Tromey <tromey () sourceware ! org>
Date: 2019-04-25 19:00:20
Message-ID: 20190425190020.57262.qmail () sourceware ! org
[Download RAW message or body]
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=c6fdd8b2052baa9b7a27d4d34f109c9622b53509
commit c6fdd8b2052baa9b7a27d4d34f109c9622b53509
Author: Tom Tromey <tromey@adacore.com>
Date: Tue Apr 23 07:29:49 2019 -0600
Make SJLJ exceptions more efficient
This changes the SJLJ exception handling code to be a bit more
efficient, by using rvalue references and move assignment when
possible.
Tested by the buildbot.
gdb/ChangeLog
2019-04-25 Tom Tromey <tromey@adacore.com>
* event-top.c (gdb_rl_callback_read_char_wrapper_noexcept)
(gdb_rl_callback_handler): Use std::move.
* common/common-exceptions.h (struct gdb_exception): Add move
assignment operator.
(throw_exception_sjlj): Change "exception" to const reference.
* common/common-exceptions.c (exceptions_state_mc_catch): Update.
(throw_exception_sjlj): Change "exception" to const reference.
Diff:
---
gdb/ChangeLog | 10 ++++++++++
gdb/common/common-exceptions.c | 5 +++--
gdb/common/common-exceptions.h | 4 +++-
gdb/event-top.c | 6 +++---
4 files changed, 19 insertions(+), 6 deletions(-)
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 106f0e6..809df46 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,15 @@
2019-04-25 Tom Tromey <tromey@adacore.com>
+ * event-top.c (gdb_rl_callback_read_char_wrapper_noexcept)
+ (gdb_rl_callback_handler): Use std::move.
+ * common/common-exceptions.h (struct gdb_exception): Add move
+ assignment operator.
+ (throw_exception_sjlj): Change "exception" to const reference.
+ * common/common-exceptions.c (exceptions_state_mc_catch): Update.
+ (throw_exception_sjlj): Change "exception" to const reference.
+
+2019-04-25 Tom Tromey <tromey@adacore.com>
+
* xml-support.c (gdb_xml_parser::gdb_xml_parser): Update.
* python/py-value.c (valpy_getitem, valpy_nonzero): Update.
* python/py-inferior.c (infpy_write_memory, infpy_search_memory):
diff --git a/gdb/common/common-exceptions.c b/gdb/common/common-exceptions.c
index 59c27ab..0b96cc6 100644
--- a/gdb/common/common-exceptions.c
+++ b/gdb/common/common-exceptions.c
@@ -166,14 +166,15 @@ exceptions_state_mc_action_iter_1 (void)
/* Return EXCEPTION to the nearest containing CATCH_SJLJ block. */
void
-throw_exception_sjlj (struct gdb_exception exception)
+throw_exception_sjlj (const struct gdb_exception &exception)
{
/* Jump to the nearest CATCH_SJLJ block, communicating REASON to
that call via setjmp's return value. Note that REASON can't be
zero, by definition in common-exceptions.h. */
exceptions_state_mc (CATCH_THROWING);
+ enum return_reason reason = exception.reason;
catchers.front ().exception = exception;
- longjmp (catchers.front ().buf, exception.reason);
+ longjmp (catchers.front ().buf, reason);
}
/* Implementation of throw_exception that uses C++ try/catch. */
diff --git a/gdb/common/common-exceptions.h b/gdb/common/common-exceptions.h
index 33fa8a9..d7b2550 100644
--- a/gdb/common/common-exceptions.h
+++ b/gdb/common/common-exceptions.h
@@ -152,6 +152,8 @@ struct gdb_exception
return *this;
}
+ gdb_exception &operator= (gdb_exception &&other) noexcept = default;
+
/* Return the contents of the exception message, as a C string. The
string remains owned by the exception object. */
const char *what () const noexcept
@@ -281,7 +283,7 @@ extern void throw_exception (const gdb_exception &exception)
containing exception handler established using TRY_SJLJ. Necessary
in some cases where we need to throw GDB exceptions across
third-party library code (e.g., readline). */
-extern void throw_exception_sjlj (struct gdb_exception exception)
+extern void throw_exception_sjlj (const struct gdb_exception &exception)
ATTRIBUTE_NORETURN;
/* Convenience wrappers around throw_exception that throw GDB
diff --git a/gdb/event-top.c b/gdb/event-top.c
index 959792d..bb8ba5c 100644
--- a/gdb/event-top.c
+++ b/gdb/event-top.c
@@ -178,7 +178,7 @@ gdb_rl_callback_read_char_wrapper_noexcept () noexcept
}
CATCH_SJLJ (ex, RETURN_MASK_ALL)
{
- gdb_expt = ex;
+ gdb_expt = std::move (ex);
}
END_CATCH_SJLJ
@@ -212,9 +212,9 @@ gdb_rl_callback_handler (char *rl) noexcept
{
ui->input_handler (gdb::unique_xmalloc_ptr<char> (rl));
}
- catch (const gdb_exception &ex)
+ catch (gdb_exception &ex)
{
- gdb_rl_expt = ex;
+ gdb_rl_expt = std::move (ex);
}
/* If we caught a GDB exception, longjmp out of the readline
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