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[PATCH 0/3] Introduce gdb::function_view & fix completion bug
- From: Pedro Alves <palves at redhat dot com>
- To: gdb-patches at sourceware dot org
- Date: Wed, 22 Feb 2017 14:50:30 +0000
- Subject: [PATCH 0/3] Introduce gdb::function_view & fix completion bug
- Authentication-results: sourceware.org; auth=none
I noticed that gdb.base/completion.exp fails when run with
--target_board=dwarf4-gdb-index. In order to fix it, I wanted to use
a lambda with iterate_over_symtabs. However, the C-style "function
pointer" + "data pointer" callback style we are still using doesn't
play well with lambdas with captures.
C++11 gave us std::function as type-erased wrapper around arbitrary
callables, however, as I explained at [1] in detail (with references),
std::function is not an ideal fit for transient callbacks. A better
type for that is a non-owning version of std::function. Using modern
C++17 terminology, the natural name for such an object is a "view",
thus "function_view". There are several examples of such a thing in
the interwebs. This series adds such a type to GDB.
This version is more complete than any other I've seen. It supports
function pointers efficiently without hitting undefined behavior, it
supports comparison with NULL like std::function, and it supports
referencing callables that return non-void when the function_view is
expecting void, just like std::function too. (Speaking of which, I've
looked at libstdc++'s std::function to compare APIs, and stolen a few
traits bits from there while at it). Unit tests to cover the whole
API are included too.
[1] - https://sourceware.org/ml/gdb-patches/2017-02/msg00535.html
Regtested on x86_64 Fedora 23, and build tested with GCC 4.8.5 too.
Also pushed to the users/palves/function-view branch on sourceware.org.
Pedro Alves (3):
Introduce gdb::function_view
Use gdb::function_view in iterate_over_symtabs & co
Fix gdb.base/completion.exp with --target_board=dwarf4-gdb-index
gdb/Makefile.in | 24 ++-
gdb/ada-lang.c | 107 ++++-------
gdb/common/function-view.h | 320 +++++++++++++++++++++++++++++++
gdb/compile/compile-c-support.c | 16 +-
gdb/dwarf2read.c | 51 +++--
gdb/language.h | 19 +-
gdb/linespec.c | 315 ++++++++++++++----------------
gdb/macrocmd.c | 31 ++-
gdb/macrotab.c | 17 +-
gdb/macrotab.h | 39 ++--
gdb/psymtab.c | 79 ++++----
gdb/symfile-debug.c | 42 ++--
gdb/symfile.c | 13 +-
gdb/symfile.h | 64 +++----
gdb/symmisc.c | 47 ++---
gdb/symtab.c | 329 ++++++++++----------------------
gdb/symtab.h | 33 ++--
gdb/unittests/function-view-selftests.c | 183 ++++++++++++++++++
18 files changed, 1002 insertions(+), 727 deletions(-)
create mode 100644 gdb/common/function-view.h
create mode 100644 gdb/unittests/function-view-selftests.c
--
2.5.5