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[PATCH v4 3/6] Support buffer objects as handles in Inferior.thread_from_thread_handle()
- From: Kevin Buettner <kevinb at redhat dot com>
- To: gdb-patches at sourceware dot org
- Cc: Kevin Buettner <kevinb at redhat dot com>
- Date: Thu, 4 Apr 2019 09:58:51 -0700
- Subject: [PATCH v4 3/6] Support buffer objects as handles in Inferior.thread_from_thread_handle()
- References: <20190404165854.17343-1-kevinb@redhat.com>
InferiorThread.handle() returns a python bytes object. We'd like to
be able to pass the output of this function, a thread handle, to
Inferior.thread_from_thread_handle(). Up to now,
thread_from_thread_handle() expects to receive a gdb.Value input.
This commit adds support to also allow a python buffer object to be
passed as the handle.
infpy_thread_from_thread_handle() calls find_thread_by_handle() which
has the obvious functionality. It used to pass the thread handle via
a struct value pointer. I've revised this interface to instead pass a
gdb::array_view<const gdb_byte> object. (Thanks to Tom Tromey for
suggesting this data structure over an earlier version which passed a
gdb_byte pointer and length.)
gdb/ChangeLog:
* gdbthread.h (find_thread_by_handle): Revise declaration.
* thread.c (find_thread_by_handle): Likewise. Adjust
implementation too.
* python/py-inferior.c (infpy_thread_from_thread_handle): Add
support for buffer objects as handles.
---
gdb/gdbthread.h | 4 ++--
gdb/python/py-inferior.c | 25 ++++++++++++++++++++++---
gdb/thread.c | 10 +++++-----
3 files changed, 29 insertions(+), 10 deletions(-)
diff --git a/gdb/gdbthread.h b/gdb/gdbthread.h
index 37c7910635..d89cadbab9 100644
--- a/gdb/gdbthread.h
+++ b/gdb/gdbthread.h
@@ -486,8 +486,8 @@ extern struct thread_info *find_thread_ptid (inferior *inf, ptid_t ptid);
struct thread_info *find_thread_global_id (int global_id);
/* Find thread by thread library specific handle in inferior INF. */
-struct thread_info *find_thread_by_handle (struct value *thread_handle,
- struct inferior *inf);
+struct thread_info *find_thread_by_handle
+ (gdb::array_view<const gdb_byte> handle, struct inferior *inf);
/* Finds the first thread of the specified inferior. */
extern struct thread_info *first_thread_of_inferior (inferior *inf);
diff --git a/gdb/python/py-inferior.c b/gdb/python/py-inferior.c
index 72fbf6d90b..7129815b21 100644
--- a/gdb/python/py-inferior.c
+++ b/gdb/python/py-inferior.c
@@ -774,7 +774,25 @@ infpy_thread_from_thread_handle (PyObject *self, PyObject *args, PyObject *kw)
if (! gdb_PyArg_ParseTupleAndKeywords (args, kw, "O", keywords, &handle_obj))
return NULL;
- if (!gdbpy_is_value_object (handle_obj))
+ const gdb_byte *bytes;
+ size_t bytes_len;
+ Py_buffer_up buffer_up;
+ Py_buffer py_buf;
+
+ if (PyObject_CheckBuffer (handle_obj)
+ && PyObject_GetBuffer (handle_obj, &py_buf, PyBUF_SIMPLE) == 0)
+ {
+ buffer_up.reset (&py_buf);
+ bytes = (const gdb_byte *) py_buf.buf;
+ bytes_len = py_buf.len;
+ }
+ else if (gdbpy_is_value_object (handle_obj))
+ {
+ struct value *val = value_object_to_value (handle_obj);
+ bytes = value_contents_all (val);
+ bytes_len = TYPE_LENGTH (value_type (val));
+ }
+ else
{
PyErr_SetString (PyExc_TypeError,
_("Argument 'handle_obj' must be a thread handle object."));
@@ -785,9 +803,10 @@ infpy_thread_from_thread_handle (PyObject *self, PyObject *args, PyObject *kw)
TRY
{
struct thread_info *thread_info;
- struct value *val = value_object_to_value (handle_obj);
- thread_info = find_thread_by_handle (val, inf_obj->inferior);
+ thread_info = find_thread_by_handle
+ (gdb::array_view<const gdb_byte> (bytes, bytes_len),
+ inf_obj->inferior);
if (thread_info != NULL)
return thread_to_thread_object (thread_info).release ();
}
diff --git a/gdb/thread.c b/gdb/thread.c
index 0879549b8a..8f6b762add 100644
--- a/gdb/thread.c
+++ b/gdb/thread.c
@@ -541,12 +541,12 @@ find_thread_ptid (inferior *inf, ptid_t ptid)
/* See gdbthread.h. */
struct thread_info *
-find_thread_by_handle (struct value *thread_handle, struct inferior *inf)
+find_thread_by_handle (gdb::array_view<const gdb_byte> handle,
+ struct inferior *inf)
{
- return target_thread_handle_to_thread_info
- (value_contents_all (thread_handle),
- TYPE_LENGTH (value_type (thread_handle)),
- inf);
+ return target_thread_handle_to_thread_info (handle.data (),
+ handle.size (),
+ inf);
}
/*
--
2.20.1