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Add support for reading frame registers to Python API.

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The ability to read registers is needed to use Frame Filter API to
display the frames created by JIT compilers.

gdb/ChangeLog:

2014-08-29  Sasha Smundak  <asmundak@google.com>

	* python/py-frame.c (frapy_read_register): New function.

gdb/doc/ChangeLog:

2014-08-26  Sasha Smundak  <asmundak@google.com>

	* python.texi (Frames in Python): Add read_register description.

gdb/testsuite/ChangeLog:

2014-08-26  Sasha Smundak  <asmundak@google.com>

	* gdb.python/py-frame.exp: Test Frame.read_register.
This commit is contained in:
Sasha Smundak 2014-09-03 16:34:47 -07:00 • committed by Doug Evans
parent ac740bc7a9
commit 5f3b99cfed
7 changed files with 77 additions and 0 deletions
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38
gdb/python/py-frame.c
View file

@ -28,6 +28,7 @@
#include "python-internal.h"
#include "symfile.h"
#include "objfiles.h"
#include "user-regs.h"
typedef struct {
PyObject_HEAD
@ -235,6 +236,40 @@ frapy_pc (PyObject *self, PyObject *args)
return gdb_py_long_from_ulongest (pc);
}
/* Implementation of gdb.Frame.read_register (self, register) -> gdb.Value.
Returns the value of a register in this frame. */
static PyObject *
frapy_read_register (PyObject *self, PyObject *args)
{
volatile struct gdb_exception except;
const char *regnum_str;
struct value *val = NULL;
if (!PyArg_ParseTuple (args, "s", &regnum_str))
return NULL;
TRY_CATCH (except, RETURN_MASK_ALL)
{
struct frame_info *frame;
int regnum;
FRAPY_REQUIRE_VALID (self, frame);
regnum = user_reg_map_name_to_regnum (get_frame_arch (frame),
regnum_str,
strlen (regnum_str));
if (regnum >= 0)
val = value_of_register (regnum, frame);
if (val == NULL)
PyErr_SetString (PyExc_ValueError, _("Unknown register."));
}
GDB_PY_HANDLE_EXCEPTION (except);
return val == NULL ? NULL : value_to_value_object (val);
}
/* Implementation of gdb.Frame.block (self) -> gdb.Block.
Returns the frame's code block. */
@ -674,6 +709,9 @@ Return the reason why it's not possible to find frames older than this." },
{ "pc", frapy_pc, METH_NOARGS,
"pc () -> Long.\n\
Return the frame's resume address." },
{ "read_register", frapy_read_register, METH_VARARGS,
"read_register (register_name) -> gdb.Value\n\
Return the value of the register in the frame." },
{ "block", frapy_block, METH_NOARGS,
"block () -> gdb.Block.\n\
Return the frame's code block." },