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-Wwrite-strings: Add a PyArg_ParseTupleAndKeywords "const char *" overload

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-Wwrite-strings flags code like:

   static char *keywords[] = {"command", "from_tty", "to_string", NULL };

as needing "(char *)" casts, because string literals are "const char []".

We can get rid of the casts by changing the array type like this:

 -  static char *keywords[] = {"command", "from_tty", "to_string", NULL };
 +  static const char *keywords[] = {"command", "from_tty", "to_string", NULL };

However, passing the such array to PyArg_ParseTupleAndKeywords no longer
works OOTB, because PyArg_ParseTupleAndKeywords expects a "char **":

  PyArg_ParseTupleAndKeywords(PyObject *args, PyObject *kw,
                              const char *format,
			      char *keywords[], ...);

and "const char **" is not implicitly convertible to "char **".  C++
is more tolerant that C here WRT aliasing, and a const_cast<char **>
is fine.  However, to avoid having all callers do the cast themselves,
this commit defines a gdb_PyArg_ParseTupleAndKeywords function here
with a corresponding 'keywords' parameter type that does the cast in a
single place.

gdb/ChangeLog:
2017-04-05  Pedro Alves  <palves@redhat.com>

	* python/python-internal.h (gdb_PyArg_ParseTupleAndKeywords): New
	static inline function.
	* python/py-arch.c (archpy_disassemble): Constify 'keywords'
	array and use gdb_PyArg_ParseTupleAndKeywords.
	* python/py-cmd.c (cmdpy_init): Likewise.
	* python/py-finishbreakpoint.c (bpfinishpy_init): Likewise.
	* python/py-inferior.c (infpy_read_memory, infpy_write_memory)
	(infpy_search_memory): Likewise.
	* python/py-objfile.c (objfpy_add_separate_debug_file)
	(gdbpy_lookup_objfile): Likewise.
	* python/py-symbol.c (gdbpy_lookup_symbol)
	(gdbpy_lookup_global_symbol): Likewise.
	* python/py-type.c (gdbpy_lookup_type): Likewise.
	* python/py-value.c (valpy_lazy_string, valpy_string): Likewise.
	* python/python.c (execute_gdb_command, gdbpy_write, gdbpy_flush):
	Likewise.
This commit is contained in:
Pedro Alves 2017-04-05 19:21:36 +01:00
parent 0d1f4ceb39
commit 2adadf5170
12 changed files with 111 additions and 63 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
gdb/ChangeLog
View File

@ -1,3 +1,22 @@
2017-04-05 Pedro Alves <palves@redhat.com>
* python/python-internal.h (gdb_PyArg_ParseTupleAndKeywords): New
static inline function.
* python/py-arch.c (archpy_disassemble): Constify 'keywords'
array and use gdb_PyArg_ParseTupleAndKeywords.
* python/py-cmd.c (cmdpy_init): Likewise.
* python/py-finishbreakpoint.c (bpfinishpy_init): Likewise.
* python/py-inferior.c (infpy_read_memory, infpy_write_memory)
(infpy_search_memory): Likewise.
* python/py-objfile.c (objfpy_add_separate_debug_file)
(gdbpy_lookup_objfile): Likewise.
* python/py-symbol.c (gdbpy_lookup_symbol)
(gdbpy_lookup_global_symbol): Likewise.
* python/py-type.c (gdbpy_lookup_type): Likewise.
* python/py-value.c (valpy_lazy_string, valpy_string): Likewise.
* python/python.c (execute_gdb_command, gdbpy_write, gdbpy_flush):
Likewise.
2017-04-05 Pedro Alves <palves@redhat.com>
* python/python-internal.h (gdb_PyGetSetDef): New type.

7
gdb/python/py-arch.c
View File

@ -116,7 +116,7 @@ archpy_name (PyObject *self, PyObject *args)
static PyObject *
archpy_disassemble (PyObject *self, PyObject *args, PyObject *kw)
{
static char *keywords[] = { "start_pc", "end_pc", "count", NULL };
static const char *keywords[] = { "start_pc", "end_pc", "count", NULL };
CORE_ADDR start, end = 0;
CORE_ADDR pc;
gdb_py_ulongest start_temp;
@ -126,8 +126,9 @@ archpy_disassemble (PyObject *self, PyObject *args, PyObject *kw)
ARCHPY_REQUIRE_VALID (self, gdbarch);
if (!PyArg_ParseTupleAndKeywords (args, kw, GDB_PY_LLU_ARG "|OO", keywords,
&start_temp, &end_obj, &count_obj))
if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, GDB_PY_LLU_ARG "|OO",
keywords, &start_temp, &end_obj,
&count_obj))
return NULL;
start = start_temp;

10
gdb/python/py-breakpoint.c
View File

@ -637,8 +637,8 @@ bppy_get_ignore_count (PyObject *self, void *closure)
static int
bppy_init (PyObject *self, PyObject *args, PyObject *kwargs)
{
static char *keywords[] = { "spec", "type", "wp_class", "internal",
"temporary", NULL };
static const char *keywords[] = { "spec", "type", "wp_class", "internal",
"temporary", NULL };
const char *spec;
int type = bp_breakpoint;
int access_type = hw_write;
@ -647,9 +647,9 @@ bppy_init (PyObject *self, PyObject *args, PyObject *kwargs)
int internal_bp = 0;
int temporary_bp = 0;
if (! PyArg_ParseTupleAndKeywords (args, kwargs, "s|iiOO", keywords,
&spec, &type, &access_type,
&internal, &temporary))
if (!gdb_PyArg_ParseTupleAndKeywords (args, kwargs, "s|iiOO", keywords,
&spec, &type, &access_type,
&internal, &temporary))
return -1;
if (internal)

10
gdb/python/py-cmd.c
View File

@ -490,8 +490,8 @@ cmdpy_init (PyObject *self, PyObject *args, PyObject *kw)
char *docstring = NULL;
struct cmd_list_element **cmd_list;
char *cmd_name, *pfx_name;
static char *keywords[] = { "name", "command_class", "completer_class",
"prefix", NULL };
static const char *keywords[] = { "name", "command_class", "completer_class",
"prefix", NULL };
PyObject *is_prefix = NULL;
int cmp;
@ -504,9 +504,9 @@ cmdpy_init (PyObject *self, PyObject *args, PyObject *kw)
return -1;
}
if (! PyArg_ParseTupleAndKeywords (args, kw, "si|iO",
keywords, &name, &cmdtype,
&completetype, &is_prefix))
if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "si|iO",
keywords, &name, &cmdtype,
&completetype, &is_prefix))
return -1;
if (cmdtype != no_class && cmdtype != class_run

6
gdb/python/py-finishbreakpoint.c
View File

@ -156,7 +156,7 @@ bpfinishpy_post_stop_hook (struct gdbpy_breakpoint_object *bp_obj)
static int
bpfinishpy_init (PyObject *self, PyObject *args, PyObject *kwargs)
{
static char *keywords[] = { "frame", "internal", NULL };
static const char *keywords[] = { "frame", "internal", NULL };
struct finish_breakpoint_object *self_bpfinish =
(struct finish_breakpoint_object *) self;
PyObject *frame_obj = NULL;
@ -169,8 +169,8 @@ bpfinishpy_init (PyObject *self, PyObject *args, PyObject *kwargs)
CORE_ADDR pc;
struct symbol *function;
if (!PyArg_ParseTupleAndKeywords (args, kwargs, "|OO", keywords,
&frame_obj, &internal))
if (!gdb_PyArg_ParseTupleAndKeywords (args, kwargs, "|OO", keywords,
&frame_obj, &internal))
return -1;
TRY

33
gdb/python/py-inferior.c
View File

@ -435,10 +435,10 @@ infpy_read_memory (PyObject *self, PyObject *args, PyObject *kw)
CORE_ADDR addr, length;
gdb_byte *buffer = NULL;
PyObject *addr_obj, *length_obj, *result;
static char *keywords[] = { "address", "length", NULL };
static const char *keywords[] = { "address", "length", NULL };
if (! PyArg_ParseTupleAndKeywords (args, kw, "OO", keywords,
&addr_obj, &length_obj))
if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "OO", keywords,
&addr_obj, &length_obj))
return NULL;
if (get_addr_from_python (addr_obj, &addr) < 0
@ -494,21 +494,20 @@ infpy_write_memory (PyObject *self, PyObject *args, PyObject *kw)
const gdb_byte *buffer;
CORE_ADDR addr, length;
PyObject *addr_obj, *length_obj = NULL;
static char *keywords[] = { "address", "buffer", "length", NULL };
static const char *keywords[] = { "address", "buffer", "length", NULL };
#ifdef IS_PY3K
Py_buffer pybuf;
if (! PyArg_ParseTupleAndKeywords (args, kw, "Os*|O", keywords,
&addr_obj, &pybuf,
&length_obj))
if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "Os*|O", keywords,
&addr_obj, &pybuf, &length_obj))
return NULL;
buffer = (const gdb_byte *) pybuf.buf;
buf_len = pybuf.len;
#else
if (! PyArg_ParseTupleAndKeywords (args, kw, "Os#|O", keywords,
&addr_obj, &buffer, &buf_len,
&length_obj))
if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "Os#|O", keywords,
&addr_obj, &buffer, &buf_len,
&length_obj))
return NULL;
buffer = (const gdb_byte *) buffer;
@ -643,7 +642,7 @@ infpy_search_memory (PyObject *self, PyObject *args, PyObject *kw)
{
struct gdb_exception except = exception_none;
CORE_ADDR start_addr, length;
static char *keywords[] = { "address", "length", "pattern", NULL };
static const char *keywords[] = { "address", "length", "pattern", NULL };
PyObject *start_addr_obj, *length_obj;
Py_ssize_t pattern_size;
const gdb_byte *buffer;
@ -652,9 +651,9 @@ infpy_search_memory (PyObject *self, PyObject *args, PyObject *kw)
#ifdef IS_PY3K
Py_buffer pybuf;
if (! PyArg_ParseTupleAndKeywords (args, kw, "OOs*", keywords,
&start_addr_obj, &length_obj,
&pybuf))
if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "OOs*", keywords,
&start_addr_obj, &length_obj,
&pybuf))
return NULL;
buffer = (const gdb_byte *) pybuf.buf;
@ -663,9 +662,9 @@ infpy_search_memory (PyObject *self, PyObject *args, PyObject *kw)
PyObject *pattern;
const void *vbuffer;
if (! PyArg_ParseTupleAndKeywords (args, kw, "OOO", keywords,
&start_addr_obj, &length_obj,
&pattern))
if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "OOO", keywords,
&start_addr_obj, &length_obj,
&pattern))
return NULL;
if (!PyObject_CheckReadBuffer (pattern))

10
gdb/python/py-objfile.c
View File

@ -432,13 +432,13 @@ objfpy_is_valid (PyObject *self, PyObject *args)
static PyObject *
objfpy_add_separate_debug_file (PyObject *self, PyObject *args, PyObject *kw)
{
static char *keywords[] = { "file_name", NULL };
static const char *keywords[] = { "file_name", NULL };
objfile_object *obj = (objfile_object *) self;
const char *file_name;
OBJFPY_REQUIRE_VALID (obj);
if (!PyArg_ParseTupleAndKeywords (args, kw, "s", keywords, &file_name))
if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "s", keywords, &file_name))
return NULL;
TRY
@ -559,14 +559,14 @@ objfpy_lookup_objfile_by_build_id (const char *build_id)
PyObject *
gdbpy_lookup_objfile (PyObject *self, PyObject *args, PyObject *kw)
{
static char *keywords[] = { "name", "by_build_id", NULL };
static const char *keywords[] = { "name", "by_build_id", NULL };
const char *name;
PyObject *by_build_id_obj = NULL;
int by_build_id;
struct objfile *objfile;
if (! PyArg_ParseTupleAndKeywords (args, kw, "s|O!", keywords,
&name, &PyBool_Type, &by_build_id_obj))
if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "s|O!", keywords,
&name, &PyBool_Type, &by_build_id_obj))
return NULL;
by_build_id = 0;

13
gdb/python/py-symbol.c
View File

@ -373,13 +373,14 @@ gdbpy_lookup_symbol (PyObject *self, PyObject *args, PyObject *kw)
int domain = VAR_DOMAIN;
struct field_of_this_result is_a_field_of_this;
const char *name;
static char *keywords[] = { "name", "block", "domain", NULL };
static const char *keywords[] = { "name", "block", "domain", NULL };
struct symbol *symbol = NULL;
PyObject *block_obj = NULL, *sym_obj, *bool_obj;
const struct block *block = NULL;
if (! PyArg_ParseTupleAndKeywords (args, kw, "s|O!i", keywords, &name,
&block_object_type, &block_obj, &domain))
if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "s|O!i", keywords, &name,
&block_object_type, &block_obj,
&domain))
return NULL;
if (block_obj)
@ -443,12 +444,12 @@ gdbpy_lookup_global_symbol (PyObject *self, PyObject *args, PyObject *kw)
{
int domain = VAR_DOMAIN;
const char *name;
static char *keywords[] = { "name", "domain", NULL };
static const char *keywords[] = { "name", "domain", NULL };
struct symbol *symbol = NULL;
PyObject *sym_obj;
if (! PyArg_ParseTupleAndKeywords (args, kw, "s|i", keywords, &name,
&domain))
if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "s|i", keywords, &name,
&domain))
return NULL;
TRY

6
gdb/python/py-type.c
View File

@ -1347,14 +1347,14 @@ type_object_to_type (PyObject *obj)
PyObject *
gdbpy_lookup_type (PyObject *self, PyObject *args, PyObject *kw)
{
static char *keywords[] = { "name", "block", NULL };
static const char *keywords[] = { "name", "block", NULL };
const char *type_name = NULL;
struct type *type = NULL;
PyObject *block_obj = NULL;
const struct block *block = NULL;
if (! PyArg_ParseTupleAndKeywords (args, kw, "s|O", keywords,
&type_name, &block_obj))
if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "s|O", keywords,
&type_name, &block_obj))
return NULL;
if (block_obj)

12
gdb/python/py-value.c
View File

@ -431,11 +431,11 @@ valpy_lazy_string (PyObject *self, PyObject *args, PyObject *kw)
gdb_py_longest length = -1;
struct value *value = ((value_object *) self)->value;
const char *user_encoding = NULL;
static char *keywords[] = { "encoding", "length", NULL };
static const char *keywords[] = { "encoding", "length", NULL };
PyObject *str_obj = NULL;
if (!PyArg_ParseTupleAndKeywords (args, kw, "|s" GDB_PY_LL_ARG, keywords,
&user_encoding, &length))
if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "|s" GDB_PY_LL_ARG,
keywords, &user_encoding, &length))
return NULL;
if (length < -1)
@ -526,10 +526,10 @@ valpy_string (PyObject *self, PyObject *args, PyObject *kw)
const char *user_encoding = NULL;
const char *la_encoding = NULL;
struct type *char_type;
static char *keywords[] = { "encoding", "errors", "length", NULL };
static const char *keywords[] = { "encoding", "errors", "length", NULL };
if (!PyArg_ParseTupleAndKeywords (args, kw, "|ssi", keywords,
&user_encoding, &errors, &length))
if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "|ssi", keywords,
&user_encoding, &errors, &length))
return NULL;
TRY

28
gdb/python/python-internal.h
View File

@ -316,6 +316,34 @@ struct gdb_PyGetSetDef : PyGetSetDef
{}
};
/* The 'keywords' parameter of PyArg_ParseTupleAndKeywords has type
'char **'. However, string literals are const in C++, and so to
avoid casting at every keyword array definition, we'll need to make
the keywords array an array of 'const char *'. To avoid having all
callers add a 'const_cast<char **>' themselves when passing such an
array through 'char **', we define our own version of
PyArg_ParseTupleAndKeywords here with a corresponding 'keywords'
parameter type that does the cast in a single place. (This is not
an overload of PyArg_ParseTupleAndKeywords in order to make it
clearer that we're calling our own function instead of a function
that exists in some newer Python version.) */
static inline int
gdb_PyArg_ParseTupleAndKeywords (PyObject *args, PyObject *kw,
const char *format, const char **keywords, ...)
{
va_list ap;
int res;
va_start (ap, keywords);
res = PyArg_VaParseTupleAndKeywords (args, kw, format,
const_cast<char **> (keywords),
ap);
va_end (ap);
return res;
}
/* In order to be able to parse symtab_and_line_to_sal_object function
a real symtab_and_line structure is needed. */
#include "symtab.h"

20
gdb/python/python.c
View File

@ -572,11 +572,11 @@ execute_gdb_command (PyObject *self, PyObject *args, PyObject *kw)
const char *arg;
PyObject *from_tty_obj = NULL, *to_string_obj = NULL;
int from_tty, to_string;
static char *keywords[] = {"command", "from_tty", "to_string", NULL };
static const char *keywords[] = { "command", "from_tty", "to_string", NULL };
if (! PyArg_ParseTupleAndKeywords (args, kw, "s|O!O!", keywords, &arg,
&PyBool_Type, &from_tty_obj,
&PyBool_Type, &to_string_obj))
if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "s|O!O!", keywords, &arg,
&PyBool_Type, &from_tty_obj,
&PyBool_Type, &to_string_obj))
return NULL;
from_tty = 0;
@ -1047,11 +1047,11 @@ static PyObject *
gdbpy_write (PyObject *self, PyObject *args, PyObject *kw)
{
const char *arg;
static char *keywords[] = {"text", "stream", NULL };
static const char *keywords[] = { "text", "stream", NULL };
int stream_type = 0;
if (! PyArg_ParseTupleAndKeywords (args, kw, "s|i", keywords, &arg,
&stream_type))
if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "s|i", keywords, &arg,
&stream_type))
return NULL;
TRY
@ -1088,11 +1088,11 @@ gdbpy_write (PyObject *self, PyObject *args, PyObject *kw)
static PyObject *
gdbpy_flush (PyObject *self, PyObject *args, PyObject *kw)
{
static char *keywords[] = {"stream", NULL };
static const char *keywords[] = { "stream", NULL };
int stream_type = 0;
if (! PyArg_ParseTupleAndKeywords (args, kw, "|i", keywords,
&stream_type))
if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "|i", keywords,
&stream_type))
return NULL;
switch (stream_type)