[PATCH 01/13] Stop assuming no-debug-info functions return int

Pedro Alves
2017-07-13T02:19:48Z

The fact that GDB defaults to assuming that functions return int, when
it has no debug info for the function has been a recurring source of
user confusion. Recently this came up on the errno pretty printer
discussions. Shortly after, it came up again on IRC, with someone
wondering why does getenv() in GDB return a negative int:

(gdb) p getenv("PATH")
$1 = -6185

This question (with s/getenv/random-other-C-runtime-function) is a FAQ
on IRC.

The reason for the above is:

(gdb) p getenv
$2 = {<text variable, no debug info>} 0x7ffff7751d80 <getenv>
(gdb) ptype getenv
type = int ()

... which means that GDB truncated the 64-bit pointer that is actually
returned from getent to 32-bit, and then sign-extended it:

(gdb) p /x -6185
$6 = 0xffffe7d7

The workaround is to cast the function to the right type, like:

(gdb) p ((char *(*) (const char *)) getenv) ("PATH")
$3 = 0x7fffffffe7d7 "/usr/local/bin:/"...

IMO, we should do better than this.

I see the "assume-int" issue the same way I see printing bogus values
for optimized-out variables instead of "<optimized out>" -- I'd much
rather that the debugger tells me "I don't know" and tells me how to
fix it than showing me bogus misleading results, making me go around
tilting at windmills.

If GDB prints a signed integer when you're expecting a pointer or
aggregate, you at least have some sense that something is off, but
consider the case of the function actually returning a 64-bit integer.
For example, compile this without debug info:

unsigned long long
function ()
{
return 0x7fffffffffffffff;
}

Currently, with pristine GDB, you get:

(gdb) p function ()
$1 = -1 # incorrect
(gdb) p /x function ()
$2 = 0xffffffff # incorrect

maybe after spending a few hours debugging you suspect something is
wrong with that -1, and do:

(gdb) ptype function
type = int ()

and maybe, just maybe, you realize that the function actually returns
unsigned long long. And you try to fix it with:

(gdb) p /x (unsigned long long) function ()
$3 = 0xffffffffffffffff # incorrect

... which still produces the wrong result, because GDB simply applied
int to unsigned long long conversion. Meaning, it sign-extended the
integer that it extracted from the return of the function, to 64-bits.

and then maybe, after asking around on IRC, you realize you have to
cast the function to a pointer of the right type, and call that. It
won't be easy, but after a few missteps, you'll get to it:

..... (gdb) p /x ((unsigned long long(*) ()) function) ()
$666 = 0x7fffffffffffffff # finally! :-)

So to improve on the user experience, this patch does the following
(interrelated) things:

- makes no-debug-info functions no longer default to "int" as return
type. Instead, they're left with NULL/"<unknown return type>"
return type.

(gdb) ptype getenv
type = <unknown return type> ()

- makes calling a function with unknown return type an error.

(gdb) p getenv ("PATH")
'getenv' has unknown return type; cast the call to its declared return type

- and then to make it easier to call the function, makes it possible
to _only_ cast the return of the function to the right type,
instead of having to cast function to a function pointer:

(gdb) p (char *) getenv ("PATH") # now Just Works
$3 = 0x7fffffffe7d7 "/usr/local/bin:/"...

(gdb) p ((char *(*) (const char *)) getenv) ("PATH") # continues working
$4 = 0x7fffffffe7d7 "/usr/local/bin:/"...

I.e., it makes GDB default the function's return type to the type
of the cast.

After this patch, here's what you'll get for the "unsigned long long"
example above:

(gdb) p function ()
'function' has unknown return type; cast the call to its declared return type
(gdb) p /x (unsigned long long) function ()
$4 = 0x7fffffffffffffff # correct!

Note that while with "print" GDB shows the name of the function that
has the problem:

(gdb) p getenv ("PATH")
'getenv' has unknown return type; cast the call to its declared return type

which can by handy in more complicated expressions, "ptype" does not:

(gdb) ptype getenv ("PATH")
function has unknown return type; cast the call to its declared return type

This will be fixed in the next patch.

gdb/ChangeLog:
yyyy-dd-mm Pedro Alves <palves@redhat.com>

* ada-lang.c (ada_evaluate_subexp) <TYPE_CODE_FUNC>: Don't handle
TYPE_GNU_IFUNC specially here. Throw error if return type is
unknown.
* ada-typeprint.c (print_func_type): Handle functions with unknown
return type.
* c-typeprint.c (c_type_print_base): Handle functions and methods
with unknown return type.
* compile/compile-c-symbols.c (convert_symbol_bmsym)
<mst_text_gnu_ifunc>: Use nodebug_text_gnu_ifunc_symbol.
* compile/compile-c-types.c: Include "objfiles.h".
(convert_func): For functions with unknown return type, warn and
default to int.
* compile/compile-object-run.c (compile_object_run): Adjust call
to call_function_by_hand_dummy.
* elfread.c (elf_gnu_ifunc_resolve_addr): Adjust call to
call_function_by_hand.
* eval.c (evaluate_subexp_standard): Adjust calls to
call_function_by_hand. Handle functions and methods with unknown
return type. Pass expect_type to call_function_by_hand.
* f-typeprint.c (f_type_print_base): Handle functions with unknown
return type.
* gcore.c (call_target_sbrk): Adjust call to
call_function_by_hand.
* gdbtypes.c (objfile_type): Leave nodebug text symbol with NULL
return type instead of int. Make nodebug_text_gnu_ifunc_symbol be
an integer address type instead of nodebug.
* guile/scm-value.c (gdbscm_value_call): Adjust call to
call_function_by_hand.
* infcall.c (error_call_unknown_return_type): New function.
(call_function_by_hand): New "default_return_type" parameter.
Pass it down.
(call_function_by_hand_dummy): New "default_return_type"
parameter. Use it instead of defaulting to int. If there's no
default and the return type is unknown, throw an error.
* infcall.h (call_function_by_hand, call_function_by_hand_dummy):
New "default_return_type" parameter.
(error_call_unknown_return_type): New declaration.
* linux-fork.c (call_lseek): Cast return type of lseek.
(inferior_call_waitpid, checkpoint_command): Adjust calls to
call_function_by_hand.
* linux-tdep.c (linux_infcall_mmap, linux_infcall_munmap): Adjust
calls to call_function_by_hand.
* m2-typeprint.c (m2_procedure): Handle functions with unknown
return type.
* objc-lang.c (lookup_objc_class, lookup_child_selector)
(value_nsstring, print_object_command): Adjust calls to
call_function_by_hand.
* p-typeprint.c (pascal_type_print_varspec_prefix): Handle
functions with unknown return type.
(pascal_type_print_func_varspec_suffix): New function.
(pascal_type_print_varspec_suffix) <TYPE_CODE_FUNC,
TYPE_CODE_METHOD>: Use it.
* python/py-value.c (valpy_call): Adjust call to
call_function_by_hand.
* rust-lang.c (rust_evaluate_funcall): Adjust call to
call_function_by_hand.
* valarith.c (value_x_binop, value_x_unop): Adjust calls to
call_function_by_hand.
* valops.c (value_allocate_space_in_inferior): Adjust call to
call_function_by_hand.
* typeprint.c (type_print_unknown_return_type): New function.
* typeprint.h (type_print_unknown_return_type): New declaration.

gdb/testsuite/ChangeLog:
yyyy-dd-mm Pedro Alves <palves@redhat.com>

* gdb.base/break-main-file-remove-fail.exp (test_remove_bp): Cast
return type of munmap in infcall.
* gdb.base/break-probes.exp: Cast return type of foo in infcall.
* gdb.base/checkpoint.exp: Simplify using for loop. Cast return
type of ftell in infcall.
* gdb.base/dprintf-detach.exp (dprintf_detach_test): Cast return
type of getpid in infcall.
* gdb.base/infcall-exec.exp: Cast return type of execlp in
infcall.
* gdb.base/info-os.exp: Cast return type of getpid in infcall.
Bail on failure to extract the pid.
* gdb.base/nodebug.exp: Change expected output of
print/whatis/ptype with functions with no debug info. Test all
supported languages.
* gdb.compile/compile.exp: Adjust expected output to expect
warning.
* gdb.threads/siginfo-threads.exp: Likewise.
---
gdb/ada-lang.c | 10 ++-
gdb/ada-typeprint.c | 7 +-
gdb/c-typeprint.c | 10 ++-
gdb/compile/compile-c-symbols.c | 4 +-
gdb/compile/compile-c-types.c | 20 +++++-
gdb/compile/compile-object-run.c | 3 +-
gdb/elfread.c | 2 +-
gdb/eval.c | 41 ++++++-----
gdb/f-typeprint.c | 7 +-
gdb/gcore.c | 2 +-
gdb/gdbtypes.c | 6 +-
gdb/guile/scm-value.c | 2 +-
gdb/infcall.c | 34 ++++++++--
gdb/infcall.h | 19 +++++-
gdb/linux-fork.c | 6 +-
gdb/linux-tdep.c | 4 +-
gdb/m2-typeprint.c | 11 +--
gdb/objc-lang.c | 14 ++--
gdb/p-typeprint.c | 57 ++++++++++------
gdb/python/py-value.c | 3 +-
gdb/rust-lang.c | 2 +-
.../gdb.base/break-main-file-remove-fail.exp | 2 +-
gdb/testsuite/gdb.base/break-probes.exp | 2 +-
gdb/testsuite/gdb.base/checkpoint.exp | 44 ++----------
gdb/testsuite/gdb.base/dprintf-detach.exp | 2 +-
gdb/testsuite/gdb.base/infcall-exec.exp | 2 +-
gdb/testsuite/gdb.base/info-os.exp | 8 ++-
gdb/testsuite/gdb.base/nodebug.exp | 79 ++++++++++++++++++----
gdb/testsuite/gdb.compile/compile.exp | 10 +--
gdb/testsuite/gdb.threads/siginfo-threads.exp | 7 +-
gdb/typeprint.c | 9 ++-
gdb/typeprint.h | 4 ++
gdb/valarith.c | 4 +-
gdb/valops.c | 2 +-
34 files changed, 286 insertions(+), 153 deletions(-)

diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
index ea60df2..77c5866 100644
--- a/gdb/ada-lang.c
+++ b/gdb/ada-lang.c
@@ -10807,13 +10807,11 @@ ada_evaluate_subexp (struct type *expect_type, struct expression *exp,
case TYPE_CODE_FUNC:
if (noside == EVAL_AVOID_SIDE_EFFECTS)
{
- struct type *rtype = TYPE_TARGET_TYPE (type);
-
- if (TYPE_GNU_IFUNC (type))
- return allocate_value (TYPE_TARGET_TYPE (rtype));
- return allocate_value (rtype);
+ if (TYPE_TARGET_TYPE (type) == NULL)
+ error_call_unknown_return_type (NULL);
+ return allocate_value (TYPE_TARGET_TYPE (type));
}
- return call_function_by_hand (argvec[0], nargs, argvec + 1);
+ return call_function_by_hand (argvec[0], NULL, nargs, argvec + 1);
case TYPE_CODE_INTERNAL_FUNCTION:
if (noside == EVAL_AVOID_SIDE_EFFECTS)
/* We don't know anything about what the internal
diff --git a/gdb/ada-typeprint.c b/gdb/ada-typeprint.c
index 3c33bdc..65b8084 100644
--- a/gdb/ada-typeprint.c
+++ b/gdb/ada-typeprint.c
@@ -775,7 +775,8 @@ print_func_type (struct type *type, struct ui_file *stream, const char *name,
{
int i, len = TYPE_NFIELDS (type);

- if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_VOID)
+ if (TYPE_TARGET_TYPE (type) != NULL
+ && TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_VOID)
fprintf_filtered (stream, "procedure");
else
fprintf_filtered (stream, "function");
@@ -800,7 +801,9 @@ print_func_type (struct type *type, struct ui_file *stream, const char *name,
fprintf_filtered (stream, ")");
}

- if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_VOID)
+ if (TYPE_TARGET_TYPE (type) == NULL)
+ fprintf_filtered (stream, " return <unknown return type>");
+ else if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_VOID)
{
fprintf_filtered (stream, " return ");
ada_print_type (TYPE_TARGET_TYPE (type), "", stream, 0, 0, flags);
diff --git a/gdb/c-typeprint.c b/gdb/c-typeprint.c
index 9e197f5..64bb51c 100644
--- a/gdb/c-typeprint.c
+++ b/gdb/c-typeprint.c
@@ -893,13 +893,19 @@ c_type_print_base (struct type *type, struct ui_file *stream,
fprintf_filtered (stream, _("<unnamed typedef>"));
break;

+ case TYPE_CODE_FUNC:
+ case TYPE_CODE_METHOD:
+ if (TYPE_TARGET_TYPE (type) == NULL)
+ type_print_unknown_return_type (stream);
+ else
+ c_type_print_base (TYPE_TARGET_TYPE (type),
+ stream, show, level, flags);
+ break;
case TYPE_CODE_ARRAY:
case TYPE_CODE_PTR:
case TYPE_CODE_MEMBERPTR:
case TYPE_CODE_REF:
case TYPE_CODE_RVALUE_REF:
- case TYPE_CODE_FUNC:
- case TYPE_CODE_METHOD:
case TYPE_CODE_METHODPTR:
c_type_print_base (TYPE_TARGET_TYPE (type),
stream, show, level, flags);
diff --git a/gdb/compile/compile-c-symbols.c b/gdb/compile/compile-c-symbols.c
index 15e1d6d..c5ec941 100644
--- a/gdb/compile/compile-c-symbols.c
+++ b/gdb/compile/compile-c-symbols.c
@@ -379,9 +379,7 @@ convert_symbol_bmsym (struct compile_c_instance *context,
break;

case mst_text_gnu_ifunc:
- /* nodebug_text_gnu_ifunc_symbol would cause:
- function return type cannot be function */
- type = objfile_type (objfile)->nodebug_text_symbol;
+ type = objfile_type (objfile)->nodebug_text_gnu_ifunc_symbol;
kind = GCC_C_SYMBOL_FUNCTION;
addr = gnu_ifunc_resolve_addr (target_gdbarch (), addr);
break;
diff --git a/gdb/compile/compile-c-types.c b/gdb/compile/compile-c-types.c
index 22aee78..7fbab13 100644
--- a/gdb/compile/compile-c-types.c
+++ b/gdb/compile/compile-c-types.c
@@ -21,6 +21,8 @@
#include "defs.h"
#include "gdbtypes.h"
#include "compile-internal.h"
+#include "objfiles.h"
+
/* An object that maps a gdb type to a gcc type. */

struct type_map_instance
@@ -234,9 +236,25 @@ convert_func (struct compile_c_instance *context, struct type *type)
struct gcc_type_array array;
int is_varargs = TYPE_VARARGS (type) || !TYPE_PROTOTYPED (type);

+ struct type *target_type = TYPE_TARGET_TYPE (type);
+
+ /* Functions with no debug info have no return type. Ideally we'd
+ want to fallback to the type of the cast just before the
+ function, like GDB's built-in expression parser, but we don't
+ have access to that type here. For now, fallback to int, like
+ GDB's parser used to do. */
+ if (target_type == NULL)
+ {
+ if (TYPE_OBJFILE_OWNED (type))
+ target_type = objfile_type (TYPE_OWNER (type).objfile)->builtin_int;
+ else
+ target_type = builtin_type (TYPE_OWNER (type).gdbarch)->builtin_int;
+ warning (_("function has unknown return type; assuming int"));
+ }
+
/* This approach means we can't make self-referential function
types. Those are impossible in C, though. */
- return_type = convert_type (context, TYPE_TARGET_TYPE (type));
+ return_type = convert_type (context, target_type);

array.n_elements = TYPE_NFIELDS (type);
array.elements = XNEWVEC (gcc_type, TYPE_NFIELDS (type));
diff --git a/gdb/compile/compile-object-run.c b/gdb/compile/compile-object-run.c
index de5fa16..43da59f 100644
--- a/gdb/compile/compile-object-run.c
+++ b/gdb/compile/compile-object-run.c
@@ -172,7 +172,8 @@ compile_object_run (struct compile_module *module)
++current_arg;
}
gdb_assert (current_arg == TYPE_NFIELDS (func_type));
- call_function_by_hand_dummy (func_val, TYPE_NFIELDS (func_type), vargs,
+ call_function_by_hand_dummy (func_val,
+ NULL, TYPE_NFIELDS (func_type), vargs,
do_module_cleanup, data);
}
CATCH (ex, RETURN_MASK_ERROR)
diff --git a/gdb/elfread.c b/gdb/elfread.c
index fba2026..b34cdd5 100644
--- a/gdb/elfread.c
+++ b/gdb/elfread.c
@@ -889,7 +889,7 @@ elf_gnu_ifunc_resolve_addr (struct gdbarch *gdbarch, CORE_ADDR pc)
target_auxv_search (&current_target, AT_HWCAP, &hwcap);
hwcap_val = value_from_longest (builtin_type (gdbarch)
->builtin_unsigned_long, hwcap);
- address_val = call_function_by_hand (function, 1, &hwcap_val);
+ address_val = call_function_by_hand (function, NULL, 1, &hwcap_val);
address = value_as_address (address_val);
address = gdbarch_convert_from_func_ptr_addr (gdbarch, address,
&current_target);
diff --git a/gdb/eval.c b/gdb/eval.c
index 80dfb2e..1ec6751 100644
--- a/gdb/eval.c
+++ b/gdb/eval.c
@@ -1147,12 +1147,12 @@ evaluate_subexp_standard (struct type *expect_type,
argvec[3] = value_from_longest (long_type, selector);
argvec[4] = 0;

- ret = call_function_by_hand (argvec[0], 3, argvec + 1);
+ ret = call_function_by_hand (argvec[0], NULL, 3, argvec + 1);
if (gnu_runtime)
{
/* Function objc_msg_lookup returns a pointer. */
argvec[0] = ret;
- ret = call_function_by_hand (argvec[0], 3, argvec + 1);
+ ret = call_function_by_hand (argvec[0], NULL, 3, argvec + 1);
}
if (value_as_long (ret) == 0)
error (_("Target does not respond to this message selector."));
@@ -1169,11 +1169,11 @@ evaluate_subexp_standard (struct type *expect_type,
argvec[3] = value_from_longest (long_type, selector);
argvec[4] = 0;

- ret = call_function_by_hand (argvec[0], 3, argvec + 1);
+ ret = call_function_by_hand (argvec[0], NULL, 3, argvec + 1);
if (gnu_runtime)
{
argvec[0] = ret;
- ret = call_function_by_hand (argvec[0], 3, argvec + 1);
+ ret = call_function_by_hand (argvec[0], NULL, 3, argvec + 1);
}

/* ret should now be the selector. */
@@ -1315,10 +1315,10 @@ evaluate_subexp_standard (struct type *expect_type,
deprecated_set_value_type (argvec[0],
lookup_pointer_type (lookup_function_type (value_type (argvec[0]))));
argvec[0]
- = call_function_by_hand (argvec[0], nargs + 2, argvec + 1);
+ = call_function_by_hand (argvec[0], NULL, nargs + 2, argvec + 1);
}

- ret = call_function_by_hand (argvec[0], nargs + 2, argvec + 1);
+ ret = call_function_by_hand (argvec[0], NULL, nargs + 2, argvec + 1);
return ret;
}
break;
@@ -1705,12 +1705,9 @@ evaluate_subexp_standard (struct type *expect_type,
error (_("Cannot evaluate function -- may be inlined"));
if (noside == EVAL_AVOID_SIDE_EFFECTS)
{
- /* If the return type doesn't look like a function type, call an
- error. This can happen if somebody tries to turn a variable into
- a function call. This is here because people often want to
- call, eg, strcmp, which gdb doesn't know is a function. If
- gdb isn't asked for it's opinion (ie. through "whatis"),
- it won't offer it. */
+ /* If the return type doesn't look like a function type,
+ call an error. This can happen if somebody tries to turn
+ a variable into a function call. */

struct type *ftype = value_type (argvec[0]);

@@ -1731,10 +1728,19 @@ evaluate_subexp_standard (struct type *expect_type,
error (_("Xmethod is missing return type."));
return value_zero (return_type, not_lval);
}
- else if (TYPE_GNU_IFUNC (ftype))
- return allocate_value (TYPE_TARGET_TYPE (TYPE_TARGET_TYPE (ftype)));
- else if (TYPE_TARGET_TYPE (ftype))
- return allocate_value (TYPE_TARGET_TYPE (ftype));
+ else if (TYPE_CODE (ftype) == TYPE_CODE_FUNC
+ || TYPE_CODE (ftype) == TYPE_CODE_METHOD)
+ {
+ struct type *return_type = TYPE_TARGET_TYPE (ftype);
+
+ if (return_type == NULL)
+ return_type = expect_type;
+
+ if (return_type == NULL)
+ error_call_unknown_return_type (NULL);
+
+ return allocate_value (return_type);
+ }
else
error (_("Expression of type other than "
"\"Function returning ...\" used as function"));
@@ -1747,7 +1753,8 @@ evaluate_subexp_standard (struct type *expect_type,
case TYPE_CODE_XMETHOD:
return call_xmethod (argvec[0], nargs, argvec + 1);
default:
- return call_function_by_hand (argvec[0], nargs, argvec + 1);
+ return call_function_by_hand (argvec[0],
+ expect_type, nargs, argvec + 1);
}
/* pai: FIXME save value from call_function_by_hand, then adjust
pc by adjust_fn_pc if +ve. */
diff --git a/gdb/f-typeprint.c b/gdb/f-typeprint.c
index 7dbe093..2a858aa 100644
--- a/gdb/f-typeprint.c
+++ b/gdb/f-typeprint.c
@@ -304,9 +304,14 @@ f_type_print_base (struct type *type, struct ui_file *stream, int show,
break;

case TYPE_CODE_ARRAY:
- case TYPE_CODE_FUNC:
f_type_print_base (TYPE_TARGET_TYPE (type), stream, show, level);
break;
+ case TYPE_CODE_FUNC:
+ if (TYPE_TARGET_TYPE (type) == NULL)
+ type_print_unknown_return_type (stream);
+ else
+ f_type_print_base (TYPE_TARGET_TYPE (type), stream, show, level);
+ break;

case TYPE_CODE_PTR:
fprintf_filtered (stream, "PTR TO -> ( ");
diff --git a/gdb/gcore.c b/gdb/gcore.c
index c32d2ff..687ad8c 100644
--- a/gdb/gcore.c
+++ b/gdb/gcore.c
@@ -302,7 +302,7 @@ call_target_sbrk (int sbrk_arg)
target_sbrk_arg = value_from_longest (builtin_type (gdbarch)->builtin_int,
sbrk_arg);
gdb_assert (target_sbrk_arg);
- ret = call_function_by_hand (sbrk_fn, 1, &target_sbrk_arg);
+ ret = call_function_by_hand (sbrk_fn, NULL, 1, &target_sbrk_arg);
if (ret == NULL)
return (bfd_vma) 0;

diff --git a/gdb/gdbtypes.c b/gdb/gdbtypes.c
index a686923..5eb6cdb 100644
--- a/gdb/gdbtypes.c
+++ b/gdb/gdbtypes.c
@@ -5310,13 +5310,13 @@ objfile_type (struct objfile *objfile)
objfile_type->nodebug_text_symbol
= init_type (objfile, TYPE_CODE_FUNC, 1,
"<text variable, no debug info>");
- TYPE_TARGET_TYPE (objfile_type->nodebug_text_symbol)
- = objfile_type->builtin_int;
objfile_type->nodebug_text_gnu_ifunc_symbol
= init_type (objfile, TYPE_CODE_FUNC, 1,
"<text gnu-indirect-function variable, no debug info>");
+ /* Ifunc resolvers return a function address. */
TYPE_TARGET_TYPE (objfile_type->nodebug_text_gnu_ifunc_symbol)
- = objfile_type->nodebug_text_symbol;
+ = init_integer_type (objfile, gdbarch_addr_bit (gdbarch), 1,
+ "__IFUNC_RESOLVER_RET");
TYPE_GNU_IFUNC (objfile_type->nodebug_text_gnu_ifunc_symbol) = 1;
objfile_type->nodebug_got_plt_symbol
= init_pointer_type (objfile, gdbarch_addr_bit (gdbarch),
diff --git a/gdb/guile/scm-value.c b/gdb/guile/scm-value.c
index f631032..0dc6630 100644
--- a/gdb/guile/scm-value.c
+++ b/gdb/guile/scm-value.c
@@ -864,7 +864,7 @@ gdbscm_value_call (SCM self, SCM args)
struct cleanup *cleanup = make_cleanup_value_free_to_mark (mark);
struct value *return_value;

- return_value = call_function_by_hand (function, args_count, vargs);
+ return_value = call_function_by_hand (function, NULL, args_count, vargs);
result = vlscm_scm_from_value (return_value);
do_cleanups (cleanup);
}
diff --git a/gdb/infcall.c b/gdb/infcall.c
index 38335a7..9593875 100644
--- a/gdb/infcall.c
+++ b/gdb/infcall.c
@@ -340,6 +340,20 @@ push_dummy_code (struct gdbarch *gdbarch,
regcache);
}

+/* See infcall.h. */
+
+void
+error_call_unknown_return_type (const char *func_name)
+{
+ if (func_name != NULL)
+ error (_("'%s' has unknown return type; "
+ "cast the call to its declared return type"),
+ func_name);
+ else
+ error (_("function has unknown return type; "
+ "cast the call to its declared return type"));
+}
+
/* Fetch the name of the function at FUNADDR.
This is used in printing an error message for call_function_by_hand.
BUF is used to print FUNADDR in hex if the function name cannot be
@@ -673,9 +687,12 @@ cleanup_delete_std_terminate_breakpoint (void *ignore)
/* See infcall.h. */

struct value *
-call_function_by_hand (struct value *function, int nargs, struct value **args)
+call_function_by_hand (struct value *function,
+ type *default_return_type,
+ int nargs, struct value **args)
{
- return call_function_by_hand_dummy (function, nargs, args, NULL, NULL);
+ return call_function_by_hand_dummy (function, default_return_type,
+ nargs, args, NULL, NULL);
}

/* All this stuff with a dummy frame may seem unnecessarily complicated
@@ -698,6 +715,7 @@ call_function_by_hand (struct value *function, int nargs, struct value **args)

struct value *
call_function_by_hand_dummy (struct value *function,
+ type *default_return_type,
int nargs, struct value **args,
dummy_frame_dtor_ftype *dummy_dtor,
void *dummy_dtor_data)
@@ -850,8 +868,16 @@ call_function_by_hand_dummy (struct value *function,
}

funaddr = find_function_addr (function, &values_type);
- if (!values_type)
- values_type = builtin_type (gdbarch)->builtin_int;
+ if (values_type == NULL)
+ values_type = default_return_type;
+ if (values_type == NULL)
+ {
+ const char *name = get_function_name (funaddr,
+ name_buf, sizeof (name_buf));
+ error (_("'%s' has unknown return type; "
+ "cast the call to its declared return type"),
+ name);
+ }

values_type = check_typedef (values_type);

diff --git a/gdb/infcall.h b/gdb/infcall.h
index cbaa943..a456d92 100644
--- a/gdb/infcall.h
+++ b/gdb/infcall.h
@@ -35,9 +35,15 @@ extern CORE_ADDR find_function_addr (struct value *function,
representing what the function returned. May fail to return, if a
breakpoint or signal is hit during the execution of the function.

+ DFEAULT_RETURN_TYPE is used as function return type if the return
+ type is unknown. This is used when calling functions with no debug
+ info.
+
ARGS is modified to contain coerced values. */

-extern struct value *call_function_by_hand (struct value *function, int nargs,
+extern struct value *call_function_by_hand (struct value *function,
+ type *default_return_type,
+ int nargs,
struct value **args);

/* Similar to call_function_by_hand and additional call
@@ -45,9 +51,18 @@ extern struct value *call_function_by_hand (struct value *function, int nargs,
created inferior call dummy frame. */

extern struct value *
- call_function_by_hand_dummy (struct value *function, int nargs,
+ call_function_by_hand_dummy (struct value *function,
+ type *default_return_type,
+ int nargs,
struct value **args,
dummy_frame_dtor_ftype *dummy_dtor,
void *dummy_dtor_data);

+/* Throw an error indicating that the user tried to call a function
+ that has unknown return type. FUNC_NAME is the name of the
+ function to be included in the error message; may be NULL, in which
+ case the error message doesn't include a function name. */
+
+extern void error_call_unknown_return_type (const char *func_name);
+
#endif
diff --git a/gdb/linux-fork.c b/gdb/linux-fork.c
index 573a3e9..16403c9 100644
--- a/gdb/linux-fork.c
+++ b/gdb/linux-fork.c
@@ -248,7 +248,7 @@ call_lseek (int fd, off_t offset, int whence)
{
char exp[80];

- snprintf (&exp[0], sizeof (exp), "lseek (%d, %ld, %d)",
+ snprintf (&exp[0], sizeof (exp), "(long) lseek (%d, %ld, %d)",
fd, (long) offset, whence);
return (off_t) parse_and_eval_long (&exp[0]);
}
@@ -492,7 +492,7 @@ inferior_call_waitpid (ptid_t pptid, int pid)
argv[2] = value_from_longest (builtin_type (gdbarch)->builtin_int, 0);
argv[3] = 0;

- retv = call_function_by_hand (waitpid_fn, 3, argv);
+ retv = call_function_by_hand (waitpid_fn, NULL, 3, argv);
if (value_as_long (retv) < 0)
goto out;

@@ -707,7 +707,7 @@ checkpoint_command (char *args, int from_tty)
scoped_restore save_pid
= make_scoped_restore (&checkpointing_pid, ptid_get_pid (inferior_ptid));

- ret = call_function_by_hand (fork_fn, 0, &ret);
+ ret = call_function_by_hand (fork_fn, NULL, 0, &ret);
}

if (!ret) /* Probably can't happen. */
diff --git a/gdb/linux-tdep.c b/gdb/linux-tdep.c
index 2792cbd..37dd95e 100644
--- a/gdb/linux-tdep.c
+++ b/gdb/linux-tdep.c
@@ -2427,7 +2427,7 @@ linux_infcall_mmap (CORE_ADDR size, unsigned prot)
arg[ARG_FD] = value_from_longest (builtin_type (gdbarch)->builtin_int, -1);
arg[ARG_OFFSET] = value_from_longest (builtin_type (gdbarch)->builtin_int64,
0);
- addr_val = call_function_by_hand (mmap_val, ARG_LAST, arg);
+ addr_val = call_function_by_hand (mmap_val, NULL, ARG_LAST, arg);
retval = value_as_address (addr_val);
if (retval == (CORE_ADDR) -1)
error (_("Failed inferior mmap call for %s bytes, errno is changed."),
@@ -2456,7 +2456,7 @@ linux_infcall_munmap (CORE_ADDR addr, CORE_ADDR size)
/* Assuming sizeof (unsigned long) == sizeof (size_t). */
arg[ARG_LENGTH] = value_from_ulongest
(builtin_type (gdbarch)->builtin_unsigned_long, size);
- retval_val = call_function_by_hand (munmap_val, ARG_LAST, arg);
+ retval_val = call_function_by_hand (munmap_val, NULL, ARG_LAST, arg);
retval = value_as_long (retval_val);
if (retval != 0)
warning (_("Failed inferior munmap call at %s for %s bytes, "
diff --git a/gdb/m2-typeprint.c b/gdb/m2-typeprint.c
index 4cf1569..0dd6f19 100644
--- a/gdb/m2-typeprint.c
+++ b/gdb/m2-typeprint.c
@@ -280,7 +280,8 @@ m2_procedure (struct type *type, struct ui_file *stream,
{
fprintf_filtered (stream, "PROCEDURE ");
m2_type_name (type, stream);
- if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_VOID)
+ if (TYPE_TARGET_TYPE (type) == NULL
+ || TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_VOID)
{
int i, len = TYPE_NFIELDS (type);

@@ -294,11 +295,11 @@ m2_procedure (struct type *type, struct ui_file *stream,
}
m2_print_type (TYPE_FIELD_TYPE (type, i), "", stream, -1, 0, flags);
}
+ fprintf_filtered (stream, ") : ");
if (TYPE_TARGET_TYPE (type) != NULL)
- {
- fprintf_filtered (stream, " : ");
- m2_print_type (TYPE_TARGET_TYPE (type), "", stream, 0, 0, flags);
- }
+ m2_print_type (TYPE_TARGET_TYPE (type), "", stream, 0, 0, flags);
+ else
+ type_print_unknown_return_type (stream);
}
}

diff --git a/gdb/objc-lang.c b/gdb/objc-lang.c
index 934d9c6..fbdd69f 100644
--- a/gdb/objc-lang.c
+++ b/gdb/objc-lang.c
@@ -130,7 +130,8 @@ lookup_objc_class (struct gdbarch *gdbarch, const char *classname)

classval = value_string (classname, strlen (classname) + 1, char_type);
classval = value_coerce_array (classval);
- return (CORE_ADDR) value_as_long (call_function_by_hand (function,
+ return (CORE_ADDR) value_as_long (call_function_by_hand (function,
+ NULL,
1, &classval));
}

@@ -160,7 +161,7 @@ lookup_child_selector (struct gdbarch *gdbarch, const char *selname)
selstring = value_coerce_array (value_string (selname,
strlen (selname) + 1,
char_type));
- return value_as_long (call_function_by_hand (function, 1, &selstring));
+ return value_as_long (call_function_by_hand (function, NULL, 1, &selstring));
}

struct value *
@@ -181,12 +182,13 @@ value_nsstring (struct gdbarch *gdbarch, char *ptr, int len)
if (lookup_minimal_symbol("_NSNewStringFromCString", 0, 0).minsym)
{
function = find_function_in_inferior("_NSNewStringFromCString", NULL);
- nsstringValue = call_function_by_hand(function, 1, &stringValue[2]);
+ nsstringValue = call_function_by_hand(function,
+ NULL, 1, &stringValue[2]);
}
else if (lookup_minimal_symbol("istr", 0, 0).minsym)
{
function = find_function_in_inferior("istr", NULL);
- nsstringValue = call_function_by_hand(function, 1, &stringValue[2]);
+ nsstringValue = call_function_by_hand(function, NULL, 1, &stringValue[2]);
}
else if (lookup_minimal_symbol("+[NSString stringWithCString:]", 0, 0).minsym)
{
@@ -198,7 +200,7 @@ value_nsstring (struct gdbarch *gdbarch, char *ptr, int len)
(type, lookup_objc_class (gdbarch, "NSString"));
stringValue[1] = value_from_longest
(type, lookup_child_selector (gdbarch, "stringWithCString:"));
- nsstringValue = call_function_by_hand(function, 3, &stringValue[0]);
+ nsstringValue = call_function_by_hand(function, NULL, 3, &stringValue[0]);
}
else
error (_("NSString: internal error -- no way to create new NSString"));
@@ -1209,7 +1211,7 @@ print_object_command (char *args, int from_tty)
if (function == NULL)
error (_("Unable to locate _NSPrintForDebugger in child process"));

- description = call_function_by_hand (function, 1, &object);
+ description = call_function_by_hand (function, NULL, 1, &object);

string_addr = value_as_long (description);
if (string_addr == 0)
diff --git a/gdb/p-typeprint.c b/gdb/p-typeprint.c
index d08f6f7..33b4992 100644
--- a/gdb/p-typeprint.c
+++ b/gdb/p-typeprint.c
@@ -227,7 +227,8 @@ pascal_type_print_varspec_prefix (struct type *type, struct ui_file *stream,
case TYPE_CODE_METHOD:
if (passed_a_ptr)
fprintf_filtered (stream, "(");
- if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_VOID)
+ if (TYPE_TARGET_TYPE (type) != NULL
+ && TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_VOID)
{
fprintf_filtered (stream, "function ");
}
@@ -255,7 +256,8 @@ pascal_type_print_varspec_prefix (struct type *type, struct ui_file *stream,
if (passed_a_ptr)
fprintf_filtered (stream, "(");

- if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_VOID)
+ if (TYPE_TARGET_TYPE (type) != NULL
+ && TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_VOID)
{
fprintf_filtered (stream, "function ");
}
@@ -334,6 +336,33 @@ pascal_print_func_args (struct type *type, struct ui_file *stream,
}
}

+/* Helper for pascal_type_print_varspec_suffix to print the suffix of
+ a function or method. */
+
+static void
+pascal_type_print_func_varspec_suffix (struct type *type, struct ui_file *stream,
+ int show, int passed_a_ptr,
+ int demangled_args,
+ const struct type_print_options *flags)
+{
+ if (TYPE_TARGET_TYPE (type) == NULL
+ || TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_VOID)
+ {
+ fprintf_filtered (stream, " : ");
+ pascal_type_print_varspec_prefix (TYPE_TARGET_TYPE (type),
+ stream, 0, 0, flags);
+
+ if (TYPE_TARGET_TYPE (type) == NULL)
+ type_print_unknown_return_type (stream);
+ else
+ pascal_type_print_base (TYPE_TARGET_TYPE (type), stream, show, 0,
+ flags);
+
+ pascal_type_print_varspec_suffix (TYPE_TARGET_TYPE (type), stream, 0,
+ passed_a_ptr, 0, flags);
+ }
+}
+
/* Print any array sizes, function arguments or close parentheses
needed after the variable name (to describe its type).
Args work like pascal_type_print_varspec_prefix. */
@@ -365,16 +394,8 @@ pascal_type_print_varspec_suffix (struct type *type, struct ui_file *stream,
pascal_type_print_method_args ("",
"",
stream);
- if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_VOID)
- {
- fprintf_filtered (stream, " : ");
- pascal_type_print_varspec_prefix (TYPE_TARGET_TYPE (type),
- stream, 0, 0, flags);
- pascal_type_print_base (TYPE_TARGET_TYPE (type), stream, show, 0,
- flags);
- pascal_type_print_varspec_suffix (TYPE_TARGET_TYPE (type), stream, 0,
- passed_a_ptr, 0, flags);
- }
+ pascal_type_print_func_varspec_suffix (type, stream, show,
+ passed_a_ptr, 0, flags);
break;

case TYPE_CODE_PTR:
@@ -388,16 +409,8 @@ pascal_type_print_varspec_suffix (struct type *type, struct ui_file *stream,
fprintf_filtered (stream, ")");
if (!demangled_args)
pascal_print_func_args (type, stream, flags);
- if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_VOID)
- {
- fprintf_filtered (stream, " : ");
- pascal_type_print_varspec_prefix (TYPE_TARGET_TYPE (type),
- stream, 0, 0, flags);
- pascal_type_print_base (TYPE_TARGET_TYPE (type), stream, show, 0,
- flags);
- pascal_type_print_varspec_suffix (TYPE_TARGET_TYPE (type), stream, 0,
- passed_a_ptr, 0, flags);
- }
+ pascal_type_print_func_varspec_suffix (type, stream, show,
+ passed_a_ptr, 0, flags);
break;

case TYPE_CODE_UNDEF:
diff --git a/gdb/python/py-value.c b/gdb/python/py-value.c
index b5a0ef8..cbbb936 100644
--- a/gdb/python/py-value.c
+++ b/gdb/python/py-value.c
@@ -925,7 +925,8 @@ valpy_call (PyObject *self, PyObject *args, PyObject *keywords)
scoped_value_mark free_values;
struct value *return_value;

- return_value = call_function_by_hand (function, args_count, vargs);
+ return_value = call_function_by_hand (function, NULL,
+ args_count, vargs);
result = value_to_value_object (return_value);
}
CATCH (except, RETURN_MASK_ALL)
diff --git a/gdb/rust-lang.c b/gdb/rust-lang.c
index d4cda1f..14e7f9b 100644
--- a/gdb/rust-lang.c
+++ b/gdb/rust-lang.c
@@ -1292,7 +1292,7 @@ rust_evaluate_funcall (struct expression *exp, int *pos, enum noside noside)
if (noside == EVAL_AVOID_SIDE_EFFECTS)
result = value_zero (TYPE_TARGET_TYPE (fn_type), not_lval);
else
- result = call_function_by_hand (function, num_args + 1, args.data ());
+ result = call_function_by_hand (function, NULL, num_args + 1, args.data ());
return result;
}

diff --git a/gdb/testsuite/gdb.base/break-main-file-remove-fail.exp b/gdb/testsuite/gdb.base/break-main-file-remove-fail.exp
index eba72bc..080d193 100644
--- a/gdb/testsuite/gdb.base/break-main-file-remove-fail.exp
+++ b/gdb/testsuite/gdb.base/break-main-file-remove-fail.exp
@@ -88,7 +88,7 @@ proc test_remove_bp { initial_load } {
# should warn the user about it.
set pagesize [get_integer_valueof "pg_size" 0]
set align_addr [expr $bp_addr - $bp_addr % $pagesize]
- set munmap [get_integer_valueof "munmap ($align_addr, $pagesize)" -1]
+ set munmap [get_integer_valueof "(int) munmap ($align_addr, $pagesize)" -1]

if {$munmap != 0} {
unsupported "can't munmap foo's page"
diff --git a/gdb/testsuite/gdb.base/break-probes.exp b/gdb/testsuite/gdb.base/break-probes.exp
index 929509a..318a219 100644
--- a/gdb/testsuite/gdb.base/break-probes.exp
+++ b/gdb/testsuite/gdb.base/break-probes.exp
@@ -86,5 +86,5 @@ if { $using_probes } {
}

# Call something to ensure that relocation occurred
- gdb_test "call foo(23)" "\\\$.* = 31.*\\\M.*"
+ gdb_test "call (int) foo(23)" "\\\$.* = 31.*\\\M.*"
}
diff --git a/gdb/testsuite/gdb.base/checkpoint.exp b/gdb/testsuite/gdb.base/checkpoint.exp
index 12c1d8a..677c389 100644
--- a/gdb/testsuite/gdb.base/checkpoint.exp
+++ b/gdb/testsuite/gdb.base/checkpoint.exp
@@ -224,45 +224,11 @@ gdb_test "shell diff $pi_txt $copy1_txt" \
delete_breakpoints
gdb_breakpoint $break2_loc

-gdb_test "restart 1" "if .c == EOF.*" "restart 1 three"
-gdb_test "continue" "breakpoint 2.*" "break2 1 one"
-gdb_test "print ftell (out) > 100000" " = 1.*" "outfile still open 1"
-
-gdb_test "restart 2" "if .c == EOF.*" "restart 2 three"
-gdb_test "continue" "breakpoint 2.*" "break2 2 one"
-gdb_test "print ftell (out) > 100000" " = 1.*" "outfile still open 2"
-
-gdb_test "restart 3" "if .c == EOF.*" "restart 3 three"
-gdb_test "continue" "breakpoint 2.*" "break2 3 one"
-gdb_test "print ftell (out) > 100000" " = 1.*" "outfile still open 3"
-
-gdb_test "restart 4" "if .c == EOF.*" "restart 4 three"
-gdb_test "continue" "breakpoint 2.*" "break2 4 one"
-gdb_test "print ftell (out) > 100000" " = 1.*" "outfile still open 4"
-
-gdb_test "restart 5" "if .c == EOF.*" "restart 5 three"
-gdb_test "continue" "breakpoint 2.*" "break2 5 one"
-gdb_test "print ftell (out) > 100000" " = 1.*" "outfile still open 5"
-
-gdb_test "restart 6" "if .c == EOF.*" "restart 6 three"
-gdb_test "continue" "breakpoint 2.*" "break2 6 one"
-gdb_test "print ftell (out) > 100000" " = 1.*" "outfile still open 6"
-
-gdb_test "restart 7" "if .c == EOF.*" "restart 7 three"
-gdb_test "continue" "breakpoint 2.*" "break2 7 one"
-gdb_test "print ftell (out) > 100000" " = 1.*" "outfile still open 7"
-
-gdb_test "restart 8" "if .c == EOF.*" "restart 8 three"
-gdb_test "continue" "breakpoint 2.*" "break2 8 one"
-gdb_test "print ftell (out) > 100000" " = 1.*" "outfile still open 8"
-
-gdb_test "restart 9" "if .c == EOF.*" "restart 9 three"
-gdb_test "continue" "breakpoint 2.*" "break2 9 one"
-gdb_test "print ftell (out) > 100000" " = 1.*" "outfile still open 9"
-
-gdb_test "restart 10" "if .c == EOF.*" "restart 10 three"
-gdb_test "continue" "breakpoint 2.*" "break2 10 one"
-gdb_test "print ftell (out) > 100000" " = 1.*" "outfile still open 10"
+for {set num 1} {$num <= 10} {incr num} {
+ gdb_test "restart $num" "if .c == EOF.*" "restart $num three"
+ gdb_test "continue" "breakpoint 2.*" "break2 $num one"
+ gdb_test "print (long) ftell (out) > 100000" " = 1.*" "outfile still open $num"
+}

#
# Now confirm that if one fork exits, we automatically switch to another one.
diff --git a/gdb/testsuite/gdb.base/dprintf-detach.exp b/gdb/testsuite/gdb.base/dprintf-detach.exp
index 4c6ef1c..940a9ef 100644
--- a/gdb/testsuite/gdb.base/dprintf-detach.exp
+++ b/gdb/testsuite/gdb.base/dprintf-detach.exp
@@ -53,7 +53,7 @@ proc dprintf_detach_test { breakpoint_always_inserted dprintf_style disconnected
# Get PID of test program.
set inferior_pid -1
set test "get inferior process ID"
- gdb_test_multiple "call getpid ()" $test {
+ gdb_test_multiple "call (int) getpid ()" $test {
-re ".* = ($decimal).*$gdb_prompt $" {
set inferior_pid $expect_out(1,string)
pass $test
diff --git a/gdb/testsuite/gdb.base/infcall-exec.exp b/gdb/testsuite/gdb.base/infcall-exec.exp
index 3984076..8419905 100644
--- a/gdb/testsuite/gdb.base/infcall-exec.exp
+++ b/gdb/testsuite/gdb.base/infcall-exec.exp
@@ -44,5 +44,5 @@ append expected_result "\[\r\n\]+.*"
append expected_result "Breakpoint 1, main .*at .*$srcfile2:$decimal"
append expected_result ".*"

-gdb_test "call execlp \(\"$binfile2\", \"$binfile2\", \(char \*\)0\)" \
+gdb_test "call (int) execlp \(\"$binfile2\", \"$binfile2\", \(char \*\)0\)" \
$expected_result "call execlp"
diff --git a/gdb/testsuite/gdb.base/info-os.exp b/gdb/testsuite/gdb.base/info-os.exp
index 0168ccb..574da26 100644
--- a/gdb/testsuite/gdb.base/info-os.exp
+++ b/gdb/testsuite/gdb.base/info-os.exp
@@ -39,14 +39,18 @@ if ![runto_main] then {
}

# Get PID of test program.
-set inferior_pid -1
+set inferior_pid ""
set test "get inferior process ID"
-gdb_test_multiple "call getpid()" $test {
+gdb_test_multiple "call (int) getpid()" $test {
-re ".* = ($decimal).*$gdb_prompt $" {
set inferior_pid $expect_out(1,string)
pass $test
}
}
+if {$inferior_pid == ""} {
+ untested "failed to get pid"
+ return
+}

gdb_breakpoint ${srcfile}:[gdb_get_line_number "Set breakpoint here"]
gdb_continue_to_breakpoint "Set breakpoint here"
diff --git a/gdb/testsuite/gdb.base/nodebug.exp b/gdb/testsuite/gdb.base/nodebug.exp
index a54e5bb..25dbf63 100644
--- a/gdb/testsuite/gdb.base/nodebug.exp
+++ b/gdb/testsuite/gdb.base/nodebug.exp
@@ -59,18 +59,61 @@ if [runto inner] then {
# out debugging info for non-aggregate return values of functions
# even without -g, which should be accepted.

- gdb_test "p top" \
- "\{(<(text variable|function), no debug info>|short \\(int\\)|short \\(\\))\} \[0-9a-fx]* <\\.?top(\\(int\\)|)>"
- gdb_test "whatis top" \
- "(<(text variable|function), no debug info>|short \\(int\\)|short \\(\\))"
- gdb_test "ptype top" "(short|int) \\((|void|int|<non-float parameter>|<non-float parameter>, <non-float parameter>)\\)"
-
- gdb_test "p middle" \
- "\{(<(text variable|function), no debug info>|short \\(int\\)|short \\(\\))\} \[0-9a-fx]* <\\.?middle(\\(int\\)|)>"
- gdb_test "whatis middle" \
- "(<(text variable|function), no debug info>|short \\(int\\)|short \\(\\))"
- gdb_test "ptype middle" "(short|int) \\((|void|int|<non-float parameter>|<non-float parameter>, <non-float parameter>)\\)"
-
+ with_test_prefix "func" {
+ # Most languages default to printing like C.
+ set c_print_re " = \\{<text variable, no debug info>\\} $hex <top>"
+ set c_whatis_re " = <text variable, no debug info>"
+ set c_ptype_re "= <unknown return type> \\(\\)"
+
+ set cxx_ptype_re "= <unknown return type> \\(void\\)"
+
+ set ada_ptype_re " = function return <unknown return type>"
+
+ set m2_print_re " = \\{PROCEDURE <text variable, no debug info> \\(\\) : <unknown return type>\\} $hex <top>"
+ set m2_whatis_re "PROCEDURE <text variable, no debug info> \\(\\) : <unknown return type>"
+ set m2_ptype_re $m2_whatis_re
+
+ # Rust can't access minsyms?
+ set rust_nosym "No symbol 'top' in current context"
+
+ set pascal_ptype_re "type = procedure : <unknown return type>"
+
+ #LANG #PRINT #WHATIS #PTYPE
+ foreach lang_line {
+ {"ada" $c_print_re $c_whatis_re $ada_ptype_re}
+ {"asm" $c_print_re $c_whatis_re $c_ptype_re}
+ {"c" $c_print_re $c_whatis_re $c_ptype_re}
+ {"c++" $c_print_re $c_whatis_re $cxx_ptype_re}
+ {"d" $c_print_re $c_whatis_re $c_ptype_re}
+ {"fortran" $c_print_re $c_whatis_re $c_ptype_re}
+ {"go" $c_print_re $c_whatis_re $c_ptype_re}
+ {"minimal" $c_print_re $c_whatis_re $c_ptype_re}
+ {"modula-2" $m2_print_re $m2_whatis_re $m2_ptype_re}
+ {"objective-c" $c_print_re $c_whatis_re $c_ptype_re}
+ {"opencl" $c_print_re $c_whatis_re $c_ptype_re}
+ {"pascal" $c_print_re $c_whatis_re $pascal_ptype_re}
+ {"rust" $rust_nosym $rust_nosym $rust_nosym}
+ } {
+ set lang [lindex $lang_line 0]
+ set print_re [lindex $lang_line 1]
+ set whatis_re [lindex $lang_line 2]
+ set ptype_re [lindex $lang_line 3]
+
+ set print_re [subst "$print_re"]
+ set whatis_re [subst "$whatis_re"]
+ set ptype_re [subst "$ptype_re"]
+
+ with_test_prefix "$lang" {
+ gdb_test_no_output "set language $lang"
+ gdb_test "p top" $print_re
+ gdb_test "whatis top" $whatis_re
+ gdb_test "ptype top" $ptype_re
+ }
+ }
+ }
+
+ gdb_test_no_output "set language auto"
+
gdb_test "p dataglobal" "= 3"
gdb_test "whatis dataglobal" \
"<(data variable|variable), no debug info>|int"
@@ -122,14 +165,22 @@ if [runto inner] then {

# This test is not as obscure as it might look. `p getenv ("TERM")'
# is a real-world example, at least on many systems.
+
+ gdb_test {p/c array_index("abcdef",2)} \
+ "'array_index' has unknown return type; cast the call to its declared return type"
+ gdb_test {ptype array_index("abcdef",2)} \
+ "function has unknown return type; cast the call to its declared return type"
+ gdb_test {whatis array_index("abcdef",2)} \
+ "function has unknown return type; cast the call to its declared return type"
+
if [target_info exists gdb,cannot_call_functions] {
- unsupported "p/c array_index(\"abcdef\",2)"
+ unsupported "p/c (int) array_index(\"abcdef\",2)"
} else {
# We need to up this because this can be really slow on some boards.
# (malloc() is called as part of the test).
set prev_timeout $timeout
set timeout 60
- gdb_test {p/c array_index("abcdef",2)} " = 99 'c'"
+ gdb_test {p/c (int) array_index("abcdef",2)} " = 99 'c'"
set timeout $prev_timeout
}

diff --git a/gdb/testsuite/gdb.compile/compile.exp b/gdb/testsuite/gdb.compile/compile.exp
index b221870..c23ff6a 100644
--- a/gdb/testsuite/gdb.compile/compile.exp
+++ b/gdb/testsuite/gdb.compile/compile.exp
@@ -296,12 +296,14 @@ gdb_test "p globalvar" " = 77" "expect 77"

# Test reference to minimal_symbol, not (full) symbol.

-gdb_test_no_output "compile code globalvar = func_nodebug (75);" \
+gdb_test "compile code globalvar = func_nodebug (75);" \
+ "warning: function has unknown return type; assuming int" \
"call func_nodebug"
gdb_test "p globalvar" " = -75" "expect -75"
-gdb_test_no_output \
- "compile code int (*funcp) (int) = func_nodebug; globalvar = funcp (76);" \
- "call func_nodebug indirectly"
+gdb_test \
+ "compile code int (*funcp) (int) = func_nodebug; globalvar = funcp (76);" \
+ "warning: function has unknown return type; assuming int" \
+ "call func_nodebug indirectly"
gdb_test "p globalvar" " = -76" "expect -76"

diff --git a/gdb/testsuite/gdb.threads/siginfo-threads.exp b/gdb/testsuite/gdb.threads/siginfo-threads.exp
index 328168c..8ee4c36 100644
--- a/gdb/testsuite/gdb.threads/siginfo-threads.exp
+++ b/gdb/testsuite/gdb.threads/siginfo-threads.exp
@@ -40,12 +40,17 @@ gdb_test "handle SIGUSR2 stop print pass" \
gdb_breakpoint [gdb_get_line_number "break-at-exit"]

set test "get pid"
-gdb_test_multiple "p getpid ()" $test {
+set pid ""
+gdb_test_multiple "p (int) getpid ()" $test {
-re " = (\[0-9\]+)\r\n$gdb_prompt $" {
set pid $expect_out(1,string)
pass $test
}
}
+if {$pid == ""} {
+ untested "failed to get pid"
+ return
+}

for {set sigcount 0} {$sigcount < 4} {incr sigcount} {
set test "catch signal $sigcount"
diff --git a/gdb/typeprint.c b/gdb/typeprint.c
index 045271a..8e58bf9 100644
--- a/gdb/typeprint.c
+++ b/gdb/typeprint.c
@@ -386,6 +386,14 @@ type_to_string (struct type *type)
return {};
}

+/* See typeprint.h. */
+
+void
+type_print_unknown_return_type (struct ui_file *stream)
+{
+ fprintf_filtered (stream, _("<unknown return type>"));
+}
+
/* Print type of EXP, or last thing in value history if EXP == NULL.
show is passed to type_print. */

@@ -757,4 +765,3 @@ val_print_not_associated (struct ui_file *stream)
{
fprintf_filtered (stream, _("<not associated>"));
}
-
diff --git a/gdb/typeprint.h b/gdb/typeprint.h
index 72da7f4..d4e19e5b 100644
--- a/gdb/typeprint.h
+++ b/gdb/typeprint.h
@@ -74,6 +74,10 @@ void c_type_print_varspec_suffix (struct type *, struct ui_file *, int,
void c_type_print_args (struct type *, struct ui_file *, int, enum language,
const struct type_print_options *);

+/* Print <unknown return type> to stream STREAM. */
+
+void type_print_unknown_return_type (struct ui_file *stream);
+
extern void val_print_not_allocated (struct ui_file *stream);

extern void val_print_not_associated (struct ui_file *stream);
diff --git a/gdb/valarith.c b/gdb/valarith.c
index 985233c..6c765df 100644
--- a/gdb/valarith.c
+++ b/gdb/valarith.c
@@ -505,7 +505,7 @@ value_x_binop (struct value *arg1, struct value *arg2, enum exp_opcode op,
= TYPE_TARGET_TYPE (check_typedef (value_type (argvec[0])));
return value_zero (return_type, VALUE_LVAL (arg1));
}
- return call_function_by_hand (argvec[0], 2 - static_memfuncp,
+ return call_function_by_hand (argvec[0], NULL, 2 - static_memfuncp,
argvec + 1);
}
throw_error (NOT_FOUND_ERROR,
@@ -624,7 +624,7 @@ value_x_unop (struct value *arg1, enum exp_opcode op, enum noside noside)
= TYPE_TARGET_TYPE (check_typedef (value_type (argvec[0])));
return value_zero (return_type, VALUE_LVAL (arg1));
}
- return call_function_by_hand (argvec[0], nargs, argvec + 1);
+ return call_function_by_hand (argvec[0], NULL, nargs, argvec + 1);
}
throw_error (NOT_FOUND_ERROR,
_("member function %s not found"), tstr);
diff --git a/gdb/valops.c b/gdb/valops.c
index f3f5308..66678e5 100644
--- a/gdb/valops.c
+++ b/gdb/valops.c
@@ -191,7 +191,7 @@ value_allocate_space_in_inferior (int len)
struct value *blocklen;

blocklen = value_from_longest (builtin_type (gdbarch)->builtin_int, len);
- val = call_function_by_hand (val, 1, &blocklen);
+ val = call_function_by_hand (val, NULL, 1, &blocklen);
if (value_logical_not (val))
{
if (!target_has_execution)
--
2.5.5