/* Perform an inferior function call, for GDB, the GNU debugger.
- Copyright (C) 1986-2012 Free Software Foundation, Inc.
+ Copyright (C) 1986-2015 Free Software Foundation, Inc.
This file is part of GDB.
#include "target.h"
#include "regcache.h"
#include "inferior.h"
-#include "gdb_assert.h"
+#include "infrun.h"
#include "block.h"
#include "gdbcore.h"
#include "language.h"
#include "objfiles.h"
#include "gdbcmd.h"
#include "command.h"
-#include "gdb_string.h"
#include "infcall.h"
#include "dummy-frame.h"
#include "ada-lang.h"
#include "gdbthread.h"
-#include "exceptions.h"
+#include "event-top.h"
+#include "observer.h"
/* If we can't find a function's name from its address,
we print this instead. */
struct value *new_value;
if (TYPE_CODE (arg_type) == TYPE_CODE_REF)
- return value_cast_pointers (type, arg);
+ return value_cast_pointers (type, arg, 0);
/* Cast the value to the reference's target type, and then
convert it back to a reference. This will issue an error
case TYPE_CODE_SET:
case TYPE_CODE_RANGE:
case TYPE_CODE_STRING:
- case TYPE_CODE_BITSTRING:
case TYPE_CODE_ERROR:
case TYPE_CODE_MEMBERPTR:
case TYPE_CODE_METHODPTR:
{
/* Try the minimal symbols. */
- struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (funaddr);
+ struct bound_minimal_symbol msymbol = lookup_minimal_symbol_by_pc (funaddr);
- if (msymbol)
- return SYMBOL_PRINT_NAME (msymbol);
+ if (msymbol.minsym)
+ return MSYMBOL_PRINT_NAME (msymbol.minsym);
}
{
static struct gdb_exception
run_inferior_call (struct thread_info *call_thread, CORE_ADDR real_pc)
{
- volatile struct gdb_exception e;
+ struct gdb_exception caught_error = exception_none;
int saved_in_infcall = call_thread->control.in_infcall;
ptid_t call_thread_ptid = call_thread->ptid;
+ int saved_sync_execution = sync_execution;
+
+ /* Infcalls run synchronously, in the foreground. */
+ if (target_can_async_p ())
+ sync_execution = 1;
call_thread->control.in_infcall = 1;
- clear_proceed_status ();
+ clear_proceed_status (0);
disable_watchpoints_before_interactive_call_start ();
/* We want stop_registers, please... */
call_thread->control.proceed_to_finish = 1;
- TRY_CATCH (e, RETURN_MASK_ALL)
+ TRY
{
- proceed (real_pc, TARGET_SIGNAL_0, 0);
+ int was_sync = sync_execution;
+
+ proceed (real_pc, GDB_SIGNAL_0);
/* Inferior function calls are always synchronous, even if the
target supports asynchronous execution. Do here what
`proceed' itself does in sync mode. */
- if (target_can_async_p () && is_running (inferior_ptid))
+ if (target_can_async_p ())
{
wait_for_inferior ();
normal_stop ();
+ /* If GDB was previously in sync execution mode, then ensure
+ that it remains so. normal_stop calls
+ async_enable_stdin, so reset it again here. In other
+ cases, stdin will be re-enabled by
+ inferior_event_handler, when an exception is thrown. */
+ if (was_sync)
+ async_disable_stdin ();
}
}
+ CATCH (e, RETURN_MASK_ALL)
+ {
+ caught_error = e;
+ }
+ END_CATCH
/* At this point the current thread may have changed. Refresh
CALL_THREAD as it could be invalid if its thread has exited. */
If all error()s out of proceed ended up calling normal_stop
(and perhaps they should; it already does in the special case
of error out of resume()), then we wouldn't need this. */
- if (e.reason < 0)
+ if (caught_error.reason < 0)
{
if (call_thread != NULL)
breakpoint_auto_delete (call_thread->control.stop_bpstat);
if (call_thread != NULL)
call_thread->control.in_infcall = saved_in_infcall;
- return e;
+ sync_execution = saved_sync_execution;
+
+ return caught_error;
}
/* A cleanup function that calls delete_std_terminate_breakpoint. */
delete_std_terminate_breakpoint ();
}
+/* See infcall.h. */
+
+struct value *
+call_function_by_hand (struct value *function, int nargs, struct value **args)
+{
+ return call_function_by_hand_dummy (function, nargs, args, NULL, NULL);
+}
+
/* All this stuff with a dummy frame may seem unnecessarily complicated
(why not just save registers in GDB?). The purpose of pushing a dummy
frame which looks just like a real frame is so that if you call a
ARGS is modified to contain coerced values. */
struct value *
-call_function_by_hand (struct value *function, int nargs, struct value **args)
+call_function_by_hand_dummy (struct value *function,
+ int nargs, struct value **args,
+ call_function_by_hand_dummy_dtor_ftype *dummy_dtor,
+ void *dummy_dtor_data)
{
CORE_ADDR sp;
struct type *values_type, *target_values_type;
- unsigned char struct_return = 0, lang_struct_return = 0;
+ unsigned char struct_return = 0, hidden_first_param_p = 0;
CORE_ADDR struct_addr = 0;
struct infcall_control_state *inf_status;
struct cleanup *inf_status_cleanup;
ptid_t call_thread_ptid;
struct gdb_exception e;
char name_buf[RAW_FUNCTION_ADDRESS_SIZE];
+ int stack_temporaries = thread_stack_temporaries_enabled_p (inferior_ptid);
if (TYPE_CODE (ftype) == TYPE_CODE_PTR)
ftype = check_typedef (TYPE_TARGET_TYPE (ftype));
If the ABI specifies a "Red Zone" (see the doco) the code
below will quietly trash it. */
sp = old_sp;
+
+ /* Skip over the stack temporaries that might have been generated during
+ the evaluation of an expression. */
+ if (stack_temporaries)
+ {
+ struct value *lastval;
+
+ lastval = get_last_thread_stack_temporary (inferior_ptid);
+ if (lastval != NULL)
+ {
+ CORE_ADDR lastval_addr = value_address (lastval);
+
+ if (gdbarch_inner_than (gdbarch, 1, 2))
+ {
+ gdb_assert (sp >= lastval_addr);
+ sp = lastval_addr;
+ }
+ else
+ {
+ gdb_assert (sp <= lastval_addr);
+ sp = lastval_addr + TYPE_LENGTH (value_type (lastval));
+ }
+
+ if (gdbarch_frame_align_p (gdbarch))
+ sp = gdbarch_frame_align (gdbarch, sp);
+ }
+ }
}
funaddr = find_function_addr (function, &values_type);
the first argument is passed in out0 but the hidden structure
return pointer would normally be passed in r8. */
- if (language_pass_by_reference (values_type))
+ if (gdbarch_return_in_first_hidden_param_p (gdbarch, values_type))
{
- lang_struct_return = 1;
+ hidden_first_param_p = 1;
/* Tell the target specific argument pushing routine not to
expect a value. */
target_values_type = values_type;
}
+ observer_notify_inferior_call_pre (inferior_ptid, funaddr);
+
/* Determine the location of the breakpoint (and possibly other
stuff) that the called function will return to. The SPARC, for a
function returning a structure or union, needs to make space for
not just the breakpoint but also an extra word containing the
size (?) of the structure being passed. */
- /* The actual breakpoint (at BP_ADDR) is inserted separatly so there
- is no need to write that out. */
-
switch (gdbarch_call_dummy_location (gdbarch))
{
case ON_STACK:
- sp = push_dummy_code (gdbarch, sp, funaddr,
- args, nargs, target_values_type,
- &real_pc, &bp_addr, get_current_regcache ());
+ {
+ const gdb_byte *bp_bytes;
+ CORE_ADDR bp_addr_as_address;
+ int bp_size;
+
+ /* Be careful BP_ADDR is in inferior PC encoding while
+ BP_ADDR_AS_ADDRESS is a plain memory address. */
+
+ sp = push_dummy_code (gdbarch, sp, funaddr, args, nargs,
+ target_values_type, &real_pc, &bp_addr,
+ get_current_regcache ());
+
+ /* Write a legitimate instruction at the point where the infcall
+ breakpoint is going to be inserted. While this instruction
+ is never going to be executed, a user investigating the
+ memory from GDB would see this instruction instead of random
+ uninitialized bytes. We chose the breakpoint instruction
+ as it may look as the most logical one to the user and also
+ valgrind 3.7.0 needs it for proper vgdb inferior calls.
+
+ If software breakpoints are unsupported for this target we
+ leave the user visible memory content uninitialized. */
+
+ bp_addr_as_address = bp_addr;
+ bp_bytes = gdbarch_breakpoint_from_pc (gdbarch, &bp_addr_as_address,
+ &bp_size);
+ if (bp_bytes != NULL)
+ write_memory (bp_addr_as_address, bp_bytes, bp_size);
+ }
break;
case AT_ENTRY_POINT:
{
real_pc = funaddr;
dummy_addr = entry_point_address ();
+
/* A call dummy always consists of just a single breakpoint, so
- its address is the same as the address of the dummy. */
+ its address is the same as the address of the dummy.
+
+ The actual breakpoint is inserted separatly so there is no need to
+ write that out. */
bp_addr = dummy_addr;
break;
}
/* Reserve space for the return structure to be written on the
stack, if necessary. Make certain that the value is correctly
- aligned. */
+ aligned.
- if (struct_return || lang_struct_return)
- {
- int len = TYPE_LENGTH (values_type);
+ While evaluating expressions, we reserve space on the stack for
+ return values of class type even if the language ABI and the target
+ ABI do not require that the return value be passed as a hidden first
+ argument. This is because we want to store the return value as an
+ on-stack temporary while the expression is being evaluated. This
+ enables us to have chained function calls in expressions.
+
+ Keeping the return values as on-stack temporaries while the expression
+ is being evaluated is OK because the thread is stopped until the
+ expression is completely evaluated. */
+ if (struct_return || hidden_first_param_p
+ || (stack_temporaries && class_or_union_p (values_type)))
+ {
if (gdbarch_inner_than (gdbarch, 1, 2))
{
/* Stack grows downward. Align STRUCT_ADDR and SP after
making space for the return value. */
- sp -= len;
+ sp -= TYPE_LENGTH (values_type);
if (gdbarch_frame_align_p (gdbarch))
sp = gdbarch_frame_align (gdbarch, sp);
struct_addr = sp;
if (gdbarch_frame_align_p (gdbarch))
sp = gdbarch_frame_align (gdbarch, sp);
struct_addr = sp;
- sp += len;
+ sp += TYPE_LENGTH (values_type);
if (gdbarch_frame_align_p (gdbarch))
sp = gdbarch_frame_align (gdbarch, sp);
}
}
- if (lang_struct_return)
+ if (hidden_first_param_p)
{
struct value **new_args;
inferior. That way it breaks when it returns. */
{
- struct breakpoint *bpt;
+ struct breakpoint *bpt, *longjmp_b;
struct symtab_and_line sal;
init_sal (&sal); /* initialize to zeroes */
frame = NULL;
bpt->disposition = disp_del;
+ gdb_assert (bpt->related_breakpoint == bpt);
+
+ longjmp_b = set_longjmp_breakpoint_for_call_dummy ();
+ if (longjmp_b)
+ {
+ /* Link BPT into the chain of LONGJMP_B. */
+ bpt->related_breakpoint = longjmp_b;
+ while (longjmp_b->related_breakpoint != bpt->related_breakpoint)
+ longjmp_b = longjmp_b->related_breakpoint;
+ longjmp_b->related_breakpoint = bpt;
+ }
}
/* Create a breakpoint in std::terminate.
/* Everything's ready, push all the info needed to restore the
caller (and identify the dummy-frame) onto the dummy-frame
stack. */
- dummy_frame_push (caller_state, &dummy_id);
+ dummy_frame_push (caller_state, &dummy_id, inferior_ptid);
+ if (dummy_dtor != NULL)
+ register_dummy_frame_dtor (dummy_id, inferior_ptid,
+ dummy_dtor, dummy_dtor_data);
/* Discard both inf_status and caller_state cleanups.
From this point on we explicitly restore the associated state
e = run_inferior_call (tp, real_pc);
}
+ observer_notify_inferior_call_post (call_thread_ptid, funaddr);
+
/* Rethrow an error if we got one trying to run the inferior. */
if (e.reason < 0)
/* We must get back to the frame we were before the
dummy call. */
- dummy_frame_pop (dummy_id);
+ dummy_frame_pop (dummy_id, call_thread_ptid);
/* We also need to restore inferior status to that before the
dummy call. */
{
/* We must get back to the frame we were before the dummy
call. */
- dummy_frame_pop (dummy_id);
+ dummy_frame_pop (dummy_id, call_thread_ptid);
/* We also need to restore inferior status to that before
the dummy call. */
At this stage, leave the RETBUF alone. */
restore_infcall_control_state (inf_status);
- /* Figure out the value returned by the function. */
- retval = allocate_value (values_type);
-
- if (lang_struct_return)
- read_value_memory (retval, 0, 1, struct_addr,
- value_contents_raw (retval),
- TYPE_LENGTH (values_type));
- else if (TYPE_CODE (target_values_type) != TYPE_CODE_VOID)
+ if (TYPE_CODE (values_type) == TYPE_CODE_VOID)
+ retval = allocate_value (values_type);
+ else if (struct_return || hidden_first_param_p)
{
- /* If the function returns void, don't bother fetching the
- return value. */
- switch (gdbarch_return_value (gdbarch, function, target_values_type,
- NULL, NULL, NULL))
+ if (stack_temporaries)
+ {
+ retval = value_from_contents_and_address (values_type, NULL,
+ struct_addr);
+ push_thread_stack_temporary (inferior_ptid, retval);
+ }
+ else
{
- case RETURN_VALUE_REGISTER_CONVENTION:
- case RETURN_VALUE_ABI_RETURNS_ADDRESS:
- case RETURN_VALUE_ABI_PRESERVES_ADDRESS:
- gdbarch_return_value (gdbarch, function, values_type,
- retbuf, value_contents_raw (retval), NULL);
- break;
- case RETURN_VALUE_STRUCT_CONVENTION:
+ retval = allocate_value (values_type);
read_value_memory (retval, 0, 1, struct_addr,
value_contents_raw (retval),
TYPE_LENGTH (values_type));
- break;
+ }
+ }
+ else
+ {
+ retval = allocate_value (values_type);
+ gdbarch_return_value (gdbarch, function, values_type,
+ retbuf, value_contents_raw (retval), NULL);
+ if (stack_temporaries && class_or_union_p (values_type))
+ {
+ /* Values of class type returned in registers are copied onto
+ the stack and their lval_type set to lval_memory. This is
+ required because further evaluation of the expression
+ could potentially invoke methods on the return value
+ requiring GDB to evaluate the "this" pointer. To evaluate
+ the this pointer, GDB needs the memory address of the
+ value. */
+ value_force_lval (retval, struct_addr);
+ push_thread_stack_temporary (inferior_ptid, retval);
}
}
projects / deliverable / binutils-gdb.git / blobdiff