/* Perform an inferior function call, for GDB, the GNU debugger.
- Copyright (C) 1986-2019 Free Software Foundation, Inc.
+ Copyright (C) 1986-2020 Free Software Foundation, Inc.
This file is part of GDB.
#include "thread-fsm.h"
#include <algorithm>
#include "gdbsupport/scope-exit.h"
+#include <list>
/* If we can't find a function's name from its address,
we print this instead. */
struct symbol *symbol = find_pc_function (funaddr);
if (symbol)
- return SYMBOL_PRINT_NAME (symbol);
+ return symbol->print_name ();
}
{
struct bound_minimal_symbol msymbol = lookup_minimal_symbol_by_pc (funaddr);
if (msymbol.minsym)
- return MSYMBOL_PRINT_NAME (msymbol.minsym);
+ return msymbol.minsym->print_name ();
}
{
return caught_error;
}
+/* Reserve space on the stack for a value of the given type.
+ Return the address of the allocated space.
+ Make certain that the value is correctly aligned.
+ The SP argument is modified. */
+
+static CORE_ADDR
+reserve_stack_space (const type *values_type, CORE_ADDR &sp)
+{
+ struct frame_info *frame = get_current_frame ();
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ CORE_ADDR addr = 0;
+
+ if (gdbarch_inner_than (gdbarch, 1, 2))
+ {
+ /* Stack grows downward. Align STRUCT_ADDR and SP after
+ making space. */
+ sp -= TYPE_LENGTH (values_type);
+ if (gdbarch_frame_align_p (gdbarch))
+ sp = gdbarch_frame_align (gdbarch, sp);
+ addr = sp;
+ }
+ else
+ {
+ /* Stack grows upward. Align the frame, allocate space, and
+ then again, re-align the frame??? */
+ if (gdbarch_frame_align_p (gdbarch))
+ sp = gdbarch_frame_align (gdbarch, sp);
+ addr = sp;
+ sp += TYPE_LENGTH (values_type);
+ if (gdbarch_frame_align_p (gdbarch))
+ sp = gdbarch_frame_align (gdbarch, sp);
+ }
+
+ return addr;
+}
+
+/* The data structure which keeps a destructor function and
+ its implicit 'this' parameter. */
+
+struct destructor_info
+{
+ destructor_info (struct value *function, struct value *self)
+ : function (function), self (self) { }
+
+ struct value *function;
+ struct value *self;
+};
+
+
+/* Auxiliary function that takes a list of destructor functions
+ with their 'this' parameters, and invokes the functions. */
+
+static void
+call_destructors (const std::list<destructor_info> &dtors_to_invoke,
+ struct type *default_return_type)
+{
+ for (auto vals : dtors_to_invoke)
+ {
+ call_function_by_hand (vals.function, default_return_type,
+ gdb::make_array_view (&(vals.self), 1));
+ }
+}
+
/* See infcall.h. */
struct value *
making dummy frames be different from normal frames, consider that. */
/* Perform a function call in the inferior.
- ARGS is a vector of values of arguments (NARGS of them).
+ ARGS is a vector of values of arguments.
FUNCTION is a value, the function to be called.
Returns a value representing what the function returned.
May fail to return, if a breakpoint or signal is hit
void parameterless generic dummy frame calls to frameless
functions will create a sequence of effectively identical
frames (SP, FP and TOS and PC the same). This, not
- suprisingly, results in what appears to be a stack in an
+ surprisingly, results in what appears to be a stack in an
infinite loop --- when GDB tries to find a generic dummy
frame on the internal dummy frame stack, it will always
find the first one.
internal_error (__FILE__, __LINE__, _("bad switch"));
}
+ /* Coerce the arguments and handle pass-by-reference.
+ We want to remember the destruction required for pass-by-ref values.
+ For these, store the dtor function and the 'this' argument
+ in DTORS_TO_INVOKE. */
+ std::list<destructor_info> dtors_to_invoke;
+
for (int i = args.size () - 1; i >= 0; i--)
{
int prototyped;
else
param_type = NULL;
+ value *original_arg = args[i];
args[i] = value_arg_coerce (gdbarch, args[i],
param_type, prototyped);
- if (param_type != NULL && language_pass_by_reference (param_type))
- args[i] = value_addr (args[i]);
+ if (param_type == NULL)
+ continue;
+
+ auto info = language_pass_by_reference (param_type);
+ if (!info.copy_constructible)
+ error (_("expression cannot be evaluated because the type '%s' "
+ "is not copy constructible"), TYPE_NAME (param_type));
+
+ if (!info.destructible)
+ error (_("expression cannot be evaluated because the type '%s' "
+ "is not destructible"), TYPE_NAME (param_type));
+
+ if (info.trivially_copyable)
+ continue;
+
+ /* Make a copy of the argument on the stack. If the argument is
+ trivially copy ctor'able, copy bit by bit. Otherwise, call
+ the copy ctor to initialize the clone. */
+ CORE_ADDR addr = reserve_stack_space (param_type, sp);
+ value *clone
+ = value_from_contents_and_address (param_type, nullptr, addr);
+ push_thread_stack_temporary (call_thread.get (), clone);
+ value *clone_ptr
+ = value_from_pointer (lookup_pointer_type (param_type), addr);
+
+ if (info.trivially_copy_constructible)
+ {
+ int length = TYPE_LENGTH (param_type);
+ write_memory (addr, value_contents (args[i]), length);
+ }
+ else
+ {
+ value *copy_ctor;
+ value *cctor_args[2] = { clone_ptr, original_arg };
+ find_overload_match (gdb::make_array_view (cctor_args, 2),
+ TYPE_NAME (param_type), METHOD,
+ &clone_ptr, nullptr, ©_ctor, nullptr,
+ nullptr, 0, EVAL_NORMAL);
+
+ if (copy_ctor == nullptr)
+ error (_("expression cannot be evaluated because a copy "
+ "constructor for the type '%s' could not be found "
+ "(maybe inlined?)"), TYPE_NAME (param_type));
+
+ call_function_by_hand (copy_ctor, default_return_type,
+ gdb::make_array_view (cctor_args, 2));
+ }
+
+ /* If the argument has a destructor, remember it so that we
+ invoke it after the infcall is complete. */
+ if (!info.trivially_destructible)
+ {
+ /* Looking up the function via overload resolution does not
+ work because the compiler (in particular, gcc) adds an
+ artificial int parameter in some cases. So we look up
+ the function by using the "~" name. This should be OK
+ because there can be only one dtor definition. */
+ const char *dtor_name = nullptr;
+ for (int fieldnum = 0;
+ fieldnum < TYPE_NFN_FIELDS (param_type);
+ fieldnum++)
+ {
+ fn_field *fn
+ = TYPE_FN_FIELDLIST1 (param_type, fieldnum);
+ const char *field_name
+ = TYPE_FN_FIELDLIST_NAME (param_type, fieldnum);
+
+ if (field_name[0] == '~')
+ dtor_name = TYPE_FN_FIELD_PHYSNAME (fn, 0);
+ }
+
+ if (dtor_name == nullptr)
+ error (_("expression cannot be evaluated because a destructor "
+ "for the type '%s' could not be found "
+ "(maybe inlined?)"), TYPE_NAME (param_type));
+
+ value *dtor
+ = find_function_in_inferior (dtor_name, 0);
+
+ /* Insert the dtor to the front of the list to call them
+ in reverse order later. */
+ dtors_to_invoke.emplace_front (dtor, clone_ptr);
+ }
+
+ args[i] = clone_ptr;
}
/* Reserve space for the return structure to be written on the
- stack, if necessary. Make certain that the value is correctly
- aligned.
+ stack, if necessary.
While evaluating expressions, we reserve space on the stack for
return values of class type even if the language ABI and the target
if (return_method != return_method_normal
|| (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 -= TYPE_LENGTH (values_type);
- if (gdbarch_frame_align_p (gdbarch))
- sp = gdbarch_frame_align (gdbarch, sp);
- struct_addr = sp;
- }
- else
- {
- /* Stack grows upward. Align the frame, allocate space, and
- then again, re-align the frame??? */
- if (gdbarch_frame_align_p (gdbarch))
- sp = gdbarch_frame_align (gdbarch, sp);
- struct_addr = sp;
- sp += TYPE_LENGTH (values_type);
- if (gdbarch_frame_align_p (gdbarch))
- sp = gdbarch_frame_align (gdbarch, sp);
- }
- }
+ struct_addr = reserve_stack_space (values_type, sp);
std::vector<struct value *> new_args;
if (return_method == return_method_hidden_param)
maybe_remove_breakpoints ();
gdb_assert (retval != NULL);
+
+ /* Destruct the pass-by-ref argument clones. */
+ call_destructors (dtors_to_invoke, default_return_type);
+
return retval;
}
projects / deliverable / binutils-gdb.git / blobdiff