X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Finfcall.c;h=7f0a118de7c495cf835c92295f3ed624a9773426;hb=3dd5b83d5bd7977bb5b98c9ef9bd8345c0f26d80;hp=1ce22fb1c6c02899b6c600bdb0de29d4f59ed29b;hpb=a9fa03de24ded52ad8f1ccac7757dd34df5ad377;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/infcall.c b/gdb/infcall.c index 1ce22fb1c6..b8b7ff5d32 100644 --- a/gdb/infcall.c +++ b/gdb/infcall.c @@ -1,14 +1,14 @@ /* Perform an inferior function call, for GDB, the GNU debugger. - Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, - 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software - Foundation, Inc. + Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, + 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, + 2008, 2009, 2010, 2011 Free Software Foundation, Inc. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or + the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, @@ -17,12 +17,11 @@ GNU General Public License for more details. You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ + along with this program. If not, see . */ #include "defs.h" #include "breakpoint.h" +#include "tracepoint.h" #include "target.h" #include "regcache.h" #include "inferior.h" @@ -30,10 +29,21 @@ #include "block.h" #include "gdbcore.h" #include "language.h" -#include "symfile.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" + +/* If we can't find a function's name from its address, + we print this instead. */ +#define RAW_FUNCTION_ADDRESS_FORMAT "at 0x%s" +#define RAW_FUNCTION_ADDRESS_SIZE (sizeof (RAW_FUNCTION_ADDRESS_FORMAT) \ + + 2 * sizeof (CORE_ADDR)) /* NOTE: cagney/2003-04-16: What's the future of this code? @@ -63,41 +73,104 @@ with "set coerce-float-to-double 0". */ static int coerce_float_to_double_p = 1; +static void +show_coerce_float_to_double_p (struct ui_file *file, int from_tty, + struct cmd_list_element *c, const char *value) +{ + fprintf_filtered (file, + _("Coercion of floats to doubles " + "when calling functions is %s.\n"), + value); +} /* This boolean tells what gdb should do if a signal is received while in a function called from gdb (call dummy). If set, gdb unwinds the stack and restore the context to what as it was before the call. - The default is to stop in the frame where the signal was received. */ + The default is to stop in the frame where the signal was received. */ int unwind_on_signal_p = 0; +static void +show_unwind_on_signal_p (struct ui_file *file, int from_tty, + struct cmd_list_element *c, const char *value) +{ + fprintf_filtered (file, + _("Unwinding of stack if a signal is " + "received while in a call dummy is %s.\n"), + value); +} + +/* This boolean tells what gdb should do if a std::terminate call is + made while in a function called from gdb (call dummy). + As the confines of a single dummy stack prohibit out-of-frame + handlers from handling a raised exception, and as out-of-frame + handlers are common in C++, this can lead to no handler being found + by the unwinder, and a std::terminate call. This is a false positive. + If set, gdb unwinds the stack and restores the context to what it + was before the call. + + The default is to unwind the frame if a std::terminate call is + made. */ + +static int unwind_on_terminating_exception_p = 1; + +static void +show_unwind_on_terminating_exception_p (struct ui_file *file, int from_tty, + struct cmd_list_element *c, + const char *value) + +{ + fprintf_filtered (file, + _("Unwind stack if a C++ exception is " + "unhandled while in a call dummy is %s.\n"), + value); +} /* Perform the standard coercions that are specified - for arguments to be passed to C functions. + for arguments to be passed to C or Ada functions. If PARAM_TYPE is non-NULL, it is the expected parameter type. - IS_PROTOTYPED is non-zero if the function declaration is prototyped. */ + IS_PROTOTYPED is non-zero if the function declaration is prototyped. + SP is the stack pointer were additional data can be pushed (updating + its value as needed). */ static struct value * -value_arg_coerce (struct value *arg, struct type *param_type, - int is_prototyped) +value_arg_coerce (struct gdbarch *gdbarch, struct value *arg, + struct type *param_type, int is_prototyped, CORE_ADDR *sp) { - register struct type *arg_type = check_typedef (VALUE_TYPE (arg)); - register struct type *type + const struct builtin_type *builtin = builtin_type (gdbarch); + struct type *arg_type = check_typedef (value_type (arg)); + struct type *type = param_type ? check_typedef (param_type) : arg_type; + /* Perform any Ada-specific coercion first. */ + if (current_language->la_language == language_ada) + arg = ada_convert_actual (arg, type); + + /* Force the value to the target if we will need its address. At + this point, we could allocate arguments on the stack instead of + calling malloc if we knew that their addresses would not be + saved by the called function. */ + arg = value_coerce_to_target (arg); + switch (TYPE_CODE (type)) { case TYPE_CODE_REF: - if (TYPE_CODE (arg_type) != TYPE_CODE_REF - && TYPE_CODE (arg_type) != TYPE_CODE_PTR) - { - arg = value_addr (arg); - VALUE_TYPE (arg) = param_type; - return arg; - } - break; + { + struct value *new_value; + + if (TYPE_CODE (arg_type) == TYPE_CODE_REF) + return value_cast_pointers (type, arg); + + /* Cast the value to the reference's target type, and then + convert it back to a reference. This will issue an error + if the value was not previously in memory - in some cases + we should clearly be allowing this, but how? */ + new_value = value_cast (TYPE_TARGET_TYPE (type), arg); + new_value = value_ref (new_value); + return new_value; + } case TYPE_CODE_INT: case TYPE_CODE_CHAR: case TYPE_CODE_BOOL: @@ -105,22 +178,22 @@ value_arg_coerce (struct value *arg, struct type *param_type, /* If we don't have a prototype, coerce to integer type if necessary. */ if (!is_prototyped) { - if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_int)) - type = builtin_type_int; + if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_int)) + type = builtin->builtin_int; } /* Currently all target ABIs require at least the width of an integer type for an argument. We may have to conditionalize the following type coercion for future targets. */ - if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_int)) - type = builtin_type_int; + if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_int)) + type = builtin->builtin_int; break; case TYPE_CODE_FLT: if (!is_prototyped && coerce_float_to_double_p) { - if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_double)) - type = builtin_type_double; - else if (TYPE_LENGTH (type) > TYPE_LENGTH (builtin_type_double)) - type = builtin_type_long_double; + if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_double)) + type = builtin->builtin_double; + else if (TYPE_LENGTH (type) > TYPE_LENGTH (builtin->builtin_double)) + type = builtin->builtin_long_double; } break; case TYPE_CODE_FUNC: @@ -144,7 +217,8 @@ value_arg_coerce (struct value *arg, struct type *param_type, case TYPE_CODE_STRING: case TYPE_CODE_BITSTRING: case TYPE_CODE_ERROR: - case TYPE_CODE_MEMBER: + case TYPE_CODE_MEMBERPTR: + case TYPE_CODE_METHODPTR: case TYPE_CODE_METHOD: case TYPE_CODE_COMPLEX: default: @@ -154,65 +228,219 @@ value_arg_coerce (struct value *arg, struct type *param_type, return value_cast (type, arg); } +/* Return the return type of a function with its first instruction exactly at + the PC address. Return NULL otherwise. */ + +static struct type * +find_function_return_type (CORE_ADDR pc) +{ + struct symbol *sym = find_pc_function (pc); + + if (sym != NULL && BLOCK_START (SYMBOL_BLOCK_VALUE (sym)) == pc + && SYMBOL_TYPE (sym) != NULL) + return TYPE_TARGET_TYPE (SYMBOL_TYPE (sym)); + + return NULL; +} + /* Determine a function's address and its return type from its value. Calls error() if the function is not valid for calling. */ CORE_ADDR find_function_addr (struct value *function, struct type **retval_type) { - register struct type *ftype = check_typedef (VALUE_TYPE (function)); - register enum type_code code = TYPE_CODE (ftype); - struct type *value_type; - CORE_ADDR funaddr; + struct type *ftype = check_typedef (value_type (function)); + struct gdbarch *gdbarch = get_type_arch (ftype); + struct type *value_type = NULL; + /* Initialize it just to avoid a GCC false warning. */ + CORE_ADDR funaddr = 0; /* If it's a member function, just look at the function part of it. */ /* Determine address to call. */ - if (code == TYPE_CODE_FUNC || code == TYPE_CODE_METHOD) - { - funaddr = VALUE_ADDRESS (function); - value_type = TYPE_TARGET_TYPE (ftype); - } - else if (code == TYPE_CODE_PTR) + if (TYPE_CODE (ftype) == TYPE_CODE_FUNC + || TYPE_CODE (ftype) == TYPE_CODE_METHOD) + funaddr = value_address (function); + else if (TYPE_CODE (ftype) == TYPE_CODE_PTR) { funaddr = value_as_address (function); ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); if (TYPE_CODE (ftype) == TYPE_CODE_FUNC || TYPE_CODE (ftype) == TYPE_CODE_METHOD) + funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr, + ¤t_target); + } + if (TYPE_CODE (ftype) == TYPE_CODE_FUNC + || TYPE_CODE (ftype) == TYPE_CODE_METHOD) + { + value_type = TYPE_TARGET_TYPE (ftype); + + if (TYPE_GNU_IFUNC (ftype)) { - funaddr = CONVERT_FROM_FUNC_PTR_ADDR (funaddr); - value_type = TYPE_TARGET_TYPE (ftype); + funaddr = gnu_ifunc_resolve_addr (gdbarch, funaddr); + + /* Skip querying the function symbol if no RETVAL_TYPE has been + asked for. */ + if (retval_type) + value_type = find_function_return_type (funaddr); } - else - value_type = builtin_type_int; } - else if (code == TYPE_CODE_INT) + else if (TYPE_CODE (ftype) == TYPE_CODE_INT) { /* Handle the case of functions lacking debugging info. - Their values are characters since their addresses are char */ + Their values are characters since their addresses are char. */ if (TYPE_LENGTH (ftype) == 1) funaddr = value_as_address (value_addr (function)); else - /* Handle integer used as address of a function. */ - funaddr = (CORE_ADDR) value_as_long (function); + { + /* Handle function descriptors lacking debug info. */ + int found_descriptor = 0; - value_type = builtin_type_int; + funaddr = 0; /* pacify "gcc -Werror" */ + if (VALUE_LVAL (function) == lval_memory) + { + CORE_ADDR nfunaddr; + + funaddr = value_as_address (value_addr (function)); + nfunaddr = funaddr; + funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr, + ¤t_target); + if (funaddr != nfunaddr) + found_descriptor = 1; + } + if (!found_descriptor) + /* Handle integer used as address of a function. */ + funaddr = (CORE_ADDR) value_as_long (function); + } } else - error ("Invalid data type for function to be called."); + error (_("Invalid data type for function to be called.")); + + if (retval_type != NULL) + *retval_type = value_type; + return funaddr + gdbarch_deprecated_function_start_offset (gdbarch); +} + +/* For CALL_DUMMY_ON_STACK, push a breakpoint sequence that the called + function returns to. */ + +static CORE_ADDR +push_dummy_code (struct gdbarch *gdbarch, + CORE_ADDR sp, CORE_ADDR funaddr, + struct value **args, int nargs, + struct type *value_type, + CORE_ADDR *real_pc, CORE_ADDR *bp_addr, + struct regcache *regcache) +{ + gdb_assert (gdbarch_push_dummy_code_p (gdbarch)); + + return gdbarch_push_dummy_code (gdbarch, sp, funaddr, + args, nargs, value_type, real_pc, bp_addr, + regcache); +} + +/* 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 + determined. It must be large enough to hold formatted result of + RAW_FUNCTION_ADDRESS_FORMAT. */ + +static const char * +get_function_name (CORE_ADDR funaddr, char *buf, int buf_size) +{ + { + struct symbol *symbol = find_pc_function (funaddr); + + if (symbol) + return SYMBOL_PRINT_NAME (symbol); + } + + { + /* Try the minimal symbols. */ + struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (funaddr); + + if (msymbol) + return SYMBOL_PRINT_NAME (msymbol); + } + + { + char *tmp = xstrprintf (_(RAW_FUNCTION_ADDRESS_FORMAT), + hex_string (funaddr)); - *retval_type = value_type; - return funaddr; + gdb_assert (strlen (tmp) + 1 <= buf_size); + strcpy (buf, tmp); + xfree (tmp); + return buf; + } } -/* Call breakpoint_auto_delete on the current contents of the bpstat - pointed to by arg (which is really a bpstat *). */ +/* Subroutine of call_function_by_hand to simplify it. + Start up the inferior and wait for it to stop. + Return the exception if there's an error, or an exception with + reason >= 0 if there's no error. + + This is done inside a TRY_CATCH so the caller needn't worry about + thrown errors. The caller should rethrow if there's an error. */ + +static struct gdb_exception +run_inferior_call (struct thread_info *call_thread, CORE_ADDR real_pc) +{ + volatile struct gdb_exception e; + int saved_in_infcall = call_thread->control.in_infcall; + ptid_t call_thread_ptid = call_thread->ptid; + + call_thread->control.in_infcall = 1; + + clear_proceed_status (); + + disable_watchpoints_before_interactive_call_start (); + + /* We want stop_registers, please... */ + call_thread->control.proceed_to_finish = 1; + + TRY_CATCH (e, RETURN_MASK_ALL) + { + proceed (real_pc, TARGET_SIGNAL_0, 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)) + { + wait_for_inferior (); + normal_stop (); + } + } + + /* At this point the current thread may have changed. Refresh + CALL_THREAD as it could be invalid if its thread has exited. */ + call_thread = find_thread_ptid (call_thread_ptid); + + enable_watchpoints_after_interactive_call_stop (); + + /* Call breakpoint_auto_delete on the current contents of the bpstat + of inferior call thread. + 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 (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; +} + +/* A cleanup function that calls delete_std_terminate_breakpoint. */ static void -breakpoint_auto_delete_contents (void *arg) +cleanup_delete_std_terminate_breakpoint (void *ignore) { - breakpoint_auto_delete (*(bpstat *) arg); + delete_std_terminate_breakpoint (); } /* All this stuff with a dummy frame may seem unnecessarily complicated @@ -231,82 +459,87 @@ breakpoint_auto_delete_contents (void *arg) May fail to return, if a breakpoint or signal is hit during the execution of the function. - ARGS is modified to contain coerced values. */ + ARGS is modified to contain coerced values. */ struct value * call_function_by_hand (struct value *function, int nargs, struct value **args) { - register CORE_ADDR sp; - CORE_ADDR dummy_addr; - struct type *value_type; - unsigned char struct_return; + CORE_ADDR sp; + struct type *values_type, *target_values_type; + unsigned char struct_return = 0, lang_struct_return = 0; CORE_ADDR struct_addr = 0; - struct regcache *retbuf; - struct cleanup *retbuf_cleanup; - struct inferior_status *inf_status; + struct infcall_control_state *inf_status; struct cleanup *inf_status_cleanup; + struct infcall_suspend_state *caller_state; CORE_ADDR funaddr; - int using_gcc; /* Set to version of gcc in use, or zero if not gcc */ CORE_ADDR real_pc; - struct type *ftype = check_typedef (SYMBOL_TYPE (function)); + struct type *ftype = check_typedef (value_type (function)); CORE_ADDR bp_addr; + struct frame_id dummy_id; + struct cleanup *args_cleanup; + struct frame_info *frame; + struct gdbarch *gdbarch; + struct cleanup *terminate_bp_cleanup; + ptid_t call_thread_ptid; + struct gdb_exception e; + char name_buf[RAW_FUNCTION_ADDRESS_SIZE]; + + if (TYPE_CODE (ftype) == TYPE_CODE_PTR) + ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); if (!target_has_execution) noprocess (); - /* Create a cleanup chain that contains the retbuf (buffer - containing the register values). This chain is create BEFORE the - inf_status chain so that the inferior status can cleaned up - (restored or discarded) without having the retbuf freed. */ - retbuf = regcache_xmalloc (current_gdbarch); - retbuf_cleanup = make_cleanup_regcache_xfree (retbuf); + if (get_traceframe_number () >= 0) + error (_("May not call functions while looking at trace frames.")); - /* A cleanup for the inferior status. Create this AFTER the retbuf - so that this can be discarded or applied without interfering with - the regbuf. */ - inf_status = save_inferior_status (1); - inf_status_cleanup = make_cleanup_restore_inferior_status (inf_status); + if (execution_direction == EXEC_REVERSE) + error (_("Cannot call functions in reverse mode.")); - if (DEPRECATED_PUSH_DUMMY_FRAME_P ()) - { - /* DEPRECATED_PUSH_DUMMY_FRAME is responsible for saving the - inferior registers (and frame_pop() for restoring them). (At - least on most machines) they are saved on the stack in the - inferior. */ - DEPRECATED_PUSH_DUMMY_FRAME; - } - else - { - /* FIXME: cagney/2003-02-26: Step zero of this little tinker is - to extract the generic dummy frame code from the architecture - vector. Hence this direct call. - - A follow-on change is to modify this interface so that it takes - thread OR frame OR tpid as a parameter, and returns a dummy - frame handle. The handle can then be used further down as a - parameter SAVE_DUMMY_FRAME_TOS. Hmm, thinking about it, since - everything is ment to be using generic dummy frames, why not - even use some of the dummy frame code to here - do a regcache - dup and then pass the duped regcache, along with all the other - stuff, at one single point. - - In fact, you can even save the structure's return address in the - dummy frame and fix one of those nasty lost struct return edge - conditions. */ - generic_push_dummy_frame (); - } + frame = get_current_frame (); + gdbarch = get_frame_arch (frame); + + if (!gdbarch_push_dummy_call_p (gdbarch)) + error (_("This target does not support function calls.")); + + /* A cleanup for the inferior status. + This is only needed while we're preparing the inferior function call. */ + inf_status = save_infcall_control_state (); + inf_status_cleanup + = make_cleanup_restore_infcall_control_state (inf_status); + + /* Save the caller's registers and other state associated with the + inferior itself so that they can be restored once the + callee returns. To allow nested calls the registers are (further + down) pushed onto a dummy frame stack. Include a cleanup (which + is tossed once the regcache has been pushed). */ + caller_state = save_infcall_suspend_state (); + make_cleanup_restore_infcall_suspend_state (caller_state); /* Ensure that the initial SP is correctly aligned. */ { - CORE_ADDR old_sp = read_sp (); - if (gdbarch_frame_align_p (current_gdbarch)) + CORE_ADDR old_sp = get_frame_sp (frame); + + if (gdbarch_frame_align_p (gdbarch)) { + sp = gdbarch_frame_align (gdbarch, old_sp); + /* NOTE: cagney/2003-08-13: Skip the "red zone". For some + ABIs, a function can use memory beyond the inner most stack + address. AMD64 called that region the "red zone". Skip at + least the "red zone" size before allocating any space on + the stack. */ + if (gdbarch_inner_than (gdbarch, 1, 2)) + sp -= gdbarch_frame_red_zone_size (gdbarch); + else + sp += gdbarch_frame_red_zone_size (gdbarch); + /* Still aligned? */ + gdb_assert (sp == gdbarch_frame_align (gdbarch, sp)); /* NOTE: cagney/2002-09-18: On a RISC architecture, a void parameterless generic dummy frame (i.e., no parameters, no result) typically does not need to push anything the stack and hence can leave SP and - FP. Similarly, a framelss (possibly leaf) function does + FP. Similarly, a frameless (possibly leaf) function does not push anything on the stack and, hence, that too can leave FP and SP unchanged. As a consequence, a sequence of void parameterless generic dummy frame calls to frameless @@ -321,144 +554,131 @@ call_function_by_hand (struct value *function, int nargs, struct value **args) stack. That way, two dummy frames can never be identical. It does burn a few bytes of stack but that is a small price to pay :-). */ - sp = gdbarch_frame_align (current_gdbarch, old_sp); if (sp == old_sp) { - if (INNER_THAN (1, 2)) + if (gdbarch_inner_than (gdbarch, 1, 2)) /* Stack grows down. */ - sp = gdbarch_frame_align (current_gdbarch, old_sp - 1); + sp = gdbarch_frame_align (gdbarch, old_sp - 1); else /* Stack grows up. */ - sp = gdbarch_frame_align (current_gdbarch, old_sp + 1); + sp = gdbarch_frame_align (gdbarch, old_sp + 1); } - gdb_assert ((INNER_THAN (1, 2) && sp <= old_sp) - || (INNER_THAN (2, 1) && sp >= old_sp)); + /* SP may have underflown address zero here from OLD_SP. Memory access + functions will probably fail in such case but that is a target's + problem. */ } else - /* FIXME: cagney/2002-09-18: Hey, you loose! Who knows how - badly aligned the SP is! Further, per comment above, if the - generic dummy frame ends up empty (because nothing is pushed) - GDB won't be able to correctly perform back traces. If a - target is having trouble with backtraces, first thing to do - is add FRAME_ALIGN() to its architecture vector. After that, - try adding SAVE_DUMMY_FRAME_TOS() and modifying - DEPRECATED_FRAME_CHAIN so that when the next outer frame is a - generic dummy, it returns the current frame's base. */ + /* FIXME: cagney/2002-09-18: Hey, you loose! + + Who knows how badly aligned the SP is! + + If the generic dummy frame ends up empty (because nothing is + pushed) GDB won't be able to correctly perform back traces. + If a target is having trouble with backtraces, first thing to + do is add FRAME_ALIGN() to the architecture vector. If that + fails, try dummy_id(). + + If the ABI specifies a "Red Zone" (see the doco) the code + below will quietly trash it. */ sp = old_sp; } - funaddr = find_function_addr (function, &value_type); - CHECK_TYPEDEF (value_type); + funaddr = find_function_addr (function, &values_type); + if (!values_type) + values_type = builtin_type (gdbarch)->builtin_int; - { - struct block *b = block_for_pc (funaddr); - /* If compiled without -g, assume GCC 2. */ - using_gcc = (b == NULL ? 2 : BLOCK_GCC_COMPILED (b)); - } + CHECK_TYPEDEF (values_type); + + /* Are we returning a value using a structure return (passing a + hidden argument pointing to storage) or a normal value return? + There are two cases: language-mandated structure return and + target ABI structure return. The variable STRUCT_RETURN only + describes the latter. The language version is handled by passing + the return location as the first parameter to the function, + even preceding "this". This is different from the target + ABI version, which is target-specific; for instance, on ia64 + 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)) + { + lang_struct_return = 1; + + /* Tell the target specific argument pushing routine not to + expect a value. */ + target_values_type = builtin_type (gdbarch)->builtin_void; + } + else + { + struct_return = using_struct_return (gdbarch, + value_type (function), values_type); + target_values_type = values_type; + } - /* Are we returning a value using a structure return or a normal - value return? */ + /* 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. */ - struct_return = using_struct_return (function, funaddr, value_type, - using_gcc); + /* The actual breakpoint (at BP_ADDR) is inserted separatly so there + is no need to write that out. */ - switch (CALL_DUMMY_LOCATION) + 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 ()); + break; + case AT_ENTRY_POINT: { - /* CALL_DUMMY is an array of words (REGISTER_SIZE), but each - word is in host byte order. Before calling FIX_CALL_DUMMY, - we byteswap it and remove any extra bytes which might exist - because ULONGEST is bigger than REGISTER_SIZE. */ - /* NOTE: This is pretty wierd, as the call dummy is actually a - sequence of instructions. But CISC machines will have to - pack the instructions into REGISTER_SIZE units (and so will - RISC machines for which INSTRUCTION_SIZE is not - REGISTER_SIZE). */ - /* NOTE: This is pretty stupid. CALL_DUMMY should be in - strict target byte order. */ - CORE_ADDR start_sp; - ULONGEST *dummy = alloca (SIZEOF_CALL_DUMMY_WORDS); - int sizeof_dummy1 = (REGISTER_SIZE * SIZEOF_CALL_DUMMY_WORDS - / sizeof (ULONGEST)); - char *dummy1 = alloca (sizeof_dummy1); - memcpy (dummy, CALL_DUMMY_WORDS, SIZEOF_CALL_DUMMY_WORDS); - if (INNER_THAN (1, 2)) + CORE_ADDR dummy_addr; + + 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. */ + bp_addr = dummy_addr; + break; + } + case AT_SYMBOL: + /* Some executables define a symbol __CALL_DUMMY_ADDRESS whose + address is the location where the breakpoint should be + placed. Once all targets are using the overhauled frame code + this can be deleted - ON_STACK is a better option. */ + { + struct minimal_symbol *sym; + CORE_ADDR dummy_addr; + + sym = lookup_minimal_symbol ("__CALL_DUMMY_ADDRESS", NULL, NULL); + real_pc = funaddr; + if (sym) { - /* Stack grows down */ - sp -= sizeof_dummy1; - start_sp = sp; + dummy_addr = SYMBOL_VALUE_ADDRESS (sym); + /* Make certain that the address points at real code, and not + a function descriptor. */ + dummy_addr = gdbarch_convert_from_func_ptr_addr (gdbarch, + dummy_addr, + ¤t_target); } else - { - /* Stack grows up */ - start_sp = sp; - sp += sizeof_dummy1; - } - /* NOTE: cagney/2002-09-10: Don't bother re-adjusting the - stack after allocating space for the call dummy. A target - can specify a SIZEOF_DUMMY1 (via SIZEOF_CALL_DUMMY_WORDS) - such that all local alignment requirements are met. */ - /* Create a call sequence customized for this function and the - number of arguments for it. */ - { - int i; - for (i = 0; i < (int) (SIZEOF_CALL_DUMMY_WORDS / sizeof (dummy[0])); - i++) - store_unsigned_integer (&dummy1[i * REGISTER_SIZE], - REGISTER_SIZE, - (ULONGEST) dummy[i]); - } - /* NOTE: cagney/2003-04-22: This computation of REAL_PC, - BP_ADDR and DUMMY_ADDR is pretty messed up. It comes from - constant tinkering with the values. Instead a - FIX_CALL_DUMMY replacement (PUSH_DUMMY_BREAKPOINT?) should - just do everything. */ -#ifdef GDB_TARGET_IS_HPPA - real_pc = FIX_CALL_DUMMY (dummy1, start_sp, funaddr, nargs, args, - value_type, using_gcc); -#else - if (FIX_CALL_DUMMY_P ()) - { - /* gdb_assert (CALL_DUMMY_LOCATION == ON_STACK) true? */ - FIX_CALL_DUMMY (dummy1, start_sp, funaddr, nargs, args, value_type, - using_gcc); - } - real_pc = start_sp; -#endif - dummy_addr = start_sp; - /* Yes, the offset is applied to the real_pc and not the dummy - addr. Ulgh! Blame the HP/UX target. */ - bp_addr = real_pc + CALL_DUMMY_BREAKPOINT_OFFSET; - /* Yes, the offset is applied to the real_pc and not the - dummy_addr. Ulgh! Blame the HP/UX target. */ - real_pc += CALL_DUMMY_START_OFFSET; - write_memory (start_sp, (char *) dummy1, sizeof_dummy1); - if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES) - generic_save_call_dummy_addr (start_sp, start_sp + sizeof_dummy1); + dummy_addr = entry_point_address (); + /* A call dummy always consists of just a single breakpoint, + so it's address is the same as the address of the dummy. */ + bp_addr = dummy_addr; break; } - case AT_ENTRY_POINT: - real_pc = funaddr; - dummy_addr = CALL_DUMMY_ADDRESS (); - /* A call dummy always consists of just a single breakpoint, so - it's address is the same as the address of the dummy. */ - bp_addr = dummy_addr; - if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES) - /* NOTE: cagney/2002-04-13: The entry point is going to be - modified with a single breakpoint. */ - generic_save_call_dummy_addr (CALL_DUMMY_ADDRESS (), - CALL_DUMMY_ADDRESS () + 1); - break; default: - internal_error (__FILE__, __LINE__, "bad switch"); + internal_error (__FILE__, __LINE__, _("bad switch")); } if (nargs < TYPE_NFIELDS (ftype)) - error ("too few arguments in function call"); + error (_("Too few arguments in function call.")); { int i; + for (i = nargs - 1; i >= 0; i--) { int prototyped; @@ -477,404 +697,307 @@ call_function_by_hand (struct value *function, int nargs, struct value **args) param_type = TYPE_FIELD_TYPE (ftype, i); else param_type = NULL; - - args[i] = value_arg_coerce (args[i], param_type, prototyped); - - /* elz: this code is to handle the case in which the function - to be called has a pointer to function as parameter and the - corresponding actual argument is the address of a function - and not a pointer to function variable. In aCC compiled - code, the calls through pointers to functions (in the body - of the function called by hand) are made via - $$dyncall_external which requires some registers setting, - this is taken care of if we call via a function pointer - variable, but not via a function address. In cc this is - not a problem. */ - - if (using_gcc == 0) - { - if (param_type != NULL && TYPE_CODE (ftype) != TYPE_CODE_METHOD) - { - /* if this parameter is a pointer to function. */ - if (TYPE_CODE (param_type) == TYPE_CODE_PTR) - if (TYPE_CODE (TYPE_TARGET_TYPE (param_type)) == TYPE_CODE_FUNC) - /* elz: FIXME here should go the test about the - compiler used to compile the target. We want to - issue the error message only if the compiler - used was HP's aCC. If we used HP's cc, then - there is no problem and no need to return at - this point. */ - /* Go see if the actual parameter is a variable of - type pointer to function or just a function. */ - if (args[i]->lval == not_lval) - { - char *arg_name; - if (find_pc_partial_function ((CORE_ADDR) args[i]->aligner.contents[0], &arg_name, NULL, NULL)) - error ("\ -You cannot use function <%s> as argument. \n\ -You must use a pointer to function type variable. Command ignored.", arg_name); - } - } - } - } - } - if (REG_STRUCT_HAS_ADDR_P ()) - { - int i; - /* This is a machine like the sparc, where we may need to pass a - pointer to the structure, not the structure itself. */ - for (i = nargs - 1; i >= 0; i--) - { - struct type *arg_type = check_typedef (VALUE_TYPE (args[i])); - if ((TYPE_CODE (arg_type) == TYPE_CODE_STRUCT - || TYPE_CODE (arg_type) == TYPE_CODE_UNION - || TYPE_CODE (arg_type) == TYPE_CODE_ARRAY - || TYPE_CODE (arg_type) == TYPE_CODE_STRING - || TYPE_CODE (arg_type) == TYPE_CODE_BITSTRING - || TYPE_CODE (arg_type) == TYPE_CODE_SET - || (TYPE_CODE (arg_type) == TYPE_CODE_FLT - && TYPE_LENGTH (arg_type) > 8) - ) - && REG_STRUCT_HAS_ADDR (using_gcc, arg_type)) - { - CORE_ADDR addr; - int len; /* = TYPE_LENGTH (arg_type); */ - int aligned_len; - arg_type = check_typedef (VALUE_ENCLOSING_TYPE (args[i])); - len = TYPE_LENGTH (arg_type); - - if (STACK_ALIGN_P ()) - /* MVS 11/22/96: I think at least some of this - stack_align code is really broken. Better to let - PUSH_ARGUMENTS adjust the stack in a target-defined - manner. */ - aligned_len = STACK_ALIGN (len); - else - aligned_len = len; - if (INNER_THAN (1, 2)) - { - /* stack grows downward */ - sp -= aligned_len; - /* ... so the address of the thing we push is the - stack pointer after we push it. */ - addr = sp; - } - else - { - /* The stack grows up, so the address of the thing - we push is the stack pointer before we push it. */ - addr = sp; - sp += aligned_len; - } - /* Push the structure. */ - write_memory (addr, VALUE_CONTENTS_ALL (args[i]), len); - /* The value we're going to pass is the address of the - thing we just pushed. */ - /*args[i] = value_from_longest (lookup_pointer_type (value_type), - (LONGEST) addr); */ - args[i] = value_from_pointer (lookup_pointer_type (arg_type), - addr); - } - } - } + args[i] = value_arg_coerce (gdbarch, args[i], + param_type, prototyped, &sp); + if (param_type != NULL && language_pass_by_reference (param_type)) + args[i] = value_addr (args[i]); + } + } /* 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) + if (struct_return || lang_struct_return) { - int len = TYPE_LENGTH (value_type); - if (STACK_ALIGN_P ()) - /* NOTE: cagney/2003-03-22: Should rely on frame align, rather - than stack align to force the alignment of the stack. */ - len = STACK_ALIGN (len); - if (INNER_THAN (1, 2)) + int len = TYPE_LENGTH (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; - if (gdbarch_frame_align_p (current_gdbarch)) - sp = gdbarch_frame_align (current_gdbarch, sp); + 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 (current_gdbarch)) - sp = gdbarch_frame_align (current_gdbarch, sp); + then again, re-align the frame??? */ + if (gdbarch_frame_align_p (gdbarch)) + sp = gdbarch_frame_align (gdbarch, sp); struct_addr = sp; sp += len; - if (gdbarch_frame_align_p (current_gdbarch)) - sp = gdbarch_frame_align (current_gdbarch, sp); + if (gdbarch_frame_align_p (gdbarch)) + sp = gdbarch_frame_align (gdbarch, sp); } } - /* elz: on HPPA no need for this extra alignment, maybe it is needed - on other architectures. This is because all the alignment is - taken care of in the above code (ifdef REG_STRUCT_HAS_ADDR) and - in hppa_push_arguments */ - /* NOTE: cagney/2003-03-24: The below code is very broken. Given an - odd sized parameter the below will mis-align the stack. As was - suggested back in '96, better to let PUSH_ARGUMENTS handle it. */ - if (DEPRECATED_EXTRA_STACK_ALIGNMENT_NEEDED) + if (lang_struct_return) { - /* MVS 11/22/96: I think at least some of this stack_align code - is really broken. Better to let push_dummy_call() adjust the - stack in a target-defined manner. */ - if (STACK_ALIGN_P () && INNER_THAN (1, 2)) - { - /* If stack grows down, we must leave a hole at the top. */ - int len = 0; - int i; - for (i = nargs - 1; i >= 0; i--) - len += TYPE_LENGTH (VALUE_ENCLOSING_TYPE (args[i])); - if (DEPRECATED_CALL_DUMMY_STACK_ADJUST_P ()) - len += DEPRECATED_CALL_DUMMY_STACK_ADJUST; - sp -= STACK_ALIGN (len) - len; - } + struct value **new_args; + + /* Add the new argument to the front of the argument list. */ + new_args = xmalloc (sizeof (struct value *) * (nargs + 1)); + new_args[0] = value_from_pointer (lookup_pointer_type (values_type), + struct_addr); + memcpy (&new_args[1], &args[0], sizeof (struct value *) * nargs); + args = new_args; + nargs++; + args_cleanup = make_cleanup (xfree, args); } + else + args_cleanup = make_cleanup (null_cleanup, NULL); /* Create the dummy stack frame. Pass in the call dummy address as, presumably, the ABI code knows where, in the call dummy, the return address should be pointed. */ - if (gdbarch_push_dummy_call_p (current_gdbarch)) - /* When there is no push_dummy_call method, should this code - simply error out. That would the implementation of this method - for all ABIs (which is probably a good thing). */ - sp = gdbarch_push_dummy_call (current_gdbarch, current_regcache, - dummy_addr, nargs, args, sp, struct_return, - struct_addr); - else if (DEPRECATED_PUSH_ARGUMENTS_P ()) - /* Keep old targets working. */ - sp = DEPRECATED_PUSH_ARGUMENTS (nargs, args, sp, struct_return, - struct_addr); - else - sp = legacy_push_arguments (nargs, args, sp, struct_return, struct_addr); - - if (DEPRECATED_PUSH_RETURN_ADDRESS_P ()) - /* for targets that use no CALL_DUMMY */ - /* There are a number of targets now which actually don't write - any CALL_DUMMY instructions into the target, but instead just - save the machine state, push the arguments, and jump directly - to the callee function. Since this doesn't actually involve - executing a JSR/BSR instruction, the return address must be set - up by hand, either by pushing onto the stack or copying into a - return-address register as appropriate. Formerly this has been - done in PUSH_ARGUMENTS, but that's overloading its - functionality a bit, so I'm making it explicit to do it here. */ - /* NOTE: cagney/2003-04-22: The first parameter ("real_pc") has - been replaced with zero, it turns out that no implementation - used that parameter. This occured because the value being - supplied - the address of the called function's entry point - instead of the address of the breakpoint that the called - function should return to - wasn't useful. */ - sp = DEPRECATED_PUSH_RETURN_ADDRESS (0, sp); - - /* NOTE: cagney/2003-03-23: Diable this code when there is a - push_dummy_call() method. Since that method will have already - handled any alignment issues, the code below is entirely - redundant. */ - if (!gdbarch_push_dummy_call_p (current_gdbarch) - && STACK_ALIGN_P () && !INNER_THAN (1, 2)) - { - /* If stack grows up, we must leave a hole at the bottom, note - that sp already has been advanced for the arguments! */ - if (DEPRECATED_CALL_DUMMY_STACK_ADJUST_P ()) - sp += DEPRECATED_CALL_DUMMY_STACK_ADJUST; - sp = STACK_ALIGN (sp); - } + sp = gdbarch_push_dummy_call (gdbarch, function, get_current_regcache (), + bp_addr, nargs, args, + sp, struct_return, struct_addr); -/* XXX This seems wrong. For stacks that grow down we shouldn't do - anything here! */ - /* MVS 11/22/96: I think at least some of this stack_align code is - really broken. Better to let PUSH_ARGUMENTS adjust the stack in - a target-defined manner. */ - if (DEPRECATED_CALL_DUMMY_STACK_ADJUST_P ()) - if (INNER_THAN (1, 2)) - { - /* stack grows downward */ - sp -= DEPRECATED_CALL_DUMMY_STACK_ADJUST; - } + do_cleanups (args_cleanup); + + /* Set up a frame ID for the dummy frame so we can pass it to + set_momentary_breakpoint. We need to give the breakpoint a frame + ID so that the breakpoint code can correctly re-identify the + dummy breakpoint. */ + /* Sanity. The exact same SP value is returned by PUSH_DUMMY_CALL, + saved as the dummy-frame TOS, and used by dummy_id to form + the frame ID's stack address. */ + dummy_id = frame_id_build (sp, bp_addr); - /* Store the address at which the structure is supposed to be - written. */ - /* NOTE: 2003-03-24: Since PUSH_ARGUMENTS can (and typically does) - store the struct return address, this call is entirely redundant. */ - if (struct_return && DEPRECATED_STORE_STRUCT_RETURN_P ()) - DEPRECATED_STORE_STRUCT_RETURN (struct_addr, sp); - - /* Write the stack pointer. This is here because the statements above - might fool with it. On SPARC, this write also stores the register - window into the right place in the new stack frame, which otherwise - wouldn't happen. (See store_inferior_registers in sparc-nat.c.) */ - /* NOTE: cagney/2003-03-23: Disable this code when there is a - push_dummy_call() method. Since that method will have already - stored the stack pointer (as part of creating the fake call - frame), and none of the code following that code adjusts the - stack-pointer value, the below call is entirely redundant. */ - if (DEPRECATED_DUMMY_WRITE_SP_P ()) - DEPRECATED_DUMMY_WRITE_SP (sp); - - if (SAVE_DUMMY_FRAME_TOS_P ()) - SAVE_DUMMY_FRAME_TOS (sp); - - /* Now proceed, having reached the desired place. */ - clear_proceed_status (); - /* Create a momentary breakpoint at the return address of the inferior. That way it breaks when it returns. */ { struct breakpoint *bpt; struct symtab_and_line sal; - struct frame_id frame; + init_sal (&sal); /* initialize to zeroes */ + sal.pspace = current_program_space; sal.pc = bp_addr; sal.section = find_pc_overlay (sal.pc); - /* Set up a frame ID for the dummy frame so we can pass it to - set_momentary_breakpoint. We need to give the breakpoint a - frame ID so that the breakpoint code can correctly re-identify - the dummy breakpoint. */ - /* The assumption here is that push_dummy_call() returned the - stack part of the frame ID. Unfortunatly, many older - architectures were, via a convoluted mess, relying on the - poorly defined and greatly overloaded DEPRECATED_TARGET_READ_FP - or DEPRECATED_FP_REGNUM to supply the value. */ - if (DEPRECATED_TARGET_READ_FP_P ()) - frame = frame_id_build (DEPRECATED_TARGET_READ_FP (), sal.pc); - else if (DEPRECATED_FP_REGNUM >= 0) - frame = frame_id_build (read_register (DEPRECATED_FP_REGNUM), sal.pc); - else - frame = frame_id_build (sp, sal.pc); - bpt = set_momentary_breakpoint (sal, frame, bp_call_dummy); + /* Sanity. The exact same SP value is returned by + PUSH_DUMMY_CALL, saved as the dummy-frame TOS, and used by + dummy_id to form the frame ID's stack address. */ + bpt = set_momentary_breakpoint (gdbarch, sal, dummy_id, bp_call_dummy); bpt->disposition = disp_del; } - /* Execute a "stack dummy", a piece of code stored in the stack by - the debugger to be executed in the inferior. - - The dummy's frame is automatically popped whenever that break is - hit. If that is the first time the program stops, - call_function_by_hand returns to its caller with that frame - already gone and sets RC to 0. - - Otherwise, set RC to a non-zero value. If the called function - receives a random signal, we do not allow the user to continue - executing it as this may not work. The dummy frame is poped and - we return 1. If we hit a breakpoint, we leave the frame in place - and return 2 (the frame will eventually be popped when we do hit - the dummy end breakpoint). */ - + /* Create a breakpoint in std::terminate. + If a C++ exception is raised in the dummy-frame, and the + exception handler is (normally, and expected to be) out-of-frame, + the default C++ handler will (wrongly) be called in an inferior + function call. This is wrong, as an exception can be normally + and legally handled out-of-frame. The confines of the dummy frame + prevent the unwinder from finding the correct handler (or any + handler, unless it is in-frame). The default handler calls + std::terminate. This will kill the inferior. Assert that + terminate should never be called in an inferior function + call. Place a momentary breakpoint in the std::terminate function + and if triggered in the call, rewind. */ + if (unwind_on_terminating_exception_p) + set_std_terminate_breakpoint (); + + /* 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); + + /* Discard both inf_status and caller_state cleanups. + From this point on we explicitly restore the associated state + or discard it. */ + discard_cleanups (inf_status_cleanup); + + /* Register a clean-up for unwind_on_terminating_exception_breakpoint. */ + terminate_bp_cleanup = make_cleanup (cleanup_delete_std_terminate_breakpoint, + NULL); + + /* - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - + If you're looking to implement asynchronous dummy-frames, then + just below is the place to chop this function in two.. */ + + /* TP is invalid after run_inferior_call returns, so enclose this + in a block so that it's only in scope during the time it's valid. */ { - struct cleanup *old_cleanups = make_cleanup (null_cleanup, 0); - int saved_async = 0; - - /* 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. */ - make_cleanup (breakpoint_auto_delete_contents, &stop_bpstat); - - disable_watchpoints_before_interactive_call_start (); - proceed_to_finish = 1; /* We want stop_registers, please... */ - - if (target_can_async_p ()) - saved_async = target_async_mask (0); - - proceed (real_pc, TARGET_SIGNAL_0, 0); - - if (saved_async) - target_async_mask (saved_async); - - enable_watchpoints_after_interactive_call_stop (); - - discard_cleanups (old_cleanups); + struct thread_info *tp = inferior_thread (); + + /* Save this thread's ptid, we need it later but the thread + may have exited. */ + call_thread_ptid = tp->ptid; + + /* Run the inferior until it stops. */ + + e = run_inferior_call (tp, real_pc); } - if (stopped_by_random_signal || !stop_stack_dummy) + /* Rethrow an error if we got one trying to run the inferior. */ + + if (e.reason < 0) { - /* Find the name of the function we're about to complain about. */ - char *name = NULL; - { - struct symbol *symbol = find_pc_function (funaddr); - if (symbol) - name = SYMBOL_PRINT_NAME (symbol); - else - { - /* Try the minimal symbols. */ - struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (funaddr); - if (msymbol) - name = SYMBOL_PRINT_NAME (msymbol); - } - } - if (name == NULL) + const char *name = get_function_name (funaddr, + name_buf, sizeof (name_buf)); + + discard_infcall_control_state (inf_status); + + /* We could discard the dummy frame here if the program exited, + but it will get garbage collected the next time the program is + run anyway. */ + + switch (e.reason) { - /* NOTE: cagney/2003-04-23: Don't blame me. This code dates - back to 1993-07-08, I simply moved it. */ - char format[80]; - sprintf (format, "at %s", local_hex_format ()); - name = alloca (80); - /* FIXME-32x64: assumes funaddr fits in a long. */ - sprintf (name, format, (unsigned long) funaddr); + case RETURN_ERROR: + throw_error (e.error, _("%s\n\ +An error occurred while in a function called from GDB.\n\ +Evaluation of the expression containing the function\n\ +(%s) will be abandoned.\n\ +When the function is done executing, GDB will silently stop."), + e.message, name); + case RETURN_QUIT: + default: + throw_exception (e); } + } + + /* If the program has exited, or we stopped at a different thread, + exit and inform the user. */ + + if (! target_has_execution) + { + const char *name = get_function_name (funaddr, + name_buf, sizeof (name_buf)); + + /* If we try to restore the inferior status, + we'll crash as the inferior is no longer running. */ + discard_infcall_control_state (inf_status); + + /* We could discard the dummy frame here given that the program exited, + but it will get garbage collected the next time the program is + run anyway. */ + + error (_("The program being debugged exited while in a function " + "called from GDB.\n" + "Evaluation of the expression containing the function\n" + "(%s) will be abandoned."), + name); + } + + if (! ptid_equal (call_thread_ptid, inferior_ptid)) + { + const char *name = get_function_name (funaddr, + name_buf, sizeof (name_buf)); + + /* We've switched threads. This can happen if another thread gets a + signal or breakpoint while our thread was running. + There's no point in restoring the inferior status, + we're in a different thread. */ + discard_infcall_control_state (inf_status); + /* Keep the dummy frame record, if the user switches back to the + thread with the hand-call, we'll need it. */ + if (stopped_by_random_signal) + error (_("\ +The program received a signal in another thread while\n\ +making a function call from GDB.\n\ +Evaluation of the expression containing the function\n\ +(%s) will be abandoned.\n\ +When the function is done executing, GDB will silently stop."), + name); + else + error (_("\ +The program stopped in another thread while making a function call from GDB.\n\ +Evaluation of the expression containing the function\n\ +(%s) will be abandoned.\n\ +When the function is done executing, GDB will silently stop."), + name); + } + + if (stopped_by_random_signal || stop_stack_dummy != STOP_STACK_DUMMY) + { + const char *name = get_function_name (funaddr, + name_buf, sizeof (name_buf)); + if (stopped_by_random_signal) { /* We stopped inside the FUNCTION because of a random signal. Further execution of the FUNCTION is not - allowed. */ + allowed. */ if (unwind_on_signal_p) { - /* The user wants the context restored. */ + /* The user wants the context restored. */ /* We must get back to the frame we were before the - dummy call. */ - frame_pop (get_current_frame ()); + dummy call. */ + dummy_frame_pop (dummy_id); + + /* We also need to restore inferior status to that before the + dummy call. */ + restore_infcall_control_state (inf_status); /* FIXME: Insert a bunch of wrap_here; name can be very long if it's a C++ name with arguments and stuff. */ - error ("\ + error (_("\ The program being debugged was signaled while in a function called from GDB.\n\ GDB has restored the context to what it was before the call.\n\ -To change this behavior use \"set unwindonsignal off\"\n\ -Evaluation of the expression containing the function (%s) will be abandoned.", +To change this behavior use \"set unwindonsignal off\".\n\ +Evaluation of the expression containing the function\n\ +(%s) will be abandoned."), name); } else { /* The user wants to stay in the frame where we stopped - (default).*/ - /* If we restored the inferior status (via the cleanup), - we would print a spurious error message (Unable to - restore previously selected frame), would write the - registers from the inf_status (which is wrong), and - would do other wrong things. */ - discard_cleanups (inf_status_cleanup); - discard_inferior_status (inf_status); + (default). + Discard inferior status, we're not at the same point + we started at. */ + discard_infcall_control_state (inf_status); + /* FIXME: Insert a bunch of wrap_here; name can be very long if it's a C++ name with arguments and stuff. */ - error ("\ + error (_("\ The program being debugged was signaled while in a function called from GDB.\n\ GDB remains in the frame where the signal was received.\n\ -To change this behavior use \"set unwindonsignal on\"\n\ -Evaluation of the expression containing the function (%s) will be abandoned.", +To change this behavior use \"set unwindonsignal on\".\n\ +Evaluation of the expression containing the function\n\ +(%s) will be abandoned.\n\ +When the function is done executing, GDB will silently stop."), name); } } - if (!stop_stack_dummy) + if (stop_stack_dummy == STOP_STD_TERMINATE) { - /* We hit a breakpoint inside the FUNCTION. */ - /* If we restored the inferior status (via the cleanup), we - would print a spurious error message (Unable to restore - previously selected frame), would write the registers - from the inf_status (which is wrong), and would do other - wrong things. */ - discard_cleanups (inf_status_cleanup); - discard_inferior_status (inf_status); + /* We must get back to the frame we were before the dummy + call. */ + dummy_frame_pop (dummy_id); + + /* We also need to restore inferior status to that before + the dummy call. */ + restore_infcall_control_state (inf_status); + + error (_("\ +The program being debugged entered a std::terminate call, most likely\n\ +caused by an unhandled C++ exception. GDB blocked this call in order\n\ +to prevent the program from being terminated, and has restored the\n\ +context to its original state before the call.\n\ +To change this behaviour use \"set unwind-on-terminating-exception off\".\n\ +Evaluation of the expression containing the function (%s)\n\ +will be abandoned."), + name); + } + else if (stop_stack_dummy == STOP_NONE) + { + + /* We hit a breakpoint inside the FUNCTION. + Keep the dummy frame, the user may want to examine its state. + Discard inferior status, we're not at the same point + we started at. */ + discard_infcall_control_state (inf_status); + /* The following error message used to say "The expression which contained the function call has been discarded." It is a hard concept to explain in a few words. Ideally, @@ -883,99 +1006,117 @@ Evaluation of the expression containing the function (%s) will be abandoned.", someday this will be implemented (it would not be easy). */ /* FIXME: Insert a bunch of wrap_here; name can be very long if it's a C++ name with arguments and stuff. */ - error ("\ + error (_("\ The program being debugged stopped while in a function called from GDB.\n\ -When the function (%s) is done executing, GDB will silently\n\ -stop (instead of continuing to evaluate the expression containing\n\ -the function call).", name); +Evaluation of the expression containing the function\n\ +(%s) will be abandoned.\n\ +When the function is done executing, GDB will silently stop."), + name); } /* The above code errors out, so ... */ - internal_error (__FILE__, __LINE__, "... should not be here"); + internal_error (__FILE__, __LINE__, _("... should not be here")); } - /* If we get here the called FUNCTION run to completion. */ - - /* On normal return, the stack dummy has been popped already. */ - regcache_cpy_no_passthrough (retbuf, stop_registers); - - /* Restore the inferior status, via its cleanup. At this stage, - leave the RETBUF alone. */ - do_cleanups (inf_status_cleanup); - - /* Figure out the value returned by the function. */ - /* elz: I defined this new macro for the hppa architecture only. - this gives us a way to get the value returned by the function - from the stack, at the same address we told the function to put - it. We cannot assume on the pa that r28 still contains the - address of the returned structure. Usually this will be - overwritten by the callee. I don't know about other - architectures, so I defined this macro */ -#ifdef VALUE_RETURNED_FROM_STACK - if (struct_return) - { - do_cleanups (retbuf_cleanup); - return VALUE_RETURNED_FROM_STACK (value_type, struct_addr); - } -#endif - /* NOTE: cagney/2002-09-10: Only when the stack has been correctly - aligned (using frame_align()) do we can trust STRUCT_ADDR and - fetch the return value direct from the stack. This lack of trust - comes about because legacy targets have a nasty habit of - silently, and local to PUSH_ARGUMENTS(), moving STRUCT_ADDR. For - such targets, just hope that value_being_returned() can find the - adjusted value. */ - if (struct_return && gdbarch_frame_align_p (current_gdbarch)) - { - struct value *retval = value_at (value_type, struct_addr, NULL); - do_cleanups (retbuf_cleanup); - return retval; - } - else - { - struct value *retval = value_being_returned (value_type, retbuf, - struct_return); - do_cleanups (retbuf_cleanup); - return retval; - } + do_cleanups (terminate_bp_cleanup); + + /* If we get here the called FUNCTION ran to completion, + and the dummy frame has already been popped. */ + + { + struct address_space *aspace = get_regcache_aspace (stop_registers); + struct regcache *retbuf = regcache_xmalloc (gdbarch, aspace); + struct cleanup *retbuf_cleanup = make_cleanup_regcache_xfree (retbuf); + struct value *retval = NULL; + + regcache_cpy_no_passthrough (retbuf, stop_registers); + + /* Inferior call is successful. Restore the inferior status. + 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 the function returns void, don't bother fetching the + return value. */ + switch (gdbarch_return_value (gdbarch, value_type (function), + target_values_type, NULL, NULL, NULL)) + { + case RETURN_VALUE_REGISTER_CONVENTION: + case RETURN_VALUE_ABI_RETURNS_ADDRESS: + case RETURN_VALUE_ABI_PRESERVES_ADDRESS: + gdbarch_return_value (gdbarch, value_type (function), values_type, + retbuf, value_contents_raw (retval), NULL); + break; + case RETURN_VALUE_STRUCT_CONVENTION: + read_value_memory (retval, 0, 1, struct_addr, + value_contents_raw (retval), + TYPE_LENGTH (values_type)); + break; + } + } + + do_cleanups (retbuf_cleanup); + + gdb_assert (retval); + return retval; + } } + +/* Provide a prototype to silence -Wmissing-prototypes. */ void _initialize_infcall (void); void _initialize_infcall (void) { add_setshow_boolean_cmd ("coerce-float-to-double", class_obscure, - &coerce_float_to_double_p, "\ -Set coercion of floats to doubles when calling functions\n\ + &coerce_float_to_double_p, _("\ +Set coercion of floats to doubles when calling functions."), _("\ +Show coercion of floats to doubles when calling functions"), _("\ Variables of type float should generally be converted to doubles before\n\ calling an unprototyped function, and left alone when calling a prototyped\n\ function. However, some older debug info formats do not provide enough\n\ information to determine that a function is prototyped. If this flag is\n\ set, GDB will perform the conversion for a function it considers\n\ unprototyped.\n\ -The default is to perform the conversion.\n", "\ -Show coercion of floats to doubles when calling functions\n\ -Variables of type float should generally be converted to doubles before\n\ -calling an unprototyped function, and left alone when calling a prototyped\n\ -function. However, some older debug info formats do not provide enough\n\ -information to determine that a function is prototyped. If this flag is\n\ -set, GDB will perform the conversion for a function it considers\n\ -unprototyped.\n\ -The default is to perform the conversion.\n", - NULL, NULL, &setlist, &showlist); +The default is to perform the conversion.\n"), + NULL, + show_coerce_float_to_double_p, + &setlist, &showlist); add_setshow_boolean_cmd ("unwindonsignal", no_class, - &unwind_on_signal_p, "\ -Set unwinding of stack if a signal is received while in a call dummy.\n\ -The unwindonsignal lets the user determine what gdb should do if a signal\n\ -is received while in a function called from gdb (call dummy). If set, gdb\n\ -unwinds the stack and restore the context to what as it was before the call.\n\ -The default is to stop in the frame where the signal was received.", "\ -Set unwinding of stack if a signal is received while in a call dummy.\n\ + &unwind_on_signal_p, _("\ +Set unwinding of stack if a signal is received while in a call dummy."), _("\ +Show unwinding of stack if a signal is received while in a call dummy."), _("\ The unwindonsignal lets the user determine what gdb should do if a signal\n\ is received while in a function called from gdb (call dummy). If set, gdb\n\ unwinds the stack and restore the context to what as it was before the call.\n\ -The default is to stop in the frame where the signal was received.", - NULL, NULL, &setlist, &showlist); +The default is to stop in the frame where the signal was received."), + NULL, + show_unwind_on_signal_p, + &setlist, &showlist); + + add_setshow_boolean_cmd ("unwind-on-terminating-exception", no_class, + &unwind_on_terminating_exception_p, _("\ +Set unwinding of stack if std::terminate is called while in call dummy."), _("\ +Show unwinding of stack if std::terminate() is called while in a call dummy."), + _("\ +The unwind on terminating exception flag lets the user determine\n\ +what gdb should do if a std::terminate() call is made from the\n\ +default exception handler. If set, gdb unwinds the stack and restores\n\ +the context to what it was before the call. If unset, gdb allows the\n\ +std::terminate call to proceed.\n\ +The default is to unwind the frame."), + NULL, + show_unwind_on_terminating_exception_p, + &setlist, &showlist); + }