diff options
Diffstat (limited to 'gdb/valops.c')
| -rw-r--r-- | gdb/valops.c | 829 |
1 files changed, 1 insertions, 828 deletions
diff --git a/gdb/valops.c b/gdb/valops.c index a2a2e97..d8261c8 100644 --- a/gdb/valops.c +++ b/gdb/valops.c @@ -34,6 +34,7 @@ #include "regcache.h" #include "cp-abi.h" #include "block.h" +#include "infcall.h" #include <errno.h> #include "gdb_string.h" @@ -49,10 +50,6 @@ extern int overload_debug; static int typecmp (int staticp, int varargs, int nargs, struct field t1[], struct value *t2[]); -static CORE_ADDR find_function_addr (struct value *, struct type **); -static struct value *value_arg_coerce (struct value *, struct type *, int); - - static CORE_ADDR value_push (CORE_ADDR, struct value *); static struct value *search_struct_field (char *, struct value *, int, @@ -84,37 +81,6 @@ static int auto_abandon = 0; int overload_resolution = 0; -/* 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. */ - -int unwind_on_signal_p = 0; - -/* How you should pass arguments to a function depends on whether it - was defined in K&R style or prototype style. If you define a - function using the K&R syntax that takes a `float' argument, then - callers must pass that argument as a `double'. If you define the - function using the prototype syntax, then you must pass the - argument as a `float', with no promotion. - - Unfortunately, on certain older platforms, the debug info doesn't - indicate reliably how each function was defined. A function type's - TYPE_FLAG_PROTOTYPED flag may be clear, even if the function was - defined in prototype style. When calling a function whose - TYPE_FLAG_PROTOTYPED flag is clear, GDB consults this flag to decide - what to do. - - For modern targets, it is proper to assume that, if the prototype - flag is clear, that can be trusted: `float' arguments should be - promoted to `double'. For some older targets, if the prototype - flag is clear, that doesn't tell us anything. The default is to - trust the debug information; the user can override this behavior - with "set coerce-float-to-double 0". */ - -static int coerce_float_to_double; - - /* Find the address of function name NAME in the inferior. */ struct value * @@ -1089,774 +1055,6 @@ legacy_push_arguments (int nargs, struct value **args, CORE_ADDR sp, return sp; } -/* Perform the standard coercions that are specified - for arguments to be passed to C functions. - - If PARAM_TYPE is non-NULL, it is the expected parameter type. - IS_PROTOTYPED is non-zero if the function declaration is prototyped. */ - -static struct value * -value_arg_coerce (struct value *arg, struct type *param_type, - int is_prototyped) -{ - register struct type *arg_type = check_typedef (VALUE_TYPE (arg)); - register struct type *type - = param_type ? check_typedef (param_type) : arg_type; - - 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; - case TYPE_CODE_INT: - case TYPE_CODE_CHAR: - case TYPE_CODE_BOOL: - case TYPE_CODE_ENUM: - /* 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; - } - /* 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; - break; - case TYPE_CODE_FLT: - if (!is_prototyped && coerce_float_to_double) - { - 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; - } - break; - case TYPE_CODE_FUNC: - type = lookup_pointer_type (type); - break; - case TYPE_CODE_ARRAY: - /* Arrays are coerced to pointers to their first element, unless - they are vectors, in which case we want to leave them alone, - because they are passed by value. */ - if (current_language->c_style_arrays) - if (!TYPE_VECTOR (type)) - type = lookup_pointer_type (TYPE_TARGET_TYPE (type)); - break; - case TYPE_CODE_UNDEF: - case TYPE_CODE_PTR: - case TYPE_CODE_STRUCT: - case TYPE_CODE_UNION: - case TYPE_CODE_VOID: - case TYPE_CODE_SET: - case TYPE_CODE_RANGE: - case TYPE_CODE_STRING: - case TYPE_CODE_BITSTRING: - case TYPE_CODE_ERROR: - case TYPE_CODE_MEMBER: - case TYPE_CODE_METHOD: - case TYPE_CODE_COMPLEX: - default: - break; - } - - return value_cast (type, arg); -} - -/* Determine a function's address and its return type from its value. - Calls error() if the function is not valid for calling. */ - -static 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; - - /* 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) - { - 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 = CONVERT_FROM_FUNC_PTR_ADDR (funaddr); - value_type = TYPE_TARGET_TYPE (ftype); - } - else - value_type = builtin_type_int; - } - else if (code == TYPE_CODE_INT) - { - /* Handle the case of functions lacking debugging info. - 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); - - value_type = builtin_type_int; - } - else - error ("Invalid data type for function to be called."); - - *retval_type = value_type; - return funaddr; -} - -/* 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 - function and then hit a breakpoint (get a signal, etc), "backtrace" - will look right. Whether the backtrace needs to actually show the - stack at the time the inferior function was called is debatable, but - it certainly needs to not display garbage. So if you are contemplating - 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). - 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 - during the execution of the function. - - 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; - register int i; - int rc; - CORE_ADDR start_sp; - /* 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. */ - - static ULONGEST *dummy; - int sizeof_dummy1; - char *dummy1; - CORE_ADDR dummy_addr; - CORE_ADDR old_sp; - struct type *value_type; - unsigned char struct_return; - CORE_ADDR struct_addr = 0; - struct regcache *retbuf; - struct cleanup *retbuf_cleanup; - struct inferior_status *inf_status; - struct cleanup *inf_status_cleanup; - CORE_ADDR funaddr; - int using_gcc; /* Set to version of gcc in use, or zero if not gcc */ - CORE_ADDR real_pc; - struct type *param_type = NULL; - struct type *ftype = check_typedef (SYMBOL_TYPE (function)); - int n_method_args = 0; - - dummy = alloca (SIZEOF_CALL_DUMMY_WORDS); - sizeof_dummy1 = REGISTER_SIZE * SIZEOF_CALL_DUMMY_WORDS / sizeof (ULONGEST); - dummy1 = alloca (sizeof_dummy1); - memcpy (dummy, CALL_DUMMY_WORDS, SIZEOF_CALL_DUMMY_WORDS); - - 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); - - /* 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 (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 (); - } - - old_sp = read_sp (); - - /* Ensure that the initial SP is correctly aligned. */ - if (gdbarch_frame_align_p (current_gdbarch)) - { - /* 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 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 - 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 - infinite loop --- when GDB tries to find a generic dummy - frame on the internal dummy frame stack, it will always find - the first one. - - To avoid this problem, the code below always grows the 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)) - /* Stack grows down. */ - sp = gdbarch_frame_align (current_gdbarch, old_sp - 1); - else - /* Stack grows up. */ - sp = gdbarch_frame_align (current_gdbarch, old_sp + 1); - } - gdb_assert ((INNER_THAN (1, 2) && sp <= old_sp) - || (INNER_THAN (2, 1) && sp >= old_sp)); - } - 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. */ - sp = old_sp; - - if (INNER_THAN (1, 2)) - { - /* Stack grows down */ - sp -= sizeof_dummy1; - start_sp = sp; - } - 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. */ - - funaddr = find_function_addr (function, &value_type); - CHECK_TYPEDEF (value_type); - - { - struct block *b = block_for_pc (funaddr); - /* If compiled without -g, assume GCC 2. */ - using_gcc = (b == NULL ? 2 : BLOCK_GCC_COMPILED (b)); - } - - /* Are we returning a value using a structure return or a normal - value return? */ - - struct_return = using_struct_return (function, funaddr, value_type, - using_gcc); - - /* Create a call sequence customized for this function - and the number of arguments for it. */ - 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]); - -#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 - - switch (CALL_DUMMY_LOCATION) - { - case ON_STACK: - dummy_addr = start_sp; - 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); - break; - case AT_ENTRY_POINT: - real_pc = funaddr; - dummy_addr = CALL_DUMMY_ADDRESS (); - 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"); - } - -#ifdef lint - sp = old_sp; /* It really is used, for some ifdef's... */ -#endif - - if (nargs < TYPE_NFIELDS (ftype)) - error ("too few arguments in function call"); - - for (i = nargs - 1; i >= 0; i--) - { - int prototyped; - - /* FIXME drow/2002-05-31: Should just always mark methods as - prototyped. Can we respect TYPE_VARARGS? Probably not. */ - if (TYPE_CODE (ftype) == TYPE_CODE_METHOD) - prototyped = 1; - else - prototyped = TYPE_PROTOTYPED (ftype); - - if (i < TYPE_NFIELDS (ftype)) - args[i] = value_arg_coerce (args[i], TYPE_FIELD_TYPE (ftype, i), - prototyped); - else - args[i] = value_arg_coerce (args[i], NULL, 0); - - /*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 && 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 */ - if (using_gcc == 0) /* && compiler == aCC */ - /* 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 ()) - { - /* 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); - } - } - } - - - /* Reserve space for the return structure to be written on the - stack, if necessary. Make certain that the value is correctly - aligned. */ - - if (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)) - { - /* 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); - 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); - struct_addr = sp; - sp += len; - if (gdbarch_frame_align_p (current_gdbarch)) - sp = gdbarch_frame_align (current_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) - { - /* 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; - - 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; - } - } - - /* 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. */ - sp = DEPRECATED_PUSH_RETURN_ADDRESS (real_pc, 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); - } - -/* 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; - } - - /* 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); - - { - char *name; - struct symbol *symbol; - - name = NULL; - 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) - { - 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); - } - - /* Execute the stack dummy routine, calling FUNCTION. - When it is done, discard the empty frame - after storing the contents of all regs into retbuf. */ - rc = run_stack_dummy (real_pc + CALL_DUMMY_START_OFFSET, retbuf); - - if (rc == 1) - { - /* We stopped inside the FUNCTION because of a random signal. - Further execution of the FUNCTION is not allowed. */ - - if (unwind_on_signal_p) - { - /* The user wants the context restored. */ - - /* We must get back to the frame we were before the dummy - call. */ - frame_pop (get_current_frame ()); - - /* FIXME: Insert a bunch of wrap_here; name can be very long if it's - a C++ name with arguments and stuff. */ - 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.", - 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); - - /* FIXME: Insert a bunch of wrap_here; name can be very long if it's - a C++ name with arguments and stuff. */ - 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.", - name); - } - } - - if (rc == 2) - { - /* 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); - - /* 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, GDB - would be able to resume evaluation of the expression when - the function finally is done executing. Perhaps 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 ("\ -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); - } - - /* If we get here the called FUNCTION run to completion. */ - - /* 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; - } - } -} - /* Create a value for an array by allocating space in the inferior, copying the data into that space, and then setting up an array value. @@ -3485,29 +2683,4 @@ _initialize_valops (void) &setlist), &showlist); overload_resolution = 1; - - add_show_from_set ( - add_set_cmd ("unwindonsignal", no_class, var_boolean, - (char *) &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.", &setlist), - &showlist); - - add_show_from_set - (add_set_cmd ("coerce-float-to-double", class_obscure, var_boolean, - (char *) &coerce_float_to_double, - "Set 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", - &setlist), - &showlist); - coerce_float_to_double = 1; } |