diff options
Diffstat (limited to 'gdb/eval.c')
| -rw-r--r-- | gdb/eval.c | 1989 |
1 files changed, 1989 insertions, 0 deletions
diff --git a/gdb/eval.c b/gdb/eval.c new file mode 100644 index 00000000000..d3c34657396 --- /dev/null +++ b/gdb/eval.c @@ -0,0 +1,1989 @@ +/* Evaluate expressions for GDB. + Copyright 1986, 87, 89, 91, 92, 93, 94, 95, 96, 97, 1998 + 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 +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +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. */ + +#include "defs.h" +#include "gdb_string.h" +#include "symtab.h" +#include "gdbtypes.h" +#include "value.h" +#include "expression.h" +#include "target.h" +#include "frame.h" +#include "demangle.h" +#include "language.h" /* For CAST_IS_CONVERSION */ +#include "f-lang.h" /* for array bound stuff */ + +/* Defined in symtab.c */ +extern int hp_som_som_object_present; + +/* This is defined in valops.c */ +extern int overload_resolution; + + +/* Prototypes for local functions. */ + +static value_ptr evaluate_subexp_for_sizeof PARAMS ((struct expression *, + int *)); + +static value_ptr evaluate_subexp_for_address PARAMS ((struct expression *, + int *, enum noside)); + +static value_ptr evaluate_subexp PARAMS ((struct type *, struct expression *, + int *, enum noside)); + +static char *get_label PARAMS ((struct expression *, int *)); + +static value_ptr +evaluate_struct_tuple PARAMS ((value_ptr, struct expression *, int *, + enum noside, int)); + +static LONGEST +init_array_element PARAMS ((value_ptr, value_ptr, struct expression *, + int *, enum noside, LONGEST, LONGEST)); + +#ifdef __GNUC__ +inline +#endif +static value_ptr +evaluate_subexp (expect_type, exp, pos, noside) + struct type *expect_type; + register struct expression *exp; + register int *pos; + enum noside noside; +{ + return (*exp->language_defn->evaluate_exp) (expect_type, exp, pos, noside); +} + +/* Parse the string EXP as a C expression, evaluate it, + and return the result as a number. */ + +CORE_ADDR +parse_and_eval_address (exp) + char *exp; +{ + struct expression *expr = parse_expression (exp); + register CORE_ADDR addr; + register struct cleanup *old_chain = + make_cleanup ((make_cleanup_func) free_current_contents, &expr); + + addr = value_as_pointer (evaluate_expression (expr)); + do_cleanups (old_chain); + return addr; +} + +/* Like parse_and_eval_address but takes a pointer to a char * variable + and advanced that variable across the characters parsed. */ + +CORE_ADDR +parse_and_eval_address_1 (expptr) + char **expptr; +{ + struct expression *expr = parse_exp_1 (expptr, (struct block *)0, 0); + register CORE_ADDR addr; + register struct cleanup *old_chain = + make_cleanup ((make_cleanup_func) free_current_contents, &expr); + + addr = value_as_pointer (evaluate_expression (expr)); + do_cleanups (old_chain); + return addr; +} + +value_ptr +parse_and_eval (exp) + char *exp; +{ + struct expression *expr = parse_expression (exp); + register value_ptr val; + register struct cleanup *old_chain + = make_cleanup ((make_cleanup_func) free_current_contents, &expr); + + val = evaluate_expression (expr); + do_cleanups (old_chain); + return val; +} + +/* Parse up to a comma (or to a closeparen) + in the string EXPP as an expression, evaluate it, and return the value. + EXPP is advanced to point to the comma. */ + +value_ptr +parse_to_comma_and_eval (expp) + char **expp; +{ + struct expression *expr = parse_exp_1 (expp, (struct block *) 0, 1); + register value_ptr val; + register struct cleanup *old_chain + = make_cleanup ((make_cleanup_func) free_current_contents, &expr); + + val = evaluate_expression (expr); + do_cleanups (old_chain); + return val; +} + +/* Evaluate an expression in internal prefix form + such as is constructed by parse.y. + + See expression.h for info on the format of an expression. */ + +value_ptr +evaluate_expression (exp) + struct expression *exp; +{ + int pc = 0; + return evaluate_subexp (NULL_TYPE, exp, &pc, EVAL_NORMAL); +} + +/* Evaluate an expression, avoiding all memory references + and getting a value whose type alone is correct. */ + +value_ptr +evaluate_type (exp) + struct expression *exp; +{ + int pc = 0; + return evaluate_subexp (NULL_TYPE, exp, &pc, EVAL_AVOID_SIDE_EFFECTS); +} + +/* If the next expression is an OP_LABELED, skips past it, + returning the label. Otherwise, does nothing and returns NULL. */ + +static char* +get_label (exp, pos) + register struct expression *exp; + int *pos; +{ + if (exp->elts[*pos].opcode == OP_LABELED) + { + int pc = (*pos)++; + char *name = &exp->elts[pc + 2].string; + int tem = longest_to_int (exp->elts[pc + 1].longconst); + (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1); + return name; + } + else + return NULL; +} + +/* This function evaluates tupes (in Chill) or brace-initializers + (in C/C++) for structure types. */ + +static value_ptr +evaluate_struct_tuple (struct_val, exp, pos, noside, nargs) + value_ptr struct_val; + register struct expression *exp; + register int *pos; + enum noside noside; + int nargs; +{ + struct type *struct_type = check_typedef (VALUE_TYPE (struct_val)); + struct type *substruct_type = struct_type; + struct type *field_type; + int fieldno = -1; + int variantno = -1; + int subfieldno = -1; + while (--nargs >= 0) + { + int pc = *pos; + value_ptr val = NULL; + int nlabels = 0; + int bitpos, bitsize; + char *addr; + + /* Skip past the labels, and count them. */ + while (get_label (exp, pos) != NULL) + nlabels++; + + do + { + char *label = get_label (exp, &pc); + if (label) + { + for (fieldno = 0; fieldno < TYPE_NFIELDS (struct_type); + fieldno++) + { + char *field_name = TYPE_FIELD_NAME (struct_type, fieldno); + if (field_name != NULL && STREQ (field_name, label)) + { + variantno = -1; + subfieldno = fieldno; + substruct_type = struct_type; + goto found; + } + } + for (fieldno = 0; fieldno < TYPE_NFIELDS (struct_type); + fieldno++) + { + char *field_name = TYPE_FIELD_NAME (struct_type, fieldno); + field_type = TYPE_FIELD_TYPE (struct_type, fieldno); + if ((field_name == 0 || *field_name == '\0') + && TYPE_CODE (field_type) == TYPE_CODE_UNION) + { + variantno = 0; + for (; variantno < TYPE_NFIELDS (field_type); + variantno++) + { + substruct_type + = TYPE_FIELD_TYPE (field_type, variantno); + if (TYPE_CODE (substruct_type) == TYPE_CODE_STRUCT) + { + for (subfieldno = 0; + subfieldno < TYPE_NFIELDS (substruct_type); + subfieldno++) + { + if (STREQ (TYPE_FIELD_NAME (substruct_type, + subfieldno), + label)) + { + goto found; + } + } + } + } + } + } + error ("there is no field named %s", label); + found: + ; + } + else + { + /* Unlabelled tuple element - go to next field. */ + if (variantno >= 0) + { + subfieldno++; + if (subfieldno >= TYPE_NFIELDS (substruct_type)) + { + variantno = -1; + substruct_type = struct_type; + } + } + if (variantno < 0) + { + fieldno++; + subfieldno = fieldno; + if (fieldno >= TYPE_NFIELDS (struct_type)) + error ("too many initializers"); + field_type = TYPE_FIELD_TYPE (struct_type, fieldno); + if (TYPE_CODE (field_type) == TYPE_CODE_UNION + && TYPE_FIELD_NAME (struct_type, fieldno)[0] == '0') + error ("don't know which variant you want to set"); + } + } + + /* Here, struct_type is the type of the inner struct, + while substruct_type is the type of the inner struct. + These are the same for normal structures, but a variant struct + contains anonymous union fields that contain substruct fields. + The value fieldno is the index of the top-level (normal or + anonymous union) field in struct_field, while the value + subfieldno is the index of the actual real (named inner) field + in substruct_type. */ + + field_type = TYPE_FIELD_TYPE (substruct_type, subfieldno); + if (val == 0) + val = evaluate_subexp (field_type, exp, pos, noside); + + /* Now actually set the field in struct_val. */ + + /* Assign val to field fieldno. */ + if (VALUE_TYPE (val) != field_type) + val = value_cast (field_type, val); + + bitsize = TYPE_FIELD_BITSIZE (substruct_type, subfieldno); + bitpos = TYPE_FIELD_BITPOS (struct_type, fieldno); + if (variantno >= 0) + bitpos += TYPE_FIELD_BITPOS (substruct_type, subfieldno); + addr = VALUE_CONTENTS (struct_val) + bitpos / 8; + if (bitsize) + modify_field (addr, value_as_long (val), + bitpos % 8, bitsize); + else + memcpy (addr, VALUE_CONTENTS (val), + TYPE_LENGTH (VALUE_TYPE (val))); + } while (--nlabels > 0); + } + return struct_val; +} + +/* Recursive helper function for setting elements of array tuples for Chill. + The target is ARRAY (which has bounds LOW_BOUND to HIGH_BOUND); + the element value is ELEMENT; + EXP, POS and NOSIDE are as usual. + Evaluates index expresions and sets the specified element(s) of + ARRAY to ELEMENT. + Returns last index value. */ + +static LONGEST +init_array_element (array, element, exp, pos, noside, low_bound, high_bound) + value_ptr array, element; + register struct expression *exp; + register int *pos; + enum noside noside; + LONGEST low_bound, high_bound; +{ + LONGEST index; + int element_size = TYPE_LENGTH (VALUE_TYPE (element)); + if (exp->elts[*pos].opcode == BINOP_COMMA) + { + (*pos)++; + init_array_element (array, element, exp, pos, noside, + low_bound, high_bound); + return init_array_element (array, element, + exp, pos, noside, low_bound, high_bound); + } + else if (exp->elts[*pos].opcode == BINOP_RANGE) + { + LONGEST low, high; + (*pos)++; + low = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside)); + high = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside)); + if (low < low_bound || high > high_bound) + error ("tuple range index out of range"); + for (index = low ; index <= high; index++) + { + memcpy (VALUE_CONTENTS_RAW (array) + + (index - low_bound) * element_size, + VALUE_CONTENTS (element), element_size); + } + } + else + { + index = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside)); + if (index < low_bound || index > high_bound) + error ("tuple index out of range"); + memcpy (VALUE_CONTENTS_RAW (array) + (index - low_bound) * element_size, + VALUE_CONTENTS (element), element_size); + } + return index; +} + +value_ptr +evaluate_subexp_standard (expect_type, exp, pos, noside) + struct type *expect_type; + register struct expression *exp; + register int *pos; + enum noside noside; +{ + enum exp_opcode op; + int tem, tem2, tem3; + register int pc, pc2 = 0, oldpos; + register value_ptr arg1 = NULL, arg2 = NULL, arg3; + struct type *type; + int nargs; + value_ptr *argvec; + int upper, lower, retcode; + int code; + int ix; + long mem_offset; + struct symbol * sym; + struct type ** arg_types; + int save_pos1; + + /* This expect_type crap should not be used for C. C expressions do + not have any notion of expected types, never has and (goddess + willing) never will. The C++ code uses it for some twisted + purpose (I haven't investigated but I suspect it just the usual + combination of Stroustrup figuring out some crazy language + feature and Tiemann figuring out some crazier way to try to + implement it). CHILL has the tuple stuff; I don't know enough + about CHILL to know whether expected types is the way to do it. + FORTRAN I don't know. */ + if (exp->language_defn->la_language != language_cplus + && exp->language_defn->la_language != language_chill) + expect_type = NULL_TYPE; + + pc = (*pos)++; + op = exp->elts[pc].opcode; + + switch (op) + { + case OP_SCOPE: + tem = longest_to_int (exp->elts[pc + 2].longconst); + (*pos) += 4 + BYTES_TO_EXP_ELEM (tem + 1); + arg1 = value_struct_elt_for_reference (exp->elts[pc + 1].type, + 0, + exp->elts[pc + 1].type, + &exp->elts[pc + 3].string, + expect_type); + if (arg1 == NULL) + error ("There is no field named %s", &exp->elts[pc + 3].string); + return arg1; + + case OP_LONG: + (*pos) += 3; + return value_from_longest (exp->elts[pc + 1].type, + exp->elts[pc + 2].longconst); + + case OP_DOUBLE: + (*pos) += 3; + return value_from_double (exp->elts[pc + 1].type, + exp->elts[pc + 2].doubleconst); + + case OP_VAR_VALUE: + (*pos) += 3; + if (noside == EVAL_SKIP) + goto nosideret; + if (noside == EVAL_AVOID_SIDE_EFFECTS) + { + struct symbol * sym = exp->elts[pc + 2].symbol; + enum lval_type lv; + + switch (SYMBOL_CLASS (sym)) + { + case LOC_CONST: + case LOC_LABEL: + case LOC_CONST_BYTES: + lv = not_lval; + break; + + case LOC_REGISTER: + case LOC_REGPARM: + lv = lval_register; + break; + + default: + lv = lval_memory; + break; + } + + return value_zero (SYMBOL_TYPE (sym), lv); + } + else + return value_of_variable (exp->elts[pc + 2].symbol, + exp->elts[pc + 1].block); + + case OP_LAST: + (*pos) += 2; + return + access_value_history (longest_to_int (exp->elts[pc + 1].longconst)); + + case OP_REGISTER: + { + int regno = longest_to_int (exp->elts[pc + 1].longconst); + value_ptr val = value_of_register (regno); + + (*pos) += 2; + if (val == NULL) + error ("Value of register %s not available.", REGISTER_NAME (regno)); + else + return val; + } + case OP_BOOL: + (*pos) += 2; + return value_from_longest (LA_BOOL_TYPE, + exp->elts[pc + 1].longconst); + + case OP_INTERNALVAR: + (*pos) += 2; + return value_of_internalvar (exp->elts[pc + 1].internalvar); + + case OP_STRING: + tem = longest_to_int (exp->elts[pc + 1].longconst); + (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1); + if (noside == EVAL_SKIP) + goto nosideret; + return value_string (&exp->elts[pc + 2].string, tem); + + case OP_BITSTRING: + tem = longest_to_int (exp->elts[pc + 1].longconst); + (*pos) + += 3 + BYTES_TO_EXP_ELEM ((tem + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT); + if (noside == EVAL_SKIP) + goto nosideret; + return value_bitstring (&exp->elts[pc + 2].string, tem); + break; + + case OP_ARRAY: + (*pos) += 3; + tem2 = longest_to_int (exp->elts[pc + 1].longconst); + tem3 = longest_to_int (exp->elts[pc + 2].longconst); + nargs = tem3 - tem2 + 1; + type = expect_type ? check_typedef (expect_type) : NULL_TYPE; + + if (expect_type != NULL_TYPE && noside != EVAL_SKIP + && TYPE_CODE (type) == TYPE_CODE_STRUCT) + { + value_ptr rec = allocate_value (expect_type); + memset (VALUE_CONTENTS_RAW (rec), '\0', TYPE_LENGTH (type)); + return evaluate_struct_tuple (rec, exp, pos, noside, nargs); + } + + if (expect_type != NULL_TYPE && noside != EVAL_SKIP + && TYPE_CODE (type) == TYPE_CODE_ARRAY) + { + struct type *range_type = TYPE_FIELD_TYPE (type, 0); + struct type *element_type = TYPE_TARGET_TYPE (type); + value_ptr array = allocate_value (expect_type); + int element_size = TYPE_LENGTH (check_typedef (element_type)); + LONGEST low_bound, high_bound, index; + if (get_discrete_bounds (range_type, &low_bound, &high_bound) < 0) + { + low_bound = 0; + high_bound = (TYPE_LENGTH (type) / element_size) - 1; + } + index = low_bound; + memset (VALUE_CONTENTS_RAW (array), 0, TYPE_LENGTH (expect_type)); + for (tem = nargs; --nargs >= 0; ) + { + value_ptr element; + int index_pc = 0; + if (exp->elts[*pos].opcode == BINOP_RANGE) + { + index_pc = ++(*pos); + evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP); + } + element = evaluate_subexp (element_type, exp, pos, noside); + if (VALUE_TYPE (element) != element_type) + element = value_cast (element_type, element); + if (index_pc) + { + int continue_pc = *pos; + *pos = index_pc; + index = init_array_element (array, element, exp, pos, noside, + low_bound, high_bound); + *pos = continue_pc; + } + else + { + if (index > high_bound) + /* to avoid memory corruption */ + error ("Too many array elements"); + memcpy (VALUE_CONTENTS_RAW (array) + + (index - low_bound) * element_size, + VALUE_CONTENTS (element), + element_size); + } + index++; + } + return array; + } + + if (expect_type != NULL_TYPE && noside != EVAL_SKIP + && TYPE_CODE (type) == TYPE_CODE_SET) + { + value_ptr set = allocate_value (expect_type); + char *valaddr = VALUE_CONTENTS_RAW (set); + struct type *element_type = TYPE_INDEX_TYPE (type); + struct type *check_type = element_type; + LONGEST low_bound, high_bound; + + /* get targettype of elementtype */ + while (TYPE_CODE (check_type) == TYPE_CODE_RANGE || + TYPE_CODE (check_type) == TYPE_CODE_TYPEDEF) + check_type = TYPE_TARGET_TYPE (check_type); + + if (get_discrete_bounds (element_type, &low_bound, &high_bound) < 0) + error ("(power)set type with unknown size"); + memset (valaddr, '\0', TYPE_LENGTH (type)); + for (tem = 0; tem < nargs; tem++) + { + LONGEST range_low, range_high; + struct type *range_low_type, *range_high_type; + value_ptr elem_val; + if (exp->elts[*pos].opcode == BINOP_RANGE) + { + (*pos)++; + elem_val = evaluate_subexp (element_type, exp, pos, noside); + range_low_type = VALUE_TYPE (elem_val); + range_low = value_as_long (elem_val); + elem_val = evaluate_subexp (element_type, exp, pos, noside); + range_high_type = VALUE_TYPE (elem_val); + range_high = value_as_long (elem_val); + } + else + { + elem_val = evaluate_subexp (element_type, exp, pos, noside); + range_low_type = range_high_type = VALUE_TYPE (elem_val); + range_low = range_high = value_as_long (elem_val); + } + /* check types of elements to avoid mixture of elements from + different types. Also check if type of element is "compatible" + with element type of powerset */ + if (TYPE_CODE (range_low_type) == TYPE_CODE_RANGE) + range_low_type = TYPE_TARGET_TYPE (range_low_type); + if (TYPE_CODE (range_high_type) == TYPE_CODE_RANGE) + range_high_type = TYPE_TARGET_TYPE (range_high_type); + if ((TYPE_CODE (range_low_type) != TYPE_CODE (range_high_type)) || + (TYPE_CODE (range_low_type) == TYPE_CODE_ENUM && + (range_low_type != range_high_type))) + /* different element modes */ + error ("POWERSET tuple elements of different mode"); + if ((TYPE_CODE (check_type) != TYPE_CODE (range_low_type)) || + (TYPE_CODE (check_type) == TYPE_CODE_ENUM && + range_low_type != check_type)) + error ("incompatible POWERSET tuple elements"); + if (range_low > range_high) + { + warning ("empty POWERSET tuple range"); + continue; + } + if (range_low < low_bound || range_high > high_bound) + error ("POWERSET tuple element out of range"); + range_low -= low_bound; + range_high -= low_bound; + for ( ; range_low <= range_high; range_low++) + { + int bit_index = (unsigned) range_low % TARGET_CHAR_BIT; + if (BITS_BIG_ENDIAN) + bit_index = TARGET_CHAR_BIT - 1 - bit_index; + valaddr [(unsigned) range_low / TARGET_CHAR_BIT] + |= 1 << bit_index; + } + } + return set; + } + + argvec = (value_ptr *) alloca (sizeof (value_ptr) * nargs); + for (tem = 0; tem < nargs; tem++) + { + /* Ensure that array expressions are coerced into pointer objects. */ + argvec[tem] = evaluate_subexp_with_coercion (exp, pos, noside); + } + if (noside == EVAL_SKIP) + goto nosideret; + return value_array (tem2, tem3, argvec); + + case TERNOP_SLICE: + { + value_ptr array = evaluate_subexp (NULL_TYPE, exp, pos, noside); + int lowbound + = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside)); + int upper + = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside)); + if (noside == EVAL_SKIP) + goto nosideret; + return value_slice (array, lowbound, upper - lowbound + 1); + } + + case TERNOP_SLICE_COUNT: + { + value_ptr array = evaluate_subexp (NULL_TYPE, exp, pos, noside); + int lowbound + = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside)); + int length + = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside)); + return value_slice (array, lowbound, length); + } + + case TERNOP_COND: + /* Skip third and second args to evaluate the first one. */ + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + if (value_logical_not (arg1)) + { + evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP); + return evaluate_subexp (NULL_TYPE, exp, pos, noside); + } + else + { + arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP); + return arg2; + } + + case OP_FUNCALL: + (*pos) += 2; + op = exp->elts[*pos].opcode; + nargs = longest_to_int (exp->elts[pc + 1].longconst); + /* Allocate arg vector, including space for the function to be + called in argvec[0] and a terminating NULL */ + argvec = (value_ptr *) alloca (sizeof (value_ptr) * (nargs + 3)); + if (op == STRUCTOP_MEMBER || op == STRUCTOP_MPTR) + { + LONGEST fnptr; + + /* 1997-08-01 Currently we do not support function invocation + via pointers-to-methods with HP aCC. Pointer does not point + to the function, but possibly to some thunk. */ + if (hp_som_som_object_present) + { + error ("Not implemented: function invocation through pointer to method with HP aCC"); + } + + nargs++; + /* First, evaluate the structure into arg2 */ + pc2 = (*pos)++; + + if (noside == EVAL_SKIP) + goto nosideret; + + if (op == STRUCTOP_MEMBER) + { + arg2 = evaluate_subexp_for_address (exp, pos, noside); + } + else + { + arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + } + + /* If the function is a virtual function, then the + aggregate value (providing the structure) plays + its part by providing the vtable. Otherwise, + it is just along for the ride: call the function + directly. */ + + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + + fnptr = value_as_long (arg1); + + if (METHOD_PTR_IS_VIRTUAL(fnptr)) + { + int fnoffset = METHOD_PTR_TO_VOFFSET(fnptr); + struct type *basetype; + struct type *domain_type = + TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (VALUE_TYPE (arg1))); + int i, j; + basetype = TYPE_TARGET_TYPE (VALUE_TYPE (arg2)); + if (domain_type != basetype) + arg2 = value_cast(lookup_pointer_type (domain_type), arg2); + basetype = TYPE_VPTR_BASETYPE (domain_type); + for (i = TYPE_NFN_FIELDS (basetype) - 1; i >= 0; i--) + { + struct fn_field *f = TYPE_FN_FIELDLIST1 (basetype, i); + /* If one is virtual, then all are virtual. */ + if (TYPE_FN_FIELD_VIRTUAL_P (f, 0)) + for (j = TYPE_FN_FIELDLIST_LENGTH (basetype, i) - 1; j >= 0; --j) + if ((int) TYPE_FN_FIELD_VOFFSET (f, j) == fnoffset) + { + value_ptr temp = value_ind (arg2); + arg1 = value_virtual_fn_field (&temp, f, j, domain_type, 0); + arg2 = value_addr (temp); + goto got_it; + } + } + if (i < 0) + error ("virtual function at index %d not found", fnoffset); + } + else + { + VALUE_TYPE (arg1) = lookup_pointer_type (TYPE_TARGET_TYPE (VALUE_TYPE (arg1))); + } + got_it: + + /* Now, say which argument to start evaluating from */ + tem = 2; + } + else if (op == STRUCTOP_STRUCT || op == STRUCTOP_PTR) + { + /* Hair for method invocations */ + int tem2; + + nargs++; + /* First, evaluate the structure into arg2 */ + pc2 = (*pos)++; + tem2 = longest_to_int (exp->elts[pc2 + 1].longconst); + *pos += 3 + BYTES_TO_EXP_ELEM (tem2 + 1); + if (noside == EVAL_SKIP) + goto nosideret; + + if (op == STRUCTOP_STRUCT) + { + /* If v is a variable in a register, and the user types + v.method (), this will produce an error, because v has + no address. + + A possible way around this would be to allocate a + copy of the variable on the stack, copy in the + contents, call the function, and copy out the + contents. I.e. convert this from call by reference + to call by copy-return (or whatever it's called). + However, this does not work because it is not the + same: the method being called could stash a copy of + the address, and then future uses through that address + (after the method returns) would be expected to + use the variable itself, not some copy of it. */ + arg2 = evaluate_subexp_for_address (exp, pos, noside); + } + else + { + arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + } + /* Now, say which argument to start evaluating from */ + tem = 2; + } + else + { + /* Non-method function call */ + save_pos1 = *pos; + argvec[0] = evaluate_subexp_with_coercion (exp, pos, noside); + tem = 1; + type = VALUE_TYPE (argvec[0]); + if (type && TYPE_CODE (type) == TYPE_CODE_PTR) + type = TYPE_TARGET_TYPE (type); + if (type && TYPE_CODE (type) == TYPE_CODE_FUNC) + { + for (; tem <= nargs && tem <= TYPE_NFIELDS (type); tem++) + { + /* pai: FIXME This seems to be coercing arguments before + * overload resolution has been done! */ + argvec[tem] = evaluate_subexp (TYPE_FIELD_TYPE (type, tem-1), + exp, pos, noside); + } + } + } + + /* Evaluate arguments */ + for (; tem <= nargs; tem++) + { + /* Ensure that array expressions are coerced into pointer objects. */ + argvec[tem] = evaluate_subexp_with_coercion (exp, pos, noside); + } + + /* signal end of arglist */ + argvec[tem] = 0; + + if (op == STRUCTOP_STRUCT || op == STRUCTOP_PTR) + { + int static_memfuncp; + value_ptr temp = arg2; + char tstr[256]; + struct fn_field * fns_ptr; + int num_fns; + struct type * basetype; + int boffset; + + /* Method invocation : stuff "this" as first parameter */ + /* pai: this used to have lookup_pointer_type for some reason, + * but temp is already a pointer to the object */ + argvec[1] = value_from_longest (VALUE_TYPE (temp), + VALUE_ADDRESS (temp)+VALUE_OFFSET (temp)); + /* Name of method from expression */ + strcpy(tstr, &exp->elts[pc2+2].string); + + if (overload_resolution && (exp->language_defn->la_language == language_cplus)) + { + /* Language is C++, do some overload resolution before evaluation */ + value_ptr valp = NULL; + + /* Prepare list of argument types for overload resolution */ + arg_types = (struct type **) xmalloc (nargs * (sizeof (struct type *))); + for (ix=1; ix <= nargs; ix++) + arg_types[ix-1] = VALUE_TYPE (argvec[ix]); + + (void) find_overload_match (arg_types, nargs, tstr, + 1 /* method */, 0 /* strict match */, + arg2 /* the object */, NULL, + &valp, NULL, &static_memfuncp); + + + argvec[1] = arg2; /* the ``this'' pointer */ + argvec[0] = valp; /* use the method found after overload resolution */ + } + else /* Non-C++ case -- or no overload resolution */ + { + temp = arg2; + argvec[0] = value_struct_elt (&temp, argvec+1, tstr, + &static_memfuncp, + op == STRUCTOP_STRUCT + ? "structure" : "structure pointer"); + argvec[1] = arg2; /* the ``this'' pointer */ + } + + if (static_memfuncp) + { + argvec[1] = argvec[0]; + nargs--; + argvec++; + } + } + else if (op == STRUCTOP_MEMBER || op == STRUCTOP_MPTR) + { + argvec[1] = arg2; + argvec[0] = arg1; + } + else + { + /* Non-member function being called */ + + if (overload_resolution && (exp->language_defn->la_language == language_cplus)) + { + /* Language is C++, do some overload resolution before evaluation */ + struct symbol * symp; + + /* Prepare list of argument types for overload resolution */ + arg_types = (struct type **) xmalloc (nargs * (sizeof (struct type *))); + for (ix=1; ix <= nargs; ix++) + arg_types[ix-1] = VALUE_TYPE (argvec[ix]); + + (void) find_overload_match (arg_types, nargs, NULL /* no need for name */, + 0 /* not method */, 0 /* strict match */, + NULL, exp->elts[5].symbol /* the function */, + NULL, &symp, NULL); + + /* Now fix the expression being evaluated */ + exp->elts[5].symbol = symp; + argvec[0] = evaluate_subexp_with_coercion (exp, &save_pos1, noside); + } + else + { + /* Not C++, or no overload resolution allowed */ + /* nothing to be done; argvec already correctly set up */ + } + } + + do_call_it: + + if (noside == EVAL_SKIP) + goto nosideret; + if (noside == EVAL_AVOID_SIDE_EFFECTS) + { + /* If the return type doesn't look like a function type, call an + error. This can happen if somebody tries to turn a variable into + a function call. This is here because people often want to + call, eg, strcmp, which gdb doesn't know is a function. If + gdb isn't asked for it's opinion (ie. through "whatis"), + it won't offer it. */ + + struct type *ftype = + TYPE_TARGET_TYPE (VALUE_TYPE (argvec[0])); + + if (ftype) + return allocate_value (TYPE_TARGET_TYPE (VALUE_TYPE (argvec[0]))); + else + error ("Expression of type other than \"Function returning ...\" used as function"); + } + if (argvec[0] == NULL) + error ("Cannot evaluate function -- may be inlined"); + return call_function_by_hand (argvec[0], nargs, argvec + 1); + /* pai: FIXME save value from call_function_by_hand, then adjust pc by adjust_fn_pc if +ve */ + + case OP_F77_UNDETERMINED_ARGLIST: + + /* Remember that in F77, functions, substring ops and + array subscript operations cannot be disambiguated + at parse time. We have made all array subscript operations, + substring operations as well as function calls come here + and we now have to discover what the heck this thing actually was. + If it is a function, we process just as if we got an OP_FUNCALL. */ + + nargs = longest_to_int (exp->elts[pc+1].longconst); + (*pos) += 2; + + /* First determine the type code we are dealing with. */ + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + type = check_typedef (VALUE_TYPE (arg1)); + code = TYPE_CODE (type); + + switch (code) + { + case TYPE_CODE_ARRAY: + goto multi_f77_subscript; + + case TYPE_CODE_STRING: + goto op_f77_substr; + + case TYPE_CODE_PTR: + case TYPE_CODE_FUNC: + /* It's a function call. */ + /* Allocate arg vector, including space for the function to be + called in argvec[0] and a terminating NULL */ + argvec = (value_ptr *) alloca (sizeof (value_ptr) * (nargs + 2)); + argvec[0] = arg1; + tem = 1; + for (; tem <= nargs; tem++) + argvec[tem] = evaluate_subexp_with_coercion (exp, pos, noside); + argvec[tem] = 0; /* signal end of arglist */ + goto do_call_it; + + default: + error ("Cannot perform substring on this type"); + } + + op_f77_substr: + /* We have a substring operation on our hands here, + let us get the string we will be dealing with */ + + /* Now evaluate the 'from' and 'to' */ + + arg2 = evaluate_subexp_with_coercion (exp, pos, noside); + + if (nargs < 2) + return value_subscript (arg1, arg2); + + arg3 = evaluate_subexp_with_coercion (exp, pos, noside); + + if (noside == EVAL_SKIP) + goto nosideret; + + tem2 = value_as_long (arg2); + tem3 = value_as_long (arg3); + + return value_slice (arg1, tem2, tem3 - tem2 + 1); + + case OP_COMPLEX: + /* We have a complex number, There should be 2 floating + point numbers that compose it */ + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + + return value_literal_complex (arg1, arg2, builtin_type_f_complex_s16); + + case STRUCTOP_STRUCT: + tem = longest_to_int (exp->elts[pc + 1].longconst); + (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1); + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + if (noside == EVAL_SKIP) + goto nosideret; + if (noside == EVAL_AVOID_SIDE_EFFECTS) + return value_zero (lookup_struct_elt_type (VALUE_TYPE (arg1), + &exp->elts[pc + 2].string, + 0), + lval_memory); + else + { + value_ptr temp = arg1; + return value_struct_elt (&temp, NULL, &exp->elts[pc + 2].string, + NULL, "structure"); + } + + case STRUCTOP_PTR: + tem = longest_to_int (exp->elts[pc + 1].longconst); + (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1); + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + if (noside == EVAL_SKIP) + goto nosideret; + if (noside == EVAL_AVOID_SIDE_EFFECTS) + return value_zero (lookup_struct_elt_type (VALUE_TYPE (arg1), + &exp->elts[pc + 2].string, + 0), + lval_memory); + else + { + value_ptr temp = arg1; + return value_struct_elt (&temp, NULL, &exp->elts[pc + 2].string, + NULL, "structure pointer"); + } + + case STRUCTOP_MEMBER: + arg1 = evaluate_subexp_for_address (exp, pos, noside); + arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + + /* With HP aCC, pointers to methods do not point to the function code */ + if (hp_som_som_object_present && + (TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_PTR) && + (TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (arg2))) == TYPE_CODE_METHOD)) + error ("Pointers to methods not supported with HP aCC"); /* 1997-08-19 */ + + mem_offset = value_as_long (arg2); + goto handle_pointer_to_member; + + case STRUCTOP_MPTR: + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + + /* With HP aCC, pointers to methods do not point to the function code */ + if (hp_som_som_object_present && + (TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_PTR) && + (TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (arg2))) == TYPE_CODE_METHOD)) + error ("Pointers to methods not supported with HP aCC"); /* 1997-08-19 */ + + mem_offset = value_as_long (arg2); + +handle_pointer_to_member: + /* HP aCC generates offsets that have bit #29 set; turn it off to get + a real offset to the member. */ + if (hp_som_som_object_present) + { + if (!mem_offset) /* no bias -> really null */ + error ("Attempted dereference of null pointer-to-member"); + mem_offset &= ~0x20000000; + } + if (noside == EVAL_SKIP) + goto nosideret; + type = check_typedef (VALUE_TYPE (arg2)); + if (TYPE_CODE (type) != TYPE_CODE_PTR) + goto bad_pointer_to_member; + type = check_typedef (TYPE_TARGET_TYPE (type)); + if (TYPE_CODE (type) == TYPE_CODE_METHOD) + error ("not implemented: pointer-to-method in pointer-to-member construct"); + if (TYPE_CODE (type) != TYPE_CODE_MEMBER) + goto bad_pointer_to_member; + /* Now, convert these values to an address. */ + arg1 = value_cast (lookup_pointer_type (TYPE_DOMAIN_TYPE (type)), + arg1); + arg3 = value_from_longest (lookup_pointer_type (TYPE_TARGET_TYPE (type)), + value_as_long (arg1) + mem_offset); + return value_ind (arg3); +bad_pointer_to_member: + error("non-pointer-to-member value used in pointer-to-member construct"); + + case BINOP_CONCAT: + arg1 = evaluate_subexp_with_coercion (exp, pos, noside); + arg2 = evaluate_subexp_with_coercion (exp, pos, noside); + if (noside == EVAL_SKIP) + goto nosideret; + if (binop_user_defined_p (op, arg1, arg2)) + return value_x_binop (arg1, arg2, op, OP_NULL, noside); + else + return value_concat (arg1, arg2); + + case BINOP_ASSIGN: + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside); + + /* Do special stuff for HP aCC pointers to members */ + if (hp_som_som_object_present) + { + /* 1997-08-19 Can't assign HP aCC pointers to methods. No details of + the implementation yet; but the pointer appears to point to a code + sequence (thunk) in memory -- in any case it is *not* the address + of the function as it would be in a naive implementation. */ + if ((TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_PTR) && + (TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (arg1))) == TYPE_CODE_METHOD)) + error ("Assignment to pointers to methods not implemented with HP aCC"); + + /* HP aCC pointers to data members require a constant bias */ + if ((TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_PTR) && + (TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (arg1))) == TYPE_CODE_MEMBER)) + { + unsigned int * ptr = (unsigned int *) VALUE_CONTENTS (arg2); /* forces evaluation */ + *ptr |= 0x20000000; /* set 29th bit */ + } + } + + if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS) + return arg1; + if (binop_user_defined_p (op, arg1, arg2)) + return value_x_binop (arg1, arg2, op, OP_NULL, noside); + else + return value_assign (arg1, arg2); + + case BINOP_ASSIGN_MODIFY: + (*pos) += 2; + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside); + if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS) + return arg1; + op = exp->elts[pc + 1].opcode; + if (binop_user_defined_p (op, arg1, arg2)) + return value_x_binop (arg1, arg2, BINOP_ASSIGN_MODIFY, op, noside); + else if (op == BINOP_ADD) + arg2 = value_add (arg1, arg2); + else if (op == BINOP_SUB) + arg2 = value_sub (arg1, arg2); + else + arg2 = value_binop (arg1, arg2, op); + return value_assign (arg1, arg2); + + case BINOP_ADD: + arg1 = evaluate_subexp_with_coercion (exp, pos, noside); + arg2 = evaluate_subexp_with_coercion (exp, pos, noside); + if (noside == EVAL_SKIP) + goto nosideret; + if (binop_user_defined_p (op, arg1, arg2)) + return value_x_binop (arg1, arg2, op, OP_NULL, noside); + else + return value_add (arg1, arg2); + + case BINOP_SUB: + arg1 = evaluate_subexp_with_coercion (exp, pos, noside); + arg2 = evaluate_subexp_with_coercion (exp, pos, noside); + if (noside == EVAL_SKIP) + goto nosideret; + if (binop_user_defined_p (op, arg1, arg2)) + return value_x_binop (arg1, arg2, op, OP_NULL, noside); + else + return value_sub (arg1, arg2); + + case BINOP_MUL: + case BINOP_DIV: + case BINOP_REM: + case BINOP_MOD: + case BINOP_LSH: + case BINOP_RSH: + case BINOP_BITWISE_AND: + case BINOP_BITWISE_IOR: + case BINOP_BITWISE_XOR: + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + if (noside == EVAL_SKIP) + goto nosideret; + if (binop_user_defined_p (op, arg1, arg2)) + return value_x_binop (arg1, arg2, op, OP_NULL, noside); + else + if (noside == EVAL_AVOID_SIDE_EFFECTS + && (op == BINOP_DIV || op == BINOP_REM || op == BINOP_MOD)) + return value_zero (VALUE_TYPE (arg1), not_lval); + else + return value_binop (arg1, arg2, op); + + case BINOP_RANGE: + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + if (noside == EVAL_SKIP) + goto nosideret; + error ("':' operator used in invalid context"); + + case BINOP_SUBSCRIPT: + arg1 = evaluate_subexp_with_coercion (exp, pos, noside); + arg2 = evaluate_subexp_with_coercion (exp, pos, noside); + if (noside == EVAL_SKIP) + goto nosideret; + if (binop_user_defined_p (op, arg1, arg2)) + return value_x_binop (arg1, arg2, op, OP_NULL, noside); + else + { + /* If the user attempts to subscript something that is not an + array or pointer type (like a plain int variable for example), + then report this as an error. */ + + COERCE_REF (arg1); + type = check_typedef (VALUE_TYPE (arg1)); + if (TYPE_CODE (type) != TYPE_CODE_ARRAY + && TYPE_CODE (type) != TYPE_CODE_PTR) + { + if (TYPE_NAME (type)) + error ("cannot subscript something of type `%s'", + TYPE_NAME (type)); + else + error ("cannot subscript requested type"); + } + + if (noside == EVAL_AVOID_SIDE_EFFECTS) + return value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (arg1)); + else + return value_subscript (arg1, arg2); + } + + case BINOP_IN: + arg1 = evaluate_subexp_with_coercion (exp, pos, noside); + arg2 = evaluate_subexp_with_coercion (exp, pos, noside); + if (noside == EVAL_SKIP) + goto nosideret; + return value_in (arg1, arg2); + + case MULTI_SUBSCRIPT: + (*pos) += 2; + nargs = longest_to_int (exp->elts[pc + 1].longconst); + arg1 = evaluate_subexp_with_coercion (exp, pos, noside); + while (nargs-- > 0) + { + arg2 = evaluate_subexp_with_coercion (exp, pos, noside); + /* FIXME: EVAL_SKIP handling may not be correct. */ + if (noside == EVAL_SKIP) + { + if (nargs > 0) + { + continue; + } + else + { + goto nosideret; + } + } + /* FIXME: EVAL_AVOID_SIDE_EFFECTS handling may not be correct. */ + if (noside == EVAL_AVOID_SIDE_EFFECTS) + { + /* If the user attempts to subscript something that has no target + type (like a plain int variable for example), then report this + as an error. */ + + type = TYPE_TARGET_TYPE (check_typedef (VALUE_TYPE (arg1))); + if (type != NULL) + { + arg1 = value_zero (type, VALUE_LVAL (arg1)); + noside = EVAL_SKIP; + continue; + } + else + { + error ("cannot subscript something of type `%s'", + TYPE_NAME (VALUE_TYPE (arg1))); + } + } + + if (binop_user_defined_p (op, arg1, arg2)) + { + arg1 = value_x_binop (arg1, arg2, op, OP_NULL, noside); + } + else + { + arg1 = value_subscript (arg1, arg2); + } + } + return (arg1); + + multi_f77_subscript: + { + int subscript_array[MAX_FORTRAN_DIMS+1]; /* 1-based array of + subscripts, max == 7 */ + int array_size_array[MAX_FORTRAN_DIMS+1]; + int ndimensions=1,i; + struct type *tmp_type; + int offset_item; /* The array offset where the item lives */ + + if (nargs > MAX_FORTRAN_DIMS) + error ("Too many subscripts for F77 (%d Max)", MAX_FORTRAN_DIMS); + + tmp_type = check_typedef (VALUE_TYPE (arg1)); + ndimensions = calc_f77_array_dims (type); + + if (nargs != ndimensions) + error ("Wrong number of subscripts"); + + /* Now that we know we have a legal array subscript expression + let us actually find out where this element exists in the array. */ + + offset_item = 0; + for (i = 1; i <= nargs; i++) + { + /* Evaluate each subscript, It must be a legal integer in F77 */ + arg2 = evaluate_subexp_with_coercion (exp, pos, noside); + + /* Fill in the subscript and array size arrays */ + + subscript_array[i] = value_as_long (arg2); + + retcode = f77_get_dynamic_upperbound (tmp_type, &upper); + if (retcode == BOUND_FETCH_ERROR) + error ("Cannot obtain dynamic upper bound"); + + retcode = f77_get_dynamic_lowerbound (tmp_type, &lower); + if (retcode == BOUND_FETCH_ERROR) + error("Cannot obtain dynamic lower bound"); + + array_size_array[i] = upper - lower + 1; + + /* Zero-normalize subscripts so that offsetting will work. */ + + subscript_array[i] -= lower; + + /* If we are at the bottom of a multidimensional + array type then keep a ptr to the last ARRAY + type around for use when calling value_subscript() + below. This is done because we pretend to value_subscript + that we actually have a one-dimensional array + of base element type that we apply a simple + offset to. */ + + if (i < nargs) + tmp_type = check_typedef (TYPE_TARGET_TYPE (tmp_type)); + } + + /* Now let us calculate the offset for this item */ + + offset_item = subscript_array[ndimensions]; + + for (i = ndimensions - 1; i >= 1; i--) + offset_item = + array_size_array[i] * offset_item + subscript_array[i]; + + /* Construct a value node with the value of the offset */ + + arg2 = value_from_longest (builtin_type_f_integer, offset_item); + + /* Let us now play a dirty trick: we will take arg1 + which is a value node pointing to the topmost level + of the multidimensional array-set and pretend + that it is actually a array of the final element + type, this will ensure that value_subscript() + returns the correct type value */ + + VALUE_TYPE (arg1) = tmp_type; + return value_ind (value_add (value_coerce_array (arg1), arg2)); + } + + case BINOP_LOGICAL_AND: + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + if (noside == EVAL_SKIP) + { + arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + goto nosideret; + } + + oldpos = *pos; + arg2 = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS); + *pos = oldpos; + + if (binop_user_defined_p (op, arg1, arg2)) + { + arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + return value_x_binop (arg1, arg2, op, OP_NULL, noside); + } + else + { + tem = value_logical_not (arg1); + arg2 = evaluate_subexp (NULL_TYPE, exp, pos, + (tem ? EVAL_SKIP : noside)); + return value_from_longest (LA_BOOL_TYPE, + (LONGEST) (!tem && !value_logical_not (arg2))); + } + + case BINOP_LOGICAL_OR: + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + if (noside == EVAL_SKIP) + { + arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + goto nosideret; + } + + oldpos = *pos; + arg2 = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS); + *pos = oldpos; + + if (binop_user_defined_p (op, arg1, arg2)) + { + arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + return value_x_binop (arg1, arg2, op, OP_NULL, noside); + } + else + { + tem = value_logical_not (arg1); + arg2 = evaluate_subexp (NULL_TYPE, exp, pos, + (!tem ? EVAL_SKIP : noside)); + return value_from_longest (LA_BOOL_TYPE, + (LONGEST) (!tem || !value_logical_not (arg2))); + } + + case BINOP_EQUAL: + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside); + if (noside == EVAL_SKIP) + goto nosideret; + if (binop_user_defined_p (op, arg1, arg2)) + { + return value_x_binop (arg1, arg2, op, OP_NULL, noside); + } + else + { + tem = value_equal (arg1, arg2); + return value_from_longest (LA_BOOL_TYPE, (LONGEST) tem); + } + + case BINOP_NOTEQUAL: + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside); + if (noside == EVAL_SKIP) + goto nosideret; + if (binop_user_defined_p (op, arg1, arg2)) + { + return value_x_binop (arg1, arg2, op, OP_NULL, noside); + } + else + { + tem = value_equal (arg1, arg2); + return value_from_longest (LA_BOOL_TYPE, (LONGEST) ! tem); + } + + case BINOP_LESS: + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside); + if (noside == EVAL_SKIP) + goto nosideret; + if (binop_user_defined_p (op, arg1, arg2)) + { + return value_x_binop (arg1, arg2, op, OP_NULL, noside); + } + else + { + tem = value_less (arg1, arg2); + return value_from_longest (LA_BOOL_TYPE, (LONGEST) tem); + } + + case BINOP_GTR: + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside); + if (noside == EVAL_SKIP) + goto nosideret; + if (binop_user_defined_p (op, arg1, arg2)) + { + return value_x_binop (arg1, arg2, op, OP_NULL, noside); + } + else + { + tem = value_less (arg2, arg1); + return value_from_longest (LA_BOOL_TYPE, (LONGEST) tem); + } + + case BINOP_GEQ: + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside); + if (noside == EVAL_SKIP) + goto nosideret; + if (binop_user_defined_p (op, arg1, arg2)) + { + return value_x_binop (arg1, arg2, op, OP_NULL, noside); + } + else + { + tem = value_less (arg2, arg1) || value_equal (arg1, arg2); + return value_from_longest (LA_BOOL_TYPE, (LONGEST) tem); + } + + case BINOP_LEQ: + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + arg2 = evaluate_subexp (VALUE_TYPE (arg1), exp, pos, noside); + if (noside == EVAL_SKIP) + goto nosideret; + if (binop_user_defined_p (op, arg1, arg2)) + { + return value_x_binop (arg1, arg2, op, OP_NULL, noside); + } + else + { + tem = value_less (arg1, arg2) || value_equal (arg1, arg2); + return value_from_longest (LA_BOOL_TYPE, (LONGEST) tem); + } + + case BINOP_REPEAT: + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + if (noside == EVAL_SKIP) + goto nosideret; + type = check_typedef (VALUE_TYPE (arg2)); + if (TYPE_CODE (type) != TYPE_CODE_INT) + error ("Non-integral right operand for \"@\" operator."); + if (noside == EVAL_AVOID_SIDE_EFFECTS) + { + return allocate_repeat_value (VALUE_TYPE (arg1), + longest_to_int (value_as_long (arg2))); + } + else + return value_repeat (arg1, longest_to_int (value_as_long (arg2))); + + case BINOP_COMMA: + evaluate_subexp (NULL_TYPE, exp, pos, noside); + return evaluate_subexp (NULL_TYPE, exp, pos, noside); + + case UNOP_NEG: + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + if (noside == EVAL_SKIP) + goto nosideret; + if (unop_user_defined_p (op, arg1)) + return value_x_unop (arg1, op, noside); + else + return value_neg (arg1); + + case UNOP_COMPLEMENT: + /* C++: check for and handle destructor names. */ + op = exp->elts[*pos].opcode; + + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + if (noside == EVAL_SKIP) + goto nosideret; + if (unop_user_defined_p (UNOP_COMPLEMENT, arg1)) + return value_x_unop (arg1, UNOP_COMPLEMENT, noside); + else + return value_complement (arg1); + + case UNOP_LOGICAL_NOT: + arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); + if (noside == EVAL_SKIP) + goto nosideret; + if (unop_user_defined_p (op, arg1)) + return value_x_unop (arg1, op, noside); + else + return value_from_longest (LA_BOOL_TYPE, + (LONGEST) value_logical_not (arg1)); + + case UNOP_IND: + if (expect_type && TYPE_CODE (expect_type) == TYPE_CODE_PTR) + expect_type = TYPE_TARGET_TYPE (check_typedef (expect_type)); + arg1 = evaluate_subexp (expect_type, exp, pos, noside); + if ((TYPE_TARGET_TYPE (VALUE_TYPE (arg1))) && + ((TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (arg1))) == TYPE_CODE_METHOD) || + (TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (arg1))) == TYPE_CODE_MEMBER))) + error ("Attempt to dereference pointer to member without an object"); + if (noside == EVAL_SKIP) + goto nosideret; + if (unop_user_defined_p (op, arg1)) + return value_x_unop (arg1, op, noside); + else if (noside == EVAL_AVOID_SIDE_EFFECTS) + { + type = check_typedef (VALUE_TYPE (arg1)); + if (TYPE_CODE (type) == TYPE_CODE_PTR + || TYPE_CODE (type) == TYPE_CODE_REF + /* In C you can dereference an array to get the 1st elt. */ + || TYPE_CODE (type) == TYPE_CODE_ARRAY + ) + return value_zero (TYPE_TARGET_TYPE (type), + lval_memory); + else if (TYPE_CODE (type) == TYPE_CODE_INT) + /* GDB allows dereferencing an int. */ + return value_zero (builtin_type_int, lval_memory); + else + error ("Attempt to take contents of a non-pointer value."); + } + return value_ind (arg1); + + case UNOP_ADDR: + /* C++: check for and handle pointer to members. */ + + op = exp->elts[*pos].opcode; + + if (noside == EVAL_SKIP) + { + if (op == OP_SCOPE) + { + int temm = longest_to_int (exp->elts[pc+3].longconst); + (*pos) += 3 + BYTES_TO_EXP_ELEM (temm + 1); + } + else + evaluate_subexp (expect_type, exp, pos, EVAL_SKIP); + goto nosideret; + } + else + { + value_ptr retvalp = evaluate_subexp_for_address (exp, pos, noside); + /* If HP aCC object, use bias for pointers to members */ + if (hp_som_som_object_present && + (TYPE_CODE (VALUE_TYPE (retvalp)) == TYPE_CODE_PTR) && + (TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (retvalp))) == TYPE_CODE_MEMBER)) + { + unsigned int * ptr = (unsigned int *) VALUE_CONTENTS (retvalp); /* forces evaluation */ + *ptr |= 0x20000000; /* set 29th bit */ + } + return retvalp; + } + + case UNOP_SIZEOF: + if (noside == EVAL_SKIP) + { + evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP); + goto nosideret; + } + return evaluate_subexp_for_sizeof (exp, pos); + + case UNOP_CAST: + (*pos) += 2; + type = exp->elts[pc + 1].type; + arg1 = evaluate_subexp (type, exp, pos, noside); + if (noside == EVAL_SKIP) + goto nosideret; + if (type != VALUE_TYPE (arg1)) + arg1 = value_cast (type, arg1); + return arg1; + + case UNOP_MEMVAL: + (*pos) += 2; + arg1 = evaluate_subexp (expect_type, exp, pos, noside); + if (noside == EVAL_SKIP) + goto nosideret; + if (noside == EVAL_AVOID_SIDE_EFFECTS) + return value_zero (exp->elts[pc + 1].type, lval_memory); + else + return value_at_lazy (exp->elts[pc + 1].type, + value_as_pointer (arg1), + NULL); + + case UNOP_PREINCREMENT: + arg1 = evaluate_subexp (expect_type, exp, pos, noside); + if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS) + return arg1; + else if (unop_user_defined_p (op, arg1)) + { + return value_x_unop (arg1, op, noside); + } + else + { + arg2 = value_add (arg1, value_from_longest (builtin_type_char, + (LONGEST) 1)); + return value_assign (arg1, arg2); + } + + case UNOP_PREDECREMENT: + arg1 = evaluate_subexp (expect_type, exp, pos, noside); + if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS) + return arg1; + else if (unop_user_defined_p (op, arg1)) + { + return value_x_unop (arg1, op, noside); + } + else + { + arg2 = value_sub (arg1, value_from_longest (builtin_type_char, + (LONGEST) 1)); + return value_assign (arg1, arg2); + } + + case UNOP_POSTINCREMENT: + arg1 = evaluate_subexp (expect_type, exp, pos, noside); + if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS) + return arg1; + else if (unop_user_defined_p (op, arg1)) + { + return value_x_unop (arg1, op, noside); + } + else + { + arg2 = value_add (arg1, value_from_longest (builtin_type_char, + (LONGEST) 1)); + value_assign (arg1, arg2); + return arg1; + } + + case UNOP_POSTDECREMENT: + arg1 = evaluate_subexp (expect_type, exp, pos, noside); + if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS) + return arg1; + else if (unop_user_defined_p (op, arg1)) + { + return value_x_unop (arg1, op, noside); + } + else + { + arg2 = value_sub (arg1, value_from_longest (builtin_type_char, + (LONGEST) 1)); + value_assign (arg1, arg2); + return arg1; + } + + case OP_THIS: + (*pos) += 1; + return value_of_this (1); + + case OP_TYPE: + error ("Attempt to use a type name as an expression"); + + default: + /* Removing this case and compiling with gcc -Wall reveals that + a lot of cases are hitting this case. Some of these should + probably be removed from expression.h (e.g. do we need a BINOP_SCOPE + and an OP_SCOPE?); others are legitimate expressions which are + (apparently) not fully implemented. + + If there are any cases landing here which mean a user error, + then they should be separate cases, with more descriptive + error messages. */ + + error ("\ +GDB does not (yet) know how to evaluate that kind of expression"); + } + + nosideret: + return value_from_longest (builtin_type_long, (LONGEST) 1); +} + +/* Evaluate a subexpression of EXP, at index *POS, + and return the address of that subexpression. + Advance *POS over the subexpression. + If the subexpression isn't an lvalue, get an error. + NOSIDE may be EVAL_AVOID_SIDE_EFFECTS; + then only the type of the result need be correct. */ + +static value_ptr +evaluate_subexp_for_address (exp, pos, noside) + register struct expression *exp; + register int *pos; + enum noside noside; +{ + enum exp_opcode op; + register int pc; + struct symbol *var; + + pc = (*pos); + op = exp->elts[pc].opcode; + + switch (op) + { + case UNOP_IND: + (*pos)++; + return evaluate_subexp (NULL_TYPE, exp, pos, noside); + + case UNOP_MEMVAL: + (*pos) += 3; + return value_cast (lookup_pointer_type (exp->elts[pc + 1].type), + evaluate_subexp (NULL_TYPE, exp, pos, noside)); + + case OP_VAR_VALUE: + var = exp->elts[pc + 2].symbol; + + /* C++: The "address" of a reference should yield the address + * of the object pointed to. Let value_addr() deal with it. */ + if (TYPE_CODE (SYMBOL_TYPE (var)) == TYPE_CODE_REF) + goto default_case; + + (*pos) += 4; + if (noside == EVAL_AVOID_SIDE_EFFECTS) + { + struct type *type = + lookup_pointer_type (SYMBOL_TYPE (var)); + enum address_class sym_class = SYMBOL_CLASS (var); + + if (sym_class == LOC_CONST + || sym_class == LOC_CONST_BYTES + || sym_class == LOC_REGISTER + || sym_class == LOC_REGPARM) + error ("Attempt to take address of register or constant."); + + return + value_zero (type, not_lval); + } + else + return + locate_var_value + (var, + block_innermost_frame (exp->elts[pc + 1].block)); + + default: + default_case: + if (noside == EVAL_AVOID_SIDE_EFFECTS) + { + value_ptr x = evaluate_subexp (NULL_TYPE, exp, pos, noside); + if (VALUE_LVAL (x) == lval_memory) + return value_zero (lookup_pointer_type (VALUE_TYPE (x)), + not_lval); + else + error ("Attempt to take address of non-lval"); + } + return value_addr (evaluate_subexp (NULL_TYPE, exp, pos, noside)); + } +} + +/* Evaluate like `evaluate_subexp' except coercing arrays to pointers. + When used in contexts where arrays will be coerced anyway, this is + equivalent to `evaluate_subexp' but much faster because it avoids + actually fetching array contents (perhaps obsolete now that we have + VALUE_LAZY). + + Note that we currently only do the coercion for C expressions, where + arrays are zero based and the coercion is correct. For other languages, + with nonzero based arrays, coercion loses. Use CAST_IS_CONVERSION + to decide if coercion is appropriate. + + */ + +value_ptr +evaluate_subexp_with_coercion (exp, pos, noside) + register struct expression *exp; + register int *pos; + enum noside noside; +{ + register enum exp_opcode op; + register int pc; + register value_ptr val; + struct symbol *var; + + pc = (*pos); + op = exp->elts[pc].opcode; + + switch (op) + { + case OP_VAR_VALUE: + var = exp->elts[pc + 2].symbol; + if (TYPE_CODE (check_typedef (SYMBOL_TYPE (var))) == TYPE_CODE_ARRAY + && CAST_IS_CONVERSION) + { + (*pos) += 4; + val = + locate_var_value + (var, block_innermost_frame (exp->elts[pc + 1].block)); + return value_cast (lookup_pointer_type (TYPE_TARGET_TYPE (SYMBOL_TYPE (var))), + val); + } + /* FALLTHROUGH */ + + default: + return evaluate_subexp (NULL_TYPE, exp, pos, noside); + } +} + +/* Evaluate a subexpression of EXP, at index *POS, + and return a value for the size of that subexpression. + Advance *POS over the subexpression. */ + +static value_ptr +evaluate_subexp_for_sizeof (exp, pos) + register struct expression *exp; + register int *pos; +{ + enum exp_opcode op; + register int pc; + struct type *type; + value_ptr val; + + pc = (*pos); + op = exp->elts[pc].opcode; + + switch (op) + { + /* This case is handled specially + so that we avoid creating a value for the result type. + If the result type is very big, it's desirable not to + create a value unnecessarily. */ + case UNOP_IND: + (*pos)++; + val = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS); + type = check_typedef (VALUE_TYPE (val)); + if (TYPE_CODE (type) != TYPE_CODE_PTR + && TYPE_CODE (type) != TYPE_CODE_REF + && TYPE_CODE (type) != TYPE_CODE_ARRAY) + error ("Attempt to take contents of a non-pointer value."); + type = check_typedef (TYPE_TARGET_TYPE (type)); + return value_from_longest (builtin_type_int, (LONGEST) + TYPE_LENGTH (type)); + + case UNOP_MEMVAL: + (*pos) += 3; + type = check_typedef (exp->elts[pc + 1].type); + return value_from_longest (builtin_type_int, + (LONGEST) TYPE_LENGTH (type)); + + case OP_VAR_VALUE: + (*pos) += 4; + type = check_typedef (SYMBOL_TYPE (exp->elts[pc + 2].symbol)); + return + value_from_longest (builtin_type_int, (LONGEST) TYPE_LENGTH (type)); + + default: + val = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS); + return value_from_longest (builtin_type_int, + (LONGEST) TYPE_LENGTH (VALUE_TYPE (val))); + } +} + +/* Parse a type expression in the string [P..P+LENGTH). */ + +struct type * +parse_and_eval_type (p, length) + char *p; + int length; +{ + char *tmp = (char *)alloca (length + 4); + struct expression *expr; + tmp[0] = '('; + memcpy (tmp+1, p, length); + tmp[length+1] = ')'; + tmp[length+2] = '0'; + tmp[length+3] = '\0'; + expr = parse_expression (tmp); + if (expr->elts[0].opcode != UNOP_CAST) + error ("Internal error in eval_type."); + return expr->elts[1].type; +} + +int +calc_f77_array_dims (array_type) + struct type *array_type; +{ + int ndimen = 1; + struct type *tmp_type; + + if ((TYPE_CODE(array_type) != TYPE_CODE_ARRAY)) + error ("Can't get dimensions for a non-array type"); + + tmp_type = array_type; + + while ((tmp_type = TYPE_TARGET_TYPE (tmp_type))) + { + if (TYPE_CODE (tmp_type) == TYPE_CODE_ARRAY) + ++ndimen; + } + return ndimen; +} |