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-rw-r--r--gdb/valarith.c694
1 files changed, 694 insertions, 0 deletions
diff --git a/gdb/valarith.c b/gdb/valarith.c
new file mode 100644
index 0000000..6269def
--- /dev/null
+++ b/gdb/valarith.c
@@ -0,0 +1,694 @@
+/* Perform arithmetic and other operations on values, for GDB.
+ Copyright (C) 1986, 1989 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+GDB 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 1, or (at your option)
+any later version.
+
+GDB 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 GDB; see the file COPYING. If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "defs.h"
+#include "param.h"
+#include "value.h"
+#include "expression.h"
+#include "target.h"
+#include <string.h>
+
+
+value value_x_binop ();
+value value_subscripted_rvalue ();
+
+value
+value_add (arg1, arg2)
+ value arg1, arg2;
+{
+ register value val, valint, valptr;
+ register int len;
+
+ COERCE_ARRAY (arg1);
+ COERCE_ARRAY (arg2);
+
+ if ((TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_PTR
+ || TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_PTR)
+ &&
+ (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_INT
+ || TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_INT))
+ /* Exactly one argument is a pointer, and one is an integer. */
+ {
+ if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_PTR)
+ {
+ valptr = arg1;
+ valint = arg2;
+ }
+ else
+ {
+ valptr = arg2;
+ valint = arg1;
+ }
+ len = TYPE_LENGTH (TYPE_TARGET_TYPE (VALUE_TYPE (valptr)));
+ if (len == 0) len = 1; /* For (void *) */
+ val = value_from_long (builtin_type_long,
+ value_as_long (valptr)
+ + (len * value_as_long (valint)));
+ VALUE_TYPE (val) = VALUE_TYPE (valptr);
+ return val;
+ }
+
+ return value_binop (arg1, arg2, BINOP_ADD);
+}
+
+value
+value_sub (arg1, arg2)
+ value arg1, arg2;
+{
+ register value val;
+
+ COERCE_ARRAY (arg1);
+ COERCE_ARRAY (arg2);
+
+ if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_PTR)
+ {
+ if (TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_INT)
+ {
+ /* pointer - integer. */
+ val = value_from_long
+ (builtin_type_long,
+ value_as_long (arg1)
+ - (TYPE_LENGTH (TYPE_TARGET_TYPE (VALUE_TYPE (arg1)))
+ * value_as_long (arg2)));
+ VALUE_TYPE (val) = VALUE_TYPE (arg1);
+ return val;
+ }
+ else if (VALUE_TYPE (arg1) == VALUE_TYPE (arg2))
+ {
+ /* pointer to <type x> - pointer to <type x>. */
+ val = value_from_long
+ (builtin_type_long,
+ (value_as_long (arg1) - value_as_long (arg2))
+ / TYPE_LENGTH (TYPE_TARGET_TYPE (VALUE_TYPE (arg1))));
+ return val;
+ }
+ else
+ {
+ error ("\
+First argument of `-' is a pointer and second argument is neither\n\
+an integer nor a pointer of the same type.");
+ }
+ }
+
+ return value_binop (arg1, arg2, BINOP_SUB);
+}
+
+/* Return the value of ARRAY[IDX]. */
+
+value
+value_subscript (array, idx)
+ value array, idx;
+{
+ if (TYPE_CODE (VALUE_TYPE (array)) == TYPE_CODE_ARRAY
+ && VALUE_LVAL (array) != lval_memory)
+ return value_subscripted_rvalue (array, idx);
+ else
+ return value_ind (value_add (array, idx));
+}
+
+/* Return the value of EXPR[IDX], expr an aggregate rvalue
+ (eg, a vector register). This routine used to promote floats
+ to doubles, but no longer does. */
+
+value
+value_subscripted_rvalue (array, idx)
+ value array, idx;
+{
+ struct type *elt_type = TYPE_TARGET_TYPE (VALUE_TYPE (array));
+ int elt_size = TYPE_LENGTH (elt_type);
+ int elt_offs = elt_size * value_as_long (idx);
+ value v;
+
+ if (elt_offs >= TYPE_LENGTH (VALUE_TYPE (array)))
+ error ("no such vector element");
+
+ v = allocate_value (elt_type);
+ bcopy (VALUE_CONTENTS (array) + elt_offs, VALUE_CONTENTS (v), elt_size);
+
+ if (VALUE_LVAL (array) == lval_internalvar)
+ VALUE_LVAL (v) = lval_internalvar_component;
+ else
+ VALUE_LVAL (v) = not_lval;
+ VALUE_ADDRESS (v) = VALUE_ADDRESS (array);
+ VALUE_OFFSET (v) = VALUE_OFFSET (array) + elt_offs;
+ VALUE_BITSIZE (v) = elt_size * 8;
+ return v;
+}
+
+/* Check to see if either argument is a structure. This is called so
+ we know whether to go ahead with the normal binop or look for a
+ user defined function instead.
+
+ For now, we do not overload the `=' operator. */
+
+int
+binop_user_defined_p (op, arg1, arg2)
+ enum exp_opcode op;
+ value arg1, arg2;
+{
+ if (op == BINOP_ASSIGN)
+ return 0;
+ return (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_STRUCT
+ || TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_STRUCT
+ || (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_REF
+ && TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (arg1))) == TYPE_CODE_STRUCT)
+ || (TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_REF
+ && TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (arg2))) == TYPE_CODE_STRUCT));
+}
+
+/* Check to see if argument is a structure. This is called so
+ we know whether to go ahead with the normal unop or look for a
+ user defined function instead.
+
+ For now, we do not overload the `&' operator. */
+
+int unop_user_defined_p (op, arg1)
+ enum exp_opcode op;
+ value arg1;
+{
+ if (op == UNOP_ADDR)
+ return 0;
+ return (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_STRUCT
+ || (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_REF
+ && TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (arg1))) == TYPE_CODE_STRUCT));
+}
+
+/* We know either arg1 or arg2 is a structure, so try to find the right
+ user defined function. Create an argument vector that calls
+ arg1.operator @ (arg1,arg2) and return that value (where '@' is any
+ binary operator which is legal for GNU C++). */
+
+value
+value_x_binop (arg1, arg2, op, otherop)
+ value arg1, arg2;
+ enum exp_opcode op, otherop;
+{
+ value * argvec;
+ char *ptr;
+ char tstr[13];
+ int static_memfuncp;
+
+ COERCE_ENUM (arg1);
+ COERCE_ENUM (arg2);
+
+ /* now we know that what we have to do is construct our
+ arg vector and find the right function to call it with. */
+
+ if (TYPE_CODE (VALUE_TYPE (arg1)) != TYPE_CODE_STRUCT)
+ error ("Can't do that binary op on that type"); /* FIXME be explicit */
+
+ argvec = (value *) alloca (sizeof (value) * 4);
+ argvec[1] = value_addr (arg1);
+ argvec[2] = arg2;
+ argvec[3] = 0;
+
+ /* make the right function name up */
+ strcpy(tstr, "operator__");
+ ptr = tstr+8;
+ switch (op)
+ {
+ case BINOP_ADD: strcpy(ptr,"+"); break;
+ case BINOP_SUB: strcpy(ptr,"-"); break;
+ case BINOP_MUL: strcpy(ptr,"*"); break;
+ case BINOP_DIV: strcpy(ptr,"/"); break;
+ case BINOP_REM: strcpy(ptr,"%"); break;
+ case BINOP_LSH: strcpy(ptr,"<<"); break;
+ case BINOP_RSH: strcpy(ptr,">>"); break;
+ case BINOP_LOGAND: strcpy(ptr,"&"); break;
+ case BINOP_LOGIOR: strcpy(ptr,"|"); break;
+ case BINOP_LOGXOR: strcpy(ptr,"^"); break;
+ case BINOP_AND: strcpy(ptr,"&&"); break;
+ case BINOP_OR: strcpy(ptr,"||"); break;
+ case BINOP_MIN: strcpy(ptr,"<?"); break;
+ case BINOP_MAX: strcpy(ptr,">?"); break;
+ case BINOP_ASSIGN: strcpy(ptr,"="); break;
+ case BINOP_ASSIGN_MODIFY:
+ switch (otherop)
+ {
+ case BINOP_ADD: strcpy(ptr,"+="); break;
+ case BINOP_SUB: strcpy(ptr,"-="); break;
+ case BINOP_MUL: strcpy(ptr,"*="); break;
+ case BINOP_DIV: strcpy(ptr,"/="); break;
+ case BINOP_REM: strcpy(ptr,"%="); break;
+ case BINOP_LOGAND: strcpy(ptr,"&="); break;
+ case BINOP_LOGIOR: strcpy(ptr,"|="); break;
+ case BINOP_LOGXOR: strcpy(ptr,"^="); break;
+ default:
+ error ("Invalid binary operation specified.");
+ }
+ break;
+ case BINOP_SUBSCRIPT: strcpy(ptr,"[]"); break;
+ case BINOP_EQUAL: strcpy(ptr,"=="); break;
+ case BINOP_NOTEQUAL: strcpy(ptr,"!="); break;
+ case BINOP_LESS: strcpy(ptr,"<"); break;
+ case BINOP_GTR: strcpy(ptr,">"); break;
+ case BINOP_GEQ: strcpy(ptr,">="); break;
+ case BINOP_LEQ: strcpy(ptr,"<="); break;
+ default:
+ error ("Invalid binary operation specified.");
+ }
+ argvec[0] = value_struct_elt (&arg1, argvec+1, tstr, &static_memfuncp, "structure");
+ if (argvec[0])
+ {
+ if (static_memfuncp)
+ {
+ argvec[1] = argvec[0];
+ argvec++;
+ }
+ return target_call_function (argvec[0], 2 - static_memfuncp, argvec + 1);
+ }
+ error ("member function %s not found", tstr);
+#ifdef lint
+ return target_call_function (argvec[0], 2 - static_memfuncp, argvec + 1);
+#endif
+}
+
+/* We know that arg1 is a structure, so try to find a unary user
+ defined operator that matches the operator in question.
+ Create an argument vector that calls arg1.operator @ (arg1)
+ and return that value (where '@' is (almost) any unary operator which
+ is legal for GNU C++). */
+
+value
+value_x_unop (arg1, op)
+ value arg1;
+ enum exp_opcode op;
+{
+ value * argvec;
+ char *ptr;
+ char tstr[13];
+ int static_memfuncp;
+
+ COERCE_ENUM (arg1);
+
+ /* now we know that what we have to do is construct our
+ arg vector and find the right function to call it with. */
+
+ if (TYPE_CODE (VALUE_TYPE (arg1)) != TYPE_CODE_STRUCT)
+ error ("Can't do that unary op on that type"); /* FIXME be explicit */
+
+ argvec = (value *) alloca (sizeof (value) * 3);
+ argvec[1] = value_addr (arg1);
+ argvec[2] = 0;
+
+ /* make the right function name up */
+ strcpy(tstr,"operator__");
+ ptr = tstr+8;
+ switch (op)
+ {
+ case UNOP_PREINCREMENT: strcpy(ptr,"++"); break;
+ case UNOP_PREDECREMENT: strcpy(ptr,"++"); break;
+ case UNOP_POSTINCREMENT: strcpy(ptr,"++"); break;
+ case UNOP_POSTDECREMENT: strcpy(ptr,"++"); break;
+ case UNOP_ZEROP: strcpy(ptr,"!"); break;
+ case UNOP_LOGNOT: strcpy(ptr,"~"); break;
+ case UNOP_NEG: strcpy(ptr,"-"); break;
+ default:
+ error ("Invalid binary operation specified.");
+ }
+ argvec[0] = value_struct_elt (&arg1, argvec+1, tstr, &static_memfuncp, "structure");
+ if (argvec[0])
+ {
+ if (static_memfuncp)
+ {
+ argvec[1] = argvec[0];
+ argvec++;
+ }
+ return target_call_function (argvec[0], 1 - static_memfuncp, argvec + 1);
+ }
+ error ("member function %s not found", tstr);
+ return 0; /* For lint -- never reached */
+}
+
+/* Perform a binary operation on two integers or two floats.
+ Does not support addition and subtraction on pointers;
+ use value_add or value_sub if you want to handle those possibilities. */
+
+value
+value_binop (arg1, arg2, op)
+ value arg1, arg2;
+ int op;
+{
+ register value val;
+
+ COERCE_ENUM (arg1);
+ COERCE_ENUM (arg2);
+
+ if ((TYPE_CODE (VALUE_TYPE (arg1)) != TYPE_CODE_FLT
+ &&
+ TYPE_CODE (VALUE_TYPE (arg1)) != TYPE_CODE_INT)
+ ||
+ (TYPE_CODE (VALUE_TYPE (arg2)) != TYPE_CODE_FLT
+ &&
+ TYPE_CODE (VALUE_TYPE (arg2)) != TYPE_CODE_INT))
+ error ("Argument to arithmetic operation not a number.");
+
+ if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_FLT
+ ||
+ TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_FLT)
+ {
+ double v1, v2, v;
+ v1 = value_as_double (arg1);
+ v2 = value_as_double (arg2);
+ switch (op)
+ {
+ case BINOP_ADD:
+ v = v1 + v2;
+ break;
+
+ case BINOP_SUB:
+ v = v1 - v2;
+ break;
+
+ case BINOP_MUL:
+ v = v1 * v2;
+ break;
+
+ case BINOP_DIV:
+ v = v1 / v2;
+ break;
+
+ default:
+ error ("Integer-only operation on floating point number.");
+ }
+
+ val = allocate_value (builtin_type_double);
+ SWAP_TARGET_AND_HOST (&v, sizeof (v));
+ *(double *) VALUE_CONTENTS_RAW (val) = v;
+ }
+ else
+ /* Integral operations here. */
+ {
+ /* Should we promote to unsigned longest? */
+ if ((TYPE_UNSIGNED (VALUE_TYPE (arg1))
+ || TYPE_UNSIGNED (VALUE_TYPE (arg2)))
+ && (TYPE_LENGTH (VALUE_TYPE (arg1)) >= sizeof (unsigned LONGEST)
+ || TYPE_LENGTH (VALUE_TYPE (arg1)) >= sizeof (unsigned LONGEST)))
+ {
+ unsigned LONGEST v1, v2, v;
+ v1 = (unsigned LONGEST) value_as_long (arg1);
+ v2 = (unsigned LONGEST) value_as_long (arg2);
+
+ switch (op)
+ {
+ case BINOP_ADD:
+ v = v1 + v2;
+ break;
+
+ case BINOP_SUB:
+ v = v1 - v2;
+ break;
+
+ case BINOP_MUL:
+ v = v1 * v2;
+ break;
+
+ case BINOP_DIV:
+ v = v1 / v2;
+ break;
+
+ case BINOP_REM:
+ v = v1 % v2;
+ break;
+
+ case BINOP_LSH:
+ v = v1 << v2;
+ break;
+
+ case BINOP_RSH:
+ v = v1 >> v2;
+ break;
+
+ case BINOP_LOGAND:
+ v = v1 & v2;
+ break;
+
+ case BINOP_LOGIOR:
+ v = v1 | v2;
+ break;
+
+ case BINOP_LOGXOR:
+ v = v1 ^ v2;
+ break;
+
+ case BINOP_AND:
+ v = v1 && v2;
+ break;
+
+ case BINOP_OR:
+ v = v1 || v2;
+ break;
+
+ case BINOP_MIN:
+ v = v1 < v2 ? v1 : v2;
+ break;
+
+ case BINOP_MAX:
+ v = v1 > v2 ? v1 : v2;
+ break;
+
+ default:
+ error ("Invalid binary operation on numbers.");
+ }
+
+ val = allocate_value (BUILTIN_TYPE_UNSIGNED_LONGEST);
+ SWAP_TARGET_AND_HOST (&v, sizeof (v));
+ *(unsigned LONGEST *) VALUE_CONTENTS_RAW (val) = v;
+ }
+ else
+ {
+ LONGEST v1, v2, v;
+ v1 = value_as_long (arg1);
+ v2 = value_as_long (arg2);
+
+ switch (op)
+ {
+ case BINOP_ADD:
+ v = v1 + v2;
+ break;
+
+ case BINOP_SUB:
+ v = v1 - v2;
+ break;
+
+ case BINOP_MUL:
+ v = v1 * v2;
+ break;
+
+ case BINOP_DIV:
+ v = v1 / v2;
+ break;
+
+ case BINOP_REM:
+ v = v1 % v2;
+ break;
+
+ case BINOP_LSH:
+ v = v1 << v2;
+ break;
+
+ case BINOP_RSH:
+ v = v1 >> v2;
+ break;
+
+ case BINOP_LOGAND:
+ v = v1 & v2;
+ break;
+
+ case BINOP_LOGIOR:
+ v = v1 | v2;
+ break;
+
+ case BINOP_LOGXOR:
+ v = v1 ^ v2;
+ break;
+
+ case BINOP_AND:
+ v = v1 && v2;
+ break;
+
+ case BINOP_OR:
+ v = v1 || v2;
+ break;
+
+ case BINOP_MIN:
+ v = v1 < v2 ? v1 : v2;
+ break;
+
+ case BINOP_MAX:
+ v = v1 > v2 ? v1 : v2;
+ break;
+
+ default:
+ error ("Invalid binary operation on numbers.");
+ }
+
+ val = allocate_value (BUILTIN_TYPE_LONGEST);
+ SWAP_TARGET_AND_HOST (&v, sizeof (v));
+ *(LONGEST *) VALUE_CONTENTS_RAW (val) = v;
+ }
+ }
+
+ return val;
+}
+
+/* Simulate the C operator ! -- return 1 if ARG1 contains zeros. */
+
+int
+value_zerop (arg1)
+ value arg1;
+{
+ register int len;
+ register char *p;
+
+ COERCE_ARRAY (arg1);
+
+ len = TYPE_LENGTH (VALUE_TYPE (arg1));
+ p = VALUE_CONTENTS (arg1);
+
+ while (--len >= 0)
+ {
+ if (*p++)
+ break;
+ }
+
+ return len < 0;
+}
+
+/* Simulate the C operator == by returning a 1
+ iff ARG1 and ARG2 have equal contents. */
+
+int
+value_equal (arg1, arg2)
+ register value arg1, arg2;
+
+{
+ register int len;
+ register char *p1, *p2;
+ enum type_code code1;
+ enum type_code code2;
+
+ COERCE_ARRAY (arg1);
+ COERCE_ARRAY (arg2);
+
+ code1 = TYPE_CODE (VALUE_TYPE (arg1));
+ code2 = TYPE_CODE (VALUE_TYPE (arg2));
+
+ if (code1 == TYPE_CODE_INT && code2 == TYPE_CODE_INT)
+ return value_as_long (arg1) == value_as_long (arg2);
+ else if ((code1 == TYPE_CODE_FLT || code1 == TYPE_CODE_INT)
+ && (code2 == TYPE_CODE_FLT || code2 == TYPE_CODE_INT))
+ return value_as_double (arg1) == value_as_double (arg2);
+ else if ((code1 == TYPE_CODE_PTR && code2 == TYPE_CODE_INT)
+ || (code2 == TYPE_CODE_PTR && code1 == TYPE_CODE_INT))
+ return (char *) value_as_long (arg1) == (char *) value_as_long (arg2);
+ else if (code1 == code2
+ && ((len = TYPE_LENGTH (VALUE_TYPE (arg1)))
+ == TYPE_LENGTH (VALUE_TYPE (arg2))))
+ {
+ p1 = VALUE_CONTENTS (arg1);
+ p2 = VALUE_CONTENTS (arg2);
+ while (--len >= 0)
+ {
+ if (*p1++ != *p2++)
+ break;
+ }
+ return len < 0;
+ }
+ else
+ {
+ error ("Invalid type combination in equality test.");
+ return 0; /* For lint -- never reached */
+ }
+}
+
+/* Simulate the C operator < by returning 1
+ iff ARG1's contents are less than ARG2's. */
+
+int
+value_less (arg1, arg2)
+ register value arg1, arg2;
+{
+ register enum type_code code1;
+ register enum type_code code2;
+
+ COERCE_ARRAY (arg1);
+ COERCE_ARRAY (arg2);
+
+ code1 = TYPE_CODE (VALUE_TYPE (arg1));
+ code2 = TYPE_CODE (VALUE_TYPE (arg2));
+
+ if (code1 == TYPE_CODE_INT && code2 == TYPE_CODE_INT)
+ {
+ if (TYPE_UNSIGNED (VALUE_TYPE (arg1))
+ || TYPE_UNSIGNED (VALUE_TYPE (arg2)))
+ return (unsigned)value_as_long (arg1) < (unsigned)value_as_long (arg2);
+ else
+ return value_as_long (arg1) < value_as_long (arg2);
+ }
+ else if ((code1 == TYPE_CODE_FLT || code1 == TYPE_CODE_INT)
+ && (code2 == TYPE_CODE_FLT || code2 == TYPE_CODE_INT))
+ return value_as_double (arg1) < value_as_double (arg2);
+ else if ((code1 == TYPE_CODE_PTR || code1 == TYPE_CODE_INT)
+ && (code2 == TYPE_CODE_PTR || code2 == TYPE_CODE_INT))
+ {
+ /* FIXME, this assumes that host and target char *'s are the same! */
+ return (char *) value_as_long (arg1) < (char *) value_as_long (arg2);
+ }
+ else
+ {
+ error ("Invalid type combination in ordering comparison.");
+ return 0;
+ }
+}
+
+/* The unary operators - and ~. Both free the argument ARG1. */
+
+value
+value_neg (arg1)
+ register value arg1;
+{
+ register struct type *type;
+
+ COERCE_ENUM (arg1);
+
+ type = VALUE_TYPE (arg1);
+
+ if (TYPE_CODE (type) == TYPE_CODE_FLT)
+ return value_from_double (type, - value_as_double (arg1));
+ else if (TYPE_CODE (type) == TYPE_CODE_INT)
+ return value_from_long (type, - value_as_long (arg1));
+ else {
+ error ("Argument to negate operation not a number.");
+ return 0; /* For lint -- never reached */
+ }
+}
+
+value
+value_lognot (arg1)
+ register value arg1;
+{
+ COERCE_ENUM (arg1);
+
+ if (TYPE_CODE (VALUE_TYPE (arg1)) != TYPE_CODE_INT)
+ error ("Argument to complement operation not an integer.");
+
+ return value_from_long (VALUE_TYPE (arg1), ~ value_as_long (arg1));
+}
+
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