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mailing list for the GDB project.
Re: Scope Checking Patch
Here is the new fixed patch. The following operators are covered:
A large number of operators in the evaluate_subexp_standard function
are not changed as I am unsure what they are used for or not sure
about the correct way to change them.
In a sense it depends on whether it should be possible to check the
scope of complex expressions. I think it probably should, as it is
consistent, but it would require extra work to implement and may not
be worth it as people may never use it.
However, currently it should be possible to check if variables,
constants, structures and memebers of structures/classes are in scope.
For binary operators, I consider that an expresion is on scope of all
of it's sub expressions are in scope, that is a binary AND. This is
implemented (trivially) for the case for AND, and also for the case
for OR. I wanted to check that we way I had done ti was teh best way
to do it, before I added a case to every other binary operator.
For unary operators, the value should just be the value of the
subexpression (currently this is unimplemented, but will be when I can
face the monotony of a lot of cutting and pasting).
Any thoughts you have on the patch, other cases which should be
covered, better ways of doing it, test cases, and anything like that
is much appreciated.
Thanks,
Rob
P.S. There still seems to be a lot of extra info in the diff, despite
now having build directories sorted properly.
diff -urN ./clean/src/gdb/c-exp.y modified/src/gdb/c-exp.y
--- ./clean/src/gdb/c-exp.y 2007-06-05 23:47:50.000000000 +0100
+++ modified/src/gdb/c-exp.y 2007-06-10 18:25:16.000000000 +0100
@@ -101,6 +101,9 @@
#define yytable c_yytable
#define yycheck c_yycheck
+/* Global variable denoting whether we are only interested in scope, not value */
+int check_scope = 0;
+
#ifndef YYDEBUG
#define YYDEBUG 1 /* Default to yydebug support */
#endif
@@ -201,6 +204,8 @@
%token TRUEKEYWORD
%token FALSEKEYWORD
+/* $in_scope opperator */
+%left IN_SCOPE
%left ','
%left ABOVE_COMMA
@@ -244,6 +249,11 @@
;
/* Expressions, not including the comma operator. */
+exp : IN_SCOPE
+ { check_scope = 1; }
+ '(' exp ')'
+ ;
+
exp : '*' exp %prec UNARY
{ write_exp_elt_opcode (UNOP_IND); }
;
@@ -583,8 +593,25 @@
VAR_DOMAIN, (int *) NULL,
(struct symtab **) NULL);
if (sym == 0)
- error ("No symbol \"%s\" in specified context.",
+ {
+ /* Case for scope checking. If scope is being checked and
+ the symbol is not in scope, return an expresison of
+ value 0. */
+ if(check_scope == 0)
+ {
+ error ("No symbol \"%s\" in specified context.",
copy_name ($3));
+ }
+ else
+ {
+ YYSTYPE val;
+ parse_number ("0", 1, 0, &val);
+ write_exp_elt_opcode (OP_LONG);
+ write_exp_elt_type (val.typed_val_int.type);
+ write_exp_elt_longcst ((LONGEST)val.typed_val_int.val);
+ write_exp_elt_opcode (OP_LONG);
+ }
+ }
write_exp_elt_opcode (OP_VAR_VALUE);
/* block_found is set by lookup_symbol. */
@@ -663,8 +690,22 @@
if (!have_full_symbols () && !have_partial_symbols ())
error ("No symbol table is loaded. Use the \"file\" command.");
else
- error ("No symbol \"%s\" in current context.", name);
- }
+ {
+ if(check_scope == 0)
+ {
+ error ("No symbol \"%s\" in current context.", name);
+ }
+ else
+ {
+ YYSTYPE val;
+ parse_number ("0", 1, 0, &val);
+ write_exp_elt_opcode (OP_LONG);
+ write_exp_elt_type (val.typed_val_int.type);
+ write_exp_elt_longcst ((LONGEST)val.typed_val_int.val);
+ write_exp_elt_opcode (OP_LONG);
+ }
+ }
+}
;
variable: name_not_typename
@@ -718,8 +759,19 @@
else if (!have_full_symbols () && !have_partial_symbols ())
error ("No symbol table is loaded. Use the \"file\" command.");
else
- error ("No symbol \"%s\" in current context.",
- copy_name ($1.stoken));
+ {
+ if(check_scope == 0)
+ error ("No symbol \"%s\" in current context.", copy_name ($1.stoken));
+ else
+ {
+ YYSTYPE val;
+ parse_number ("0", 1, 0, &val);
+ write_exp_elt_opcode (OP_LONG);
+ write_exp_elt_type (val.typed_val_int.type);
+ write_exp_elt_longcst ((LONGEST)val.typed_val_int.val);
+ write_exp_elt_opcode (OP_LONG);
+ }
+ }
}
}
;
@@ -1258,6 +1310,11 @@
enum exp_opcode opcode;
};
+static const struct token tokentab9[] =
+ {
+ {"$in_scope", IN_SCOPE, BINOP_END}
+ };
+
static const struct token tokentab3[] =
{
{">>=", ASSIGN_MODIFY, BINOP_RSH},
@@ -1320,6 +1377,15 @@
prev_lexptr = lexptr;
tokstart = lexptr;
+ /* Code for recognising the $in_scope token. */
+ /* See if it is a special token of length 9. */
+ for (i = 0; i < sizeof tokentab9 / sizeof tokentab9[0]; i++)
+ if (strncmp (tokstart, tokentab9[i].operator, 9) == 0)
+ {
+ lexptr += 9;
+ yylval.opcode = tokentab9[i].opcode;
+ return tokentab9[i].token;
+ }
/* See if it is a special token of length 3. */
for (i = 0; i < sizeof tokentab3 / sizeof tokentab3[0]; i++)
if (strncmp (tokstart, tokentab3[i].operator, 3) == 0)
diff -urN ./clean/src/gdb/eval.c modified/src/gdb/eval.c
--- ./clean/src/gdb/eval.c 2007-06-05 23:47:50.000000000 +0100
+++ modified/src/gdb/eval.c 2007-06-13 14:11:04.000000000 +0100
@@ -46,6 +46,9 @@
/* This is defined in valops.c */
extern int overload_resolution;
+/* Variable denoting is scope is being checked */
+extern int check_scope;
+
/* JYG: lookup rtti type of STRUCTOP_PTR when this is set to continue
on with successful lookup for member/method of the rtti type. */
extern int objectprint;
@@ -164,7 +167,16 @@
evaluate_expression (struct expression *exp)
{
int pc = 0;
- return evaluate_subexp (NULL_TYPE, exp, &pc, EVAL_NORMAL);
+
+ /* Modifications so that if we are checking scope we can
+ reset the value of the variable to 0, so we don't check
+ scope when we don't want to */
+ struct value *val = evaluate_subexp (NULL_TYPE, exp, &pc, EVAL_NORMAL);
+
+ if(check_scope == 1)
+ check_scope = 0;
+
+ return val;
}
/* Evaluate an expression, avoiding all memory references
@@ -445,18 +457,36 @@
&exp->elts[pc + 3].string,
0, noside);
if (arg1 == NULL)
- error (_("There is no field named %s"), &exp->elts[pc + 3].string);
+ {
+ if (check_scope == 1)
+ return value_from_longest (builtin_type_int, (LONGEST) 1);
+ else
+ 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,
+
+ /* This is a special case, as if we are checking a variable is in scope
+ * and it isn't then the type of the expression returned is of type long
+ * and we end up here.
+ */
+ if (check_scope == 1 && exp->elts[pc+2].longconst != 0)
+ return value_from_longest (builtin_type_int, (LONGEST) 1);
+ else
+ 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,
+
+ if (check_scope == 0)
+ return value_from_double (exp->elts[pc + 1].type,
exp->elts[pc + 2].doubleconst);
+ else
+ return value_from_longest (builtin_type_int, (LONGEST) 1);
case OP_VAR_VALUE:
(*pos) += 3;
@@ -472,6 +502,14 @@
value_rtti_target_type () if we are dealing with a pointer
or reference to a base class and print object is on. */
+ /* Special case, if we are checking scope and a variable is
+ in scope, return a expression of value 1. */
+ if (check_scope == 0)
+ return value_of_variable (exp->elts[pc + 2].symbol,
+ exp->elts[pc + 1].block);
+ else
+ return value_from_longest (builtin_type_int, (LONGEST) 1);
+
{
volatile struct gdb_exception except;
struct value *ret = NULL;
@@ -495,8 +533,11 @@
case OP_LAST:
(*pos) += 2;
- return
- access_value_history (longest_to_int (exp->elts[pc + 1].longconst));
+ if (check_scope == 0)
+ return
+ access_value_history (longest_to_int (exp->elts[pc + 1].longconst));
+ else
+ return value_from_longest (builtin_type_int, (LONGEST) 1);
case OP_REGISTER:
{
@@ -511,24 +552,38 @@
error (_("Value of register %s not available."),
frame_map_regnum_to_name (get_selected_frame (NULL), regno));
else
+ if(check_scope == 0)
return val;
+ else
+ return value_from_longest (builtin_type_int, (LONGEST) 1);
}
+
case OP_BOOL:
(*pos) += 2;
- return value_from_longest (LA_BOOL_TYPE,
- exp->elts[pc + 1].longconst);
+ if (check_scope == 0)
+ return value_from_longest (LA_BOOL_TYPE,
+ exp->elts[pc + 1].longconst);
+ else
+ return value_from_longest (builtin_type_int, (LONGEST) 1);
+
case OP_INTERNALVAR:
(*pos) += 2;
- return value_of_internalvar (exp->elts[pc + 1].internalvar);
+ 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);
+ if (check_scope == 0)
+ return value_string (&exp->elts[pc + 2].string, tem);
+ else
+ return value_from_longest (builtin_type_int, (LONGEST) 1);
+
+
case OP_OBJC_NSSTRING: /* Objective C Foundation Class NSString constant. */
tem = longest_to_int (exp->elts[pc + 1].longconst);
(*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
@@ -1333,7 +1388,19 @@
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);
+
+ /* Temporalily disable scope checking while we evaluate
+ the subexpression, so that the correct type of value
+ is returned */
+ if(check_scope == 1)
+ {
+ check_scope = 0;
+ arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
+ check_scope = 1;
+ }
+ else
+ arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside);
+
if (noside == EVAL_SKIP)
goto nosideret;
if (noside == EVAL_AVOID_SIDE_EFFECTS)
@@ -1434,8 +1501,12 @@
case BINOP_CONCAT:
arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
+
+ if (check_scope == 1)
+ return value_binop (arg1, arg2, BINOP_LOGICAL_AND);
+
if (noside == EVAL_SKIP)
- goto nosideret;
+ goto nosideret;
if (binop_user_defined_p (op, arg1, arg2))
return value_x_binop (arg1, arg2, op, OP_NULL, noside);
else
@@ -1446,32 +1517,36 @@
arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
- return arg1;
+ return arg1;
if (binop_user_defined_p (op, arg1, arg2))
- return value_x_binop (arg1, arg2, op, OP_NULL, noside);
+ 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;
+ 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);
+ return value_x_binop (arg1, arg2, BINOP_ASSIGN_MODIFY, op, noside);
else if (op == BINOP_ADD)
- arg2 = value_add (arg1, arg2);
+ arg2 = value_add (arg1, arg2);
else if (op == BINOP_SUB)
- arg2 = value_sub (arg1, arg2);
+ arg2 = value_sub (arg1, arg2);
else
- arg2 = value_binop (arg1, arg2, op);
+ 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))
@@ -1482,6 +1557,7 @@
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))
@@ -1501,6 +1577,7 @@
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))
@@ -1514,6 +1591,7 @@
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"));
@@ -1521,6 +1599,7 @@
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))
@@ -1552,6 +1631,7 @@
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);
@@ -1737,10 +1817,25 @@
else
{
tem = value_logical_not (arg1);
- arg2 = evaluate_subexp (NULL_TYPE, exp, pos,
+
+ /* A special case. If we are checking scope, the result should be
+ * the logical AND, of the sub-expressions, not OR
+ */
+ if (check_scope == 0)
+ {
+ arg2 = evaluate_subexp (NULL_TYPE, exp, pos,
(!tem ? EVAL_SKIP : noside));
- return value_from_longest (LA_BOOL_TYPE,
- (LONGEST) (!tem || !value_logical_not (arg2)));
+
+ return value_from_longest (LA_BOOL_TYPE,
+ (LONGEST) (!tem || !value_logical_not (arg2)));
+ }
+ else
+ {
+ 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:
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diff -urN ./clean/src/gdb/testsuite/gdb.base/shreloc.txt modified/src/gdb/testsuite/gdb.base/shreloc.txt
--- ./clean/src/gdb/testsuite/gdb.base/shreloc.txt 2007-06-10 21:46:45.000000000 +0100
+++ modified/src/gdb/testsuite/gdb.base/shreloc.txt 2007-06-10 22:17:06.000000000 +0100
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+Object file /home/rob/GDB/src/gdb/testsuite/gdb.base/shreloc:
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