- Added check for non-used variables.

This commit is contained in:
ccremers 2005-12-27 13:44:12 +00:00
parent 397298290b
commit ca4c5674ac
5 changed files with 198 additions and 54 deletions

View File

@ -3491,6 +3491,10 @@ arachne ()
if (switches.filterClaim == NULL
|| switches.filterClaim == cl->type)
{
// Some claims are always true!
if (!cl->alwaystrue)
{
// others we simply test...
int run;
Protocol p;
Role r;
@ -3553,6 +3557,7 @@ arachne ()
}
}
}
}
// next
cl = cl->next;
}

View File

@ -93,6 +93,28 @@ compilerDone (void)
return;
}
//! Compute read variables for a role
Termlist
compute_read_variables (const Role r)
{
Termlist tl;
int process_event (Roledef rd)
{
if (rd->type == READ)
{
tl = termlistAddVariables (tl, rd->from);
tl = termlistAddVariables (tl, rd->to);
tl = termlistAddVariables (tl, rd->message);
}
return 1;
}
tl = NULL;
roledef_iterate_events (r->roledef, process_event);
return tl;
}
/* ------------------------------------------------------------------- */
//! Compile the tac into the system
@ -189,6 +211,7 @@ levelDeclare (Symbol s, int isVar, int level)
return t;
}
//! Generate a term from a symbol
Term
symbolDeclare (Symbol s, int isVar)
{
@ -271,7 +294,7 @@ defineUsertype (Tac tcdu)
{
/* phew. warn anyway */
globalError++;
eprintf ("WARNING: double declaration of usertype ");
eprintf ("warning: double declaration of usertype ");
termPrint (tfind);
eprintf ("\n");
globalError--;
@ -288,6 +311,7 @@ defineUsertype (Tac tcdu)
}
}
//! Declare a variable at the current level
void
levelTacDeclaration (Tac tc, int isVar)
{
@ -295,12 +319,14 @@ levelTacDeclaration (Tac tc, int isVar)
Termlist typetl = NULL;
Term t;
// tscan contains the type list (as is const x,z: Term or var y: Term,Ding)
tscan = tc->t2.tac;
if (!isVar && tscan->next != NULL)
{
error ("Multiple type definition for constant on line %i.",
tscan->lineno);
}
// scan the whole type info list
while (tscan != NULL && tscan->op == TAC_STRING)
{
/* apparently there is type info, termlist? */
@ -322,12 +348,18 @@ levelTacDeclaration (Tac tc, int isVar)
typetl = termlistAdd (typetl, t);
tscan = tscan->next;
}
/* parse all constants and vars */
/* parse all constants and vars, because a single declaration can contain multiple ones */
tscan = tc->t1.tac;
while (tscan != NULL)
{
/* declare this variable/constant with the previously derived type list */
t = symbolDeclare (tscan->t1.sym, isVar);
t->stype = typetl;
if (isVar && level == 2)
{
/* it is a role variable, so add it to the nicely declared variables */
thisRole->declaredvars = termlistAdd (thisRole->declaredvars, t);
}
tscan = tscan->next;
}
}
@ -516,6 +548,8 @@ commEvent (int event, Tac tc)
cl->failed = 0;
cl->prec = NULL;
cl->roles = NULL;
cl->alwaystrue = false;
cl->warnings = false;
cl->next = sys->claimlist;
sys->claimlist = cl;
@ -535,6 +569,25 @@ commEvent (int event, Tac tc)
("Secrecy claim on line %i should not contain tuples (for Arachne) until it is officially supported.",
trip->next->lineno);
}
/* now check whether the claim contains variables that can actually be influenced by the intruder */
{
Termlist claimvars;
Termlist readvars;
claimvars = termlistAddVariables (NULL, msg);
readvars = compute_read_variables (thisRole);
while (claimvars != NULL)
{
if (!inTermlist (readvars, claimvars->term))
{
/* this claimvar does not occur in the reads? */
/* then we should ignore it later */
cl->alwaystrue = true;
cl->warnings = true;
}
claimvars = claimvars->next;
}
}
break;
}
if (claim == CLAIM_Nisynch)
@ -1423,9 +1476,10 @@ compute_prec_sets (const System sys)
if (cl->prec == NULL)
{
globalError++;
eprintf ("Warning: claim with empty prec() set at r:%i, ev:%i\n",
eprintf ("warning: claim with empty prec() set at r:%i, ev:%i\n",
r1, ev1);
globalError--;
cl->warnings = true;
}
else
{
@ -1467,6 +1521,74 @@ compute_prec_sets (const System sys)
}
//! Check unused variables
void
checkRoleVariables (const System sys, const Protocol p, const Role r)
{
Termlist vars;
Termlist declared;
int process_event (Roledef rd)
{
if (rd->type == READ)
{
vars = termlistAddVariables (vars, rd->from);
vars = termlistAddVariables (vars, rd->to);
vars = termlistAddVariables (vars, rd->message);
}
return 1;
}
/* Gather all variables occurring in the reads */
vars = NULL;
roledef_iterate_events (r->roledef, process_event);
/* Now, all variables for this role should be in the reads */
declared = r->declaredvars;
while (declared != NULL)
{
if (!inTermlist (vars, declared->term))
{
// Warning
globalError++;
eprintf ("warning: variable ");
termPrint (declared->term);
eprintf (" was declared in role ");
termPrint (p->nameterm);
eprintf (",");
termPrint (r->nameterm);
eprintf (" but never used in a read event.\n");
globalError--;
}
declared = declared->next;
}
termlistDelete (vars);
}
//! Check unused variables
/**
* This is checked per role
*/
void
checkUnusedVariables (const System sys)
{
Protocol p;
p = sys->protocols;
while (p != NULL)
{
Role r;
r = p->roles;
while (r != NULL)
{
checkRoleVariables (sys, p, r);
r = r->next;
}
p = p->next;
}
}
//! Preprocess after system compilation
void
preprocess (const System sys)
@ -1480,4 +1602,8 @@ preprocess (const System sys)
* compute preceding label sets
*/
compute_prec_sets (sys);
/*
* check for ununsed variables
*/
checkUnusedVariables (sys);
}

View File

@ -441,6 +441,12 @@ timersPrint (const System sys)
}
}
/* any warnings */
if (cl_scan->warnings)
{
eprintf ("\t(read the warnings for more information)");
}
/* proceed to next claim */
eprintf ("\n");
}

View File

@ -240,6 +240,7 @@ roleCreate (Term name)
r->roledef = NULL;
r->locals = NULL;
r->variables = NULL;
r->declaredvars = NULL;
r->initiator = 1; //! Will be determined later, if a read is the first action (in compiler.c)
r->next = NULL;
return r;

View File

@ -35,6 +35,10 @@ struct claimlist
int complete;
//! If we ran into the time bound (incomplete, and bad for results)
int timebound;
//! Some claims are always true (shown by the initial scan)
int alwaystrue;
//! Warnings should tell you more
int warnings;
int r; //!< role number for mapping
int ev; //!< event index in role
@ -120,6 +124,8 @@ struct role
Termlist locals;
//! Local variables for this role.
Termlist variables;
//! Declared variables for this role
Termlist declaredvars;
//! Flag for initiator roles
int initiator;
//! Pointer to next role definition.