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frama-c-stady's Issues

Invalid memory reference when using unary minus operator

I try to find a counter example for the assertion at the end of function relational_wrapper_1:
Rpp: return_variable_relational_1 == - return_variable_relational_2;
I get message reporting Invalid memory reference.

However, if I try to find counter example for a rewritten version, everything goes well:
Rpp: return_variable_relational_1 == 0 - return_variable_relational_2;

struct CollectionItem {
   int cardSet ;
   int cardRarity ;
   int cardId ;
   int cardType ;
};

void relational_wrapper_1(struct CollectionItem x1, struct CollectionItem x2)
{
  int return_variable_relational_1;
  int return_variable_relational_2;
  {
    int __retres_1;
    if (x1.cardSet < x2.cardSet) {
      __retres_1 = -1;
      goto return_label_label_1;
    }
    else {
      if (x1.cardSet == x2.cardSet) 
        if (x1.cardRarity < x2.cardRarity) {
          __retres_1 = 1;
          goto return_label_label_1;
        }
        else {
          if (x1.cardId == x2.cardId) 
            if (x1.cardType > x2.cardType) {
              __retres_1 = 1;
              goto return_label_label_1;
            }
            else {
              if (x1.cardType == x2.cardType) {
                __retres_1 = 0;
                goto return_label_label_1;
              }
              __retres_1 = -1;
              goto return_label_label_1;
            }
          __retres_1 = -1;
          goto return_label_label_1;
        }
      __retres_1 = 1;
      goto return_label_label_1;
    }
    return_label_label_1: return_variable_relational_1 = __retres_1;
  }
  {
    int __retres_2;
    if (x2.cardSet < x1.cardSet) {
      __retres_2 = -1;
      goto return_label_label_2;
    }
    else {
      if (x2.cardSet == x1.cardSet) 
        if (x2.cardRarity < x1.cardRarity) {
          __retres_2 = 1;
          goto return_label_label_2;
        }
        else {
          if (x2.cardId == x1.cardId) 
            if (x2.cardType > x1.cardType) {
              __retres_2 = 1;
              goto return_label_label_2;
            }
            else {
              if (x2.cardType == x1.cardType) {
                __retres_2 = 0;
                goto return_label_label_2;
              }
              __retres_2 = -1;
              goto return_label_label_2;
            }
          __retres_2 = -1;
          goto return_label_label_2;
        }
      __retres_2 = 1;
      goto return_label_label_2;
    }
    return_label_label_2: return_variable_relational_2 = __retres_2;
  }
  /*@ assert
      Rpp: return_variable_relational_1 == - return_variable_relational_2;
  */
  return;
}

Unexpected error (StaDy.Translate.Unreachable)

I have the following error for the example issue.c give as an attachment:

[kernel] Parsing issue.c (with preprocessing)
[kernel] Current source was: issue.c:28
    The full backtrace is:
    Raised at file "translate.ml", line 876, characters 19-30
    Called from file "translate.ml", line 900, characters 13-24
    Called from file "translate.ml", line 908, characters 20-60
    Called from file "translate.ml", line 920, characters 11-65
    Called from file "translate.ml", line 924, characters 21-34
    Called from file "translate.ml", line 985, characters 34-56
    Called from file "list.ml", line 77, characters 12-15
    Called from file "translate.ml", line 992, characters 4-57
    Called from file "src/kernel_services/ast_queries/cil.ml", line 2239, characters 15-31
    Called from file "src/kernel_services/ast_queries/cil.ml", line 3723, characters 5-91
    Called from file "src/kernel_services/ast_queries/cil.ml", line 3814, characters 16-38
    Called from file "src/kernel_services/ast_queries/cil.ml", line 2278, characters 13-16
    Called from file "src/kernel_services/ast_queries/cil.ml", line 2323, characters 24-57
    Called from file "src/kernel_services/ast_queries/cil.ml", line 3808, characters 5-53
    Called from file "src/kernel_services/ast_queries/cil.ml", line 6463, characters 17-37
    Called from file "src/kernel_services/ast_queries/cil.ml", line 6470, characters 3-20
    Called from file "src/kernel_services/ast_queries/cil.ml", line 2254, characters 21-41
    Called from file "src/kernel_services/ast_queries/cil.ml", line 6487, characters 15-39
    Called from file "src/kernel_services/visitors/visitor.ml", line 849, characters 28-60
    Called from file "register.ml", line 102, characters 4-60
    Called from file "register.ml", line 142, characters 6-21
    Called from file "src/libraries/project/state_builder.ml", line 994, characters 9-13
    Re-raised at file "src/libraries/project/state_builder.ml", line 1002, characters 15-18
    Called from file "queue.ml", line 105, characters 6-15
    Called from file "src/kernel_internals/runtime/boot.ml", line 37, characters 4-20
    Called from file "src/kernel_services/cmdline_parameters/cmdline.ml", line 789, characters 2-9
    Called from file "src/kernel_services/cmdline_parameters/cmdline.ml", line 819, characters 18-64
    Called from file "src/kernel_services/cmdline_parameters/cmdline.ml", line 228, characters 4-8
    
    Unexpected error (StaDy.Translate.Unreachable).
    Please report as 'crash' at http://bts.frama-c.com/.
    Your Frama-C version is Sulfur-20171101.
    Note that a version and a backtrace alone often do not contain enough
    information to understand the bug. Guidelines for reporting bugs are at:
    http://bts.frama-c.com/dokuwiki/doku.php?id=mantis:frama-c:bug_reporting_guidelines

issue.zip

Bad projection on input

I try to find counter examples for the assert clause in the relational_wrapper_1 function in
the test.c file in Example.zip.
The instrument file generated by Stady is also placed in the .zip

I get the following back trace:

[kernel] Parsing test.c (with preprocessing)
[kernel] Parsing __sd_instru_test_relational_wrapper_1.c (with preprocessing)
[kernel] Parsing __sd_instru_test_relational_wrapper_1.c (with preprocessing)
[pc] Starting lanceur_relational_wrapper_1 (isc version)
[pc] Starting lanceur_pathcrawler__relational_wrapper_1_precond (isc version)
[pc] Starting lanceur_relational_wrapper_1 (isc version)
[pc] TEST GENERATION WARNING!!!
[pc] Bad projection on input values of expression return_variable_relational_1__relational_wrapper_1 in the assignment at line number 282 of file __sd_instru_test_relational_wrapper_1.c.
[pc] Please check your test context and source code for uninitialised variables.
[pc] Starting lanceur_relational_wrapper_1 (isc version)
[pc] Unexpected exception occured: Sys.Break
Raised at file "sys.ml", line 102, characters 52-57
Called from file "unix.ml", line 862, characters 6-20
Called from file "unix.ml", line 862, characters 6-20
Called from file "unix.ml", line 874, characters 13-34
Called from file "pc_scripts.ml", line 701, characters 4-19
Called from file "pc_scripts.ml", line 758, characters 6-22
[stady] user error: internet socket now closed!
[kernel] Plug-in stady aborted: invalid user input.

Feature request

It would be interesting to have a support for variables with several offset in ensures clauses.
The following example make Stady crach :

struct s{
  int t[10];
};

/*@ ensures \result == a.t[0];*/
int f(struct s a){
  return  a.t[0];
}

void main(struct s a){
  int b;
  b = f(a);
 /*@ assert b == a.t[1];*/
}

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