Merge pull request gcc-mirror#55 from NinaRanns/noexcept_observe

noexcept_observe

gcc/c-family/c.opt

@@ -1929,9 +1929,12 @@ Enum(p2900_semantic) String(quick_enforce) Value(5)
 EnumValue
 Enum(p2900_semantic) String(noexcept_enforce) Value(6)
 
+EnumValue
+Enum(p2900_semantic) String(noexcept_observe) Value(7)
+
 fcontract-evaluation-semantic=
 C++ Joined RejectNegative Enum(p2900_semantic) Var(flag_contract_evaluation_semantic) Init (3)
--fcontract-evaluation-semantic=[ignore|observe|enforce|quick_enforce|noexcept_enforce]	Select the contract evaluation semantic (defaults to enforce).
+-fcontract-evaluation-semantic=[ignore|observe|enforce|quick_enforce|noexcept_enforce|noexcept_observe]	Select the contract evaluation semantic (defaults to enforce).
 
 fcontract-checks-outlined
 C++ Var(flag_contract_checks_outlined) Init(1)

gcc/cp/contracts.cc

@@ -2171,6 +2171,8 @@ get_evaluation_semantic(tree contract)
 	return CES_QUICK;
       case CCS_NOEXCEPT_ENFORCE:
 	return CES_NOEXCEPT_ENFORCE;
+      case CCS_NOEXCEPT_OBSERVE:
+	return CES_NOEXCEPT_OBSERVE;
     }
 }
 
@@ -2375,12 +2377,14 @@ build_contract_check (tree contract)
       finish_if_stmt_cond (cond, if_stmt);
       /* Using the P2900 names here c++2a ENFORCE=NEVER, OBSERVE=MAYBE.  */
       if (semantic == CCS_ENFORCE || semantic == CCS_OBSERVE
-	  || semantic == CCS_NOEXCEPT_ENFORCE)
+	  || semantic == CCS_NOEXCEPT_ENFORCE
+	  || semantic == CCS_NOEXCEPT_OBSERVE)
 	{
 	  tree violation = build_contract_violation (contract,
 						     /*is_const*/true);
-	  build_contract_handler_call (violation,
-				       semantic == CCS_NOEXCEPT_ENFORCE);
+	  bool noexcept_wrap = (semantic == CCS_NOEXCEPT_ENFORCE)
+	       || (semantic == CCS_NOEXCEPT_OBSERVE);
+	  build_contract_handler_call (violation, noexcept_wrap);
 	}
 
       if (semantic == CCS_QUICK)
@@ -2417,7 +2421,8 @@ build_contract_check (tree contract)
      violation object or handler.  */
   tree excp_ = NULL_TREE;
   if (semantic == CCS_ENFORCE || semantic == CCS_OBSERVE
-      || semantic ==CCS_NOEXCEPT_ENFORCE)
+      || semantic ==CCS_NOEXCEPT_ENFORCE
+      || semantic == CCS_NOEXCEPT_OBSERVE)
     {
       excp_ = build_decl (loc, VAR_DECL, NULL, boolean_type_node);
       /* compiler-generated.  */
@@ -2433,7 +2438,8 @@ build_contract_check (tree contract)
 
   tree violation = NULL_TREE;
   if (semantic == CCS_ENFORCE || semantic == CCS_OBSERVE
-      || semantic == CCS_NOEXCEPT_ENFORCE)
+      || semantic == CCS_NOEXCEPT_ENFORCE
+      || semantic == CCS_NOEXCEPT_OBSERVE)
     violation = build_contract_violation (contract, /*is_const*/false);
 
   /* Wrap the contract check in a try-catch.  */
@@ -2446,7 +2452,8 @@ build_contract_check (tree contract)
   tree handler = begin_handler ();
   finish_handler_parms (NULL_TREE, handler); /* catch (...) */
   if (semantic == CCS_ENFORCE || semantic == CCS_OBSERVE
-      || semantic == CCS_NOEXCEPT_ENFORCE)
+      || semantic == CCS_NOEXCEPT_ENFORCE
+      || semantic == CCS_NOEXCEPT_OBSERVE)
     {
       /* Update the violation object type.  */
       tree v_type = get_pseudo_contract_violation_type ();
@@ -2457,7 +2464,9 @@ build_contract_check (tree contract)
       r = cp_build_init_expr (r, build_int_cst (integer_type_node,
 					    CDM_EVAL_EXCEPTION));
       finish_expr_stmt (r);
-      build_contract_handler_call (violation, semantic == CCS_NOEXCEPT_ENFORCE);
+      bool noexcept_wrap = (semantic == CCS_NOEXCEPT_ENFORCE)
+	  || (semantic == CCS_NOEXCEPT_OBSERVE);
+      build_contract_handler_call (violation, noexcept_wrap);
       /* Note we had an exception.  */
       finish_expr_stmt (cp_build_init_expr (excp_, boolean_true_node));
     }
@@ -2476,7 +2485,8 @@ build_contract_check (tree contract)
   finish_if_stmt_cond (cond, if_not_cond);
 
   if (semantic == CCS_ENFORCE || semantic == CCS_OBSERVE
-      || semantic == CCS_NOEXCEPT_ENFORCE)
+      || semantic == CCS_NOEXCEPT_ENFORCE
+      || semantic == CCS_NOEXCEPT_OBSERVE)
     {
       tree if_not_excp = begin_if_stmt ();
       cond = build_x_unary_op (loc, TRUTH_NOT_EXPR, excp_, NULL_TREE,

gcc/cp/contracts.h

@@ -38,6 +38,7 @@ enum contract_level
    CCS_NEVER  -> enforce
    CCS_QUICK  -> quick_enforce
    CCS_NOEXCEPT_ENFORCE -> noexcept_enforce
+   CCS_NOEXCEPT_OBSERVE -> noexcept_observe
 */
 
 enum contract_semantic
@@ -50,7 +51,8 @@ enum contract_semantic
   CCS_MAYBE = 4,
   CCS_OBSERVE = CCS_MAYBE,
   CCS_QUICK = 5,
-  CCS_NOEXCEPT_ENFORCE
+  CCS_NOEXCEPT_ENFORCE,
+  CCS_NOEXCEPT_OBSERVE
 };
 
 /* True if the contract is unchecked.  */
@@ -102,7 +104,8 @@ enum contract_evaluation_semantic {
   CES_OBSERVE = 2,
   CES_ENFORCE = 3,
   CES_QUICK = 4,
-  CES_NOEXCEPT_ENFORCE =5
+  CES_NOEXCEPT_ENFORCE = 5,
+  CES_NOEXCEPT_OBSERVE = 6
 };
 
 enum constract_detection_mode {

gcc/testsuite/g++.dg/contracts/cpp26/noexcept-observe.C

@@ -0,0 +1,12 @@
+// Test that there is no crash with default contract violation handler and noexcept_observe
+// { dg-do compile }
+// { dg-options "-std=c++2a -fcontracts -fcontracts-nonattr -fcontract-evaluation-semantic=noexcept_observe " }
+
+
+void f(int i) pre(i > 0){}
+
+int main()
+{
+  f(0);
+}
+

gcc/testsuite/g++.dg/contracts/cpp26/noexcept-observe2.C

@@ -0,0 +1,36 @@
+//Test that a throwing violation handler causes termination with noexcept-observe
+// { dg-do run }
+// { dg-options "-std=c++2a -fcontracts -fcontracts-nonattr -fcontract-evaluation-semantic=noexcept_observe " }
+#include <experimental/contract>
+#include <exception>
+#include <cstdlib>
+
+void my_term()
+{
+  try { throw; }
+  catch(int) { std::exit(0); }
+}
+void handle_contract_violation(const std::experimental::contract_violation& violation)
+{
+  throw 1;
+}
+
+struct X
+{
+  void f(const int x) pre(x>1) post(x>3) {
+     int i = 1;
+  }
+};
+
+int main()
+{
+  std::set_terminate (my_term);
+  try
+  {
+      X x;
+      x.f(-42);
+  } catch (...) {
+  }
+  // We should not get here
+  return 1;
+}

gcc/testsuite/g++.dg/contracts/cpp26/noexcept-observe3.C

@@ -0,0 +1,32 @@
+//Test that a throwing violation handler causes termination with noexcept-observe
+// { dg-do run }
+// { dg-options "-std=c++2a -fcontracts -fcontracts-nonattr -fcontract-evaluation-semantic=noexcept_observe " }
+#include <experimental/contract>
+#include <exception>
+#include <cstdlib>
+
+void my_term()
+{
+  try { throw; }
+  catch(int) { std::exit(0); }
+}
+
+void handle_contract_violation(const std::experimental::contract_violation& violation)
+{
+  throw 1;
+}
+
+void f(int x) pre(x >= 0)
+{
+}
+
+int main()
+{
+  std::set_terminate (my_term);
+  try
+  {
+      f(-42);
+  } catch (...) {}
+  // We should not get here
+  return 1;
+}

gcc/testsuite/g++.dg/contracts/cpp26/noexcept-observe4.C

@@ -0,0 +1,15 @@
+//Test that noexcept-observe with a non throwing violation handler has
+// observe semantics
+// { dg-do run }
+// { dg-options "-std=c++2a -fcontracts -fcontracts-nonattr -fcontract-evaluation-semantic=noexcept_observe " }
+
+int f(const int a, const int b) pre (a > 2) post(r : r > 2){ return 1;};
+
+int main(int, char**)
+{
+  f(1,1);
+  return 0;
+}
+
+// { dg-output "contract violation in function f at .*: a > 2.*(\n|\r\n|\r)" }
+// { dg-output "contract violation in function f at .*: r > 2.*(\n|\r\n|\r)" }