Generate forked states for switch instructions deterministically

This patch generates the states based on the order of switch-cases.
Before, switch-constraints were randomly assigned to forked states.
As generated code might be different between LLVM versions,
we use the case values, order them, and iterate in that order
over the cases.

This way we can also support deterministic execution of older LLVM
versions.

1 files changed, 81 insertions, 31 deletions

diff --git a/lib/Core/Executor.cpp b/lib/Core/Executor.cpp
index 49cba67f..709eb3a5 100644
--- a/lib/Core/Executor.cpp
+++ b/lib/Core/Executor.cpp
@@ -1609,58 +1609,108 @@ void Executor::executeInstruction(ExecutionState &state, KInstruction *ki) {
 #endif
       transferToBasicBlock(si->getSuccessor(index), si->getParent(), state);
     } else {
-      std::map<BasicBlock*, ref<Expr> > targets;
-      ref<Expr> isDefault = ConstantExpr::alloc(1, Expr::Bool);
-#if LLVM_VERSION_CODE >= LLVM_VERSION(3, 1)      
-      for (SwitchInst::CaseIt i = si->case_begin(), e = si->case_end();
-           i != e; ++i) {
+      // Handle possible different branch targets
+
+      // We have the following assumptions:
+      // - each case value is mutual exclusive to all other values including the
+      //   default value
+      // - order of case branches is based on the order of the expressions of
+      //   the scase values, still default is handled last
+      std::vector<BasicBlock *> bbOrder;
+      std::map<BasicBlock *, ref<Expr> > branchTargets;
+
+      std::map<ref<Expr>, BasicBlock *> expressionOrder;
+
+      // Iterate through all non-default cases and order them by expressions
+#if LLVM_VERSION_CODE >= LLVM_VERSION(3, 1)
+      for (SwitchInst::CaseIt i = si->case_begin(), e = si->case_end(); i != e;
+           ++i) {
         ref<Expr> value = evalConstant(i.getCaseValue());
 #else
-      for (unsigned i=1, cases = si->getNumCases(); i<cases; ++i) {
+      for (unsigned i = 1, cases = si->getNumCases(); i < cases; ++i) {
         ref<Expr> value = evalConstant(si->getCaseValue(i));
 #endif
-        ref<Expr> match = EqExpr::create(cond, value);
-        isDefault = AndExpr::create(isDefault, Expr::createIsZero(match));
+
+#if LLVM_VERSION_CODE >= LLVM_VERSION(3, 1)
+        BasicBlock *caseSuccessor = i.getCaseSuccessor();
+#else
+        BasicBlock *caseSuccessor = si->getSuccessor(i);
+#endif
+        expressionOrder.insert(std::make_pair(value, caseSuccessor));
+      }
+
+      // Track default branch values
+      ref<Expr> defaultValue = ConstantExpr::alloc(1, Expr::Bool);
+
+      // iterate through all non-default cases but in order of the expressions
+      for (std::map<ref<Expr>, BasicBlock *>::iterator
+               it = expressionOrder.begin(),
+               itE = expressionOrder.end();
+           it != itE; ++it) {
+        ref<Expr> match = EqExpr::create(cond, it->first);
+
+        // Make sure that the default value does not contain this target's value
+        defaultValue = AndExpr::create(defaultValue, Expr::createIsZero(match));
+
+        // Check if control flow could take this case
         bool result;
         bool success = solver->mayBeTrue(state, match, result);
         assert(success && "FIXME: Unhandled solver failure");
         (void) success;
         if (result) {
-#if LLVM_VERSION_CODE >= LLVM_VERSION(3, 1)
-          BasicBlock *caseSuccessor = i.getCaseSuccessor();
-#else
-          BasicBlock *caseSuccessor = si->getSuccessor(i);
-#endif
-          std::map<BasicBlock*, ref<Expr> >::iterator it =
-            targets.insert(std::make_pair(caseSuccessor,
-                           ConstantExpr::alloc(0, Expr::Bool))).first;
-
-          it->second = OrExpr::create(match, it->second);
+          BasicBlock *caseSuccessor = it->second;
+
+          // Handle the case that a basic block might be the target of multiple
+          // switch cases.
+          // Currently we generate an expression containing all switch-case
+          // values for the same target basic block. We spare us forking too
+          // many times but we generate more complex condition expressions
+          // TODO Add option to allow to choose between those behaviors
+          std::pair<std::map<BasicBlock *, ref<Expr> >::iterator, bool> res =
+              branchTargets.insert(std::make_pair(
+                  caseSuccessor, ConstantExpr::alloc(0, Expr::Bool)));
+
+          res.first->second = OrExpr::create(match, res.first->second);
+
+          // Only add basic blocks which have not been target of a branch yet
+          if (res.second) {
+            bbOrder.push_back(caseSuccessor);
+          }
         }
       }
+
+      // Check if control could take the default case
       bool res;
-      bool success = solver->mayBeTrue(state, isDefault, res);
+      bool success = solver->mayBeTrue(state, defaultValue, res);
       assert(success && "FIXME: Unhandled solver failure");
       (void) success;
-      if (res)
-        targets.insert(std::make_pair(si->getDefaultDest(), isDefault));
-      
+      if (res) {
+        std::pair<std::map<BasicBlock *, ref<Expr> >::iterator, bool> ret =
+            branchTargets.insert(
+                std::make_pair(si->getDefaultDest(), defaultValue));
+        if (ret.second) {
+          bbOrder.push_back(si->getDefaultDest());
+        }
+      }
+
+      // Fork the current state with each state having one of the possible
+      // successors of this switch
       std::vector< ref<Expr> > conditions;
-      for (std::map<BasicBlock*, ref<Expr> >::iterator it = 
-             targets.begin(), ie = targets.end();
-           it != ie; ++it)
-        conditions.push_back(it->second);
-      
+      for (std::vector<BasicBlock *>::iterator it = bbOrder.begin(),
+                                               ie = bbOrder.end();
+           it != ie; ++it) {
+        conditions.push_back(branchTargets[*it]);
+      }
       std::vector<ExecutionState*> branches;
       branch(state, conditions, branches);
-        
+
       std::vector<ExecutionState*>::iterator bit = branches.begin();
-      for (std::map<BasicBlock*, ref<Expr> >::iterator it = 
-             targets.begin(), ie = targets.end();
+      for (std::vector<BasicBlock *>::iterator it = bbOrder.begin(),
+                                               ie = bbOrder.end();
            it != ie; ++it) {
         ExecutionState *es = *bit;
         if (es)
-          transferToBasicBlock(it->first, bb, *es);
+          transferToBasicBlock(*it, bb, *es);
         ++bit;
       }
     }