r375278 - [analyzer] Fix hidden node traversal in exploded graph dumps.

[Artem Dergachev via cfe-commits]

Author: dergachev
Date: Fri Oct 18 13:15:29 2019
New Revision: 375278

URL: http://llvm.org/viewvc/llvm-project?rev=375278&view=rev
Log:
[analyzer] Fix hidden node traversal in exploded graph dumps.

The joined nodes now actually have the same state. That was intended
from the start but the original implementation turned out to be buggy.

Differential Revision: https://reviews.llvm.org/D69150

Modified:
    cfe/trunk/lib/StaticAnalyzer/Core/ExprEngine.cpp
    cfe/trunk/test/Analysis/dump_egraph.c

Modified: cfe/trunk/lib/StaticAnalyzer/Core/ExprEngine.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/StaticAnalyzer/Core/ExprEngine.cpp?rev=375278&r1=375277&r2=375278&view=diff
==============================================================================
--- cfe/trunk/lib/StaticAnalyzer/Core/ExprEngine.cpp (original)
+++ cfe/trunk/lib/StaticAnalyzer/Core/ExprEngine.cpp Fri Oct 18 13:15:29 2019
@@ -3030,22 +3030,16 @@ struct DOTGraphTraits<ExplodedGraph*> :
       llvm::function_ref<void(const ExplodedNode *)> PreCallback,
       llvm::function_ref<void(const ExplodedNode *)> PostCallback,
       llvm::function_ref<bool(const ExplodedNode *)> Stop) {
-    const ExplodedNode *FirstHiddenNode = N;
-    while (FirstHiddenNode->pred_size() == 1 &&
-           isNodeHidden(*FirstHiddenNode->pred_begin())) {
-      FirstHiddenNode = *FirstHiddenNode->pred_begin();
-    }
-    const ExplodedNode *OtherNode = FirstHiddenNode;
     while (true) {
-      PreCallback(OtherNode);
-      if (Stop(OtherNode))
+      PreCallback(N);
+      if (Stop(N))
         return true;
 
-      if (OtherNode == N)
+      if (N->succ_size() != 1 || !isNodeHidden(N->getFirstSucc()))
         break;
-      PostCallback(OtherNode);
+      PostCallback(N);
 
-      OtherNode = *OtherNode->succ_begin();
+      N = N->getFirstSucc();
     }
     return false;
   }

Modified: cfe/trunk/test/Analysis/dump_egraph.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Analysis/dump_egraph.c?rev=375278&r1=375277&r2=375278&view=diff
==============================================================================
--- cfe/trunk/test/Analysis/dump_egraph.c (original)
+++ cfe/trunk/test/Analysis/dump_egraph.c Fri Oct 18 13:15:29 2019
@@ -18,10 +18,30 @@ int foo() {
   return *x + *y;
 }
 
-// CHECK: \"program_points\": [\l    \{ \"kind\": \"Edge\", \"src_id\": 2, \"dst_id\": 1, \"terminator\": null, \"term_kind\": null, \"tag\": null, \"node_id\": 1, \"is_sink\": 0, \"has_report\": 0 \}\l  ],\l  \"program_state\": null
-
-// CHECK: \"program_points\": [\l    \{ \"kind\": \"BlockEntrance\", \"block_id\": 1
-
+// CHECK: \"program_points\": [\l
+// CHECK-SAME: \{ \"kind\": \"Edge\", \"src_id\": 2, \"dst_id\": 1,
+// CHECK-SAME:    \"terminator\": null, \"term_kind\": null, \"tag\": null,
+// CHECK-SAME:    \"node_id\": 1, \"is_sink\": 0, \"has_report\": 0
+// CHECK-SAME: \},
+// CHECK-SAME: \{ \"kind\": \"BlockEntrance\", \"block_id\": 1, \"tag\": null,
+// CHECK-SAME:    \"node_id\": 2, \"is_sink\": 0, \"has_report\": 0
+// CHECK-SAME: \},
+// CHECK-SAME: \{ \"kind\": \"Statement\", \"stmt_kind\": \"IntegerLiteral\",
+// CHECK-SAME:    \"stmt_id\": 597, \"pointer\": \"0x{{[0-9a-f]*}}\",
+// CHECK-SAME:    \"pretty\": \"0\", \"location\": \{
+// CHECK-SAME:        \"line\": 15, \"column\": 12, \"file\":
+// CHECK-SAME:    \}, \"stmt_point_kind\": \"PreStmtPurgeDeadSymbols\",
+// CHECK-SAME:    \"tag\": \"ExprEngine : Clean Node\", \"node_id\": 3,
+// CHECK-SAME:    \"is_sink\": 0, \"has_report\": 0
+// CHECK-SAME: \},
+// CHECK-SAME: \{ \"kind\": \"Statement\", \"stmt_kind\": \"IntegerLiteral\",
+// CHECK-SAME:    \"stmt_id\": 597, \"pointer\": \"0x{{[0-9a-f]*}}\",
+// CHECK-SAME:    \"pretty\": \"0\", \"location\": \{
+// CHECK-SAME:        \"line\": 15, \"column\": 12, \"file\":
+// CHECK-SAME:    \}, \"stmt_point_kind\": \"PostStmt\", \"tag\": null,
+// CHECK-SAME:    \"node_id\": 4, \"is_sink\": 0, \"has_report\": 0
+// CHECK-SAME: \}
+// CHECK-SAME: ]
 
 // CHECK: \"pretty\": \"*x\", \"location\": \{ \"line\": 18, \"column\": 10, \"file\": \"{{(.+)}}dump_egraph.c\" \}