C++: Fix IR printing when multiple edges point to the same block

Author: jketema

cpp/ql/lib/semmle/code/cpp/ir/implementation/aliased_ssa/PrintIR.qll

@@ -427,11 +427,18 @@ query predicate edges(PrintableIRBlock pred, PrintableIRBlock succ, string key,
     succBlock = succ.getBlock() and
     predBlock.getSuccessor(kind) = succBlock and
     (
-      (
-        key = "semmle.label" and
+      key = "semmle.label" and
+      exists(string kinds |
+        kinds =
+          concat(EdgeKind k |
+            predBlock.getSuccessor(k) = succBlock
+          |
+            k.toString(), "|" order by k.toString()
+          )
+      |
         if predBlock.getBackEdgeSuccessor(kind) = succBlock
-        then value = kind.toString() + " (back edge)"
-        else value = kind.toString()
+        then value = kinds + " (back edge)"
+        else value = kinds
       )
       or
       key = "semmle.order" and

cpp/ql/lib/semmle/code/cpp/ir/implementation/raw/PrintIR.qll

@@ -427,11 +427,18 @@ query predicate edges(PrintableIRBlock pred, PrintableIRBlock succ, string key,
     succBlock = succ.getBlock() and
     predBlock.getSuccessor(kind) = succBlock and
     (
-      (
-        key = "semmle.label" and
+      key = "semmle.label" and
+      exists(string kinds |
+        kinds =
+          concat(EdgeKind k |
+            predBlock.getSuccessor(k) = succBlock
+          |
+            k.toString(), "|" order by k.toString()
+          )
+      |
         if predBlock.getBackEdgeSuccessor(kind) = succBlock
-        then value = kind.toString() + " (back edge)"
-        else value = kind.toString()
+        then value = kinds + " (back edge)"
+        else value = kinds
       )
       or
       key = "semmle.order" and

cpp/ql/lib/semmle/code/cpp/ir/implementation/unaliased_ssa/PrintIR.qll

@@ -427,11 +427,18 @@ query predicate edges(PrintableIRBlock pred, PrintableIRBlock succ, string key,
     succBlock = succ.getBlock() and
     predBlock.getSuccessor(kind) = succBlock and
     (
-      (
-        key = "semmle.label" and
+      key = "semmle.label" and
+      exists(string kinds |
+        kinds =
+          concat(EdgeKind k |
+            predBlock.getSuccessor(k) = succBlock
+          |
+            k.toString(), "|" order by k.toString()
+          )
+      |
         if predBlock.getBackEdgeSuccessor(kind) = succBlock
-        then value = kind.toString() + " (back edge)"
-        else value = kind.toString()
+        then value = kinds + " (back edge)"
+        else value = kinds
       )
       or
       key = "semmle.order" and

cpp/ql/test/library-tests/ir/ir/aliased_ir.expected

@@ -38831,7 +38831,7 @@ try_except.c:
 #   23|     v23_3(void)           = Call[ProbeFunction]            : func:r23_1, 0:r23_2
 #   23|     m23_4(unknown)        = ^CallSideEffect                : ~m21_5
 #   23|     m23_5(unknown)        = Chi                            : total:m21_5, partial:m23_4
-#-----|   SEH Exception -> Block 4
+#-----|   Goto|SEH Exception -> Block 4
 
 #   26|   Block 4
 #   26|     m26_1(unknown)        = Phi                   : from 0:~m21_5, from 3:~m23_5
@@ -39028,7 +39028,7 @@ try_except.cpp:
 #   23|     v23_3(void)           = Call[ProbeFunction]            : func:r23_1, 0:r23_2
 #   23|     m23_4(unknown)        = ^CallSideEffect                : ~m21_5
 #   23|     m23_5(unknown)        = Chi                            : total:m21_5, partial:m23_4
-#-----|   SEH Exception -> Block 4
+#-----|   Goto|SEH Exception -> Block 4
 
 #   26|   Block 4
 #   26|     m26_1(unknown)        = Phi                   : from 0:~m21_5, from 3:~m23_5

cpp/ql/test/library-tests/ir/ir/raw_ir.expected

@@ -37077,7 +37077,7 @@ try_except.c:
 #   23|     r23_2(int)            = Constant[0]                    : 
 #   23|     v23_3(void)           = Call[ProbeFunction]            : func:r23_1, 0:r23_2
 #   23|     mu23_4(unknown)       = ^CallSideEffect                : ~m?
-#-----|   SEH Exception -> Block 4
+#-----|   Goto|SEH Exception -> Block 4
 
 #   26|   Block 4
 #   26|     r26_1(glval<unknown>) = FunctionAddress[sink] : 
@@ -37266,7 +37266,7 @@ try_except.cpp:
 #   23|     r23_2(int)            = Constant[0]                    : 
 #   23|     v23_3(void)           = Call[ProbeFunction]            : func:r23_1, 0:r23_2
 #   23|     mu23_4(unknown)       = ^CallSideEffect                : ~m?
-#-----|   SEH Exception -> Block 4
+#-----|   Goto|SEH Exception -> Block 4
 
 #   26|   Block 4
 #   26|     r26_1(glval<unknown>) = FunctionAddress[sink] :