Shared: Support flow summaries from ReturnValues

cpp/ql/lib/semmle/code/cpp/dataflow/internal/FlowSummaryImpl.qll

@@ -6,6 +6,7 @@ private import cpp as Cpp
 private import codeql.dataflow.internal.FlowSummaryImpl
 private import codeql.dataflow.internal.AccessPathSyntax as AccessPath
 private import semmle.code.cpp.ir.dataflow.internal.DataFlowPrivate
+private import semmle.code.cpp.ir.dataflow.internal.DataFlowNodes
 private import semmle.code.cpp.ir.dataflow.internal.DataFlowUtil
 private import semmle.code.cpp.ir.dataflow.internal.DataFlowImplSpecific as DataFlowImplSpecific
 private import semmle.code.cpp.dataflow.ExternalFlow
@@ -20,8 +21,22 @@ module Input implements InputSig<Location, DataFlowImplSpecific::CppDataFlow> {
 
   class SinkBase = Void;
 
+  class FlowSummaryCallBase = CallInstruction;
+
   predicate callableFromSource(SummarizedCallableBase c) { exists(c.getBlock()) }
 
+  FlowSummaryCallBase getASourceCall(SummarizedCallableBase sc) {
+    result.getStaticCallTarget() = sc
+  }
+
+  DataFlowCallable getSummarizedCallableAsDataFlowCallable(SummarizedCallableBase c) {
+    result.asSummarizedCallable() = c
+  }
+
+  DataFlowCallable getSourceCallEnclosingCallable(FlowSummaryCallBase call) {
+    result.asSourceCallable() = call.getEnclosingFunction()
+  }
+
   ArgumentPosition callbackSelfParameterPosition() { result = TDirectPosition(-1) }
 
   ReturnKind getStandardReturnValueKind() { result = getReturnValueKind("") }
@@ -30,6 +45,10 @@ module Input implements InputSig<Location, DataFlowImplSpecific::CppDataFlow> {
     arg = repeatStars(result.(NormalReturnKind).getIndirectionIndex())
   }
 
+  ParameterPosition getFlowSummaryParameterPosition(ReturnKind rk) {
+    result = TFlowSummaryPosition(rk)
+  }
+
   string encodeParameterPosition(ParameterPosition pos) { result = pos.toString() }
 
   string encodeArgumentPosition(ArgumentPosition pos) { result = pos.toString() }
@@ -114,10 +133,22 @@ module Input implements InputSig<Location, DataFlowImplSpecific::CppDataFlow> {
 private import Make<Location, DataFlowImplSpecific::CppDataFlow, Input> as Impl
 
 private module StepsInput implements Impl::Private::StepsInputSig {
+  Impl::Private::SummaryNode getSummaryNode(Node n) {
+    result = n.(FlowSummaryNode).getSummaryNode()
+  }
+
   DataFlowCall getACall(Public::SummarizedCallable sc) {
     result.getStaticCallTarget().getUnderlyingCallable() = sc
   }
 
+  Node getSourceOutNode(Input::FlowSummaryCallBase call, ReturnKind rk) {
+    exists(IndirectReturnOutNode out | result = out |
+      out.getCallInstruction() = call and
+      pragma[only_bind_out](rk.(NormalReturnKind).getIndirectionIndex()) =
+        pragma[only_bind_out](out.getIndirectionIndex())
+    )
+  }
+
   DataFlowCallable getSourceNodeEnclosingCallable(Input::SourceBase source) { none() }
 
   Node getSourceNode(Input::SourceBase source, Impl::Private::SummaryComponentStack s) { none() }

cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/DataFlowNodes.qll

@@ -1534,12 +1534,8 @@ class FlowSummaryNode extends Node, TFlowSummaryNode {
     result = this.getSummaryNode().getSummarizedCallable()
   }
 
-  /**
-   * Gets the enclosing callable. For a `FlowSummaryNode` this is always the
-   * summarized function this node is part of.
-   */
   override DataFlowCallable getEnclosingCallable() {
-    result.asSummarizedCallable() = this.getSummarizedCallable()
+    result = FlowSummaryImpl::Private::getEnclosingCallable(this.getSummaryNode())
   }
 
   override Location getLocationImpl() { result = this.getSummarizedCallable().getLocation() }

cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/DataFlowPrivate.qll

@@ -561,6 +561,21 @@ class SummaryArgumentNode extends ArgumentNode, FlowSummaryNode {
   }
 }
 
+/** An argument node that re-enters return output as input to a flow summary. */
+private class FlowSummaryArgumentNode extends ArgumentNode, FlowSummaryNode {
+  private CallInstruction callInstruction;
+  private ReturnKind rk;
+
+  FlowSummaryArgumentNode() {
+    this.getSummaryNode() = FlowSummaryImpl::Private::summaryArgumentNode(callInstruction, rk)
+  }
+
+  override predicate argumentOf(DataFlowCall call, ArgumentPosition pos) {
+    call.asCallInstruction() = callInstruction and
+    pos = TFlowSummaryPosition(rk)
+  }
+}
+
 /** A parameter position represented by an integer. */
 class ParameterPosition = Position;
 
@@ -616,6 +631,18 @@ class IndirectionPosition extends Position, TIndirectionPosition {
   final override int getIndirectionIndex() { result = indirectionIndex }
 }
 
+class FlowSummaryPosition extends Position, TFlowSummaryPosition {
+  ReturnKind rk;
+
+  FlowSummaryPosition() { this = TFlowSummaryPosition(rk) }
+
+  override string toString() { result = "write to: " + rk.toString() }
+
+  override int getArgumentIndex() { none() }
+
+  final override int getIndirectionIndex() { result = rk.getIndirectionIndex() }
+}
+
 newtype TPosition =
   TDirectPosition(int argumentIndex) {
     exists(any(CallInstruction c).getArgument(argumentIndex))
@@ -634,7 +661,8 @@ newtype TPosition =
       p = f.getParameter(argumentIndex) and
       indirectionIndex = [1 .. Ssa::getMaxIndirectionsForType(p.getUnspecifiedType()) - 1]
     )
-  }
+  } or
+  TFlowSummaryPosition(ReturnKind rk) { FlowSummaryImpl::Private::relevantFlowSummaryPosition(rk) }
 
 private newtype TReturnKind =
   TNormalReturnKind(int indirectionIndex) {

cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/DataFlowUtil.qll

@@ -158,7 +158,7 @@ private module Cached {
     model = ""
     or
     // models-as-data summarized flow
-    FlowSummaryImpl::Private::Steps::summaryLocalStep(nodeFrom.(FlowSummaryNode).getSummaryNode(),
+    FlowSummaryImpl::Private::Steps::summaryLocalStep(nodeFrom,
       nodeTo.(FlowSummaryNode).getSummaryNode(), true, model)
   }
 

cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/TaintTrackingUtil.qll

@@ -67,7 +67,7 @@ private module Cached {
     model = ""
     or
     // models-as-data summarized flow
-    FlowSummaryImpl::Private::Steps::summaryLocalStep(nodeFrom.(FlowSummaryNode).getSummaryNode(),
+    FlowSummaryImpl::Private::Steps::summaryLocalStep(nodeFrom,
       nodeTo.(FlowSummaryNode).getSummaryNode(), false, model)
     or
     // object->field conflation for content that is a `TaintInheritingContent`.

cpp/ql/test/library-tests/dataflow/external-models/flow.expected

@@ -53,14 +53,17 @@ models
 | 52 | Summary: ; ; false; ymlStepGenerated; ; ; Argument[0]; ReturnValue; taint; df-generated |
 | 53 | Summary: ; ; false; ymlStepManual; ; ; Argument[0]; ReturnValue; taint; manual |
 | 54 | Summary: ; ; false; ymlStepManual_with_body; ; ; Argument[0]; ReturnValue; taint; manual |
-| 55 | Summary: ; TemplateClass1; true; templateFunction2<U,V>; (U,V); ; Argument[1]; ReturnValue; value; manual |
-| 56 | Summary: ; TemplateClass1<T>; false; templateFunction<U>; (T,U); ; Argument[0]; ReturnValue; value; manual |
-| 57 | Summary: ; TemplateClass2<T,U>; true; function; (U,T); ; Argument[1]; ReturnValue; value; manual |
-| 58 | Summary: Azure::Core::IO; BodyStream; true; Read; ; ; Argument[-1]; Argument[*0]; taint; manual |
-| 59 | Summary: Azure::Core::IO; BodyStream; true; ReadToCount; ; ; Argument[-1]; Argument[*0]; taint; manual |
-| 60 | Summary: Azure::Core::IO; BodyStream; true; ReadToEnd; ; ; Argument[-1]; ReturnValue.Element; taint; manual |
-| 61 | Summary: Azure; Nullable; true; Value; ; ; Argument[-1]; ReturnValue[*]; taint; manual |
-| 62 | Summary: boost::asio; ; false; buffer; ; ; Argument[*0]; ReturnValue; taint; manual |
+| 55 | Summary: ; MyString; true; operator[]; ; ; Argument[-1]; ReturnValue[*]; taint; manual |
+| 56 | Summary: ; MyString; true; operator[]; ; ; ReturnValue[*]; Argument[-1]; taint; manual |
+| 57 | Summary: ; ReverseFlow; true; get_ptr; ; ; ReturnValue[*]; Argument[-1].Field[ReverseFlow::value]; value; manual |
+| 58 | Summary: ; TemplateClass1; true; templateFunction2<U,V>; (U,V); ; Argument[1]; ReturnValue; value; manual |
+| 59 | Summary: ; TemplateClass1<T>; false; templateFunction<U>; (T,U); ; Argument[0]; ReturnValue; value; manual |
+| 60 | Summary: ; TemplateClass2<T,U>; true; function; (U,T); ; Argument[1]; ReturnValue; value; manual |
+| 61 | Summary: Azure::Core::IO; BodyStream; true; Read; ; ; Argument[-1]; Argument[*0]; taint; manual |
+| 62 | Summary: Azure::Core::IO; BodyStream; true; ReadToCount; ; ; Argument[-1]; Argument[*0]; taint; manual |
+| 63 | Summary: Azure::Core::IO; BodyStream; true; ReadToEnd; ; ; Argument[-1]; ReturnValue.Element; taint; manual |
+| 64 | Summary: Azure; Nullable; true; Value; ; ; Argument[-1]; ReturnValue[*]; taint; manual |
+| 65 | Summary: boost::asio; ; false; buffer; ; ; Argument[*0]; ReturnValue; taint; manual |
 edges
 | asio_streams.cpp:87:34:87:44 | read_until output argument | asio_streams.cpp:91:7:91:17 | recv_buffer | provenance | Src:MaD:32  |
 | asio_streams.cpp:87:34:87:44 | read_until output argument | asio_streams.cpp:93:29:93:39 | *recv_buffer | provenance | Src:MaD:32 Sink:MaD:2 |
@@ -69,16 +72,16 @@ edges
 | asio_streams.cpp:100:44:100:62 | call to buffer | asio_streams.cpp:100:44:100:62 | call to buffer | provenance |  |
 | asio_streams.cpp:100:44:100:62 | call to buffer | asio_streams.cpp:101:7:101:17 | send_buffer | provenance |  |
 | asio_streams.cpp:100:44:100:62 | call to buffer | asio_streams.cpp:103:29:103:39 | *send_buffer | provenance | Sink:MaD:2 |
-| asio_streams.cpp:100:64:100:71 | *send_str | asio_streams.cpp:100:44:100:62 | call to buffer | provenance | MaD:62 |
+| asio_streams.cpp:100:64:100:71 | *send_str | asio_streams.cpp:100:44:100:62 | call to buffer | provenance | MaD:65 |
 | azure.cpp:253:48:253:60 | *call to GetBodyStream | azure.cpp:253:48:253:60 | *call to GetBodyStream | provenance | Src:MaD:29  |
 | azure.cpp:253:48:253:60 | *call to GetBodyStream | azure.cpp:257:5:257:8 | *resp | provenance |  |
 | azure.cpp:253:48:253:60 | *call to GetBodyStream | azure.cpp:262:5:262:8 | *resp | provenance |  |
 | azure.cpp:253:48:253:60 | *call to GetBodyStream | azure.cpp:266:38:266:41 | *resp | provenance |  |
-| azure.cpp:257:5:257:8 | *resp | azure.cpp:257:16:257:21 | Read output argument | provenance | MaD:58 |
+| azure.cpp:257:5:257:8 | *resp | azure.cpp:257:16:257:21 | Read output argument | provenance | MaD:61 |
 | azure.cpp:257:16:257:21 | Read output argument | azure.cpp:258:10:258:16 | * ... | provenance |  |
-| azure.cpp:262:5:262:8 | *resp | azure.cpp:262:23:262:28 | ReadToCount output argument | provenance | MaD:59 |
+| azure.cpp:262:5:262:8 | *resp | azure.cpp:262:23:262:28 | ReadToCount output argument | provenance | MaD:62 |
 | azure.cpp:262:23:262:28 | ReadToCount output argument | azure.cpp:263:10:263:16 | * ... | provenance |  |
-| azure.cpp:266:38:266:41 | *resp | azure.cpp:266:44:266:52 | call to ReadToEnd [element] | provenance | MaD:60 |
+| azure.cpp:266:38:266:41 | *resp | azure.cpp:266:44:266:52 | call to ReadToEnd [element] | provenance | MaD:63 |
 | azure.cpp:266:44:266:52 | call to ReadToEnd [element] | azure.cpp:266:44:266:52 | call to ReadToEnd [element] | provenance |  |
 | azure.cpp:266:44:266:52 | call to ReadToEnd [element] | azure.cpp:267:10:267:12 | vec [element] | provenance |  |
 | azure.cpp:267:10:267:12 | vec [element] | azure.cpp:267:10:267:12 | vec | provenance |  |
@@ -94,10 +97,10 @@ edges
 | azure.cpp:278:10:278:13 | body | azure.cpp:278:10:278:13 | body | provenance |  |
 | azure.cpp:281:68:281:84 | *call to ExtractBodyStream | azure.cpp:281:68:281:84 | *call to ExtractBodyStream | provenance | Src:MaD:26  |
 | azure.cpp:281:68:281:84 | *call to ExtractBodyStream | azure.cpp:282:21:282:23 | *call to get | provenance |  |
-| azure.cpp:282:21:282:23 | *call to get | azure.cpp:282:28:282:36 | call to ReadToEnd [element] | provenance | MaD:60 |
+| azure.cpp:282:21:282:23 | *call to get | azure.cpp:282:28:282:36 | call to ReadToEnd [element] | provenance | MaD:63 |
 | azure.cpp:282:28:282:36 | call to ReadToEnd [element] | azure.cpp:282:10:282:38 | call to ReadToEnd | provenance |  |
 | azure.cpp:282:28:282:36 | call to ReadToEnd [element] | azure.cpp:282:28:282:36 | call to ReadToEnd [element] | provenance |  |
-| azure.cpp:289:24:289:56 | call to GetHeader | azure.cpp:289:63:289:65 | call to Value | provenance | MaD:61 |
+| azure.cpp:289:24:289:56 | call to GetHeader | azure.cpp:289:63:289:65 | call to Value | provenance | MaD:64 |
 | azure.cpp:289:32:289:40 | call to GetHeader | azure.cpp:289:24:289:56 | call to GetHeader | provenance |  |
 | azure.cpp:289:32:289:40 | call to GetHeader | azure.cpp:289:32:289:40 | call to GetHeader | provenance | Src:MaD:30  |
 | azure.cpp:289:63:289:65 | call to Value | azure.cpp:289:63:289:65 | call to Value | provenance |  |
@@ -159,27 +162,27 @@ edges
 | test.cpp:133:10:133:18 | call to ymlSource | test.cpp:134:45:134:45 | x | provenance |  |
 | test.cpp:134:13:134:43 | call to templateFunction | test.cpp:134:13:134:43 | call to templateFunction | provenance |  |
 | test.cpp:134:13:134:43 | call to templateFunction | test.cpp:135:10:135:10 | y | provenance | Sink:MaD:1 |
-| test.cpp:134:45:134:45 | x | test.cpp:134:13:134:43 | call to templateFunction | provenance | MaD:56 |
+| test.cpp:134:45:134:45 | x | test.cpp:134:13:134:43 | call to templateFunction | provenance | MaD:59 |
 | test.cpp:146:10:146:18 | call to ymlSource | test.cpp:146:10:146:18 | call to ymlSource | provenance | Src:MaD:25  |
 | test.cpp:146:10:146:18 | call to ymlSource | test.cpp:148:26:148:26 | x | provenance |  |
 | test.cpp:148:10:148:27 | call to function | test.cpp:148:10:148:27 | call to function | provenance |  |
 | test.cpp:148:10:148:27 | call to function | test.cpp:149:10:149:10 | z | provenance | Sink:MaD:1 |
-| test.cpp:148:26:148:26 | x | test.cpp:148:10:148:27 | call to function | provenance | MaD:57 |
+| test.cpp:148:26:148:26 | x | test.cpp:148:10:148:27 | call to function | provenance | MaD:60 |
 | test.cpp:155:10:155:18 | call to ymlSource | test.cpp:155:10:155:18 | call to ymlSource | provenance | Src:MaD:25  |
 | test.cpp:155:10:155:18 | call to ymlSource | test.cpp:157:26:157:26 | x | provenance |  |
 | test.cpp:157:13:157:20 | call to function | test.cpp:157:13:157:20 | call to function | provenance |  |
 | test.cpp:157:13:157:20 | call to function | test.cpp:158:10:158:10 | z | provenance | Sink:MaD:1 |
-| test.cpp:157:26:157:26 | x | test.cpp:157:13:157:20 | call to function | provenance | MaD:57 |
+| test.cpp:157:26:157:26 | x | test.cpp:157:13:157:20 | call to function | provenance | MaD:60 |
 | test.cpp:164:34:164:34 | x | test.cpp:165:69:165:69 | x | provenance |  |
 | test.cpp:165:12:165:64 | call to templateFunction2 | test.cpp:164:7:164:7 | *templateFunction3 | provenance |  |
 | test.cpp:165:12:165:64 | call to templateFunction2 | test.cpp:165:12:165:64 | call to templateFunction2 | provenance |  |
-| test.cpp:165:69:165:69 | x | test.cpp:165:12:165:64 | call to templateFunction2 | provenance | MaD:55 |
+| test.cpp:165:69:165:69 | x | test.cpp:165:12:165:64 | call to templateFunction2 | provenance | MaD:58 |
 | test.cpp:170:10:170:18 | call to ymlSource | test.cpp:170:10:170:18 | call to ymlSource | provenance | Src:MaD:25  |
 | test.cpp:170:10:170:18 | call to ymlSource | test.cpp:172:51:172:51 | x | provenance |  |
 | test.cpp:172:13:172:44 | call to templateFunction3 | test.cpp:172:13:172:44 | call to templateFunction3 | provenance |  |
 | test.cpp:172:13:172:44 | call to templateFunction3 | test.cpp:173:10:173:10 | y | provenance | Sink:MaD:1 |
 | test.cpp:172:51:172:51 | x | test.cpp:164:34:164:34 | x | provenance |  |
-| test.cpp:172:51:172:51 | x | test.cpp:172:13:172:44 | call to templateFunction3 | provenance | MaD:55 |
+| test.cpp:172:51:172:51 | x | test.cpp:172:13:172:44 | call to templateFunction3 | provenance | MaD:58 |
 | test.cpp:186:2:186:2 | *s [post update] [myField] | test.cpp:187:33:187:34 | *& ... [myField] | provenance |  |
 | test.cpp:186:2:186:24 | ... = ... | test.cpp:186:2:186:2 | *s [post update] [myField] | provenance |  |
 | test.cpp:186:14:186:22 | call to ymlSource | test.cpp:186:2:186:24 | ... = ... | provenance | Src:MaD:25  |
@@ -192,6 +195,18 @@ edges
 | test.cpp:200:10:200:33 | call to read_field_from_struct_2 | test.cpp:200:10:200:33 | call to read_field_from_struct_2 | provenance |  |
 | test.cpp:200:10:200:33 | call to read_field_from_struct_2 | test.cpp:201:10:201:10 | x | provenance | Sink:MaD:1 |
 | test.cpp:200:35:200:36 | *& ... [myField] | test.cpp:200:10:200:33 | call to read_field_from_struct_2 | provenance | MaD:51 |
+| test.cpp:216:3:216:4 | get_ptr output argument [value] | test.cpp:217:11:217:12 | *rf [value] | provenance |  |
+| test.cpp:216:3:216:28 | ... = ... | test.cpp:216:3:216:4 | get_ptr output argument [value] | provenance | MaD:57 |
+| test.cpp:216:18:216:26 | call to ymlSource | test.cpp:216:3:216:28 | ... = ... | provenance | Src:MaD:25  |
+| test.cpp:217:11:217:12 | *rf [value] | test.cpp:217:14:217:18 | value | provenance |  |
+| test.cpp:217:14:217:18 | value | test.cpp:217:14:217:18 | value | provenance |  |
+| test.cpp:217:14:217:18 | value | test.cpp:218:11:218:11 | x | provenance | Sink:MaD:1 |
+| test.cpp:222:3:222:3 | operator[] output argument | test.cpp:223:12:223:12 | *s | provenance |  |
+| test.cpp:222:3:222:20 | ... = ... | test.cpp:222:3:222:3 | operator[] output argument | provenance | MaD:56 |
+| test.cpp:222:10:222:20 | call to ymlSource | test.cpp:222:3:222:20 | ... = ... | provenance | Src:MaD:25  |
+| test.cpp:223:12:223:12 | *s | test.cpp:223:13:223:15 | call to operator[] | provenance | MaD:55 |
+| test.cpp:223:13:223:15 | call to operator[] | test.cpp:223:13:223:15 | call to operator[] | provenance |  |
+| test.cpp:223:13:223:15 | call to operator[] | test.cpp:224:11:224:11 | c | provenance | Sink:MaD:1 |
 | windows.cpp:22:15:22:29 | *call to GetCommandLineA | windows.cpp:22:15:22:29 | *call to GetCommandLineA | provenance | Src:MaD:3  |
 | windows.cpp:22:15:22:29 | *call to GetCommandLineA | windows.cpp:24:8:24:11 | * ... | provenance |  |
 | windows.cpp:22:15:22:29 | *call to GetCommandLineA | windows.cpp:27:36:27:38 | *cmd | provenance |  |
@@ -470,6 +485,20 @@ nodes
 | test.cpp:200:10:200:33 | call to read_field_from_struct_2 | semmle.label | call to read_field_from_struct_2 |
 | test.cpp:200:35:200:36 | *& ... [myField] | semmle.label | *& ... [myField] |
 | test.cpp:201:10:201:10 | x | semmle.label | x |
+| test.cpp:216:3:216:4 | get_ptr output argument [value] | semmle.label | get_ptr output argument [value] |
+| test.cpp:216:3:216:28 | ... = ... | semmle.label | ... = ... |
+| test.cpp:216:18:216:26 | call to ymlSource | semmle.label | call to ymlSource |
+| test.cpp:217:11:217:12 | *rf [value] | semmle.label | *rf [value] |
+| test.cpp:217:14:217:18 | value | semmle.label | value |
+| test.cpp:217:14:217:18 | value | semmle.label | value |
+| test.cpp:218:11:218:11 | x | semmle.label | x |
+| test.cpp:222:3:222:3 | operator[] output argument | semmle.label | operator[] output argument |
+| test.cpp:222:3:222:20 | ... = ... | semmle.label | ... = ... |
+| test.cpp:222:10:222:20 | call to ymlSource | semmle.label | call to ymlSource |
+| test.cpp:223:12:223:12 | *s | semmle.label | *s |
+| test.cpp:223:13:223:15 | call to operator[] | semmle.label | call to operator[] |
+| test.cpp:223:13:223:15 | call to operator[] | semmle.label | call to operator[] |
+| test.cpp:224:11:224:11 | c | semmle.label | c |
 | windows.cpp:22:15:22:29 | *call to GetCommandLineA | semmle.label | *call to GetCommandLineA |
 | windows.cpp:22:15:22:29 | *call to GetCommandLineA | semmle.label | *call to GetCommandLineA |
 | windows.cpp:24:8:24:11 | * ... | semmle.label | * ... |

cpp/ql/test/library-tests/dataflow/external-models/flow.ext.yml

@@ -23,4 +23,7 @@ extensions:
       - ["", "TemplateClass1", True, "templateFunction2<U,V>", "(U,V)", "", "Argument[1]", "ReturnValue", "value", "manual"]
       - ["", "TemplateClass2<T,U>", True, "function", "(U,T)", "", "Argument[1]", "ReturnValue", "value", "manual"]
       - ["", "", False, "read_field_from_struct", "", "", "Argument[*0].Field[MyNamespace::MyStructInNamespace::myField]", "ReturnValue", "value", "manual"]
-      - ["", "", False, "read_field_from_struct_2", "", "", "Argument[*0].Field[MyGlobalStruct::myField]", "ReturnValue", "value", "manual"]
+      - ["", "", False, "read_field_from_struct_2", "", "", "Argument[*0].Field[MyGlobalStruct::myField]", "ReturnValue", "value", "manual"]
+      - ["", "ReverseFlow", True, "get_ptr", "", "", "ReturnValue[*]", "Argument[-1].Field[ReverseFlow::value]", "value", "manual"]
+      - ["", "MyString", True, "operator[]", "", "", "ReturnValue[*]", "Argument[-1]", "taint", "manual"]
+      - ["", "MyString", True, "operator[]", "", "", "Argument[-1]", "ReturnValue[*]", "taint", "manual"]