Add barriers and barrier guards to MaD format explanations

cpp/ql/lib/semmle/code/cpp/dataflow/ExternalFlow.qll

@@ -10,6 +10,10 @@
  *   `namespace; type; subtypes; name; signature; ext; input; kind`
  * - Summaries:
  *   `namespace; type; subtypes; name; signature; ext; input; output; kind`
+ * - Barriers:
+ *   `namespace; type; subtypes; name; signature; ext; output; kind; provenance`
+ * - BarrierGuards:
+ *   `namespace; type; subtypes; name; signature; ext; input; acceptingvalue; kind; provenance`
  *
  * The interpretation of a row is similar to API-graphs with a left-to-right
  * reading.
@@ -86,7 +90,11 @@
  *    value, and
  *    - flow from the _second_ indirection of the 0th argument to the first
  *    indirection of the return value, etc.
- * 8. The `kind` column is a tag that can be referenced from QL to determine to
+ * 8. The `acceptingvalue` column of barrier guard models specifies the condition
+ *    under which the guard accepts or blocks flow. It can be one of "true" or
+ *    "false". In the future "no-exception", "not-zero", "null", "not-null" may be
+ *    supported.
+ * 9. The `kind` column is a tag that can be referenced from QL to determine to
  *    which classes the interpreted elements should be added. For example, for
  *    sources "remote" indicates a default remote flow source, and for summaries
  *    "taint" indicates a default additional taint step and "value" indicates a

csharp/ql/lib/semmle/code/csharp/dataflow/internal/ExternalFlow.qll

@@ -11,6 +11,10 @@
  *   `namespace; type; subtypes; name; signature; ext; input; kind; provenance`
  * - Summaries:
  *   `namespace; type; subtypes; name; signature; ext; input; output; kind; provenance`
+ * - Barriers:
+ *   `namespace; type; subtypes; name; signature; ext; output; kind; provenance`
+ * - BarrierGuards:
+ *   `namespace; type; subtypes; name; signature; ext; input; acceptingvalue; kind; provenance`
  * - Neutrals:
  *   `namespace; type; name; signature; kind; provenance`
  *   A neutral is used to indicate that a callable is neutral with respect to flow (no summary), source (is not a source) or sink (is not a sink).
@@ -69,14 +73,17 @@
  *    - "Field[f]": Selects the contents of field `f`.
  *    - "Property[p]": Selects the contents of property `p`.
  *
- * 8. The `kind` column is a tag that can be referenced from QL to determine to
+ * 8. The `acceptingvalue` column of barrier guard models specifies the condition
+ *    under which the guard accepts or blocks flow. It can be one of "true" or
+ *    "false", "no-exception", "not-zero", "null", "not-null".
+ * 9. The `kind` column is a tag that can be referenced from QL to determine to
  *    which classes the interpreted elements should be added. For example, for
  *    sources "remote" indicates a default remote flow source, and for summaries
  *    "taint" indicates a default additional taint step and "value" indicates a
  *    globally applicable value-preserving step. For neutrals the kind can be `summary`,
  *    `source` or `sink` to indicate that the neutral is neutral with respect to
  *    flow (no summary), source (is not a source) or sink (is not a sink).
- * 9. The `provenance` column is a tag to indicate the origin and verification of a model.
+ * 10. The `provenance` column is a tag to indicate the origin and verification of a model.
  *    The format is {origin}-{verification} or just "manual" where the origin describes
  *    the origin of the model and verification describes how the model has been verified.
  *    Some examples are:

go/ql/lib/semmle/go/dataflow/ExternalFlow.qll

@@ -11,6 +11,10 @@
  *   `package; type; subtypes; name; signature; ext; input; kind; provenance`
  * - Summaries:
  *   `package; type; subtypes; name; signature; ext; input; output; kind; provenance`
+ * - Barriers:
+ *   `package; type; subtypes; name; signature; ext; output; kind; provenance`
+ * - BarrierGuards:
+ *   `package; type; subtypes; name; signature; ext; input; acceptingvalue; kind; provenance`
  * - Neutrals:
  *   `package; type; name; signature; kind; provenance`
  *   A neutral is used to indicate that a callable is neutral with respect to flow (no summary), source (is not a source) or sink (is not a sink).
@@ -78,7 +82,11 @@
  *    - "MapValue": Selects a value in a map.
  *    - "Dereference": Selects the value referenced by a pointer.
  *
- * 8. The `kind` column is a tag that can be referenced from QL to determine to
+ * 8. The `acceptingvalue` column of barrier guard models specifies the condition
+ *    under which the guard accepts or blocks flow. It can be one of "true" or
+ *    "false". In the future "no-exception", "not-zero", "null", "not-null" may be
+ *    supported.
+ * 9. The `kind` column is a tag that can be referenced from QL to determine to
  *    which classes the interpreted elements should be added. For example, for
  *    sources "remote" indicates a default remote flow source, and for summaries
  *    "taint" indicates a default additional taint step and "value" indicates a

java/ql/lib/semmle/code/java/dataflow/ExternalFlow.qll

@@ -11,6 +11,10 @@
  *   `package; type; subtypes; name; signature; ext; input; kind; provenance`
  * - Summaries:
  *   `package; type; subtypes; name; signature; ext; input; output; kind; provenance`
+ * - Barriers:
+ *   `package; type; subtypes; name; signature; ext; output; kind; provenance`
+ * - BarrierGuards:
+ *   `package; type; subtypes; name; signature; ext; input; acceptingvalue; kind; provenance`
  * - Neutrals:
  *   `package; type; name; signature; kind; provenance`
  *   A neutral is used to indicate that a callable is neutral with respect to flow (no summary), source (is not a source) or sink (is not a sink).
@@ -69,14 +73,17 @@
  *      in the given range. The range is inclusive at both ends.
  *    - "ReturnValue": Selects the return value of a call to the selected element.
  *    - "Element": Selects the collection elements of the selected element.
- * 8. The `kind` column is a tag that can be referenced from QL to determine to
+ * 8. The `acceptingvalue` column of barrier guard models specifies the condition
+ *    under which the guard accepts or blocks flow. It can be one of "true" or
+ *    "false", "no-exception", "not-zero", "null", "not-null".
+ * 9. The `kind` column is a tag that can be referenced from QL to determine to
  *    which classes the interpreted elements should be added. For example, for
  *    sources "remote" indicates a default remote flow source, and for summaries
  *    "taint" indicates a default additional taint step and "value" indicates a
  *    globally applicable value-preserving step. For neutrals the kind can be `summary`,
  *    `source` or `sink` to indicate that the neutral is neutral with respect to
  *    flow (no summary), source (is not a source) or sink (is not a sink).
- * 9. The `provenance` column is a tag to indicate the origin and verification of a model.
+ * 10. The `provenance` column is a tag to indicate the origin and verification of a model.
  *    The format is {origin}-{verification} or just "manual" where the origin describes
  *    the origin of the model and verification describes how the model has been verified.
  *    Some examples are:

javascript/ql/lib/semmle/javascript/frameworks/data/internal/ApiGraphModels.qll

@@ -10,6 +10,10 @@
  *   `type, path, kind`
  * - Summaries:
  *   `type, path, input, output, kind`
+ * - Barriers:
+ *   `type, path, kind`
+ * - BarrierGuards:
+ *   `type, path, branch, kind`
  * - Types:
  *   `type1, type2, path`
  *
@@ -42,7 +46,8 @@
  * 3. The `input` and `output` columns specify how data enters and leaves the element selected by the
  *    first `(type, path)` tuple. Both strings are `.`-separated access paths
  *    of the same syntax as the `path` column.
- * 4. The `kind` column is a tag that can be referenced from QL to determine to
+ * 4. The `branch` column of barrier guard models specifies which branch of the guard is blocking flow. It can be "true" or "false".
+ * 5. The `kind` column is a tag that can be referenced from QL to determine to
  *    which classes the interpreted elements should be added. For example, for
  *    sources `"remote"` indicates a default remote flow source, and for summaries
  *    `"taint"` indicates a default additional taint step and `"value"` indicates a

python/ql/lib/semmle/python/frameworks/data/internal/ApiGraphModels.qll

@@ -10,6 +10,10 @@
  *   `type, path, kind`
  * - Summaries:
  *   `type, path, input, output, kind`
+ * - Barriers:
+ *   `type, path, kind`
+ * - BarrierGuards:
+ *   `type, path, branch, kind`
  * - Types:
  *   `type1, type2, path`
  *
@@ -42,7 +46,8 @@
  * 3. The `input` and `output` columns specify how data enters and leaves the element selected by the
  *    first `(type, path)` tuple. Both strings are `.`-separated access paths
  *    of the same syntax as the `path` column.
- * 4. The `kind` column is a tag that can be referenced from QL to determine to
+ * 4. The `branch` column of barrier guard models specifies which branch of the guard is blocking flow. It can be "true" or "false".
+ * 5. The `kind` column is a tag that can be referenced from QL to determine to
  *    which classes the interpreted elements should be added. For example, for
  *    sources `"remote"` indicates a default remote flow source, and for summaries
  *    `"taint"` indicates a default additional taint step and `"value"` indicates a

ruby/ql/lib/codeql/ruby/frameworks/data/internal/ApiGraphModels.qll

@@ -10,6 +10,10 @@
  *   `type, path, kind`
  * - Summaries:
  *   `type, path, input, output, kind`
+ * - Barriers:
+ *   `type, path, kind`
+ * - BarrierGuards:
+ *   `type, path, branch, kind`
  * - Types:
  *   `type1, type2, path`
  *
@@ -42,7 +46,8 @@
  * 3. The `input` and `output` columns specify how data enters and leaves the element selected by the
  *    first `(type, path)` tuple. Both strings are `.`-separated access paths
  *    of the same syntax as the `path` column.
- * 4. The `kind` column is a tag that can be referenced from QL to determine to
+ * 4. The `branch` column of barrier guard models specifies which branch of the guard is blocking flow. It can be "true" or "false".
+ * 5. The `kind` column is a tag that can be referenced from QL to determine to
  *    which classes the interpreted elements should be added. For example, for
  *    sources `"remote"` indicates a default remote flow source, and for summaries
  *    `"taint"` indicates a default additional taint step and `"value"` indicates a

rust/ql/lib/codeql/rust/dataflow/internal/ModelsAsData.qll

@@ -9,6 +9,10 @@
  *   `path; input; kind; provenance`
  * - Summaries:
  *   `path; input; output; kind; provenance`
+ * - Barriers:
+ *   `path; output; kind; provenance`
+ * - BarrierGuards:
+ *   `path; input; branch; kind; provenance`
  *
  * The interpretation of a row is similar to API-graphs with a left-to-right
  * reading.
@@ -34,12 +38,15 @@
  *     - `Field[i]`: the `i`th element of a tuple.
  *     - `Reference`: the referenced value.
  *     - `Future`: the value being computed asynchronously.
- * 3. The `kind` column is a tag that can be referenced from QL to determine to
+ * 3. The `branch` column of barrier guard models specifies which branch of the
+ *    guard is blocking flow. It can be "true" or "false". In the future
+ *    "no-exception", "not-zero", "null", "not-null" may be supported.
+ * 4. The `kind` column is a tag that can be referenced from QL to determine to
  *    which classes the interpreted elements should be added. For example, for
  *    sources `"remote"` indicates a default remote flow source, and for summaries
  *    `"taint"` indicates a default additional taint step and `"value"` indicates a
  *    globally applicable value-preserving step.
- * 4. The `provenance` column is mainly used internally, and should be set to `"manual"` for
+ * 5. The `provenance` column is mainly used internally, and should be set to `"manual"` for
  *    all custom models.
  */