Rust: Macro call resolution

rust/ql/integration-tests/hello-workspace/exe/src/main.rs

@@ -1,7 +1,10 @@
 use lib::a_module::hello; // $ item=HELLO
 
+use lib::my_macro2; // $ item=my_macro2
+
 mod a_module;
 
 fn main() {
+    my_macro2!(); // $ item=my_macro2
     hello(); // $ item=HELLO
 }

rust/ql/integration-tests/hello-workspace/functions.expected

@@ -1,2 +1,2 @@
-| exe/src/main.rs:5:1:7:1 | fn main |
-| lib/src/a_module/mod.rs:1:1:3:1 | fn hello |
+| exe/src/main.rs:7:1:10:1 | fn main |
+| lib/src/a_module/mod.rs:1:1:4:1 | fn hello |

rust/ql/integration-tests/hello-workspace/lib/src/a_module/mod.rs

@@ -1,3 +1,4 @@
 pub fn hello() {
-    println!("Hello, world!");
+    my_macro2!(); // $ item=my_macro2
+    println!("Hello, world!"); // $ item=println
 } // HELLO

rust/ql/integration-tests/hello-workspace/lib/src/lib.rs

@@ -1 +1,17 @@
+#[macro_use]
+mod macros {
+    #[macro_export]
+    macro_rules! my_macro1 {
+        () => {
+            println!("my_macro!");
+        };
+    }
+    #[macro_export]
+    macro_rules! my_macro2 {
+        () => {
+            $crate::my_macro1!();
+        };
+    }
+}
+
 pub mod a_module;

rust/ql/integration-tests/hello-workspace/path-resolution.expected

@@ -0,0 +1,4 @@
+testFailures
+resolveDollarCrate
+| exe/src/main.rs:8:5:8:14 | $crate | lib/src/lib.rs:0:0:0:0 | Crate(lib@0.1.0) |
+| lib/src/a_module/mod.rs:2:5:2:14 | $crate | lib/src/lib.rs:0:0:0:0 | Crate(lib@0.1.0) |

rust/ql/integration-tests/hello-workspace/path-resolution.ql

@@ -1 +1,10 @@
+import rust
+import codeql.rust.internal.PathResolution
 import utils.test.PathResolutionInlineExpectationsTest
+
+query predicate resolveDollarCrate(RelevantPath p, Crate c) {
+  c = resolvePath(p) and
+  p.isDollarCrate() and
+  p.fromSource() and
+  c.fromSource()
+}

rust/ql/integration-tests/hello-workspace/summary.cargo.expected

@@ -9,8 +9,8 @@
 | Inconsistencies - Path resolution | 0 |
 | Inconsistencies - SSA | 0 |
 | Inconsistencies - data flow | 0 |
-| Lines of code extracted | 9 |
-| Lines of user code extracted | 9 |
-| Macro calls - resolved | 2 |
-| Macro calls - total | 2 |
+| Lines of code extracted | 21 |
+| Lines of user code extracted | 21 |
+| Macro calls - resolved | 10 |
+| Macro calls - total | 10 |
 | Macro calls - unresolved | 0 |

rust/ql/integration-tests/hello-workspace/summary.rust-project.expected

@@ -9,8 +9,8 @@
 | Inconsistencies - Path resolution | 0 |
 | Inconsistencies - SSA | 0 |
 | Inconsistencies - data flow | 0 |
-| Lines of code extracted | 9 |
-| Lines of user code extracted | 9 |
-| Macro calls - resolved | 2 |
-| Macro calls - total | 2 |
+| Lines of code extracted | 21 |
+| Lines of user code extracted | 21 |
+| Macro calls - resolved | 10 |
+| Macro calls - total | 10 |
 | Macro calls - unresolved | 0 |

rust/ql/lib/codeql/rust/elements/internal/MacroCallImpl.qll

@@ -12,6 +12,7 @@ private import codeql.rust.elements.internal.generated.MacroCall
  */
 module Impl {
   private import rust
+  private import codeql.rust.internal.PathResolution
 
   pragma[nomagic]
   predicate isInMacroExpansion(AstNode root, AstNode n) {
@@ -44,5 +45,12 @@ module Impl {
       isInMacroExpansion(this, result) and
       this.getTokenTree().getLocation().contains(result.getLocation())
     }
+
+    /**
+     * Gets the macro definition that this macro call resolves to.
+     *
+     * The result is either a `MacroDef` or a `MacroRules`.
+     */
+    Item resolveMacro() { result = resolvePath(this.getPath()) }
   }
 }