[COMMITTED 15/19] gccrs: Add `#[track_caller]` as known attribute

[arthur . cohen]

From: beamandala <mandalapubhav...@gmail.com>

gcc/rust/ChangeLog:

        * expand/rust-macro-builtins.cc (MacroBuiltin::builtin_transcribers):
        Add entry for track_caller.
        * util/rust-attribute-values.h: add `TRACK_CALLER` attribute.
        * util/rust-attributes.cc: add `track_caller` attribute definition.

gcc/testsuite/ChangeLog:

        * rust/compile/track_caller.rs: New test.

Signed-off-by: Bhavesh Mandalapu <mandalapubhav...@gmail.com>
---
 gcc/rust/expand/rust-macro-builtins.cc     | 1 +
 gcc/rust/util/rust-attribute-values.h      | 1 +
 gcc/rust/util/rust-attributes.cc           | 3 ++-
 gcc/testsuite/rust/compile/track_caller.rs | 6 ++++++
 4 files changed, 10 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/rust/compile/track_caller.rs

diff --git a/gcc/rust/expand/rust-macro-builtins.cc 
b/gcc/rust/expand/rust-macro-builtins.cc
index 39c4c46b8e0..a1388fb1dfb 100644
--- a/gcc/rust/expand/rust-macro-builtins.cc
+++ b/gcc/rust/expand/rust-macro-builtins.cc
@@ -137,6 +137,7 @@ std::unordered_map<std::string, AST::MacroTranscriberFunc>
     {"cfg_accessible", MacroBuiltin::sorry},
     {"rustc_const_stable", MacroBuiltin::sorry},
     {"rustc_const_unstable", MacroBuiltin::sorry},
+    {"track_caller", MacroBuiltin::sorry},
     /* Derive builtins do not need a real transcriber, but still need one. It
        should however never be called since builtin derive macros get expanded
        differently, and benefit from knowing on what kind of items they are
diff --git a/gcc/rust/util/rust-attribute-values.h 
b/gcc/rust/util/rust-attribute-values.h
index 9ef5cc52e81..d579fa29801 100644
--- a/gcc/rust/util/rust-attribute-values.h
+++ b/gcc/rust/util/rust-attribute-values.h
@@ -58,6 +58,7 @@ public:
   static constexpr auto &RUSTC_CONST_UNSTABLE = "rustc_const_unstable";
   static constexpr auto &MAY_DANGLE = "may_dangle";
   static constexpr auto &PRELUDE_IMPORT = "prelude_import";
+  static constexpr auto &TRACK_CALLER = "track_caller";
 };
 } // namespace Values
 } // namespace Rust
diff --git a/gcc/rust/util/rust-attributes.cc b/gcc/rust/util/rust-attributes.cc
index 03452c75bd8..df0fe1b0bca 100644
--- a/gcc/rust/util/rust-attributes.cc
+++ b/gcc/rust/util/rust-attributes.cc
@@ -75,7 +75,8 @@ static const BuiltinAttrDefinition __definitions[]
      // assuming we keep these for static analysis
      {Attrs::RUSTC_CONST_STABLE, STATIC_ANALYSIS},
      {Attrs::RUSTC_CONST_UNSTABLE, STATIC_ANALYSIS},
-     {Attrs::PRELUDE_IMPORT, NAME_RESOLUTION}};
+     {Attrs::PRELUDE_IMPORT, NAME_RESOLUTION},
+     {Attrs::TRACK_CALLER, CODE_GENERATION}};
 
 BuiltinAttributeMappings *
 BuiltinAttributeMappings::get ()
diff --git a/gcc/testsuite/rust/compile/track_caller.rs 
b/gcc/testsuite/rust/compile/track_caller.rs
new file mode 100644
index 00000000000..fd1d8429588
--- /dev/null
+++ b/gcc/testsuite/rust/compile/track_caller.rs
@@ -0,0 +1,6 @@
+#[track_caller]
+fn foo() {}
+
+fn main() {
+    foo();
+}
-- 
2.49.0