Add line builtin macro

Signed-off-by: Sebastien Lacoste <dev@graphman.fr>

4 files changed, 39 insertions, 0 deletions

diff --git a/gcc/rust/expand/rust-macro-builtins.cc b/gcc/rust/expand/rust-macro-builtins.cc
index d062f1a..2b175fc 100644
--- a/gcc/rust/expand/rust-macro-builtins.cc
+++ b/gcc/rust/expand/rust-macro-builtins.cc
@@ -467,4 +467,17 @@ MacroBuiltin::include (Location invoc_locus, AST::MacroInvocData &invoc)
   return AST::ASTFragment (nodes);
 }
 
+AST::ASTFragment
+MacroBuiltin::line (Location invoc_locus, AST::MacroInvocData &invoc)
+{
+  auto current_line
+    = Session::get_instance ().linemap->location_to_line (invoc_locus);
+
+  auto line_no = AST::SingleASTNode (std::unique_ptr<AST::Expr> (
+    new AST::LiteralExpr (std::to_string (current_line), AST::Literal::INT,
+			  PrimitiveCoreType::CORETYPE_U32, {}, invoc_locus)));
+
+  return AST::ASTFragment ({line_no});
+}
+
 } // namespace Rust
diff --git a/gcc/rust/expand/rust-macro-builtins.h b/gcc/rust/expand/rust-macro-builtins.h
index f1d10df..91f3727 100644
--- a/gcc/rust/expand/rust-macro-builtins.h
+++ b/gcc/rust/expand/rust-macro-builtins.h
@@ -98,6 +98,9 @@ public:
 
   static AST::ASTFragment include (Location invoc_locus,
 				   AST::MacroInvocData &invoc);
+
+  static AST::ASTFragment line (Location invoc_locus,
+				AST::MacroInvocData &invoc);
 };
 } // namespace Rust
 
diff --git a/gcc/rust/util/rust-hir-map.cc b/gcc/rust/util/rust-hir-map.cc
index c21b681..8b3be5c 100644
--- a/gcc/rust/util/rust-hir-map.cc
+++ b/gcc/rust/util/rust-hir-map.cc
@@ -831,6 +831,7 @@ Mappings::insert_macro_def (AST::MacroRulesDefinition *macro)
     builtin_macros = {
       {"assert", MacroBuiltin::assert},
       {"file", MacroBuiltin::file},
+      {"line", MacroBuiltin::line},
       {"column", MacroBuiltin::column},
       {"include_bytes", MacroBuiltin::include_bytes},
       {"include_str", MacroBuiltin::include_str},
diff --git a/gcc/testsuite/rust/execute/torture/builtin_macro_line.rs b/gcc/testsuite/rust/execute/torture/builtin_macro_line.rs
new file mode 100644
index 0000000..873054d
--- /dev/null
+++ b/gcc/testsuite/rust/execute/torture/builtin_macro_line.rs
@@ -0,0 +1,22 @@
+// { dg-output "15\n18\n" }
+extern "C" {
+    fn printf(fmt: *const i8, ...);
+}
+
+fn print(s: u32) {
+    printf("%u\n\0" as *const str as *const i8, s);
+}
+
+macro_rules! line {
+    () => {{}};
+}
+
+fn main() -> i32 {
+    let a = line!();
+    print(a);
+
+    let b = line!();
+    print(b);
+
+    0
+}