Fix operator precedence bug in Rust parser

PR rust/29859 points out an operator precedence bug in the Rust
parser.  This patch fixes it and adds a regression test.

diff --git a/gdb/rust-parse.c b/gdb/rust-parse.c
index f5eb63ec1e3e856240499f79bc391dbd12024b54..337927219d55af668674b03fc47d39e10b746a89 100644 (file)
--- a/gdb/rust-parse.c
+++ b/gdb/rust-parse.c
@@ -1398,7 +1398,7 @@ rust_parser::parse_binop (bool required)
          break;
         }
 
-      while (precedence < operator_stack.back ().precedence
+      while (precedence <= operator_stack.back ().precedence
             && operator_stack.size () > 1)
        {
          rustop_item rhs = std::move (operator_stack.back ());

diff --git a/gdb/testsuite/gdb.rust/simple.exp b/gdb/testsuite/gdb.rust/simple.exp
index 252c47baac52ae6f7c9513ef33067edc64099978..3a010f30ea66bdbb8fd3cdcd3d29c7351ad7b44a 100644 (file)
--- a/gdb/testsuite/gdb.rust/simple.exp
+++ b/gdb/testsuite/gdb.rust/simple.exp
@@ -412,3 +412,7 @@ if {[lindex $v 0] >= 8} {
     gdb_test "python print(gdb.lookup_type('simple::MoreComplicated').dynamic)" \
        "True"
 }
+
+# The new parser introduced an operator precedence bug.
+gdb_test "print 5 * 7 / 5" " = 7"
+gdb_test "print 4 - 3 - 1" " = 0"