fix backtrace on argment error.

* vm_backtrace.c (rb_backtrace_use_iseq_first_lineno_for_last_location):
  added. It modifies last location's line as corresponding iseq's first line
  number.

* vm_args.c (raise_argument_error): use added function.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60725 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_method.rb

@@ -990,4 +990,31 @@ class TestMethod < Test::Unit::TestCase
     assert_equal('1', obj.foo(1))
     assert_equal('1', obj.bar(1))
   end
+
+  def test_argument_error_location
+    body = <<-'END_OF_BODY'
+    eval <<-'EOS'
+    $line_lambda = __LINE__; $f = lambda do
+      _x = 1
+    end
+    $line_method = __LINE__; def foo
+      _x = 1
+    end
+    begin
+      $f.call(1)
+    rescue ArgumentError => e
+      assert_equal "(eval):#{$line_lambda.to_s}:in `block in <main>'", e.backtrace.first
+    end
+    begin
+      foo(1)
+    rescue ArgumentError => e
+      assert_equal "(eval):#{$line_method}:in `foo'", e.backtrace.first
+    end
+    EOS
+    END_OF_BODY
+
+    assert_separately [], body
+    # without trace insn
+    assert_separately [], "RubyVM::InstructionSequence.compile_option = {trace_instruction: false}\n" + body
+  end
 end

vm_args.c

@@ -687,6 +687,8 @@ setup_parameters_complex(rb_execution_context_t * const ec, const rb_iseq_t * co
     return opt_pc;
 }
 
+void rb_backtrace_use_iseq_first_lineno_for_last_location(VALUE self); /* vm_backtrace.c */
+
 static void
 raise_argument_error(rb_execution_context_t *ec, const rb_iseq_t *iseq, const VALUE exc)
 {
@@ -698,6 +700,7 @@ raise_argument_error(rb_execution_context_t *ec, const rb_iseq_t *iseq, const VA
 		      iseq->body->iseq_encoded,
 		      ec->cfp->sp, 0, 0 /* stack_max */);
 	at = rb_ec_backtrace_object(ec);
+	rb_backtrace_use_iseq_first_lineno_for_last_location(at);
 	rb_vm_pop_frame(ec);
     }
     else {

vm_backtrace.c

@@ -585,6 +585,25 @@ rb_backtrace_to_str_ary(VALUE self)
     return bt->strary;
 }
 
+void
+rb_backtrace_use_iseq_first_lineno_for_last_location(VALUE self)
+{
+    const rb_backtrace_t *bt;
+    const rb_iseq_t *iseq;
+    rb_backtrace_location_t *loc;
+
+    GetCoreDataFromValue(self, rb_backtrace_t, bt);
+    VM_ASSERT(bt->backtrace_size > 0);
+
+    loc = &bt->backtrace[bt->backtrace_size - 1];
+    iseq = loc->body.iseq.iseq;
+
+    VM_ASSERT(loc->type == LOCATION_TYPE_ISEQ);
+
+    loc->body.iseq.lineno.lineno = FIX2INT(iseq->body->location.first_lineno);
+    loc->type = LOCATION_TYPE_ISEQ_CALCED;
+}
+
 static VALUE
 location_create(rb_backtrace_location_t *srcloc, void *btobj)
 {