Make eval(code, binding) use (eval) as __FILE__ and 1 as __LINE__

This removes the warning that was added in
3802fb92ff, and switches the behavior
so that the eval does not use the binding's __FILE__ and __LINE__
implicitly.

Fixes [Bug #4352]

parse.y

@@ -315,7 +315,6 @@ struct parser_params {
     unsigned int do_loop: 1;
     unsigned int do_chomp: 1;
     unsigned int do_split: 1;
-    unsigned int warn_location: 1;
 
     NODE *eval_tree_begin;
     NODE *eval_tree;
@@ -9917,19 +9916,6 @@ past_dvar_p(struct parser_params *p, ID id)
 }
 # endif
 
-/* As Ripper#warn does not have arguments for the location, so the
- * following messages cannot be separated */
-#define WARN_LOCATION(type) do { \
-    if (p->warn_location) { \
-	int line; \
-	VALUE file = rb_source_location(&line); \
-	rb_warn3(type" in eval may not return location in binding;" \
-		 " use Binding#source_location instead\n" \
-		 "%"PRIsWARN":%d: warning: in `%"PRIsWARN"'", \
-		 file, WARN_I(line), rb_id2str(rb_frame_this_func())); \
-    } \
-} while (0)
-
 static int
 numparam_nested_p(struct parser_params *p)
 {
@@ -9963,7 +9949,6 @@ gettable(struct parser_params *p, ID id, const YYLTYPE *loc)
       case keyword_false:
 	return NEW_FALSE(loc);
       case keyword__FILE__:
-	WARN_LOCATION("__FILE__");
 	{
 	    VALUE file = p->ruby_sourcefile_string;
 	    if (NIL_P(file))
@@ -9975,7 +9960,6 @@ gettable(struct parser_params *p, ID id, const YYLTYPE *loc)
 	}
 	return node;
       case keyword__LINE__:
-	WARN_LOCATION("__LINE__");
 	return NEW_LIT(INT2FIX(p->tokline), loc);
       case keyword__ENCODING__:
         node = NEW_LIT(rb_enc_from_encoding(p->enc), loc);
@@ -12248,14 +12232,6 @@ rb_parser_set_options(VALUE vparser, int print, int loop, int chomp, int split)
     p->do_split = split;
 }
 
-void
-rb_parser_warn_location(VALUE vparser, int warn)
-{
-    struct parser_params *p;
-    TypedData_Get_Struct(vparser, struct parser_params, &parser_data_type, p);
-    p->warn_location = warn;
-}
-
 static NODE *
 parser_append_options(struct parser_params *p, NODE *node)
 {

spec/ruby/core/binding/eval_spec.rb

@@ -23,6 +23,7 @@ describe "Binding#eval" do
     bind2.local_variables.should == []
   end
 
+  ruby_version_is ""..."2.8" do
     it "inherits __LINE__ from the enclosing scope" do
       obj = BindingSpecs::Demo.new(1)
       bind = obj.get_binding
@@ -47,6 +48,34 @@ describe "Binding#eval" do
       bind, line = obj.get_binding_with_send_and_line
       suppress_warning {bind.eval("__LINE__")}.should == line
     end
+  end
+
+  ruby_version_is "2.8" do
+    it "starts with line 1 if single argument is given" do
+      obj = BindingSpecs::Demo.new(1)
+      bind = obj.get_binding
+      bind.eval("__LINE__").should == 1
+    end
+
+    it "preserves __LINE__ across multiple calls to eval" do
+      obj = BindingSpecs::Demo.new(1)
+      bind = obj.get_binding
+      bind.eval("__LINE__").should == 1
+      bind.eval("__LINE__").should == 1
+    end
+
+    it "increments __LINE__ on each line of a multiline eval" do
+      obj = BindingSpecs::Demo.new(1)
+      bind = obj.get_binding
+      bind.eval("#foo\n__LINE__").should == 2
+    end
+
+    it "starts with line 1 if the Binding is created with #send" do
+      obj = BindingSpecs::Demo.new(1)
+      bind, line = obj.get_binding_with_send_and_line
+      bind.eval("__LINE__").should == 1
+    end
+  end
 
   it "starts with a __LINE__ of 1 if a filename is passed" do
     bind = BindingSpecs::Demo.new(1).get_binding
@@ -60,11 +89,21 @@ describe "Binding#eval" do
     bind.eval("#foo\n__LINE__", "(test)", 88).should == 89
   end
 
+  ruby_version_is ""..."2.8" do
     it "inherits __FILE__ from the enclosing scope" do
       obj = BindingSpecs::Demo.new(1)
       bind = obj.get_binding
       suppress_warning {bind.eval("__FILE__")}.should == obj.get_file_of_binding
     end
+  end
+
+  ruby_version_is "2.8" do
+    it "Uses (eval) as __FILE__ if single argument given" do
+      obj = BindingSpecs::Demo.new(1)
+      bind = obj.get_binding
+      bind.eval("__FILE__").should == '(eval)'
+    end
+  end
 
   it "uses the __FILE__ that is passed in" do
     bind = BindingSpecs::Demo.new(1).get_binding

spec/ruby/core/kernel/__dir___spec.rb

@@ -12,9 +12,19 @@ describe "Kernel#__dir__" do
     end
   end
 
+  ruby_version_is ""..."2.7" do
     context "when used in eval with top level binding" do
       it "returns the real name of the directory containing the currently-executing file" do
         eval("__dir__", binding).should == File.realpath(File.dirname(__FILE__))
       end
     end
+  end
+
+  ruby_version_is "2.7" do
+    context "when used in eval with top level binding" do
+      it "returns nil" do
+        eval("__dir__", binding).should == nil
+      end
+    end
+  end
 end

spec/ruby/core/kernel/eval_spec.rb

@@ -159,6 +159,7 @@ describe "Kernel#eval" do
     end
   end
 
+  ruby_version_is ""..."2.8" do
     it "uses the filename of the binding if none is provided" do
       eval("__FILE__").should == "(eval)"
       suppress_warning {eval("__FILE__", binding)}.should == __FILE__
@@ -167,6 +168,19 @@ describe "Kernel#eval" do
       suppress_warning {eval("eval '__FILE__', binding", binding)}.should == __FILE__
       suppress_warning {eval("eval '__FILE__', binding", binding, 'success')}.should == 'success'
     end
+  end
+
+  ruby_version_is "2.8" do
+    it "uses (eval) filename if none is provided" do
+      eval("__FILE__").should == "(eval)"
+      eval("__FILE__", binding).should == "(eval)"
+      eval("__FILE__", binding, "success").should == "success"
+      eval("eval '__FILE__', binding").should == "(eval)"
+      eval("eval '__FILE__', binding", binding).should == "(eval)"
+      eval("eval '__FILE__', binding", binding, 'success').should == '(eval)'
+      eval("eval '__FILE__', binding, 'success'", binding).should == 'success'
+    end
+  end
 
   # Found via Rubinius bug github:#149
   it "does not alter the value of __FILE__ in the binding" do

test/ruby/test_eval.rb

@@ -470,9 +470,12 @@ class TestEval < Test::Unit::TestCase
   end
 
   def test_eval_location_binding
-    assert_warning(/__FILE__ in eval/) do
-      assert_equal(__FILE__, eval("__FILE__", binding))
-    end
+    assert_equal(['(eval)', 1], eval("[__FILE__, __LINE__]", nil))
+    assert_equal(['(eval)', 1], eval("[__FILE__, __LINE__]", binding))
+    assert_equal(['foo', 1], eval("[__FILE__, __LINE__]", nil, 'foo'))
+    assert_equal(['foo', 1], eval("[__FILE__, __LINE__]", binding, 'foo'))
+    assert_equal(['foo', 2], eval("[__FILE__, __LINE__]", nil, 'foo', 2))
+    assert_equal(['foo', 2], eval("[__FILE__, __LINE__]", binding, 'foo', 2))
   end
 
   def test_fstring_instance_eval

test/ruby/test_method.rb

@@ -790,7 +790,7 @@ class TestMethod < Test::Unit::TestCase
     assert_instance_of String, __dir__
     assert_equal(File.dirname(File.realpath(__FILE__)), __dir__)
     bug8436 = '[ruby-core:55123] [Bug #8436]'
-    assert_equal(__dir__, eval("__dir__", binding), bug8436)
+    assert_equal(__dir__, eval("__dir__", binding, *binding.source_location), bug8436)
     bug8662 = '[ruby-core:56099] [Bug #8662]'
     assert_equal("arbitrary", eval("__dir__", binding, "arbitrary/file.rb"), bug8662)
     assert_equal("arbitrary", Object.new.instance_eval("__dir__", "arbitrary/file.rb"), bug8662)

vm_eval.c

@@ -1497,12 +1497,6 @@ eval_make_iseq(VALUE src, VALUE fname, int line, const rb_binding_t *bind,
         if (!NIL_P(fname)) fname = rb_fstring(fname);
 	realpath = fname;
     }
-    else if (bind) {
-	fname = pathobj_path(bind->pathobj);
-	realpath = pathobj_realpath(bind->pathobj);
-	line = bind->first_lineno;
-	rb_parser_warn_location(parser, TRUE);
-    }
     else {
         fname = rb_fstring_lit("(eval)");
     }