parse/ast: fix line number for anonymous function

Fixed:
- Define an error anonymous function in base.bbclass:
  15
  16 python() {
  17     Compile error
  18 }

  $ bitbake -p
  ERROR: Error in compiling python function in /buildarea1/lyang1/poky/meta/classes/base.bbclass, line 18:

  The code lines resulting in this error were:
       0001:def __anon_18__buildarea1_lyang1_poky_meta_classes_base_bbclass(d):
   *** 0002:    Compile error
       0003:
  SyntaxError: invalid syntax (base.bbclass, line 18)

  The lineno should be 17, but it reported 18, this would mislead people a lot
  when there more lines.

- Now fix it to:
  ERROR: Error in compiling python function in /buildarea1/lyang1/poky/meta/classes/base.bbclass, line 17:

  The code lines resulting in this error were:
       0001:def __anon_18__buildarea1_lyang1_poky_meta_classes_base_bbclass(d):
   *** 0002:    Compile error
       0003:
  SyntaxError: invalid syntax (base.bbclass, line 17)

This is because the anonymous function is constructed by:
text = "def %s(d):\n" % (funcname) + text

The len(self.body) doesn't include the "def " line, the length of the function
should be "len(self.body) + 1", so we need pass "self.lineno - (len(self.body) + 1)"
which is the same as 'self.lineno - len(self.body) - 1' to
bb.methodpool.insert_method() as we already had done to named function. Otherwise, the
lineno is wrong, and would cause other problems such as report which line is
wrong, but the line is not what we want since it reports incorrect line.

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/bb/parse/ast.py b/lib/bb/parse/ast.py
index 9d20c323f..6d7c80b34 100644
--- a/lib/bb/parse/ast.py
+++ b/lib/bb/parse/ast.py
@@ -178,7 +178,7 @@ class MethodNode(AstNode):
             funcname = ("__anon_%s_%s" % (self.lineno, self.filename.translate(MethodNode.tr_tbl)))
             self.python = True
             text = "def %s(d):\n" % (funcname) + text
-            bb.methodpool.insert_method(funcname, text, self.filename, self.lineno - len(self.body))
+            bb.methodpool.insert_method(funcname, text, self.filename, self.lineno - len(self.body) - 1)
             anonfuncs = data.getVar('__BBANONFUNCS', False) or []
             anonfuncs.append(funcname)
             data.setVar('__BBANONFUNCS', anonfuncs)