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From 19ff1036043ae40ff3d8a2e1a6a793219e1ec378 Mon Sep 17 00:00:00 2001
From: Armin Rigo <arigo@tunes.org>
Date: Tue, 26 May 2020 15:51:56 +0200
Subject: [PATCH] Issue #454
Try harder to avoid #line directives confuse the rest of pre-parsing
---
cffi/cparser.py | 37 ++++++++++++++++++++++++---
testing/cffi0/test_parsing.py | 48 ++++++++++++++++++++++++++++++++++-
2 files changed, 81 insertions(+), 4 deletions(-)
diff --git a/cffi/cparser.py b/cffi/cparser.py
index d7069a73..d9784655 100644
--- a/cffi/cparser.py
+++ b/cffi/cparser.py
@@ -29,6 +29,7 @@ _r_comment = re.compile(r"/\*.*?\*/|//([^\n\\]|\\.)*?$",
_r_define = re.compile(r"^\s*#\s*define\s+([A-Za-z_][A-Za-z_0-9]*)"
r"\b((?:[^\n\\]|\\.)*?)$",
re.DOTALL | re.MULTILINE)
+_r_line_directive = re.compile(r"^[ \t]*#[ \t]*line\b.*$", re.MULTILINE)
_r_partial_enum = re.compile(r"=\s*\.\.\.\s*[,}]|\.\.\.\s*\}")
_r_enum_dotdotdot = re.compile(r"__dotdotdot\d+__$")
_r_partial_array = re.compile(r"\[\s*\.\.\.\s*\]")
@@ -163,10 +164,37 @@ def _warn_for_non_extern_non_static_global_variable(decl):
"with C it should have a storage class specifier "
"(usually 'extern')" % (decl.name,))
+def _remove_line_directives(csource):
+ # _r_line_directive matches whole lines, without the final \n, if they
+ # start with '#line' with some spacing allowed. This function stores
+ # them away and replaces them with exactly the string '#line@N', where
+ # N is the index in the list 'line_directives'.
+ line_directives = []
+ def replace(m):
+ i = len(line_directives)
+ line_directives.append(m.group())
+ return '#line@%d' % i
+ csource = _r_line_directive.sub(replace, csource)
+ return csource, line_directives
+
+def _put_back_line_directives(csource, line_directives):
+ def replace(m):
+ s = m.group()
+ if not s.startswith('#line@'):
+ raise AssertionError("unexpected #line directive "
+ "(should have been processed and removed")
+ return line_directives[int(s[6:])]
+ return _r_line_directive.sub(replace, csource)
+
def _preprocess(csource):
+ # First, remove the lines of the form '#line N "filename"' because
+ # the "filename" part could confuse the rest
+ csource, line_directives = _remove_line_directives(csource)
# Remove comments. NOTE: this only work because the cdef() section
- # should not contain any string literal!
- csource = _r_comment.sub(' ', csource)
+ # should not contain any string literals (except in line directives)!
+ def replace_keeping_newlines(m):
+ return ' ' + m.group().count('\n') * '\n'
+ csource = _r_comment.sub(replace_keeping_newlines, csource)
# Remove the "#define FOO x" lines
macros = {}
for match in _r_define.finditer(csource):
@@ -219,7 +247,10 @@ def _preprocess(csource):
csource = _r_float_dotdotdot.sub(' __dotdotdotfloat__ ', csource)
# Replace all remaining "..." with the same name, "__dotdotdot__",
# which is declared with a typedef for the purpose of C parsing.
- return csource.replace('...', ' __dotdotdot__ '), macros
+ csource = csource.replace('...', ' __dotdotdot__ ')
+ # Finally, put back the line directives
+ csource = _put_back_line_directives(csource, line_directives)
+ return csource, macros
def _common_type_names(csource):
# Look in the source for what looks like usages of types from the
diff --git a/testing/cffi0/test_parsing.py b/testing/cffi0/test_parsing.py
index 3fc3783a..5f2d7ec4 100644
--- a/testing/cffi0/test_parsing.py
+++ b/testing/cffi0/test_parsing.py
@@ -174,7 +174,7 @@ def test_remove_line_continuation_comments():
double // blah \\
more comments
x(void);
- double // blah\\\\
+ double // blah // blah\\\\
y(void);
double // blah\\ \
etc
@@ -185,6 +185,52 @@ def test_remove_line_continuation_comments():
m.y
m.z
+def test_dont_remove_comment_in_line_directives():
+ ffi = FFI(backend=FakeBackend())
+ e = py.test.raises(CDefError, ffi.cdef, """
+ \t # \t line \t 8 \t "baz.c" \t
+
+ some syntax error here
+ """)
+ assert str(e.value) == "parse error\nbaz.c:9:14: before: syntax"
+ #
+ e = py.test.raises(CDefError, ffi.cdef, """
+ #line 7 "foo//bar.c"
+
+ some syntax error here
+ """)
+ assert str(e.value) == "parse error\nfoo//bar.c:8:14: before: syntax"
+
+def test_multiple_line_directives():
+ ffi = FFI(backend=FakeBackend())
+ e = py.test.raises(CDefError, ffi.cdef,
+ """ #line 5 "foo.c"
+ extern int xx;
+ #line 6 "bar.c"
+ extern int yy;
+ #line 7 "baz.c"
+ some syntax error here
+ #line 8 "yadda.c"
+ extern int zz;
+ """)
+ assert str(e.value) == "parse error\nbaz.c:7:14: before: syntax"
+
+def test_commented_line_directive():
+ ffi = FFI(backend=FakeBackend())
+ e = py.test.raises(CDefError, ffi.cdef, """
+ /*
+ #line 5 "foo.c"
+ */
+ void xx(void);
+
+ #line 6 "bar.c"
+ /*
+ #line 35 "foo.c"
+ */
+ some syntax error
+ """)
+ assert str(e.value) == "parse error\nbar.c:9:14: before: syntax"
+
def test_line_continuation_in_defines():
ffi = FFI(backend=FakeBackend())
ffi.cdef("""
--
2.26.2
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