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[breaking] Ensure matching line numbers after preprocessing

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Unmatched documentation comments are not just a string, but also contain the line number as well.
This commit is contained in:
Jonathan Müller 2017-10-10 17:07:41 +02:00
commit 7c30ba7c46
4 changed files with 91 additions and 17 deletions
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39
src/libclang/preprocessor.cpp
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@ -191,6 +191,16 @@ namespace
{
}
void undo_write()
{
if (write_ == true && !result_->empty())
{
if (result_->back() == '\n')
--cur_line_;
result_->pop_back();
}
}
void write_str(std::string str)
{
if (write_ == false)
@ -363,7 +373,7 @@ namespace
break;
}
}
p.skip();
skip(p, "\n");
return result;
}
@ -734,16 +744,32 @@ detail::preprocessor_output detail::preprocess(const libclang_compile_config& co
switch (lm.value().flag)
{
case linemarker::line_directive:
break; // ignore
// no need to handle it, preprocessed output doesn't need to match line numbers precisely
if (file_depth == 0u && lm.value().line > p.cur_line())
{
// write the necessary newlines
p.write_str(std::string(lm.value().line - p.cur_line(), '\n'));
DEBUG_ASSERT(p.cur_line() == lm.value().line, detail::assert_handler{});
}
else if (file_depth == 0u)
// current line may be one higher than the expected line,
// because the include directives inserted by -dI have an additional newline
// that is not yet removed
DEBUG_ASSERT(p.cur_line() - lm.value().line <= 1u, detail::assert_handler{});
break;
case linemarker::enter_new:
if (file_depth == 0u && lm.value().file.front() != '<')
{
// this file is directly included by the given file
// write include with full path
// note: don't build include here, do it when an #include is encountered
// and it is not a fake file like builtin or command line
// remove the trailing newline from the include that brought us here
DEBUG_ASSERT(p.was_newl(), detail::assert_handler{});
p.undo_write();
// and write include with full path
p.write_str("#include \"" + lm.value().file + "\"\n");
// note: don't build include here, do it when an #include is encountered
}
++file_depth;
@ -755,6 +781,9 @@ detail::preprocessor_output detail::preprocess(const libclang_compile_config& co
if (file_depth == 0u)
{
DEBUG_ASSERT(lm.value().file == path, detail::assert_handler{});
// difference is 1 if coming from an included file (because newline of include is already written)
// difference is 0 if coming from a builtin file (because no include has been written)
DEBUG_ASSERT(p.cur_line() - lm.value().line <= 1u, detail::assert_handler{});
p.enable_write();
}
break;