652 lines
25 KiB
C++
652 lines
25 KiB
C++
// Copyright (C) 2017 Jonathan Müller <jonathanmueller.dev@gmail.com>
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// This file is subject to the license terms in the LICENSE file
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// found in the top-level directory of this distribution.
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#include <cppast/cpp_function.hpp>
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#include <cppast/cpp_member_function.hpp>
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#include "libclang_visitor.hpp"
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#include "parse_functions.hpp"
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using namespace cppast;
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namespace
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{
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std::unique_ptr<cpp_function_parameter> parse_parameter(const detail::parse_context& context,
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const CXCursor& cur)
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{
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auto name = detail::get_cursor_name(cur);
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auto type = detail::parse_type(context, cur, clang_getCursorType(cur));
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auto default_value = detail::parse_default_value(context, cur, name.c_str());
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if (name.empty())
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return cpp_function_parameter::build(std::move(type), std::move(default_value));
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else
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return cpp_function_parameter::build(*context.idx, detail::get_entity_id(cur),
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name.c_str(), std::move(type),
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std::move(default_value));
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}
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template <class Builder>
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void add_parameters(const detail::parse_context& context, Builder& builder, const CXCursor& cur)
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{
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if (clang_getCursorKind(cur) == CXCursor_FunctionTemplate)
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{
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// clang_Cursor_getNumArguments() doesn't work here
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// (of course it doesn't...)
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detail::visit_children(cur, [&](const CXCursor& child) {
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if (clang_getCursorKind(child) != CXCursor_ParmDecl)
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return;
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try
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{
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auto parameter = parse_parameter(context, child);
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builder.add_parameter(std::move(parameter));
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}
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catch (detail::parse_error& ex)
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{
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context.logger->log("libclang parser", ex.get_diagnostic());
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}
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});
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}
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else
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{
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auto no = clang_Cursor_getNumArguments(cur);
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DEBUG_ASSERT(no != -1, detail::parse_error_handler{}, cur,
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"unexpected number of arguments");
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for (auto i = 0; i != no; ++i)
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try
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{
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auto parameter = parse_parameter(context, clang_Cursor_getArgument(cur, i));
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builder.add_parameter(std::move(parameter));
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}
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catch (detail::parse_error& ex)
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{
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context.logger->log("libclang parser", ex.get_diagnostic());
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}
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}
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}
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bool is_templated_cursor(const CXCursor& cur)
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{
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return clang_getTemplateCursorKind(cur) != CXCursor_NoDeclFound
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|| !clang_Cursor_isNull(clang_getSpecializedCursorTemplate(cur));
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}
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// precondition: after the name
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void skip_parameters(detail::token_stream& stream)
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{
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if (stream.peek() == "<")
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// specialization arguments
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detail::skip_brackets(stream);
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detail::skip_brackets(stream);
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}
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// just the tokens occurring in the prefix
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struct prefix_info
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{
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std::string scope_name;
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bool is_constexpr = false;
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bool is_virtual = false;
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bool is_explicit = false;
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};
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bool prefix_end(detail::token_stream& stream, const char* name)
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{
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auto cur = stream.cur();
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// name can have multiple tokens if it is an operator
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if (!detail::skip_if(stream, name, true))
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return false;
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else if (stream.peek() == "::")
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{
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// was a class name of constructor
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stream.set_cur(cur);
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return false;
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}
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else
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return true;
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}
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prefix_info parse_prefix_info(detail::token_stream& stream, const char* name)
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{
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prefix_info result;
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std::string scope;
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while (!stream.done() && !prefix_end(stream, name))
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{
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if (detail::skip_if(stream, "constexpr"))
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{
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result.is_constexpr = true;
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scope.clear();
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}
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else if (detail::skip_if(stream, "virtual"))
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{
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result.is_virtual = true;
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scope.clear();
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}
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else if (detail::skip_if(stream, "explicit"))
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{
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result.is_explicit = true;
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scope.clear();
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}
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// add identifiers and "::" to current scope name,
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// clear if there is any other token in between, or mismatched combination
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else if (stream.peek().kind() == CXToken_Identifier)
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{
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if (!scope.empty() && scope.back() != ':')
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scope.clear();
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scope += stream.get().c_str();
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}
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else if (stream.peek() == "::")
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{
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if (!scope.empty() && scope.back() == ':')
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scope.clear();
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scope += stream.get().c_str();
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}
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else if (stream.peek() == "<")
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{
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auto iter = detail::find_closing_bracket(stream);
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scope += detail::to_string(stream, iter);
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if (!detail::skip_if(stream, ">>"))
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detail::skip(stream, ">");
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scope += ">";
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}
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else
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{
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stream.bump();
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scope.clear();
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}
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}
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DEBUG_ASSERT(!stream.done(), detail::parse_error_handler{}, stream.cursor(),
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"unable to find end of function prefix");
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if (!scope.empty() && scope.back() == ':')
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result.scope_name = std::move(scope);
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return result;
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}
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// just the tokens occurring in the suffix
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struct suffix_info
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{
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std::unique_ptr<cpp_expression> noexcept_condition;
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cpp_function_body_kind body_kind;
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cpp_cv cv_qualifier = cpp_cv_none;
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cpp_reference ref_qualifier = cpp_ref_none;
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cpp_virtual virtual_keywords;
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suffix_info(const CXCursor& cur)
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: body_kind(clang_isCursorDefinition(cur) ? cpp_function_definition :
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cpp_function_declaration)
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{
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}
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};
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cpp_cv parse_cv(detail::token_stream& stream)
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{
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if (detail::skip_if(stream, "const"))
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{
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if (detail::skip_if(stream, "volatile"))
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return cpp_cv_const_volatile;
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else
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return cpp_cv_const;
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}
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else if (detail::skip_if(stream, "volatile"))
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{
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if (detail::skip_if(stream, "const"))
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return cpp_cv_const_volatile;
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else
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return cpp_cv_volatile;
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}
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else
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return cpp_cv_none;
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}
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cpp_reference parse_ref(detail::token_stream& stream)
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{
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if (detail::skip_if(stream, "&"))
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return cpp_ref_lvalue;
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else if (detail::skip_if(stream, "&&"))
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return cpp_ref_rvalue;
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else
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return cpp_ref_none;
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}
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std::unique_ptr<cpp_expression> parse_noexcept(detail::token_stream& stream,
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const detail::parse_context& context)
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{
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if (!detail::skip_if(stream, "noexcept"))
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return nullptr;
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auto type = cpp_builtin_type::build(cpp_bool);
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if (stream.peek().value() != "(")
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return cpp_literal_expression::build(std::move(type), "true");
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auto closing = detail::find_closing_bracket(stream);
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detail::skip(stream, "(");
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auto expr = detail::parse_raw_expression(context, stream, closing, std::move(type));
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detail::skip(stream, ")");
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return expr;
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}
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cpp_function_body_kind parse_body_kind(detail::token_stream& stream, bool& pure_virtual)
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{
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pure_virtual = false;
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if (detail::skip_if(stream, "default"))
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return cpp_function_defaulted;
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else if (detail::skip_if(stream, "delete"))
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return cpp_function_deleted;
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else if (detail::skip_if(stream, "0"))
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{
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pure_virtual = true;
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return cpp_function_declaration;
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}
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DEBUG_UNREACHABLE(detail::parse_error_handler{}, stream.cursor(),
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"unexpected token for function body kind");
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return cpp_function_declaration;
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}
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void parse_body(detail::token_stream& stream, suffix_info& result, bool allow_virtual)
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{
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auto pure_virtual = false;
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result.body_kind = parse_body_kind(stream, pure_virtual);
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if (pure_virtual)
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{
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DEBUG_ASSERT(allow_virtual, detail::parse_error_handler{}, stream.cursor(),
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"unexpected token");
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if (result.virtual_keywords)
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result.virtual_keywords.value() |= cpp_virtual_flags::pure;
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else
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result.virtual_keywords = cpp_virtual_flags::pure;
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}
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}
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// precondition: we've skipped the function parameters
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suffix_info parse_suffix_info(detail::token_stream& stream,
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const detail::parse_context& context, bool allow_qualifier,
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bool allow_virtual)
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{
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suffix_info result(stream.cursor());
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// syntax: <attribute> <cv> <ref> <exception>
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detail::skip_attribute(stream);
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if (allow_qualifier)
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{
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result.cv_qualifier = parse_cv(stream);
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result.ref_qualifier = parse_ref(stream);
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}
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if (detail::skip_if(stream, "throw"))
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// just because I can
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detail::skip_brackets(stream);
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result.noexcept_condition = parse_noexcept(stream, context);
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// check if we have leftovers of the return type
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// i.e.: `void (*foo(int a, int b) const)(int)`;
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// ^^^^^^- attributes
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// ^^^^^^- leftovers
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// if we have a closing parenthesis, skip brackets
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if (detail::skip_if(stream, ")"))
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detail::skip_brackets(stream);
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// check for trailing return type
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if (detail::skip_if(stream, "->"))
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{
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//detail::print_tokens(context.tu, context.file, stream.cursor());
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// this is rather tricky to skip
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// so loop over all tokens and see if matching keytokens occur
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// note that this isn't quite correct
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// use a heuristic to skip brackets, which should be good enough
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while (!stream.done())
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{
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if (stream.peek() == "(" || stream.peek() == "[" || stream.peek() == "<")
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detail::skip_brackets(stream);
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else if (stream.peek() == "{")
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// begin of definition
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break;
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else if (detail::skip_if(stream, "override"))
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{
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DEBUG_ASSERT(allow_virtual, detail::parse_error_handler{}, stream.cursor(),
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"unexpected token");
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if (result.virtual_keywords)
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result.virtual_keywords.value() |= cpp_virtual_flags::override;
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else
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result.virtual_keywords = cpp_virtual_flags::override;
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}
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else if (detail::skip_if(stream, "final"))
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{
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DEBUG_ASSERT(allow_virtual, detail::parse_error_handler{}, stream.cursor(),
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"unexpected token");
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if (result.virtual_keywords)
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result.virtual_keywords.value() |= cpp_virtual_flags::final;
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else
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result.virtual_keywords = cpp_virtual_flags::final;
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}
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else if (detail::skip_if(stream, "="))
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parse_body(stream, result, allow_virtual);
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else
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stream.bump();
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}
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}
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else
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{
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// syntax: <virtuals> <body>
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if (detail::skip_if(stream, "override"))
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{
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DEBUG_ASSERT(allow_virtual, detail::parse_error_handler{}, stream.cursor(),
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"unexpected token");
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result.virtual_keywords = cpp_virtual_flags::override;
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if (detail::skip_if(stream, "final"))
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result.virtual_keywords.value() |= cpp_virtual_flags::final;
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}
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else if (detail::skip_if(stream, "final"))
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{
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DEBUG_ASSERT(allow_virtual, detail::parse_error_handler{}, stream.cursor(),
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"unexpected token");
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result.virtual_keywords = cpp_virtual_flags::final;
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if (detail::skip_if(stream, "override"))
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result.virtual_keywords.value() |= cpp_virtual_flags::override;
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}
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if (detail::skip_if(stream, "="))
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parse_body(stream, result, allow_virtual);
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}
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return result;
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}
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std::unique_ptr<cpp_entity> parse_cpp_function_impl(const detail::parse_context& context,
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const CXCursor& cur, bool is_static)
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{
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auto name = detail::get_cursor_name(cur);
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detail::tokenizer tokenizer(context.tu, context.file, cur);
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detail::token_stream stream(tokenizer, cur);
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auto prefix = parse_prefix_info(stream, name.c_str());
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DEBUG_ASSERT(!prefix.is_virtual && !prefix.is_explicit, detail::parse_error_handler{}, cur,
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"free function cannot be virtual or explicit");
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cpp_function::builder builder(prefix.scope_name + name.c_str(),
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detail::parse_type(context, cur,
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clang_getCursorResultType(cur)));
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context.comments.match(builder.get(), cur);
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add_parameters(context, builder, cur);
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if (clang_Cursor_isVariadic(cur))
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builder.is_variadic();
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builder.storage_class(cpp_storage_class_specifiers(
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detail::get_storage_class(cur)
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| (is_static ? cpp_storage_class_static : cpp_storage_class_none)));
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if (prefix.is_constexpr)
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builder.is_constexpr();
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skip_parameters(stream);
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auto suffix = parse_suffix_info(stream, context, false, false);
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if (suffix.noexcept_condition)
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builder.noexcept_condition(std::move(suffix.noexcept_condition));
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if (is_templated_cursor(cur))
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return builder.finish(detail::get_entity_id(cur), suffix.body_kind);
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else
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return builder.finish(*context.idx, detail::get_entity_id(cur), suffix.body_kind);
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}
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}
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std::unique_ptr<cpp_entity> detail::parse_cpp_function(const detail::parse_context& context,
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const CXCursor& cur)
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{
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DEBUG_ASSERT(clang_getCursorKind(cur) == CXCursor_FunctionDecl
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|| clang_getTemplateCursorKind(cur) == CXCursor_FunctionDecl,
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detail::assert_handler{});
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return parse_cpp_function_impl(context, cur, false);
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}
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std::unique_ptr<cpp_entity> detail::try_parse_static_cpp_function(
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const detail::parse_context& context, const CXCursor& cur)
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{
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DEBUG_ASSERT(clang_getCursorKind(cur) == CXCursor_CXXMethod
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|| clang_getTemplateCursorKind(cur) == CXCursor_CXXMethod,
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detail::assert_handler{});
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if (clang_CXXMethod_isStatic(cur))
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return parse_cpp_function_impl(context, cur, true);
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return nullptr;
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}
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namespace
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{
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bool overrides_function(const CXCursor& cur)
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{
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CXCursor* overrides = nullptr;
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auto num = 0u;
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clang_getOverriddenCursors(cur, &overrides, &num);
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clang_disposeOverriddenCursors(overrides);
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return num != 0u;
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}
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cpp_virtual calculate_virtual(const CXCursor& cur, bool virtual_keyword,
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const cpp_virtual& virtual_suffix)
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{
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if (!clang_CXXMethod_isVirtual(cur))
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{
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// not a virtual function, ensure it wasn't parsed that way
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DEBUG_ASSERT(!virtual_keyword && !virtual_suffix.has_value(),
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detail::parse_error_handler{}, cur, "virtualness not parsed properly");
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return {};
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}
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else if (clang_CXXMethod_isPureVirtual(cur))
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{
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// pure virtual function - all information in the suffix
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DEBUG_ASSERT(virtual_suffix.has_value()
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&& virtual_suffix.value() & cpp_virtual_flags::pure,
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detail::parse_error_handler{}, cur, "pure virtual not detected");
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return virtual_suffix;
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}
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else
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{
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// non-pure virtual function
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DEBUG_ASSERT(!virtual_suffix.has_value()
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|| !(virtual_suffix.value() & cpp_virtual_flags::pure),
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detail::parse_error_handler{}, cur,
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"pure virtual function detected, even though it isn't");
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// calculate whether it overrides
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auto overrides = !virtual_keyword
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|| (virtual_suffix.has_value()
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&& virtual_suffix.value() & cpp_virtual_flags::override)
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|| overrides_function(cur);
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// result are all the flags in the suffix
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auto result = virtual_suffix;
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if (!result)
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// make sure it isn't empty
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result.emplace();
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if (overrides)
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// make sure it contains the override flag
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result.value() |= cpp_virtual_flags::override;
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return result;
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}
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}
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template <class Builder>
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auto set_qualifier(int, Builder& b, cpp_cv cv, cpp_reference ref)
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-> decltype(b.cv_ref_qualifier(cv, ref), true)
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{
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b.cv_ref_qualifier(cv, ref);
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return true;
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}
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template <class Builder>
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bool set_qualifier(short, Builder&, cpp_cv, cpp_reference)
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{
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return false;
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}
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template <class Builder>
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std::unique_ptr<cpp_entity> handle_suffix(const detail::parse_context& context,
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const CXCursor& cur, Builder& builder,
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detail::token_stream& stream, bool is_virtual)
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{
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auto allow_qualifiers = set_qualifier(0, builder, cpp_cv_none, cpp_ref_none);
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auto suffix = parse_suffix_info(stream, context, allow_qualifiers, true);
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set_qualifier(0, builder, suffix.cv_qualifier, suffix.ref_qualifier);
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if (suffix.noexcept_condition)
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builder.noexcept_condition(move(suffix.noexcept_condition));
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if (auto virt = calculate_virtual(cur, is_virtual, suffix.virtual_keywords))
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builder.virtual_info(virt.value());
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if (is_templated_cursor(cur))
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return builder.finish(detail::get_entity_id(cur), suffix.body_kind);
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else
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return builder.finish(*context.idx, detail::get_entity_id(cur), suffix.body_kind);
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}
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}
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std::unique_ptr<cpp_entity> detail::parse_cpp_member_function(const detail::parse_context& context,
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const CXCursor& cur)
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{
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DEBUG_ASSERT(clang_getCursorKind(cur) == CXCursor_CXXMethod
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|| clang_getTemplateCursorKind(cur) == CXCursor_CXXMethod,
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detail::assert_handler{});
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auto name = detail::get_cursor_name(cur);
|
|
|
|
detail::tokenizer tokenizer(context.tu, context.file, cur);
|
|
detail::token_stream stream(tokenizer, cur);
|
|
|
|
auto prefix = parse_prefix_info(stream, name.c_str());
|
|
DEBUG_ASSERT(!prefix.is_explicit, detail::parse_error_handler{}, cur,
|
|
"member function cannot be explicit");
|
|
|
|
cpp_member_function::builder builder(prefix.scope_name + name.c_str(),
|
|
detail::parse_type(context, cur,
|
|
clang_getCursorResultType(cur)));
|
|
context.comments.match(builder.get(), cur);
|
|
add_parameters(context, builder, cur);
|
|
if (clang_Cursor_isVariadic(cur))
|
|
builder.is_variadic();
|
|
|
|
if (prefix.is_constexpr)
|
|
builder.is_constexpr();
|
|
|
|
skip_parameters(stream);
|
|
return handle_suffix(context, cur, builder, stream, prefix.is_virtual);
|
|
}
|
|
|
|
std::unique_ptr<cpp_entity> detail::parse_cpp_conversion_op(const detail::parse_context& context,
|
|
const CXCursor& cur)
|
|
{
|
|
DEBUG_ASSERT(clang_getCursorKind(cur) == CXCursor_ConversionFunction
|
|
|| clang_getTemplateCursorKind(cur) == CXCursor_ConversionFunction,
|
|
detail::assert_handler{});
|
|
|
|
detail::tokenizer tokenizer(context.tu, context.file, cur);
|
|
detail::token_stream stream(tokenizer, cur);
|
|
|
|
auto prefix = parse_prefix_info(stream, "operator");
|
|
// heuristic to find arguments tokens
|
|
// skip forward, skipping inside brackets
|
|
auto type_start = stream.cur();
|
|
while (true)
|
|
{
|
|
if (detail::skip_if(stream, "("))
|
|
{
|
|
if (detail::skip_if(stream, ")"))
|
|
break;
|
|
else
|
|
detail::skip_brackets(stream);
|
|
}
|
|
else if (detail::skip_if(stream, "["))
|
|
detail::skip_brackets(stream);
|
|
else if (detail::skip_if(stream, "{"))
|
|
detail::skip_brackets(stream);
|
|
else if (detail::skip_if(stream, "<"))
|
|
detail::skip_brackets(stream);
|
|
else
|
|
stream.bump();
|
|
}
|
|
// bump arguments back
|
|
stream.bump_back();
|
|
stream.bump_back();
|
|
auto type_end = stream.cur();
|
|
|
|
// read the type
|
|
stream.set_cur(type_start);
|
|
auto type_spelling = detail::to_string(stream, type_end);
|
|
|
|
// parse arguments again
|
|
detail::skip(stream, "(");
|
|
detail::skip(stream, ")");
|
|
|
|
auto type = clang_getCursorResultType(cur);
|
|
cpp_conversion_op::builder builder(prefix.scope_name + "operator " + type_spelling,
|
|
detail::parse_type(context, cur, type));
|
|
context.comments.match(builder.get(), cur);
|
|
if (prefix.is_explicit)
|
|
builder.is_explicit();
|
|
else if (prefix.is_constexpr)
|
|
builder.is_constexpr();
|
|
|
|
return handle_suffix(context, cur, builder, stream, prefix.is_virtual);
|
|
}
|
|
|
|
std::unique_ptr<cpp_entity> detail::parse_cpp_constructor(const detail::parse_context& context,
|
|
const CXCursor& cur)
|
|
{
|
|
DEBUG_ASSERT(clang_getCursorKind(cur) == CXCursor_Constructor
|
|
|| clang_getTemplateCursorKind(cur) == CXCursor_Constructor,
|
|
detail::assert_handler{});
|
|
std::string name = detail::get_cursor_name(cur).c_str();
|
|
auto pos = name.find('<');
|
|
if (pos != std::string::npos)
|
|
name.erase(pos);
|
|
|
|
detail::tokenizer tokenizer(context.tu, context.file, cur);
|
|
detail::token_stream stream(tokenizer, cur);
|
|
|
|
auto prefix = parse_prefix_info(stream, name.c_str());
|
|
DEBUG_ASSERT(!prefix.is_virtual, detail::parse_error_handler{}, cur,
|
|
"constructor cannot be virtual");
|
|
|
|
cpp_constructor::builder builder(prefix.scope_name + name.c_str());
|
|
context.comments.match(builder.get(), cur);
|
|
add_parameters(context, builder, cur);
|
|
if (clang_Cursor_isVariadic(cur))
|
|
builder.is_variadic();
|
|
if (prefix.is_constexpr)
|
|
builder.is_constexpr();
|
|
else if (prefix.is_explicit)
|
|
builder.is_explicit();
|
|
|
|
skip_parameters(stream);
|
|
|
|
auto suffix = parse_suffix_info(stream, context, false, false);
|
|
if (suffix.noexcept_condition)
|
|
builder.noexcept_condition(std::move(suffix.noexcept_condition));
|
|
|
|
if (is_templated_cursor(cur))
|
|
return builder.finish(detail::get_entity_id(cur), suffix.body_kind);
|
|
else
|
|
return builder.finish(*context.idx, detail::get_entity_id(cur), suffix.body_kind);
|
|
}
|
|
|
|
std::unique_ptr<cpp_entity> detail::parse_cpp_destructor(const detail::parse_context& context,
|
|
const CXCursor& cur)
|
|
{
|
|
DEBUG_ASSERT(clang_getCursorKind(cur) == CXCursor_Destructor, detail::assert_handler{});
|
|
|
|
detail::tokenizer tokenizer(context.tu, context.file, cur);
|
|
detail::token_stream stream(tokenizer, cur);
|
|
|
|
auto is_virtual = detail::skip_if(stream, "virtual");
|
|
detail::skip(stream, "~");
|
|
auto name = std::string("~") + stream.get().c_str();
|
|
cpp_destructor::builder builder(std::move(name));
|
|
context.comments.match(builder.get(), cur);
|
|
|
|
detail::skip(stream, "(");
|
|
detail::skip(stream, ")");
|
|
return handle_suffix(context, cur, builder, stream, is_virtual);
|
|
}
|