GCC 和 Clang 解析器真的是手写的吗? [英] Are GCC and Clang parsers really handwritten?

问题描述

似乎 GCC 和 LLVM-Clang 正在使用手写递归下降解析器，并且不是机器生成的、基于 Bison-Flex 的自底向上解析.

It seems that GCC and LLVM-Clang are using handwritten recursive descent parsers, and not machine generated, Bison-Flex based, bottom up parsing.

这里有人可以确认是这样吗?如果是这样，为什么主流编译器框架使用手写解析器?

Could someone here please confirm that this is the case? And if so, why do mainstream compiler frameworks use handwritten parsers?

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推荐答案

是:

• GCC 曾经使用过一个 yacc(bison)解析器，但在 3.x 系列的某个时候它被一个手写的递归下降解析器所取代:见 http://gcc.gnu.org/wiki/New_C_Parser 提供相关补丁提交的链接.

• GCC used a yacc (bison) parser once upon a time, but it was replaced with a hand-written recursive descent parser at some point in the 3.x series: see http://gcc.gnu.org/wiki/New_C_Parser for links to relevant patch submissions.

Clang 还使用了手写的递归下降解析器:请参阅 http://clang.llvm.org/features.html .

Clang also uses a hand-written recursive descent parser: see the section "A single unified parser for C, Objective C, C++ and Objective C++" near the end of http://clang.llvm.org/features.html .

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