The way I've heard of is to write an extremely limited compiler in another language, then use that to compile a more complicated version, written in the new language. This second version can then be used to compile itself, and the next version. Each time it is compiled the last version is used.
The second pattern is aimed at the C compiler. The replacement code is a Stage I self-reproducing program that inserts both Trojan horses into the compiler. This requires a learning phase as in the Stage II example. First we compile the modified source with the normal C compiler to produce a bugged binary. We install this binary as the official C. We can now remove the bugs from the source of the compiler and the new binary will reinsert the bugs whenever it is compiled. Of course, the login command will remain bugged with no trace in source anywhere.
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:Dragon Book: n. The classic text "Compilers:Principles, Techniques and Tools", by Alfred V. Aho, Ravi Sethi,and Jeffrey D. Ullman (Addison-Wesley 1986; ISBN 0-201-10088-6),so called because of the cover design featuring a dragon labeled'complexity of compiler design' and a knight bearing the lance'LALR parser generator' among his other trappings. This one ismore specifically known as the 'Red Dragon Book' (1986); an earlieredition, sans Sethi and titled "Principles Of Compiler Design"(Alfred V. Aho and Jeffrey D. Ullman; Addison-Wesley, 1977; ISBN0-201-00022-9), was the 'Green Dragon Book' (1977). (Also 'NewDragon Book', ;Old Dragon Book'.) The horsed knight and theGreen Dragon were warily eying each other at a distance; now theknight is typing (wearing gauntlets!) at a terminal showing avideo-game representation of the Red Dragon's head while the restof the beast extends back in normal space. See also {{booktitles}}.
Yes, having it backed into the compiler is often preferred. As you say, macros work today and allow to explore possible solutions already. Even a half-backed solution now is certainly better than none.
A good solution might eventually make it into the compiler. Imho, the main advantage is that it becomes a language wide standard then and can be more deeply integrated, it might not be better in all respects and harder to change though (there have been some discussion around the iteration interface that for expands into). Even languages without macros evolve syntax-wise, it just takes much longer (Java took years to get for-each loops and lambdas eventually). be457b7860
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