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annotate gcc/doc/languages.texi @ 158:494b0b89df80 default tip
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| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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| date | Mon, 25 May 2020 18:13:55 +0900 |
| parents | 1830386684a0 |
| children |
| rev | line source |
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| 145 | 1 @c Copyright (C) 2002-2020 Free Software Foundation, Inc. |
| 0 | 2 @c This is part of the GCC manual. |
| 3 @c For copying conditions, see the file gcc.texi. | |
| 4 | |
| 5 @node Languages | |
| 6 @chapter Language Front Ends in GCC | |
| 7 | |
| 8 The interface to front ends for languages in GCC, and in particular | |
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update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
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9 the @code{tree} structure (@pxref{GENERIC}), was initially designed for |
| 0 | 10 C, and many aspects of it are still somewhat biased towards C and |
| 11 C-like languages. It is, however, reasonably well suited to other | |
| 12 procedural languages, and front ends for many such languages have been | |
| 13 written for GCC@. | |
| 14 | |
| 15 Writing a compiler as a front end for GCC, rather than compiling | |
| 16 directly to assembler or generating C code which is then compiled by | |
| 17 GCC, has several advantages: | |
| 18 | |
| 19 @itemize @bullet | |
| 20 @item GCC front ends benefit from the support for many different | |
| 21 target machines already present in GCC@. | |
| 22 @item GCC front ends benefit from all the optimizations in GCC@. Some | |
| 23 of these, such as alias analysis, may work better when GCC is | |
| 24 compiling directly from source code then when it is compiling from | |
| 25 generated C code. | |
| 26 @item Better debugging information is generated when compiling | |
| 27 directly from source code than when going via intermediate generated C | |
| 28 code. | |
| 29 @end itemize | |
| 30 | |
| 31 Because of the advantages of writing a compiler as a GCC front end, | |
| 32 GCC front ends have also been created for languages very different | |
| 33 from those for which GCC was designed, such as the declarative | |
| 34 logic/functional language Mercury. For these reasons, it may also be | |
| 35 useful to implement compilers created for specialized purposes (for | |
| 36 example, as part of a research project) as GCC front ends. |