Mercurial > hg > CbC > CbC_gcc
annotate gcc/LANGUAGES @ 116:367f9f4f266e
fix gimple.h
| author | mir3636 |
|---|---|
| date | Tue, 28 Nov 2017 20:22:01 +0900 |
| parents | 04ced10e8804 |
| children | 84e7813d76e9 |
| rev | line source |
|---|---|
| 0 | 1 Right now there is no documentation for the GCC tree -> rtl interfaces |
| 2 (or more generally the interfaces for adding new languages). | |
| 3 | |
| 4 Such documentation would be of great benefit to the project. Until such | |
| 5 time as we can formally start documenting the interface this file will | |
| 111 | 6 serve as a repository for information on these interface and any incompatible |
| 0 | 7 changes we've made. |
| 8 | |
| 9 2004-09-09: | |
| 10 In an effort to decrease execution time, single char tree code | |
| 11 classes were changed to enumerated values. | |
| 12 | |
| 13 Old way: | |
| 14 | |
| 15 DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", 'd', 0) | |
| 16 | |
| 17 New way: | |
| 18 | |
| 19 DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", tcc_declaration, 0) | |
| 20 | |
| 21 2001-02-26: | |
| 22 A DECL_INITIAL of NULL_TREE or error_mark_node in a VAR_DECL is no longer | |
| 23 taken to signify a tentative definition which should not be emitted until | |
| 24 end-of-file. Frontends which want that behavior should set | |
| 25 DECL_DEFER_OUTPUT before calling rest_of_decl_compilation. | |
| 26 | |
| 27 Feb 1, 1998: | |
| 28 | |
| 29 GCC used to store structure sizes & offsets to elements as bitsize | |
| 30 quantities. This causes problems because a structure can only be | |
| 31 (target memsize / 8) bytes long (this may effect arrays too). This | |
| 32 is particularly problematical on machines with small address spaces. | |
| 33 | |
| 34 So: | |
| 35 | |
| 36 All trees that represent sizes in bits should have a TREE_TYPE of | |
| 37 bitsizetype (rather than sizetype). | |
| 38 | |
| 39 Accordingly, when such values are computed / initialized, care has to | |
| 40 be takes to use / compute the proper type. | |
| 41 | |
| 42 When a size in bits is converted into a size in bytes, which is expressed | |
| 43 in trees, care should be taken to change the tree's type again to sizetype. | |
| 44 | |
| 45 ?? 1997: | |
| 46 | |
| 47 In an effort to decrease cache thrashing and useless loads we've changed the | |
| 48 third argument to the DEFTREECODE macro to be a single char. This will | |
| 49 affect languages that defined their own tree codes (usually in a .def file). | |
| 50 | |
| 51 Old way: | |
| 52 | |
| 53 DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", "d", 0) | |
| 54 | |
| 55 New way: | |
| 56 | |
| 57 DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", 'd', 0) | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
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58 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
59 |
| 111 | 60 Copyright (C) 1998-2017 Free Software Foundation, Inc. |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
61 |
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77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
62 Copying and distribution of this file, with or without modification, |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
63 are permitted in any medium without royalty provided the copyright |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
64 notice and this notice are preserved. |