LANGUAGES revision 1.1.1.1.8.2
1 1.1.1.1.8.2 tls Right now there is no documentation for the GCC tree -> rtl interfaces 2 1.1.1.1.8.2 tls (or more generally the interfaces for adding new languages). 3 1.1.1.1.8.2 tls 4 1.1.1.1.8.2 tls Such documentation would be of great benefit to the project. Until such 5 1.1.1.1.8.2 tls time as we can formally start documenting the interface this file will 6 1.1.1.1.8.2 tls serve as a repository for information on these interface and any incompatable 7 1.1.1.1.8.2 tls changes we've made. 8 1.1.1.1.8.2 tls 9 1.1.1.1.8.2 tls 2004-09-09: 10 1.1.1.1.8.2 tls In an effort to decrease execution time, single char tree code 11 1.1.1.1.8.2 tls classes were changed to enumerated values. 12 1.1.1.1.8.2 tls 13 1.1.1.1.8.2 tls Old way: 14 1.1.1.1.8.2 tls 15 1.1.1.1.8.2 tls DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", 'd', 0) 16 1.1.1.1.8.2 tls 17 1.1.1.1.8.2 tls New way: 18 1.1.1.1.8.2 tls 19 1.1.1.1.8.2 tls DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", tcc_declaration, 0) 20 1.1.1.1.8.2 tls 21 1.1.1.1.8.2 tls 2001-02-26: 22 1.1.1.1.8.2 tls A DECL_INITIAL of NULL_TREE or error_mark_node in a VAR_DECL is no longer 23 1.1.1.1.8.2 tls taken to signify a tentative definition which should not be emitted until 24 1.1.1.1.8.2 tls end-of-file. Frontends which want that behavior should set 25 1.1.1.1.8.2 tls DECL_DEFER_OUTPUT before calling rest_of_decl_compilation. 26 1.1.1.1.8.2 tls 27 1.1.1.1.8.2 tls Feb 1, 1998: 28 1.1.1.1.8.2 tls 29 1.1.1.1.8.2 tls GCC used to store structure sizes & offsets to elements as bitsize 30 1.1.1.1.8.2 tls quantities. This causes problems because a structure can only be 31 1.1.1.1.8.2 tls (target memsize / 8) bytes long (this may effect arrays too). This 32 1.1.1.1.8.2 tls is particularly problematical on machines with small address spaces. 33 1.1.1.1.8.2 tls 34 1.1.1.1.8.2 tls So: 35 1.1.1.1.8.2 tls 36 1.1.1.1.8.2 tls All trees that represent sizes in bits should have a TREE_TYPE of 37 1.1.1.1.8.2 tls bitsizetype (rather than sizetype). 38 1.1.1.1.8.2 tls 39 1.1.1.1.8.2 tls Accordingly, when such values are computed / initialized, care has to 40 1.1.1.1.8.2 tls be takes to use / compute the proper type. 41 1.1.1.1.8.2 tls 42 1.1.1.1.8.2 tls When a size in bits is converted into a size in bytes, which is expressed 43 1.1.1.1.8.2 tls in trees, care should be taken to change the tree's type again to sizetype. 44 1.1.1.1.8.2 tls 45 1.1.1.1.8.2 tls ?? 1997: 46 1.1.1.1.8.2 tls 47 1.1.1.1.8.2 tls In an effort to decrease cache thrashing and useless loads we've changed the 48 1.1.1.1.8.2 tls third argument to the DEFTREECODE macro to be a single char. This will 49 1.1.1.1.8.2 tls affect languages that defined their own tree codes (usually in a .def file). 50 1.1.1.1.8.2 tls 51 1.1.1.1.8.2 tls Old way: 52 1.1.1.1.8.2 tls 53 1.1.1.1.8.2 tls DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", "d", 0) 54 1.1.1.1.8.2 tls 55 1.1.1.1.8.2 tls New way: 56 1.1.1.1.8.2 tls 57 1.1.1.1.8.2 tls DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", 'd', 0) 58 1.1.1.1.8.2 tls 59 1.1.1.1.8.2 tls 61 1.1.1.1.8.2 tls Copyright (C) 1998, 2001, 2002, 2004 Free Software Foundation, Inc. 62 1.1.1.1.8.2 tls 63 1.1.1.1.8.2 tls Copying and distribution of this file, with or without modification, 64 1.1.1.1.8.2 tls are permitted in any medium without royalty provided the copyright 65 notice and this notice are preserved. 66
Indexes created Tue Aug 11 00:25:38 UTC 2026