From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- gcc/LANGUAGES | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 gcc/LANGUAGES (limited to 'gcc/LANGUAGES') diff --git a/gcc/LANGUAGES b/gcc/LANGUAGES new file mode 100644 index 000000000..805e9b49c --- /dev/null +++ b/gcc/LANGUAGES @@ -0,0 +1,64 @@ +Right now there is no documentation for the GCC tree -> rtl interfaces +(or more generally the interfaces for adding new languages). + +Such documentation would be of great benefit to the project. Until such +time as we can formally start documenting the interface this file will +serve as a repository for information on these interface and any incompatable +changes we've made. + +2004-09-09: + In an effort to decrease execution time, single char tree code + classes were changed to enumerated values. + + Old way: + + DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", 'd', 0) + + New way: + + DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", tcc_declaration, 0) + +2001-02-26: + A DECL_INITIAL of NULL_TREE or error_mark_node in a VAR_DECL is no longer + taken to signify a tentative definition which should not be emitted until + end-of-file. Frontends which want that behavior should set + DECL_DEFER_OUTPUT before calling rest_of_decl_compilation. + +Feb 1, 1998: + + GCC used to store structure sizes & offsets to elements as bitsize + quantities. This causes problems because a structure can only be + (target memsize / 8) bytes long (this may effect arrays too). This + is particularly problematical on machines with small address spaces. + + So: + + All trees that represent sizes in bits should have a TREE_TYPE of + bitsizetype (rather than sizetype). + + Accordingly, when such values are computed / initialized, care has to + be takes to use / compute the proper type. + + When a size in bits is converted into a size in bytes, which is expressed + in trees, care should be taken to change the tree's type again to sizetype. + +?? 1997: + + In an effort to decrease cache thrashing and useless loads we've changed the + third argument to the DEFTREECODE macro to be a single char. This will + affect languages that defined their own tree codes (usually in a .def file). + + Old way: + + DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", "d", 0) + + New way: + + DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", 'd', 0) + + +Copyright (C) 1998, 2001, 2002, 2004 Free Software Foundation, Inc. + +Copying and distribution of this file, with or without modification, +are permitted in any medium without royalty provided the copyright +notice and this notice are preserved. -- cgit v1.2.3