GCC modified for the FreeChainXenon project
abbfd69841
This patch reimplements the handling of the secondary stack when the
iteration scheme of a loop statement requires this support.
Prior to this modification, an iterator loop over a container was
assumed to require unconditional secondary stack management. This is
however not always true because of user-defined iterator types, where
routines First and Next return an iterator that does require the
secondary stack.
------------
-- Source --
------------
-- gnat.adc
pragma Restrictions (No_Secondary_Stack);
-- test.ads
package Test is
type Test_Type is private
with
Default_Initial_Condition,
Iterable => (First => First_Element,
Next => Next_Element,
Has_Element => Has_Element,
Element => Element);
type Cursor_Type is private;
function First_Element (T : Test_Type) return Cursor_Type;
function Next_Element (T : Test_Type; C : Cursor_Type) return Cursor_Type;
function Has_Element (T : Test_Type; C : Cursor_Type) return Boolean;
function Element (T : Test_Type; C : Cursor_Type) return Natural;
private
type Cursor_Type is new Natural;
type Test_Type is record
null;
end record;
function First_Element (T : Test_Type) return Cursor_Type
is (0);
function Next_Element (T : Test_Type; C : Cursor_Type) return Cursor_Type
is (0);
function Has_Element (T : Test_Type; C : Cursor_Type) return Boolean
is (False);
function Element (T : Test_Type; C : Cursor_Type) return Natural
is (0);
end Test;
-- main.adb
with Test; use Test;
procedure Main is
F : Boolean;
M : Test_Type;
begin
for Elem of M loop
null;
end loop;
F := (for all C of M => C = 1);
F := (for all C in M => True);
end Main;
-----------------
-- Compilation --
-----------------
$ gnatmake -q --RTS=zfp -nostdlib main.adb
2018-09-26 Hristian Kirtchev <kirtchev@adacore.com>
gcc/ada/
* exp_ch4.adb (Expand_N_Allocator): Ensure that the use of the
secondary stack does not clash with restriction
No_Secondary_Stack.
* exp_ch6.adb (Expand_N_Extended_Return_Statement): Ensure that
the use of the secondary stack does not clash with restriction
No_Secondary_Stack.
* sem_ch5.adb (Analyze_Loop_Statement): Wrap the loop in a block
prior to analysis in order to either provide a local scope for
an iterator, or ensure that the secondary stack is properly
managed.
(Check_Call): Account for the case where the tree may be
unanalyzed or contain prior errors.
(Has_Call_Using_Secondary_Stack): Renamed to Has_Sec_Stack_Call.
Update all uses of the subprogram.
(Prepare_Loop_Statement): New routine.
From-SVN: r264625
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| config | ||
| contrib | ||
| fixincludes | ||
| gcc | ||
| gnattools | ||
| gotools | ||
| include | ||
| INSTALL | ||
| intl | ||
| libada | ||
| libatomic | ||
| libbacktrace | ||
| libcc1 | ||
| libcpp | ||
| libdecnumber | ||
| libffi | ||
| libgcc | ||
| libgfortran | ||
| libgo | ||
| libgomp | ||
| libhsail-rt | ||
| libiberty | ||
| libitm | ||
| libobjc | ||
| liboffloadmic | ||
| libquadmath | ||
| libsanitizer | ||
| libssp | ||
| libstdc++-v3 | ||
| libvtv | ||
| lto-plugin | ||
| maintainer-scripts | ||
| zlib | ||
| .dir-locals.el | ||
| .gitattributes | ||
| .gitignore | ||
| ABOUT-NLS | ||
| ChangeLog | ||
| ChangeLog.jit | ||
| ChangeLog.tree-ssa | ||
| compile | ||
| config-ml.in | ||
| config.guess | ||
| config.rpath | ||
| config.sub | ||
| configure | ||
| configure.ac | ||
| COPYING | ||
| COPYING.LIB | ||
| COPYING.RUNTIME | ||
| COPYING3 | ||
| COPYING3.LIB | ||
| depcomp | ||
| install-sh | ||
| libtool-ldflags | ||
| libtool.m4 | ||
| ltgcc.m4 | ||
| ltmain.sh | ||
| ltoptions.m4 | ||
| ltsugar.m4 | ||
| ltversion.m4 | ||
| lt~obsolete.m4 | ||
| MAINTAINERS | ||
| Makefile.def | ||
| Makefile.in | ||
| Makefile.tpl | ||
| missing | ||
| mkdep | ||
| mkinstalldirs | ||
| move-if-change | ||
| README | ||
| symlink-tree | ||
| ylwrap | ||
This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the files whose names start with COPYING for copying permission. The manuals, and some of the runtime libraries, are under different terms; see the individual source files for details. The directory INSTALL contains copies of the installation information as HTML and plain text. The source of this information is gcc/doc/install.texi. The installation information includes details of what is included in the GCC sources and what files GCC installs. See the file gcc/doc/gcc.texi (together with other files that it includes) for usage and porting information. An online readable version of the manual is in the files gcc/doc/gcc.info*. See http://gcc.gnu.org/bugs/ for how to report bugs usefully. Copyright years on GCC source files may be listed using range notation, e.g., 1987-2012, indicating that every year in the range, inclusive, is a copyrightable year that could otherwise be listed individually.