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4.4.1-5

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This commit is contained in:
Jakub Jelinek 2009-08-07 08:40:28 +00:00
parent 4644e4c6ba
commit 2e22743b01
4 changed files with 12 additions and 394 deletions
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2
.cvsignore
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@ -1,2 +1,2 @@
fastjar-0.97.tar.gz
gcc-4.4.1-20090805.tar.bz2
gcc-4.4.1-20090807.tar.bz2

17
gcc.spec
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@ -1,9 +1,9 @@
%global DATE 20090805
%global SVNREV 150492
%global DATE 20090807
%global SVNREV 150557
%global gcc_version 4.4.1
# Note, gcc_release must be integer, if you want to add suffixes to
# %{release}, append them after %{gcc_release} on Release: line.
%global gcc_release 4
%global gcc_release 5
%global _unpackaged_files_terminate_build 0
%global multilib_64_archs sparc64 ppc64 s390x x86_64
%global include_gappletviewer 1
@ -163,8 +163,7 @@ Patch29: gcc44-libstdc++-docs.patch
Patch30: gcc44-rh503816-1.patch
Patch31: gcc44-rh503816-2.patch
Patch32: gcc44-unique-object.patch
Patch33: gcc44-builtin-unreachable.patch
Patch34: gcc44-pr40971.patch
Patch33: gcc44-pr40971.patch
Patch1000: fastjar-0.97-segfault.patch
@ -476,8 +475,7 @@ which are required to compile with the GNAT.
%patch30 -p0 -b .rh503816-1~
%patch31 -p0 -b .rh503816-2~
%patch32 -p0 -b .unique-object~
%patch33 -p0 -b .builtin-unreachable~
%patch34 -p0 -b .pr40971~
%patch33 -p0 -b .pr40971~
# This testcase doesn't compile.
rm libjava/testsuite/libjava.lang/PR35020*
@ -1816,6 +1814,11 @@ fi
%doc rpm.doc/changelogs/libmudflap/ChangeLog*
%changelog
* Fri Aug 7 2009 Jakub Jelinek <jakub@redhat.com> 4.4.1-5
- update from gcc-4_4-branch
- PRs c++/40948, target/40906
- -fexceptions support for -freorder-blocks-and-partition
* Wed Aug 5 2009 Jakub Jelinek <jakub@redhat.com> 4.4.1-4
- update from gcc-4_4-branch
- PRs build/40010, c++/39987, c++/40749, c++/40834, c++/40948, debug/39706,

385
gcc44-builtin-unreachable.patch
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@ -1,385 +0,0 @@
2009-07-25 David Daney <ddaney@caviumnetworks.com>
PR rtl-optimization/40445
* emit-rtl.c (next_nonnote_insn_bb): New function.
* rtl.h (next_nonnote_insn_bb): Declare new function.
* cfgcleanup.c (try_optimize_cfg): Don't remove an empty block
with no successors that is the successor of the ENTRY_BLOCK.
Continue from the top after removing an empty fallthrough block.
* cfgrtl.c (get_last_bb_insn): Call next_nonnote_insn_bb instead
of next_nonnote_insn.
* g++.dg/other/builtin-unreachable-1.C: New testcase.
2009-07-25 David Daney <ddaney@caviumnetworks.com>
* cfgcleanup.c (old_insns_match_p): Handle the case of empty
blocks.
* gcc.dg/builtin-unreachable-4.c: New test.
2009-06-17 David Daney <ddaney@caviumnetworks.com>
* jump.c (cleanup_barriers): Handle case of no insns before a
barrier.
* gcc.dg/builtin-unreachable-3.c: New test.
2009-06-17 David Daney <ddaney@caviumnetworks.com>
* gcc.target/i386/builtin-unreachable.c: New test.
2009-06-11 David Daney <ddaney@caviumnetworks.com>
PR c/39252
* doc/extend.texi ( __builtin_unreachable): Document new builtin.
* builtins.c (expand_builtin_unreachable): New function.
(expand_builtin): Handle BUILT_IN_UNREACHABLE case.
* builtins.def (BUILT_IN_UNREACHABLE): Add new builtin.
* cfgcleanup.c (try_optimize_cfg): Delete empty blocks with no
successors.
* cfgrtl.c (rtl_verify_flow_info): Handle empty blocks when
searching for missing barriers.
* gcc.dg/builtin-unreachable-1.c: New test.
* gcc.dg/builtin-unreachable-2.c: Same.
--- gcc/doc/extend.texi (revision 148402)
+++ gcc/doc/extend.texi (revision 148404)
@@ -6815,6 +6815,61 @@ intentionally executing an illegal instr
you should not rely on any particular implementation.
@end deftypefn
+@deftypefn {Built-in Function} void __builtin_unreachable (void)
+If control flow reaches the point of the @code{__builtin_unreachable},
+the program is undefined. It is useful in situations where the
+compiler cannot deduce the unreachability of the code.
+
+One such case is immediately following an @code{asm} statement that
+will either never terminate, or one that transfers control elsewhere
+and never returns. In this example, without the
+@code{__builtin_unreachable}, GCC would issue a warning that control
+reaches the end of a non-void function. It would also generate code
+to return after the @code{asm}.
+
+@smallexample
+int f (int c, int v)
+@{
+ if (c)
+ @{
+ return v;
+ @}
+ else
+ @{
+ asm("jmp error_handler");
+ __builtin_unreachable ();
+ @}
+@}
+@end smallexample
+
+Because the @code{asm} statement unconditionally transfers control out
+of the function, control will never reach the end of the function
+body. The @code{__builtin_unreachable} is in fact unreachable and
+communicates this fact to the compiler.
+
+Another use for @code{__builtin_unreachable} is following a call a
+function that never returns but that is not declared
+@code{__attribute__((noreturn))}, as in this example:
+
+@smallexample
+void function_that_never_returns (void);
+
+int g (int c)
+@{
+ if (c)
+ @{
+ return 1;
+ @}
+ else
+ @{
+ function_that_never_returns ();
+ __builtin_unreachable ();
+ @}
+@}
+@end smallexample
+
+@end deftypefn
+
@deftypefn {Built-in Function} void __builtin___clear_cache (char *@var{begin}, char *@var{end})
This function is used to flush the processor's instruction cache for
the region of memory between @var{begin} inclusive and @var{end}
--- gcc/builtins.c (revision 148402)
+++ gcc/builtins.c (revision 148404)
@@ -5298,6 +5298,17 @@ expand_builtin_trap (void)
emit_barrier ();
}
+/* Expand a call to __builtin_unreachable. We do nothing except emit
+ a barrier saying that control flow will not pass here.
+
+ It is the responsibility of the program being compiled to ensure
+ that control flow does never reach __builtin_unreachable. */
+static void
+expand_builtin_unreachable (void)
+{
+ emit_barrier ();
+}
+
/* Expand EXP, a call to fabs, fabsf or fabsl.
Return NULL_RTX if a normal call should be emitted rather than expanding
the function inline. If convenient, the result should be placed
@@ -6795,6 +6806,10 @@ expand_builtin (tree exp, rtx target, rt
expand_builtin_trap ();
return const0_rtx;
+ case BUILT_IN_UNREACHABLE:
+ expand_builtin_unreachable ();
+ return const0_rtx;
+
case BUILT_IN_PRINTF:
target = expand_builtin_printf (exp, target, mode, false);
if (target)
--- gcc/builtins.def (revision 148402)
+++ gcc/builtins.def (revision 148404)
@@ -698,6 +698,7 @@ DEF_GCC_BUILTIN (BUILT_IN_SETJMP,
DEF_EXT_LIB_BUILTIN (BUILT_IN_STRFMON, "strfmon", BT_FN_SSIZE_STRING_SIZE_CONST_STRING_VAR, ATTR_FORMAT_STRFMON_NOTHROW_3_4)
DEF_LIB_BUILTIN (BUILT_IN_STRFTIME, "strftime", BT_FN_SIZE_STRING_SIZE_CONST_STRING_CONST_PTR, ATTR_FORMAT_STRFTIME_NOTHROW_3_0)
DEF_GCC_BUILTIN (BUILT_IN_TRAP, "trap", BT_FN_VOID, ATTR_NORETURN_NOTHROW_LIST)
+DEF_GCC_BUILTIN (BUILT_IN_UNREACHABLE, "unreachable", BT_FN_VOID, ATTR_NORETURN_NOTHROW_LIST)
DEF_GCC_BUILTIN (BUILT_IN_UNWIND_INIT, "unwind_init", BT_FN_VOID, ATTR_NULL)
DEF_GCC_BUILTIN (BUILT_IN_UPDATE_SETJMP_BUF, "update_setjmp_buf", BT_FN_VOID_PTR_INT, ATTR_NULL)
DEF_GCC_BUILTIN (BUILT_IN_VA_COPY, "va_copy", BT_FN_VOID_VALIST_REF_VALIST_ARG, ATTR_NULL)
--- gcc/cfgcleanup.c (revision 148402)
+++ gcc/cfgcleanup.c (revision 148404)
@@ -953,7 +953,12 @@ old_insns_match_p (int mode ATTRIBUTE_UN
if (GET_CODE (i1) != GET_CODE (i2))
return false;
- p1 = PATTERN (i1);
+ /* __builtin_unreachable() may lead to empty blocks (ending with
+ NOTE_INSN_BASIC_BLOCK). They may be crossjumped. */
+ if (NOTE_INSN_BASIC_BLOCK_P (i1) && NOTE_INSN_BASIC_BLOCK_P (i2))
+ return true;
+
+ p1 = PATTERN (i1);
p2 = PATTERN (i2);
if (GET_CODE (p1) != GET_CODE (p2))
@@ -1873,8 +1878,18 @@ try_optimize_cfg (int mode)
edge s;
bool changed_here = false;
- /* Delete trivially dead basic blocks. */
- if (EDGE_COUNT (b->preds) == 0)
+ /* Delete trivially dead basic blocks. This is either
+ blocks with no predecessors, or empty blocks with no
+ successors. However if the empty block with no
+ successors is the successor of the ENTRY_BLOCK, it is
+ kept. This ensures that the ENTRY_BLOCK will have a
+ successor which is a precondition for many RTL
+ passes. Empty blocks may result from expanding
+ __builtin_unreachable (). */
+ if (EDGE_COUNT (b->preds) == 0
+ || (EDGE_COUNT (b->succs) == 0
+ && BB_HEAD (b) == BB_END (b)
+ && single_succ_edge (ENTRY_BLOCK_PTR)->dest != b))
{
c = b->prev_bb;
if (dump_file)
@@ -1946,6 +1961,7 @@ try_optimize_cfg (int mode)
delete_basic_block (b);
changed = true;
b = c;
+ continue;
}
if (single_succ_p (b)
--- gcc/cfgrtl.c (revision 148402)
+++ gcc/cfgrtl.c (revision 148404)
@@ -1708,11 +1708,11 @@ get_last_bb_insn (basic_block bb)
end = tmp;
/* Include any barriers that may follow the basic block. */
- tmp = next_nonnote_insn (end);
+ tmp = next_nonnote_insn_bb (end);
while (tmp && BARRIER_P (tmp))
{
end = tmp;
- tmp = next_nonnote_insn (end);
+ tmp = next_nonnote_insn_bb (end);
}
return end;
@@ -2040,15 +2040,17 @@ rtl_verify_flow_info (void)
rtx insn;
/* Ensure existence of barrier in BB with no fallthru edges. */
- for (insn = BB_END (bb); !insn || !BARRIER_P (insn);
- insn = NEXT_INSN (insn))
- if (!insn
- || NOTE_INSN_BASIC_BLOCK_P (insn))
+ for (insn = NEXT_INSN (BB_END (bb)); ; insn = NEXT_INSN (insn))
+ {
+ if (!insn || NOTE_INSN_BASIC_BLOCK_P (insn))
{
error ("missing barrier after block %i", bb->index);
err = 1;
break;
}
+ if (BARRIER_P (insn))
+ break;
+ }
}
else if (e->src != ENTRY_BLOCK_PTR
&& e->dest != EXIT_BLOCK_PTR)
--- gcc/jump.c (revision 148623)
+++ gcc/jump.c (revision 148624)
@@ -113,6 +113,8 @@ cleanup_barriers (void)
if (BARRIER_P (insn))
{
prev = prev_nonnote_insn (insn);
+ if (!prev)
+ continue;
if (BARRIER_P (prev))
delete_insn (insn);
else if (prev != PREV_INSN (insn))
--- gcc/emit-rtl.c (revision 150088)
+++ gcc/emit-rtl.c (revision 150090)
@@ -2998,6 +2998,25 @@ next_nonnote_insn (rtx insn)
return insn;
}
+/* Return the next insn after INSN that is not a NOTE, but stop the
+ search before we enter another basic block. This routine does not
+ look inside SEQUENCEs. */
+
+rtx
+next_nonnote_insn_bb (rtx insn)
+{
+ while (insn)
+ {
+ insn = NEXT_INSN (insn);
+ if (insn == 0 || !NOTE_P (insn))
+ break;
+ if (NOTE_INSN_BASIC_BLOCK_P (insn))
+ return NULL_RTX;
+ }
+
+ return insn;
+}
+
/* Return the previous insn before INSN that is not a NOTE. This routine does
not look inside SEQUENCEs. */
--- gcc/rtl.h (revision 150088)
+++ gcc/rtl.h (revision 150090)
@@ -1626,6 +1626,7 @@ extern rtx previous_insn (rtx);
extern rtx next_insn (rtx);
extern rtx prev_nonnote_insn (rtx);
extern rtx next_nonnote_insn (rtx);
+extern rtx next_nonnote_insn_bb (rtx);
extern rtx prev_real_insn (rtx);
extern rtx next_real_insn (rtx);
extern rtx prev_active_insn (rtx);
--- gcc/testsuite/gcc.dg/builtin-unreachable-2.c (revision 0)
+++ gcc/testsuite/gcc.dg/builtin-unreachable-2.c (revision 148404)
@@ -0,0 +1,20 @@
+/* Check that __builtin_unreachable() is a no-return function thus
+ causing the dead call to foo() to be removed. The comparison is
+ dead too, and should be removed. */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-optimized -fdump-rtl-cse1" } */
+void foo (void);
+
+int
+f (int i)
+{
+ if (i > 1)
+ __builtin_unreachable();
+ if (i > 1)
+ foo ();
+ return 1;
+}
+/* { dg-final { scan-tree-dump-not "foo" "optimized" } } */
+/* { dg-final { scan-rtl-dump-not "\\(if_then_else" "cse1" } } */
+/* { dg-final { cleanup-tree-dump "optimized" } } */
+/* { dg-final { cleanup-rtl-dump "cse1" } } */
--- gcc/testsuite/gcc.dg/builtin-unreachable-1.c (revision 0)
+++ gcc/testsuite/gcc.dg/builtin-unreachable-1.c (revision 148404)
@@ -0,0 +1,17 @@
+/* Check that __builtin_unreachable() prevents the 'control reaches
+ end of non-void function' diagnostic. */
+/* { dg-do compile } */
+/* { dg-options "-O2 -Wreturn-type" } */
+int
+f(int a, int b)
+{
+ if (a)
+ {
+ return b;
+ }
+ else
+ {
+ asm ("bug");
+ __builtin_unreachable();
+ }
+}
--- gcc/testsuite/gcc.dg/builtin-unreachable-3.c (revision 0)
+++ gcc/testsuite/gcc.dg/builtin-unreachable-3.c (revision 148624)
@@ -0,0 +1,9 @@
+/* Check that a function containing only __builtin_unreachable()
+ doesn't ICE. */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+const char *
+f (void)
+{
+ __builtin_unreachable ();
+}
--- gcc/testsuite/gcc.target/i386/builtin-unreachable.c (revision 0)
+++ gcc/testsuite/gcc.target/i386/builtin-unreachable.c (revision 148622)
@@ -0,0 +1,13 @@
+/* This should return 1 without setting up a stack frame or
+ jumping. */
+/* { dg-do compile } */
+/* { dg-require-effective-target ilp32 } */
+/* { dg-options "-O2 -fomit-frame-pointer" } */
+int h (char *p)
+{
+ if (*p)
+ __builtin_unreachable ();
+ return p ? 1 : 0;
+}
+/* { dg-final { scan-assembler-not "%e\[bs\]p" } } */
+/* { dg-final { scan-assembler-not "\[\\t \]+j" } } */
--- gcc/testsuite/gcc.dg/builtin-unreachable-4.c (revision 0)
+++ gcc/testsuite/gcc.dg/builtin-unreachable-4.c (revision 150090)
@@ -0,0 +1,14 @@
+/* Check that this valid code doesn't ICE. */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+void
+g (int a, int b, int c, int d)
+{
+ if (d)
+ {
+ ((void)
+ (!(a && b && c) ? __builtin_unreachable (), 0 : 0));
+ }
+ ((void)
+ (!(a && b && c) ? __builtin_unreachable (), 0 : 0));
+}
--- gcc/testsuite/g++.dg/other/builtin-unreachable-1.C (revision 0)
+++ gcc/testsuite/g++.dg/other/builtin-unreachable-1.C (revision 150090)
@@ -0,0 +1,11 @@
+// PR c++/40445
+// Check that a function containing only __builtin_unreachable()
+// doesn't ICE.
+
+// { dg-do compile }
+// { dg-options "-O0" }
+const char *
+f (void)
+{
+ __builtin_unreachable ();
+}

2
sources
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2659f09c2e43ef8b7d4406321753f1b2 fastjar-0.97.tar.gz
ab532d487e6e0e1a1a3dd2f202a121b3 gcc-4.4.1-20090805.tar.bz2
4ca33c6e0f65f7a29a2f8117d025006d gcc-4.4.1-20090807.tar.bz2