re PR target/77957 (Undefined .LCTOC0 with -fstack-protector-strong -mminimal-toc -O0 on ppc64)

	PR target/77957
	* hooks.h (hook_tree_void_null): Declare.
	* hooks.c (hook_tree_void_null): New function.
	* langhooks.c (lhd_return_null_tree_v): Remove.
	* langhooks-def.h (lhd_return_null_tree_v): Remove.
	* cfgexpand.c (stack_protect_prologue): If guard_decl is NULL,
	set y to const0_rtx.
	* function.c (stack_protect_epilogue): Likewise.
	* config/tilepro/tilepro.c (TARGET_STACK_PROTECT_GUARD): Redefine
	if TARGET_THREAD_SSP_OFFSET is defined.
	* config/s390/s390.c (TARGET_STACK_PROTECT_GUARD): Likewise.
	* config/sparc/sparc.c (TARGET_STACK_PROTECT_GUARD): Likewise.
	* config/tilegx/tilegx.c (TARGET_STACK_PROTECT_GUARD): Likewise.
	* config/rs6000/rs6000.c (TARGET_STACK_PROTECT_GUARD): Likewise.
	* config/i386/i386.c (TARGET_STACK_PROTECT_GUARD): Likewise.
	(ix86_stack_protect_guard): New function.
c/
	* c-objc-common.h (LANG_HOOKS_GETDECLS): Use hook_tree_void_null
	instead of lhd_return_null_tree_v.
ada/
	* gcc-interface/misc.c (LANG_HOOKS_GETDECLS): Use hook_tree_void_null
	instead of lhd_return_null_tree_v.

From-SVN: r241087

17 files changed, 91 insertions, 13 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 4bc6f6c..843d06a 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,22 @@
+2016-10-13  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/77957
+	* hooks.h (hook_tree_void_null): Declare.
+	* hooks.c (hook_tree_void_null): New function.
+	* langhooks.c (lhd_return_null_tree_v): Remove.
+	* langhooks-def.h (lhd_return_null_tree_v): Remove.
+	* cfgexpand.c (stack_protect_prologue): If guard_decl is NULL,
+	set y to const0_rtx.
+	* function.c (stack_protect_epilogue): Likewise.
+	* config/tilepro/tilepro.c (TARGET_STACK_PROTECT_GUARD): Redefine
+	if TARGET_THREAD_SSP_OFFSET is defined.
+	* config/s390/s390.c (TARGET_STACK_PROTECT_GUARD): Likewise.
+	* config/sparc/sparc.c (TARGET_STACK_PROTECT_GUARD): Likewise.
+	* config/tilegx/tilegx.c (TARGET_STACK_PROTECT_GUARD): Likewise.
+	* config/rs6000/rs6000.c (TARGET_STACK_PROTECT_GUARD): Likewise.
+	* config/i386/i386.c (TARGET_STACK_PROTECT_GUARD): Likewise.
+	(ix86_stack_protect_guard): New function.
+
 2016-10-13  Richard Biener  <rguenther@suse.de>
 
 	* dwarf2out.c (tree_add_const_value_attribute): Do not try
diff --git a/gcc/ada/ChangeLog b/gcc/ada/ChangeLog
index 8809033..f088e8b 100644
--- a/gcc/ada/ChangeLog
+++ b/gcc/ada/ChangeLog
@@ -1,3 +1,9 @@
+2016-10-13  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/77957
+	* gcc-interface/misc.c (LANG_HOOKS_GETDECLS): Use hook_tree_void_null
+	instead of lhd_return_null_tree_v.
+
 2016-10-12  Yannick Moy  <moy@adacore.com>
 
 	* einfo.adb, einfo.ads (Partial_Refinement_Constituents): Take
diff --git a/gcc/ada/gcc-interface/misc.c b/gcc/ada/gcc-interface/misc.c
index 236a083..cf29210 100644
--- a/gcc/ada/gcc-interface/misc.c
+++ b/gcc/ada/gcc-interface/misc.c
@@ -1366,7 +1366,7 @@ get_lang_specific (tree node)
 #undef  LANG_HOOKS_TYPE_HASH_EQ
 #define LANG_HOOKS_TYPE_HASH_EQ		gnat_type_hash_eq
 #undef  LANG_HOOKS_GETDECLS
-#define LANG_HOOKS_GETDECLS		lhd_return_null_tree_v
+#define LANG_HOOKS_GETDECLS		hook_tree_void_null
 #undef  LANG_HOOKS_PUSHDECL
 #define LANG_HOOKS_PUSHDECL		gnat_return_tree
 #undef  LANG_HOOKS_WARN_UNUSED_GLOBAL_DECL
diff --git a/gcc/c/ChangeLog b/gcc/c/ChangeLog
index c5dd848..63fba12 100644
--- a/gcc/c/ChangeLog
+++ b/gcc/c/ChangeLog
@@ -1,3 +1,9 @@
+2016-10-13  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/77957
+	* c-objc-common.h (LANG_HOOKS_GETDECLS): Use hook_tree_void_null
+	instead of lhd_return_null_tree_v.
+
 2016-10-07  Bernd Schmidt  <bschmidt@redhat.com>
 
 	PR c++/69733
diff --git a/gcc/c/c-objc-common.h b/gcc/c/c-objc-common.h
index 14554ac..c86e40e 100644
--- a/gcc/c/c-objc-common.h
+++ b/gcc/c/c-objc-common.h
@@ -91,7 +91,7 @@ along with GCC; see the file COPYING3.  If not see
    This means it must also provide its own write_globals.  */
 
 #undef LANG_HOOKS_GETDECLS
-#define LANG_HOOKS_GETDECLS lhd_return_null_tree_v
+#define LANG_HOOKS_GETDECLS hook_tree_void_null
 
 /* Hooks for tree gimplification.  */
 #undef LANG_HOOKS_GIMPLIFY_EXPR
diff --git a/gcc/cfgexpand.c b/gcc/cfgexpand.c
index c7a2faa..c62e920 100644
--- a/gcc/cfgexpand.c
+++ b/gcc/cfgexpand.c
@@ -6100,7 +6100,10 @@ stack_protect_prologue (void)
   rtx x, y;
 
   x = expand_normal (crtl->stack_protect_guard);
-  y = expand_normal (guard_decl);
+  if (guard_decl)
+    y = expand_normal (guard_decl);
+  else
+    y = const0_rtx;
 
   /* Allow the target to copy from Y to X without leaking Y into a
      register.  */
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index f694611..eef6d7b 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -44023,6 +44023,18 @@ ix86_mangle_type (const_tree type)
     }
 }
 
+#ifdef TARGET_THREAD_SSP_OFFSET
+/* If using TLS guards, don't waste time creating and expanding
+   __stack_chk_guard decl and MEM as we are going to ignore it.  */
+static tree
+ix86_stack_protect_guard (void)
+{
+  if (TARGET_SSP_TLS_GUARD)
+    return NULL_TREE;
+  return default_stack_protect_guard ();
+}
+#endif
+
 /* For 32-bit code we can save PIC register setup by using
    __stack_chk_fail_local hidden function instead of calling
    __stack_chk_fail directly.  64-bit code doesn't need to setup any PIC
@@ -50614,6 +50626,11 @@ ix86_addr_space_zero_address_valid (addr_space_t as)
 #undef TARGET_MANGLE_TYPE
 #define TARGET_MANGLE_TYPE ix86_mangle_type
 
+#ifdef TARGET_THREAD_SSP_OFFSET
+#undef TARGET_STACK_PROTECT_GUARD
+#define TARGET_STACK_PROTECT_GUARD ix86_stack_protect_guard
+#endif
+
 #if !TARGET_MACHO
 #undef TARGET_STACK_PROTECT_FAIL
 #define TARGET_STACK_PROTECT_FAIL ix86_stack_protect_fail
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 1110ee2..c688e87 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -1752,6 +1752,11 @@ static const struct attribute_spec rs6000_attribute_table[] =
 #define TARGET_VECTORIZE_BUILTIN_MD_VECTORIZED_FUNCTION \
   rs6000_builtin_md_vectorized_function
 
+#ifdef TARGET_THREAD_SSP_OFFSET
+#undef TARGET_STACK_PROTECT_GUARD
+#define TARGET_STACK_PROTECT_GUARD hook_tree_void_null
+#endif
+
 #if !TARGET_MACHO
 #undef TARGET_STACK_PROTECT_FAIL
 #define TARGET_STACK_PROTECT_FAIL rs6000_stack_protect_fail
diff --git a/gcc/config/s390/s390.c b/gcc/config/s390/s390.c
index 3bdb648..04d6d44 100644
--- a/gcc/config/s390/s390.c
+++ b/gcc/config/s390/s390.c
@@ -15124,6 +15124,11 @@ s390_invalid_binary_op (int op ATTRIBUTE_UNUSED, const_tree type1, const_tree ty
 #undef TARGET_OPTION_OVERRIDE
 #define TARGET_OPTION_OVERRIDE s390_option_override
 
+#ifdef TARGET_THREAD_SSP_OFFSET
+#undef TARGET_STACK_PROTECT_GUARD
+#define TARGET_STACK_PROTECT_GUARD hook_tree_void_null
+#endif
+
 #undef	TARGET_ENCODE_SECTION_INFO
 #define TARGET_ENCODE_SECTION_INFO s390_encode_section_info
 
diff --git a/gcc/config/sparc/sparc.c b/gcc/config/sparc/sparc.c
index f721ec2..ac05d96 100644
--- a/gcc/config/sparc/sparc.c
+++ b/gcc/config/sparc/sparc.c
@@ -798,6 +798,11 @@ char sparc_hard_reg_printed[8];
 #undef TARGET_OPTION_OVERRIDE
 #define TARGET_OPTION_OVERRIDE sparc_option_override
 
+#ifdef TARGET_THREAD_SSP_OFFSET
+#undef TARGET_STACK_PROTECT_GUARD
+#define TARGET_STACK_PROTECT_GUARD hook_tree_void_null
+#endif
+
 #if TARGET_GNU_TLS && defined(HAVE_AS_SPARC_UA_PCREL)
 #undef TARGET_ASM_OUTPUT_DWARF_DTPREL
 #define TARGET_ASM_OUTPUT_DWARF_DTPREL sparc_output_dwarf_dtprel
diff --git a/gcc/config/tilegx/tilegx.c b/gcc/config/tilegx/tilegx.c
index d743c63..0ef7559 100644
--- a/gcc/config/tilegx/tilegx.c
+++ b/gcc/config/tilegx/tilegx.c
@@ -5544,6 +5544,11 @@ tilegx_file_end (void)
 #undef  TARGET_OPTION_OVERRIDE
 #define TARGET_OPTION_OVERRIDE tilegx_option_override
 
+#ifdef TARGET_THREAD_SSP_OFFSET
+#undef TARGET_STACK_PROTECT_GUARD
+#define TARGET_STACK_PROTECT_GUARD hook_tree_void_null
+#endif
+
 #undef  TARGET_SCALAR_MODE_SUPPORTED_P
 #define TARGET_SCALAR_MODE_SUPPORTED_P tilegx_scalar_mode_supported_p
 
diff --git a/gcc/config/tilepro/tilepro.c b/gcc/config/tilepro/tilepro.c
index b39eff4..505c7a4 100644
--- a/gcc/config/tilepro/tilepro.c
+++ b/gcc/config/tilepro/tilepro.c
@@ -4948,6 +4948,11 @@ tilepro_file_end (void)
 #undef  TARGET_OPTION_OVERRIDE
 #define TARGET_OPTION_OVERRIDE tilepro_option_override
 
+#ifdef TARGET_THREAD_SSP_OFFSET
+#undef TARGET_STACK_PROTECT_GUARD
+#define TARGET_STACK_PROTECT_GUARD hook_tree_void_null
+#endif
+
 #undef  TARGET_SCALAR_MODE_SUPPORTED_P
 #define TARGET_SCALAR_MODE_SUPPORTED_P tilepro_scalar_mode_supported_p
 
diff --git a/gcc/function.c b/gcc/function.c
index 5dafb8c..6f906ab 100644
--- a/gcc/function.c
+++ b/gcc/function.c
@@ -5058,7 +5058,10 @@ stack_protect_epilogue (void)
   rtx_insn *seq;
 
   x = expand_normal (crtl->stack_protect_guard);
-  y = expand_normal (guard_decl);
+  if (guard_decl)
+    y = expand_normal (guard_decl);
+  else
+    y = const0_rtx;
 
   /* Allow the target to compare Y with X without leaking either into
      a register.  */
diff --git a/gcc/hooks.c b/gcc/hooks.c
index 917bb6e..3995786 100644
--- a/gcc/hooks.c
+++ b/gcc/hooks.c
@@ -429,6 +429,13 @@ hook_tree_const_tree_null (const_tree)
   return NULL;
 }
 
+/* Generic hook that takes no arguments and returns a NULL_TREE.  */
+tree
+hook_tree_void_null (void)
+{
+  return NULL;
+}
+
 /* Generic hook that takes a rtx_insn * and an int and returns a bool.  */
 
 bool
diff --git a/gcc/hooks.h b/gcc/hooks.h
index 0cdfc81..a1d6776 100644
--- a/gcc/hooks.h
+++ b/gcc/hooks.h
@@ -89,6 +89,7 @@ extern int hook_int_rtx_mode_as_bool_0 (rtx, machine_mode, addr_space_t,
 					bool);
 
 extern tree hook_tree_const_tree_null (const_tree);
+extern tree hook_tree_void_null (void);
 
 extern tree hook_tree_tree_tree_null (tree, tree);
 extern tree hook_tree_tree_tree_tree_null (tree, tree, tree);
diff --git a/gcc/langhooks-def.h b/gcc/langhooks-def.h
index cf5f91d..fb6b505 100644
--- a/gcc/langhooks-def.h
+++ b/gcc/langhooks-def.h
@@ -41,7 +41,6 @@ extern void lhd_do_nothing_f (struct function *);
 extern tree lhd_pass_through_t (tree);
 extern bool lhd_post_options (const char **);
 extern alias_set_type lhd_get_alias_set (tree);
-extern tree lhd_return_null_tree_v (void);
 extern tree lhd_return_null_tree (tree);
 extern tree lhd_return_null_const_tree (const_tree);
 extern tree lhd_do_nothing_iii_return_null_tree (int, int, int);
diff --git a/gcc/langhooks.c b/gcc/langhooks.c
index 69cdb94..792eb48 100644
--- a/gcc/langhooks.c
+++ b/gcc/langhooks.c
@@ -77,14 +77,6 @@ lhd_do_nothing_f (struct function * ARG_UNUSED (f))
 /* Do nothing (return NULL_TREE).  */
 
 tree
-lhd_return_null_tree_v (void)
-{
-  return NULL_TREE;
-}
-
-/* Do nothing (return NULL_TREE).  */
-
-tree
 lhd_return_null_tree (tree ARG_UNUSED (t))
 {
   return NULL_TREE;