Enhance the DWARF back-end to emit proper descriptions for
variable-length records as well as variant parts in records.

In order to achieve this, generate DWARF expressions ("location
descriptions" in dwarf2out's parlance) for size and data member location
attributes.  Also match QUAL_UNION_TYPE data types as variant parts,
assuming the formers appear only to implement the latters (which is the
case at the moment: only the Ada front-end emits them).

Note that very few debuggers can handle these descriptions (GDB does not
yet), so in order to ease the the transition enable these only when
-fgnat-encodings=minimal.

gcc/ada/ChangeLog:

	* gcc-interface/decl.c (gnat_to_gnu_entity): Disable ___XVS GNAT
	encodings when -fgnat-encodings=minimal.
	(components_to_record): Disable ___XVE, ___XVN, ___XVU and
	___XVZ GNAT encodings when -fgnat-encodings=minimal.
	* gcc-interface/utils.c (maybe_pad_type): Disable __XVS GNAT
	encodings when -fgnat-encodings=minimal.

gcc/ChangeLog:

	* debug.h (struct gcc_debug_hooks): Add a new size_function
	hook.
	* debug.c (do_nothing_debug_hooks): Set the size_function field
	to no-op.
	* dbxout.c (dbx_debug_hooks, xcoff_debug_hooks): Likewise.
	* sdbout.c (sdb_debug_hooks): Likewise.
	* vmsdbgout.c (vmsdbg_debug_hooks): Likewise.
	* stor-layout.c (finalize_size_functions): Let the debug info
	back-end know about the implementation of size functions.
	* dwarf2out.h (dw_discr_list_ref): New typedef.
	(enum dw_val_class): Add value classes for discriminant values
	and discriminant lists.
	(struct dw_discr_value): New structure.
	(struct dw_val_node): Add discriminant values and discriminant
	lists to the union.
	(struct dw_loc_descr_node): Add frame_offset_rel and
	dw_loc_frame_offset (only for checking) fields to handle DWARF
	procedures generation.
	(struct dw_discr_list_node): New structure.
	* dwarf2out.c (dwarf2out_size_function): New.
	(dwarf2_debug_hooks): Set the size_function field to
	dwarf2out_size_function.
	(dwarf2_lineno_debug_hooks): Set the size_function field to
	no-op.
	(new_loc_descr): Initialize the
	dw_loc_frame_offset field.
	(dwarf_proc_stack_usage_map): New.
	(dw_val_equal_p): Handle discriminants.
	(size_of_discr_value): New.
	(size_of_discr_list): New.
	(size_of_die): Handle discriminants.
	(add_loc_descr_to_each): New.
	(add_loc_list): New.
	(print_discr_value): New.
	(print_dw_val): Handle discriminants.
	(value_format): Handle discriminants.
	(output_discr_value): New.
	(output_die): Handle discriminants.
	(output_loc_operands): Handle DW_OP_call2 and DW_OP_call4.
	(uint_loc_descriptor): New.
	(uint_comparison_loc_list): New.
	(loc_list_from_uint_comparison): New.
	(add_discr_value): New.
	(add_discr_list): New.
	(AT_discr_list): New.
	(loc_descr_to_next_no_op): New.
	(free_loc_descr): New.
	(loc_descr_without_nops): New.
	(struct loc_descr_context): Add a dpi field.
	(struct dwarf_procedure_info): New helper structure.
	(new_dwarf_proc_die): New.
	(is_handled_procedure_type): New.
	(resolve_args_picking_1): New.
	(resolve_args_picking): New.
	(function_to_dwarf_procedure): New.
	(copy_dwarf_procedure): New.
	(copy_dwarf_procs_ref_in_attrs): New.
	(copy_dwarf_procs_ref_in_dies): New.
	(break_out_comdat_types): Copy DWARF procedures along with the
	types that reference them.
	(loc_list_from_tree): Rename into loc_list_from_tree_1.  Handle
	CALL_EXPR in the cases suitable for DWARF procedures.  Handle
	for PARM_DECL when generating a location description for a DWARF
	procedure.  Handle big unsigned INTEGER_CST nodes.  Handle
	NON_LVALUE_EXPR, EXACT_DIV_EXPR and all unsigned comparison
	operators.  Add a wrapper for loc_list_from_tree that strips
	DW_OP_nop operations from the result.
	(type_byte_size): New.
	(struct vlr_context): New helper structure.
	(field_byte_offset): Change signature to return either a
	constant offset or a location description for dynamic ones.
	Handle dynamic byte offsets with constant bit offsets and handle
	fields in variant parts.
	(add_data_member_location): Change signature to handle dynamic
	member offsets and fields in variant parts.  Update call to
	field_byte_offset.  Handle location lists.  Emit a variable data
	member location only when -fgnat-encodings=minimal.
	(add_bound_info): Emit self-referential bounds only when
	-fgnat-encodings=minimal.
	(add_byte_size_attribute): Use type_byte_size in order to handle
	dynamic type sizes.  Emit variable byte size only when
	-fgnat-encodings=minimal and when the target DWARF version
	allows them.
	(add_bit_offset_attribute): Change signature to handle
	variable-length records.  Update call to field_byte_offset.
	(gen_descr_array_type_die): Update call to gen_field_die.
	Update loc_descr_context literal.
	(gen_type_die_for_member): Likewise.
	(gen_subprogram_die): Update calls to get_decl_die.
	(gen_field_die): Change signature to handle variable-length
	records.  Update calls to add_bit_offset_attribute and
	add_data_member_location_attribute.
	(gen_inheritance_die): Update call to
	add_data_member_location_attribute.
	(gen_decl_die): Change signature to handle variable-length
	records.  Update call to gen_field_die.
	(gen_inheritance_die): Change signature to handle
	variable-length records.  Update call to
	add_data_member_location_attribute.
	(is_variant_part): New.
	(analyze_discr_in_predicate): New.
	(get_discr_value): New.
	(analyze_variants_discr): New.
	(gen_variant_part): New.
	(gen_member_die): Update calls to gen_decl_die.  Call instead
	gen_variant_part for variant parts.
	(gen_type_die_with_usage): Update calls to gen_decl_die.
	(process_scope_var): Likewise.
	(force_decl_die): Likewise.
	(declare_in_namespace): Likewise.
	(dwarf2out_decl): Likewise.
	(prune_unused_types_walk_loc_descr): New.
	(prune_unused_types_walk_attribs): Mark DIEs referenced by
	location descriptions and loc. descr. lists.
	(prune_unused_types_walk): Don't mark DWARF procedures by
	default.  Mark variant parts since nothing is supposed to
	reference them.
	(dwarf2out_init): Allocate dwarf_proc_stack_usage_map.
	(dwarf2out_c_finalize): Deallocate and reset
	dwarf_proc_stack_usage_map.

gcc/testsuite/ChangeLog:

	* gnat.dg/specs/debug1.ads: Update the expected number of
	DW_AT_artificial attribute in compiler output.

From-SVN: r231762

In order to accomodate the debugger's support evolution for "new" DWARF
constructs, we need to have an flag that controls the amount of GNAT
encodings/standard DWARF information that is emitted in the debug info.
Propagate this new parameter into the Ada front-end.

gcc/ChangeLog:

	* common.opt (gnat_encodings): New variable
	(dwarf_gnat_encodings): New enum type.
	(fgnat_encodings): New option.
	* flag-types.h (enum dwarf_gnat_encodings): New.

gcc/ada/ChangeLog:

	* gcc-interface/misc.c (gnat_encodings): Undefine macro and
	declare a global variable.
	(gnat_post_options): Initialize this global from options.

From-SVN: r231761

	* config/isl.m4 (ISL_CHECK_VERSION): Add gmp libs.
	* configure: Regenerate.

From-SVN: r231759

2015-12-17  Christian Bruel  <christian.bruel@st.com>

	* tree.h (TYPE_MODE_RAW): New macro.
	* tree-streamer-out.c (pack_ts_type_common_value_fields):
	Replace TYPE_MODE by TYPE_MODE_RAW.

From-SVN: r231758

	PR tree-optimization/68835
	* tree.c (get_int_cst_ext_nunits): Return
	cst.get_precision () / HOST_BITS_PER_WIDE_INT + 1
	for all unsigned wi::neg_p (cst) constants.
	(build_new_int_cst): If cst.get_precision is not a multiple
	of HOST_BITS_PER_WIDE_INT, zero extend -1 to the precision
	% HOST_BITS_PER_WIDE_INT.

	* gcc.dg/pr68835-1.c: New test.
	* gcc.dg/pr68835-2.c: New test.

From-SVN: r231757

PR c++/59878 -> PR c++/59879

From-SVN: r231755

2015-12-17  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/68951
	* tree-vect-data-refs.c (vect_peeling_hash_get_lowest_cost):
	Ignore strided non-group accesses.

	* gcc.dg/torture/pr68951.c: New testcase.

From-SVN: r231754

arc.c (arc_loop_hazard): Don't convert the jump label rtx to an rtx_insn until we confirm it's not a...

2015-12-17  Andrew Burgess  <andrew.burgess@embecosm.com>
gcc:
        * config/arc/arc.c (arc_loop_hazard): Don't convert the jump label
        rtx to an rtx_insn until we confirm it's not a return rtx.
gcc/testsuite:
        * gcc.target/arc/loop-hazard-1.c: New file

From-SVN: r231752

2015-12-17  Richard Biener  <rguenther@suse.de>

	* gimple-ssa.h (struct gimple_df): Remove modified_noreturn_calls
	field.
	* tree-ssa.c (delete_tree_ssa): Do not zero it.

From-SVN: r231751

	gcc:
	PR target/67973
	* configure.ac (gcc_cv_as_stabs_directive): New test.
	* configure: Regenerate.
	* config.in: Regenerate.
	* config/darwin.h (DBX_DEBUGGING_INFO): Wrap in
	HAVE_AS_STABS_DIRECTIVE.
	(PREFERRED_DEBUGGING_TYPE): Likewise.
	* config/i386/darwin.h (PREFERRED_DEBUGGING_TYPE): Only include
	DBX_DEBUG if HAVE_AS_STABS_DIRECTIVE.

	* doc/sourcebuild.texi (Effective-Target Keywords, Environment
	attributes): Document stabs.

	gcc/testsuite:
	PR target/67973
	* lib/target-supports.exp (check_effective_target_stabs): New
	proc.
	* g++.dg/cpp0x/alias-decl-debug-0.C: Restrict to stabs targets.
	* g++.dg/other/PR23205.C: Likewise.
	* g++.dg/other/pr23205-2.C: Likewise.
	* gcc.dg/20040813-1.c: Likewise.
	* gcc.dg/darwin-20040809-2.c: Likewise.
	* objc.dg/stabs-1.m: Likewise.

From-SVN: r231747

2015-12-17  Andrew Burgess  <andrew.burgess@embecosm.com>

        * gcc.target/arc/jump-around-jump.c (rtc_set_time): Declare.

From-SVN: r231746

2015-12-17  Thomas Preud'homme  <thomas.preudhomme@arm.com>

    Revert:
    2015-12-14  Thomas Preud'homme  <thomas.preudhomme@arm.com>

    PR testsuite/68629
    * lib/target-supports.exp (check_effective_target_cilkplus): Also
    check that compiling with -fcilkplus does not give an error.
    * c-c++-common/attr-simd-3.c: Require cilkplus effective target.

From-SVN: r231745

gcc/cp/ChangeLog:

	PR c++/16333
	PR c++/41426
	PR c++/59878
	PR c++/66895
	* typeck.c (convert_for_initialization): Don't perform an early
	decaying conversion if converting to a class type.

gcc/testsuite/ChangeLog:

	PR c++/16333
	PR c++/41426
	PR c++/59878
	PR c++/66895
	* g++.dg/conversion/pr16333.C: New test.
	* g++.dg/conversion/pr41426.C: New test.
	* g++.dg/conversion/pr59878.C: New test.
	* g++.dg/conversion/pr66895.C: New test.

From-SVN: r231736

gcc/cp/ChangeLog:

	* tree.c (cp_tree_operand_length): Define in terms of
	cp_tree_code_length.

From-SVN: r231735

From-SVN: r231734

gcc/ChangeLog
	* ginclude/stdatomic.h (atomic_init): Use atomic_store instead
	of plain assignment.
gcc/testsuite/ChangeLog
	* testsuite/gcc.dg/atomic/stdatomic-init.c: New test.

From-SVN: r231733

[gcc]
2015-12-15  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/68805
	* config/rs6000/rs6000.c (rs6000_gen_le_vsx_permute): Use ROTATE
	instead of VEC_SELECT for TImode.

	* config/rs6000/vsx.md (VSX_LE): Move TImode from VSX_LE to
	VSX_LE_128, so that we use ROTATE to swap the 64-bit words instead
	of using VEC_SELECT.
	(VSX_LE_128): Likewise.
	(define_peephole2): Add peephole to eliminate double xxpermdi when
	copying TImode.

[gcc/testsuite]
2015-12-15  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/68805
	* gcc.target/powerpc/pr68805.c: New test.

From-SVN: r231732

From-SVN: r231731

	PR target/68779
	* config/pa/pa.md (atomic_loaddi): Honor -mdisable-fpregs.
	(atomic_loaddi_1): Likewise.
	(atomic_storedi): Likewise.
	(atomic_storedi_1): Likewise.
	(atomic_loaddf): Likewise.
	(atomic_loaddf_1): Likewise.
	(atomic_storedf): Likewise.
	(atomic_storedf_1): Likewise.
	Move all atomic patterns to end of file.

From-SVN: r231727

PR objc++/68932  - FAIL: obj-c++.dg/property/at-property-23.mm -fgnu-runtime
                   (internal compiler error)

cp/
	* decl.c (grokdeclarator): Avoid assuming ctype is non-null when
	checking the validity of a flexible array member.

testsuite/
	* obj-c++.dg/property/at-property-23.mm: Remove check for
	an error message.

From-SVN: r231726

we used to translate the just computed schedule tree into a union_map,
and then in the code generation it would be translated back to a schedule tree
just before generating AST code.

From-SVN: r231725

2015-12-16  Paolo Carlini  <paolo.carlini@oracle.com>

	* pt.c (comp_template_args): Remove.
	(comp_template_args_with_info): Rename to comp_template_args;
	not static.
	(add_pending_template): Adjust call.
	* cp-tree.h (comp_template_args): Add default arguments.

From-SVN: r231723

	* ipa-visibility.c (can_replace_by_local_alias): Make static,
	check ASM_OUTPUT_DEF.
	(can_replace_by_local_alias_in_vtable): Make static.
	(function_and_variable_visibility): Reformat overlong comment.

From-SVN: r231721

	* ree.c (add_removable_extension): Use reg_overlap_mentioned_p
	rather than testing hard register #s.

From-SVN: r231719

	* config/nvptx/nvptx.h (OUTGOING_STATIC_CHAIN_REGNUM): Remove.
	(REGISTER_NAMES): Adjust.
	* config/nvptx/nvptx.c (nvptx_pass_by_reference): Avoid long line.
	(nvptx_static_hain): Delete.
	(write_arg_mode): Don't emit initializer if argno < 0.
	(write_arg_type): Fix whitespace.
	(init_frame): Initialize reg to zero if frame is zero-sized.
	(nvptx_declare_function_name):  Use write_arg_type to emit chain
	decl.
	(nvptx_output_call_insn): Adjust static chain emission.
	(nvptx_goacc_reduction): Make static.
	(TARGET_STATIC_CHAIN): Don't override.

From-SVN: r231718

From-SVN: r231717

	PR c++/68309
	* pt.c (instantiate_decl): Revert earlier change.

From-SVN: r231714

	PR c++/63628
	* pt.c (tsubst_pack_expansion): Also make dummy decls if
	retrieve_local_specialization fails.

From-SVN: r231713

gcc/c-family/ChangeLog:
	* c-common.h (conflict_marker_get_final_tok_kind): New prototype.
	* c-lex.c (conflict_marker_get_final_tok_kind): New function.

gcc/c/ChangeLog:
	* c-parser.c (struct c_parser): Expand array "tokens_buf" from 2
	to 4.
	(c_parser_peek_nth_token): New function.
	(c_parser_peek_conflict_marker): New function.
	(c_parser_error): Detect conflict markers and report them as such.

gcc/cp/ChangeLog:
	* parser.c (cp_lexer_peek_conflict_marker): New function.
	(cp_parser_error): Detect conflict markers and report them as
	such.

gcc/testsuite/ChangeLog:
	* c-c++-common/conflict-markers-1.c: New testcase.
	* c-c++-common/conflict-markers-2.c: Likewise.
	* c-c++-common/conflict-markers-3.c: Likewise.
	* c-c++-common/conflict-markers-4.c: Likewise.
	* c-c++-common/conflict-markers-5.c: Likewise.
	* c-c++-common/conflict-markers-6.c: Likewise.
	* c-c++-common/conflict-markers-7.c: Likewise.
	* c-c++-common/conflict-markers-8.c: Likewise.
	* c-c++-common/conflict-markers-9.c: Likewise.
	* c-c++-common/conflict-markers-10.c: Likewise.
	* c-c++-common/conflict-markers-11.c: Likewise.
	* g++.dg/conflict-markers-1.C: Likewise.

From-SVN: r231712

From-SVN: r231710

gcc/c/ChangeLog:
	* c-parser.c (c_parser_postfix_expression): Use EXPR_LOC_OR_LOC
	to preserve range information for the primary expression
	in the call to c_parser_postfix_expression_after_primary.

gcc/testsuite/ChangeLog:
	* gcc.dg/cast-function-1.c (bar): Update column numbers.
	* gcc.dg/diagnostic-range-bad-called-object.c: New test case.

From-SVN: r231709

Removed the member variables which are only used in scop_get_dependence. Instead
only maintaining the overall dependence. Passes regtest and bootstrap.

gcc/ChangeLog:

2015-12-15  hiraditya  <hiraditya@msn.com>

        * graphite-dependences.c (scop_get_dependences): Use local pointers.
        * graphite-isl-ast-to-gimple.c(translate_isl_ast_to_gimple::scop_to_isl_ast):
          Use scop->dependence.
        * graphite-optimize-isl.c (optimize_isl): Same.
        * graphite-poly.c (new_scop): Remove initialization of removed members.
        (free_scop): Same.
        * graphite.h (struct scop): Remove individial dependence pointers and
        add a scop::dependence to contain all the dependence.

From-SVN: r231708

Passes bootstrap and regtest.

gcc/ChangeLog:

2015-12-15  hiraditya  <hiraditya@msn.com>

        * graphite-sese-to-poly.c (build_poly_sr): Use refs.

From-SVN: r231707

we check for a the isl compute timeout function added in isl 0.13.
That means GCC could still be configured with isl 0.13, 0.14, and 0.15.

	* config/isl.m4 (ISL_CHECK_VERSION): Check for
	isl_ctx_get_max_operations.
	* configure: Regenerate.

	gcc/
	* config.in: Regenerate.
	* configure: Regenerate.
	* configure.ac: Remove checks for functions that exist in isl 0.13 or
	later.
	* graphite-isl-ast-to-gimple.c: Remove #ifdefs and code for isl 0.12.
        * graphite-optimize-isl.c: Same.
	* graphite-poly.c: Same.
	* graphite-sese-to-poly.c: Same.
	* graphite.h: Add comment for isl 0.14.
	* toplev.c (print_version): Print isl version.

Co-Authored-By: Sebastian Pop <s.pop@samsung.com>

From-SVN: r231706

	* ipa-cp.c (ipa_get_indirect_edge_target_1): Use can_refer; do not
	speculate to impossible targets.
	* ipa-prop.c (try_make_edge_direct_virtual_call): Likewise.

From-SVN: r231705

gcc/c/ChangeLog:
	* c-parser.c (c_parser_static_assert_declaration_no_semi): Use the
	expression location, falling back on the first token location,
	rather than always using the latter.

gcc/testsuite/ChangeLog:
	* gcc.dg/diagnostic-range-static-assert.c: New test case.

From-SVN: r231704

Co-Authored-By: Sebastian Pop <s.pop@samsung.com>

From-SVN: r231703

	PR c/64637
	* c-typeck.c (c_process_expr_stmt): Use location of the expression if
	available.

	* gcc.dg/pr64637.c: New test.

From-SVN: r231700

From-SVN: r231699

	* config/aarch64/aarch64.c (aarch64_extend_bitfield_pattern_p):
	New function.
	(aarch64_rtx_costs, ZERO_EXTEND, SIGN_EXTEND cases): Use the above
	to handle extend+shift rtxes.

From-SVN: r231698