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Handle GIMPLE_PHI and conditionals specially for dynamic objects,
returning PHI/conditional expressions instead of just a MIN/MAX
estimate.
This makes the returned object size variable for loops and conditionals,
so tests need to be adjusted to look for precise size in some cases.
builtin-dynamic-object-size-5.c had to be modified to only look for
success in maximum object size case and skip over the minimum object
size tests because the result is no longer a compile time constant.
I also added some simple tests to exercise conditionals with dynamic
object sizes.
gcc/ChangeLog:
PR middle-end/70090
* builtins.c (fold_builtin_object_size): Adjust for dynamic size
expressions.
* tree-object-size.c: Include gimplify-me.h.
(struct object_size_info): New member UNKNOWNS.
(size_initval_p, size_usable_p, object_sizes_get_raw): New
functions.
(object_sizes_get): Return suitable gimple variable for
object size.
(bundle_sizes): New function.
(object_sizes_set): Use it and handle dynamic object size
expressions.
(object_sizes_set_temp): New function.
(size_for_offset): Adjust for dynamic size expressions.
(emit_phi_nodes, propagate_unknowns, gimplify_size_expressions):
New functions.
(compute_builtin_object_size): Call gimplify_size_expressions
for OST_DYNAMIC.
(dynamic_object_size): New function.
(cond_expr_object_size): Use it.
(phi_dynamic_object_size): New function.
(collect_object_sizes_for): Call it for OST_DYNAMIC. Adjust to
accommodate dynamic object sizes.
gcc/testsuite/ChangeLog:
PR middle-end/70090
* gcc.dg/builtin-dynamic-object-size-0.c: New tests.
* gcc.dg/builtin-dynamic-object-size-10.c: Add comment.
* gcc.dg/builtin-dynamic-object-size-5-main.c: New file.
* gcc.dg/builtin-dynamic-object-size-5.c: Use it and change test
to dg-do run.
* gcc.dg/builtin-object-size-5.c [!N]: Define N.
(test1, test2, test3, test4) [__builtin_object_size]: Expect
exact result for __builtin_dynamic_object_size.
* gcc.dg/builtin-object-size-1.c [__builtin_object_size]: Expect
exact size expressions for __builtin_dynamic_object_size.
* gcc.dg/builtin-object-size-2.c [__builtin_object_size]:
Likewise.
* gcc.dg/builtin-object-size-3.c [__builtin_object_size]:
Likewise.
* gcc.dg/builtin-object-size-4.c [__builtin_object_size]:
Likewise.
Signed-off-by: Siddhesh Poyarekar <siddhesh@gotplt.org>
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Resolves:
PR middle-end/99612 - Remove "#pragma GCC system_header" from atomic file to warn on incorrect memory order
gcc/ChangeLog:
PR middle-end/99612
* builtins.c (get_memmodel): Move warning code to
gimple-ssa-warn-access.cc.
(expand_builtin_atomic_compare_exchange): Same.
(expand_ifn_atomic_compare_exchange): Same.
(expand_builtin_atomic_load): Same.
(expand_builtin_atomic_store): Same.
(expand_builtin_atomic_clear): Same.
* doc/extend.texi (__atomic_exchange_n): Update valid memory
models.
* gimple-ssa-warn-access.cc (memmodel_to_uhwi): New function.
(struct memmodel_pair): New struct.
(memmodel_name): New function.
(pass_waccess::maybe_warn_memmodel): New function.
(pass_waccess::check_atomic_memmodel): New function.
(pass_waccess::check_atomic_builtin): Handle memory model.
* input.c (expansion_point_location_if_in_system_header): Return
original location if expansion location is in a system header.
gcc/testsuite/ChangeLog:
PR middle-end/99612
* c-c++-common/pr83059.c: Adjust text of expected diagnostics.
* gcc.dg/atomic-invalid-2.c: Same.
* gcc.dg/atomic-invalid.c: Same.
* c-c++-common/Winvalid-memory-model.c: New test.
* g++.dg/warn/Winvalid-memory-model-2.C: New test.
* g++.dg/warn/Winvalid-memory-model.C: New test.
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{==,!=,<,<=,>,>=} 0 [PR98737]
On Wed, Jan 27, 2021 at 12:27:13PM +0100, Ulrich Drepper via Gcc-patches wrote:
> On 1/27/21 11:37 AM, Jakub Jelinek wrote:
> > Would equality comparison against 0 handle the most common cases.
> >
> > The user can write it as
> > __atomic_sub_fetch (x, y, z) == 0
> > or
> > __atomic_fetch_sub (x, y, z) - y == 0
> > thouch, so the expansion code would need to be able to cope with both.
>
> Please also keep !=0, <0, <=0, >0, and >=0 in mind. They all can be
> useful and can be handled with the flags.
<= 0 and > 0 don't really work well with lock {add,sub,inc,dec}, x86 doesn't
have comparisons that would look solely at both SF and ZF and not at other
flags (and emitting two separate conditional jumps or two setcc insns and
oring them together looks awful).
But the rest can work.
Here is a patch that adds internal functions and optabs for these,
recognizes them at the same spot as e.g. .ATOMIC_BIT_TEST_AND* internal
functions (fold all builtins pass) and expands them appropriately (or for
the <= 0 and > 0 cases of +/- FAILs and let's middle-end fall back).
So far I have handled just the op_fetch builtins, IMHO instead of handling
also __atomic_fetch_sub (x, y, z) - y == 0 etc. we should canonicalize
__atomic_fetch_sub (x, y, z) - y to __atomic_sub_fetch (x, y, z) (and vice
versa).
2022-01-03 Jakub Jelinek <jakub@redhat.com>
PR target/98737
* internal-fn.def (ATOMIC_ADD_FETCH_CMP_0, ATOMIC_SUB_FETCH_CMP_0,
ATOMIC_AND_FETCH_CMP_0, ATOMIC_OR_FETCH_CMP_0, ATOMIC_XOR_FETCH_CMP_0):
New internal fns.
* internal-fn.h (ATOMIC_OP_FETCH_CMP_0_EQ, ATOMIC_OP_FETCH_CMP_0_NE,
ATOMIC_OP_FETCH_CMP_0_LT, ATOMIC_OP_FETCH_CMP_0_LE,
ATOMIC_OP_FETCH_CMP_0_GT, ATOMIC_OP_FETCH_CMP_0_GE): New enumerators.
* internal-fn.c (expand_ATOMIC_ADD_FETCH_CMP_0,
expand_ATOMIC_SUB_FETCH_CMP_0, expand_ATOMIC_AND_FETCH_CMP_0,
expand_ATOMIC_OR_FETCH_CMP_0, expand_ATOMIC_XOR_FETCH_CMP_0): New
functions.
* optabs.def (atomic_add_fetch_cmp_0_optab,
atomic_sub_fetch_cmp_0_optab, atomic_and_fetch_cmp_0_optab,
atomic_or_fetch_cmp_0_optab, atomic_xor_fetch_cmp_0_optab): New
direct optabs.
* builtins.h (expand_ifn_atomic_op_fetch_cmp_0): Declare.
* builtins.c (expand_ifn_atomic_op_fetch_cmp_0): New function.
* tree-ssa-ccp.c: Include internal-fn.h.
(optimize_atomic_bit_test_and): Add . before internal fn call
in function comment. Change return type from void to bool and
return true only if successfully replaced.
(optimize_atomic_op_fetch_cmp_0): New function.
(pass_fold_builtins::execute): Use optimize_atomic_op_fetch_cmp_0
for BUILT_IN_ATOMIC_{ADD,SUB,AND,OR,XOR}_FETCH_{1,2,4,8,16} and
BUILT_IN_SYNC_{ADD,SUB,AND,OR,XOR}_AND_FETCH_{1,2,4,8,16},
for *XOR* ones only if optimize_atomic_bit_test_and failed.
* config/i386/sync.md (atomic_<plusminus_mnemonic>_fetch_cmp_0<mode>,
atomic_<logic>_fetch_cmp_0<mode>): New define_expand patterns.
(atomic_add_fetch_cmp_0<mode>_1, atomic_sub_fetch_cmp_0<mode>_1,
atomic_<logic>_fetch_cmp_0<mode>_1): New define_insn patterns.
* doc/md.texi (atomic_add_fetch_cmp_0<mode>,
atomic_sub_fetch_cmp_0<mode>, atomic_and_fetch_cmp_0<mode>,
atomic_or_fetch_cmp_0<mode>, atomic_xor_fetch_cmp_0<mode>): Document
new named patterns.
* gcc.target/i386/pr98737-1.c: New test.
* gcc.target/i386/pr98737-2.c: New test.
* gcc.target/i386/pr98737-3.c: New test.
* gcc.target/i386/pr98737-4.c: New test.
* gcc.target/i386/pr98737-5.c: New test.
* gcc.target/i386/pr98737-6.c: New test.
* gcc.target/i386/pr98737-7.c: New test.
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Recognize the __builtin_dynamic_object_size builtin and add paths in the
object size path to deal with it, but treat it like
__builtin_object_size for now. Also add tests to provide the same
testing coverage for the new builtin name.
gcc/ChangeLog:
* builtins.def (BUILT_IN_DYNAMIC_OBJECT_SIZE): New builtin.
* tree-object-size.h: Move object size type bits enum from
tree-object-size.c and add new value OST_DYNAMIC.
* builtins.c (expand_builtin, fold_builtin_2): Handle it.
(fold_builtin_object_size): Handle new builtin and adjust for
change to compute_builtin_object_size.
* tree-object-size.c: Include builtins.h.
(compute_builtin_object_size): Adjust.
(early_object_sizes_execute_one,
dynamic_object_sizes_execute_one): New functions.
(object_sizes_execute): Rename insert_min_max_p argument to
early. Handle BUILT_IN_DYNAMIC_OBJECT_SIZE and call the new
functions.
* doc/extend.texi (__builtin_dynamic_object_size): Document new
builtin.
gcc/testsuite/ChangeLog:
* g++.dg/ext/builtin-dynamic-object-size1.C: New test.
* g++.dg/ext/builtin-dynamic-object-size2.C: Likewise.
* gcc.dg/builtin-dynamic-alloc-size.c: Likewise.
* gcc.dg/builtin-dynamic-object-size-1.c: Likewise.
* gcc.dg/builtin-dynamic-object-size-10.c: Likewise.
* gcc.dg/builtin-dynamic-object-size-11.c: Likewise.
* gcc.dg/builtin-dynamic-object-size-12.c: Likewise.
* gcc.dg/builtin-dynamic-object-size-13.c: Likewise.
* gcc.dg/builtin-dynamic-object-size-14.c: Likewise.
* gcc.dg/builtin-dynamic-object-size-15.c: Likewise.
* gcc.dg/builtin-dynamic-object-size-16.c: Likewise.
* gcc.dg/builtin-dynamic-object-size-17.c: Likewise.
* gcc.dg/builtin-dynamic-object-size-18.c: Likewise.
* gcc.dg/builtin-dynamic-object-size-19.c: Likewise.
* gcc.dg/builtin-dynamic-object-size-2.c: Likewise.
* gcc.dg/builtin-dynamic-object-size-3.c: Likewise.
* gcc.dg/builtin-dynamic-object-size-4.c: Likewise.
* gcc.dg/builtin-dynamic-object-size-5.c: Likewise.
* gcc.dg/builtin-dynamic-object-size-6.c: Likewise.
* gcc.dg/builtin-dynamic-object-size-7.c: Likewise.
* gcc.dg/builtin-dynamic-object-size-8.c: Likewise.
* gcc.dg/builtin-dynamic-object-size-9.c: Likewise.
* gcc.dg/builtin-object-size-16.c: Adjust to allow inclusion
from builtin-dynamic-object-size-16.c.
* gcc.dg/builtin-object-size-17.c: Likewise.
Signed-off-by: Siddhesh Poyarekar <siddhesh@gotplt.org>
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Transform tree-object-size to operate on tree objects instead of host
wide integers. This makes it easier to extend to dynamic expressions
for object sizes.
The compute_builtin_object_size interface also now returns a tree
expression instead of HOST_WIDE_INT, so callers have been adjusted to
account for that.
The trees in object_sizes are each an object_size object with members
size (the bytes from the pointer to the end of the object) and wholesize
(the size of the whole object). This allows analysis of negative
offsets, which can now be allowed to the extent of the object bounds.
Tests have been added to verify that it actually works.
gcc/ChangeLog:
* tree-object-size.h (compute_builtin_object_size): Return tree
instead of HOST_WIDE_INT.
* builtins.c (fold_builtin_object_size): Adjust.
* gimple-fold.c (gimple_fold_builtin_strncat): Likewise.
* ubsan.c (instrument_object_size): Likewise.
* tree-object-size.c (object_size): New structure.
(object_sizes): Change type to vec<object_size>.
(initval): New function.
(unknown): Use it.
(size_unknown_p, size_initval, size_unknown): New functions.
(object_sizes_unknown_p): Use it.
(object_sizes_get): Return tree.
(object_sizes_initialize): Rename from object_sizes_set_force
and set VAL parameter type as tree. Add new parameter WHOLEVAL.
(object_sizes_set): Set VAL parameter type as tree and adjust
implementation. Add new parameter WHOLEVAL.
(size_for_offset): New function.
(decl_init_size): Adjust comment.
(addr_object_size): Change PSIZE parameter to tree and adjust
implementation. Add new parameter PWHOLESIZE.
(alloc_object_size): Return tree.
(compute_builtin_object_size): Return tree in PSIZE.
(expr_object_size, call_object_size, unknown_object_size):
Adjust for object_sizes_set change.
(merge_object_sizes): Drop OFFSET parameter and adjust
implementation for tree change.
(plus_stmt_object_size): Call collect_object_sizes_for directly
instead of merge_object_size and call size_for_offset to get net
size.
(cond_expr_object_size, collect_object_sizes_for,
object_sizes_execute): Adjust for change of type from
HOST_WIDE_INT to tree.
(check_for_plus_in_loops_1): Likewise and skip non-positive
offsets.
gcc/testsuite/ChangeLog:
* gcc.dg/builtin-object-size-1.c (test9): New test.
(main): Call it.
* gcc.dg/builtin-object-size-2.c (test8): New test.
(main): Call it.
* gcc.dg/builtin-object-size-3.c (test9): New test.
(main): Call it.
* gcc.dg/builtin-object-size-4.c (test8): New test.
(main): Call it.
* gcc.dg/builtin-object-size-5.c (test5, test6, test7): New
tests.
Signed-off-by: Siddhesh Poyarekar <siddhesh@gotplt.org>
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The conversion of a MEM address to ptr_mode in
try_store_by_multiple_pieces was misguided: copy_addr_to_reg expects
Pmode for addresses.
for gcc/ChangeLog
PR target/100518
* builtins.c (try_store_by_multiple_pieces): Drop address
conversion to ptr_mode.
for gcc/testsuite/ChangeLog
PR target/100518
* gcc.target/aarch64/pr100518.c: New.
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The testcase confuses the code that detects min and max len for the
memset, so max_len ends up less than min_len. That shouldn't be
possible, but the testcase requires us to handle this case.
The store-by-mult-pieces algorithm actually relies on min and max
lengths, so if we find them to be inconsistent, the best we can do is
punting.
for gcc/ChangeLog
PR middle-end/100843
* builtins.c (try_store_by_multiple_pieces): Fail if min_len
is greater than max_len.
for gcc/testsuite/ChangeLog
PR middle-end/100843
* gcc.dg/pr100843.c: New.
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This patch extends the reduction code to handle calls. So far
it's a structural change only; a later patch adds support for
specific function reductions.
Most of the patch consists of using code_helper and gimple_match_op
to describe the reduction operations. The other main change is that
vectorizable_call now needs to handle fully-predicated reductions.
There are some new functions that are provided for ABI completeness
and aren't currently used:
first_commutative_argument
commutative_ternary_op_p
1- and 3-argument forms of gimple_build
gcc/
* builtins.h (associated_internal_fn): Declare overload that
takes a (combined_cfn, return type) pair.
* builtins.c (associated_internal_fn): Split new overload out
of original fndecl version. Also provide an overload that takes
a (combined_cfn, return type) pair.
* internal-fn.h (commutative_binary_fn_p): Declare.
(commutative_ternary_fn_p): Likewise.
(associative_binary_fn_p): Likewise.
* internal-fn.c (commutative_binary_fn_p, commutative_ternary_fn_p):
New functions, split out from...
(first_commutative_argument): ...here.
(associative_binary_fn_p): New function.
* gimple-match.h (code_helper): Add a constructor that takes
internal functions.
(commutative_binary_op_p): Declare.
(commutative_ternary_op_p): Likewise.
(first_commutative_argument): Likewise.
(associative_binary_op_p): Likewise.
(canonicalize_code): Likewise.
(directly_supported_p): Likewise.
(get_conditional_internal_fn): Likewise.
(gimple_build): New overloads that takes a code_helper.
* gimple-fold.c (gimple_build): Likewise.
* gimple-match-head.c (commutative_binary_op_p): New function.
(commutative_ternary_op_p): Likewise.
(first_commutative_argument): Likewise.
(associative_binary_op_p): Likewise.
(canonicalize_code): Likewise.
(directly_supported_p): Likewise.
(get_conditional_internal_fn): Likewise.
* tree-vectorizer.h: Include gimple-match.h.
(neutral_op_for_reduction): Take a code_helper instead of a tree_code.
(needs_fold_left_reduction_p): Likewise.
(reduction_fn_for_scalar_code): Likewise.
(vect_can_vectorize_without_simd_p): Declare a nNew overload that takes
a code_helper.
* tree-vect-loop.c: Include case-cfn-macros.h.
(fold_left_reduction_fn): Take a code_helper instead of a tree_code.
(reduction_fn_for_scalar_code): Likewise.
(neutral_op_for_reduction): Likewise.
(needs_fold_left_reduction_p): Likewise.
(use_mask_by_cond_expr_p): Likewise.
(build_vect_cond_expr): Likewise.
(vect_create_partial_epilog): Likewise. Use gimple_build rather
than gimple_build_assign.
(check_reduction_path): Handle calls and operate on code_helpers
rather than tree_codes.
(vect_is_simple_reduction): Likewise.
(vect_model_reduction_cost): Likewise.
(vect_find_reusable_accumulator): Likewise.
(vect_create_epilog_for_reduction): Likewise.
(vect_transform_cycle_phi): Likewise.
(vectorizable_reduction): Likewise. Make more use of
lane_reduc_code_p.
(vect_transform_reduction): Use gimple_extract_op but expect
a tree_code for now.
(vect_can_vectorize_without_simd_p): New overload that takes
a code_helper.
* tree-vect-stmts.c (vectorizable_call): Handle reductions in
fully-masked loops.
* tree-vect-patterns.c (vect_mark_pattern_stmts): Use
gimple_extract_op when updating STMT_VINFO_REDUC_IDX.
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For nested functions we output call to builtin_dwarf_cfa which
initializes frame entry used only for debugging. This however
prevents us from detecting functions containing nested functions
as const/pure or analyze side effects in modref.
builtin_dwarf_cfa is not documented and I wonder if it should be turned to
internal function. But I think we could consider functions using it const even
if in theory one can do things like test the return address and see the
difference between different frame addreses.
While doing so I also noticed that special_buitin_state handles quite few
builtins that are not special cased by ipa-modref. They do not make
user visible loads/stores and thus I think they shoul dbe annotated by
".c" to make this explicit for both modref and PTA.
Finally I aded dwarf_cfa and similar return_address to list of simple
bulitins since it compiles to simple stack frame load (and we consider
simple other builtins doing so).
* builtins.c (is_simple_builtin): Add builitin_dwarf_cfa
and builtin_return_address.
(builtin_fnspec): Annotate builtin_return,
bulitin_eh_pointer, builtin_eh_filter, builtin_unwind_resume,
builtin_cxa_end_cleanup, builtin_eh_copy_values,
builtin_frame_address, builtin_apply_args,
builtin_asan_before_dynamic_init, builtin_asan_after_dynamic_init,
builtin_prefetch, builtin_dwarf_cfa, builtin_return_addrss
as ".c"
* ipa-pure-const.c (special_builtin_state): Add builtin_dwarf_cfa
and builtin_return_address.
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gcc/ChangeLog:
* builtins.c (check_strncat_sizes): Pass access_data ctor additional
arguments.
(expand_builtin_memcmp): Move code to gimple-ssa-warn-access.cc.
(expand_builtin_fork_or_exec): Same.
* gimple-array-bounds.cc (array_bounds_checker::check_mem_ref): Pass
compute_objsize additional arguments.
(inbounds_memaccess_p): Same.
(array_bounds_checker::check_array_bounds): Add an assert. Stash
statement in a member.
(check_array_bounds_dom_walker::before_dom_children): Same.
* gimple-array-bounds.h (array_bounds_checker::m_stmt): New member.
* gimple-ssa-sprintf.c (get_destination_size): Add an argument.
(handle_printf_call): Pass a new argument.
* gimple-ssa-warn-access.cc (get_size_range): Add an argument.
(check_access): Add an argument and pass it along to callees.
(check_read_access): Make a member function.
(pass_waccess::check_strcat): Pass access_data ctor additional
arguments.
(pass_waccess::check_strncat): Same.
(pass_waccess::check_stxcpy): Same.
(pass_waccess::check_stxncpy): Same.
(pass_waccess::check_strncmp): Same.
(pass_waccess::check_read_access): Same.
(pass_waccess::check_builtin): Same.
(pass_waccess::maybe_check_access_sizes): Same.
(pass_waccess::maybe_check_dealloc_call): Same.
* gimple-ssa-warn-access.h (check_read_access): Declare a new
member function.
* pointer-query.cc (compute_objsize_r): Add an argument.
(gimple_call_return_array): Same.
(gimple_call_alloc_size): Same.
(access_ref::access_ref): Same.
(access_ref::get_ref): Same.
(pointer_query::get_ref): Same.
(handle_min_max_size): Pass an arguments to callees.
(handle_array_ref): Add an argument.
(handle_mem_ref): Same.
(compute_objsize): Same.
* pointer-query.h (struct access_ref): Adjust signatures.
(struct access_data): Same.
(gimple_call_alloc_size): Add an argument.
(gimple_parm_array_size): Same.
(compute_objsize): Same.
* tree-ssa-strlen.c (strlen_pass::adjust_last_stmt): Pass an additional
argument to compute_objsize.
(strlen_pass::maybe_warn_overflow): Same.
(maybe_diag_stxncpy_trunc): Same.
gcc/testsuite/ChangeLog:
* gcc.dg/Wstringop-overflow-22.c: Correct typos.
* gcc.dg/Wstringop-overflow-81.c: New test.
libstdc++-v3/ChangeLog:
* testsuite/21_strings/basic_string/capacity/1.cc: Also suppress
-Wstringop-overread.
* testsuite/27_io/filesystem/path/factory/u8path-char8_t.cc: Same.
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This patch adds support for recognizing loops which mimic the behaviour
of functions strlen and rawmemchr, and replaces those with internal
function calls in case a target provides them. In contrast to the
standard strlen and rawmemchr functions, this patch also supports
different instances where the memory pointed to is interpreted as 8, 16,
and 32-bit sized, respectively.
gcc/ChangeLog:
* builtins.c (get_memory_rtx): Change to external linkage.
* builtins.h (get_memory_rtx): Add function prototype.
* doc/md.texi (rawmemchr<mode>): Document.
* internal-fn.c (expand_RAWMEMCHR): Define.
* internal-fn.def (RAWMEMCHR): Add.
* optabs.def (rawmemchr_optab): Add.
* tree-loop-distribution.c (find_single_drs): Change return code
behaviour by also returning true if no single store was found
but a single load.
(loop_distribution::classify_partition): Respect the new return
code behaviour of function find_single_drs.
(loop_distribution::execute): Call new function
transform_reduction_loop in order to replace rawmemchr or strlen
like loops by calls into builtins.
(generate_reduction_builtin_1): New function.
(generate_rawmemchr_builtin): New function.
(generate_strlen_builtin_1): New function.
(generate_strlen_builtin): New function.
(generate_strlen_builtin_using_rawmemchr): New function.
(reduction_var_overflows_first): New function.
(determine_reduction_stmt_1): New function.
(determine_reduction_stmt): New function.
(loop_distribution::transform_reduction_loop): New function.
gcc/testsuite/ChangeLog:
* gcc.dg/tree-ssa/ldist-rawmemchr-1.c: New test.
* gcc.dg/tree-ssa/ldist-rawmemchr-2.c: New test.
* gcc.dg/tree-ssa/ldist-strlen-1.c: New test.
* gcc.dg/tree-ssa/ldist-strlen-2.c: New test.
* gcc.dg/tree-ssa/ldist-strlen-3.c: New test.
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__builtin___clear_cache was able to accept constant address for the
argument, but it seems no longer accept recently, and it even not
accept constant address which is hold in variable when optimization is
enable:
```
void foo3(){
void *yy = (void*)0x1000;
__builtin___clear_cache(yy, yy);
}
```
So this patch make BEGIN and END accept VOIDmode, like cselib_lookup_mem did per
Jim Wilson's suggestion.
```
static cselib_val *
cselib_lookup_mem (rtx x, int create)
{
...
addr_mode = GET_MODE (XEXP (x, 0));
if (addr_mode == VOIDmode)
addr_mode = Pmode;
```
Changes v2 -> v3:
- Use gcc_assert rather than error, maybe_emit_call_builtin___clear_cache is
internal use only, and we already checked the type in other place.
Changes v1 -> v2:
- Check is CONST_INT intead of cehck mode, no new testcase, since
constant value with other type like CONST_DOUBLE will catched by
front-end.
e.g.
Code:
```c
void foo(){
__builtin___clear_cache(1.11, 0);
}
```
Error message:
```
clearcache-double.c: In function 'foo':
clearcache-double.c:2:27: error: incompatible type for argument 1 of '__builtin___clear_cache'
2 | __builtin___clear_cache(1.11, 0);
| ^~~~
| |
| double
clearcache-double.c:2:27: note: expected 'void *' but argument is of type 'double'
```
gcc/ChangeLog:
PR target/100316
* builtins.c (maybe_emit_call_builtin___clear_cache): Allow
CONST_INT for BEGIN and END, and use gcc_assert rather than
error.
gcc/testsuite/ChangeLog:
PR target/100316
* gcc.c-torture/compile/pr100316.c: New.
|
|
Initialize automatic variables with either a pattern or with zeroes to increase
the security and predictability of a program by preventing uninitialized memory
disclosure and use.
GCC still considers an automatic variable that doesn't have an explicit
initializer as uninitialized, -Wuninitialized will still report warning messages
on such automatic variables.
With this option, GCC will also initialize any padding of automatic variables
that have structure or union types to zeroes.
You can control this behavior for a specific variable by using the variable
attribute "uninitialized" to control runtime overhead.
gcc/ChangeLog:
2021-09-09 qing zhao <qing.zhao@oracle.com>
* builtins.c (expand_builtin_memset): Make external visible.
* builtins.h (expand_builtin_memset): Declare extern.
* common.opt (ftrivial-auto-var-init=): New option.
* doc/extend.texi: Document the uninitialized attribute.
* doc/invoke.texi: Document -ftrivial-auto-var-init.
* flag-types.h (enum auto_init_type): New enumerated type
auto_init_type.
* gimple-fold.c (clear_padding_type): Add one new parameter.
(clear_padding_union): Likewise.
(clear_padding_emit_loop): Likewise.
(clear_type_padding_in_mask): Likewise.
(gimple_fold_builtin_clear_padding): Handle this new parameter.
* gimplify.c (gimple_add_init_for_auto_var): New function.
(gimple_add_padding_init_for_auto_var): New function.
(is_var_need_auto_init): New function.
(gimplify_decl_expr): Add initialization to automatic variables per
users' requests.
(gimplify_call_expr): Add one new parameter for call to
__builtin_clear_padding.
(gimplify_init_constructor): Add padding initialization in the end.
* internal-fn.c (INIT_PATTERN_VALUE): New macro.
(expand_DEFERRED_INIT): New function.
* internal-fn.def (DEFERRED_INIT): New internal function.
* tree-cfg.c (verify_gimple_call): Verify calls to .DEFERRED_INIT.
* tree-sra.c (generate_subtree_deferred_init): New function.
(scan_function): Avoid setting cannot_scalarize_away_bitmap for
calls to .DEFERRED_INIT.
(sra_modify_deferred_init): New function.
(sra_modify_function_body): Handle calls to DEFERRED_INIT specially.
* tree-ssa-structalias.c (find_func_aliases_for_call): Likewise.
* tree-ssa-uninit.c (warn_uninit): Handle calls to DEFERRED_INIT
specially.
(check_defs): Likewise.
(warn_uninitialized_vars): Likewise.
* tree-ssa.c (ssa_undefined_value_p): Likewise.
* tree.c (build_common_builtin_nodes): Build tree node for
BUILT_IN_CLEAR_PADDING when needed.
gcc/c-family/ChangeLog:
2021-09-09 qing zhao <qing.zhao@oracle.com>
* c-attribs.c (handle_uninitialized_attribute): New function.
(c_common_attribute_table): Add "uninitialized" attribute.
gcc/testsuite/ChangeLog:
2021-09-09 qing zhao <qing.zhao@oracle.com>
* c-c++-common/auto-init-1.c: New test.
* c-c++-common/auto-init-10.c: New test.
* c-c++-common/auto-init-11.c: New test.
* c-c++-common/auto-init-12.c: New test.
* c-c++-common/auto-init-13.c: New test.
* c-c++-common/auto-init-14.c: New test.
* c-c++-common/auto-init-15.c: New test.
* c-c++-common/auto-init-16.c: New test.
* c-c++-common/auto-init-2.c: New test.
* c-c++-common/auto-init-3.c: New test.
* c-c++-common/auto-init-4.c: New test.
* c-c++-common/auto-init-5.c: New test.
* c-c++-common/auto-init-6.c: New test.
* c-c++-common/auto-init-7.c: New test.
* c-c++-common/auto-init-8.c: New test.
* c-c++-common/auto-init-9.c: New test.
* c-c++-common/auto-init-esra.c: New test.
* c-c++-common/auto-init-padding-1.c: New test.
* c-c++-common/auto-init-padding-2.c: New test.
* c-c++-common/auto-init-padding-3.c: New test.
* g++.dg/auto-init-uninit-pred-1_a.C: New test.
* g++.dg/auto-init-uninit-pred-2_a.C: New test.
* g++.dg/auto-init-uninit-pred-3_a.C: New test.
* g++.dg/auto-init-uninit-pred-4.C: New test.
* gcc.dg/auto-init-sra-1.c: New test.
* gcc.dg/auto-init-sra-2.c: New test.
* gcc.dg/auto-init-uninit-1.c: New test.
* gcc.dg/auto-init-uninit-12.c: New test.
* gcc.dg/auto-init-uninit-13.c: New test.
* gcc.dg/auto-init-uninit-14.c: New test.
* gcc.dg/auto-init-uninit-15.c: New test.
* gcc.dg/auto-init-uninit-16.c: New test.
* gcc.dg/auto-init-uninit-17.c: New test.
* gcc.dg/auto-init-uninit-18.c: New test.
* gcc.dg/auto-init-uninit-19.c: New test.
* gcc.dg/auto-init-uninit-2.c: New test.
* gcc.dg/auto-init-uninit-20.c: New test.
* gcc.dg/auto-init-uninit-21.c: New test.
* gcc.dg/auto-init-uninit-22.c: New test.
* gcc.dg/auto-init-uninit-23.c: New test.
* gcc.dg/auto-init-uninit-24.c: New test.
* gcc.dg/auto-init-uninit-25.c: New test.
* gcc.dg/auto-init-uninit-26.c: New test.
* gcc.dg/auto-init-uninit-3.c: New test.
* gcc.dg/auto-init-uninit-34.c: New test.
* gcc.dg/auto-init-uninit-36.c: New test.
* gcc.dg/auto-init-uninit-37.c: New test.
* gcc.dg/auto-init-uninit-4.c: New test.
* gcc.dg/auto-init-uninit-5.c: New test.
* gcc.dg/auto-init-uninit-6.c: New test.
* gcc.dg/auto-init-uninit-8.c: New test.
* gcc.dg/auto-init-uninit-9.c: New test.
* gcc.dg/auto-init-uninit-A.c: New test.
* gcc.dg/auto-init-uninit-B.c: New test.
* gcc.dg/auto-init-uninit-C.c: New test.
* gcc.dg/auto-init-uninit-H.c: New test.
* gcc.dg/auto-init-uninit-I.c: New test.
* gcc.target/aarch64/auto-init-1.c: New test.
* gcc.target/aarch64/auto-init-2.c: New test.
* gcc.target/aarch64/auto-init-3.c: New test.
* gcc.target/aarch64/auto-init-4.c: New test.
* gcc.target/aarch64/auto-init-5.c: New test.
* gcc.target/aarch64/auto-init-6.c: New test.
* gcc.target/aarch64/auto-init-7.c: New test.
* gcc.target/aarch64/auto-init-8.c: New test.
* gcc.target/aarch64/auto-init-padding-1.c: New test.
* gcc.target/aarch64/auto-init-padding-10.c: New test.
* gcc.target/aarch64/auto-init-padding-11.c: New test.
* gcc.target/aarch64/auto-init-padding-12.c: New test.
* gcc.target/aarch64/auto-init-padding-2.c: New test.
* gcc.target/aarch64/auto-init-padding-3.c: New test.
* gcc.target/aarch64/auto-init-padding-4.c: New test.
* gcc.target/aarch64/auto-init-padding-5.c: New test.
* gcc.target/aarch64/auto-init-padding-6.c: New test.
* gcc.target/aarch64/auto-init-padding-7.c: New test.
* gcc.target/aarch64/auto-init-padding-8.c: New test.
* gcc.target/aarch64/auto-init-padding-9.c: New test.
* gcc.target/i386/auto-init-1.c: New test.
* gcc.target/i386/auto-init-2.c: New test.
* gcc.target/i386/auto-init-21.c: New test.
* gcc.target/i386/auto-init-22.c: New test.
* gcc.target/i386/auto-init-23.c: New test.
* gcc.target/i386/auto-init-24.c: New test.
* gcc.target/i386/auto-init-3.c: New test.
* gcc.target/i386/auto-init-4.c: New test.
* gcc.target/i386/auto-init-5.c: New test.
* gcc.target/i386/auto-init-6.c: New test.
* gcc.target/i386/auto-init-7.c: New test.
* gcc.target/i386/auto-init-8.c: New test.
* gcc.target/i386/auto-init-padding-1.c: New test.
* gcc.target/i386/auto-init-padding-10.c: New test.
* gcc.target/i386/auto-init-padding-11.c: New test.
* gcc.target/i386/auto-init-padding-12.c: New test.
* gcc.target/i386/auto-init-padding-2.c: New test.
* gcc.target/i386/auto-init-padding-3.c: New test.
* gcc.target/i386/auto-init-padding-4.c: New test.
* gcc.target/i386/auto-init-padding-5.c: New test.
* gcc.target/i386/auto-init-padding-6.c: New test.
* gcc.target/i386/auto-init-padding-7.c: New test.
* gcc.target/i386/auto-init-padding-8.c: New test.
* gcc.target/i386/auto-init-padding-9.c: New test.
|
|
Also resolves:
PR middle-end/101854 - Invalid warning -Wstringop-overflow wrong argument
gcc/ChangeLog:
PR middle-end/101854
* builtins.c (expand_builtin_alloca): Move warning code to check_alloca
in gimple-ssa-warn-access.cc.
* calls.c (alloc_max_size): Move code to check_alloca.
(get_size_range): Move to pointer-query.cc.
(maybe_warn_alloc_args_overflow): Move to gimple-ssa-warn-access.cc.
(get_attr_nonstring_decl): Move to tree.c.
(fntype_argno_type): Move to gimple-ssa-warn-access.cc.
(append_attrname): Same.
(maybe_warn_rdwr_sizes): Same.
(initialize_argument_information): Move code to
gimple-ssa-warn-access.cc.
* calls.h (maybe_warn_alloc_args_overflow): Move to
gimple-ssa-warn-access.h.
(get_attr_nonstring_decl): Move to tree.h.
(maybe_warn_nonstring_arg): Move to gimple-ssa-warn-access.h.
(enum size_range_flags): Move to pointer-query.h.
(get_size_range): Same.
* gimple-ssa-warn-access.cc (has_location): Remove unused overload
to avoid Clang -Wunused-function.
(get_size_range): Declare static.
(maybe_emit_free_warning): Rename...
(maybe_check_dealloc_call): ...to this for consistency.
(class pass_waccess): Add members.
(pass_waccess::~pass_waccess): Defined.
(alloc_max_size): Move here from calls.c.
(maybe_warn_alloc_args_overflow): Same.
(check_alloca): New function.
(check_alloc_size_call): New function.
(check_strncat): Handle another warning flag.
(pass_waccess::check_builtin): Handle alloca.
(fntype_argno_type): Move here from calls.c.
(append_attrname): Same.
(maybe_warn_rdwr_sizes): Same.
(pass_waccess::check_call): Define.
(check_nonstring_args): New function.
(pass_waccess::check): Call new member functions.
(pass_waccess::execute): Enable ranger.
* gimple-ssa-warn-access.h (get_size_range): Move here from calls.h.
(maybe_warn_nonstring_arg): Same.
* gimple-ssa-warn-restrict.c: Remove #include.
* pointer-query.cc (get_size_range): Move here from calls.c.
* pointer-query.h (enum size_range_flags): Same.
(get_size_range): Same.
* tree.c (get_attr_nonstring_decl): Move here from calls.c.
* tree.h (get_attr_nonstring_decl): Move here from calls.h.
gcc/testsuite/ChangeLog:
* gcc.dg/attr-alloc_size-5.c: Adjust optimization to -O1.
* gcc.dg/attr-alloc_size-7.c: Use #pragmas to adjust optimization.
* gcc.dg/attr-alloc_size-8.c: Adjust optimization to -O1.
PR middle-end/101854
* gcc.dg/Wstringop-overflow-72.c: New test.
|
|
gcc/ChangeLog:
* builtins.c (expand_builtin_memchr): Move to gimple-ssa-warn-access.cc.
(expand_builtin_strcat): Same.
(expand_builtin_stpncpy): Same.
(expand_builtin_strncat): Same.
(check_read_access): Same.
(check_memop_access): Same.
(expand_builtin_strlen): Move checks to gimple-ssa-warn-access.cc.
(expand_builtin_strnlen): Same.
(expand_builtin_memcpy): Same.
(expand_builtin_memmove): Same.
(expand_builtin_mempcpy): Same.
(expand_builtin_strcpy): Same.
(expand_builtin_strcpy_args): Same.
(expand_builtin_stpcpy_1): Same.
(expand_builtin_strncpy): Same.
(expand_builtin_memset): Same.
(expand_builtin_bzero): Same.
(expand_builtin_strcmp): Same.
(expand_builtin_strncmp): Same.
(expand_builtin): Remove handlers.
(fold_builtin_strlen): Add a comment.
* builtins.h (check_access): Move to gimple-ssa-warn-access.cc.
* calls.c (maybe_warn_nonstring_arg): Same.
* diagnostic-spec.c (nowarn_spec_t::nowarn_spec_t): Add warning option.
* gimple-fold.c (gimple_fold_builtin_strcpy): Pass argument to callee.
(gimple_fold_builtin_stpcpy): Same.
* gimple-ssa-warn-access.cc (has_location): New function.
(get_location): Same.
(get_callee_fndecl): Same.
(call_nargs): Same.
(call_arg): Same.
(warn_string_no_nul): Define.
(unterminated_array): Same.
(check_nul_terminated_array): Same.
(maybe_warn_nonstring_arg): Same.
(maybe_warn_for_bound): Same.
(warn_for_access): Same.
(check_access): Same.
(check_memop_access): Same.
(check_read_access): Same.
(warn_dealloc_offset): Use helper functions.
(maybe_emit_free_warning): Same.
(class pass_waccess): Add members.
(check_strcat): New function.
(check_strncat): New function.
(check_stxcpy): New function.
(check_stxncpy): New function.
(check_strncmp): New function.
(pass_waccess::check_builtin): New function.
(pass_waccess::check): Call it.
* gimple-ssa-warn-access.h (warn_string_no_nul): Move here from
builtins.h.
(maybe_warn_for_bound): Same.
(check_access): Same.
(check_memop_access): Same.
(check_read_access): Same.
* pointer-query.h (struct access_data): Define a ctor overload.
gcc/testsuite/ChangeLog:
* c-c++-common/Wsizeof-pointer-memaccess1.c: Also disable
-Wstringop-overread.
* c-c++-common/attr-nonstring-3.c: Adjust pattern of expected message.
* gcc.dg/Warray-bounds-39.c: Add an xfail due to a known bug.
* gcc.dg/Wstring-compare-3.c: Also disable -Wstringop-overread.
* gcc.dg/attr-nonstring-2.c: Adjust pattern of expected message.
* gcc.dg/attr-nonstring-4.c: Same.
* gcc.dg/Wstringop-overread-6.c: New test.
* gcc.dg/sso-14.c: Fix typos to avoid buffer overflow.
|
|
1. Replace scalar_int_mode with fixed_size_mode in the by-pieces
infrastructure to allow non-integer mode.
2. Rename widest_int_mode_for_size to widest_fixed_size_mode_for_size
to return QI vector mode for memset.
3. Add op_by_pieces_d::smallest_fixed_size_mode_for_size to return the
smallest integer or QI vector mode.
4. Remove clear_by_pieces_1 and use builtin_memset_read_str in
clear_by_pieces to support vector mode broadcast.
5. Add lowpart_subreg_regno, a wrapper around simplify_subreg_regno that
uses subreg_lowpart_offset (mode, prev_mode) as the offset.
6. Add TARGET_GEN_MEMSET_SCRATCH_RTX to allow the backend to use a hard
scratch register to avoid stack realignment when expanding memset.
gcc/
PR middle-end/90773
* builtins.c (builtin_memcpy_read_str): Change the mode argument
from scalar_int_mode to fixed_size_mode.
(builtin_strncpy_read_str): Likewise.
(gen_memset_value_from_prev): New function.
(builtin_memset_read_str): Change the mode argument from
scalar_int_mode to fixed_size_mode. Use gen_memset_value_from_prev
and support CONST_VECTOR.
(builtin_memset_gen_str): Likewise.
(try_store_by_multiple_pieces): Use by_pieces_constfn to declare
constfun.
* builtins.h (builtin_strncpy_read_str): Replace scalar_int_mode
with fixed_size_mode.
(builtin_memset_read_str): Likewise.
* expr.c (widest_int_mode_for_size): Renamed to ...
(widest_fixed_size_mode_for_size): Add a bool argument to
indicate if QI vector mode can be used.
(by_pieces_ninsns): Call widest_fixed_size_mode_for_size
instead of widest_int_mode_for_size.
(pieces_addr::adjust): Change the mode argument from
scalar_int_mode to fixed_size_mode.
(op_by_pieces_d): Make m_len read-only. Add a bool member,
m_qi_vector_mode, to indicate that QI vector mode can be used.
(op_by_pieces_d::op_by_pieces_d): Add a bool argument to
initialize m_qi_vector_mode. Call widest_fixed_size_mode_for_size
instead of widest_int_mode_for_size.
(op_by_pieces_d::get_usable_mode): Change the mode argument from
scalar_int_mode to fixed_size_mode. Call
widest_fixed_size_mode_for_size instead of
widest_int_mode_for_size.
(op_by_pieces_d::smallest_fixed_size_mode_for_size): New member
function to return the smallest integer or QI vector mode.
(op_by_pieces_d::run): Call widest_fixed_size_mode_for_size
instead of widest_int_mode_for_size. Call
smallest_fixed_size_mode_for_size instead of
smallest_int_mode_for_size.
(store_by_pieces_d::store_by_pieces_d): Add a bool argument to
indicate that QI vector mode can be used and pass it to
op_by_pieces_d::op_by_pieces_d.
(can_store_by_pieces): Call widest_fixed_size_mode_for_size
instead of widest_int_mode_for_size. Pass memsetp to
widest_fixed_size_mode_for_size to support QI vector mode.
Allow all CONST_VECTORs for memset if vec_duplicate is supported.
(store_by_pieces): Pass memsetp to
store_by_pieces_d::store_by_pieces_d.
(clear_by_pieces_1): Removed.
(clear_by_pieces): Replace clear_by_pieces_1 with
builtin_memset_read_str and pass true to store_by_pieces_d to
support vector mode broadcast.
(string_cst_read_str): Change the mode argument from
scalar_int_mode to fixed_size_mode.
* expr.h (by_pieces_constfn): Change scalar_int_mode to
fixed_size_mode.
(by_pieces_prev): Likewise.
* rtl.h (lowpart_subreg_regno): New.
* rtlanal.c (lowpart_subreg_regno): New. A wrapper around
simplify_subreg_regno.
* target.def (gen_memset_scratch_rtx): New hook.
* doc/tm.texi.in: Add TARGET_GEN_MEMSET_SCRATCH_RTX.
* doc/tm.texi: Regenerated.
gcc/testsuite/
* gcc.target/i386/pr100865-3.c: Expect vmovdqu8 instead of
vmovdqu.
* gcc.target/i386/pr100865-4b.c: Likewise.
|
|
gcc/ChangeLog:
* Makefile.in (OBJS): Add gimple-ssa-warn-access.o and pointer-query.o.
* attribs.h (fndecl_dealloc_argno): Move fndecl_dealloc_argno to tree.h.
* builtins.c (compute_objsize_r): Move to pointer-query.cc.
(access_ref::access_ref): Same.
(access_ref::phi): Same.
(access_ref::get_ref): Same.
(access_ref::size_remaining): Same.
(access_ref::offset_in_range): Same.
(access_ref::add_offset): Same.
(access_ref::inform_access): Same.
(ssa_name_limit_t::visit_phi): Same.
(ssa_name_limit_t::leave_phi): Same.
(ssa_name_limit_t::next): Same.
(ssa_name_limit_t::next_phi): Same.
(ssa_name_limit_t::~ssa_name_limit_t): Same.
(pointer_query::pointer_query): Same.
(pointer_query::get_ref): Same.
(pointer_query::put_ref): Same.
(pointer_query::flush_cache): Same.
(warn_string_no_nul): Move to gimple-ssa-warn-access.cc.
(check_nul_terminated_array): Same.
(unterminated_array): Same.
(maybe_warn_for_bound): Same.
(check_read_access): Same.
(warn_for_access): Same.
(get_size_range): Same.
(check_access): Same.
(gimple_call_alloc_size): Move to tree.c.
(gimple_parm_array_size): Move to pointer-query.cc.
(get_offset_range): Same.
(gimple_call_return_array): Same.
(handle_min_max_size): Same.
(handle_array_ref): Same.
(handle_mem_ref): Same.
(compute_objsize): Same.
(gimple_call_alloc_p): Move to gimple-ssa-warn-access.cc.
(call_dealloc_argno): Same.
(fndecl_dealloc_argno): Same.
(new_delete_mismatch_p): Same.
(matching_alloc_calls_p): Same.
(warn_dealloc_offset): Same.
(maybe_emit_free_warning): Same.
* builtins.h (check_nul_terminated_array): Move to
gimple-ssa-warn-access.h.
(check_nul_terminated_array): Same.
(warn_string_no_nul): Same.
(unterminated_array): Same.
(class ssa_name_limit_t): Same.
(class pointer_query): Same.
(struct access_ref): Same.
(class range_query): Same.
(struct access_data): Same.
(gimple_call_alloc_size): Same.
(gimple_parm_array_size): Same.
(compute_objsize): Same.
(class access_data): Same.
(maybe_emit_free_warning): Same.
* calls.c (initialize_argument_information): Remove call to
maybe_emit_free_warning.
* gimple-array-bounds.cc: Include new header..
* gimple-fold.c: Same.
* gimple-ssa-sprintf.c: Same.
* gimple-ssa-warn-restrict.c: Same.
* passes.def: Add pass_warn_access.
* tree-pass.h (make_pass_warn_access): Declare.
* tree-ssa-strlen.c: Include new headers.
* tree.c (fndecl_dealloc_argno): Move here from builtins.c.
* tree.h (fndecl_dealloc_argno): Move here from attribs.h.
* gimple-ssa-warn-access.cc: New file.
* gimple-ssa-warn-access.h: New file.
* pointer-query.cc: New file.
* pointer-query.h: New file.
gcc/cp/ChangeLog:
* init.c: Include new header.
|
|
Resolves:
PR middle-end/101397 - spurious warning writing to the result of stpcpy minus 1
gcc/ChangeLog:
PR middle-end/101397
* builtins.c (gimple_call_return_array): Add argument. Correct
offsets for memchr, mempcpy, stpcpy, and stpncpy.
(compute_objsize_r): Adjust offset computation for argument returning
built-ins.
gcc/testsuite/ChangeLog:
PR middle-end/101397
* gcc.dg/Warray-bounds-80.c: New test.
* gcc.dg/Warray-bounds-81.c: New test.
* gcc.dg/Warray-bounds-82.c: New test.
* gcc.dg/Warray-bounds-83.c: New test.
* gcc.dg/Warray-bounds-84.c: New test.
* gcc.dg/Wstringop-overflow-46.c: Adjust expected output.
|
|
Resolves:
PR tree-optimization/100137 - -Warray-bounds false positive on varying offset plus negative
PR tree-optimization/99121 - ICE in -Warray-bounds on a multidimensional
PR tree-optimization/97027 - missing warning on buffer overflow storing a larger scalar into a smaller array
gcc/ChangeLog:
PR tree-optimization/100137
PR tree-optimization/99121
PR tree-optimization/97027
* builtins.c (access_ref::access_ref): Also set offmax.
(access_ref::offset_in_range): Define new function.
(access_ref::add_offset): Set offmax.
(access_ref::inform_access): Handle access_none.
(handle_mem_ref): Clear ostype.
(compute_objsize_r): Handle ASSERT_EXPR.
* builtins.h (struct access_ref): Add offmax member.
* gimple-array-bounds.cc (array_bounds_checker::check_mem_ref): Use
compute_objsize() and simplify.
gcc/testsuite/ChangeLog:
PR tree-optimization/100137
PR tree-optimization/99121
PR tree-optimization/97027
* c-c++-common/Warray-bounds-3.c: Remove xfail
* c-c++-common/Warray-bounds-4.c: Add an expected warning.
* c-c++-common/Warray-bounds-9.c: New test.
* c-c++-common/Warray-bounds-10.c: New test.
* g++.dg/asan/asan_test.C: Suppress expected warnings.
* g++.dg/pr95768.C: Same.
* g++.dg/warn/Warray-bounds-10.C: Adjust text of expected messages.
* g++.dg/warn/Warray-bounds-11.C: Same.
* g++.dg/warn/Warray-bounds-12.C: Same.
* g++.dg/warn/Warray-bounds-13.C: Same.
* g++.dg/warn/Warray-bounds-17.C: Same.
* g++.dg/warn/Warray-bounds-20.C: Same.
* gcc.dg/Warray-bounds-29.c: Same.
* gcc.dg/Warray-bounds-30.c: Add xfail.
* gcc.dg/Warray-bounds-31.c: Adjust text of expected messages.
* gcc.dg/Warray-bounds-32.c: Same.
* gcc.dg/Warray-bounds-52.c: Same.
* gcc.dg/Warray-bounds-53.c: Same.
* gcc.dg/Warray-bounds-58.c: Remove xfail.
* gcc.dg/Warray-bounds-63.c: Adjust text of expected messages.
* gcc.dg/Warray-bounds-66.c: Same.
* gcc.dg/Warray-bounds-69.c: Same.
* gcc.dg/Wstringop-overflow-34.c: Same.
* gcc.dg/Wstringop-overflow-47.c: Same.
* gcc.dg/Wstringop-overflow-61.c: Same.
* gcc.dg/Warray-bounds-77.c: New test.
* gcc.dg/Warray-bounds-78.c: New test.
* gcc.dg/Warray-bounds-79.c: New test.
|
|
Resolves:
PR middle-end/98871 - Cannot silence -Wmaybe-uninitialized at declaration site
PR middle-end/98512 - #pragma GCC diagnostic ignored ineffective in conjunction with alias attribute
gcc/ChangeLog:
* builtins.c (warn_string_no_nul): Remove %G.
(maybe_warn_for_bound): Same.
(warn_for_access): Same.
(check_access): Same.
(check_strncat_sizes): Same.
(expand_builtin_strncat): Same.
(expand_builtin_strncmp): Same.
(expand_builtin): Same.
(expand_builtin_object_size): Same.
(warn_dealloc_offset): Same.
(maybe_emit_free_warning): Same.
* calls.c (maybe_warn_alloc_args_overflow): Same.
(maybe_warn_nonstring_arg): Same.
(maybe_warn_rdwr_sizes): Same.
* expr.c (expand_expr_real_1): Remove %K.
* gimple-fold.c (gimple_fold_builtin_strncpy): Remove %G.
(gimple_fold_builtin_strncat): Same.
* gimple-ssa-sprintf.c (format_directive): Same.
(handle_printf_call): Same.
* gimple-ssa-warn-alloca.c (pass_walloca::execute): Same.
* gimple-ssa-warn-restrict.c (maybe_diag_overlap): Same.
(maybe_diag_access_bounds): Same. Call gimple_location.
(check_bounds_or_overlap): Same.
* trans-mem.c (ipa_tm_scan_irr_block): Remove %K. Simplify.
* tree-ssa-ccp.c (pass_post_ipa_warn::execute): Remove %G.
* tree-ssa-strlen.c (maybe_warn_overflow): Same.
(maybe_diag_stxncpy_trunc): Same.
(handle_builtin_stxncpy_strncat): Same.
(maybe_warn_pointless_strcmp): Same.
* tree-ssa-uninit.c (maybe_warn_operand): Same.
gcc/testsuite/ChangeLog:
* gcc.dg/Wobjsize-1.c: Prune expected output.
* gcc.dg/Warray-bounds-71.c: New test.
* gcc.dg/Warray-bounds-71.h: New test header.
* gcc.dg/Warray-bounds-72.c: New test.
* gcc.dg/Warray-bounds-73.c: New test.
* gcc.dg/Warray-bounds-74.c: New test.
* gcc.dg/Warray-bounds-75.c: New test.
* gcc.dg/Wfree-nonheap-object-4.c: Adjust expected output.
* gcc.dg/Wfree-nonheap-object-5.c: New test.
* gcc.dg/Wfree-nonheap-object-6.c: New test.
* gcc.dg/pragma-diag-10.c: New test.
* gcc.dg/pragma-diag-9.c: New test.
* gcc.dg/uninit-suppress_3.c: New test.
* gcc.dg/pr79214.c: Xfail tests.
* gcc.dg/tree-ssa/builtin-sprintf-warn-27.c: New test.
* gcc.dg/format/c90-printf-1.c: Adjust expected output.
|
|
gcc/ChangeLog:
* builtins.c (warn_string_no_nul): Replace uses of TREE_NO_WARNING,
gimple_no_warning_p and gimple_set_no_warning with
warning_suppressed_p, and suppress_warning.
(c_strlen): Same.
(maybe_warn_for_bound): Same.
(warn_for_access): Same.
(check_access): Same.
(expand_builtin_strncmp): Same.
(fold_builtin_varargs): Same.
* calls.c (maybe_warn_nonstring_arg): Same.
(maybe_warn_rdwr_sizes): Same.
* cfgexpand.c (expand_call_stmt): Same.
* cgraphunit.c (check_global_declaration): Same.
* fold-const.c (fold_undefer_overflow_warnings): Same.
(fold_truth_not_expr): Same.
(fold_unary_loc): Same.
(fold_checksum_tree): Same.
* gimple-array-bounds.cc (array_bounds_checker::check_array_ref): Same.
(array_bounds_checker::check_mem_ref): Same.
(array_bounds_checker::check_addr_expr): Same.
(array_bounds_checker::check_array_bounds): Same.
* gimple-expr.c (copy_var_decl): Same.
* gimple-fold.c (gimple_fold_builtin_strcpy): Same.
(gimple_fold_builtin_strncat): Same.
(gimple_fold_builtin_stxcpy_chk): Same.
(gimple_fold_builtin_stpcpy): Same.
(gimple_fold_builtin_sprintf): Same.
(fold_stmt_1): Same.
* gimple-ssa-isolate-paths.c (diag_returned_locals): Same.
* gimple-ssa-nonnull-compare.c (do_warn_nonnull_compare): Same.
* gimple-ssa-sprintf.c (handle_printf_call): Same.
* gimple-ssa-store-merging.c (imm_store_chain_info::output_merged_store): Same.
* gimple-ssa-warn-restrict.c (maybe_diag_overlap): Same.
* gimple-ssa-warn-restrict.h: Adjust declarations.
(maybe_diag_access_bounds): Replace uses of TREE_NO_WARNING,
gimple_no_warning_p and gimple_set_no_warning with
warning_suppressed_p, and suppress_warning.
(check_call): Same.
(check_bounds_or_overlap): Same.
* gimple.c (gimple_build_call_from_tree): Same.
* gimplify.c (gimplify_return_expr): Same.
(gimplify_cond_expr): Same.
(gimplify_modify_expr_complex_part): Same.
(gimplify_modify_expr): Same.
(gimple_push_cleanup): Same.
(gimplify_expr): Same.
* omp-expand.c (expand_omp_for_generic): Same.
(expand_omp_taskloop_for_outer): Same.
* omp-low.c (lower_rec_input_clauses): Same.
(lower_lastprivate_clauses): Same.
(lower_send_clauses): Same.
(lower_omp_target): Same.
* tree-cfg.c (pass_warn_function_return::execute): Same.
* tree-complex.c (create_one_component_var): Same.
* tree-inline.c (remap_gimple_op_r): Same.
(copy_tree_body_r): Same.
(declare_return_variable): Same.
(expand_call_inline): Same.
* tree-nested.c (lookup_field_for_decl): Same.
* tree-sra.c (create_access_replacement): Same.
(generate_subtree_copies): Same.
* tree-ssa-ccp.c (pass_post_ipa_warn::execute): Same.
* tree-ssa-forwprop.c (combine_cond_expr_cond): Same.
* tree-ssa-loop-ch.c (ch_base::copy_headers): Same.
* tree-ssa-loop-im.c (execute_sm): Same.
* tree-ssa-phiopt.c (cond_store_replacement): Same.
* tree-ssa-strlen.c (maybe_warn_overflow): Same.
(handle_builtin_strcpy): Same.
(maybe_diag_stxncpy_trunc): Same.
(handle_builtin_stxncpy_strncat): Same.
(handle_builtin_strcat): Same.
* tree-ssa-uninit.c (get_no_uninit_warning): Same.
(set_no_uninit_warning): Same.
(uninit_undefined_value_p): Same.
(warn_uninit): Same.
(maybe_warn_operand): Same.
* tree-vrp.c (compare_values_warnv): Same.
* vr-values.c (vr_values::extract_range_for_var_from_comparison_expr): Same.
(test_for_singularity): Same.
* gimple.h (warning_suppressed_p): New function.
(suppress_warning): Same.
(copy_no_warning): Same.
(gimple_set_block): Call gimple_set_location.
(gimple_set_location): Call copy_warning.
|
|
gcc/ChangeLog:
PR middle-end/100876
* builtins.c: (gimple_call_return_array): Account for size_t
mangling as either unsigned int or unsigned long
|
|
Resolves:
PR c++/100876 - -Wmismatched-new-delete should understand placement new when it's not inlined
gcc/ChangeLog:
PR c++/100876
* builtins.c (gimple_call_return_array): Check for attribute fn spec.
Handle calls to placement new.
(ndecl_dealloc_argno): Avoid placement delete.
gcc/testsuite/ChangeLog:
PR c++/100876
* g++.dg/warn/Wmismatched-new-delete-4.C: New test.
* g++.dg/warn/Wmismatched-new-delete-5.C: New test.
* g++.dg/warn/Wstringop-overflow-7.C: New test.
* g++.dg/warn/Wfree-nonheap-object-6.C: New test.
* g++.dg/analyzer/placement-new.C: Prune out expected warning.
|
|
This patch converts the remaining users of get_range_info and
get_ptr_nonnull to the get_range_query API.
No effort was made to move passes away from VR_ANTI_RANGE, or any other
use of deprecated methods. This was a straight up conversion to the new
API, nothing else.
gcc/ChangeLog:
* builtins.c (check_nul_terminated_array): Convert to get_range_query.
(expand_builtin_strnlen): Same.
(determine_block_size): Same.
* fold-const.c (expr_not_equal_to): Same.
* gimple-fold.c (size_must_be_zero_p): Same.
* gimple-match-head.c: Include gimple-range.h.
* gimple-pretty-print.c (dump_ssaname_info): Convert to get_range_query.
* gimple-ssa-warn-restrict.c
(builtin_memref::extend_offset_range): Same.
* graphite-sese-to-poly.c (add_param_constraints): Same.
* internal-fn.c (get_min_precision): Same.
* ipa-fnsummary.c (set_switch_stmt_execution_predicate): Same.
* ipa-prop.c (ipa_compute_jump_functions_for_edge): Same.
* match.pd: Same.
* tree-data-ref.c (split_constant_offset): Same.
(dr_step_indicator): Same.
* tree-dfa.c (get_ref_base_and_extent): Same.
* tree-scalar-evolution.c (iv_can_overflow_p): Same.
* tree-ssa-loop-niter.c (refine_value_range_using_guard): Same.
(determine_value_range): Same.
(record_nonwrapping_iv): Same.
(infer_loop_bounds_from_signedness): Same.
(scev_var_range_cant_overflow): Same.
* tree-ssa-phiopt.c (two_value_replacement): Same.
* tree-ssa-pre.c (insert_into_preds_of_block): Same.
* tree-ssa-reassoc.c (optimize_range_tests_to_bit_test): Same.
* tree-ssa-strlen.c (handle_builtin_stxncpy_strncat): Same.
(get_range): Same.
(dump_strlen_info): Same.
(set_strlen_range): Same.
(maybe_diag_stxncpy_trunc): Same.
(get_len_or_size): Same.
(handle_integral_assign): Same.
* tree-ssa-structalias.c (find_what_p_points_to): Same.
* tree-ssa-uninit.c (find_var_cmp_const): Same.
* tree-switch-conversion.c (bit_test_cluster::emit): Same.
* tree-vect-patterns.c (vect_get_range_info): Same.
(vect_recog_divmod_pattern): Same.
* tree-vrp.c (intersect_range_with_nonzero_bits): Same.
(register_edge_assert_for_2): Same.
(determine_value_range_1): Same.
* tree.c (get_range_pos_neg): Same.
* vr-values.c (vr_values::get_lattice_entry): Same.
(vr_values::update_value_range): Same.
(simplify_conversion_using_ranges): Same.
|
|
This enables the alias machinery for WITH_SIZE_EXPR which can appear
in call LHS and arguments. In particular this drops the NULL
return from get_base_address and it adjusts get_ref_base_and_extent
and friends to use the size information in WITH_SIZE_EXPR and
look through it for further processing.
2021-05-19 Richard Biener <rguenther@suse.de>
* builtins.c (get_object_alignment_1): Strip outer
WITH_SIZE_EXPR.
* tree-dfa.c (get_ref_base_and_extent): Handle outer
WITH_SIZE_EXPR for size processing and process the
containing ref.
* tree-ssa-alias.c (ao_ref_base_alias_set): Strip
outer WITH_SIZE_EXPR.
(ao_ref_base_alias_ptr_type): Likewise.
(refs_may_alias_p_2): Allow WITH_SIZE_EXPR in ref->ref
and handle that accordingly, stripping it for the
core alias workers.
* tree.c (get_base_address): Handle WITH_SIZE_EXPR by
looking through it instead of returning NULL.
|
|
For unprototyped builtins the checking we perform is only about whether
the used argument is integral, pointer etc., not the exact precision.
We emit a warning about the problem though:
pr100576.c: In function ‘foo’:
pr100576.c:9:11: warning: implicit declaration of function ‘memcmp’ [-Wimplicit-function-declaration]
9 | int n = memcmp (p, v, b);
| ^~~~~~
pr100576.c:1:1: note: include ‘<string.h>’ or provide a declaration of ‘memcmp’
+++ |+#include <string.h>
1 | /* PR middle-end/100576 */
pr100576.c:9:25: warning: ‘memcmp’ argument 3 type is ‘int’ where ‘long unsigned int’ is expected in a call to built-in function declared without prototype
+[-Wbuiltin-declaration-mismatch]
9 | int n = memcmp (p, v, b);
| ^
It means in the testcase below where the user incorrectly called memcmp
with last argument int rather then size_t, the warning stuff in builtins.c
ICEs because it compares a wide_int from such a bound with another wide_int
which has precision of size_t/sizetype and wide_int asserts the compared
wide_ints are compatible.
Fixed by forcing the bound to have the right type.
2021-05-19 Jakub Jelinek <jakub@redhat.com>
PR middle-end/100576
* builtins.c (check_read_access): Convert bound to size_type_node if
non-NULL.
* gcc.c-torture/compile/pr100576.c: New test.
|
|
gcc/ChangeLog:
PR middle-end/100574
* builtins.c (access_ref::get_ref): Improve detection of PHIs with
all null arguments.
|
|
gcc/ada/ChangeLog:
* gcc-interface/utils.c (def_builtin_1): Use startswith
function instead of strncmp.
gcc/analyzer/ChangeLog:
* sm-file.cc (is_file_using_fn_p): Use startswith
function instead of strncmp.
gcc/ChangeLog:
* builtins.c (is_builtin_name): Use startswith
function instead of strncmp.
* collect2.c (main): Likewise.
(has_lto_section): Likewise.
(scan_libraries): Likewise.
* coverage.c (coverage_checksum_string): Likewise.
(coverage_init): Likewise.
* dwarf2out.c (is_cxx): Likewise.
(gen_compile_unit_die): Likewise.
* gcc-ar.c (main): Likewise.
* gcc.c (init_spec): Likewise.
(read_specs): Likewise.
(execute): Likewise.
(check_live_switch): Likewise.
* genattrtab.c (write_attr_case): Likewise.
(IS_ATTR_GROUP): Likewise.
* gencfn-macros.c (main): Likewise.
* gengtype.c (type_for_name): Likewise.
(gen_rtx_next): Likewise.
(get_file_langdir): Likewise.
(write_local): Likewise.
* genmatch.c (get_operator): Likewise.
(get_operand_type): Likewise.
(expr::gen_transform): Likewise.
* genoutput.c (validate_optab_operands): Likewise.
* incpath.c (add_sysroot_to_chain): Likewise.
* langhooks.c (lang_GNU_C): Likewise.
(lang_GNU_CXX): Likewise.
(lang_GNU_Fortran): Likewise.
(lang_GNU_OBJC): Likewise.
* lto-wrapper.c (run_gcc): Likewise.
* omp-general.c (omp_max_simt_vf): Likewise.
* omp-low.c (omp_runtime_api_call): Likewise.
* opts-common.c (parse_options_from_collect_gcc_options): Likewise.
* read-rtl-function.c (function_reader::read_rtx_operand_r): Likewise.
* real.c (real_from_string): Likewise.
* selftest.c (assert_str_startswith): Likewise.
* timevar.c (timer::validate_phases): Likewise.
* tree.c (get_file_function_name): Likewise.
* ubsan.c (ubsan_use_new_style_p): Likewise.
* varasm.c (default_function_rodata_section): Likewise.
(incorporeal_function_p): Likewise.
(default_section_type_flags): Likewise.
* system.h (startswith): Define startswith.
gcc/c-family/ChangeLog:
* c-ada-spec.c (print_destructor): Use startswith
function instead of strncmp.
(dump_ada_declaration): Likewise.
* c-common.c (disable_builtin_function): Likewise.
(def_builtin_1): Likewise.
* c-format.c (check_tokens): Likewise.
(check_plain): Likewise.
(convert_format_name_to_system_name): Likewise.
gcc/c/ChangeLog:
* c-aux-info.c (affix_data_type): Use startswith
function instead of strncmp.
* c-typeck.c (build_function_call_vec): Likewise.
* gimple-parser.c (c_parser_gimple_parse_bb_spec): Likewise.
gcc/cp/ChangeLog:
* decl.c (duplicate_decls): Use startswith
function instead of strncmp.
(cxx_builtin_function): Likewise.
(omp_declare_variant_finalize_one): Likewise.
(grokfndecl): Likewise.
* error.c (dump_decl_name): Likewise.
* mangle.c (find_decomp_unqualified_name): Likewise.
(write_guarded_var_name): Likewise.
(decl_tls_wrapper_p): Likewise.
* parser.c (cp_parser_simple_type_specifier): Likewise.
(cp_parser_tx_qualifier_opt): Likewise.
* pt.c (template_parm_object_p): Likewise.
(dguide_name_p): Likewise.
gcc/d/ChangeLog:
* d-builtins.cc (do_build_builtin_fn): Use startswith
function instead of strncmp.
* dmd/dinterpret.c (evaluateIfBuiltin): Likewise.
* dmd/dmangle.c: Likewise.
* dmd/hdrgen.c: Likewise.
* dmd/identifier.c (Identifier::toHChars2): Likewise.
gcc/fortran/ChangeLog:
* decl.c (variable_decl): Use startswith
function instead of strncmp.
(gfc_match_end): Likewise.
* gfortran.h (gfc_str_startswith): Likewise.
* module.c (load_omp_udrs): Likewise.
(read_module): Likewise.
* options.c (gfc_handle_runtime_check_option): Likewise.
* primary.c (match_arg_list_function): Likewise.
* trans-decl.c (gfc_get_symbol_decl): Likewise.
* trans-expr.c (gfc_conv_procedure_call): Likewise.
* trans-intrinsic.c (gfc_conv_ieee_arithmetic_function): Likewise.
gcc/go/ChangeLog:
* gofrontend/runtime.cc (Runtime::name_to_code): Use startswith
function instead of strncmp.
gcc/objc/ChangeLog:
* objc-act.c (objc_string_ref_type_p): Use startswith
function instead of strncmp.
* objc-encoding.c (encode_type): Likewise.
* objc-next-runtime-abi-02.c (has_load_impl): Likewise.
|
|
Some architectures are fine with PLUS in move instructions, but others
are not (amdgcn is the motivating example).
2021-05-07 Jakub Jelinek <jakub@redhat.com>
Andrew Stubbs <amd@codesourcery.com>
gcc/ChangeLog:
PR target/100418
* builtins.c (try_store_by_multiple_pieces): Use force_operand for
emit_move_insn operands.
|
|
gcc/ChangeLog:
PR middle-end/100307
* builtins.c (compute_objsize_r): Clear base0 for pointers.
gcc/testsuite/ChangeLog:
PR middle-end/100307
* g++.dg/warn/Wplacement-new-size-9.C: New test.
* gcc.dg/tree-ssa/builtin-sprintf-warn-26.c: New test.
|
|
The test for the presence of variables (really symbols) does not work
when you add -Ox -flto to CFLAGS:
for v in $vars; do
AC_MSG_CHECKING([for $v])
AC_CACHE_VAL(libiberty_cv_var_$v,
[AC_LINK_IFELSE([AC_LANG_PROGRAM([[int *p;]],[[extern int $v [];
p = $v;]])],
[eval "libiberty_cv_var_$v=yes"],
[eval "libiberty_cv_var_$v=no"])])
if eval "test \"`echo '$libiberty_cv_var_'$v`\" = yes"; then
AC_MSG_RESULT(yes)
AC_DEFINE_UNQUOTED($n)
else
AC_MSG_RESULT(no)
fi
done
because the assignment to 'p' is optimized away by LTO. This is visible
on MinGW platforms in the form of a link failure for sys_siglist.
There is another link failures for stpcpy: the symbol is both referenced
by libiberty's pex-win32.c and provided by libiberty's stpcpy.c, so it
needs to have a linkage to be resolved in LTO mode.
libiberty/
* configure.ac: Make test for variables more robust.
* configure: Regenerate.
gcc/
* builtins.c (builtin_with_linkage_p): Return true for stp[n]cpy.
* symtab.c (symtab_node::output_to_lto_symbol_table_p): Tidy up.
|
|
gcc/ChangeLog:
2021-05-04 Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org>
* builtins.c (try_store_by_multiple_pieces): Fix constfun's prototype.
|
|
The ldist pass turns even very short loops into memset calls. E.g.,
the TFmode emulation calls end with a loop of up to 3 iterations, to
zero out trailing words, and the loop distribution pass turns them
into calls of the memset builtin.
Though short constant-length clearing memsets are usually dealt with
efficiently, for non-constant-length ones, the options are setmemM, or
a function calls.
RISC-V doesn't have any setmemM pattern, so the loops above end up
"optimized" into memset calls, incurring not only the overhead of an
explicit call, but also discarding the information the compiler has
about the alignment of the destination, and that the length is a
multiple of the word alignment.
This patch handles variable lengths with multiple conditional
power-of-2-constant-sized stores-by-pieces, so as to reduce the
overhead of length compares.
It also changes the last copy-prop pass into ccp, so that pointer
alignment and length's nonzero bits are detected and made available
for the expander, even for ldist-introduced SSA_NAMEs.
for gcc/ChangeLog
* builtins.c (try_store_by_multiple_pieces): New.
(expand_builtin_memset_args): Use it. If target_char_cast
fails, proceed as for non-constant val. Pass len's ctz to...
* expr.c (clear_storage_hints): ... this. Try store by
multiple pieces after setmem.
(clear_storage): Adjust.
* expr.h (clear_storage_hints): Likewise.
(try_store_by_multiple_pieces): Declare.
* passes.def: Replace the last copy_prop with ccp.
|
|
Check nullptr return from simplify_gen_subreg. Don't use it if it is
nullptr.
PR middle-end/90773
* builtins.c (builtin_memset_gen_str): Don't use return from
simplify_gen_subreg.
|
|
Add an overlap_op_by_pieces_p target hook for op_by_pieces operations
between two areas of memory to generate one offset adjusted operation
in the smallest integer mode for the remaining bytes on the last piece
operation of a memory region to avoid doing more than one smaller
operations.
Pass the RTL information from the previous iteration to m_constfn in
op_by_pieces operation so that builtin_memset_[read|gen]_str can
generate the new RTL from the previous RTL.
Tested on Linux/x86-64.
gcc/
PR middle-end/90773
* builtins.c (builtin_memcpy_read_str): Add a dummy argument.
(builtin_strncpy_read_str): Likewise.
(builtin_memset_read_str): Add an argument for the previous RTL
information and generate the new RTL from the previous RTL info.
(builtin_memset_gen_str): Likewise.
* builtins.h (builtin_strncpy_read_str): Update the prototype.
(builtin_memset_read_str): Likewise.
* expr.c (by_pieces_ninsns): If targetm.overlap_op_by_pieces_p()
returns true, round up size and alignment to the widest integer
mode for maximum size.
(pieces_addr::adjust): Add a pointer to by_pieces_prev argument
and pass it to m_constfn.
(op_by_pieces_d): Add m_push and m_overlap_op_by_pieces.
(op_by_pieces_d::op_by_pieces_d): Add a bool argument to
initialize m_push. Initialize m_overlap_op_by_pieces with
targetm.overlap_op_by_pieces_p ().
(op_by_pieces_d::run): Pass the previous RTL information to
pieces_addr::adjust and generate overlapping operations if
m_overlap_op_by_pieces is true.
(PUSHG_P): New.
(move_by_pieces_d::move_by_pieces_d): Updated for op_by_pieces_d
change.
(store_by_pieces_d::store_by_pieces_d): Updated for op_by_pieces_d
change.
(can_store_by_pieces): Use by_pieces_constfn on constfun.
(store_by_pieces): Use by_pieces_constfn on constfun. Updated
for op_by_pieces_d change.
(clear_by_pieces_1): Add a dummy argument.
(clear_by_pieces): Updated for op_by_pieces_d change.
(compare_by_pieces_d::compare_by_pieces_d): Likewise.
(string_cst_read_str): Add a dummy argument.
* expr.h (by_pieces_constfn): Add a dummy argument.
(by_pieces_prev): New.
* target.def (overlap_op_by_pieces_p): New target hook.
* config/i386/i386.c (TARGET_OVERLAP_OP_BY_PIECES_P): New.
* doc/tm.texi.in: Add TARGET_OVERLAP_OP_BY_PIECES_P.
* doc/tm.texi: Regenerated.
gcc/testsuite/
PR middle-end/90773
* g++.dg/pr90773-1.h: New test.
* g++.dg/pr90773-1a.C: Likewise.
* g++.dg/pr90773-1b.C: Likewise.
* g++.dg/pr90773-1c.C: Likewise.
* g++.dg/pr90773-1d.C: Likewise.
* gcc.target/i386/pr90773-1.c: Likewise.
* gcc.target/i386/pr90773-2.c: Likewise.
* gcc.target/i386/pr90773-3.c: Likewise.
* gcc.target/i386/pr90773-4.c: Likewise.
* gcc.target/i386/pr90773-5.c: Likewise.
* gcc.target/i386/pr90773-6.c: Likewise.
* gcc.target/i386/pr90773-7.c: Likewise.
* gcc.target/i386/pr90773-8.c: Likewise.
* gcc.target/i386/pr90773-9.c: Likewise.
* gcc.target/i386/pr90773-10.c: Likewise.
* gcc.target/i386/pr90773-11.c: Likewise.
* gcc.target/i386/pr90773-12.c: Likewise.
* gcc.target/i386/pr90773-13.c: Likewise.
* gcc.target/i386/pr90773-14.c: Likewise.
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PR testsuite/100159
PR testsuite/100192
gcc/ChangeLog:
* builtins.c (expand_builtin): Fix typos and missing comments.
* dwarf2out.c (gen_subprogram_die): Likewise.
(gen_struct_or_union_type_die): Likewise.
gcc/fortran/ChangeLog:
* frontend-passes.c (optimize_expr): Fix typos and missing comments.
gcc/testsuite/ChangeLog:
* g++.dg/template/nontype29.C: Fix typos and missing comments.
* gcc.dg/Warray-bounds-64.c: Likewise.
* gcc.dg/Warray-parameter.c: Likewise.
* gcc.dg/Wstring-compare.c: Likewise.
* gcc.dg/format/gcc_diag-11.c: Likewise.
* gfortran.dg/array_constructor_3.f90: Likewise.
* gfortran.dg/matmul_bounds_9.f90: Likewise.
* gfortran.dg/pr78033.f90: Likewise.
* gfortran.dg/pr96325.f90: Likewise.
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This patch fixes a regression introduced by the rtl-ssa patches.
It was seen on HPPA but it might be latent elsewhere.
The problem is that the traditional way of expanding an untyped_call
is to emit sequences like:
(call (mem (symbol_ref "foo")))
(set (reg pseudo1) (reg result1))
...
(set (reg pseudon) (reg resultn))
The ABI specifies that result1..resultn are clobbered by the call but
nothing in the RTL indicates that result1..resultn are the results
of the call. Normally, using a clobbered value gives undefined results,
but in this case the results are well-defined and matter for correctness.
This seems like a niche case, so I think it would be better to mark
it explicitly rather than try to detect it heuristically.
Note that in expand_builtin_apply we already have an rtx_insn *,
so it doesn't matter whether we call emit_call_insn or emit_insn.
Calling emit_insn seems more natural now that the gen_* call
has been split out. It also matches later code in the function.
gcc/
PR rtl-optimization/98689
* reg-notes.def (UNTYPED_CALL): New note.
* combine.c (distribute_notes): Handle it.
* emit-rtl.c (try_split): Likewise.
* rtlanal.c (rtx_properties::try_to_add_insn): Likewise. Assume
that calls with the note implicitly set all return value registers.
* builtins.c (expand_builtin_apply): Add a REG_UNTYPED_CALL
to untyped_calls.
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gcc/ChangeLog:
PR tree-optimization/99489
* builtins.c (gimple_call_alloc_size): Fail gracefully when argument
is not a call statement.
gcc/testsuite/ChangeLog:
PR tree-optimization/99489
* gcc.dg/Wstringop-truncation-9.c: New test.
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Resolves:
PR middle-end/96963 - -Wstringop-overflow false positive with -ftree-vectorize when assigning consecutive char struct members
PR middle-end/94655 - -Wstringop-overflow on implicit string assignment with vectorized char store
gcc/ChangeLog:
PR middle-end/96963
PR middle-end/94655
* builtins.c (handle_array_ref): New helper.
(handle_mem_ref): New helper.
(compute_objsize_r): Factor out ARRAY_REF and MEM_REF handling
into new helper functions. Correct a workaround for vectorized
assignments.
gcc/testsuite/ChangeLog:
PR middle-end/96963
PR middle-end/94655
* gcc.dg/Wstringop-overflow-47.c: Xfail tests.
* gcc.dg/Wstringop-overflow-65.c: New test.
* gcc.dg/Warray-bounds-69.c: Same.
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gcc/ChangeLog:
PR middle-end/99276
* builtins.c (warn_for_access): Remove stray warning text.
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This fixes a missing space as reported by translators.
2021-02-26 Richard Biener <rguenther@suse.de>
PR c/99275
* builtins.c (warn_string_no_nul): Fix diagnostic formatting.
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gcc/ChangeLog:
* builtins.c (warn_for_access): Fix typos.
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This avoids crashes with __builtin_next_arg on non-parameters. For
the specific testcase we arrive with an anonymous SSA_NAME so that
SSA_NAME_VAR becomes NULL and we crash.
2021-02-24 Richard Biener <rguenther@suse.de>
PR c/99224
* builtins.c (fold_builtin_next_arg): Avoid NULL arg.
* gcc.dg/pr99224.c: New testcase.
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The following patch fixes two bugs in the access_ref::inform_access function
(plus some formatting nits).
The first problem is that ref can be various things, e.g. *_DECL, or
SSA_NAME, or IDENTIFIER_NODE. And allocfn is non-NULL only if ref is
(at least originally) an SSA_NAME initialized to the result of some
allocator function (but not e.g. __builtin_alloca_with_align which is
handled differently).
A few lines above the last hunk of this patch in builtins.c, the code uses
if (mode == access_read_write || mode == access_write_only)
{
if (allocfn == NULL_TREE)
{
if (*offstr)
inform (loc, "at offset %s into destination object %qE of size %s",
offstr, ref, sizestr);
else
inform (loc, "destination object %qE of size %s", ref, sizestr);
return;
}
if (*offstr)
inform (loc,
"at offset %s into destination object of size %s "
"allocated by %qE", offstr, sizestr, allocfn);
else
inform (loc, "destination object of size %s allocated by %qE",
sizestr, allocfn);
return;
}
so if allocfn is NULL, it prints whatever ref is, if it is non-NULL,
it prints instead the allocation function. But strangely the hunk
a few lines below wasn't consistent with that and instead printed the
first form only if DECL_P (ref) and would ICE if ref wasn't a decl but
still allocfn was NULL. Fixed by making it consistent what the code does
earlier.
Another bug is that the code earlier contains an ugly hack for VLAs and was
assuming that SSA_NAME_IDENTIFIER must be non-NULL on the lhs of
__builtin_alloca_with_align. While that is likely true for the cases where
the compiler emits this builtin for VLAs (and it will also be true that
the name of the VLA in that case can be taken from that identifier up to the
first .), the builtin is user accessible as the testcase shows, so one can
have any other SSA_NAME in there. I think it would be better to add some
more reliable way how to identify VLA names corresponding to
__builtin_alloca_with_align allocations, perhaps internal fn or whatever,
but that is beyond the scope of this patch.
2021-01-20 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/98721
* builtins.c (access_ref::inform_access): Don't assume
SSA_NAME_IDENTIFIER must be non-NULL. Print messages about
object whenever allocfn is NULL, rather than only when DECL_P
is true. Use %qE instead of %qD for that. Formatting fixes.
* gcc.dg/pr98721-1.c: New test.
* gcc.dg/pr98721-2.c: New test.
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In dce6c58db87ebf7f4477bd3126228e73e4eeee97 msebor extended the
"malloc" attribute to support user-defined allocator/deallocator
pairs.
This patch extends the "malloc" checker within -fanalyzer to use
these attributes. It is based on an earlier patch:
'RFC: add "deallocated_by" attribute for use by analyzer'
https://gcc.gnu.org/pipermail/gcc-patches/2020-October/555544.html
which added a different attribute. The patch needed a lot of reworking
to support multiple deallocators per allocator.
My hope was that this would provide a minimal level of markup that would
support library-checking without requiring lots of further markup.
I attempted to use this to detect a memory leak within a Linux
driver (CVE-2019-19078), by adding the attribute to mark these fns:
extern struct urb *usb_alloc_urb(int iso_packets, gfp_t mem_flags);
extern void usb_free_urb(struct urb *urb);
where there is a leak of a "urb" on an error-handling path.
Unfortunately I ran into the problem that there are various other fns
that take "struct urb *" and the analyzer conservatively assumes that a
urb passed to them might or might not be freed and thus stops tracking
state for them.
Hence this will only detect issues for the simplest cases (without
adding another attribute).
gcc/analyzer/ChangeLog:
* analyzer.h (is_std_named_call_p): New decl.
* diagnostic-manager.cc (path_builder::get_sm): New.
(state_change_event_creator::state_change_event_creator): Add "pb"
param.
(state_change_event_creator::on_global_state_change): Don't consider
state changes affecting other state_machines.
(state_change_event_creator::on_state_change): Likewise.
(state_change_event_creator::m_pb): New field.
(diagnostic_manager::add_events_for_eedge): Pass pb to visitor
ctor.
* region-model-impl-calls.cc
(region_model::impl_deallocation_call): New.
* region-model.cc: Include "attribs.h".
(region_model::on_call_post): Handle fndecls referenced by
__attribute__((deallocated_by(FOO))).
* region-model.h (region_model::impl_deallocation_call): New decl.
* sm-malloc.cc: Include "stringpool.h" and "attribs.h". Add
leading comment.
(class api): Delete.
(enum resource_state): Update comment for change from api to
deallocator and deallocator_set.
(allocation_state::allocation_state): Drop api param. Add
"deallocators" and "deallocator".
(allocation_state::m_api): Drop field in favor of...
(allocation_state::m_deallocators): New field.
(allocation_state::m_deallocator): New field.
(enum wording): Add WORDING_DEALLOCATED.
(struct deallocator): New.
(struct standard_deallocator): New.
(struct custom_deallocator): New.
(struct deallocator_set): New.
(struct custom_deallocator_set): New.
(struct standard_deallocator_set): New.
(struct deallocator_set_map_traits): New.
(malloc_state_machine::m_malloc): Drop field
(malloc_state_machine::m_scalar_new): Likewise.
(malloc_state_machine::m_vector_new): Likewise.
(malloc_state_machine::m_free): New field
(malloc_state_machine::m_scalar_delete): Likewise.
(malloc_state_machine::m_vector_delete): Likewise.
(malloc_state_machine::deallocator_map_t): New typedef.
(malloc_state_machine::m_deallocator_map): New field.
(malloc_state_machine::deallocator_set_cache_t): New typedef.
(malloc_state_machine::m_custom_deallocator_set_cache): New field.
(malloc_state_machine::custom_deallocator_set_map_t): New typedef.
(malloc_state_machine::m_custom_deallocator_set_map): New field.
(malloc_state_machine::m_dynamic_sets): New field.
(malloc_state_machine::m_dynamic_deallocators): New field.
(api::api): Delete.
(deallocator::deallocator): New ctor.
(deallocator::hash): New.
(deallocator::dump_to_pp): New.
(deallocator::cmp): New.
(deallocator::cmp_ptr_ptr): New.
(standard_deallocator::standard_deallocator): New ctor.
(deallocator_set::deallocator_set): New ctor.
(deallocator_set::dump): New.
(custom_deallocator_set::custom_deallocator_set): New ctor.
(custom_deallocator_set::contains_p): New.
(custom_deallocator_set::maybe_get_single): New.
(custom_deallocator_set::dump_to_pp): New.
(standard_deallocator_set::standard_deallocator_set): New ctor.
(standard_deallocator_set::contains_p): New.
(standard_deallocator_set::maybe_get_single): New.
(standard_deallocator_set::dump_to_pp): New.
(start_p): New.
(class mismatching_deallocation): Update for conversion from api
to deallocator_set and deallocator.
(double_free::emit): Use %qs.
(class use_after_free): Update for conversion from api to
deallocator_set and deallocator.
(malloc_leak::describe_state_change): Only emit "allocated here" on
a start->nonnull transition, rather than on other transitions to
nonnull.
(allocation_state::dump_to_pp): Update for conversion from api to
deallocator_set.
(allocation_state::get_nonnull): Likewise.
(malloc_state_machine::malloc_state_machine): Likewise.
(malloc_state_machine::~malloc_state_machine): New.
(malloc_state_machine::add_state): Update for conversion from api
to deallocator_set.
(malloc_state_machine::get_or_create_custom_deallocator_set): New.
(malloc_state_machine::maybe_create_custom_deallocator_set): New.
(malloc_state_machine::get_or_create_deallocator): New.
(malloc_state_machine::on_stmt): Update for conversion from api
to deallocator_set. Handle "__attribute__((malloc(FOO)))", and
the special attribute set on FOO.
(malloc_state_machine::on_allocator_call): Update for conversion
from api to deallocator_set. Add "returns_nonnull" param and use
it to affect which state to transition to.
(malloc_state_machine::on_deallocator_call): Update for conversion
from api to deallocator_set.
gcc/ChangeLog:
* attribs.h (fndecl_dealloc_argno): New decl.
* builtins.c (call_dealloc_argno): Split out second half of
function into...
(fndecl_dealloc_argno): New.
* doc/extend.texi (Common Function Attributes): Document the
interaction between the analyzer and the malloc attribute.
* doc/invoke.texi (Static Analyzer Options): Likewise.
gcc/testsuite/ChangeLog:
* gcc.dg/analyzer/attr-malloc-1.c: New test.
* gcc.dg/analyzer/attr-malloc-2.c: New test.
* gcc.dg/analyzer/attr-malloc-4.c: New test.
* gcc.dg/analyzer/attr-malloc-5.c: New test.
* gcc.dg/analyzer/attr-malloc-6.c: New test.
* gcc.dg/analyzer/attr-malloc-CVE-2019-19078-usb-leak.c: New test.
* gcc.dg/analyzer/attr-malloc-misuses.c: New test.
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gcc/ChangeLog:
PR c++/98305
* builtins.c (new_delete_mismatch_p): New overload.
(new_delete_mismatch_p (tree, tree)): Call it.
gcc/testsuite/ChangeLog:
PR c++/98305
* g++.dg/warn/Wmismatched-new-delete-3.C: New test.
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delete
gcc/ChangeLog:
PR middle-end/98160
* builtins.c (warn_dealloc_offset): Avoid assuming calls are made
through declared functions and not pointers.
gcc/testsuite/ChangeLog:
PR middle-end/98160
* g++.dg/warn/pr98160.C: New test.
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gcc/ChangeLog:
PR c++/98413
* builtins.c (get_offset_range): Avoid non-integers/-pointers.
gcc/testsuite/ChangeLog:
PR c++/98413
* g++.dg/warn/pr98413.C: New test.
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