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.
@@ -5790,35 +5790,22 @@ expand_builtin_sync_lock_release (machine_mode mode, tree exp)
static enum memmodel
get_memmodel (tree exp)
{
- rtx op;
- unsigned HOST_WIDE_INT val;
- location_t loc
- = expansion_point_location_if_in_system_header (input_location);
-
/* If the parameter is not a constant, it's a run time value so we'll just
convert it to MEMMODEL_SEQ_CST to avoid annoying runtime checking. */
if (TREE_CODE (exp) != INTEGER_CST)
return MEMMODEL_SEQ_CST;
- op = expand_normal (exp);
+ rtx op = expand_normal (exp);
- val = INTVAL (op);
+ unsigned HOST_WIDE_INT val = INTVAL (op);
if (targetm.memmodel_check)
val = targetm.memmodel_check (val);
else if (val & ~MEMMODEL_MASK)
- {
- warning_at (loc, OPT_Winvalid_memory_model,
- "unknown architecture specifier in memory model to builtin");
- return MEMMODEL_SEQ_CST;
- }
+ return MEMMODEL_SEQ_CST;
/* Should never see a user explicit SYNC memodel model, so >= LAST works. */
if (memmodel_base (val) >= MEMMODEL_LAST)
- {
- warning_at (loc, OPT_Winvalid_memory_model,
- "invalid memory model argument to builtin");
- return MEMMODEL_SEQ_CST;
- }
+ return MEMMODEL_SEQ_CST;
/* Workaround for Bugzilla 59448. GCC doesn't track consume properly, so
be conservative and promote consume to acquire. */
@@ -5865,28 +5852,17 @@ expand_builtin_atomic_compare_exchange (machine_mode mode, tree exp,
{
rtx expect, desired, mem, oldval;
rtx_code_label *label;
- enum memmodel success, failure;
tree weak;
bool is_weak;
- location_t loc
- = expansion_point_location_if_in_system_header (input_location);
- success = get_memmodel (CALL_EXPR_ARG (exp, 4));
- failure = get_memmodel (CALL_EXPR_ARG (exp, 5));
+ memmodel success = get_memmodel (CALL_EXPR_ARG (exp, 4));
+ memmodel failure = get_memmodel (CALL_EXPR_ARG (exp, 5));
if (failure > success)
- {
- warning_at (loc, OPT_Winvalid_memory_model,
- "failure memory model cannot be stronger than success "
- "memory model for %<__atomic_compare_exchange%>");
- success = MEMMODEL_SEQ_CST;
- }
+ success = MEMMODEL_SEQ_CST;
if (is_mm_release (failure) || is_mm_acq_rel (failure))
{
- warning_at (loc, OPT_Winvalid_memory_model,
- "invalid failure memory model for "
- "%<__atomic_compare_exchange%>");
failure = MEMMODEL_SEQ_CST;
success = MEMMODEL_SEQ_CST;
}
@@ -5991,29 +5967,15 @@ expand_ifn_atomic_compare_exchange (gcall *call)
int size = tree_to_shwi (gimple_call_arg (call, 3)) & 255;
gcc_assert (size == 1 || size == 2 || size == 4 || size == 8 || size == 16);
machine_mode mode = int_mode_for_size (BITS_PER_UNIT * size, 0).require ();
- rtx expect, desired, mem, oldval, boolret;
- enum memmodel success, failure;
- tree lhs;
- bool is_weak;
- location_t loc
- = expansion_point_location_if_in_system_header (gimple_location (call));
- success = get_memmodel (gimple_call_arg (call, 4));
- failure = get_memmodel (gimple_call_arg (call, 5));
+ memmodel success = get_memmodel (gimple_call_arg (call, 4));
+ memmodel failure = get_memmodel (gimple_call_arg (call, 5));
if (failure > success)
- {
- warning_at (loc, OPT_Winvalid_memory_model,
- "failure memory model cannot be stronger than success "
- "memory model for %<__atomic_compare_exchange%>");
- success = MEMMODEL_SEQ_CST;
- }
+ success = MEMMODEL_SEQ_CST;
if (is_mm_release (failure) || is_mm_acq_rel (failure))
{
- warning_at (loc, OPT_Winvalid_memory_model,
- "invalid failure memory model for "
- "%<__atomic_compare_exchange%>");
failure = MEMMODEL_SEQ_CST;
success = MEMMODEL_SEQ_CST;
}
@@ -6025,15 +5987,15 @@ expand_ifn_atomic_compare_exchange (gcall *call)
}
/* Expand the operands. */
- mem = get_builtin_sync_mem (gimple_call_arg (call, 0), mode);
+ rtx mem = get_builtin_sync_mem (gimple_call_arg (call, 0), mode);
- expect = expand_expr_force_mode (gimple_call_arg (call, 1), mode);
- desired = expand_expr_force_mode (gimple_call_arg (call, 2), mode);
+ rtx expect = expand_expr_force_mode (gimple_call_arg (call, 1), mode);
+ rtx desired = expand_expr_force_mode (gimple_call_arg (call, 2), mode);
- is_weak = (tree_to_shwi (gimple_call_arg (call, 3)) & 256) != 0;
+ bool is_weak = (tree_to_shwi (gimple_call_arg (call, 3)) & 256) != 0;
- boolret = NULL;
- oldval = NULL;
+ rtx boolret = NULL;
+ rtx oldval = NULL;
if (!expand_atomic_compare_and_swap (&boolret, &oldval, mem, expect, desired,
is_weak, success, failure))
@@ -6042,7 +6004,7 @@ expand_ifn_atomic_compare_exchange (gcall *call)
return;
}
- lhs = gimple_call_lhs (call);
+ tree lhs = gimple_call_lhs (call);
if (lhs)
{
rtx target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
@@ -6061,24 +6023,15 @@ expand_ifn_atomic_compare_exchange (gcall *call)
static rtx
expand_builtin_atomic_load (machine_mode mode, tree exp, rtx target)
{
- rtx mem;
- enum memmodel model;
-
- model = get_memmodel (CALL_EXPR_ARG (exp, 1));
+ memmodel model = get_memmodel (CALL_EXPR_ARG (exp, 1));
if (is_mm_release (model) || is_mm_acq_rel (model))
- {
- location_t loc
- = expansion_point_location_if_in_system_header (input_location);
- warning_at (loc, OPT_Winvalid_memory_model,
- "invalid memory model for %<__atomic_load%>");
- model = MEMMODEL_SEQ_CST;
- }
+ model = MEMMODEL_SEQ_CST;
if (!flag_inline_atomics)
return NULL_RTX;
/* Expand the operand. */
- mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
+ rtx mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
return expand_atomic_load (target, mem, model);
}
@@ -6092,26 +6045,17 @@ expand_builtin_atomic_load (machine_mode mode, tree exp, rtx target)
static rtx
expand_builtin_atomic_store (machine_mode mode, tree exp)
{
- rtx mem, val;
- enum memmodel model;
-
- model = get_memmodel (CALL_EXPR_ARG (exp, 2));
+ memmodel model = get_memmodel (CALL_EXPR_ARG (exp, 2));
if (!(is_mm_relaxed (model) || is_mm_seq_cst (model)
|| is_mm_release (model)))
- {
- location_t loc
- = expansion_point_location_if_in_system_header (input_location);
- warning_at (loc, OPT_Winvalid_memory_model,
- "invalid memory model for %<__atomic_store%>");
- model = MEMMODEL_SEQ_CST;
- }
+ model = MEMMODEL_SEQ_CST;
if (!flag_inline_atomics)
return NULL_RTX;
/* Expand the operands. */
- mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
- val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 1), mode);
+ rtx mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
+ rtx val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 1), mode);
return expand_atomic_store (mem, val, model, false);
}
@@ -6282,29 +6226,19 @@ expand_ifn_atomic_bit_test_and (gcall *call)
static rtx
expand_builtin_atomic_clear (tree exp)
{
- machine_mode mode;
- rtx mem, ret;
- enum memmodel model;
-
- mode = int_mode_for_size (BOOL_TYPE_SIZE, 0).require ();
- mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
- model = get_memmodel (CALL_EXPR_ARG (exp, 1));
+ machine_mode mode = int_mode_for_size (BOOL_TYPE_SIZE, 0).require ();
+ rtx mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
+ memmodel model = get_memmodel (CALL_EXPR_ARG (exp, 1));
if (is_mm_consume (model) || is_mm_acquire (model) || is_mm_acq_rel (model))
- {
- location_t loc
- = expansion_point_location_if_in_system_header (input_location);
- warning_at (loc, OPT_Winvalid_memory_model,
- "invalid memory model for %<__atomic_store%>");
- model = MEMMODEL_SEQ_CST;
- }
+ model = MEMMODEL_SEQ_CST;
/* Try issuing an __atomic_store, and allow fallback to __sync_lock_release.
Failing that, a store is issued by __atomic_store. The only way this can
fail is if the bool type is larger than a word size. Unlikely, but
handle it anyway for completeness. Assume a single threaded model since
there is no atomic support in this case, and no barriers are required. */
- ret = expand_atomic_store (mem, const0_rtx, model, true);
+ rtx ret = expand_atomic_store (mem, const0_rtx, model, true);
if (!ret)
emit_move_insn (mem, const0_rtx);
return const0_rtx;
@@ -29,6 +29,7 @@
#include "gimple.h"
#include "tree-pass.h"
#include "builtins.h"
+#include "diagnostic.h"
#include "ssa.h"
#include "gimple-pretty-print.h"
#include "gimple-ssa-warn-access.h"
@@ -38,6 +39,8 @@
#include "gimple-fold.h"
#include "gimple-iterator.h"
#include "langhooks.h"
+#include "memmodel.h"
+#include "target.h"
#include "tree-dfa.h"
#include "tree-ssa.h"
#include "tree-cfg.h"
@@ -2103,6 +2106,8 @@ private:
void maybe_check_dealloc_call (gcall *);
void maybe_check_access_sizes (rdwr_map *, tree, tree, gimple *);
+ bool maybe_warn_memmodel (gimple *, tree, tree, const unsigned char *);
+ void check_atomic_memmodel (gimple *, tree, tree, const unsigned char *);
/* A pointer_query object and its cache to store information about
pointers and their targets in. */
@@ -2686,6 +2691,237 @@ pass_waccess::check_read_access (gimple *stmt, tree src,
&data, m_ptr_qry.rvals);
}
+/* Return true if memory model ORD is constant in the context of STMT and
+ set *CSTVAL to the constant value. Otherwise return false. Warn for
+ invalid ORD. */
+
+bool
+memmodel_to_uhwi (tree ord, gimple *stmt, unsigned HOST_WIDE_INT *cstval)
+{
+ unsigned HOST_WIDE_INT val;
+
+ if (TREE_CODE (ord) == INTEGER_CST)
+ {
+ if (!tree_fits_uhwi_p (ord))
+ return false;
+ val = tree_to_uhwi (ord);
+ }
+ else
+ {
+ /* Use the range query to determine constant values in the absence
+ of constant proppagation (such as at -O0). */
+ value_range rng;
+ if (!get_range_query (cfun)->range_of_expr (rng, ord, stmt)
+ || !rng.constant_p ()
+ || !rng.singleton_p (&ord))
+ return false;
+
+ wide_int lob = rng.lower_bound ();
+ if (!wi::fits_uhwi_p (lob))
+ return false;
+
+ val = lob.to_shwi ();
+ }
+
+ if (targetm.memmodel_check)
+ /* This might warn for an invalid VAL but return a conservatively
+ valid result. */
+ val = targetm.memmodel_check (val);
+ else if (val & ~MEMMODEL_MASK)
+ {
+ tree fndecl = gimple_call_fndecl (stmt);
+ location_t loc = gimple_location (stmt);
+ loc = expansion_point_location_if_in_system_header (loc);
+
+ warning_at (loc, OPT_Winvalid_memory_model,
+ "unknown architecture specifier in memory model "
+ "%wi for %qD", val, fndecl);
+ return false;
+ }
+
+ *cstval = val;
+
+ return true;
+}
+
+/* Valid memory model for each set of atomic built-in functions. */
+
+struct memmodel_pair
+{
+ memmodel modval;
+ const char* modname;
+
+#define MEMMODEL_PAIR(val, str) \
+ { MEMMODEL_ ## val, "memory_order_" str }
+};
+
+/* Valid memory models in the order of increasing strength. */
+
+static const memmodel_pair memory_models[] =
+ { MEMMODEL_PAIR (RELAXED, "relaxed"),
+ MEMMODEL_PAIR (SEQ_CST, "seq_cst"),
+ MEMMODEL_PAIR (ACQUIRE, "acquire"),
+ MEMMODEL_PAIR (CONSUME, "consume"),
+ MEMMODEL_PAIR (RELEASE, "release"),
+ MEMMODEL_PAIR (ACQ_REL, "acq_rel")
+ };
+
+/* Return the name of the memory model VAL. */
+
+static const char*
+memmodel_name (unsigned HOST_WIDE_INT val)
+{
+ val = memmodel_base (val);
+
+ for (unsigned i = 0; i != sizeof memory_models / sizeof *memory_models; ++i)
+ {
+ if (val == memory_models[i].modval)
+ return memory_models[i].modname;
+ }
+ return NULL;
+}
+
+/* Indices of valid MEMORY_MODELS above for corresponding atomic operations. */
+static const unsigned char load_models[] = { 0, 1, 2, 3, UCHAR_MAX };
+static const unsigned char store_models[] = { 0, 1, 4, UCHAR_MAX };
+static const unsigned char xchg_models[] = { 0, 1, 3, 4, 5, UCHAR_MAX };
+static const unsigned char flag_clr_models[] = { 0, 1, 4, UCHAR_MAX };
+static const unsigned char all_models[] = { 0, 1, 2, 3, 4, 5, UCHAR_MAX };
+
+/* Check the success memory model argument ORD_SUCS to the call STMT to
+ an atomic function and warn if it's invalid. If nonnull, also check
+ the failure memory model ORD_FAIL and warn if it's invalid. Return
+ true if a warning has been issued. */
+
+bool
+pass_waccess::maybe_warn_memmodel (gimple *stmt, tree ord_sucs,
+ tree ord_fail, const unsigned char *valid)
+{
+ unsigned HOST_WIDE_INT sucs, fail = 0;
+ if (!memmodel_to_uhwi (ord_sucs, stmt, &sucs)
+ || (ord_fail && !memmodel_to_uhwi (ord_fail, stmt, &fail)))
+ return false;
+
+ bool is_valid = false;
+ if (valid)
+ for (unsigned i = 0; valid[i] != UCHAR_MAX; ++i)
+ {
+ memmodel model = memory_models[valid[i]].modval;
+ if (memmodel_base (sucs) == model)
+ {
+ is_valid = true;
+ break;
+ }
+ }
+ else
+ is_valid = true;
+
+ tree fndecl = gimple_call_fndecl (stmt);
+ location_t loc = gimple_location (stmt);
+ loc = expansion_point_location_if_in_system_header (loc);
+
+ if (!is_valid)
+ {
+ bool warned = false;
+ if (const char *modname = memmodel_name (sucs))
+ warned = warning_at (loc, OPT_Winvalid_memory_model,
+ "invalid memory model %qs for %qD",
+ modname, fndecl);
+ else
+ warned = warning_at (loc, OPT_Winvalid_memory_model,
+ "invalid memory model %wi for %qD",
+ sucs, fndecl);
+
+ if (!warned)
+ return false;
+
+ /* Print a note with the valid memory models. */
+ pretty_printer pp;
+ pp_show_color (&pp) = pp_show_color (global_dc->printer);
+ for (unsigned i = 0; valid[i] != UCHAR_MAX; ++i)
+ {
+ const char *modname = memory_models[valid[i]].modname;
+ pp_printf (&pp, "%s%<%s%>", i ? ", " : "", modname);
+ }
+
+ inform (loc, "valid models are %s", pp_formatted_text (&pp));
+ return true;
+ }
+
+ if (!ord_fail)
+ return false;
+
+ if (fail == MEMMODEL_RELEASE || fail == MEMMODEL_ACQ_REL)
+ if (const char *failname = memmodel_name (fail))
+ {
+ /* If both memory model arguments are valid but their combination
+ is not, use their names in the warning. */
+ if (!warning_at (loc, OPT_Winvalid_memory_model,
+ "invalid failure memory model %qs for %qD",
+ failname, fndecl))
+ return false;
+
+ inform (loc,
+ "valid failure models are %qs, %qs, %qs, %qs",
+ "memory_order_relaxed", "memory_order_seq_cst",
+ "memory_order_acquire", "memory_order_consume");
+ return true;
+ }
+
+ if (memmodel_base (fail) <= memmodel_base (sucs))
+ return false;
+
+ if (const char *sucsname = memmodel_name (sucs))
+ if (const char *failname = memmodel_name (fail))
+ {
+ /* If both memory model arguments are valid but their combination
+ is not, use their names in the warning. */
+ if (!warning_at (loc, OPT_Winvalid_memory_model,
+ "failure memory model %qs cannot be stronger "
+ "than success memory model %qs for %qD",
+ failname, sucsname, fndecl))
+ return false;
+
+ /* Print a note with the valid failure memory models which are
+ those with a value less than or equal to the success mode. */
+ char buf[120];
+ *buf = '\0';
+ for (unsigned i = 0;
+ memory_models[i].modval <= memmodel_base (sucs); ++i)
+ {
+ if (*buf)
+ strcat (buf, ", ");
+
+ const char *modname = memory_models[valid[i]].modname;
+ sprintf (buf + strlen (buf), "'%s'", modname);
+ }
+
+ inform (loc, "valid models are %s", buf);
+ return true;
+ }
+
+ /* If either memory model argument value is invalid use the numerical
+ value of both in the message. */
+ return warning_at (loc, OPT_Winvalid_memory_model,
+ "failure memory model %wi cannot be stronger "
+ "than success memory model %wi for %qD",
+ fail, sucs, fndecl);
+}
+
+/* Wrapper for the above. */
+
+void
+pass_waccess::check_atomic_memmodel (gimple *stmt, tree ord_sucs,
+ tree ord_fail, const unsigned char *valid)
+{
+ if (warning_suppressed_p (stmt, OPT_Winvalid_memory_model))
+ return;
+
+ if (maybe_warn_memmodel (stmt, ord_sucs, ord_fail, valid))
+ return;
+
+ suppress_warning (stmt, OPT_Winvalid_memory_model);
+}
/* Check a call STMT to an atomic or sync built-in. */
@@ -2699,12 +2935,14 @@ pass_waccess::check_atomic_builtin (gcall *stmt)
/* The size in bytes of the access by the function, and the number
of the second argument to check (if any). */
unsigned bytes = 0, arg2 = UINT_MAX;
+ unsigned sucs_arg = UINT_MAX, fail_arg = UINT_MAX;
+ /* Points to the array of indices of valid memory models. */
+ const unsigned char *pvalid_models = NULL;
switch (DECL_FUNCTION_CODE (callee))
{
#define BUILTIN_ACCESS_SIZE_FNSPEC(N) \
- BUILT_IN_ATOMIC_LOAD_ ## N: \
- case BUILT_IN_SYNC_FETCH_AND_ADD_ ## N: \
+ BUILT_IN_SYNC_FETCH_AND_ADD_ ## N: \
case BUILT_IN_SYNC_FETCH_AND_SUB_ ## N: \
case BUILT_IN_SYNC_FETCH_AND_OR_ ## N: \
case BUILT_IN_SYNC_FETCH_AND_AND_ ## N: \
@@ -2720,8 +2958,16 @@ pass_waccess::check_atomic_builtin (gcall *stmt)
case BUILT_IN_SYNC_BOOL_COMPARE_AND_SWAP_ ## N: \
case BUILT_IN_SYNC_VAL_COMPARE_AND_SWAP_ ## N: \
case BUILT_IN_SYNC_LOCK_RELEASE_ ## N: \
- case BUILT_IN_ATOMIC_EXCHANGE_ ## N: \
+ bytes = N; \
+ break; \
+ case BUILT_IN_ATOMIC_LOAD_ ## N: \
+ pvalid_models = load_models; \
+ sucs_arg = 1; \
+ /* FALLTHROUGH */ \
case BUILT_IN_ATOMIC_STORE_ ## N: \
+ if (!pvalid_models) \
+ pvalid_models = store_models; \
+ /* FALLTHROUGH */ \
case BUILT_IN_ATOMIC_ADD_FETCH_ ## N: \
case BUILT_IN_ATOMIC_SUB_FETCH_ ## N: \
case BUILT_IN_ATOMIC_AND_FETCH_ ## N: \
@@ -2735,9 +2981,21 @@ pass_waccess::check_atomic_builtin (gcall *stmt)
case BUILT_IN_ATOMIC_FETCH_OR_ ## N: \
case BUILT_IN_ATOMIC_FETCH_XOR_ ## N: \
bytes = N; \
+ if (sucs_arg == UINT_MAX) \
+ sucs_arg = 2; \
+ if (!pvalid_models) \
+ pvalid_models = all_models; \
+ break; \
+ case BUILT_IN_ATOMIC_EXCHANGE_ ## N: \
+ bytes = N; \
+ sucs_arg = 3; \
+ pvalid_models = xchg_models; \
break; \
case BUILT_IN_ATOMIC_COMPARE_EXCHANGE_ ## N: \
bytes = N; \
+ sucs_arg = 4; \
+ fail_arg = 5; \
+ pvalid_models = all_models; \
arg2 = 1
case BUILTIN_ACCESS_SIZE_FNSPEC (1);
@@ -2751,10 +3009,28 @@ pass_waccess::check_atomic_builtin (gcall *stmt)
case BUILTIN_ACCESS_SIZE_FNSPEC (16);
break;
+ case BUILT_IN_ATOMIC_CLEAR:
+ sucs_arg = 1;
+ pvalid_models = flag_clr_models;
+ break;
+
default:
return false;
}
+ unsigned nargs = gimple_call_num_args (stmt);
+ if (sucs_arg < nargs)
+ {
+ tree ord_sucs = gimple_call_arg (stmt, sucs_arg);
+ tree ord_fail = NULL_TREE;
+ if (fail_arg < nargs)
+ ord_fail = gimple_call_arg (stmt, fail_arg);
+ check_atomic_memmodel (stmt, ord_sucs, ord_fail, pvalid_models);
+ }
+
+ if (!bytes)
+ return true;
+
tree size = build_int_cstu (sizetype, bytes);
tree dst = gimple_call_arg (stmt, 0);
check_memop_access (stmt, dst, NULL_TREE, size);
@@ -986,10 +986,11 @@ linemap_client_expand_location_to_spelling_point (location_t loc,
}
-/* If LOCATION is in a system header and if it is a virtual location for
- a token coming from the expansion of a macro, unwind it to the
- location of the expansion point of the macro. Otherwise, just return
- LOCATION.
+/* If LOCATION is in a system header and if it is a virtual location
+ for a token coming from the expansion of a macro, unwind it to
+ the location of the expansion point of the macro. If the expansion
+ point is also in a system header return the original LOCATION.
+ Otherwise, return the location of the expansion point.
This is used for instance when we want to emit diagnostics about a
token that may be located in a macro that is itself defined in a
@@ -1001,11 +1002,13 @@ linemap_client_expand_location_to_spelling_point (location_t loc,
location_t
expansion_point_location_if_in_system_header (location_t location)
{
- if (in_system_header_at (location))
- location = linemap_resolve_location (line_table, location,
- LRK_MACRO_EXPANSION_POINT,
- NULL);
- return location;
+ if (!in_system_header_at (location))
+ return location;
+
+ location_t xloc = linemap_resolve_location (line_table, location,
+ LRK_MACRO_EXPANSION_POINT,
+ NULL);
+ return in_system_header_at (xloc) ? location : xloc;
}
/* If LOCATION is a virtual location for a token coming from the expansion
new file mode 100644
@@ -0,0 +1,239 @@
+/* PR middle-end/99612 - Missing warning on incorrect memory order without
+ -Wsystem-headers
+ Verify that constants are propagated through calls to inline functions
+ even at -O0.
+ Also verify that the informational notes after each warning mention
+ the valid memore models for each function.
+ { dg-do compile }
+ { dg-options "-O0 -ftrack-macro-expansion=0" } */
+
+#if !__cplusplus
+# define bool _Bool
+#endif
+
+extern int ei;
+
+static __attribute__ ((always_inline)) inline
+int retval (int val)
+{
+ return val;
+}
+
+void test_load (int *pi)
+{
+ int relaxed = retval (__ATOMIC_RELAXED);
+ *pi++ = __atomic_load_n (&ei, relaxed);
+
+ int consume = retval (__ATOMIC_CONSUME);
+ *pi++ = __atomic_load_n (&ei, consume);
+
+ int acquire = retval (__ATOMIC_ACQUIRE);
+ *pi++ = __atomic_load_n (&ei, acquire);
+
+ int release = retval (__ATOMIC_RELEASE);
+ *pi++ = __atomic_load_n (&ei, release); // { dg-warning "invalid memory model 'memory_order_release'" }
+ // { dg-message "valid models are 'memory_order_relaxed', 'memory_order_seq_cst', 'memory_order_acquire', 'memory_order_consume'" "note" { target *-*-* } .-1 }
+
+ int acq_rel = retval (__ATOMIC_ACQ_REL);
+ *pi++ = __atomic_load_n (&ei, acq_rel); // { dg-warning "invalid memory model 'memory_order_acq_rel'" }
+
+ int seq_cst = retval (__ATOMIC_SEQ_CST);
+ *pi++ = __atomic_load_n (&ei, seq_cst);
+
+ /* Verify a nonconstant range. */
+ int r0_1 = *pi++;
+ if (r0_1 < 0 || 1 < r0_1)
+ r0_1 = 0;
+ *pi++ = __atomic_load_n (&ei, r0_1);
+
+ /* Verify an unbounded range. */
+ int unknown = *pi++;
+ *pi++ = __atomic_load_n (&ei, unknown);
+}
+
+
+void test_store (int *pi, int x)
+{
+ int relaxed = retval (__ATOMIC_RELAXED);
+ __atomic_store_n (pi++, x, relaxed);
+
+ int consume = retval (__ATOMIC_CONSUME);
+ __atomic_store_n (pi++, x, consume); // { dg-warning "invalid memory model 'memory_order_consume'" }
+ // { dg-message "valid models are 'memory_order_relaxed', 'memory_order_seq_cst', 'memory_order_release'" "note" { target *-*-* } .-1 }
+
+ int acquire = retval (__ATOMIC_ACQUIRE);
+ __atomic_store_n (pi++, x, acquire); // { dg-warning "invalid memory model 'memory_order_acquire'" }
+
+ int release = retval (__ATOMIC_RELEASE);
+ __atomic_store_n (pi++, x, release);
+
+ int acq_rel = retval (__ATOMIC_ACQ_REL);
+ __atomic_store_n (pi++, x, acq_rel); // { dg-warning "invalid memory model 'memory_order_acq_rel'" }
+
+ int seq_cst = retval (__ATOMIC_SEQ_CST);
+ __atomic_store_n (pi++, x, seq_cst);
+
+ int unknown = *pi++;
+ __atomic_store_n (pi++, x, unknown);
+}
+
+
+/* All memory models are valid. */
+
+void test_exchange (int *pi, int x)
+{
+ int relaxed = retval (__ATOMIC_RELAXED);
+ __atomic_exchange_n (pi++, x, relaxed);
+
+ int consume = retval (__ATOMIC_CONSUME);
+ __atomic_exchange_n (pi++, x, consume);
+
+ int acquire = retval (__ATOMIC_ACQUIRE);
+ __atomic_exchange_n (pi++, x, acquire);
+
+ int release = retval (__ATOMIC_RELEASE);
+ __atomic_exchange_n (pi++, x, release);
+
+ int acq_rel = retval (__ATOMIC_ACQ_REL);
+ __atomic_exchange_n (pi++, x, acq_rel);
+
+ int seq_cst = retval (__ATOMIC_SEQ_CST);
+ __atomic_exchange_n (pi++, x, seq_cst);
+
+ int unknown = *pi++;
+ __atomic_exchange_n (pi++, x, unknown);
+}
+
+
+void test_compare_exchange (int *pi, int *pj, bool weak)
+{
+#define cmpxchg(x, expect, desire, sucs_ord, fail_ord) \
+ __atomic_compare_exchange_n (x, expect, desire, weak, sucs_ord, fail_ord)
+
+ int relaxed = retval (__ATOMIC_RELAXED);
+ cmpxchg (&ei, pi++, *pj++, relaxed, relaxed);
+
+ int consume = retval (__ATOMIC_CONSUME);
+ cmpxchg (&ei, pi++, *pj++, relaxed, consume); // { dg-warning "failure memory model 'memory_order_consume' cannot be stronger than success memory model 'memory_order_relaxed'" }
+
+ int acquire = retval (__ATOMIC_ACQUIRE);
+ cmpxchg (&ei, pi++, *pj++, relaxed, acquire); // { dg-warning "failure memory model 'memory_order_acquire' cannot be stronger than success memory model 'memory_order_relaxed'" }
+
+ int release = retval (__ATOMIC_RELEASE);
+ cmpxchg (&ei, pi++, *pj++, relaxed, release); // { dg-warning "invalid failure memory model 'memory_order_release'" }
+
+ int acq_rel = retval (__ATOMIC_ACQ_REL);
+ cmpxchg (&ei, pi++, *pj++, relaxed, acq_rel); // { dg-warning "invalid failure memory model 'memory_order_acq_rel'" }
+
+ int seq_cst = retval (__ATOMIC_SEQ_CST);
+ cmpxchg (&ei, pi++, *pj++, relaxed, seq_cst); // { dg-warning "failure memory model 'memory_order_seq_cst' cannot be stronger than success memory model 'memory_order_relaxed'" }
+
+
+ cmpxchg (&ei, pi++, *pj++, consume, relaxed);
+ cmpxchg (&ei, pi++, *pj++, consume, consume);
+ cmpxchg (&ei, pi++, *pj++, consume, acquire); // { dg-warning "failure memory model 'memory_order_acquire' cannot be stronger than success memory model 'memory_order_consume'" }
+ cmpxchg (&ei, pi++, *pj++, consume, release); // { dg-warning "invalid failure memory model 'memory_order_release'" }
+ cmpxchg (&ei, pi++, *pj++, consume, acq_rel); // { dg-warning "invalid failure memory model 'memory_order_acq_rel'" }
+ cmpxchg (&ei, pi++, *pj++, consume, seq_cst); // { dg-warning "failure memory model 'memory_order_seq_cst' cannot be stronger than success memory model 'memory_order_consume'" }
+
+ cmpxchg (&ei, pi++, *pj++, acquire, relaxed);
+ cmpxchg (&ei, pi++, *pj++, acquire, consume);
+ cmpxchg (&ei, pi++, *pj++, acquire, acquire);
+ cmpxchg (&ei, pi++, *pj++, acquire, release); // { dg-warning "invalid failure memory model 'memory_order_release'" }
+ cmpxchg (&ei, pi++, *pj++, acquire, acq_rel); // { dg-warning "invalid failure memory model 'memory_order_acq_rel'" }
+ cmpxchg (&ei, pi++, *pj++, acquire, seq_cst); // { dg-warning "failure memory model 'memory_order_seq_cst' cannot be stronger than success memory model 'memory_order_acquire'" }
+
+ cmpxchg (&ei, pi++, *pj++, release, relaxed);
+ cmpxchg (&ei, pi++, *pj++, release, consume);
+ cmpxchg (&ei, pi++, *pj++, release, acquire);
+ cmpxchg (&ei, pi++, *pj++, release, release); // { dg-warning "invalid failure memory model 'memory_order_release'" }
+ cmpxchg (&ei, pi++, *pj++, release, acq_rel); // { dg-warning "invalid failure memory model 'memory_order_acq_rel'" }
+ cmpxchg (&ei, pi++, *pj++, release, seq_cst); // { dg-warning "failure memory model 'memory_order_seq_cst' cannot be stronger than success memory model 'memory_order_release'" }
+
+ cmpxchg (&ei, pi++, *pj++, acq_rel, relaxed);
+ cmpxchg (&ei, pi++, *pj++, acq_rel, consume);
+ cmpxchg (&ei, pi++, *pj++, acq_rel, acquire);
+ cmpxchg (&ei, pi++, *pj++, acq_rel, release); // { dg-warning "invalid failure memory model 'memory_order_release'" }
+ cmpxchg (&ei, pi++, *pj++, acq_rel, acq_rel); // { dg-warning "invalid failure memory model 'memory_order_acq_rel'" }
+ cmpxchg (&ei, pi++, *pj++, acq_rel, seq_cst); // { dg-warning "failure memory model 'memory_order_seq_cst' cannot be stronger than success memory model 'memory_order_acq_rel'" }
+
+ cmpxchg (&ei, pi++, *pj++, seq_cst, relaxed);
+ cmpxchg (&ei, pi++, *pj++, seq_cst, consume);
+ cmpxchg (&ei, pi++, *pj++, seq_cst, acquire);
+ cmpxchg (&ei, pi++, *pj++, seq_cst, release); // { dg-warning "invalid failure memory model 'memory_order_release'" }
+ cmpxchg (&ei, pi++, *pj++, seq_cst, acq_rel); // { dg-warning "invalid failure memory model 'memory_order_acq_rel'" }
+ cmpxchg (&ei, pi++, *pj++, seq_cst, seq_cst);
+
+ int unknown = *pi++;
+ cmpxchg (&ei, pi++, *pj++, unknown, seq_cst);
+ cmpxchg (&ei, pi++, *pj++, relaxed, unknown);
+}
+
+
+/* All memory models are valid. */
+
+void test_add_fetch (unsigned *pi, unsigned x)
+{
+ int relaxed = retval (__ATOMIC_RELAXED);
+ __atomic_add_fetch (pi++, x, relaxed);
+
+ int consume = retval (__ATOMIC_CONSUME);
+ __atomic_add_fetch (pi++, x, consume);
+
+ int acquire = retval (__ATOMIC_ACQUIRE);
+ __atomic_add_fetch (pi++, x, acquire);
+
+ int release = retval (__ATOMIC_RELEASE);
+ __atomic_add_fetch (pi++, x, release);
+
+ int acq_rel = retval (__ATOMIC_ACQ_REL);
+ __atomic_add_fetch (pi++, x, acq_rel);
+
+ int seq_cst = retval (__ATOMIC_SEQ_CST);
+ __atomic_add_fetch (pi++, x, seq_cst);
+
+ int invalid;
+ if (x & 1)
+ {
+ invalid = retval (123);
+ __atomic_add_fetch (pi++, x, invalid); // { dg-warning "invalid memory model 123 for '\(unsigned int \)?__atomic_add_fetch" }
+ }
+ else
+ {
+ invalid = retval (456);
+ __atomic_add_fetch (pi++, x, invalid); // { dg-warning "invalid memory model 456 for '\(unsigned int \)?__atomic_add_fetch" }
+ }
+}
+
+void test_sub_fetch (unsigned *pi, unsigned x)
+{
+ int relaxed = retval (__ATOMIC_RELAXED);
+ __atomic_sub_fetch (pi++, x, relaxed);
+
+ int consume = retval (__ATOMIC_CONSUME);
+ __atomic_sub_fetch (pi++, x, consume);
+
+ int acquire = retval (__ATOMIC_ACQUIRE);
+ __atomic_sub_fetch (pi++, x, acquire);
+
+ int release = retval (__ATOMIC_RELEASE);
+ __atomic_sub_fetch (pi++, x, release);
+
+ int acq_rel = retval (__ATOMIC_ACQ_REL);
+ __atomic_sub_fetch (pi++, x, acq_rel);
+
+ int seq_cst = retval (__ATOMIC_SEQ_CST);
+ __atomic_sub_fetch (pi++, x, seq_cst);
+
+ int invalid;
+ if (x & 1)
+ {
+ invalid = retval (123);
+ __atomic_sub_fetch (pi++, x, invalid); // { dg-warning "invalid memory model 123 for '\(unsigned int \)?__atomic_sub_fetch" }
+ }
+ else
+ {
+ invalid = retval (456);
+ __atomic_sub_fetch (pi++, x, invalid); // { dg-warning "invalid memory model 456 for '\(unsigned int \)?__atomic_sub_fetch" }
+ }
+}
@@ -1,10 +1,13 @@
-/* PR c++/83059 */
+/* PR c++/83059 - ICE on invalid C++ code: in tree_to_uhwi, at tree.c:6633 */
/* { dg-do compile } */
void
foo (int *p, int *q, int *r)
{
__atomic_compare_exchange (p, q, r, 0, 0, -1); /* { dg-warning "invalid memory model argument 6" } */
- /* { dg-warning "unknown architecture specifi" "" { target *-*-* } .-1 } */
- /* { dg-warning "failure memory model cannot be stronger than success memory model" "" { target *-*-* } .-2 } */
}
+
+/* The test triggers several distinct instance of the warning. Prune
+ them out; they're not relevant to its main purpose -- to verify
+ there's no ICE.
+ { dg-prune-output "-Winvalid-memory-model" } */
new file mode 100644
@@ -0,0 +1,79 @@
+/* PR middle-end/99612 - Missing warning on incorrect memory order without
+ -Wsystem-headers
+ Verify warnings for atomic functions with optimization.
+ { dg-do compile { target c++11 } }
+ { dg-options "-O1" } */
+
+#include <atomic>
+
+static const std::memory_order relaxed = std::memory_order_relaxed;
+static const std::memory_order consume = std::memory_order_consume;
+static const std::memory_order acquire = std::memory_order_acquire;
+static const std::memory_order release = std::memory_order_release;
+static const std::memory_order acq_rel = std::memory_order_acq_rel;
+static const std::memory_order seq_cst = std::memory_order_seq_cst;
+
+extern std::atomic<int> eai;
+
+void test_load (int *pi)
+{
+ *pi++ = eai.load (relaxed);
+ *pi++ = eai.load (consume);
+ *pi++ = eai.load (acquire);
+ *pi++ = eai.load (release); // warning
+ *pi++ = eai.load (acq_rel); // warning
+ *pi++ = eai.load (seq_cst);
+}
+
+/* { dg-regexp " *inlined from \[^\n\r\]+.C:23:.*" "" { target *-*-* } 0 }
+ { dg-regexp " *inlined from \[^\n\r\]+.C:24:.*" "" { target *-*-* } 0 }
+ { dg-warning "__atomic_load\[^\n\r\]* \\\[-Winvalid-memory-model" "warning" { target *-*-* } 0 } */
+
+
+void test_store (int *pi)
+{
+ eai.store (*pi++, relaxed);
+ eai.store (*pi++, consume); // warning
+ eai.store (*pi++, acquire); // warning
+ eai.store (*pi++, release);
+ eai.store (*pi++, acq_rel); // warning
+ eai.store (*pi++, seq_cst);
+}
+
+/* { dg-regexp " *inlined from \[^\n\r\]+.C:36:.*" "" { target *-*-* } 0 }
+ { dg-regexp " *inlined from \[^\n\r\]+.C:37:.*" "" { target *-*-* } 0 }
+ { dg-regexp " *inlined from \[^\n\r\]+.C:39:.*" "" { target *-*-* } 0 }
+ { dg-warning "__atomic_store\[^\n\r]* \\\[-Winvalid-memory-model" "warning" { target *-*-* } 0 } */
+
+
+void test_exchange (const int *pi)
+{
+ eai.exchange (*pi++, relaxed);
+ eai.exchange (*pi++, consume);
+ eai.exchange (*pi++, acquire);
+ eai.exchange (*pi++, release);
+ eai.exchange (*pi++, acq_rel);
+ eai.exchange (*pi++, seq_cst);
+}
+
+
+void test_compare_exchange (int *pi, int *pj)
+{
+#define cmpxchg(x, y, z, o1, o2) \
+ std::atomic_compare_exchange_weak_explicit (x, y, z, o1, o2)
+
+ cmpxchg (&eai, pi++, *pj++, relaxed, relaxed);
+ cmpxchg (&eai, pi++, *pj++, relaxed, consume); // warning
+ cmpxchg (&eai, pi++, *pj++, relaxed, acquire); // warning
+ cmpxchg (&eai, pi++, *pj++, relaxed, release); // warning
+ cmpxchg (&eai, pi++, *pj++, relaxed, acq_rel); // warning
+ cmpxchg (&eai, pi++, *pj++, relaxed, seq_cst); // warning
+ cmpxchg (&eai, pi++, *pj++, relaxed, relaxed);
+
+ /* { dg-regexp " *inlined from \[^\n\r\]+.C:66:.*" "" { target *-*-* } 0 }
+ { dg-regexp " *inlined from \[^\n\r\]+.C:67:.*" "" { target *-*-* } 0 }
+ { dg-regexp " *inlined from \[^\n\r\]+.C:68:.*" "" { target *-*-* } 0 }
+ { dg-regexp " *inlined from \[^\n\r\]+.C:69:.*" "" { target *-*-* } 0 }
+ { dg-regexp " *inlined from \[^\n\r\]+.C:70:.*" "" { target *-*-* } 0 }
+ { dg-warning "__atomic_compare_exchange\[^\n\r\]* \\\[-Winvalid-memory-model" "cmpxchg 1" { target *-*-* } 0 } */
+}
new file mode 100644
@@ -0,0 +1,84 @@
+/* PR middle-end/99612 - Missing warning on incorrect memory order without
+ -Wsystem-headers
+ Verify warings for basic atomic functions with no optimization.
+ { dg-do compile { target c++11 } }
+ { dg-options "-O0 -Wall" } */
+
+#include <atomic>
+
+static const std::memory_order relaxed = std::memory_order_relaxed;
+static const std::memory_order consume = std::memory_order_consume;
+static const std::memory_order acquire = std::memory_order_acquire;
+static const std::memory_order release = std::memory_order_release;
+static const std::memory_order acq_rel = std::memory_order_acq_rel;
+static const std::memory_order seq_cst = std::memory_order_seq_cst;
+
+extern std::atomic<int> eai;
+
+void test_load (int *pi)
+{
+ *pi++ = eai.load (relaxed);
+ *pi++ = eai.load (consume);
+ *pi++ = eai.load (acquire);
+ *pi++ = eai.load (release); // warning
+ *pi++ = eai.load (acq_rel); // warning
+ *pi++ = eai.load (seq_cst);
+}
+
+/* { dg-regexp " *inlined from \[^\n\r\]+.C:23:.*" "" { target *-*-* } 0 }
+ { dg-regexp " *inlined from \[^\n\r\]+.C:24:.*" "" { target *-*-* } 0 }
+ { dg-warning "__atomic_load\[^\n\r\]* \\\[-Winvalid-memory-model" "warning" { target *-*-* } 0 } */
+
+
+void test_store (int *pi)
+{
+ eai.store (*pi++, relaxed);
+ eai.store (*pi++, consume); // warning
+ eai.store (*pi++, acquire); // warning
+ eai.store (*pi++, release);
+ eai.store (*pi++, acq_rel); // warning
+ eai.store (*pi++, seq_cst);
+}
+
+/* { dg-regexp " *inlined from \[^\n\r\]+.C:36:.*" "" { target *-*-* } 0 }
+ { dg-regexp " *inlined from \[^\n\r\]+.C:37:.*" "" { target *-*-* } 0 }
+ { dg-regexp " *inlined from \[^\n\r\]+.C:39:.*" "" { target *-*-* } 0 }
+ { dg-warning "__atomic_store\[^\n\r]* \\\[-Winvalid-memory-model" "warning" { target *-*-* } 0 } */
+
+
+void test_exchange (const int *pi)
+{
+ eai.exchange (*pi++, relaxed);
+ eai.exchange (*pi++, consume);
+ eai.exchange (*pi++, acquire);
+ eai.exchange (*pi++, release);
+ eai.exchange (*pi++, acq_rel);
+ eai.exchange (*pi++, seq_cst);
+}
+
+/* The following tests fail because std::atomic_compare_exchange_weak_explicit
+ is not declared with attribute always_inline (like the member functions
+ above are). */
+
+void test_compare_exchange (int *pi, int *pj)
+{
+#define cmpxchg(x, y, z, o1, o2) \
+ std::atomic_compare_exchange_weak_explicit (x, y, z, o1, o2)
+
+ cmpxchg (&eai, pi++, *pj++, relaxed, relaxed);
+ cmpxchg (&eai, pi++, *pj++, relaxed, consume); // warning
+ cmpxchg (&eai, pi++, *pj++, relaxed, acquire); // warning
+ cmpxchg (&eai, pi++, *pj++, relaxed, release); // warning
+ cmpxchg (&eai, pi++, *pj++, relaxed, acq_rel); // warning
+ cmpxchg (&eai, pi++, *pj++, relaxed, seq_cst); // warning
+ cmpxchg (&eai, pi++, *pj++, relaxed, relaxed);
+
+ /* HACK: xfail doesn't seem to work for the dg-regexp directives below,
+ so disable them by prepending an X to their names...
+ { Xdg-regexp " *inlined from \[^\n\r\]+.C:66:.*" "" { xfail *-*-* } 0 }
+ { Xdg-regexp " *inlined from \[^\n\r\]+.C:67:.*" "" { xfail *-*-* } 0 }
+ { Xdg-regexp " *inlined from \[^\n\r\]+.C:68:.*" "" { xfail *-*-* } 0 }
+ { Xdg-regexp " *inlined from \[^\n\r\]+.C:69:.*" "" { xfail *-*-* } 0 }
+ { Xdg-regexp " *inlined from \[^\n\r\]+.C:70:.*" "" { xfail *-*-* } 0 }
+ { dg-warning "__atomic_compare_exchange\[^\n\r\]* \\\[-Winvalid-memory-model" "cmpxchg 1" { xfail *-*-* } 0 } */
+}
@@ -38,13 +38,13 @@ exchange (atomic_int *i)
{
int r;
- atomic_compare_exchange_strong_explicit (i, &r, 0, memory_order_seq_cst, memory_order_release); /* { dg-warning "invalid failure memory" } */
- atomic_compare_exchange_strong_explicit (i, &r, 0, memory_order_seq_cst, memory_order_acq_rel); /* { dg-warning "invalid failure memory" } */
- atomic_compare_exchange_strong_explicit (i, &r, 0, memory_order_relaxed, memory_order_consume); /* { dg-warning "failure memory model cannot be stronger" } */
+ atomic_compare_exchange_strong_explicit (i, &r, 0, memory_order_seq_cst, memory_order_release); /* { dg-warning "invalid failure memory model 'memory_order_release'" } */
+ atomic_compare_exchange_strong_explicit (i, &r, 0, memory_order_seq_cst, memory_order_acq_rel); /* { dg-warning "invalid failure memory model 'memory_order_acq_rel'" } */
+ atomic_compare_exchange_strong_explicit (i, &r, 0, memory_order_relaxed, memory_order_consume); /* { dg-warning "failure memory model 'memory_order_consume' cannot be stronger than success memory model 'memory_order_relaxed'" } */
- atomic_compare_exchange_weak_explicit (i, &r, 0, memory_order_seq_cst, memory_order_release); /* { dg-warning "invalid failure memory" } */
- atomic_compare_exchange_weak_explicit (i, &r, 0, memory_order_seq_cst, memory_order_acq_rel); /* { dg-warning "invalid failure memory" } */
- atomic_compare_exchange_weak_explicit (i, &r, 0, memory_order_relaxed, memory_order_consume); /* { dg-warning "failure memory model cannot be stronger" } */
+ atomic_compare_exchange_weak_explicit (i, &r, 0, memory_order_seq_cst, memory_order_release); /* { dg-warning "invalid failure memory model 'memory_order_release'" } */
+ atomic_compare_exchange_weak_explicit (i, &r, 0, memory_order_seq_cst, memory_order_acq_rel); /* { dg-warning "invalid failure memory model 'memory_order_acq_rel'" } */
+ atomic_compare_exchange_weak_explicit (i, &r, 0, memory_order_relaxed, memory_order_consume); /* { dg-warning "failure memory model 'memory_order_consume' cannot be stronger than success memory model 'memory_order_relaxed'" } */
}
/* atomic_flag_clear():
@@ -13,7 +13,7 @@ bool x;
int
main ()
{
- __atomic_compare_exchange_n (&i, &e, 1, 0, __ATOMIC_RELAXED, __ATOMIC_SEQ_CST); /* { dg-warning "failure memory model cannot be stronger" } */
+ __atomic_compare_exchange_n (&i, &e, 1, 0, __ATOMIC_RELAXED, __ATOMIC_SEQ_CST); /* { dg-warning "failure memory model 'memory_order_seq_cst' cannot be stronger" } */
__atomic_compare_exchange_n (&i, &e, 1, 0, __ATOMIC_SEQ_CST, __ATOMIC_RELEASE); /* { dg-warning "invalid failure memory" } */
__atomic_compare_exchange_n (&i, &e, 1, 1, __ATOMIC_SEQ_CST, __ATOMIC_ACQ_REL); /* { dg-warning "invalid failure memory" } */
@@ -12409,9 +12409,7 @@ This built-in function implements an atomic exchange operation. It writes
@var{val} into @code{*@var{ptr}}, and returns the previous contents of
@code{*@var{ptr}}.
-The valid memory order variants are
-@code{__ATOMIC_RELAXED}, @code{__ATOMIC_SEQ_CST}, @code{__ATOMIC_ACQUIRE},
-@code{__ATOMIC_RELEASE}, and @code{__ATOMIC_ACQ_REL}.
+All memory order variants are valid.
@end deftypefn