/* Header file for libgcov-*.c.
- Copyright (C) 1996-2019 Free Software Foundation, Inc.
+ Copyright (C) 1996-2021 Free Software Foundation, Inc.
This file is part of GCC.
#include "libgcc_tm.h"
#include "gcov.h"
+#if HAVE_SYS_MMAN_H
+#include <sys/mman.h>
+#endif
+
#if __CHAR_BIT__ == 8
typedef unsigned gcov_unsigned_t __attribute__ ((mode (SI)));
typedef unsigned gcov_position_t __attribute__ ((mode (SI)));
#define GCOV_LOCKED 0
#endif
+#ifndef GCOV_SUPPORTS_ATOMIC
+/* Detect whether target can support atomic update of profilers. */
+#if __SIZEOF_LONG_LONG__ == 4 && __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
+#define GCOV_SUPPORTS_ATOMIC 1
+#else
+#if __SIZEOF_LONG_LONG__ == 8 && __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8
+#define GCOV_SUPPORTS_ATOMIC 1
+#else
+#define GCOV_SUPPORTS_ATOMIC 0
+#endif
+#endif
+#endif
+
/* In libgcov we need these functions to be extern, so prefix them with
__gcov. In libgcov they must also be hidden so that the instance in
the executable is not also used in a DSO. */
#define L_gcov 1
#define L_gcov_merge_add 1
-#define L_gcov_merge_single 1
+#define L_gcov_merge_topn 1
#define L_gcov_merge_ior 1
#define L_gcov_merge_time_profile 1
/* Poison these, so they don't accidentally slip in. */
#pragma GCC poison gcov_write_string gcov_write_tag gcov_write_length
-#pragma GCC poison gcov_time gcov_magic
+#pragma GCC poison gcov_time
#ifdef HAVE_GAS_HIDDEN
#define ATTRIBUTE_HIDDEN __attribute__ ((__visibility__ ("hidden")))
const struct gcov_fn_info *const *functions; /* pointer to pointers
to function information */
#else
- const struct gcov_fn_info **functions;
+ struct gcov_fn_info **functions;
+ struct gcov_summary summary;
#endif /* !IN_GCOV_TOOL */
};
/* Exactly one of these will be active in the process. */
extern struct gcov_master __gcov_master;
+extern struct gcov_kvp *__gcov_kvp_dynamic_pool;
+extern unsigned __gcov_kvp_dynamic_pool_index;
+extern unsigned __gcov_kvp_dynamic_pool_size;
/* Dump a set of gcov objects. */
extern void __gcov_dump_one (struct gcov_root *) ATTRIBUTE_HIDDEN;
/* User function to enable early write of profile information so far. */
extern void __gcov_dump_int (void) ATTRIBUTE_HIDDEN;
+/* Lock critical section for __gcov_dump and __gcov_reset functions. */
+extern void __gcov_lock (void) ATTRIBUTE_HIDDEN;
+
+/* Unlock critical section for __gcov_dump and __gcov_reset functions. */
+extern void __gcov_unlock (void) ATTRIBUTE_HIDDEN;
+
/* The merge function that just sums the counters. */
extern void __gcov_merge_add (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
/* The merge function to select the minimum valid counter value. */
extern void __gcov_merge_time_profile (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
-/* The merge function to choose the most common value. */
-extern void __gcov_merge_single (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
+/* The merge function to choose the most common N values. */
+extern void __gcov_merge_topn (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
/* The merge function that just ors the counters together. */
extern void __gcov_merge_ior (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
unsigned);
extern void __gcov_pow2_profiler (gcov_type *, gcov_type);
extern void __gcov_pow2_profiler_atomic (gcov_type *, gcov_type);
-extern void __gcov_one_value_profiler (gcov_type *, gcov_type);
-extern void __gcov_one_value_profiler_atomic (gcov_type *, gcov_type);
-extern void __gcov_indirect_call_profiler_v3 (gcov_type, void *);
+extern void __gcov_topn_values_profiler (gcov_type *, gcov_type);
+extern void __gcov_topn_values_profiler_atomic (gcov_type *, gcov_type);
+extern void __gcov_indirect_call_profiler_v4 (gcov_type, void *);
+extern void __gcov_indirect_call_profiler_v4_atomic (gcov_type, void *);
extern void __gcov_time_profiler (gcov_type *);
extern void __gcov_time_profiler_atomic (gcov_type *);
extern void __gcov_average_profiler (gcov_type *, gcov_type);
#endif
}
+/* Similar function as gcov_get_counter(), but do not scale
+ when read value is equal to IGNORE_SCALING. */
+
+static inline gcov_type
+gcov_get_counter_ignore_scaling (gcov_type ignore_scaling ATTRIBUTE_UNUSED)
+{
+#ifndef IN_GCOV_TOOL
+ /* This version is for reading count values in libgcov runtime:
+ we read from gcda files. */
+
+ return gcov_read_counter ();
+#else
+ /* This version is for gcov-tool. We read the value from memory and
+ multiply it by the merge weight. */
+
+ gcov_type v = gcov_read_counter_mem ();
+ if (v != ignore_scaling)
+ v *= gcov_get_merge_weight ();
+
+ return v;
+#endif
+}
+
/* Similar function as gcov_get_counter(), but handles target address
counters. */
#endif
}
+/* Add VALUE to *COUNTER and make it with atomic operation
+ if USE_ATOMIC is true. */
+
+static inline void
+gcov_counter_add (gcov_type *counter, gcov_type value,
+ int use_atomic ATTRIBUTE_UNUSED)
+{
+#if GCOV_SUPPORTS_ATOMIC
+ if (use_atomic)
+ __atomic_fetch_add (counter, value, __ATOMIC_RELAXED);
+ else
+#endif
+ *counter += value;
+}
+
+#if HAVE_SYS_MMAN_H
+
+/* Allocate LENGTH with mmap function. */
+
+static inline void *
+malloc_mmap (size_t length)
+{
+ return mmap (NULL, length, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+}
+
+#endif
+
+/* Allocate gcov_kvp from statically pre-allocated pool,
+ or use heap otherwise. */
+
+static inline struct gcov_kvp *
+allocate_gcov_kvp (void)
+{
+#define MMAP_CHUNK_SIZE (128 * 1024)
+ struct gcov_kvp *new_node = NULL;
+ unsigned kvp_sizeof = sizeof(struct gcov_kvp);
+
+ /* Try mmaped pool if available. */
+#if !defined(IN_GCOV_TOOL) && !defined(L_gcov_merge_topn) && HAVE_SYS_MMAN_H
+ if (__gcov_kvp_dynamic_pool == NULL
+ || __gcov_kvp_dynamic_pool_index >= __gcov_kvp_dynamic_pool_size)
+ {
+ void *ptr = malloc_mmap (MMAP_CHUNK_SIZE);
+ if (ptr != MAP_FAILED)
+ {
+ __gcov_kvp_dynamic_pool = ptr;
+ __gcov_kvp_dynamic_pool_size = MMAP_CHUNK_SIZE / kvp_sizeof;
+ __gcov_kvp_dynamic_pool_index = 0;
+ }
+ }
+
+ if (__gcov_kvp_dynamic_pool != NULL)
+ {
+ unsigned index;
+#if GCOV_SUPPORTS_ATOMIC
+ index
+ = __atomic_fetch_add (&__gcov_kvp_dynamic_pool_index, 1,
+ __ATOMIC_RELAXED);
+#else
+ index = __gcov_kvp_dynamic_pool_index++;
+#endif
+ if (index < __gcov_kvp_dynamic_pool_size)
+ new_node = __gcov_kvp_dynamic_pool + index;
+ }
+#endif
+
+ /* Fallback to malloc. */
+ if (new_node == NULL)
+ new_node = (struct gcov_kvp *)xcalloc (1, kvp_sizeof);
+
+ return new_node;
+}
+
+/* Add key value pair VALUE:COUNT to a top N COUNTERS. When INCREMENT_TOTAL
+ is true, add COUNT to total of the TOP counter. If USE_ATOMIC is true,
+ do it in atomic way. Return true when the counter is full, otherwise
+ return false. */
+
+static inline unsigned
+gcov_topn_add_value (gcov_type *counters, gcov_type value, gcov_type count,
+ int use_atomic, int increment_total)
+{
+ if (increment_total)
+ {
+ /* In the multi-threaded mode, we can have an already merged profile
+ with a negative total value. In that case, we should bail out. */
+ if (counters[0] < 0)
+ return 0;
+ gcov_counter_add (&counters[0], 1, use_atomic);
+ }
+
+ struct gcov_kvp *prev_node = NULL;
+ struct gcov_kvp *minimal_node = NULL;
+ struct gcov_kvp *current_node = (struct gcov_kvp *)(intptr_t)counters[2];
+
+ while (current_node)
+ {
+ if (current_node->value == value)
+ {
+ gcov_counter_add (¤t_node->count, count, use_atomic);
+ return 0;
+ }
+
+ if (minimal_node == NULL
+ || current_node->count < minimal_node->count)
+ minimal_node = current_node;
+
+ prev_node = current_node;
+ current_node = current_node->next;
+ }
+
+ if (counters[1] == GCOV_TOPN_MAXIMUM_TRACKED_VALUES)
+ {
+ if (--minimal_node->count < count)
+ {
+ minimal_node->value = value;
+ minimal_node->count = count;
+ }
+
+ return 1;
+ }
+ else
+ {
+ struct gcov_kvp *new_node = allocate_gcov_kvp ();
+ if (new_node == NULL)
+ return 0;
+
+ new_node->value = value;
+ new_node->count = count;
+
+ int success = 0;
+ if (!counters[2])
+ {
+#if GCOV_SUPPORTS_ATOMIC
+ if (use_atomic)
+ {
+ struct gcov_kvp **ptr = (struct gcov_kvp **)(intptr_t)&counters[2];
+ success = !__sync_val_compare_and_swap (ptr, 0, new_node);
+ }
+ else
+#endif
+ {
+ counters[2] = (intptr_t)new_node;
+ success = 1;
+ }
+ }
+ else if (prev_node && !prev_node->next)
+ {
+#if GCOV_SUPPORTS_ATOMIC
+ if (use_atomic)
+ success = !__sync_val_compare_and_swap (&prev_node->next, 0,
+ new_node);
+ else
+#endif
+ {
+ prev_node->next = new_node;
+ success = 1;
+ }
+ }
+
+ /* Increment number of nodes. */
+ if (success)
+ gcov_counter_add (&counters[1], 1, use_atomic);
+ }
+
+ return 0;
+}
+
#endif /* !inhibit_libc */
#endif /* GCC_LIBGCOV_H */
git://gcc.gnu.org / gcc.git / blobdiff