/* Calculate branch probabilities, and basic block execution counts.
- Copyright (C) 1990, 1991, 1992, 1993, 1994, 1996, 1997, 1998, 1999,
- 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+ Copyright (C) 1990-2015 Free Software Foundation, Inc.
Contributed by James E. Wilson, UC Berkeley/Cygnus Support;
based on some ideas from Dain Samples of UC Berkeley.
Further mangling by Bob Manson, Cygnus Support.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
/* Generate basic block profile instrumentation and auxiliary files.
Profile generation is optimized, so that not all arcs in the basic
#include "tm.h"
#include "rtl.h"
#include "flags.h"
-#include "output.h"
#include "regs.h"
-#include "expr.h"
+#include "symtab.h"
+#include "hard-reg-set.h"
#include "function.h"
-#include "toplev.h"
+#include "alias.h"
+#include "tree.h"
+#include "insn-config.h"
+#include "expmed.h"
+#include "dojump.h"
+#include "explow.h"
+#include "calls.h"
+#include "emit-rtl.h"
+#include "varasm.h"
+#include "stmt.h"
+#include "expr.h"
+#include "predict.h"
+#include "dominance.h"
+#include "cfg.h"
+#include "cfganal.h"
+#include "basic-block.h"
+#include "diagnostic-core.h"
#include "coverage.h"
#include "value-prof.h"
-#include "tree.h"
-#include "cfghooks.h"
-#include "tree-flow.h"
-#include "timevar.h"
+#include "fold-const.h"
+#include "tree-ssa-alias.h"
+#include "internal-fn.h"
+#include "gimple-expr.h"
+#include "gimple.h"
+#include "gimple-iterator.h"
+#include "tree-cfg.h"
#include "cfgloop.h"
-#include "tree-pass.h"
+#include "dumpfile.h"
+#include "cgraph.h"
-/* Hooks for profiling. */
-static struct profile_hooks* profile_hooks;
+#include "profile.h"
-/* Additional information about the edges we need. */
-struct edge_info {
- unsigned int count_valid : 1;
-
- /* Is on the spanning tree. */
- unsigned int on_tree : 1;
-
- /* Pretend this edge does not exist (it is abnormal and we've
- inserted a fake to compensate). */
- unsigned int ignore : 1;
-};
-
-struct bb_info {
+struct bb_profile_info {
unsigned int count_valid : 1;
/* Number of successor and predecessor edges. */
gcov_type pred_count;
};
-#define EDGE_INFO(e) ((struct edge_info *) (e)->aux)
-#define BB_INFO(b) ((struct bb_info *) (b)->aux)
+#define BB_INFO(b) ((struct bb_profile_info *) (b)->aux)
+
/* Counter summary from the last set of coverage counts read. */
const struct gcov_ctr_summary *profile_info;
+/* Counter working set information computed from the current counter
+ summary. Not initialized unless profile_info summary is non-NULL. */
+static gcov_working_set_t gcov_working_sets[NUM_GCOV_WORKING_SETS];
+
/* Collect statistics on the performance of this pass for the entire source
file. */
static int total_num_passes;
static int total_num_times_called;
static int total_hist_br_prob[20];
-static int total_num_never_executed;
static int total_num_branches;
+/* Helper function to update gcov_working_sets. */
+
+void add_working_set (gcov_working_set_t *set) {
+ int i = 0;
+ for (; i < NUM_GCOV_WORKING_SETS; i++)
+ gcov_working_sets[i] = set[i];
+}
+
/* Forward declarations. */
static void find_spanning_tree (struct edge_list *);
-static unsigned instrument_edges (struct edge_list *);
-static void instrument_values (histogram_values);
-static void compute_branch_probabilities (void);
-static void compute_value_histograms (histogram_values);
-static gcov_type * get_exec_counts (void);
-static basic_block find_group (basic_block);
-static void union_groups (basic_block, basic_block);
-\f
/* Add edge instrumentation code to the entire insn chain.
F is the first insn of the chain.
int num_edges = NUM_EDGES (el);
basic_block bb;
- FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
+ FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR_FOR_FN (cfun), NULL, next_bb)
{
edge e;
edge_iterator ei;
FOR_EACH_EDGE (e, ei, bb->succs)
{
- struct edge_info *inf = EDGE_INFO (e);
+ struct edge_profile_info *inf = EDGE_INFO (e);
if (!inf->ignore && !inf->on_tree)
{
fprintf (dump_file, "Edge %d to %d instrumented%s\n",
e->src->index, e->dest->index,
EDGE_CRITICAL_P (e) ? " (and split)" : "");
- (profile_hooks->gen_edge_profiler) (num_instr_edges++, e);
+ gimple_gen_edge_profiler (num_instr_edges++, e);
}
}
}
static void
instrument_values (histogram_values values)
{
- unsigned i, t;
+ unsigned i;
/* Emit code to generate the histograms before the insns. */
- for (i = 0; i < VEC_length (histogram_value, values); i++)
+ for (i = 0; i < values.length (); i++)
{
- histogram_value hist = VEC_index (histogram_value, values, i);
+ histogram_value hist = values[i];
+ unsigned t = COUNTER_FOR_HIST_TYPE (hist->type);
+
+ if (!coverage_counter_alloc (t, hist->n_counters))
+ continue;
+
switch (hist->type)
{
case HIST_TYPE_INTERVAL:
- t = GCOV_COUNTER_V_INTERVAL;
+ gimple_gen_interval_profiler (hist, t, 0);
break;
case HIST_TYPE_POW2:
- t = GCOV_COUNTER_V_POW2;
+ gimple_gen_pow2_profiler (hist, t, 0);
break;
case HIST_TYPE_SINGLE_VALUE:
- t = GCOV_COUNTER_V_SINGLE;
+ gimple_gen_one_value_profiler (hist, t, 0);
break;
case HIST_TYPE_CONST_DELTA:
- t = GCOV_COUNTER_V_DELTA;
+ gimple_gen_const_delta_profiler (hist, t, 0);
break;
case HIST_TYPE_INDIR_CALL:
- t = GCOV_COUNTER_V_INDIR;
- break;
-
- default:
- gcc_unreachable ();
- }
- if (!coverage_counter_alloc (t, hist->n_counters))
- continue;
+ case HIST_TYPE_INDIR_CALL_TOPN:
+ gimple_gen_ic_profiler (hist, t, 0);
+ break;
- switch (hist->type)
- {
- case HIST_TYPE_INTERVAL:
- (profile_hooks->gen_interval_profiler) (hist, t, 0);
+ case HIST_TYPE_AVERAGE:
+ gimple_gen_average_profiler (hist, t, 0);
break;
- case HIST_TYPE_POW2:
- (profile_hooks->gen_pow2_profiler) (hist, t, 0);
+ case HIST_TYPE_IOR:
+ gimple_gen_ior_profiler (hist, t, 0);
break;
- case HIST_TYPE_SINGLE_VALUE:
- (profile_hooks->gen_one_value_profiler) (hist, t, 0);
- break;
-
- case HIST_TYPE_CONST_DELTA:
- (profile_hooks->gen_const_delta_profiler) (hist, t, 0);
- break;
+ case HIST_TYPE_TIME_PROFILE:
+ {
+ basic_block bb =
+ split_edge (single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun)));
+ gimple_stmt_iterator gsi = gsi_start_bb (bb);
- case HIST_TYPE_INDIR_CALL:
- (profile_hooks->gen_ic_profiler) (hist, t, 0);
- break;
+ gimple_gen_time_profiler (t, 0, gsi);
+ break;
+ }
default:
gcc_unreachable ();
}
\f
-/* Computes hybrid profile for all matching entries in da_file. */
+/* Fill the working set information into the profile_info structure. */
+
+void
+get_working_sets (void)
+{
+ unsigned ws_ix, pctinc, pct;
+ gcov_working_set_t *ws_info;
+
+ if (!profile_info)
+ return;
+
+ compute_working_sets (profile_info, gcov_working_sets);
+
+ if (dump_file)
+ {
+ fprintf (dump_file, "Counter working sets:\n");
+ /* Multiply the percentage by 100 to avoid float. */
+ pctinc = 100 * 100 / NUM_GCOV_WORKING_SETS;
+ for (ws_ix = 0, pct = pctinc; ws_ix < NUM_GCOV_WORKING_SETS;
+ ws_ix++, pct += pctinc)
+ {
+ if (ws_ix == NUM_GCOV_WORKING_SETS - 1)
+ pct = 9990;
+ ws_info = &gcov_working_sets[ws_ix];
+ /* Print out the percentage using int arithmatic to avoid float. */
+ fprintf (dump_file, "\t\t%u.%02u%%: num counts=%u, min counter="
+ "%" PRId64 "\n",
+ pct / 100, pct - (pct / 100 * 100),
+ ws_info->num_counters,
+ (int64_t)ws_info->min_counter);
+ }
+ }
+}
+
+/* Given a the desired percentage of the full profile (sum_all from the
+ summary), multiplied by 10 to avoid float in PCT_TIMES_10, returns
+ the corresponding working set information. If an exact match for
+ the percentage isn't found, the closest value is used. */
+
+gcov_working_set_t *
+find_working_set (unsigned pct_times_10)
+{
+ unsigned i;
+ if (!profile_info)
+ return NULL;
+ gcc_assert (pct_times_10 <= 1000);
+ if (pct_times_10 >= 999)
+ return &gcov_working_sets[NUM_GCOV_WORKING_SETS - 1];
+ i = pct_times_10 * NUM_GCOV_WORKING_SETS / 1000;
+ if (!i)
+ return &gcov_working_sets[0];
+ return &gcov_working_sets[i - 1];
+}
+
+/* Computes hybrid profile for all matching entries in da_file.
+
+ CFG_CHECKSUM is the precomputed checksum for the CFG. */
static gcov_type *
-get_exec_counts (void)
+get_exec_counts (unsigned cfg_checksum, unsigned lineno_checksum)
{
unsigned num_edges = 0;
basic_block bb;
gcov_type *counts;
/* Count the edges to be (possibly) instrumented. */
- FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
+ FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR_FOR_FN (cfun), NULL, next_bb)
{
edge e;
edge_iterator ei;
num_edges++;
}
- counts = get_coverage_counts (GCOV_COUNTER_ARCS, num_edges, &profile_info);
+ counts = get_coverage_counts (GCOV_COUNTER_ARCS, num_edges, cfg_checksum,
+ lineno_checksum, &profile_info);
if (!counts)
return NULL;
+ get_working_sets ();
+
if (dump_file && profile_info)
- fprintf(dump_file, "Merged %u profiles with maximal count %u.\n",
- profile_info->runs, (unsigned) profile_info->sum_max);
+ fprintf (dump_file, "Merged %u profiles with maximal count %u.\n",
+ profile_info->runs, (unsigned) profile_info->sum_max);
return counts;
}
-\f
-/* Compute the branch probabilities for the various branches.
- Annotate them accordingly. */
+
+static bool
+is_edge_inconsistent (vec<edge, va_gc> *edges)
+{
+ edge e;
+ edge_iterator ei;
+ FOR_EACH_EDGE (e, ei, edges)
+ {
+ if (!EDGE_INFO (e)->ignore)
+ {
+ if (e->count < 0
+ && (!(e->flags & EDGE_FAKE)
+ || !block_ends_with_call_p (e->src)))
+ {
+ if (dump_file)
+ {
+ fprintf (dump_file,
+ "Edge %i->%i is inconsistent, count%" PRId64,
+ e->src->index, e->dest->index, e->count);
+ dump_bb (dump_file, e->src, 0, TDF_DETAILS);
+ dump_bb (dump_file, e->dest, 0, TDF_DETAILS);
+ }
+ return true;
+ }
+ }
+ }
+ return false;
+}
static void
-compute_branch_probabilities (void)
+correct_negative_edge_counts (void)
{
basic_block bb;
- int i;
- int num_edges = 0;
- int changes;
- int passes;
- int hist_br_prob[20];
- int num_never_executed;
- int num_branches;
- gcov_type *exec_counts = get_exec_counts ();
- int exec_counts_pos = 0;
+ edge e;
+ edge_iterator ei;
- /* Very simple sanity checks so we catch bugs in our profiling code. */
- if (profile_info)
+ FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR_FOR_FN (cfun), NULL, next_bb)
{
- if (profile_info->run_max * profile_info->runs < profile_info->sum_max)
- {
- error ("corrupted profile info: run_max * runs < sum_max");
- exec_counts = NULL;
- }
+ FOR_EACH_EDGE (e, ei, bb->succs)
+ {
+ if (e->count < 0)
+ e->count = 0;
+ }
+ }
+}
- if (profile_info->sum_all < profile_info->sum_max)
+/* Check consistency.
+ Return true if inconsistency is found. */
+static bool
+is_inconsistent (void)
+{
+ basic_block bb;
+ bool inconsistent = false;
+ FOR_EACH_BB_FN (bb, cfun)
+ {
+ inconsistent |= is_edge_inconsistent (bb->preds);
+ if (!dump_file && inconsistent)
+ return true;
+ inconsistent |= is_edge_inconsistent (bb->succs);
+ if (!dump_file && inconsistent)
+ return true;
+ if (bb->count < 0)
+ {
+ if (dump_file)
+ {
+ fprintf (dump_file, "BB %i count is negative "
+ "%" PRId64,
+ bb->index,
+ bb->count);
+ dump_bb (dump_file, bb, 0, TDF_DETAILS);
+ }
+ inconsistent = true;
+ }
+ if (bb->count != sum_edge_counts (bb->preds))
+ {
+ if (dump_file)
+ {
+ fprintf (dump_file, "BB %i count does not match sum of incoming edges "
+ "%" PRId64" should be %" PRId64,
+ bb->index,
+ bb->count,
+ sum_edge_counts (bb->preds));
+ dump_bb (dump_file, bb, 0, TDF_DETAILS);
+ }
+ inconsistent = true;
+ }
+ if (bb->count != sum_edge_counts (bb->succs) &&
+ ! (find_edge (bb, EXIT_BLOCK_PTR_FOR_FN (cfun)) != NULL
+ && block_ends_with_call_p (bb)))
{
- error ("corrupted profile info: sum_all is smaller than sum_max");
- exec_counts = NULL;
+ if (dump_file)
+ {
+ fprintf (dump_file, "BB %i count does not match sum of outgoing edges "
+ "%" PRId64" should be %" PRId64,
+ bb->index,
+ bb->count,
+ sum_edge_counts (bb->succs));
+ dump_bb (dump_file, bb, 0, TDF_DETAILS);
+ }
+ inconsistent = true;
}
+ if (!dump_file && inconsistent)
+ return true;
}
- /* Attach extra info block to each bb. */
+ return inconsistent;
+}
- alloc_aux_for_blocks (sizeof (struct bb_info));
- FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
+/* Set each basic block count to the sum of its outgoing edge counts */
+static void
+set_bb_counts (void)
+{
+ basic_block bb;
+ FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR_FOR_FN (cfun), NULL, next_bb)
{
- edge e;
- edge_iterator ei;
-
- FOR_EACH_EDGE (e, ei, bb->succs)
- if (!EDGE_INFO (e)->ignore)
- BB_INFO (bb)->succ_count++;
- FOR_EACH_EDGE (e, ei, bb->preds)
- if (!EDGE_INFO (e)->ignore)
- BB_INFO (bb)->pred_count++;
+ bb->count = sum_edge_counts (bb->succs);
+ gcc_assert (bb->count >= 0);
}
+}
- /* Avoid predicting entry on exit nodes. */
- BB_INFO (EXIT_BLOCK_PTR)->succ_count = 2;
- BB_INFO (ENTRY_BLOCK_PTR)->pred_count = 2;
-
+/* Reads profile data and returns total number of edge counts read */
+static int
+read_profile_edge_counts (gcov_type *exec_counts)
+{
+ basic_block bb;
+ int num_edges = 0;
+ int exec_counts_pos = 0;
/* For each edge not on the spanning tree, set its execution count from
the .da file. */
-
/* The first count in the .da file is the number of times that the function
was entered. This is the exec_count for block zero. */
- FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
+ FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR_FOR_FN (cfun), NULL, next_bb)
{
edge e;
edge_iterator ei;
e->count = exec_counts[exec_counts_pos++];
if (e->count > profile_info->sum_max)
{
- error ("corrupted profile info: edge from %i to %i exceeds maximal count",
- bb->index, e->dest->index);
+ if (flag_profile_correction)
+ {
+ static bool informed = 0;
+ if (dump_enabled_p () && !informed)
+ dump_printf_loc (MSG_NOTE, input_location,
+ "corrupted profile info: edge count"
+ " exceeds maximal count\n");
+ informed = 1;
+ }
+ else
+ error ("corrupted profile info: edge from %i to %i exceeds maximal count",
+ bb->index, e->dest->index);
}
}
else
{
fprintf (dump_file, "\nRead edge from %i to %i, count:",
bb->index, e->dest->index);
- fprintf (dump_file, HOST_WIDEST_INT_PRINT_DEC,
- (HOST_WIDEST_INT) e->count);
+ fprintf (dump_file, "%" PRId64,
+ (int64_t) e->count);
}
}
}
+ return num_edges;
+}
+
+#define OVERLAP_BASE 10000
+
+/* Compare the static estimated profile to the actual profile, and
+ return the "degree of overlap" measure between them.
+
+ Degree of overlap is a number between 0 and OVERLAP_BASE. It is
+ the sum of each basic block's minimum relative weights between
+ two profiles. And overlap of OVERLAP_BASE means two profiles are
+ identical. */
+
+static int
+compute_frequency_overlap (void)
+{
+ gcov_type count_total = 0, freq_total = 0;
+ int overlap = 0;
+ basic_block bb;
+
+ FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR_FOR_FN (cfun), NULL, next_bb)
+ {
+ count_total += bb->count;
+ freq_total += bb->frequency;
+ }
+
+ if (count_total == 0 || freq_total == 0)
+ return 0;
+
+ FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR_FOR_FN (cfun), NULL, next_bb)
+ overlap += MIN (bb->count * OVERLAP_BASE / count_total,
+ bb->frequency * OVERLAP_BASE / freq_total);
+
+ return overlap;
+}
+
+/* Compute the branch probabilities for the various branches.
+ Annotate them accordingly.
+
+ CFG_CHECKSUM is the precomputed checksum for the CFG. */
+
+static void
+compute_branch_probabilities (unsigned cfg_checksum, unsigned lineno_checksum)
+{
+ basic_block bb;
+ int i;
+ int num_edges = 0;
+ int changes;
+ int passes;
+ int hist_br_prob[20];
+ int num_branches;
+ gcov_type *exec_counts = get_exec_counts (cfg_checksum, lineno_checksum);
+ int inconsistent = 0;
+
+ /* Very simple sanity checks so we catch bugs in our profiling code. */
+ if (!profile_info)
+ return;
+
+ if (profile_info->sum_all < profile_info->sum_max)
+ {
+ error ("corrupted profile info: sum_all is smaller than sum_max");
+ exec_counts = NULL;
+ }
+
+ /* Attach extra info block to each bb. */
+ alloc_aux_for_blocks (sizeof (struct bb_profile_info));
+ FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR_FOR_FN (cfun), NULL, next_bb)
+ {
+ edge e;
+ edge_iterator ei;
+
+ FOR_EACH_EDGE (e, ei, bb->succs)
+ if (!EDGE_INFO (e)->ignore)
+ BB_INFO (bb)->succ_count++;
+ FOR_EACH_EDGE (e, ei, bb->preds)
+ if (!EDGE_INFO (e)->ignore)
+ BB_INFO (bb)->pred_count++;
+ }
+
+ /* Avoid predicting entry on exit nodes. */
+ BB_INFO (EXIT_BLOCK_PTR_FOR_FN (cfun))->succ_count = 2;
+ BB_INFO (ENTRY_BLOCK_PTR_FOR_FN (cfun))->pred_count = 2;
+
+ num_edges = read_profile_edge_counts (exec_counts);
+
if (dump_file)
fprintf (dump_file, "\n%d edge counts read\n", num_edges);
{
passes++;
changes = 0;
- FOR_BB_BETWEEN (bb, EXIT_BLOCK_PTR, NULL, prev_bb)
+ FOR_BB_BETWEEN (bb, EXIT_BLOCK_PTR_FOR_FN (cfun), NULL, prev_bb)
{
- struct bb_info *bi = BB_INFO (bb);
+ struct bb_profile_info *bi = BB_INFO (bb);
if (! bi->count_valid)
{
if (bi->succ_count == 0)
FOR_EACH_EDGE (e, ei, bb->succs)
total += e->count;
- /* Seedgeh for the invalid edge, and set its count. */
+ /* Search for the invalid edge, and set its count. */
FOR_EACH_EDGE (e, ei, bb->succs)
if (! EDGE_INFO (e)->count_valid && ! EDGE_INFO (e)->ignore)
break;
}
}
if (dump_file)
- dump_flow_info (dump_file, dump_flags);
+ {
+ int overlap = compute_frequency_overlap ();
+ gimple_dump_cfg (dump_file, dump_flags);
+ fprintf (dump_file, "Static profile overlap: %d.%d%%\n",
+ overlap / (OVERLAP_BASE / 100),
+ overlap % (OVERLAP_BASE / 100));
+ }
total_num_passes += passes;
if (dump_file)
/* If the graph has been correctly solved, every block will have a
succ and pred count of zero. */
- FOR_EACH_BB (bb)
+ FOR_EACH_BB_FN (bb, cfun)
{
gcc_assert (!BB_INFO (bb)->succ_count && !BB_INFO (bb)->pred_count);
}
+ /* Check for inconsistent basic block counts */
+ inconsistent = is_inconsistent ();
+
+ if (inconsistent)
+ {
+ if (flag_profile_correction)
+ {
+ /* Inconsistency detected. Make it flow-consistent. */
+ static int informed = 0;
+ if (dump_enabled_p () && informed == 0)
+ {
+ informed = 1;
+ dump_printf_loc (MSG_NOTE, input_location,
+ "correcting inconsistent profile data\n");
+ }
+ correct_negative_edge_counts ();
+ /* Set bb counts to the sum of the outgoing edge counts */
+ set_bb_counts ();
+ if (dump_file)
+ fprintf (dump_file, "\nCalling mcf_smooth_cfg\n");
+ mcf_smooth_cfg ();
+ }
+ else
+ error ("corrupted profile info: profile data is not flow-consistent");
+ }
+
/* For every edge, calculate its branch probability and add a reg_note
to the branch insn to indicate this. */
for (i = 0; i < 20; i++)
hist_br_prob[i] = 0;
- num_never_executed = 0;
num_branches = 0;
- FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
+ FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR_FOR_FN (cfun), NULL, next_bb)
{
edge e;
edge_iterator ei;
already present. We get negative frequency from the entry
point. */
if ((e->count < 0
- && e->dest == EXIT_BLOCK_PTR)
+ && e->dest == EXIT_BLOCK_PTR_FOR_FN (cfun))
|| (e->count > bb->count
- && e->dest != EXIT_BLOCK_PTR))
+ && e->dest != EXIT_BLOCK_PTR_FOR_FN (cfun)))
{
if (block_ends_with_call_p (bb))
e->count = e->count < 0 ? 0 : bb->count;
if (bb->count)
{
FOR_EACH_EDGE (e, ei, bb->succs)
- e->probability = (e->count * REG_BR_PROB_BASE + bb->count / 2) / bb->count;
+ e->probability = GCOV_COMPUTE_SCALE (e->count, bb->count);
if (bb->index >= NUM_FIXED_BLOCKS
&& block_ends_with_condjump_p (bb)
&& EDGE_COUNT (bb->succs) >= 2)
give all abnormals frequency of 0, otherwise distribute the
frequency over abnormals (this is the case of noreturn
calls). */
- else if (profile_status == PROFILE_ABSENT)
+ else if (profile_status_for_fn (cfun) == PROFILE_ABSENT)
{
int total = 0;
if (bb->index >= NUM_FIXED_BLOCKS
&& block_ends_with_condjump_p (bb)
&& EDGE_COUNT (bb->succs) >= 2)
- num_branches++, num_never_executed;
+ num_branches++;
}
}
counts_to_freqs ();
+ profile_status_for_fn (cfun) = PROFILE_READ;
+ compute_function_frequency ();
if (dump_file)
{
fprintf (dump_file, "%d branches\n", num_branches);
- fprintf (dump_file, "%d branches never executed\n",
- num_never_executed);
if (num_branches)
for (i = 0; i < 10; i++)
fprintf (dump_file, "%d%% branches in range %d-%d%%\n",
5 * i, 5 * i + 5);
total_num_branches += num_branches;
- total_num_never_executed += num_never_executed;
for (i = 0; i < 20; i++)
total_hist_br_prob[i] += hist_br_prob[i];
}
/* Load value histograms values whose description is stored in VALUES array
- from .gcda file. */
+ from .gcda file.
+
+ CFG_CHECKSUM is the precomputed checksum for the CFG. */
static void
-compute_value_histograms (histogram_values values)
+compute_value_histograms (histogram_values values, unsigned cfg_checksum,
+ unsigned lineno_checksum)
{
unsigned i, j, t, any;
unsigned n_histogram_counters[GCOV_N_VALUE_COUNTERS];
gcov_type *histogram_counts[GCOV_N_VALUE_COUNTERS];
gcov_type *act_count[GCOV_N_VALUE_COUNTERS];
gcov_type *aact_count;
-
+ struct cgraph_node *node;
+
for (t = 0; t < GCOV_N_VALUE_COUNTERS; t++)
n_histogram_counters[t] = 0;
- for (i = 0; i < VEC_length (histogram_value, values); i++)
+ for (i = 0; i < values.length (); i++)
{
- histogram_value hist = VEC_index (histogram_value, values, i);
+ histogram_value hist = values[i];
n_histogram_counters[(int) hist->type] += hist->n_counters;
}
histogram_counts[t] =
get_coverage_counts (COUNTER_FOR_HIST_TYPE (t),
- n_histogram_counters[t], NULL);
+ n_histogram_counters[t], cfg_checksum,
+ lineno_checksum, NULL);
if (histogram_counts[t])
any = 1;
act_count[t] = histogram_counts[t];
if (!any)
return;
- for (i = 0; i < VEC_length (histogram_value, values); i++)
+ for (i = 0; i < values.length (); i++)
{
- histogram_value hist = VEC_index (histogram_value, values, i);
- tree stmt = hist->hvalue.stmt;
+ histogram_value hist = values[i];
+ gimple stmt = hist->hvalue.stmt;
t = (int) hist->type;
aact_count = act_count[t];
- act_count[t] += hist->n_counters;
+
+ if (act_count[t])
+ act_count[t] += hist->n_counters;
gimple_add_histogram_value (cfun, stmt, hist);
hist->hvalue.counters = XNEWVEC (gcov_type, hist->n_counters);
for (j = 0; j < hist->n_counters; j++)
- hist->hvalue.counters[j] = aact_count[j];
+ if (aact_count)
+ hist->hvalue.counters[j] = aact_count[j];
+ else
+ hist->hvalue.counters[j] = 0;
+
+ /* Time profiler counter is not related to any statement,
+ so that we have to read the counter and set the value to
+ the corresponding call graph node. */
+ if (hist->type == HIST_TYPE_TIME_PROFILE)
+ {
+ node = cgraph_node::get (hist->fun->decl);
+ node->tp_first_run = hist->hvalue.counters[0];
+
+ if (dump_file)
+ fprintf (dump_file, "Read tp_first_run: %d\n", node->tp_first_run);
+ }
}
for (t = 0; t < GCOV_N_VALUE_COUNTERS; t++)
- if (histogram_counts[t])
- free (histogram_counts[t]);
+ free (histogram_counts[t]);
}
-/* The entry basic block will be moved around so that it has index=1,
- there is nothing at index 0 and the exit is at n_basic_block. */
-#define BB_TO_GCOV_INDEX(bb) ((bb)->index - 1)
/* When passed NULL as file_name, initialize.
When passed something else, output the necessary commands to change
line to LINE and offset to FILE_NAME. */
return;
}
- name_differs = !prev_file_name || strcmp (file_name, prev_file_name);
+ name_differs = !prev_file_name || filename_cmp (file_name, prev_file_name);
line_differs = prev_line != line;
if (name_differs || line_differs)
if (!*offset)
{
*offset = gcov_write_tag (GCOV_TAG_LINES);
- gcov_write_unsigned (BB_TO_GCOV_INDEX (bb));
+ gcov_write_unsigned (bb->index);
name_differs = line_differs=true;
}
}
}
-/* Instrument and/or analyze program behavior based on program flow graph.
- In either case, this function builds a flow graph for the function being
- compiled. The flow graph is stored in BB_GRAPH.
+/* Instrument and/or analyze program behavior based on program the CFG.
+
+ This function creates a representation of the control flow graph (of
+ the function being compiled) that is suitable for the instrumentation
+ of edges and/or converting measured edge counts to counts on the
+ complete CFG.
When FLAG_PROFILE_ARCS is nonzero, this function instruments the edges in
the flow graph that are needed to reconstruct the dynamic behavior of the
- flow graph.
+ flow graph. This data is written to the gcno file for gcov.
When FLAG_BRANCH_PROBABILITIES is nonzero, this function reads auxiliary
- information from a data file containing edge count information from previous
- executions of the function being compiled. In this case, the flow graph is
- annotated with actual execution counts, which are later propagated into the
- rtl for optimization purposes.
+ information from the gcda file containing edge count information from
+ previous executions of the function being compiled. In this case, the
+ control flow graph is annotated with actual execution counts by
+ compute_branch_probabilities().
Main entry point of this file. */
unsigned num_edges, ignored_edges;
unsigned num_instrumented;
struct edge_list *el;
- histogram_values values = NULL;
+ histogram_values values = histogram_values ();
+ unsigned cfg_checksum, lineno_checksum;
total_num_times_called++;
We also add fake exit edges for each call and asm statement in the
basic, since it may not return. */
- FOR_EACH_BB (bb)
+ FOR_EACH_BB_FN (bb, cfun)
{
int need_exit_edge = 0, need_entry_edge = 0;
int have_exit_edge = 0, have_entry_edge = 0;
FOR_EACH_EDGE (e, ei, bb->succs)
{
- block_stmt_iterator bsi;
- tree last = NULL;
+ gimple_stmt_iterator gsi;
+ gimple last = NULL;
/* It may happen that there are compiler generated statements
without a locus at all. Go through the basic block from the
last to the first statement looking for a locus. */
- for (bsi = bsi_last (bb); !bsi_end_p (bsi); bsi_prev (&bsi))
+ for (gsi = gsi_last_nondebug_bb (bb);
+ !gsi_end_p (gsi);
+ gsi_prev_nondebug (&gsi))
{
- last = bsi_stmt (bsi);
- if (EXPR_LOCUS (last))
+ last = gsi_stmt (gsi);
+ if (gimple_has_location (last))
break;
}
/* Edge with goto locus might get wrong coverage info unless
- it is the only edge out of BB.
- Don't do that when the locuses match, so
+ it is the only edge out of BB.
+ Don't do that when the locuses match, so
if (blah) goto something;
is not computed twice. */
- if (last && EXPR_LOCUS (last)
- && e->goto_locus
+ if (last
+ && gimple_has_location (last)
+ && LOCATION_LOCUS (e->goto_locus) != UNKNOWN_LOCATION
&& !single_succ_p (bb)
-#ifdef USE_MAPPED_LOCATION
&& (LOCATION_FILE (e->goto_locus)
- != LOCATION_FILE (EXPR_LOCATION (last))
+ != LOCATION_FILE (gimple_location (last))
|| (LOCATION_LINE (e->goto_locus)
- != LOCATION_LINE (EXPR_LOCATION (last)))))
-#else
- && (e->goto_locus->file != EXPR_LOCUS (last)->file
- || (e->goto_locus->line != EXPR_LOCUS (last)->line)))
-#endif
+ != LOCATION_LINE (gimple_location (last)))))
{
- basic_block new = split_edge (e);
- single_succ_edge (new)->goto_locus = e->goto_locus;
+ basic_block new_bb = split_edge (e);
+ edge ne = single_succ_edge (new_bb);
+ ne->goto_locus = e->goto_locus;
}
if ((e->flags & (EDGE_ABNORMAL | EDGE_ABNORMAL_CALL))
- && e->dest != EXIT_BLOCK_PTR)
+ && e->dest != EXIT_BLOCK_PTR_FOR_FN (cfun))
need_exit_edge = 1;
- if (e->dest == EXIT_BLOCK_PTR)
+ if (e->dest == EXIT_BLOCK_PTR_FOR_FN (cfun))
have_exit_edge = 1;
}
FOR_EACH_EDGE (e, ei, bb->preds)
{
if ((e->flags & (EDGE_ABNORMAL | EDGE_ABNORMAL_CALL))
- && e->src != ENTRY_BLOCK_PTR)
+ && e->src != ENTRY_BLOCK_PTR_FOR_FN (cfun))
need_entry_edge = 1;
- if (e->src == ENTRY_BLOCK_PTR)
+ if (e->src == ENTRY_BLOCK_PTR_FOR_FN (cfun))
have_entry_edge = 1;
}
if (dump_file)
fprintf (dump_file, "Adding fake exit edge to bb %i\n",
bb->index);
- make_edge (bb, EXIT_BLOCK_PTR, EDGE_FAKE);
+ make_edge (bb, EXIT_BLOCK_PTR_FOR_FN (cfun), EDGE_FAKE);
}
if (need_entry_edge && !have_entry_edge)
{
if (dump_file)
fprintf (dump_file, "Adding fake entry edge to bb %i\n",
bb->index);
- make_edge (ENTRY_BLOCK_PTR, bb, EDGE_FAKE);
+ make_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun), bb, EDGE_FAKE);
+ /* Avoid bbs that have both fake entry edge and also some
+ exit edge. One of those edges wouldn't be added to the
+ spanning tree, but we can't instrument any of them. */
+ if (have_exit_edge || need_exit_edge)
+ {
+ gimple_stmt_iterator gsi;
+ gimple first;
+
+ gsi = gsi_start_nondebug_after_labels_bb (bb);
+ gcc_checking_assert (!gsi_end_p (gsi));
+ first = gsi_stmt (gsi);
+ /* Don't split the bbs containing __builtin_setjmp_receiver
+ or ABNORMAL_DISPATCHER calls. These are very
+ special and don't expect anything to be inserted before
+ them. */
+ if (is_gimple_call (first)
+ && (gimple_call_builtin_p (first, BUILT_IN_SETJMP_RECEIVER)
+ || (gimple_call_flags (first) & ECF_RETURNS_TWICE)
+ || (gimple_call_internal_p (first)
+ && (gimple_call_internal_fn (first)
+ == IFN_ABNORMAL_DISPATCHER))))
+ continue;
+
+ if (dump_file)
+ fprintf (dump_file, "Splitting bb %i after labels\n",
+ bb->index);
+ split_block_after_labels (bb);
+ }
}
}
el = create_edge_list ();
num_edges = NUM_EDGES (el);
- alloc_aux_for_edges (sizeof (struct edge_info));
+ alloc_aux_for_edges (sizeof (struct edge_profile_info));
/* The basic blocks are expected to be numbered sequentially. */
compact_blocks ();
/* Mark edges we've replaced by fake edges above as ignored. */
if ((e->flags & (EDGE_ABNORMAL | EDGE_ABNORMAL_CALL))
- && e->src != ENTRY_BLOCK_PTR && e->dest != EXIT_BLOCK_PTR)
+ && e->src != ENTRY_BLOCK_PTR_FOR_FN (cfun)
+ && e->dest != EXIT_BLOCK_PTR_FOR_FN (cfun))
{
EDGE_INFO (e)->ignore = 1;
ignored_edges++;
for (num_instrumented = i = 0; i < num_edges; i++)
{
edge e = INDEX_EDGE (el, i);
- struct edge_info *inf = EDGE_INFO (e);
+ struct edge_profile_info *inf = EDGE_INFO (e);
if (inf->ignore || inf->on_tree)
/*NOP*/;
num_instrumented++;
}
- total_num_blocks += n_basic_blocks;
+ total_num_blocks += n_basic_blocks_for_fn (cfun);
if (dump_file)
- fprintf (dump_file, "%d basic blocks\n", n_basic_blocks);
+ fprintf (dump_file, "%d basic blocks\n", n_basic_blocks_for_fn (cfun));
total_num_edges += num_edges;
if (dump_file)
if (dump_file)
fprintf (dump_file, "%d ignored edges\n", ignored_edges);
- /* Write the data from which gcov can reconstruct the basic block
- graph. */
+ total_num_edges_instrumented += num_instrumented;
+ if (dump_file)
+ fprintf (dump_file, "%d instrumentation edges\n", num_instrumented);
- /* Basic block flags */
- if (coverage_begin_output ())
+ /* Compute two different checksums. Note that we want to compute
+ the checksum in only once place, since it depends on the shape
+ of the control flow which can change during
+ various transformations. */
+ cfg_checksum = coverage_compute_cfg_checksum (cfun);
+ lineno_checksum = coverage_compute_lineno_checksum ();
+
+ /* Write the data from which gcov can reconstruct the basic block
+ graph and function line numbers (the gcno file). */
+ if (coverage_begin_function (lineno_checksum, cfg_checksum))
{
gcov_position_t offset;
+ /* Basic block flags */
offset = gcov_write_tag (GCOV_TAG_BLOCKS);
- for (i = 0; i != (unsigned) (n_basic_blocks); i++)
+ for (i = 0; i != (unsigned) (n_basic_blocks_for_fn (cfun)); i++)
gcov_write_unsigned (0);
gcov_write_length (offset);
- }
- /* Keep all basic block indexes nonnegative in the gcov output.
- Index 0 is used for entry block, last index is for exit block.
- */
- ENTRY_BLOCK_PTR->index = 1;
- EXIT_BLOCK_PTR->index = last_basic_block;
-
- /* Arcs */
- if (coverage_begin_output ())
- {
- gcov_position_t offset;
-
- FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, EXIT_BLOCK_PTR, next_bb)
+ /* Arcs */
+ FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR_FOR_FN (cfun),
+ EXIT_BLOCK_PTR_FOR_FN (cfun), next_bb)
{
edge e;
edge_iterator ei;
offset = gcov_write_tag (GCOV_TAG_ARCS);
- gcov_write_unsigned (BB_TO_GCOV_INDEX (bb));
+ gcov_write_unsigned (bb->index);
FOR_EACH_EDGE (e, ei, bb->succs)
{
- struct edge_info *i = EDGE_INFO (e);
+ struct edge_profile_info *i = EDGE_INFO (e);
if (!i->ignore)
{
unsigned flag_bits = 0;
&& e->src->next_bb == e->dest)
flag_bits |= GCOV_ARC_FALLTHROUGH;
- gcov_write_unsigned (BB_TO_GCOV_INDEX (e->dest));
+ gcov_write_unsigned (e->dest->index);
gcov_write_unsigned (flag_bits);
}
}
gcov_write_length (offset);
}
- }
-
- /* Line numbers. */
- if (coverage_begin_output ())
- {
- gcov_position_t offset;
+ /* Line numbers. */
/* Initialize the output. */
output_location (NULL, 0, NULL, NULL);
- FOR_EACH_BB (bb)
+ FOR_EACH_BB_FN (bb, cfun)
{
- block_stmt_iterator bsi;
-
- offset = 0;
+ gimple_stmt_iterator gsi;
+ gcov_position_t offset = 0;
- if (bb == ENTRY_BLOCK_PTR->next_bb)
+ if (bb == ENTRY_BLOCK_PTR_FOR_FN (cfun)->next_bb)
{
- expanded_location curr_location =
+ expanded_location curr_location =
expand_location (DECL_SOURCE_LOCATION (current_function_decl));
output_location (curr_location.file, curr_location.line,
&offset, bb);
}
- for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
+ for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
{
- tree stmt = bsi_stmt (bsi);
- if (EXPR_HAS_LOCATION (stmt))
- output_location (EXPR_FILENAME (stmt), EXPR_LINENO (stmt),
+ gimple stmt = gsi_stmt (gsi);
+ if (gimple_has_location (stmt))
+ output_location (gimple_filename (stmt), gimple_lineno (stmt),
&offset, bb);
}
- /* Notice GOTO expressions we eliminated while constructing the
- CFG. */
- if (single_succ_p (bb) && single_succ_edge (bb)->goto_locus)
+ /* Notice GOTO expressions eliminated while constructing the CFG. */
+ if (single_succ_p (bb)
+ && LOCATION_LOCUS (single_succ_edge (bb)->goto_locus)
+ != UNKNOWN_LOCATION)
{
- /* ??? source_locus type is marked deprecated in input.h. */
- source_locus curr_location = single_succ_edge (bb)->goto_locus;
- /* ??? The FILE/LINE API is inconsistent for these cases. */
-#ifdef USE_MAPPED_LOCATION
- output_location (LOCATION_FILE (curr_location),
- LOCATION_LINE (curr_location), &offset, bb);
-#else
- output_location (curr_location->file, curr_location->line,
+ expanded_location curr_location
+ = expand_location (single_succ_edge (bb)->goto_locus);
+ output_location (curr_location.file, curr_location.line,
&offset, bb);
-#endif
}
if (offset)
}
}
- ENTRY_BLOCK_PTR->index = ENTRY_BLOCK;
- EXIT_BLOCK_PTR->index = EXIT_BLOCK;
-#undef BB_TO_GCOV_INDEX
-
if (flag_profile_values)
- find_values_to_profile (&values);
+ gimple_find_values_to_profile (&values);
if (flag_branch_probabilities)
{
- compute_branch_probabilities ();
+ compute_branch_probabilities (cfg_checksum, lineno_checksum);
if (flag_profile_values)
- compute_value_histograms (values);
+ compute_value_histograms (values, cfg_checksum, lineno_checksum);
}
remove_fake_edges ();
{
unsigned n_instrumented;
- profile_hooks->init_edge_profiler ();
+ gimple_init_edge_profiler ();
n_instrumented = instrument_edges (el);
instrument_values (values);
/* Commit changes done by instrumentation. */
- bsi_commit_edge_inserts ();
+ gsi_commit_edge_inserts ();
}
free_aux_for_edges ();
- VEC_free (histogram_value, heap, values);
+ values.release ();
free_edge_list (el);
- if (flag_branch_probabilities)
- profile_status = PROFILE_READ;
- coverage_end_function ();
+ coverage_end_function (lineno_checksum, cfg_checksum);
}
\f
/* Union find algorithm implementation for the basic blocks using
basic_block bb;
/* We use aux field for standard union-find algorithm. */
- FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
+ FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR_FOR_FN (cfun), NULL, next_bb)
bb->aux = bb;
/* Add fake edge exit to entry we can't instrument. */
- union_groups (EXIT_BLOCK_PTR, ENTRY_BLOCK_PTR);
+ union_groups (EXIT_BLOCK_PTR_FOR_FN (cfun), ENTRY_BLOCK_PTR_FOR_FN (cfun));
/* First add all abnormal edges to the tree unless they form a cycle. Also
- add all edges to EXIT_BLOCK_PTR to avoid inserting profiling code behind
+ add all edges to the exit block to avoid inserting profiling code behind
setting return value from function. */
for (i = 0; i < num_edges; i++)
{
edge e = INDEX_EDGE (el, i);
if (((e->flags & (EDGE_ABNORMAL | EDGE_ABNORMAL_CALL | EDGE_FAKE))
- || e->dest == EXIT_BLOCK_PTR)
+ || e->dest == EXIT_BLOCK_PTR_FOR_FN (cfun))
&& !EDGE_INFO (e)->ignore
&& (find_group (e->src) != find_group (e->dest)))
{
}
}
- FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
- bb->aux = NULL;
+ clear_aux_for_blocks ();
}
\f
/* Perform file-level initialization for branch-prob processing. */
total_num_passes = 0;
total_num_times_called = 0;
total_num_branches = 0;
- total_num_never_executed = 0;
for (i = 0; i < 20; i++)
total_hist_br_prob[i] = 0;
}
/ total_num_times_called);
fprintf (dump_file, "Total number of branches: %d\n",
total_num_branches);
- fprintf (dump_file, "Total number of branches never executed: %d\n",
- total_num_never_executed);
if (total_num_branches)
{
int i;
}
}
}
-
-/* Set up hooks to enable tree-based profiling. */
-
-void
-tree_register_profile_hooks (void)
-{
- gcc_assert (current_ir_type () == IR_GIMPLE);
- profile_hooks = &tree_profile_hooks;
-}
-