/* Calculate branch probabilities, and basic block execution counts.
Copyright (C) 1990, 1991, 1992, 1993, 1994, 1996, 1997, 1998, 1999,
- 2000, 2001 Free Software Foundation, Inc.
+ 2000, 2001, 2002, 2003, 2004, 2005 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.
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, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA. */
+
+/* Generate basic block profile instrumentation and auxiliary files.
+ Profile generation is optimized, so that not all arcs in the basic
+ block graph need instrumenting. First, the BB graph is closed with
+ one entry (function start), and one exit (function exit). Any
+ ABNORMAL_EDGE cannot be instrumented (because there is no control
+ path to place the code). We close the graph by inserting fake
+ EDGE_FAKE edges to the EXIT_BLOCK, from the sources of abnormal
+ edges that do not go to the exit_block. We ignore such abnormal
+ edges. Naturally these fake edges are never directly traversed,
+ and so *cannot* be directly instrumented. Some other graph
+ massaging is done. To optimize the instrumentation we generate the
+ BB minimal span tree, only edges that are not on the span tree
+ (plus the entry point) need instrumenting. From that information
+ all other edge counts can be deduced. By construction all fake
+ edges must be on the spanning tree. We also attempt to place
+ EDGE_CRITICAL edges on the spanning tree.
+
+ The auxiliary files generated are <dumpbase>.gcno (at compile time)
+ and <dumpbase>.gcda (at run time). The format is
+ described in full in gcov-io.h. */
/* ??? Register allocation should use basic block execution counts to
give preference to the most commonly executed blocks. */
-/* ??? The .da files are not safe. Changing the program after creating .da
- files or using different options when compiling with -fbranch-probabilities
- can result the arc data not matching the program. Maybe add instrumented
- arc count to .bbg file? Maybe check whether PFG matches the .bbg file? */
-
/* ??? Should calculate branch probabilities before instrumenting code, since
then we can use arc counts to help decide which arcs to instrument. */
#include "config.h"
#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
#include "rtl.h"
-#include "tree.h"
#include "flags.h"
-#include "insn-config.h"
#include "output.h"
#include "regs.h"
#include "expr.h"
#include "function.h"
#include "toplev.h"
-#include "ggc.h"
-#include "hard-reg-set.h"
-#include "basic-block.h"
-#include "gcov-io.h"
-#include "target.h"
-#include "profile.h"
-#include "libfuncs.h"
-#include "langhooks.h"
-
-/* Additional information about the edges we need. */
-struct edge_info
- {
- unsigned int count_valid : 1;
- unsigned int on_tree : 1;
- unsigned int ignore : 1;
- };
-struct bb_info
- {
- unsigned int count_valid : 1;
- gcov_type succ_count;
- gcov_type pred_count;
- };
-
-#define EDGE_INFO(e) ((struct edge_info *) (e)->aux)
-#define BB_INFO(b) ((struct bb_info *) (b)->aux)
-
-/* Keep all basic block indexes nonnegative in the gcov output. Index 0
- is used for entry block, last block exit block. */
-#define GCOV_INDEX_TO_BB(i) ((i) == 0 ? ENTRY_BLOCK_PTR \
- : (((i) == last_basic_block + 1) \
- ? EXIT_BLOCK_PTR : BASIC_BLOCK ((i)-1)))
-#define BB_TO_GCOV_INDEX(bb) ((bb) == ENTRY_BLOCK_PTR ? 0 \
- : ((bb) == EXIT_BLOCK_PTR \
- ? last_basic_block + 1 : (bb)->index + 1))
+#include "coverage.h"
+#include "value-prof.h"
+#include "tree.h"
+#include "cfghooks.h"
+#include "tree-flow.h"
+#include "timevar.h"
+#include "cfgloop.h"
+#include "tree-pass.h"
-/* Instantiate the profile info structure. */
+/* Hooks for profiling. */
+static struct profile_hooks* profile_hooks;
-struct profile_info profile_info;
+/* Additional information about the edges we need. */
+struct edge_info {
+ unsigned int count_valid : 1;
-/* Name and file pointer of the output file for the basic block graph. */
+ /* Is on the spanning tree. */
+ unsigned int on_tree : 1;
-static FILE *bbg_file;
+ /* Pretend this edge does not exist (it is abnormal and we've
+ inserted a fake to compensate). */
+ unsigned int ignore : 1;
+};
-/* Name and file pointer of the input file for the arc count data. */
+struct bb_info {
+ unsigned int count_valid : 1;
-static FILE *da_file;
+ /* Number of successor and predecessor edges. */
+ gcov_type succ_count;
+ gcov_type pred_count;
+};
-/* Pointer of the output file for the basic block/line number map. */
-static FILE *bb_file;
+#define EDGE_INFO(e) ((struct edge_info *) (e)->aux)
+#define BB_INFO(b) ((struct bb_info *) (b)->aux)
-/* Last source file name written to bb_file. */
+/* Counter summary from the last set of coverage counts read. */
-static char *last_bb_file_name;
+const struct gcov_ctr_summary *profile_info;
/* Collect statistics on the performance of this pass for the entire source
file. */
static int total_num_branches;
/* Forward declarations. */
-static void find_spanning_tree PARAMS ((struct edge_list *));
-static void init_edge_profiler PARAMS ((void));
-static rtx gen_edge_profiler PARAMS ((int));
-static void instrument_edges PARAMS ((struct edge_list *));
-static void output_gcov_string PARAMS ((const char *, long));
-static void compute_branch_probabilities PARAMS ((void));
-static gcov_type * get_exec_counts PARAMS ((void));
-static long compute_checksum PARAMS ((void));
-static basic_block find_group PARAMS ((basic_block));
-static void union_groups PARAMS ((basic_block, basic_block));
-
-/* If non-zero, we need to output a constructor to set up the
- per-object-file data. */
-static int need_func_profiler = 0;
+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.
NUM_BLOCKS is the number of basic blocks found in F. */
-static void
-instrument_edges (el)
- struct edge_list *el;
+static unsigned
+instrument_edges (struct edge_list *el)
{
- int num_instr_edges = 0;
+ unsigned num_instr_edges = 0;
int num_edges = NUM_EDGES (el);
basic_block bb;
- remove_fake_edges ();
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
{
- edge e = bb->succ;
- while (e)
+ edge e;
+ edge_iterator ei;
+
+ FOR_EACH_EDGE (e, ei, bb->succs)
{
struct edge_info *inf = EDGE_INFO (e);
+
if (!inf->ignore && !inf->on_tree)
{
- if (e->flags & EDGE_ABNORMAL)
- abort ();
- if (rtl_dump_file)
- fprintf (rtl_dump_file, "Edge %d to %d instrumented%s\n",
+ gcc_assert (!(e->flags & EDGE_ABNORMAL));
+ if (dump_file)
+ fprintf (dump_file, "Edge %d to %d instrumented%s\n",
e->src->index, e->dest->index,
EDGE_CRITICAL_P (e) ? " (and split)" : "");
- need_func_profiler = 1;
- insert_insn_on_edge (
- gen_edge_profiler (total_num_edges_instrumented
- + num_instr_edges++), e);
+ (profile_hooks->gen_edge_profiler) (num_instr_edges++, e);
}
- e = e->succ_next;
}
}
- profile_info.count_edges_instrumented_now = num_instr_edges;
- total_num_edges_instrumented += num_instr_edges;
- profile_info.count_instrumented_edges = total_num_edges_instrumented;
-
total_num_blocks_created += num_edges;
- if (rtl_dump_file)
- fprintf (rtl_dump_file, "%d edges instrumented\n", num_instr_edges);
-
- commit_edge_insertions_watch_calls ();
+ if (dump_file)
+ fprintf (dump_file, "%d edges instrumented\n", num_instr_edges);
+ return num_instr_edges;
}
-/* Output STRING to bb_file, surrounded by DELIMITER. */
-
+/* Add code to measure histograms for values in list VALUES. */
static void
-output_gcov_string (string, delimiter)
- const char *string;
- long delimiter;
+instrument_values (histogram_values values)
{
- long temp;
-
- /* Write a delimiter to indicate that a file name follows. */
- __write_long (delimiter, bb_file, 4);
-
- /* Write the string. */
- temp = strlen (string) + 1;
- fwrite (string, temp, 1, bb_file);
-
- /* Append a few zeros, to align the output to a 4 byte boundary. */
- temp = temp & 0x3;
- if (temp)
- {
- char c[4];
-
- c[0] = c[1] = c[2] = c[3] = 0;
- fwrite (c, sizeof (char), 4 - temp, bb_file);
- }
-
- /* Store another delimiter in the .bb file, just to make it easy to find
- the end of the file name. */
- __write_long (delimiter, bb_file, 4);
-}
-\f
-
-/* Computes hybrid profile for all matching entries in da_file.
- Sets max_counter_in_program as a side effect. */
-
-static gcov_type *
-get_exec_counts ()
-{
- int num_edges = 0;
- basic_block bb;
- int okay = 1, i;
- int mismatch = 0;
- gcov_type *profile;
- char *function_name_buffer;
- int function_name_buffer_len;
- gcov_type max_counter_in_run;
-
- profile_info.max_counter_in_program = 0;
- profile_info.count_profiles_merged = 0;
-
- /* No .da file, no execution counts. */
- if (!da_file)
- return 0;
-
- /* Count the edges to be (possibly) instrumented. */
-
- FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
- {
- edge e;
- for (e = bb->succ; e; e = e->succ_next)
- if (!EDGE_INFO (e)->ignore && !EDGE_INFO (e)->on_tree)
- num_edges++;
- }
-
- /* now read and combine all matching profiles. */
-
- profile = xmalloc (sizeof (gcov_type) * num_edges);
- rewind (da_file);
- function_name_buffer_len = strlen (current_function_name) + 1;
- function_name_buffer = xmalloc (function_name_buffer_len + 1);
+ unsigned i, t;
- for (i = 0; i < num_edges; i++)
- profile[i] = 0;
+ /* Emit code to generate the histograms before the insns. */
- while (1)
+ for (i = 0; i < VEC_length (histogram_value, values); i++)
{
- long magic, extra_bytes;
- long func_count;
- int i;
-
- if (__read_long (&magic, da_file, 4) != 0)
- break;
-
- if (magic != -123)
+ histogram_value hist = VEC_index (histogram_value, values, i);
+ switch (hist->type)
{
- okay = 0;
+ case HIST_TYPE_INTERVAL:
+ t = GCOV_COUNTER_V_INTERVAL;
break;
- }
- if (__read_long (&func_count, da_file, 4) != 0)
- {
- okay = 0;
+ case HIST_TYPE_POW2:
+ t = GCOV_COUNTER_V_POW2;
break;
- }
- if (__read_long (&extra_bytes, da_file, 4) != 0)
- {
- okay = 0;
+ case HIST_TYPE_SINGLE_VALUE:
+ t = GCOV_COUNTER_V_SINGLE;
break;
- }
- fseek (da_file, 4 + 8, SEEK_CUR);
-
- /* read the maximal counter. */
- __read_gcov_type (&max_counter_in_run, da_file, 8);
+ case HIST_TYPE_CONST_DELTA:
+ t = GCOV_COUNTER_V_DELTA;
+ break;
- /* skip the rest of "statistics" emited by __bb_exit_func. */
- fseek (da_file, extra_bytes - (4 + 8 + 8), SEEK_CUR);
+ default:
+ gcc_unreachable ();
+ }
+ if (!coverage_counter_alloc (t, hist->n_counters))
+ continue;
- for (i = 0; i < func_count; i++)
+ switch (hist->type)
{
- long arc_count;
- long chksum;
- int j;
+ case HIST_TYPE_INTERVAL:
+ (profile_hooks->gen_interval_profiler) (hist, t, 0);
+ break;
- if (__read_gcov_string
- (function_name_buffer, function_name_buffer_len, da_file,
- -1) != 0)
- {
- okay = 0;
- break;
- }
+ case HIST_TYPE_POW2:
+ (profile_hooks->gen_pow2_profiler) (hist, t, 0);
+ break;
- if (__read_long (&chksum, da_file, 4) != 0)
- {
- okay = 0;
- break;
- }
+ case HIST_TYPE_SINGLE_VALUE:
+ (profile_hooks->gen_one_value_profiler) (hist, t, 0);
+ break;
- if (__read_long (&arc_count, da_file, 4) != 0)
- {
- okay = 0;
- break;
- }
+ case HIST_TYPE_CONST_DELTA:
+ (profile_hooks->gen_const_delta_profiler) (hist, t, 0);
+ break;
- if (strcmp (function_name_buffer, current_function_name) != 0)
- {
- /* skip */
- if (fseek (da_file, arc_count * 8, SEEK_CUR) < 0)
- {
- okay = 0;
- break;
- }
- }
- else if (arc_count != num_edges
- || chksum != profile_info.current_function_cfg_checksum)
- okay = 0, mismatch = 1;
- else
- {
- gcov_type tmp;
+ default:
+ gcc_unreachable ();
+ }
+ }
+ VEC_free (histogram_value, heap, values);
+}
+\f
- profile_info.max_counter_in_program += max_counter_in_run;
- profile_info.count_profiles_merged++;
+/* Computes hybrid profile for all matching entries in da_file. */
- for (j = 0; j < arc_count; j++)
- if (__read_gcov_type (&tmp, da_file, 8) != 0)
- {
- okay = 0;
- break;
- }
- else
- {
- profile[j] += tmp;
- }
- }
- }
+static gcov_type *
+get_exec_counts (void)
+{
+ unsigned num_edges = 0;
+ basic_block bb;
+ gcov_type *counts;
- if (!okay)
- break;
+ /* Count the edges to be (possibly) instrumented. */
+ FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
+ {
+ edge e;
+ edge_iterator ei;
+ FOR_EACH_EDGE (e, ei, bb->succs)
+ if (!EDGE_INFO (e)->ignore && !EDGE_INFO (e)->on_tree)
+ num_edges++;
}
- free (function_name_buffer);
+ counts = get_coverage_counts (GCOV_COUNTER_ARCS, num_edges, &profile_info);
+ if (!counts)
+ return NULL;
- if (!okay)
- {
- if (mismatch)
- error
- ("Profile does not match flowgraph of function %s (out of date?)",
- current_function_name);
- else
- error (".da file corrupted");
- free (profile);
- return 0;
- }
- if (rtl_dump_file)
- {
- fprintf(rtl_dump_file, "Merged %i profiles with maximal count %i.\n",
- profile_info.count_profiles_merged,
- (int)profile_info.max_counter_in_program);
- }
+ if (dump_file && profile_info)
+ fprintf(dump_file, "Merged %u profiles with maximal count %u.\n",
+ profile_info->runs, (unsigned) profile_info->sum_max);
- return profile;
+ return counts;
}
\f
Annotate them accordingly. */
static void
-compute_branch_probabilities ()
+compute_branch_probabilities (void)
{
basic_block bb;
int i;
gcov_type *exec_counts = get_exec_counts ();
int exec_counts_pos = 0;
+ /* Very simple sanity checks so we catch bugs in our profiling code. */
+ if (profile_info)
+ {
+ if (profile_info->run_max * profile_info->runs < profile_info->sum_max)
+ {
+ error ("corrupted profile info: run_max * runs < sum_max");
+ exec_counts = NULL;
+ }
+
+ 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_info));
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
{
edge e;
+ edge_iterator ei;
- for (e = bb->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
if (!EDGE_INFO (e)->ignore)
BB_INFO (bb)->succ_count++;
- for (e = bb->pred; e; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, bb->preds)
if (!EDGE_INFO (e)->ignore)
BB_INFO (bb)->pred_count++;
}
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
{
edge e;
- for (e = bb->succ; e; e = e->succ_next)
+ edge_iterator ei;
+
+ FOR_EACH_EDGE (e, ei, bb->succs)
if (!EDGE_INFO (e)->ignore && !EDGE_INFO (e)->on_tree)
{
num_edges++;
if (exec_counts)
{
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);
+ }
}
else
e->count = 0;
EDGE_INFO (e)->count_valid = 1;
BB_INFO (bb)->succ_count--;
BB_INFO (e->dest)->pred_count--;
- if (rtl_dump_file)
+ if (dump_file)
{
- fprintf (rtl_dump_file, "\nRead edge from %i to %i, count:",
+ fprintf (dump_file, "\nRead edge from %i to %i, count:",
bb->index, e->dest->index);
- fprintf (rtl_dump_file, HOST_WIDEST_INT_PRINT_DEC,
+ fprintf (dump_file, HOST_WIDEST_INT_PRINT_DEC,
(HOST_WIDEST_INT) e->count);
}
}
}
- if (rtl_dump_file)
- fprintf (rtl_dump_file, "\n%d edge counts read\n", num_edges);
+ if (dump_file)
+ fprintf (dump_file, "\n%d edge counts read\n", num_edges);
/* For every block in the file,
- if every exit/entrance edge has a known count, then set the block count
if (bi->succ_count == 0)
{
edge e;
+ edge_iterator ei;
gcov_type total = 0;
- for (e = bb->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
total += e->count;
bb->count = total;
bi->count_valid = 1;
else if (bi->pred_count == 0)
{
edge e;
+ edge_iterator ei;
gcov_type total = 0;
- for (e = bb->pred; e; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, bb->preds)
total += e->count;
bb->count = total;
bi->count_valid = 1;
if (bi->succ_count == 1)
{
edge e;
+ edge_iterator ei;
gcov_type total = 0;
/* One of the counts will be invalid, but it is zero,
so adding it in also doesn't hurt. */
- for (e = bb->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
total += e->count;
/* Seedgeh for the invalid edge, and set its count. */
- for (e = bb->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
if (! EDGE_INFO (e)->count_valid && ! EDGE_INFO (e)->ignore)
break;
/* Calculate count for remaining edge by conservation. */
total = bb->count - total;
- if (! e)
- abort ();
+ gcc_assert (e);
EDGE_INFO (e)->count_valid = 1;
e->count = total;
bi->succ_count--;
if (bi->pred_count == 1)
{
edge e;
+ edge_iterator ei;
gcov_type total = 0;
/* One of the counts will be invalid, but it is zero,
so adding it in also doesn't hurt. */
- for (e = bb->pred; e; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, bb->preds)
total += e->count;
- /* Seedgeh for the invalid edge, and set its count. */
- for (e = bb->pred; e; e = e->pred_next)
- if (! EDGE_INFO (e)->count_valid && ! EDGE_INFO (e)->ignore)
+ /* Search for the invalid edge, and set its count. */
+ FOR_EACH_EDGE (e, ei, bb->preds)
+ if (!EDGE_INFO (e)->count_valid && !EDGE_INFO (e)->ignore)
break;
/* Calculate count for remaining edge by conservation. */
total = bb->count - total + e->count;
- if (! e)
- abort ();
+ gcc_assert (e);
EDGE_INFO (e)->count_valid = 1;
e->count = total;
bi->pred_count--;
}
}
}
- if (rtl_dump_file)
- dump_flow_info (rtl_dump_file);
+ if (dump_file)
+ dump_flow_info (dump_file, dump_flags);
total_num_passes += passes;
- if (rtl_dump_file)
- fprintf (rtl_dump_file, "Graph solving took %d passes.\n\n", passes);
+ if (dump_file)
+ fprintf (dump_file, "Graph solving took %d passes.\n\n", passes);
/* If the graph has been correctly solved, every block will have a
succ and pred count of zero. */
FOR_EACH_BB (bb)
{
- if (BB_INFO (bb)->succ_count || BB_INFO (bb)->pred_count)
- abort ();
+ gcc_assert (!BB_INFO (bb)->succ_count && !BB_INFO (bb)->pred_count);
}
/* For every edge, calculate its branch probability and add a reg_note
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
{
edge e;
- gcov_type total;
+ edge_iterator ei;
rtx note;
- total = bb->count;
- if (total)
+ if (bb->count < 0)
+ {
+ error ("corrupted profile info: number of iterations for basic block %d thought to be %i",
+ bb->index, (int)bb->count);
+ bb->count = 0;
+ }
+ FOR_EACH_EDGE (e, ei, bb->succs)
{
- for (e = bb->succ; e; e = e->succ_next)
+ /* Function may return twice in the cased the called function is
+ setjmp or calls fork, but we can't represent this by extra
+ edge from the entry, since extra edge from the exit is
+ already present. We get negative frequency from the entry
+ point. */
+ if ((e->count < 0
+ && e->dest == EXIT_BLOCK_PTR)
+ || (e->count > bb->count
+ && e->dest != EXIT_BLOCK_PTR))
{
- e->probability = (e->count * REG_BR_PROB_BASE + total / 2) / total;
- if (e->probability < 0 || e->probability > REG_BR_PROB_BASE)
- {
- error ("corrupted profile info: prob for %d-%d thought to be %d",
- e->src->index, e->dest->index, e->probability);
- e->probability = REG_BR_PROB_BASE / 2;
- }
+ if (block_ends_with_call_p (bb))
+ e->count = e->count < 0 ? 0 : bb->count;
}
- if (bb->index >= 0
- && any_condjump_p (bb->end)
- && bb->succ->succ_next)
+ if (e->count < 0 || e->count > bb->count)
+ {
+ error ("corrupted profile info: number of executions for edge %d-%d thought to be %i",
+ e->src->index, e->dest->index,
+ (int)e->count);
+ e->count = bb->count / 2;
+ }
+ }
+ if (bb->count)
+ {
+ FOR_EACH_EDGE (e, ei, bb->succs)
+ e->probability = (e->count * REG_BR_PROB_BASE + bb->count / 2) / bb->count;
+ if (bb->index >= NUM_FIXED_BLOCKS
+ && block_ends_with_condjump_p (bb)
+ && EDGE_COUNT (bb->succs) >= 2)
{
int prob;
edge e;
/* Find the branch edge. It is possible that we do have fake
edges here. */
- for (e = bb->succ; e->flags & (EDGE_FAKE | EDGE_FALLTHRU);
- e = e->succ_next)
- continue; /* Loop body has been intentionally left blank. */
+ FOR_EACH_EDGE (e, ei, bb->succs)
+ if (!(e->flags & (EDGE_FAKE | EDGE_FALLTHRU)))
+ break;
prob = e->probability;
index = prob * 20 / REG_BR_PROB_BASE;
index = 19;
hist_br_prob[index]++;
- note = find_reg_note (bb->end, REG_BR_PROB, 0);
- /* There may be already note put by some other pass, such
- as builtin_expect expander. */
- if (note)
- XEXP (note, 0) = GEN_INT (prob);
- else
- REG_NOTES (bb->end)
- = gen_rtx_EXPR_LIST (REG_BR_PROB, GEN_INT (prob),
- REG_NOTES (bb->end));
+ /* Do this for RTL only. */
+ if (!ir_type ())
+ {
+ note = find_reg_note (BB_END (bb), REG_BR_PROB, 0);
+ /* There may be already note put by some other pass, such
+ as builtin_expect expander. */
+ if (note)
+ XEXP (note, 0) = GEN_INT (prob);
+ else
+ REG_NOTES (BB_END (bb))
+ = gen_rtx_EXPR_LIST (REG_BR_PROB, GEN_INT (prob),
+ REG_NOTES (BB_END (bb)));
+ }
num_branches++;
}
}
- /* Otherwise distribute the probabilities evenly so we get sane sum.
- Use simple heuristics that if there are normal edges, give all abnormals
- frequency of 0, otherwise distribute the frequency over abnormals
- (this is the case of noreturn calls). */
- else
+ /* Otherwise try to preserve the existing REG_BR_PROB probabilities
+ tree based profile guessing put into code. BB can be the
+ ENTRY_BLOCK, and it can have multiple (fake) successors in
+ EH cases, but it still has no code; don't crash in this case. */
+ else if (profile_status == PROFILE_ABSENT
+ && !ir_type ()
+ && EDGE_COUNT (bb->succs) > 1
+ && BB_END (bb)
+ && (note = find_reg_note (BB_END (bb), REG_BR_PROB, 0)))
{
- for (e = bb->succ; e; e = e->succ_next)
+ int prob = INTVAL (XEXP (note, 0));
+
+ BRANCH_EDGE (bb)->probability = prob;
+ FALLTHRU_EDGE (bb)->probability = REG_BR_PROB_BASE - prob;
+ }
+ /* As a last resort, distribute the probabilities evenly.
+ Use simple heuristics that if there are normal edges,
+ 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)
+ {
+ int total = 0;
+
+ FOR_EACH_EDGE (e, ei, bb->succs)
if (!(e->flags & (EDGE_COMPLEX | EDGE_FAKE)))
total ++;
if (total)
{
- for (e = bb->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
if (!(e->flags & (EDGE_COMPLEX | EDGE_FAKE)))
e->probability = REG_BR_PROB_BASE / total;
else
}
else
{
- for (e = bb->succ; e; e = e->succ_next)
- total ++;
- for (e = bb->succ; e; e = e->succ_next)
+ total += EDGE_COUNT (bb->succs);
+ FOR_EACH_EDGE (e, ei, bb->succs)
e->probability = REG_BR_PROB_BASE / total;
}
- if (bb->index >= 0
- && any_condjump_p (bb->end)
- && bb->succ->succ_next)
+ if (bb->index >= NUM_FIXED_BLOCKS
+ && block_ends_with_condjump_p (bb)
+ && EDGE_COUNT (bb->succs) >= 2)
num_branches++, num_never_executed;
}
}
+ counts_to_freqs ();
- if (rtl_dump_file)
+ if (dump_file)
{
- fprintf (rtl_dump_file, "%d branches\n", num_branches);
- fprintf (rtl_dump_file, "%d branches never executed\n",
+ 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 (rtl_dump_file, "%d%% branches in range %d-%d%%\n",
+ fprintf (dump_file, "%d%% branches in range %d-%d%%\n",
(hist_br_prob[i] + hist_br_prob[19-i]) * 100 / num_branches,
5 * i, 5 * i + 5);
for (i = 0; i < 20; i++)
total_hist_br_prob[i] += hist_br_prob[i];
- fputc ('\n', rtl_dump_file);
- fputc ('\n', rtl_dump_file);
+ fputc ('\n', dump_file);
+ fputc ('\n', dump_file);
}
free_aux_for_blocks ();
- if (exec_counts)
- free (exec_counts);
}
-/* Compute checksum for the current function. */
+/* Load value histograms values whose description is stored in VALUES array
+ from .gcda file. */
-#define CHSUM_HASH 500000003
-#define CHSUM_SHIFT 2
-
-static long
-compute_checksum ()
+static void
+compute_value_histograms (histogram_values values)
{
- long chsum = 0;
- basic_block bb;
-
- FOR_EACH_BB (bb)
+ 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;
+
+ for (t = 0; t < GCOV_N_VALUE_COUNTERS; t++)
+ n_histogram_counters[t] = 0;
+
+ for (i = 0; i < VEC_length (histogram_value, values); i++)
{
- edge e;
+ histogram_value hist = VEC_index (histogram_value, values, i);
+ n_histogram_counters[(int) hist->type] += hist->n_counters;
+ }
- for (e = bb->succ; e; e = e->succ_next)
+ any = 0;
+ for (t = 0; t < GCOV_N_VALUE_COUNTERS; t++)
+ {
+ if (!n_histogram_counters[t])
{
- chsum = ((chsum << CHSUM_SHIFT) + (BB_TO_GCOV_INDEX (e->dest) + 1)) % CHSUM_HASH;
+ histogram_counts[t] = NULL;
+ continue;
}
- chsum = (chsum << CHSUM_SHIFT) % CHSUM_HASH;
+ histogram_counts[t] =
+ get_coverage_counts (COUNTER_FOR_HIST_TYPE (t),
+ n_histogram_counters[t], 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++)
+ {
+ histogram_value hist = VEC_index (histogram_value, values, i);
+ tree stmt = hist->hvalue.stmt;
+ stmt_ann_t ann = get_stmt_ann (stmt);
+
+ t = (int) hist->type;
+
+ aact_count = act_count[t];
+ act_count[t] += hist->n_counters;
+
+ hist->hvalue.next = ann->histograms;
+ ann->histograms = 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];
}
- return chsum;
+ for (t = 0; t < GCOV_N_VALUE_COUNTERS; t++)
+ if (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. */
+static void
+output_location (char const *file_name, int line,
+ gcov_position_t *offset, basic_block bb)
+{
+ static char const *prev_file_name;
+ static int prev_line;
+ bool name_differs, line_differs;
+
+ if (!file_name)
+ {
+ prev_file_name = NULL;
+ prev_line = -1;
+ return;
+ }
+
+ name_differs = !prev_file_name || strcmp (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));
+ name_differs = line_differs=true;
+ }
+
+ /* If this is a new source file, then output the
+ file's name to the .bb file. */
+ if (name_differs)
+ {
+ prev_file_name = file_name;
+ gcov_write_unsigned (0);
+ gcov_write_string (prev_file_name);
+ }
+ if (line_differs)
+ {
+ gcov_write_unsigned (line);
+ prev_line = line;
+ }
+ }
}
/* Instrument and/or analyze program behavior based on program flow graph.
Main entry point of this file. */
void
-branch_prob ()
+branch_prob (void)
{
basic_block bb;
- int i;
- int num_edges, ignored_edges;
+ unsigned i;
+ unsigned num_edges, ignored_edges;
+ unsigned num_instrumented;
struct edge_list *el;
-
- profile_info.current_function_cfg_checksum = compute_checksum ();
-
- if (rtl_dump_file)
- fprintf (rtl_dump_file, "CFG checksum is %ld\n",
- profile_info.current_function_cfg_checksum);
-
- /* Start of a function. */
- if (flag_test_coverage)
- output_gcov_string (current_function_name, (long) -2);
+ histogram_values values = NULL;
total_num_times_called++;
{
int need_exit_edge = 0, need_entry_edge = 0;
int have_exit_edge = 0, have_entry_edge = 0;
- rtx insn;
edge e;
+ edge_iterator ei;
+
+ /* Functions returning multiple times are not handled by extra edges.
+ Instead we simply allow negative counts on edges from exit to the
+ block past call and corresponding probabilities. We can't go
+ with the extra edges because that would result in flowgraph that
+ needs to have fake edges outside the spanning tree. */
- /* Add fake edges from entry block to the call insns that may return
- twice. The CFG is not quite correct then, as call insn plays more
- role of CODE_LABEL, but for our purposes, everything should be OK,
- as we never insert code to the beggining of basic block. */
- for (insn = bb->head; insn != NEXT_INSN (bb->end);
- insn = NEXT_INSN (insn))
+ FOR_EACH_EDGE (e, ei, bb->succs)
{
- if (GET_CODE (insn) == CALL_INSN
- && find_reg_note (insn, REG_SETJMP, NULL))
+ block_stmt_iterator bsi;
+ tree 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))
{
- if (GET_CODE (bb->head) == CODE_LABEL
- || insn != NEXT_INSN (bb->head))
- {
- e = split_block (bb, PREV_INSN (insn));
- make_edge (ENTRY_BLOCK_PTR, e->dest, EDGE_FAKE);
- break;
- }
- else
- {
- /* We should not get abort here, as call to setjmp should not
- be the very first instruction of function. */
- if (bb == ENTRY_BLOCK_PTR)
- abort ();
- make_edge (ENTRY_BLOCK_PTR, bb, EDGE_FAKE);
- }
+ last = bsi_stmt (bsi);
+ if (EXPR_LOCUS (last))
+ break;
}
- }
- for (e = bb->succ; e; e = e->succ_next)
- {
+ /* 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
+ if (blah) goto something;
+ is not computed twice. */
+ if (last && EXPR_LOCUS (last)
+ && e->goto_locus
+ && !single_succ_p (bb)
+#ifdef USE_MAPPED_LOCATION
+ && (LOCATION_FILE (e->goto_locus)
+ != LOCATION_FILE (EXPR_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
+ {
+ basic_block new = split_edge (e);
+ single_succ_edge (new)->goto_locus = e->goto_locus;
+ }
if ((e->flags & (EDGE_ABNORMAL | EDGE_ABNORMAL_CALL))
&& e->dest != EXIT_BLOCK_PTR)
need_exit_edge = 1;
if (e->dest == EXIT_BLOCK_PTR)
have_exit_edge = 1;
}
- for (e = bb->pred; e; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, bb->preds)
{
if ((e->flags & (EDGE_ABNORMAL | EDGE_ABNORMAL_CALL))
&& e->src != ENTRY_BLOCK_PTR)
if (need_exit_edge && !have_exit_edge)
{
- if (rtl_dump_file)
- fprintf (rtl_dump_file, "Adding fake exit edge to bb %i\n",
+ if (dump_file)
+ fprintf (dump_file, "Adding fake exit edge to bb %i\n",
bb->index);
make_edge (bb, EXIT_BLOCK_PTR, EDGE_FAKE);
}
if (need_entry_edge && !have_entry_edge)
{
- if (rtl_dump_file)
- fprintf (rtl_dump_file, "Adding fake entry edge to bb %i\n",
+ if (dump_file)
+ fprintf (dump_file, "Adding fake entry edge to bb %i\n",
bb->index);
make_edge (ENTRY_BLOCK_PTR, bb, EDGE_FAKE);
}
}
}
-#ifdef ENABLE_CHECKING
- verify_flow_info ();
-#endif
-
- /* Output line number information about each basic block for
- GCOV utility. */
- if (flag_test_coverage)
- {
- FOR_EACH_BB (bb)
- {
- rtx insn = bb->head;
- static int ignore_next_note = 0;
-
- /* We are looking for line number notes. Search backward before
- basic block to find correct ones. */
- insn = prev_nonnote_insn (insn);
- if (!insn)
- insn = get_insns ();
- else
- insn = NEXT_INSN (insn);
-
- /* Output a zero to the .bb file to indicate that a new
- block list is starting. */
- __write_long (0, bb_file, 4);
-
- while (insn != bb->end)
- {
- if (GET_CODE (insn) == NOTE)
- {
- /* Must ignore the line number notes that immediately
- follow the end of an inline function to avoid counting
- it twice. There is a note before the call, and one
- after the call. */
- if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_REPEATED_LINE_NUMBER)
- ignore_next_note = 1;
- else if (NOTE_LINE_NUMBER (insn) > 0)
- {
- if (ignore_next_note)
- ignore_next_note = 0;
- else
- {
- /* If this is a new source file, then output the
- file's name to the .bb file. */
- if (! last_bb_file_name
- || strcmp (NOTE_SOURCE_FILE (insn),
- last_bb_file_name))
- {
- if (last_bb_file_name)
- free (last_bb_file_name);
- last_bb_file_name
- = xstrdup (NOTE_SOURCE_FILE (insn));
- output_gcov_string (NOTE_SOURCE_FILE (insn),
- (long)-1);
- }
- /* Output the line number to the .bb file. Must be
- done after the output_bb_profile_data() call, and
- after the file name is written, to ensure that it
- is correctly handled by gcov. */
- __write_long (NOTE_LINE_NUMBER (insn), bb_file, 4);
- }
- }
- }
- insn = NEXT_INSN (insn);
- }
- }
- __write_long (0, bb_file, 4);
- }
-
/* Create spanning tree from basic block graph, mark each edge that is
on the spanning tree. We insert as many abnormal and critical edges
as possible to minimize number of edge splits necessary. */
/* Fake edges that are not on the tree will not be instrumented, so
mark them ignored. */
- for (i = 0; i < num_edges; i++)
+ for (num_instrumented = i = 0; i < num_edges; i++)
{
edge e = INDEX_EDGE (el, i);
struct edge_info *inf = EDGE_INFO (e);
- if ((e->flags & EDGE_FAKE) && !inf->ignore && !inf->on_tree)
+
+ if (inf->ignore || inf->on_tree)
+ /*NOP*/;
+ else if (e->flags & EDGE_FAKE)
{
inf->ignore = 1;
ignored_edges++;
}
+ else
+ num_instrumented++;
}
- total_num_blocks += n_basic_blocks + 2;
- if (rtl_dump_file)
- fprintf (rtl_dump_file, "%d basic blocks\n", n_basic_blocks);
+ total_num_blocks += n_basic_blocks;
+ if (dump_file)
+ fprintf (dump_file, "%d basic blocks\n", n_basic_blocks);
total_num_edges += num_edges;
- if (rtl_dump_file)
- fprintf (rtl_dump_file, "%d edges\n", num_edges);
+ if (dump_file)
+ fprintf (dump_file, "%d edges\n", num_edges);
total_num_edges_ignored += ignored_edges;
- if (rtl_dump_file)
- fprintf (rtl_dump_file, "%d ignored edges\n", ignored_edges);
+ if (dump_file)
+ fprintf (dump_file, "%d ignored edges\n", ignored_edges);
- /* Create a .bbg file from which gcov can reconstruct the basic block
- graph. First output the number of basic blocks, and then for every
- edge output the source and target basic block numbers.
- NOTE: The format of this file must be compatible with gcov. */
+ /* Write the data from which gcov can reconstruct the basic block
+ graph. */
- if (flag_test_coverage)
+ /* Basic block flags */
+ if (coverage_begin_output ())
{
- int flag_bits;
+ gcov_position_t offset;
- __write_gcov_string (current_function_name,
- strlen (current_function_name), bbg_file, -1);
+ offset = gcov_write_tag (GCOV_TAG_BLOCKS);
+ for (i = 0; i != (unsigned) (n_basic_blocks); i++)
+ gcov_write_unsigned (0);
+ gcov_write_length (offset);
+ }
- /* write checksum. */
- __write_long (profile_info.current_function_cfg_checksum, bbg_file, 4);
+ /* 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;
- /* The plus 2 stands for entry and exit block. */
- __write_long (n_basic_blocks + 2, bbg_file, 4);
- __write_long (num_edges - ignored_edges + 1, bbg_file, 4);
+ /* Arcs */
+ if (coverage_begin_output ())
+ {
+ gcov_position_t offset;
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, EXIT_BLOCK_PTR, next_bb)
{
edge e;
- long count = 0;
+ edge_iterator ei;
- for (e = bb->succ; e; e = e->succ_next)
- if (!EDGE_INFO (e)->ignore)
- count++;
- __write_long (count, bbg_file, 4);
+ offset = gcov_write_tag (GCOV_TAG_ARCS);
+ gcov_write_unsigned (BB_TO_GCOV_INDEX (bb));
- for (e = bb->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
{
struct edge_info *i = EDGE_INFO (e);
if (!i->ignore)
{
- flag_bits = 0;
+ unsigned flag_bits = 0;
+
if (i->on_tree)
- flag_bits |= 0x1;
+ flag_bits |= GCOV_ARC_ON_TREE;
if (e->flags & EDGE_FAKE)
- flag_bits |= 0x2;
+ flag_bits |= GCOV_ARC_FAKE;
if (e->flags & EDGE_FALLTHRU)
- flag_bits |= 0x4;
-
- __write_long (BB_TO_GCOV_INDEX (e->dest), bbg_file, 4);
- __write_long (flag_bits, bbg_file, 4);
+ flag_bits |= GCOV_ARC_FALLTHROUGH;
+ /* On trees we don't have fallthru flags, but we can
+ recompute them from CFG shape. */
+ if (ir_type ()
+ && e->flags & (EDGE_TRUE_VALUE | EDGE_FALSE_VALUE)
+ && e->src->next_bb == e->dest)
+ flag_bits |= GCOV_ARC_FALLTHROUGH;
+
+ gcov_write_unsigned (BB_TO_GCOV_INDEX (e->dest));
+ gcov_write_unsigned (flag_bits);
}
}
+
+ gcov_write_length (offset);
}
- /* Emit fake loopback edge for EXIT block to maintain compatibility with
- old gcov format. */
- __write_long (1, bbg_file, 4);
- __write_long (0, bbg_file, 4);
- __write_long (0x1, bbg_file, 4);
-
- /* Emit a -1 to separate the list of all edges from the list of
- loop back edges that follows. */
- __write_long (-1, bbg_file, 4);
}
- if (flag_branch_probabilities)
- compute_branch_probabilities ();
+ /* Line numbers. */
+ if (coverage_begin_output ())
+ {
+ /* Initialize the output. */
+ output_location (NULL, 0, NULL, NULL);
+
+ if (!ir_type ())
+ {
+ gcov_position_t offset;
+
+ FOR_EACH_BB (bb)
+ {
+ rtx insn = BB_HEAD (bb);
+ int ignore_next_note = 0;
- /* For each edge not on the spanning tree, add counting code as rtl. */
+ offset = 0;
- if (profile_arc_flag)
+ /* We are looking for line number notes. Search backward
+ before basic block to find correct ones. */
+ insn = prev_nonnote_insn (insn);
+ if (!insn)
+ insn = get_insns ();
+ else
+ insn = NEXT_INSN (insn);
+
+ while (insn != BB_END (bb))
+ {
+ if (NOTE_P (insn))
+ {
+ /* Must ignore the line number notes that
+ immediately follow the end of an inline function
+ to avoid counting it twice. There is a note
+ before the call, and one after the call. */
+ if (NOTE_LINE_NUMBER (insn)
+ == NOTE_INSN_REPEATED_LINE_NUMBER)
+ ignore_next_note = 1;
+ else if (NOTE_LINE_NUMBER (insn) <= 0)
+ /*NOP*/;
+ else if (ignore_next_note)
+ ignore_next_note = 0;
+ else
+ {
+ expanded_location s;
+ NOTE_EXPANDED_LOCATION (s, insn);
+ output_location (s.file, s.line, &offset, bb);
+ }
+ }
+ insn = NEXT_INSN (insn);
+ }
+
+ if (offset)
+ {
+ /* A file of NULL indicates the end of run. */
+ gcov_write_unsigned (0);
+ gcov_write_string (NULL);
+ gcov_write_length (offset);
+ }
+ }
+ }
+ else
+ {
+ gcov_position_t offset;
+
+ FOR_EACH_BB (bb)
+ {
+ block_stmt_iterator bsi;
+
+ offset = 0;
+
+ if (bb == ENTRY_BLOCK_PTR->next_bb)
+ {
+ 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))
+ {
+ tree stmt = bsi_stmt (bsi);
+ if (EXPR_HAS_LOCATION (stmt))
+ output_location (EXPR_FILENAME (stmt),
+ EXPR_LINENO (stmt),
+ &offset, bb);
+ }
+
+ /* Notice GOTO expressions we eliminated while constructing the
+ CFG. */
+ if (single_succ_p (bb) && single_succ_edge (bb)->goto_locus)
+ {
+ /* ??? 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,
+ &offset, bb);
+#endif
+ }
+
+ if (offset)
+ {
+ /* A file of NULL indicates the end of run. */
+ gcov_write_unsigned (0);
+ gcov_write_string (NULL);
+ gcov_write_length (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);
+
+ if (flag_branch_probabilities)
{
- instrument_edges (el);
- allocate_reg_info (max_reg_num (), FALSE, FALSE);
+ compute_branch_probabilities ();
+ if (flag_profile_values)
+ compute_value_histograms (values);
}
remove_fake_edges ();
- /* Re-merge split basic blocks and the mess introduced by
- insert_insn_on_edge. */
- cleanup_cfg (profile_arc_flag ? CLEANUP_EXPENSIVE : 0);
- if (rtl_dump_file)
- dump_flow_info (rtl_dump_file);
+
+ /* For each edge not on the spanning tree, add counting code. */
+ if (profile_arc_flag
+ && coverage_counter_alloc (GCOV_COUNTER_ARCS, num_instrumented))
+ {
+ unsigned n_instrumented;
+
+ profile_hooks->init_edge_profiler ();
+
+ n_instrumented = instrument_edges (el);
+
+ gcc_assert (n_instrumented == num_instrumented);
+
+ if (flag_profile_values)
+ instrument_values (values);
+
+ /* Commit changes done by instrumentation. */
+ if (ir_type ())
+ bsi_commit_edge_inserts ();
+ else
+ {
+ commit_edge_insertions_watch_calls ();
+ allocate_reg_info (max_reg_num (), FALSE, FALSE);
+ }
+ }
free_aux_for_edges ();
+
+ if (!ir_type ())
+ {
+ /* Re-merge split basic blocks and the mess introduced by
+ insert_insn_on_edge. */
+ cleanup_cfg (profile_arc_flag ? CLEANUP_EXPENSIVE : 0);
+ if (dump_file)
+ dump_flow_info (dump_file, dump_flags);
+ }
+
free_edge_list (el);
+ if (flag_branch_probabilities)
+ profile_status = PROFILE_READ;
+ coverage_end_function ();
}
\f
/* Union find algorithm implementation for the basic blocks using
aux fields. */
static basic_block
-find_group (bb)
- basic_block bb;
+find_group (basic_block bb)
{
basic_block group = bb, bb1;
}
static void
-union_groups (bb1, bb2)
- basic_block bb1, bb2;
+union_groups (basic_block bb1, basic_block bb2)
{
basic_block bb1g = find_group (bb1);
basic_block bb2g = find_group (bb2);
/* ??? I don't have a place for the rank field. OK. Lets go w/o it,
this code is unlikely going to be performance problem anyway. */
- if (bb1g == bb2g)
- abort ();
+ gcc_assert (bb1g != bb2g);
bb1g->aux = bb2g;
}
/* This function searches all of the edges in the program flow graph, and puts
as many bad edges as possible onto the spanning tree. Bad edges include
abnormals edges, which can't be instrumented at the moment. Since it is
- possible for fake edges to form an cycle, we will have to develop some
+ possible for fake edges to form a cycle, we will have to develop some
better way in the future. Also put critical edges to the tree, since they
are more expensive to instrument. */
static void
-find_spanning_tree (el)
- struct edge_list *el;
+find_spanning_tree (struct edge_list *el)
{
int i;
int num_edges = NUM_EDGES (el);
/* Add fake edge exit to entry we can't instrument. */
union_groups (EXIT_BLOCK_PTR, ENTRY_BLOCK_PTR);
- /* First add all abnormal edges to the tree unless they form an cycle. Also
+ /* 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
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)
&& !EDGE_INFO (e)->ignore
&& (find_group (e->src) != find_group (e->dest)))
{
- if (rtl_dump_file)
- fprintf (rtl_dump_file, "Abnormal edge %d to %d put to tree\n",
+ if (dump_file)
+ fprintf (dump_file, "Abnormal edge %d to %d put to tree\n",
e->src->index, e->dest->index);
EDGE_INFO (e)->on_tree = 1;
union_groups (e->src, e->dest);
}
}
- /* Now insert all critical edges to the tree unless they form an cycle. */
+ /* Now insert all critical edges to the tree unless they form a cycle. */
for (i = 0; i < num_edges; i++)
{
edge e = INDEX_EDGE (el, i);
- if ((EDGE_CRITICAL_P (e))
- && !EDGE_INFO (e)->ignore
- && (find_group (e->src) != find_group (e->dest)))
+ if (EDGE_CRITICAL_P (e) && !EDGE_INFO (e)->ignore
+ && find_group (e->src) != find_group (e->dest))
{
- if (rtl_dump_file)
- fprintf (rtl_dump_file, "Critical edge %d to %d put to tree\n",
+ if (dump_file)
+ fprintf (dump_file, "Critical edge %d to %d put to tree\n",
e->src->index, e->dest->index);
EDGE_INFO (e)->on_tree = 1;
union_groups (e->src, e->dest);
for (i = 0; i < num_edges; i++)
{
edge e = INDEX_EDGE (el, i);
- if (find_group (e->src) != find_group (e->dest)
- && !EDGE_INFO (e)->ignore)
+ if (!EDGE_INFO (e)->ignore
+ && find_group (e->src) != find_group (e->dest))
{
- if (rtl_dump_file)
- fprintf (rtl_dump_file, "Normal edge %d to %d put to tree\n",
+ if (dump_file)
+ fprintf (dump_file, "Normal edge %d to %d put to tree\n",
e->src->index, e->dest->index);
EDGE_INFO (e)->on_tree = 1;
union_groups (e->src, e->dest);
/* Perform file-level initialization for branch-prob processing. */
void
-init_branch_prob (filename)
- const char *filename;
+init_branch_prob (void)
{
- long len;
int i;
- if (flag_test_coverage)
- {
- int len = strlen (filename);
- char *data_file, *bbg_file_name;
-
- /* Open an output file for the basic block/line number map. */
- data_file = (char *) alloca (len + 4);
- strcpy (data_file, filename);
- strip_off_ending (data_file, len);
- strcat (data_file, ".bb");
- if ((bb_file = fopen (data_file, "wb")) == 0)
- fatal_io_error ("can't open %s", data_file);
-
- /* Open an output file for the program flow graph. */
- bbg_file_name = (char *) alloca (len + 5);
- strcpy (bbg_file_name, filename);
- strip_off_ending (bbg_file_name, len);
- strcat (bbg_file_name, ".bbg");
- if ((bbg_file = fopen (bbg_file_name, "wb")) == 0)
- fatal_io_error ("can't open %s", bbg_file_name);
-
- /* Initialize to zero, to ensure that the first file name will be
- written to the .bb file. */
- last_bb_file_name = 0;
- }
-
- if (flag_branch_probabilities)
- {
- char *da_file_name;
-
- len = strlen (filename);
- da_file_name = (char *) alloca (len + 4);
- strcpy (da_file_name, filename);
- strip_off_ending (da_file_name, len);
- strcat (da_file_name, ".da");
- if ((da_file = fopen (da_file_name, "rb")) == 0)
- warning ("file %s not found, execution counts assumed to be zero",
- da_file_name);
- }
-
- if (profile_arc_flag)
- init_edge_profiler ();
-
total_num_blocks = 0;
total_num_edges = 0;
total_num_edges_ignored = 0;
is completed. */
void
-end_branch_prob ()
+end_branch_prob (void)
{
- if (flag_test_coverage)
+ if (dump_file)
{
- fclose (bb_file);
- fclose (bbg_file);
- }
-
- if (flag_branch_probabilities && da_file)
- fclose (da_file);
-
- if (rtl_dump_file)
- {
- fprintf (rtl_dump_file, "\n");
- fprintf (rtl_dump_file, "Total number of blocks: %d\n",
+ fprintf (dump_file, "\n");
+ fprintf (dump_file, "Total number of blocks: %d\n",
total_num_blocks);
- fprintf (rtl_dump_file, "Total number of edges: %d\n", total_num_edges);
- fprintf (rtl_dump_file, "Total number of ignored edges: %d\n",
+ fprintf (dump_file, "Total number of edges: %d\n", total_num_edges);
+ fprintf (dump_file, "Total number of ignored edges: %d\n",
total_num_edges_ignored);
- fprintf (rtl_dump_file, "Total number of instrumented edges: %d\n",
+ fprintf (dump_file, "Total number of instrumented edges: %d\n",
total_num_edges_instrumented);
- fprintf (rtl_dump_file, "Total number of blocks created: %d\n",
+ fprintf (dump_file, "Total number of blocks created: %d\n",
total_num_blocks_created);
- fprintf (rtl_dump_file, "Total number of graph solution passes: %d\n",
+ fprintf (dump_file, "Total number of graph solution passes: %d\n",
total_num_passes);
if (total_num_times_called != 0)
- fprintf (rtl_dump_file, "Average number of graph solution passes: %d\n",
+ fprintf (dump_file, "Average number of graph solution passes: %d\n",
(total_num_passes + (total_num_times_called >> 1))
/ total_num_times_called);
- fprintf (rtl_dump_file, "Total number of branches: %d\n",
+ fprintf (dump_file, "Total number of branches: %d\n",
total_num_branches);
- fprintf (rtl_dump_file, "Total number of branches never executed: %d\n",
+ fprintf (dump_file, "Total number of branches never executed: %d\n",
total_num_never_executed);
if (total_num_branches)
{
int i;
for (i = 0; i < 10; i++)
- fprintf (rtl_dump_file, "%d%% branches in range %d-%d%%\n",
+ fprintf (dump_file, "%d%% branches in range %d-%d%%\n",
(total_hist_br_prob[i] + total_hist_br_prob[19-i]) * 100
/ total_num_branches, 5*i, 5*i+5);
}
}
}
-\f
-/* The label used by the edge profiling code. */
-
-static rtx profiler_label;
-/* Initialize the profiler_label. */
+/* Set up hooks to enable tree-based profiling. */
-static void
-init_edge_profiler ()
+void
+tree_register_profile_hooks (void)
{
- /* Generate and save a copy of this so it can be shared. */
- char buf[20];
- ASM_GENERATE_INTERNAL_LABEL (buf, "LPBX", 2);
- profiler_label = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (buf));
- ggc_add_rtx_root (&profiler_label, 1);
+ gcc_assert (ir_type ());
+ profile_hooks = &tree_profile_hooks;
}
-/* Output instructions as RTL to increment the edge execution count. */
-
-static rtx
-gen_edge_profiler (edgeno)
- int edgeno;
+\f
+/* Do branch profiling and static profile estimation passes. */
+static void
+rest_of_handle_branch_prob (void)
{
- enum machine_mode mode = mode_for_size (GCOV_TYPE_SIZE, MODE_INT, 0);
- rtx mem_ref, tmp;
- rtx sequence;
-
- start_sequence ();
+ struct loops loops;
- tmp = force_reg (Pmode, profiler_label);
- tmp = plus_constant (tmp, GCOV_TYPE_SIZE / BITS_PER_UNIT * edgeno);
- mem_ref = validize_mem (gen_rtx_MEM (mode, tmp));
+ /* Discover and record the loop depth at the head of each basic
+ block. The loop infrastructure does the real job for us. */
+ flow_loops_find (&loops);
- set_mem_alias_set (mem_ref, new_alias_set ());
+ if (dump_file)
+ flow_loops_dump (&loops, dump_file, NULL, 0);
- tmp = expand_simple_binop (mode, PLUS, mem_ref, const1_rtx,
- mem_ref, 0, OPTAB_WIDEN);
+ /* Estimate using heuristics if no profiling info is available. */
+ if (flag_guess_branch_prob
+ && profile_status == PROFILE_ABSENT)
+ estimate_probability (&loops);
- if (tmp != mem_ref)
- emit_move_insn (copy_rtx (mem_ref), tmp);
-
- sequence = gen_sequence ();
- end_sequence ();
- return sequence;
+ flow_loops_free (&loops);
+ free_dominance_info (CDI_DOMINATORS);
}
-/* Output code for a constructor that will invoke __bb_init_func, if
- this has not already been done. */
-
-void
-output_func_start_profiler ()
+struct tree_opt_pass pass_branch_prob =
{
- tree fnname, fndecl;
- char *name;
- char buf[20];
- const char *cfnname;
- rtx table_address;
- enum machine_mode mode = mode_for_size (GCOV_TYPE_SIZE, MODE_INT, 0);
- int save_flag_inline_functions = flag_inline_functions;
-
- /* It's either already been output, or we don't need it because we're
- not doing profile-edges. */
- if (! need_func_profiler)
- return;
-
- need_func_profiler = 0;
-
- /* Synthesize a constructor function to invoke __bb_init_func with a
- pointer to this object file's profile block. */
-
- /* Try and make a unique name given the "file function name".
-
- And no, I don't like this either. */
-
- fnname = get_file_function_name ('I');
- cfnname = IDENTIFIER_POINTER (fnname);
- name = concat (cfnname, "GCOV", NULL);
- fnname = get_identifier (name);
- free (name);
-
- fndecl = build_decl (FUNCTION_DECL, fnname,
- build_function_type (void_type_node, NULL_TREE));
- DECL_EXTERNAL (fndecl) = 0;
+ "bp", /* name */
+ NULL, /* gate */
+ rest_of_handle_branch_prob, /* execute */
+ NULL, /* sub */
+ NULL, /* next */
+ 0, /* static_pass_number */
+ TV_BRANCH_PROB, /* tv_id */
+ 0, /* properties_required */
+ 0, /* properties_provided */
+ 0, /* properties_destroyed */
+ 0, /* todo_flags_start */
+ TODO_dump_func, /* todo_flags_finish */
+ 'b' /* letter */
+};
- /* It can be a static function as long as collect2 does not have
- to scan the object file to find its ctor/dtor routine. */
- TREE_PUBLIC (fndecl) = ! targetm.have_ctors_dtors;
- TREE_USED (fndecl) = 1;
- DECL_RESULT (fndecl) = build_decl (RESULT_DECL, NULL_TREE, void_type_node);
-
- fndecl = (*lang_hooks.decls.pushdecl) (fndecl);
- rest_of_decl_compilation (fndecl, 0, 1, 0);
- announce_function (fndecl);
- current_function_decl = fndecl;
- DECL_INITIAL (fndecl) = error_mark_node;
- make_decl_rtl (fndecl, NULL);
- init_function_start (fndecl, input_filename, lineno);
- (*lang_hooks.decls.pushlevel) (0);
- expand_function_start (fndecl, 0);
- cfun->arc_profile = 0;
-
- /* Actually generate the code to call __bb_init_func. */
- ASM_GENERATE_INTERNAL_LABEL (buf, "LPBX", 0);
- table_address = force_reg (Pmode,
- gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (buf)));
- emit_library_call (gen_rtx_SYMBOL_REF (Pmode, "__bb_init_func"), LCT_NORMAL,
- mode, 1, table_address, Pmode);
-
- expand_function_end (input_filename, lineno, 0);
- (*lang_hooks.decls.poplevel) (1, 0, 1);
-
- /* Since fndecl isn't in the list of globals, it would never be emitted
- when it's considered to be 'safe' for inlining, so turn off
- flag_inline_functions. */
- flag_inline_functions = 0;
-
- rest_of_compilation (fndecl);
-
- /* Reset flag_inline_functions to its original value. */
- flag_inline_functions = save_flag_inline_functions;
-
- if (! quiet_flag)
- fflush (asm_out_file);
- current_function_decl = NULL_TREE;
-
- if (targetm.have_ctors_dtors)
- (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
- DEFAULT_INIT_PRIORITY);
-}
OSDN Git Service
