/* Calculate branch probabilities, and basic block execution counts.
Copyright (C) 1990, 1991, 1992, 1993, 1994, 1996, 1997, 1998, 1999,
- 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+ 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ 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, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, 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
- 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 file generated is <dumpbase>.bbg. 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. */
-
-/* ??? Should calculate branch probabilities before instrumenting code, since
- then we can use arc counts to help decide which arcs to instrument. */
+ Tree-based version. See profile.c for overview. */
#include "config.h"
#include "system.h"
#include "tree-pass.h"
#include "timevar.h"
#include "value-prof.h"
+#include "ggc.h"
+#include "cgraph.h"
+static GTY(()) tree gcov_type_node;
+static GTY(()) tree gcov_type_tmp_var;
+static GTY(()) tree tree_interval_profiler_fn;
+static GTY(()) tree tree_pow2_profiler_fn;
+static GTY(()) tree tree_one_value_profiler_fn;
+static GTY(()) tree tree_indirect_call_profiler_fn;
+static GTY(()) tree tree_average_profiler_fn;
+static GTY(()) tree tree_ior_profiler_fn;
\f
+
+static GTY(()) tree ic_void_ptr_var;
+static GTY(()) tree ic_gcov_type_ptr_var;
+static GTY(()) tree ptr_void;
+
+/* Do initialization work for the edge profiler. */
+
+/* Add code:
+ static gcov* __gcov_indirect_call_counters; // pointer to actual counter
+ static void* __gcov_indirect_call_callee; // actual callee address
+*/
+static void
+tree_init_ic_make_global_vars (void)
+{
+ tree gcov_type_ptr;
+
+ ptr_void = build_pointer_type (void_type_node);
+
+ ic_void_ptr_var
+ = build_decl (VAR_DECL,
+ get_identifier ("__gcov_indirect_call_callee"),
+ ptr_void);
+ TREE_STATIC (ic_void_ptr_var) = 1;
+ TREE_PUBLIC (ic_void_ptr_var) = 0;
+ DECL_ARTIFICIAL (ic_void_ptr_var) = 1;
+ DECL_INITIAL (ic_void_ptr_var) = NULL;
+ DECL_TLS_MODEL (ic_void_ptr_var) = decl_default_tls_model (ic_void_ptr_var);
+ assemble_variable (ic_void_ptr_var, 0, 0, 0);
+
+ gcov_type_ptr = build_pointer_type (get_gcov_type ());
+ ic_gcov_type_ptr_var
+ = build_decl (VAR_DECL,
+ get_identifier ("__gcov_indirect_call_counters"),
+ gcov_type_ptr);
+ TREE_STATIC (ic_gcov_type_ptr_var) = 1;
+ TREE_PUBLIC (ic_gcov_type_ptr_var) = 0;
+ DECL_ARTIFICIAL (ic_gcov_type_ptr_var) = 1;
+ DECL_INITIAL (ic_gcov_type_ptr_var) = NULL;
+ DECL_TLS_MODEL (ic_gcov_type_ptr_var) = decl_default_tls_model (ic_gcov_type_ptr_var);
+ assemble_variable (ic_gcov_type_ptr_var, 0, 0, 0);
+}
+
+static void
+tree_init_edge_profiler (void)
+{
+ tree interval_profiler_fn_type;
+ tree pow2_profiler_fn_type;
+ tree one_value_profiler_fn_type;
+ tree gcov_type_ptr;
+ tree ic_profiler_fn_type;
+ tree average_profiler_fn_type;
+
+ if (!gcov_type_node)
+ {
+ gcov_type_node = get_gcov_type ();
+ gcov_type_ptr = build_pointer_type (gcov_type_node);
+
+ /* void (*) (gcov_type *, gcov_type, int, unsigned) */
+ interval_profiler_fn_type
+ = build_function_type_list (void_type_node,
+ gcov_type_ptr, gcov_type_node,
+ integer_type_node,
+ unsigned_type_node, NULL_TREE);
+ tree_interval_profiler_fn
+ = build_fn_decl ("__gcov_interval_profiler",
+ interval_profiler_fn_type);
+
+ /* void (*) (gcov_type *, gcov_type) */
+ pow2_profiler_fn_type
+ = build_function_type_list (void_type_node,
+ gcov_type_ptr, gcov_type_node,
+ NULL_TREE);
+ tree_pow2_profiler_fn = build_fn_decl ("__gcov_pow2_profiler",
+ pow2_profiler_fn_type);
+
+ /* void (*) (gcov_type *, gcov_type) */
+ one_value_profiler_fn_type
+ = build_function_type_list (void_type_node,
+ gcov_type_ptr, gcov_type_node,
+ NULL_TREE);
+ tree_one_value_profiler_fn
+ = build_fn_decl ("__gcov_one_value_profiler",
+ one_value_profiler_fn_type);
+
+ tree_init_ic_make_global_vars ();
+
+ /* void (*) (gcov_type *, gcov_type, void *, void *) */
+ ic_profiler_fn_type
+ = build_function_type_list (void_type_node,
+ gcov_type_ptr, gcov_type_node,
+ ptr_void,
+ ptr_void, NULL_TREE);
+ tree_indirect_call_profiler_fn
+ = build_fn_decl ("__gcov_indirect_call_profiler",
+ ic_profiler_fn_type);
+ /* void (*) (gcov_type *, gcov_type) */
+ average_profiler_fn_type
+ = build_function_type_list (void_type_node,
+ gcov_type_ptr, gcov_type_node, NULL_TREE);
+ tree_average_profiler_fn
+ = build_fn_decl ("__gcov_average_profiler",
+ average_profiler_fn_type);
+ tree_ior_profiler_fn
+ = build_fn_decl ("__gcov_ior_profiler",
+ average_profiler_fn_type);
+ }
+}
+
+/* New call was added, make goto call edges if neccesary. */
+
+static void
+add_abnormal_goto_call_edges (gimple_stmt_iterator gsi)
+{
+ gimple stmt = gsi_stmt (gsi);
+
+ if (!stmt_can_make_abnormal_goto (stmt))
+ return;
+ if (!gsi_end_p (gsi))
+ split_block (gimple_bb (stmt), stmt);
+ make_abnormal_goto_edges (gimple_bb (stmt), true);
+}
+
/* Output instructions as GIMPLE trees to increment the edge
execution count, and insert them on E. We rely on
- bsi_insert_on_edge to preserve the order. */
+ gsi_insert_on_edge to preserve the order. */
static void
tree_gen_edge_profiler (int edgeno, edge e)
{
- tree tmp1 = create_tmp_var (GCOV_TYPE_NODE, "PROF");
- tree tmp2 = create_tmp_var (GCOV_TYPE_NODE, "PROF");
- tree ref = tree_coverage_counter_ref (GCOV_COUNTER_ARCS, edgeno);
- tree stmt1 = build (MODIFY_EXPR, GCOV_TYPE_NODE, tmp1, ref);
- tree stmt2 = build (MODIFY_EXPR, GCOV_TYPE_NODE, tmp2,
- build (PLUS_EXPR, GCOV_TYPE_NODE,
- tmp1, integer_one_node));
- tree stmt3 = build (MODIFY_EXPR, GCOV_TYPE_NODE, ref, tmp2);
- bsi_insert_on_edge (e, stmt1);
- bsi_insert_on_edge (e, stmt2);
- bsi_insert_on_edge (e, stmt3);
+ tree ref, one;
+ gimple stmt1, stmt2, stmt3;
+
+ /* We share one temporary variable declaration per function. This
+ gets re-set in tree_profiling. */
+ if (gcov_type_tmp_var == NULL_TREE)
+ gcov_type_tmp_var = create_tmp_var (gcov_type_node, "PROF_edge_counter");
+ ref = tree_coverage_counter_ref (GCOV_COUNTER_ARCS, edgeno);
+ one = build_int_cst (gcov_type_node, 1);
+ stmt1 = gimple_build_assign (gcov_type_tmp_var, ref);
+ stmt2 = gimple_build_assign_with_ops (PLUS_EXPR, gcov_type_tmp_var,
+ gcov_type_tmp_var, one);
+ stmt3 = gimple_build_assign (unshare_expr (ref), gcov_type_tmp_var);
+ gsi_insert_on_edge (e, stmt1);
+ gsi_insert_on_edge (e, stmt2);
+ gsi_insert_on_edge (e, stmt3);
+}
+
+/* Emits code to get VALUE to instrument at GSI, and returns the
+ variable containing the value. */
+
+static tree
+prepare_instrumented_value (gimple_stmt_iterator *gsi, histogram_value value)
+{
+ tree val = value->hvalue.value;
+ return force_gimple_operand_gsi (gsi, fold_convert (gcov_type_node, val),
+ true, NULL_TREE, true, GSI_SAME_STMT);
}
/* Output instructions as GIMPLE trees to increment the interval histogram
tag of the section for counters, BASE is offset of the counter position. */
static void
-tree_gen_interval_profiler (struct histogram_value *value ATTRIBUTE_UNUSED,
- unsigned tag ATTRIBUTE_UNUSED,
- unsigned base ATTRIBUTE_UNUSED)
+tree_gen_interval_profiler (histogram_value value, unsigned tag, unsigned base)
{
- /* FIXME implement this. */
- abort ();
+ gimple stmt = value->hvalue.stmt;
+ gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
+ tree ref = tree_coverage_counter_ref (tag, base), ref_ptr;
+ gimple call;
+ tree val;
+ tree start = build_int_cst_type (integer_type_node,
+ value->hdata.intvl.int_start);
+ tree steps = build_int_cst_type (unsigned_type_node,
+ value->hdata.intvl.steps);
+
+ ref_ptr = force_gimple_operand_gsi (&gsi,
+ build_addr (ref, current_function_decl),
+ true, NULL_TREE, true, GSI_SAME_STMT);
+ val = prepare_instrumented_value (&gsi, value);
+ call = gimple_build_call (tree_interval_profiler_fn, 4,
+ ref_ptr, val, start, steps);
+ gsi_insert_before (&gsi, call, GSI_NEW_STMT);
+ add_abnormal_goto_call_edges (gsi);
}
/* Output instructions as GIMPLE trees to increment the power of two histogram
of the section for counters, BASE is offset of the counter position. */
static void
-tree_gen_pow2_profiler (struct histogram_value *value ATTRIBUTE_UNUSED,
- unsigned tag ATTRIBUTE_UNUSED,
- unsigned base ATTRIBUTE_UNUSED)
+tree_gen_pow2_profiler (histogram_value value, unsigned tag, unsigned base)
{
- /* FIXME implement this. */
- abort ();
+ gimple stmt = value->hvalue.stmt;
+ gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
+ tree ref_ptr = tree_coverage_counter_addr (tag, base);
+ gimple call;
+ tree val;
+
+ ref_ptr = force_gimple_operand_gsi (&gsi, ref_ptr,
+ true, NULL_TREE, true, GSI_SAME_STMT);
+ val = prepare_instrumented_value (&gsi, value);
+ call = gimple_build_call (tree_pow2_profiler_fn, 2, ref_ptr, val);
+ gsi_insert_before (&gsi, call, GSI_NEW_STMT);
+ add_abnormal_goto_call_edges (gsi);
}
/* Output instructions as GIMPLE trees for code to find the most common value.
section for counters, BASE is offset of the counter position. */
static void
-tree_gen_one_value_profiler (struct histogram_value *value ATTRIBUTE_UNUSED,
- unsigned tag ATTRIBUTE_UNUSED,
- unsigned base ATTRIBUTE_UNUSED)
+tree_gen_one_value_profiler (histogram_value value, unsigned tag, unsigned base)
{
- /* FIXME implement this. */
- abort ();
+ gimple stmt = value->hvalue.stmt;
+ gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
+ tree ref_ptr = tree_coverage_counter_addr (tag, base);
+ gimple call;
+ tree val;
+
+ ref_ptr = force_gimple_operand_gsi (&gsi, ref_ptr,
+ true, NULL_TREE, true, GSI_SAME_STMT);
+ val = prepare_instrumented_value (&gsi, value);
+ call = gimple_build_call (tree_one_value_profiler_fn, 2, ref_ptr, val);
+ gsi_insert_before (&gsi, call, GSI_NEW_STMT);
+ add_abnormal_goto_call_edges (gsi);
+}
+
+
+/* Output instructions as GIMPLE trees for code to find the most
+ common called function in indirect call.
+ VALUE is the call expression whose indirect callee is profiled.
+ TAG is the tag of the section for counters, BASE is offset of the
+ counter position. */
+
+static void
+tree_gen_ic_profiler (histogram_value value, unsigned tag, unsigned base)
+{
+ tree tmp1;
+ gimple stmt1, stmt2, stmt3;
+ gimple stmt = value->hvalue.stmt;
+ gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
+ tree ref_ptr = tree_coverage_counter_addr (tag, base);
+
+ ref_ptr = force_gimple_operand_gsi (&gsi, ref_ptr,
+ true, NULL_TREE, true, GSI_SAME_STMT);
+
+ /* Insert code:
+
+ __gcov_indirect_call_counters = get_relevant_counter_ptr ();
+ __gcov_indirect_call_callee = (void *) indirect call argument;
+ */
+
+ tmp1 = create_tmp_var (ptr_void, "PROF");
+ stmt1 = gimple_build_assign (ic_gcov_type_ptr_var, ref_ptr);
+ stmt2 = gimple_build_assign (tmp1, unshare_expr (value->hvalue.value));
+ stmt3 = gimple_build_assign (ic_void_ptr_var, tmp1);
+
+ gsi_insert_before (&gsi, stmt1, GSI_SAME_STMT);
+ gsi_insert_before (&gsi, stmt2, GSI_SAME_STMT);
+ gsi_insert_before (&gsi, stmt3, GSI_SAME_STMT);
+}
+
+
+/* Output instructions as GIMPLE trees for code to find the most
+ common called function in indirect call. Insert instructions at the
+ beginning of every possible called function.
+ */
+
+static void
+tree_gen_ic_func_profiler (void)
+{
+ struct cgraph_node * c_node = cgraph_node (current_function_decl);
+ gimple_stmt_iterator gsi;
+ edge e;
+ basic_block bb;
+ edge_iterator ei;
+ gimple stmt1, stmt2;
+ tree tree_uid, cur_func;
+
+ if (!c_node->needed)
+ return;
+
+ tree_init_edge_profiler ();
+
+ FOR_EACH_EDGE (e, ei, ENTRY_BLOCK_PTR->succs)
+ {
+ tree void0;
+
+ bb = split_edge (e);
+ gsi = gsi_start_bb (bb);
+
+ cur_func = force_gimple_operand_gsi (&gsi,
+ build_addr (current_function_decl,
+ current_function_decl),
+ true, NULL_TREE,
+ true, GSI_SAME_STMT);
+ tree_uid = build_int_cst (gcov_type_node, c_node->pid);
+ stmt1 = gimple_build_call (tree_indirect_call_profiler_fn, 4,
+ ic_gcov_type_ptr_var,
+ tree_uid,
+ cur_func,
+ ic_void_ptr_var);
+ gsi_insert_after (&gsi, stmt1, GSI_NEW_STMT);
+ gcc_assert (EDGE_COUNT (bb->succs) == 1);
+ bb = split_edge (EDGE_I (bb->succs, 0));
+ add_abnormal_goto_call_edges (gsi);
+
+ gsi = gsi_start_bb (bb);
+ /* Set __gcov_indirect_call_callee to 0,
+ so that calls from other modules won't get misattributed
+ to the last caller of the current callee. */
+ void0 = build_int_cst (build_pointer_type (void_type_node), 0);
+ stmt2 = gimple_build_assign (ic_void_ptr_var, void0);
+ gsi_insert_after (&gsi, stmt2, GSI_NEW_STMT);
+ }
}
/* Output instructions as GIMPLE trees for code to find the most common value
section for counters, BASE is offset of the counter position. */
static void
-tree_gen_const_delta_profiler (struct histogram_value *value ATTRIBUTE_UNUSED,
- unsigned tag ATTRIBUTE_UNUSED,
- unsigned base ATTRIBUTE_UNUSED)
+tree_gen_const_delta_profiler (histogram_value value ATTRIBUTE_UNUSED,
+ unsigned tag ATTRIBUTE_UNUSED,
+ unsigned base ATTRIBUTE_UNUSED)
{
/* FIXME implement this. */
- abort ();
+#ifdef ENABLE_CHECKING
+ internal_error ("unimplemented functionality");
+#endif
+ gcc_unreachable ();
+}
+
+/* Output instructions as GIMPLE trees to increment the average histogram
+ counter. VALUE is the expression whose value is profiled. TAG is the
+ tag of the section for counters, BASE is offset of the counter position. */
+
+static void
+tree_gen_average_profiler (histogram_value value, unsigned tag, unsigned base)
+{
+ gimple stmt = value->hvalue.stmt;
+ gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
+ tree ref_ptr = tree_coverage_counter_addr (tag, base);
+ gimple call;
+ tree val;
+
+ ref_ptr = force_gimple_operand_gsi (&gsi, ref_ptr,
+ true, NULL_TREE,
+ true, GSI_SAME_STMT);
+ val = prepare_instrumented_value (&gsi, value);
+ call = gimple_build_call (tree_average_profiler_fn, 2, ref_ptr, val);
+ gsi_insert_before (&gsi, call, GSI_NEW_STMT);
+ add_abnormal_goto_call_edges (gsi);
+}
+
+/* Output instructions as GIMPLE trees to increment the ior histogram
+ counter. VALUE is the expression whose value is profiled. TAG is the
+ tag of the section for counters, BASE is offset of the counter position. */
+
+static void
+tree_gen_ior_profiler (histogram_value value, unsigned tag, unsigned base)
+{
+ gimple stmt = value->hvalue.stmt;
+ gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
+ tree ref_ptr = tree_coverage_counter_addr (tag, base);
+ gimple call;
+ tree val;
+
+ ref_ptr = force_gimple_operand_gsi (&gsi, ref_ptr,
+ true, NULL_TREE, true, GSI_SAME_STMT);
+ val = prepare_instrumented_value (&gsi, value);
+ call = gimple_build_call (tree_ior_profiler_fn, 2, ref_ptr, val);
+ gsi_insert_before (&gsi, call, GSI_NEW_STMT);
+ add_abnormal_goto_call_edges (gsi);
}
/* Return 1 if tree-based profiling is in effect, else 0.
If it is, set up hooks for tree-based profiling.
Gate for pass_tree_profile. */
-static bool do_tree_profiling (void)
+static bool
+do_tree_profiling (void)
{
- if (flag_tree_based_profiling)
+ if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
{
tree_register_profile_hooks ();
- tree_register_value_prof_hooks ();
+ gimple_register_value_prof_hooks ();
+ return true;
}
- return flag_tree_based_profiling;
+ return false;
}
-/* Return the file on which profile dump output goes, if any. */
+static unsigned int
+tree_profiling (void)
+{
+ /* Don't profile functions produced at destruction time, particularly
+ the gcov datastructure initializer. Don't profile if it has been
+ already instrumented either (when OpenMP expansion creates
+ child function from already instrumented body). */
+ if (cgraph_state == CGRAPH_STATE_FINISHED
+ || cfun->after_tree_profile)
+ return 0;
-static FILE *tree_profile_dump_file (void) {
- return dump_file;
+ /* Re-set global shared temporary variable for edge-counters. */
+ gcov_type_tmp_var = NULL_TREE;
+
+ branch_prob ();
+
+ if (! flag_branch_probabilities
+ && flag_profile_values)
+ tree_gen_ic_func_profiler ();
+
+ if (flag_branch_probabilities
+ && flag_profile_values
+ && flag_value_profile_transformations)
+ value_profile_transformations ();
+ /* The above could hose dominator info. Currently there is
+ none coming in, this is a safety valve. It should be
+ easy to adjust it, if and when there is some. */
+ free_dominance_info (CDI_DOMINATORS);
+ free_dominance_info (CDI_POST_DOMINATORS);
+ cfun->after_tree_profile = 1;
+ return 0;
}
-struct tree_opt_pass pass_tree_profile =
+struct gimple_opt_pass pass_tree_profile =
{
+ {
+ GIMPLE_PASS,
"tree_profile", /* name */
do_tree_profiling, /* gate */
- branch_prob, /* execute */
+ tree_profiling, /* execute */
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
PROP_gimple_leh | PROP_cfg, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
- TODO_verify_stmts /* todo_flags_finish */
+ TODO_verify_stmts | TODO_dump_func /* todo_flags_finish */
+ }
};
struct profile_hooks tree_profile_hooks =
{
- tree_gen_edge_profiler, /* gen_edge_profiler */
- tree_gen_interval_profiler, /* gen_interval_profiler */
- tree_gen_pow2_profiler, /* gen_pow2_profiler */
- tree_gen_one_value_profiler, /* gen_one_value_profiler */
- tree_gen_const_delta_profiler,/* gen_const_delta_profiler */
- tree_profile_dump_file /* profile_dump_file */
+ tree_init_edge_profiler, /* init_edge_profiler */
+ tree_gen_edge_profiler, /* gen_edge_profiler */
+ tree_gen_interval_profiler, /* gen_interval_profiler */
+ tree_gen_pow2_profiler, /* gen_pow2_profiler */
+ tree_gen_one_value_profiler, /* gen_one_value_profiler */
+ tree_gen_const_delta_profiler, /* gen_const_delta_profiler */
+ tree_gen_ic_profiler, /* gen_ic_profiler */
+ tree_gen_average_profiler, /* gen_average_profiler */
+ tree_gen_ior_profiler /* gen_ior_profiler */
};
+
+#include "gt-tree-profile.h"
OSDN Git Service
