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7092905: C2: Keep track of the number of dead nodes
Keep an (almost) accurate running count of the reachable (live) flow graph nodes. Reviewed-by: kvn, twisti, jrose, vlivanov
This commit is contained in:
Bharadwaj Yadavalli
parent
96562be9e5
commit
2d2532e740
28 changed files with 306 additions and 120 deletions
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@ -316,7 +316,12 @@ void Compile::gvn_replace_by(Node* n, Node* nn) {
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}
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static inline bool not_a_node(const Node* n) {
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if (n == NULL) return true;
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if (((intptr_t)n & 1) != 0) return true; // uninitialized, etc.
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if (*(address*)n == badAddress) return true; // kill by Node::destruct
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return false;
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}
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// Identify all nodes that are reachable from below, useful.
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// Use breadth-first pass that records state in a Unique_Node_List,
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@ -337,12 +342,27 @@ void Compile::identify_useful_nodes(Unique_Node_List &useful) {
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uint max = n->len();
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for( uint i = 0; i < max; ++i ) {
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Node *m = n->in(i);
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if( m == NULL ) continue;
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if (not_a_node(m)) continue;
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useful.push(m);
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}
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}
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}
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// Update dead_node_list with any missing dead nodes using useful
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// list. Consider all non-useful nodes to be useless i.e., dead nodes.
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void Compile::update_dead_node_list(Unique_Node_List &useful) {
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uint max_idx = unique();
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VectorSet& useful_node_set = useful.member_set();
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for (uint node_idx = 0; node_idx < max_idx; node_idx++) {
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// If node with index node_idx is not in useful set,
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// mark it as dead in dead node list.
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if (! useful_node_set.test(node_idx) ) {
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record_dead_node(node_idx);
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}
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}
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}
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// Disconnect all useless nodes by disconnecting those at the boundary.
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void Compile::remove_useless_nodes(Unique_Node_List &useful) {
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uint next = 0;
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@ -582,6 +602,8 @@ Compile::Compile( ciEnv* ci_env, C2Compiler* compiler, ciMethod* target, int osr
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_inner_loops(0),
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_scratch_const_size(-1),
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_in_scratch_emit_size(false),
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_dead_node_list(comp_arena()),
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_dead_node_count(0),
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#ifndef PRODUCT
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_trace_opto_output(TraceOptoOutput || method()->has_option("TraceOptoOutput")),
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_printer(IdealGraphPrinter::printer()),
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@ -873,6 +895,8 @@ Compile::Compile( ciEnv* ci_env,
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_trace_opto_output(TraceOptoOutput),
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_printer(NULL),
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#endif
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_dead_node_list(comp_arena()),
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_dead_node_count(0),
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_congraph(NULL) {
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C = this;
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@ -1069,6 +1093,72 @@ void Compile::set_cached_top_node(Node* tn) {
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assert(_top == NULL || top()->is_top(), "");
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}
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#ifdef ASSERT
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uint Compile::count_live_nodes_by_graph_walk() {
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Unique_Node_List useful(comp_arena());
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// Get useful node list by walking the graph.
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identify_useful_nodes(useful);
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return useful.size();
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}
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void Compile::print_missing_nodes() {
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// Return if CompileLog is NULL and PrintIdealNodeCount is false.
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if ((_log == NULL) && (! PrintIdealNodeCount)) {
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return;
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}
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// This is an expensive function. It is executed only when the user
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// specifies VerifyIdealNodeCount option or otherwise knows the
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// additional work that needs to be done to identify reachable nodes
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// by walking the flow graph and find the missing ones using
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// _dead_node_list.
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Unique_Node_List useful(comp_arena());
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// Get useful node list by walking the graph.
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identify_useful_nodes(useful);
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uint l_nodes = C->live_nodes();
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uint l_nodes_by_walk = useful.size();
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if (l_nodes != l_nodes_by_walk) {
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if (_log != NULL) {
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_log->begin_head("mismatched_nodes count='%d'", abs((int) (l_nodes - l_nodes_by_walk)));
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_log->stamp();
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_log->end_head();
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}
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VectorSet& useful_member_set = useful.member_set();
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int last_idx = l_nodes_by_walk;
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for (int i = 0; i < last_idx; i++) {
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if (useful_member_set.test(i)) {
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if (_dead_node_list.test(i)) {
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if (_log != NULL) {
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_log->elem("mismatched_node_info node_idx='%d' type='both live and dead'", i);
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}
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if (PrintIdealNodeCount) {
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// Print the log message to tty
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tty->print_cr("mismatched_node idx='%d' both live and dead'", i);
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useful.at(i)->dump();
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}
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}
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}
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else if (! _dead_node_list.test(i)) {
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if (_log != NULL) {
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_log->elem("mismatched_node_info node_idx='%d' type='neither live nor dead'", i);
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}
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if (PrintIdealNodeCount) {
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// Print the log message to tty
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tty->print_cr("mismatched_node idx='%d' type='neither live nor dead'", i);
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}
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}
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}
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if (_log != NULL) {
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_log->tail("mismatched_nodes");
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}
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}
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}
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#endif
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#ifndef PRODUCT
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void Compile::verify_top(Node* tn) const {
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if (tn != NULL) {
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@ -2087,7 +2177,7 @@ static bool oop_offset_is_sane(const TypeInstPtr* tp) {
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// Eliminate trivially redundant StoreCMs and accumulate their
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// precedence edges.
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static void eliminate_redundant_card_marks(Node* n) {
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void Compile::eliminate_redundant_card_marks(Node* n) {
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assert(n->Opcode() == Op_StoreCM, "expected StoreCM");
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if (n->in(MemNode::Address)->outcnt() > 1) {
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// There are multiple users of the same address so it might be
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@ -2122,7 +2212,7 @@ static void eliminate_redundant_card_marks(Node* n) {
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// Eliminate the previous StoreCM
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prev->set_req(MemNode::Memory, mem->in(MemNode::Memory));
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assert(mem->outcnt() == 0, "should be dead");
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mem->disconnect_inputs(NULL);
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mem->disconnect_inputs(NULL, this);
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} else {
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prev = mem;
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}
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@ -2133,7 +2223,7 @@ static void eliminate_redundant_card_marks(Node* n) {
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//------------------------------final_graph_reshaping_impl----------------------
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// Implement items 1-5 from final_graph_reshaping below.
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static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc ) {
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void Compile::final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc) {
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if ( n->outcnt() == 0 ) return; // dead node
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uint nop = n->Opcode();
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@ -2163,8 +2253,7 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc ) {
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#ifdef ASSERT
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if( n->is_Mem() ) {
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Compile* C = Compile::current();
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int alias_idx = C->get_alias_index(n->as_Mem()->adr_type());
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int alias_idx = get_alias_index(n->as_Mem()->adr_type());
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assert( n->in(0) != NULL || alias_idx != Compile::AliasIdxRaw ||
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// oop will be recorded in oop map if load crosses safepoint
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n->is_Load() && (n->as_Load()->bottom_type()->isa_oopptr() ||
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@ -2213,7 +2302,7 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc ) {
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break;
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case Op_Opaque1: // Remove Opaque Nodes before matching
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case Op_Opaque2: // Remove Opaque Nodes before matching
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n->subsume_by(n->in(1));
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n->subsume_by(n->in(1), this);
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break;
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case Op_CallStaticJava:
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case Op_CallJava:
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@ -2337,8 +2426,7 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc ) {
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int op = t->isa_oopptr() ? Op_ConN : Op_ConNKlass;
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// Look for existing ConN node of the same exact type.
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Compile* C = Compile::current();
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Node* r = C->root();
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Node* r = root();
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uint cnt = r->outcnt();
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for (uint i = 0; i < cnt; i++) {
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Node* m = r->raw_out(i);
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@ -2352,14 +2440,14 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc ) {
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// Decode a narrow oop to match address
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// [R12 + narrow_oop_reg<<3 + offset]
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if (t->isa_oopptr()) {
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nn = new (C) DecodeNNode(nn, t);
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nn = new (this) DecodeNNode(nn, t);
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} else {
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nn = new (C) DecodeNKlassNode(nn, t);
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nn = new (this) DecodeNKlassNode(nn, t);
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}
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n->set_req(AddPNode::Base, nn);
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n->set_req(AddPNode::Address, nn);
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if (addp->outcnt() == 0) {
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addp->disconnect_inputs(NULL);
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addp->disconnect_inputs(NULL, this);
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}
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}
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}
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@ -2371,7 +2459,6 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc ) {
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#ifdef _LP64
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case Op_CastPP:
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if (n->in(1)->is_DecodeN() && Matcher::gen_narrow_oop_implicit_null_checks()) {
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Compile* C = Compile::current();
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Node* in1 = n->in(1);
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const Type* t = n->bottom_type();
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Node* new_in1 = in1->clone();
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@ -2400,9 +2487,9 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc ) {
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new_in1->set_req(0, n->in(0));
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}
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n->subsume_by(new_in1);
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n->subsume_by(new_in1, this);
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if (in1->outcnt() == 0) {
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in1->disconnect_inputs(NULL);
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in1->disconnect_inputs(NULL, this);
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}
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}
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break;
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@ -2419,7 +2506,6 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc ) {
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}
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assert(in1->is_DecodeNarrowPtr(), "sanity");
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Compile* C = Compile::current();
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Node* new_in2 = NULL;
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if (in2->is_DecodeNarrowPtr()) {
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assert(in2->Opcode() == in1->Opcode(), "must be same node type");
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@ -2432,7 +2518,7 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc ) {
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// oops implicit null check is not generated.
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// This will allow to generate normal oop implicit null check.
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if (Matcher::gen_narrow_oop_implicit_null_checks())
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new_in2 = ConNode::make(C, TypeNarrowOop::NULL_PTR);
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new_in2 = ConNode::make(this, TypeNarrowOop::NULL_PTR);
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//
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// This transformation together with CastPP transformation above
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// will generated code for implicit NULL checks for compressed oops.
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@ -2471,19 +2557,19 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc ) {
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// NullCheck base_reg
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//
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} else if (t->isa_oopptr()) {
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new_in2 = ConNode::make(C, t->make_narrowoop());
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new_in2 = ConNode::make(this, t->make_narrowoop());
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} else if (t->isa_klassptr()) {
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new_in2 = ConNode::make(C, t->make_narrowklass());
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new_in2 = ConNode::make(this, t->make_narrowklass());
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}
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}
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if (new_in2 != NULL) {
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Node* cmpN = new (C) CmpNNode(in1->in(1), new_in2);
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n->subsume_by( cmpN );
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Node* cmpN = new (this) CmpNNode(in1->in(1), new_in2);
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n->subsume_by(cmpN, this);
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if (in1->outcnt() == 0) {
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in1->disconnect_inputs(NULL);
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in1->disconnect_inputs(NULL, this);
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}
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if (in2->outcnt() == 0) {
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in2->disconnect_inputs(NULL);
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in2->disconnect_inputs(NULL, this);
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}
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}
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}
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@ -2501,21 +2587,20 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc ) {
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case Op_EncodePKlass: {
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Node* in1 = n->in(1);
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if (in1->is_DecodeNarrowPtr()) {
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n->subsume_by(in1->in(1));
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n->subsume_by(in1->in(1), this);
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} else if (in1->Opcode() == Op_ConP) {
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Compile* C = Compile::current();
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const Type* t = in1->bottom_type();
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if (t == TypePtr::NULL_PTR) {
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assert(t->isa_oopptr(), "null klass?");
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n->subsume_by(ConNode::make(C, TypeNarrowOop::NULL_PTR));
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n->subsume_by(ConNode::make(this, TypeNarrowOop::NULL_PTR), this);
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} else if (t->isa_oopptr()) {
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n->subsume_by(ConNode::make(C, t->make_narrowoop()));
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n->subsume_by(ConNode::make(this, t->make_narrowoop()), this);
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} else if (t->isa_klassptr()) {
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n->subsume_by(ConNode::make(C, t->make_narrowklass()));
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n->subsume_by(ConNode::make(this, t->make_narrowklass()), this);
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}
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}
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if (in1->outcnt() == 0) {
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in1->disconnect_inputs(NULL);
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in1->disconnect_inputs(NULL, this);
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}
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break;
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}
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@ -2538,7 +2623,7 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc ) {
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}
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}
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assert(proj != NULL, "must be found");
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p->subsume_by(proj);
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p->subsume_by(proj, this);
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}
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}
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break;
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@ -2558,7 +2643,7 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc ) {
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unique_in = NULL;
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}
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if (unique_in != NULL) {
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n->subsume_by(unique_in);
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n->subsume_by(unique_in, this);
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}
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}
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break;
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@ -2571,16 +2656,15 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc ) {
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Node* d = n->find_similar(Op_DivI);
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if (d) {
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// Replace them with a fused divmod if supported
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Compile* C = Compile::current();
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if (Matcher::has_match_rule(Op_DivModI)) {
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DivModINode* divmod = DivModINode::make(C, n);
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d->subsume_by(divmod->div_proj());
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n->subsume_by(divmod->mod_proj());
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DivModINode* divmod = DivModINode::make(this, n);
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d->subsume_by(divmod->div_proj(), this);
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n->subsume_by(divmod->mod_proj(), this);
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} else {
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// replace a%b with a-((a/b)*b)
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Node* mult = new (C) MulINode(d, d->in(2));
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Node* sub = new (C) SubINode(d->in(1), mult);
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n->subsume_by( sub );
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Node* mult = new (this) MulINode(d, d->in(2));
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Node* sub = new (this) SubINode(d->in(1), mult);
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n->subsume_by(sub, this);
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}
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}
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}
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@ -2592,16 +2676,15 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc ) {
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Node* d = n->find_similar(Op_DivL);
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if (d) {
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// Replace them with a fused divmod if supported
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Compile* C = Compile::current();
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if (Matcher::has_match_rule(Op_DivModL)) {
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DivModLNode* divmod = DivModLNode::make(C, n);
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d->subsume_by(divmod->div_proj());
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n->subsume_by(divmod->mod_proj());
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DivModLNode* divmod = DivModLNode::make(this, n);
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d->subsume_by(divmod->div_proj(), this);
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n->subsume_by(divmod->mod_proj(), this);
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} else {
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// replace a%b with a-((a/b)*b)
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Node* mult = new (C) MulLNode(d, d->in(2));
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Node* sub = new (C) SubLNode(d->in(1), mult);
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n->subsume_by( sub );
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Node* mult = new (this) MulLNode(d, d->in(2));
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Node* sub = new (this) SubLNode(d->in(1), mult);
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n->subsume_by(sub, this);
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}
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}
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}
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@ -2620,8 +2703,8 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc ) {
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if (n->req()-1 > 2) {
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// Replace many operand PackNodes with a binary tree for matching
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PackNode* p = (PackNode*) n;
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Node* btp = p->binary_tree_pack(Compile::current(), 1, n->req());
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n->subsume_by(btp);
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Node* btp = p->binary_tree_pack(this, 1, n->req());
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n->subsume_by(btp, this);
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}
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break;
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case Op_Loop:
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@ -2645,18 +2728,16 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc ) {
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if (t != NULL && t->is_con()) {
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juint shift = t->get_con();
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if (shift > mask) { // Unsigned cmp
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Compile* C = Compile::current();
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n->set_req(2, ConNode::make(C, TypeInt::make(shift & mask)));
|
||||
n->set_req(2, ConNode::make(this, TypeInt::make(shift & mask)));
|
||||
}
|
||||
} else {
|
||||
if (t == NULL || t->_lo < 0 || t->_hi > (int)mask) {
|
||||
Compile* C = Compile::current();
|
||||
Node* shift = new (C) AndINode(in2, ConNode::make(C, TypeInt::make(mask)));
|
||||
Node* shift = new (this) AndINode(in2, ConNode::make(this, TypeInt::make(mask)));
|
||||
n->set_req(2, shift);
|
||||
}
|
||||
}
|
||||
if (in2->outcnt() == 0) { // Remove dead node
|
||||
in2->disconnect_inputs(NULL);
|
||||
in2->disconnect_inputs(NULL, this);
|
||||
}
|
||||
}
|
||||
break;
|
||||
|
|
@ -2674,7 +2755,7 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc ) {
|
|||
//------------------------------final_graph_reshaping_walk---------------------
|
||||
// Replacing Opaque nodes with their input in final_graph_reshaping_impl(),
|
||||
// requires that the walk visits a node's inputs before visiting the node.
|
||||
static void final_graph_reshaping_walk( Node_Stack &nstack, Node *root, Final_Reshape_Counts &frc ) {
|
||||
void Compile::final_graph_reshaping_walk( Node_Stack &nstack, Node *root, Final_Reshape_Counts &frc ) {
|
||||
ResourceArea *area = Thread::current()->resource_area();
|
||||
Unique_Node_List sfpt(area);
|
||||
|
||||
|
|
@ -2741,7 +2822,7 @@ static void final_graph_reshaping_walk( Node_Stack &nstack, Node *root, Final_Re
|
|||
n->set_req(j, in->in(1));
|
||||
}
|
||||
if (in->outcnt() == 0) {
|
||||
in->disconnect_inputs(NULL);
|
||||
in->disconnect_inputs(NULL, this);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -3014,7 +3095,8 @@ void Compile::record_failure(const char* reason) {
|
|||
}
|
||||
|
||||
Compile::TracePhase::TracePhase(const char* name, elapsedTimer* accumulator, bool dolog)
|
||||
: TraceTime(NULL, accumulator, false NOT_PRODUCT( || TimeCompiler ), false)
|
||||
: TraceTime(NULL, accumulator, false NOT_PRODUCT( || TimeCompiler ), false),
|
||||
_phase_name(name), _dolog(dolog)
|
||||
{
|
||||
if (dolog) {
|
||||
C = Compile::current();
|
||||
|
|
@ -3024,15 +3106,34 @@ Compile::TracePhase::TracePhase(const char* name, elapsedTimer* accumulator, boo
|
|||
_log = NULL;
|
||||
}
|
||||
if (_log != NULL) {
|
||||
_log->begin_head("phase name='%s' nodes='%d'", name, C->unique());
|
||||
_log->begin_head("phase name='%s' nodes='%d' live='%d'", _phase_name, C->unique(), C->live_nodes());
|
||||
_log->stamp();
|
||||
_log->end_head();
|
||||
}
|
||||
}
|
||||
|
||||
Compile::TracePhase::~TracePhase() {
|
||||
|
||||
C = Compile::current();
|
||||
if (_dolog) {
|
||||
_log = C->log();
|
||||
} else {
|
||||
_log = NULL;
|
||||
}
|
||||
|
||||
#ifdef ASSERT
|
||||
if (PrintIdealNodeCount) {
|
||||
tty->print_cr("phase name='%s' nodes='%d' live='%d' live_graph_walk='%d'",
|
||||
_phase_name, C->unique(), C->live_nodes(), C->count_live_nodes_by_graph_walk());
|
||||
}
|
||||
|
||||
if (VerifyIdealNodeCount) {
|
||||
Compile::current()->print_missing_nodes();
|
||||
}
|
||||
#endif
|
||||
|
||||
if (_log != NULL) {
|
||||
_log->done("phase nodes='%d'", C->unique());
|
||||
_log->done("phase name='%s' nodes='%d' live='%d'", _phase_name, C->unique(), C->live_nodes());
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue