Mercurial > hg > truffle
diff src/share/vm/ci/ciMethodData.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | 48a3fa21394b |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/ci/ciMethodData.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,335 @@ +/* + * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +#include "incls/_precompiled.incl" +#include "incls/_ciMethodData.cpp.incl" + +// ciMethodData + +// ------------------------------------------------------------------ +// ciMethodData::ciMethodData +// +ciMethodData::ciMethodData(methodDataHandle h_md) : ciObject(h_md) { + assert(h_md() != NULL, "no null method data"); + Copy::zero_to_words((HeapWord*) &_orig, sizeof(_orig) / sizeof(HeapWord)); + _data = NULL; + _data_size = 0; + _extra_data_size = 0; + _current_mileage = 0; + _state = empty_state; + _saw_free_extra_data = false; + // Set an initial hint. Don't use set_hint_di() because + // first_di() may be out of bounds if data_size is 0. + _hint_di = first_di(); +} + +// ------------------------------------------------------------------ +// ciMethodData::ciMethodData +// +// No methodDataOop. +ciMethodData::ciMethodData() : ciObject() { + Copy::zero_to_words((HeapWord*) &_orig, sizeof(_orig) / sizeof(HeapWord)); + _data = NULL; + _data_size = 0; + _extra_data_size = 0; + _current_mileage = 0; + _state = empty_state; + _saw_free_extra_data = false; + // Set an initial hint. Don't use set_hint_di() because + // first_di() may be out of bounds if data_size is 0. + _hint_di = first_di(); +} + +void ciMethodData::load_data() { + methodDataOop mdo = get_methodDataOop(); + if (mdo == NULL) return; + + // To do: don't copy the data if it is not "ripe" -- require a minimum # + // of invocations. + + // Snapshot the data -- actually, take an approximate snapshot of + // the data. Any concurrently executing threads may be changing the + // data as we copy it. + int skip_header = oopDesc::header_size(); + Copy::disjoint_words((HeapWord*) mdo + skip_header, + (HeapWord*) &_orig + skip_header, + sizeof(_orig) / HeapWordSize - skip_header); + DEBUG_ONLY(*_orig.adr_method() = NULL); // no dangling oops, please + Arena* arena = CURRENT_ENV->arena(); + _data_size = mdo->data_size(); + _extra_data_size = mdo->extra_data_size(); + int total_size = _data_size + _extra_data_size; + _data = (intptr_t *) arena->Amalloc(total_size); + Copy::disjoint_words((HeapWord*) mdo->data_base(), (HeapWord*) _data, total_size / HeapWordSize); + + // Traverse the profile data, translating any oops into their + // ci equivalents. + ResourceMark rm; + ciProfileData* ci_data = first_data(); + ProfileData* data = mdo->first_data(); + while (is_valid(ci_data)) { + ci_data->translate_from(data); + ci_data = next_data(ci_data); + data = mdo->next_data(data); + } + // Note: Extra data are all BitData, and do not need translation. + _current_mileage = methodDataOopDesc::mileage_of(mdo->method()); + _state = mdo->is_mature()? mature_state: immature_state; + + _eflags = mdo->eflags(); + _arg_local = mdo->arg_local(); + _arg_stack = mdo->arg_stack(); + _arg_returned = mdo->arg_returned(); +} + +void ciReceiverTypeData::translate_receiver_data_from(ProfileData* data) { + for (uint row = 0; row < row_limit(); row++) { + klassOop k = data->as_ReceiverTypeData()->receiver(row); + if (k != NULL) { + ciKlass* klass = CURRENT_ENV->get_object(k)->as_klass(); + set_receiver(row, klass); + } + } +} + + +// Get the data at an arbitrary (sort of) data index. +ciProfileData* ciMethodData::data_at(int data_index) { + if (out_of_bounds(data_index)) { + return NULL; + } + DataLayout* data_layout = data_layout_at(data_index); + + switch (data_layout->tag()) { + case DataLayout::no_tag: + default: + ShouldNotReachHere(); + return NULL; + case DataLayout::bit_data_tag: + return new ciBitData(data_layout); + case DataLayout::counter_data_tag: + return new ciCounterData(data_layout); + case DataLayout::jump_data_tag: + return new ciJumpData(data_layout); + case DataLayout::receiver_type_data_tag: + return new ciReceiverTypeData(data_layout); + case DataLayout::virtual_call_data_tag: + return new ciVirtualCallData(data_layout); + case DataLayout::ret_data_tag: + return new ciRetData(data_layout); + case DataLayout::branch_data_tag: + return new ciBranchData(data_layout); + case DataLayout::multi_branch_data_tag: + return new ciMultiBranchData(data_layout); + }; +} + +// Iteration over data. +ciProfileData* ciMethodData::next_data(ciProfileData* current) { + int current_index = dp_to_di(current->dp()); + int next_index = current_index + current->size_in_bytes(); + ciProfileData* next = data_at(next_index); + return next; +} + +// Translate a bci to its corresponding data, or NULL. +ciProfileData* ciMethodData::bci_to_data(int bci) { + ciProfileData* data = data_before(bci); + for ( ; is_valid(data); data = next_data(data)) { + if (data->bci() == bci) { + set_hint_di(dp_to_di(data->dp())); + return data; + } else if (data->bci() > bci) { + break; + } + } + // bci_to_extra_data(bci) ... + DataLayout* dp = data_layout_at(data_size()); + DataLayout* end = data_layout_at(data_size() + extra_data_size()); + for (; dp < end; dp = methodDataOopDesc::next_extra(dp)) { + if (dp->tag() == DataLayout::no_tag) { + _saw_free_extra_data = true; // observed an empty slot (common case) + return NULL; + } + if (dp->bci() == bci) { + assert(dp->tag() == DataLayout::bit_data_tag, "sane"); + return new ciBitData(dp); + } + } + return NULL; +} + +// Conservatively decode the trap_state of a ciProfileData. +int ciMethodData::has_trap_at(ciProfileData* data, int reason) { + typedef Deoptimization::DeoptReason DR_t; + int per_bc_reason + = Deoptimization::reason_recorded_per_bytecode_if_any((DR_t) reason); + if (trap_count(reason) == 0) { + // Impossible for this trap to have occurred, regardless of trap_state. + // Note: This happens if the MDO is empty. + return 0; + } else if (per_bc_reason == Deoptimization::Reason_none) { + // We cannot conclude anything; a trap happened somewhere, maybe here. + return -1; + } else if (data == NULL) { + // No profile here, not even an extra_data record allocated on the fly. + // If there are empty extra_data records, and there had been a trap, + // there would have been a non-null data pointer. If there are no + // free extra_data records, we must return a conservative -1. + if (_saw_free_extra_data) + return 0; // Q.E.D. + else + return -1; // bail with a conservative answer + } else { + return Deoptimization::trap_state_has_reason(data->trap_state(), per_bc_reason); + } +} + +int ciMethodData::trap_recompiled_at(ciProfileData* data) { + if (data == NULL) { + return (_saw_free_extra_data? 0: -1); // (see previous method) + } else { + return Deoptimization::trap_state_is_recompiled(data->trap_state())? 1: 0; + } +} + +void ciMethodData::clear_escape_info() { + VM_ENTRY_MARK; + methodDataOop mdo = get_methodDataOop(); + if (mdo != NULL) + mdo->clear_escape_info(); + _eflags = _arg_local = _arg_stack = _arg_returned = 0; +} + +// copy our escape info to the methodDataOop if it exists +void ciMethodData::update_escape_info() { + VM_ENTRY_MARK; + methodDataOop mdo = get_methodDataOop(); + if ( mdo != NULL) { + mdo->set_eflags(_eflags); + mdo->set_arg_local(_arg_local); + mdo->set_arg_stack(_arg_stack); + mdo->set_arg_returned(_arg_returned); + } +} + +bool ciMethodData::has_escape_info() { + return eflag_set(methodDataOopDesc::estimated); +} + +void ciMethodData::set_eflag(methodDataOopDesc::EscapeFlag f) { + set_bits(_eflags, f); +} + +void ciMethodData::clear_eflag(methodDataOopDesc::EscapeFlag f) { + clear_bits(_eflags, f); +} + +bool ciMethodData::eflag_set(methodDataOopDesc::EscapeFlag f) const { + return mask_bits(_eflags, f) != 0; +} + +void ciMethodData::set_arg_local(int i) { + set_nth_bit(_arg_local, i); +} + +void ciMethodData::set_arg_stack(int i) { + set_nth_bit(_arg_stack, i); +} + +void ciMethodData::set_arg_returned(int i) { + set_nth_bit(_arg_returned, i); +} + +bool ciMethodData::is_arg_local(int i) const { + return is_set_nth_bit(_arg_local, i); +} + +bool ciMethodData::is_arg_stack(int i) const { + return is_set_nth_bit(_arg_stack, i); +} + +bool ciMethodData::is_arg_returned(int i) const { + return is_set_nth_bit(_arg_returned, i); +} + +ByteSize ciMethodData::offset_of_slot(ciProfileData* data, ByteSize slot_offset_in_data) { + // Get offset within methodDataOop of the data array + ByteSize data_offset = methodDataOopDesc::data_offset(); + + // Get cell offset of the ProfileData within data array + int cell_offset = dp_to_di(data->dp()); + + // Add in counter_offset, the # of bytes into the ProfileData of counter or flag + int offset = in_bytes(data_offset) + cell_offset + in_bytes(slot_offset_in_data); + + return in_ByteSize(offset); +} + +// Implementation of the print method. +void ciMethodData::print_impl(outputStream* st) { + ciObject::print_impl(st); +} + +#ifndef PRODUCT +void ciMethodData::print() { + print_data_on(tty); +} + +void ciMethodData::print_data_on(outputStream* st) { + ResourceMark rm; + ciProfileData* data; + for (data = first_data(); is_valid(data); data = next_data(data)) { + st->print("%d", dp_to_di(data->dp())); + st->fill_to(6); + data->print_data_on(st); + } +} + +void ciReceiverTypeData::print_receiver_data_on(outputStream* st) { + uint row; + int entries = 0; + for (row = 0; row < row_limit(); row++) { + if (receiver(row) != NULL) entries++; + } + st->print_cr("count(%u) entries(%u)", count(), entries); + for (row = 0; row < row_limit(); row++) { + if (receiver(row) != NULL) { + tab(st); + receiver(row)->print_name_on(st); + st->print_cr("(%u)", receiver_count(row)); + } + } +} + +void ciReceiverTypeData::print_data_on(outputStream* st) { + print_shared(st, "ciReceiverTypeData"); + print_receiver_data_on(st); +} + +void ciVirtualCallData::print_data_on(outputStream* st) { + print_shared(st, "ciVirtualCallData"); + rtd_super()->print_receiver_data_on(st); +} +#endif