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85 lines
3.0 KiB
C++
85 lines
3.0 KiB
C++
/*
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* Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "asm/codeBuffer.inline.hpp"
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#include "asm/macroAssembler.hpp"
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void CodeBuffer::share_trampoline_for(address dest, int caller_offset) {
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if (_shared_trampoline_requests == nullptr) {
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constexpr unsigned init_size = 8;
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constexpr unsigned max_size = 256;
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_shared_trampoline_requests = new (mtCompiler)SharedTrampolineRequests(init_size, max_size);
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}
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bool created;
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Offsets* offsets = _shared_trampoline_requests->put_if_absent(dest, &created);
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if (created) {
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_shared_trampoline_requests->maybe_grow();
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}
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offsets->add(caller_offset);
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_finalize_stubs = true;
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}
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#define __ masm.
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static bool emit_shared_trampolines(CodeBuffer* cb, CodeBuffer::SharedTrampolineRequests* requests) {
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if (requests == nullptr) {
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return true;
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}
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MacroAssembler masm(cb);
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auto emit = [&](address dest, const CodeBuffer::Offsets &offsets) {
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assert(cb->stubs()->remaining() >= MacroAssembler::max_trampoline_stub_size(), "pre-allocated trampolines");
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LinkedListIterator<int> it(offsets.head());
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int offset = *it.next();
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address stub = __ emit_trampoline_stub(offset, dest);
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assert(stub, "pre-allocated trampolines");
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address reloc_pc = cb->stubs()->end() - NativeCallTrampolineStub::instruction_size;
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while (!it.is_empty()) {
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offset = *it.next();
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address caller_pc = cb->insts()->start() + offset;
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cb->stubs()->relocate(reloc_pc, trampoline_stub_Relocation::spec(caller_pc));
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}
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return true;
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};
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assert(requests->number_of_entries() >= 1, "at least one");
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const int total_requested_size = MacroAssembler::max_trampoline_stub_size() * requests->number_of_entries();
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if (cb->stubs()->maybe_expand_to_ensure_remaining(total_requested_size) && cb->blob() == nullptr) {
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return false;
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}
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requests->iterate(emit);
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return true;
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}
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#undef __
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bool CodeBuffer::pd_finalize_stubs() {
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return emit_shared_stubs_to_interp<MacroAssembler>(this, _shared_stub_to_interp_requests)
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&& emit_shared_trampolines(this, _shared_trampoline_requests);
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}
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