Liam Appelbe
155ac440f7
Change-Id: I8264b340ee91d883afc52a52e83cda504f552e37 TEST=CI Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/191302 Commit-Queue: Liam Appelbe <liama@google.com> Reviewed-by: Alexander Markov <alexmarkov@google.com> Reviewed-by: Ryan Macnak <rmacnak@google.com>
109 lines
3.9 KiB
C++
109 lines
3.9 KiB
C++
// Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/reverse_pc_lookup_cache.h"
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#include "vm/isolate.h"
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#include "vm/object.h"
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#include "vm/object_store.h"
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#include "vm/stub_code.h"
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namespace dart {
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ObjectPtr ReversePc::FindCodeDescriptorInGroup(IsolateGroup* group,
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uword pc,
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bool is_return_address,
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uword* code_start) {
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#if defined(DART_PRECOMPILED_RUNTIME)
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// This can run in the middle of GC and must not allocate handles.
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NoSafepointScope no_safepoint;
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if (is_return_address) {
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pc--;
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}
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// This expected number of tables is low (one per loading unit), so we go
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// through them linearly. If this changes, would could sort the table list
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// during deserialization and binary search for the table.
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GrowableObjectArrayPtr tables = group->object_store()->instructions_tables();
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intptr_t tables_length = Smi::Value(tables->untag()->length());
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for (intptr_t i = 0; i < tables_length; i++) {
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InstructionsTablePtr table = static_cast<InstructionsTablePtr>(
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tables->untag()->data()->untag()->element(i));
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intptr_t index = InstructionsTable::FindEntry(table, pc);
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if (index >= 0) {
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*code_start = InstructionsTable::PayloadStartAt(table, index);
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return InstructionsTable::DescriptorAt(table, index);
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}
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}
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#endif // defined(DART_PRECOMPILED_RUNTIME)
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*code_start = 0;
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return Object::null();
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}
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ObjectPtr ReversePc::FindCodeDescriptor(IsolateGroup* group,
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uword pc,
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bool is_return_address,
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uword* code_start) {
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ASSERT(FLAG_precompiled_mode && FLAG_use_bare_instructions);
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NoSafepointScope no_safepoint;
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ObjectPtr code_descriptor =
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FindCodeDescriptorInGroup(group, pc, is_return_address, code_start);
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if (code_descriptor == Object::null()) {
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code_descriptor = FindCodeDescriptorInGroup(Dart::vm_isolate_group(), pc,
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is_return_address, code_start);
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}
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return code_descriptor;
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}
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CodePtr ReversePc::Lookup(IsolateGroup* group,
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uword pc,
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bool is_return_address) {
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ASSERT(FLAG_precompiled_mode && FLAG_use_bare_instructions);
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NoSafepointScope no_safepoint;
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uword code_start;
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ObjectPtr code_descriptor =
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FindCodeDescriptor(group, pc, is_return_address, &code_start);
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if (code_descriptor != Object::null()) {
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if (!code_descriptor->IsCode()) {
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ASSERT(StubCode::UnknownDartCode().PayloadStart() == 0);
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ASSERT(StubCode::UnknownDartCode().Size() == kUwordMax);
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ASSERT(StubCode::UnknownDartCode().IsFunctionCode());
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ASSERT(StubCode::UnknownDartCode().IsUnknownDartCode());
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code_descriptor = StubCode::UnknownDartCode().ptr();
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}
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}
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return static_cast<CodePtr>(code_descriptor);
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}
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CompressedStackMapsPtr ReversePc::FindCompressedStackMaps(
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IsolateGroup* group,
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uword pc,
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bool is_return_address,
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uword* code_start) {
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ASSERT(FLAG_precompiled_mode && FLAG_use_bare_instructions);
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NoSafepointScope no_safepoint;
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ObjectPtr code_descriptor =
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FindCodeDescriptor(group, pc, is_return_address, code_start);
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if (code_descriptor != Object::null()) {
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if (code_descriptor->IsCode()) {
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CodePtr code = static_cast<CodePtr>(code_descriptor);
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ASSERT(*code_start == Code::PayloadStartOf(code));
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return code->untag()->compressed_stackmaps();
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} else {
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ASSERT(code_descriptor->IsCompressedStackMaps());
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return static_cast<CompressedStackMapsPtr>(code_descriptor);
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}
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}
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*code_start = 0;
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return CompressedStackMaps::null();
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}
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} // namespace dart
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