372 lines
14 KiB
C++
372 lines
14 KiB
C++
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "art_method.h"
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#include "arch/context.h"
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#include "art_field-inl.h"
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#include "art_method-inl.h"
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#include "base/stringpiece.h"
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#include "class-inl.h"
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#include "dex_file-inl.h"
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#include "dex_instruction.h"
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#include "gc/accounting/card_table-inl.h"
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#include "interpreter/interpreter.h"
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#include "jni_internal.h"
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#include "mapping_table.h"
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#include "method_helper-inl.h"
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#include "object_array-inl.h"
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#include "object_array.h"
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#include "object-inl.h"
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#include "scoped_thread_state_change.h"
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#include "string.h"
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#include "well_known_classes.h"
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namespace art {
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namespace mirror {
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extern "C" void art_portable_invoke_stub(ArtMethod*, uint32_t*, uint32_t, Thread*, JValue*, char);
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extern "C" void art_quick_invoke_stub(ArtMethod*, uint32_t*, uint32_t, Thread*, JValue*,
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const char*);
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#ifdef __LP64__
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extern "C" void art_quick_invoke_static_stub(ArtMethod*, uint32_t*, uint32_t, Thread*, JValue*,
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const char*);
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#endif
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// TODO: get global references for these
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GcRoot<Class> ArtMethod::java_lang_reflect_ArtMethod_;
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ArtMethod* ArtMethod::FromReflectedMethod(const ScopedObjectAccessAlreadyRunnable& soa,
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jobject jlr_method) {
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mirror::ArtField* f =
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soa.DecodeField(WellKnownClasses::java_lang_reflect_AbstractMethod_artMethod);
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mirror::ArtMethod* method = f->GetObject(soa.Decode<mirror::Object*>(jlr_method))->AsArtMethod();
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DCHECK(method != nullptr);
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return method;
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}
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void ArtMethod::VisitRoots(RootCallback* callback, void* arg) {
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java_lang_reflect_ArtMethod_.VisitRootIfNonNull(callback, arg, RootInfo(kRootStickyClass));
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}
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InvokeType ArtMethod::GetInvokeType() {
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// TODO: kSuper?
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if (GetDeclaringClass()->IsInterface()) {
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return kInterface;
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} else if (IsStatic()) {
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return kStatic;
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} else if (IsDirect()) {
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return kDirect;
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} else {
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return kVirtual;
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}
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}
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void ArtMethod::SetClass(Class* java_lang_reflect_ArtMethod) {
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CHECK(java_lang_reflect_ArtMethod_.IsNull());
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CHECK(java_lang_reflect_ArtMethod != NULL);
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java_lang_reflect_ArtMethod_ = GcRoot<Class>(java_lang_reflect_ArtMethod);
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}
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void ArtMethod::ResetClass() {
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CHECK(!java_lang_reflect_ArtMethod_.IsNull());
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java_lang_reflect_ArtMethod_ = GcRoot<Class>(nullptr);
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}
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size_t ArtMethod::NumArgRegisters(const StringPiece& shorty) {
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CHECK_LE(1, shorty.length());
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uint32_t num_registers = 0;
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for (int i = 1; i < shorty.length(); ++i) {
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char ch = shorty[i];
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if (ch == 'D' || ch == 'J') {
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num_registers += 2;
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} else {
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num_registers += 1;
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}
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}
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return num_registers;
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}
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ArtMethod* ArtMethod::FindOverriddenMethod() {
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if (IsStatic()) {
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return NULL;
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}
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Class* declaring_class = GetDeclaringClass();
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Class* super_class = declaring_class->GetSuperClass();
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uint16_t method_index = GetMethodIndex();
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ArtMethod* result = NULL;
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// Did this method override a super class method? If so load the result from the super class'
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// vtable
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if (super_class->HasVTable() && method_index < super_class->GetVTableLength()) {
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result = super_class->GetVTableEntry(method_index);
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} else {
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// Method didn't override superclass method so search interfaces
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if (IsProxyMethod()) {
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result = GetDexCacheResolvedMethods()->Get(GetDexMethodIndex());
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CHECK_EQ(result,
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Runtime::Current()->GetClassLinker()->FindMethodForProxy(GetDeclaringClass(), this));
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} else {
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StackHandleScope<2> hs(Thread::Current());
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MethodHelper mh(hs.NewHandle(this));
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MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr));
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IfTable* iftable = GetDeclaringClass()->GetIfTable();
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for (size_t i = 0; i < iftable->Count() && result == NULL; i++) {
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Class* interface = iftable->GetInterface(i);
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for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) {
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interface_mh.ChangeMethod(interface->GetVirtualMethod(j));
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if (mh.HasSameNameAndSignature(&interface_mh)) {
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result = interface_mh.GetMethod();
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break;
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}
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}
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}
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}
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}
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if (kIsDebugBuild) {
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StackHandleScope<2> hs(Thread::Current());
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MethodHelper result_mh(hs.NewHandle(result));
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MethodHelper this_mh(hs.NewHandle(this));
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DCHECK(result == nullptr || this_mh.HasSameNameAndSignature(&result_mh));
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}
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return result;
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}
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uint32_t ArtMethod::ToDexPc(const uintptr_t pc, bool abort_on_failure) {
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if (IsPortableCompiled()) {
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// Portable doesn't use the machine pc, we just use dex pc instead.
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return static_cast<uint32_t>(pc);
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}
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const void* entry_point = GetQuickOatEntryPoint(sizeof(void*));
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MappingTable table(entry_point != nullptr ?
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GetMappingTable(EntryPointToCodePointer(entry_point), sizeof(void*)) : nullptr);
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if (table.TotalSize() == 0) {
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// NOTE: Special methods (see Mir2Lir::GenSpecialCase()) have an empty mapping
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// but they have no suspend checks and, consequently, we never call ToDexPc() for them.
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DCHECK(IsNative() || IsCalleeSaveMethod() || IsProxyMethod()) << PrettyMethod(this);
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return DexFile::kDexNoIndex; // Special no mapping case
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}
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uint32_t sought_offset = pc - reinterpret_cast<uintptr_t>(entry_point);
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// Assume the caller wants a pc-to-dex mapping so check here first.
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typedef MappingTable::PcToDexIterator It;
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for (It cur = table.PcToDexBegin(), end = table.PcToDexEnd(); cur != end; ++cur) {
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if (cur.NativePcOffset() == sought_offset) {
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return cur.DexPc();
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}
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}
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// Now check dex-to-pc mappings.
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typedef MappingTable::DexToPcIterator It2;
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for (It2 cur = table.DexToPcBegin(), end = table.DexToPcEnd(); cur != end; ++cur) {
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if (cur.NativePcOffset() == sought_offset) {
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return cur.DexPc();
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}
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}
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if (abort_on_failure) {
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LOG(FATAL) << "Failed to find Dex offset for PC offset " << reinterpret_cast<void*>(sought_offset)
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<< "(PC " << reinterpret_cast<void*>(pc) << ", entry_point=" << entry_point
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<< ") in " << PrettyMethod(this);
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}
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return DexFile::kDexNoIndex;
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}
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uintptr_t ArtMethod::ToNativePc(const uint32_t dex_pc) {
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const void* entry_point = GetQuickOatEntryPoint(sizeof(void*));
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MappingTable table(entry_point != nullptr ?
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GetMappingTable(EntryPointToCodePointer(entry_point), sizeof(void*)) : nullptr);
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if (table.TotalSize() == 0) {
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DCHECK_EQ(dex_pc, 0U);
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return 0; // Special no mapping/pc == 0 case
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}
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// Assume the caller wants a dex-to-pc mapping so check here first.
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typedef MappingTable::DexToPcIterator It;
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for (It cur = table.DexToPcBegin(), end = table.DexToPcEnd(); cur != end; ++cur) {
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if (cur.DexPc() == dex_pc) {
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return reinterpret_cast<uintptr_t>(entry_point) + cur.NativePcOffset();
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}
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}
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// Now check pc-to-dex mappings.
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typedef MappingTable::PcToDexIterator It2;
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for (It2 cur = table.PcToDexBegin(), end = table.PcToDexEnd(); cur != end; ++cur) {
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if (cur.DexPc() == dex_pc) {
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return reinterpret_cast<uintptr_t>(entry_point) + cur.NativePcOffset();
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}
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}
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LOG(FATAL) << "Failed to find native offset for dex pc 0x" << std::hex << dex_pc
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<< " in " << PrettyMethod(this);
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return 0;
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}
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uint32_t ArtMethod::FindCatchBlock(Handle<ArtMethod> h_this, Handle<Class> exception_type,
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uint32_t dex_pc, bool* has_no_move_exception) {
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MethodHelper mh(h_this);
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const DexFile::CodeItem* code_item = h_this->GetCodeItem();
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// Set aside the exception while we resolve its type.
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Thread* self = Thread::Current();
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ThrowLocation throw_location;
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StackHandleScope<1> hs(self);
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Handle<mirror::Throwable> exception(hs.NewHandle(self->GetException(&throw_location)));
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bool is_exception_reported = self->IsExceptionReportedToInstrumentation();
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self->ClearException();
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// Default to handler not found.
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uint32_t found_dex_pc = DexFile::kDexNoIndex;
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// Iterate over the catch handlers associated with dex_pc.
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for (CatchHandlerIterator it(*code_item, dex_pc); it.HasNext(); it.Next()) {
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uint16_t iter_type_idx = it.GetHandlerTypeIndex();
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// Catch all case
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if (iter_type_idx == DexFile::kDexNoIndex16) {
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found_dex_pc = it.GetHandlerAddress();
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break;
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}
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// Does this catch exception type apply?
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Class* iter_exception_type = mh.GetClassFromTypeIdx(iter_type_idx);
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if (UNLIKELY(iter_exception_type == nullptr)) {
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// Now have a NoClassDefFoundError as exception. Ignore in case the exception class was
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// removed by a pro-guard like tool.
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// Note: this is not RI behavior. RI would have failed when loading the class.
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self->ClearException();
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// Delete any long jump context as this routine is called during a stack walk which will
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// release its in use context at the end.
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delete self->GetLongJumpContext();
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LOG(WARNING) << "Unresolved exception class when finding catch block: "
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<< DescriptorToDot(h_this->GetTypeDescriptorFromTypeIdx(iter_type_idx));
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} else if (iter_exception_type->IsAssignableFrom(exception_type.Get())) {
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found_dex_pc = it.GetHandlerAddress();
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break;
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}
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}
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if (found_dex_pc != DexFile::kDexNoIndex) {
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const Instruction* first_catch_instr =
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Instruction::At(&code_item->insns_[found_dex_pc]);
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*has_no_move_exception = (first_catch_instr->Opcode() != Instruction::MOVE_EXCEPTION);
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}
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// Put the exception back.
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if (exception.Get() != nullptr) {
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self->SetException(throw_location, exception.Get());
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self->SetExceptionReportedToInstrumentation(is_exception_reported);
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}
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return found_dex_pc;
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}
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void ArtMethod::Invoke(Thread* self, uint32_t* args, uint32_t args_size, JValue* result,
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const char* shorty) {
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if (UNLIKELY(__builtin_frame_address(0) < self->GetStackEnd())) {
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ThrowStackOverflowError(self);
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return;
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}
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if (kIsDebugBuild) {
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self->AssertThreadSuspensionIsAllowable();
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CHECK_EQ(kRunnable, self->GetState());
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CHECK_STREQ(GetShorty(), shorty);
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}
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// Push a transition back into managed code onto the linked list in thread.
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ManagedStack fragment;
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self->PushManagedStackFragment(&fragment);
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Runtime* runtime = Runtime::Current();
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// Call the invoke stub, passing everything as arguments.
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if (UNLIKELY(!runtime->IsStarted())) {
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if (IsStatic()) {
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art::interpreter::EnterInterpreterFromInvoke(self, this, nullptr, args, result);
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} else {
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Object* receiver = reinterpret_cast<StackReference<Object>*>(&args[0])->AsMirrorPtr();
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art::interpreter::EnterInterpreterFromInvoke(self, this, receiver, args + 1, result);
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}
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} else {
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const bool kLogInvocationStartAndReturn = false;
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bool have_quick_code = GetEntryPointFromQuickCompiledCode() != nullptr;
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#if defined(ART_USE_PORTABLE_COMPILER)
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bool have_portable_code = GetEntryPointFromPortableCompiledCode() != nullptr;
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#else
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bool have_portable_code = false;
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#endif
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if (LIKELY(have_quick_code || have_portable_code)) {
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if (kLogInvocationStartAndReturn) {
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LOG(INFO) << StringPrintf("Invoking '%s' %s code=%p", PrettyMethod(this).c_str(),
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have_quick_code ? "quick" : "portable",
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have_quick_code ? GetEntryPointFromQuickCompiledCode()
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#if defined(ART_USE_PORTABLE_COMPILER)
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: GetEntryPointFromPortableCompiledCode());
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#else
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: nullptr);
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#endif
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}
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if (!IsPortableCompiled()) {
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#ifdef __LP64__
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if (!IsStatic()) {
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(*art_quick_invoke_stub)(this, args, args_size, self, result, shorty);
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} else {
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(*art_quick_invoke_static_stub)(this, args, args_size, self, result, shorty);
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}
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#else
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(*art_quick_invoke_stub)(this, args, args_size, self, result, shorty);
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#endif
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} else {
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(*art_portable_invoke_stub)(this, args, args_size, self, result, shorty[0]);
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}
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if (UNLIKELY(self->GetException(nullptr) == Thread::GetDeoptimizationException())) {
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// Unusual case where we were running generated code and an
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// exception was thrown to force the activations to be removed from the
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// stack. Continue execution in the interpreter.
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self->ClearException();
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ShadowFrame* shadow_frame = self->GetAndClearDeoptimizationShadowFrame(result);
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self->SetTopOfStack(nullptr, 0);
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self->SetTopOfShadowStack(shadow_frame);
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interpreter::EnterInterpreterFromDeoptimize(self, shadow_frame, result);
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}
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if (kLogInvocationStartAndReturn) {
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LOG(INFO) << StringPrintf("Returned '%s' %s code=%p", PrettyMethod(this).c_str(),
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have_quick_code ? "quick" : "portable",
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have_quick_code ? GetEntryPointFromQuickCompiledCode()
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#if defined(ART_USE_PORTABLE_COMPILER)
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: GetEntryPointFromPortableCompiledCode());
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#else
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: nullptr);
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#endif
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}
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} else {
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LOG(INFO) << "Not invoking '" << PrettyMethod(this) << "' code=null";
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if (result != NULL) {
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result->SetJ(0);
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}
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}
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}
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// Pop transition.
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self->PopManagedStackFragment(fragment);
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}
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void ArtMethod::RegisterNative(Thread* self, const void* native_method, bool is_fast) {
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DCHECK(Thread::Current() == self);
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CHECK(IsNative()) << PrettyMethod(this);
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CHECK(!IsFastNative()) << PrettyMethod(this);
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CHECK(native_method != NULL) << PrettyMethod(this);
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if (is_fast) {
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SetAccessFlags(GetAccessFlags() | kAccFastNative);
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}
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SetEntryPointFromJni(native_method);
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}
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void ArtMethod::UnregisterNative(Thread* self) {
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CHECK(IsNative() && !IsFastNative()) << PrettyMethod(this);
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// restore stub to lookup native pointer via dlsym
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RegisterNative(self, GetJniDlsymLookupStub(), false);
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}
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} // namespace mirror
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} // namespace art
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