/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "mir_field_info.h"
#include <string.h>
#include "base/logging.h"
#include "dex/verified_method.h"
#include "driver/compiler_driver.h"
#include "driver/compiler_driver-inl.h"
#include "mirror/class_loader.h" // Only to allow casts in Handle<ClassLoader>.
#include "mirror/dex_cache.h" // Only to allow casts in Handle<DexCache>.
#include "scoped_thread_state_change.h"
#include "handle_scope-inl.h"
namespace art {
void MirIFieldLoweringInfo::Resolve(CompilerDriver* compiler_driver,
const DexCompilationUnit* mUnit,
MirIFieldLoweringInfo* field_infos, size_t count) {
if (kIsDebugBuild) {
DCHECK(field_infos != nullptr);
DCHECK_NE(count, 0u);
for (auto it = field_infos, end = field_infos + count; it != end; ++it) {
MirIFieldLoweringInfo unresolved(it->field_idx_, it->MemAccessType(), it->IsQuickened());
unresolved.field_offset_ = it->field_offset_;
unresolved.CheckEquals(*it);
}
}
// We're going to resolve fields and check access in a tight loop. It's better to hold
// the lock and needed references once than re-acquiring them again and again.
ScopedObjectAccess soa(Thread::Current());
StackHandleScope<3> hs(soa.Self());
Handle<mirror::DexCache> dex_cache(hs.NewHandle(compiler_driver->GetDexCache(mUnit)));
Handle<mirror::ClassLoader> class_loader(
hs.NewHandle(compiler_driver->GetClassLoader(soa, mUnit)));
Handle<mirror::Class> referrer_class(hs.NewHandle(
compiler_driver->ResolveCompilingMethodsClass(soa, dex_cache, class_loader, mUnit)));
const VerifiedMethod* const verified_method = mUnit->GetVerifiedMethod();
// Even if the referrer class is unresolved (i.e. we're compiling a method without class
// definition) we still want to resolve fields and record all available info.
for (auto it = field_infos, end = field_infos + count; it != end; ++it) {
uint32_t field_idx;
ArtField* resolved_field;
if (!it->IsQuickened()) {
field_idx = it->field_idx_;
resolved_field = compiler_driver->ResolveField(soa, dex_cache, class_loader, mUnit,
field_idx, false);
} else {
const auto mir_offset = it->field_idx_;
// For quickened instructions, it->field_offset_ actually contains the mir offset.
// We need to use the de-quickening info to get dex file / field idx
auto* field_idx_ptr = verified_method->GetDequickenIndex(mir_offset);
CHECK(field_idx_ptr != nullptr);
field_idx = field_idx_ptr->index;
StackHandleScope<1> hs2(soa.Self());
auto h_dex_cache = hs2.NewHandle(compiler_driver->FindDexCache(field_idx_ptr->dex_file));
resolved_field = compiler_driver->ResolveFieldWithDexFile(
soa, h_dex_cache, class_loader, field_idx_ptr->dex_file, field_idx, false);
// Since we don't have a valid field index we can't go slow path later.
CHECK(resolved_field != nullptr);
}
if (UNLIKELY(resolved_field == nullptr)) {
continue;
}
compiler_driver->GetResolvedFieldDexFileLocation(resolved_field,
&it->declaring_dex_file_, &it->declaring_class_idx_, &it->declaring_field_idx_);
bool is_volatile = compiler_driver->IsFieldVolatile(resolved_field);
it->field_offset_ = compiler_driver->GetFieldOffset(resolved_field);
std::pair<bool, bool> fast_path = compiler_driver->IsFastInstanceField(
dex_cache.Get(), referrer_class.Get(), resolved_field, field_idx);
it->flags_ = 0u | // Without kFlagIsStatic.
(it->flags_ & (kMemAccessTypeMask << kBitMemAccessTypeBegin)) |
(is_volatile ? kFlagIsVolatile : 0u) |
(fast_path.first ? kFlagFastGet : 0u) |
(fast_path.second ? kFlagFastPut : 0u);
}
}
void MirSFieldLoweringInfo::Resolve(CompilerDriver* compiler_driver,
const DexCompilationUnit* mUnit,
MirSFieldLoweringInfo* field_infos, size_t count) {
if (kIsDebugBuild) {
DCHECK(field_infos != nullptr);
DCHECK_NE(count, 0u);
for (auto it = field_infos, end = field_infos + count; it != end; ++it) {
MirSFieldLoweringInfo unresolved(it->field_idx_, it->MemAccessType());
// In 64-bit builds, there's padding after storage_index_, don't include it in memcmp.
size_t size = OFFSETOF_MEMBER(MirSFieldLoweringInfo, storage_index_) +
sizeof(it->storage_index_);
DCHECK_EQ(memcmp(&unresolved, &*it, size), 0);
}
}
// We're going to resolve fields and check access in a tight loop. It's better to hold
// the lock and needed references once than re-acquiring them again and again.
ScopedObjectAccess soa(Thread::Current());
StackHandleScope<3> hs(soa.Self());
Handle<mirror::DexCache> dex_cache(hs.NewHandle(compiler_driver->GetDexCache(mUnit)));
Handle<mirror::ClassLoader> class_loader(
hs.NewHandle(compiler_driver->GetClassLoader(soa, mUnit)));
Handle<mirror::Class> referrer_class_handle(hs.NewHandle(
compiler_driver->ResolveCompilingMethodsClass(soa, dex_cache, class_loader, mUnit)));
// Even if the referrer class is unresolved (i.e. we're compiling a method without class
// definition) we still want to resolve fields and record all available info.
for (auto it = field_infos, end = field_infos + count; it != end; ++it) {
uint32_t field_idx = it->field_idx_;
ArtField* resolved_field =
compiler_driver->ResolveField(soa, dex_cache, class_loader, mUnit, field_idx, true);
if (UNLIKELY(resolved_field == nullptr)) {
continue;
}
compiler_driver->GetResolvedFieldDexFileLocation(resolved_field,
&it->declaring_dex_file_, &it->declaring_class_idx_, &it->declaring_field_idx_);
bool is_volatile = compiler_driver->IsFieldVolatile(resolved_field) ? 1u : 0u;
mirror::Class* referrer_class = referrer_class_handle.Get();
std::pair<bool, bool> fast_path = compiler_driver->IsFastStaticField(
dex_cache.Get(), referrer_class, resolved_field, field_idx, &it->storage_index_);
uint16_t flags = kFlagIsStatic |
(it->flags_ & (kMemAccessTypeMask << kBitMemAccessTypeBegin)) |
(is_volatile ? kFlagIsVolatile : 0u) |
(fast_path.first ? kFlagFastGet : 0u) |
(fast_path.second ? kFlagFastPut : 0u);
if (fast_path.first) {
it->field_offset_ = compiler_driver->GetFieldOffset(resolved_field);
bool is_referrers_class =
compiler_driver->IsStaticFieldInReferrerClass(referrer_class, resolved_field);
bool is_class_initialized =
compiler_driver->IsStaticFieldsClassInitialized(referrer_class, resolved_field);
bool is_class_in_dex_cache = !is_referrers_class && // If referrer's class, we don't care.
compiler_driver->CanAssumeTypeIsPresentInDexCache(*dex_cache->GetDexFile(),
it->storage_index_);
flags |= (is_referrers_class ? kFlagIsReferrersClass : 0u) |
(is_class_initialized ? kFlagClassIsInitialized : 0u) |
(is_class_in_dex_cache ? kFlagClassIsInDexCache : 0u);
}
it->flags_ = flags;
}
}
} // namespace art