Martin Kustermann
c522e79a0b
This CL introduces a mechanism to allow a stub to use a pc-relative tail-call to another stub by populating the code's static_calls table. We use this in allocation stubs which can tail-call the generic object allocation stub. Flutter gallery total size: - armv7: -0.72% - armv8: -0.88% Issue https://github.com/dart-lang/sdk/issues/41509 Issue https://github.com/dart-lang/sdk/issues/41426 Change-Id: I6afafe2a357b7833da843403f90281aee363a95b Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/142987 Commit-Queue: Martin Kustermann <kustermann@google.com> Reviewed-by: Daco Harkes <dacoharkes@google.com>
322 lines
11 KiB
C++
322 lines
11 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
|
|
// for details. All rights reserved. Use of this source code is governed by a
|
|
// BSD-style license that can be found in the LICENSE file.
|
|
|
|
#include "vm/stub_code.h"
|
|
|
|
#include "platform/assert.h"
|
|
#include "platform/globals.h"
|
|
#include "vm/clustered_snapshot.h"
|
|
#include "vm/compiler/aot/precompiler.h"
|
|
#include "vm/compiler/assembler/assembler.h"
|
|
#include "vm/compiler/assembler/disassembler.h"
|
|
#include "vm/flags.h"
|
|
#include "vm/heap/safepoint.h"
|
|
#include "vm/interpreter.h"
|
|
#include "vm/object_store.h"
|
|
#include "vm/snapshot.h"
|
|
#include "vm/virtual_memory.h"
|
|
#include "vm/visitor.h"
|
|
|
|
namespace dart {
|
|
|
|
DEFINE_FLAG(bool, disassemble_stubs, false, "Disassemble generated stubs.");
|
|
DECLARE_FLAG(bool, precompiled_mode);
|
|
|
|
DECLARE_FLAG(bool, enable_interpreter);
|
|
|
|
StubCode::StubCodeEntry StubCode::entries_[kNumStubEntries] = {
|
|
#if defined(DART_PRECOMPILED_RUNTIME)
|
|
#define STUB_CODE_DECLARE(name) {nullptr, #name},
|
|
#else
|
|
#define STUB_CODE_DECLARE(name) \
|
|
{nullptr, #name, compiler::StubCodeCompiler::Generate##name##Stub},
|
|
#endif
|
|
VM_STUB_CODE_LIST(STUB_CODE_DECLARE)
|
|
#undef STUB_CODE_DECLARE
|
|
};
|
|
|
|
#if defined(DART_PRECOMPILED_RUNTIME)
|
|
void StubCode::Init() {
|
|
// Stubs will be loaded from the snapshot.
|
|
UNREACHABLE();
|
|
}
|
|
|
|
#else
|
|
|
|
void StubCode::Init() {
|
|
compiler::ObjectPoolBuilder object_pool_builder;
|
|
|
|
// Generate all the stubs.
|
|
for (size_t i = 0; i < ARRAY_SIZE(entries_); i++) {
|
|
entries_[i].code = Code::ReadOnlyHandle();
|
|
*(entries_[i].code) =
|
|
Generate(entries_[i].name, &object_pool_builder, entries_[i].generator);
|
|
}
|
|
|
|
const ObjectPool& object_pool =
|
|
ObjectPool::Handle(ObjectPool::NewFromBuilder(object_pool_builder));
|
|
|
|
for (size_t i = 0; i < ARRAY_SIZE(entries_); i++) {
|
|
entries_[i].code->set_object_pool(object_pool.raw());
|
|
}
|
|
}
|
|
|
|
#undef STUB_CODE_GENERATE
|
|
#undef STUB_CODE_SET_OBJECT_POOL
|
|
|
|
RawCode* StubCode::Generate(
|
|
const char* name,
|
|
compiler::ObjectPoolBuilder* object_pool_builder,
|
|
void (*GenerateStub)(compiler::Assembler* assembler)) {
|
|
compiler::Assembler assembler(object_pool_builder);
|
|
GenerateStub(&assembler);
|
|
const Code& code = Code::Handle(Code::FinalizeCodeAndNotify(
|
|
name, nullptr, &assembler, Code::PoolAttachment::kNotAttachPool,
|
|
/*optimized=*/false));
|
|
#ifndef PRODUCT
|
|
if (FLAG_support_disassembler && FLAG_disassemble_stubs) {
|
|
Disassembler::DisassembleStub(name, code);
|
|
}
|
|
#endif // !PRODUCT
|
|
return code.raw();
|
|
}
|
|
#endif // defined(DART_PRECOMPILED_RUNTIME)
|
|
|
|
void StubCode::Cleanup() {
|
|
for (size_t i = 0; i < ARRAY_SIZE(entries_); i++) {
|
|
entries_[i].code = nullptr;
|
|
}
|
|
}
|
|
|
|
bool StubCode::HasBeenInitialized() {
|
|
// Use AsynchronousGapMarker as canary.
|
|
return entries_[kAsynchronousGapMarkerIndex].code != nullptr;
|
|
}
|
|
|
|
bool StubCode::InInvocationStub(uword pc, bool is_interpreted_frame) {
|
|
ASSERT(HasBeenInitialized());
|
|
#if !defined(DART_PRECOMPILED_RUNTIME)
|
|
if (FLAG_enable_interpreter) {
|
|
if (is_interpreted_frame) {
|
|
// Recognize special marker set up by interpreter in entry frame.
|
|
return Interpreter::IsEntryFrameMarker(
|
|
reinterpret_cast<const KBCInstr*>(pc));
|
|
}
|
|
{
|
|
uword entry = StubCode::InvokeDartCodeFromBytecode().EntryPoint();
|
|
uword size = StubCode::InvokeDartCodeFromBytecodeSize();
|
|
if ((pc >= entry) && (pc < (entry + size))) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
#endif // !defined(DART_PRECOMPILED_RUNTIME)
|
|
uword entry = StubCode::InvokeDartCode().EntryPoint();
|
|
uword size = StubCode::InvokeDartCodeSize();
|
|
return (pc >= entry) && (pc < (entry + size));
|
|
}
|
|
|
|
bool StubCode::InJumpToFrameStub(uword pc) {
|
|
ASSERT(HasBeenInitialized());
|
|
uword entry = StubCode::JumpToFrame().EntryPoint();
|
|
uword size = StubCode::JumpToFrameSize();
|
|
return (pc >= entry) && (pc < (entry + size));
|
|
}
|
|
|
|
#if !defined(DART_PRECOMPILED_RUNTIME)
|
|
static RawArray* BuildStaticCallsTable(
|
|
Zone* zone,
|
|
compiler::UnresolvedPcRelativeCalls* unresolved_calls) {
|
|
if (unresolved_calls->length() == 0) {
|
|
return Array::null();
|
|
}
|
|
const intptr_t array_length =
|
|
unresolved_calls->length() * Code::kSCallTableEntryLength;
|
|
const auto& static_calls_table =
|
|
Array::Handle(zone, Array::New(array_length, Heap::kOld));
|
|
StaticCallsTable entries(static_calls_table);
|
|
auto& kind_type_and_offset = Smi::Handle(zone);
|
|
for (intptr_t i = 0; i < unresolved_calls->length(); i++) {
|
|
auto& unresolved_call = (*unresolved_calls)[i];
|
|
auto call_kind = unresolved_call->is_tail_call() ? Code::kPcRelativeTailCall
|
|
: Code::kPcRelativeCall;
|
|
kind_type_and_offset =
|
|
Smi::New(Code::KindField::encode(call_kind) |
|
|
Code::EntryPointField::encode(Code::kDefaultEntry) |
|
|
Code::OffsetField::encode(unresolved_call->offset()));
|
|
auto view = entries[i];
|
|
view.Set<Code::kSCallTableKindAndOffset>(kind_type_and_offset);
|
|
view.Set<Code::kSCallTableCodeTarget>(unresolved_call->target());
|
|
}
|
|
return static_calls_table.raw();
|
|
}
|
|
#endif // !defined(DART_PRECOMPILED_RUNTIME)
|
|
|
|
RawCode* StubCode::GetAllocationStubForClass(const Class& cls) {
|
|
Thread* thread = Thread::Current();
|
|
auto object_store = thread->isolate()->object_store();
|
|
Zone* zone = thread->zone();
|
|
const Error& error = Error::Handle(zone, cls.EnsureIsFinalized(thread));
|
|
ASSERT(error.IsNull());
|
|
if (cls.id() == kArrayCid) {
|
|
return object_store->allocate_array_stub();
|
|
} else if (cls.id() == kContextCid) {
|
|
return object_store->allocate_context_stub();
|
|
}
|
|
Code& stub = Code::Handle(zone, cls.allocation_stub());
|
|
#if !defined(DART_PRECOMPILED_RUNTIME)
|
|
if (stub.IsNull()) {
|
|
compiler::ObjectPoolBuilder object_pool_builder;
|
|
Precompiler* precompiler = Precompiler::Instance();
|
|
|
|
compiler::ObjectPoolBuilder* wrapper =
|
|
FLAG_use_bare_instructions && precompiler != NULL
|
|
? precompiler->global_object_pool_builder()
|
|
: &object_pool_builder;
|
|
|
|
const auto pool_attachment =
|
|
FLAG_precompiled_mode && FLAG_use_bare_instructions
|
|
? Code::PoolAttachment::kNotAttachPool
|
|
: Code::PoolAttachment::kAttachPool;
|
|
|
|
auto zone = thread->zone();
|
|
auto object_store = thread->isolate()->object_store();
|
|
auto& allocate_object_stub = Code::ZoneHandle(zone);
|
|
auto& allocate_object_parametrized_stub = Code::ZoneHandle(zone);
|
|
if (FLAG_precompiled_mode && FLAG_use_bare_instructions) {
|
|
allocate_object_stub = object_store->allocate_object_stub();
|
|
allocate_object_parametrized_stub =
|
|
object_store->allocate_object_parametrized_stub();
|
|
}
|
|
|
|
compiler::Assembler assembler(wrapper);
|
|
compiler::UnresolvedPcRelativeCalls unresolved_calls;
|
|
const char* name = cls.ToCString();
|
|
compiler::StubCodeCompiler::GenerateAllocationStubForClass(
|
|
&assembler, &unresolved_calls, cls, allocate_object_stub,
|
|
allocate_object_parametrized_stub);
|
|
|
|
const auto& static_calls_table =
|
|
Array::Handle(zone, BuildStaticCallsTable(zone, &unresolved_calls));
|
|
|
|
auto mutator_fun = [&]() {
|
|
stub = Code::FinalizeCode(nullptr, &assembler, pool_attachment,
|
|
/*optimized=*/false,
|
|
/*stats=*/nullptr);
|
|
// Check if background compilation thread has not already added the stub.
|
|
if (cls.allocation_stub() == Code::null()) {
|
|
stub.set_owner(cls);
|
|
if (!static_calls_table.IsNull()) {
|
|
stub.set_static_calls_target_table(static_calls_table);
|
|
}
|
|
cls.set_allocation_stub(stub);
|
|
}
|
|
};
|
|
auto bg_compiler_fun = [&]() {
|
|
ForceGrowthSafepointOperationScope safepoint_scope(thread);
|
|
stub = cls.allocation_stub();
|
|
// Check if stub was already generated.
|
|
if (!stub.IsNull()) {
|
|
return;
|
|
}
|
|
stub = Code::FinalizeCode(nullptr, &assembler, pool_attachment,
|
|
/*optimized=*/false, /*stats=*/nullptr);
|
|
stub.set_owner(cls);
|
|
if (!static_calls_table.IsNull()) {
|
|
stub.set_static_calls_target_table(static_calls_table);
|
|
}
|
|
cls.set_allocation_stub(stub);
|
|
};
|
|
|
|
// We have to ensure no mutators are running, because:
|
|
//
|
|
// a) We allocate an instructions object, which might cause us to
|
|
// temporarily flip page protections from (RX -> RW -> RX).
|
|
//
|
|
// b) To ensure only one thread succeeds installing an allocation for the
|
|
// given class.
|
|
//
|
|
thread->isolate_group()->RunWithStoppedMutators(
|
|
mutator_fun, bg_compiler_fun, /*use_force_growth=*/true);
|
|
|
|
// We notify code observers after finalizing the code in order to be
|
|
// outside a [SafepointOperationScope].
|
|
Code::NotifyCodeObservers(name, stub, /*optimized=*/false);
|
|
#ifndef PRODUCT
|
|
if (FLAG_support_disassembler && FLAG_disassemble_stubs) {
|
|
Disassembler::DisassembleStub(name, stub);
|
|
}
|
|
#endif // !PRODUCT
|
|
}
|
|
#endif // !defined(DART_PRECOMPILED_RUNTIME)
|
|
return stub.raw();
|
|
}
|
|
|
|
#if !defined(TARGET_ARCH_IA32)
|
|
RawCode* StubCode::GetBuildMethodExtractorStub(
|
|
compiler::ObjectPoolBuilder* pool) {
|
|
#if !defined(DART_PRECOMPILED_RUNTIME)
|
|
auto thread = Thread::Current();
|
|
auto Z = thread->zone();
|
|
auto object_store = thread->isolate()->object_store();
|
|
|
|
const auto& closure_class =
|
|
Class::ZoneHandle(Z, object_store->closure_class());
|
|
const auto& closure_allocation_stub =
|
|
Code::ZoneHandle(Z, StubCode::GetAllocationStubForClass(closure_class));
|
|
const auto& context_allocation_stub = StubCode::AllocateContext();
|
|
|
|
compiler::ObjectPoolBuilder object_pool_builder;
|
|
compiler::Assembler assembler(pool != nullptr ? pool : &object_pool_builder);
|
|
compiler::StubCodeCompiler::GenerateBuildMethodExtractorStub(
|
|
&assembler, closure_allocation_stub, context_allocation_stub);
|
|
|
|
const char* name = "BuildMethodExtractor";
|
|
const Code& stub = Code::Handle(Code::FinalizeCodeAndNotify(
|
|
name, nullptr, &assembler, Code::PoolAttachment::kNotAttachPool,
|
|
/*optimized=*/false));
|
|
|
|
if (pool == nullptr) {
|
|
stub.set_object_pool(ObjectPool::NewFromBuilder(object_pool_builder));
|
|
}
|
|
|
|
#ifndef PRODUCT
|
|
if (FLAG_support_disassembler && FLAG_disassemble_stubs) {
|
|
Disassembler::DisassembleStub(name, stub);
|
|
}
|
|
#endif // !PRODUCT
|
|
return stub.raw();
|
|
#else // !defined(DART_PRECOMPILED_RUNTIME)
|
|
UNIMPLEMENTED();
|
|
return nullptr;
|
|
#endif // !defined(DART_PRECOMPILED_RUNTIME)
|
|
}
|
|
#endif // !defined(TARGET_ARCH_IA32)
|
|
|
|
const Code& StubCode::UnoptimizedStaticCallEntry(intptr_t num_args_tested) {
|
|
switch (num_args_tested) {
|
|
case 0:
|
|
return ZeroArgsUnoptimizedStaticCall();
|
|
case 1:
|
|
return OneArgUnoptimizedStaticCall();
|
|
case 2:
|
|
return TwoArgsUnoptimizedStaticCall();
|
|
default:
|
|
UNIMPLEMENTED();
|
|
return Code::Handle();
|
|
}
|
|
}
|
|
|
|
const char* StubCode::NameOfStub(uword entry_point) {
|
|
for (size_t i = 0; i < ARRAY_SIZE(entries_); i++) {
|
|
if ((entries_[i].code != nullptr) && !entries_[i].code->IsNull() &&
|
|
(entries_[i].code->EntryPoint() == entry_point)) {
|
|
return entries_[i].name;
|
|
}
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
} // namespace dart
|