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-rw-r--r--compiler/optimizing/inliner.cc108
-rw-r--r--compiler/optimizing/inliner.h5
-rw-r--r--compiler/optimizing/optimizing_compiler.cc12
-rw-r--r--compiler/optimizing/reference_type_propagation.cc17
-rw-r--r--compiler/optimizing/reference_type_propagation.h7
5 files changed, 128 insertions, 21 deletions
diff --git a/compiler/optimizing/inliner.cc b/compiler/optimizing/inliner.cc
index 5c73fd8696..ea613b2b01 100644
--- a/compiler/optimizing/inliner.cc
+++ b/compiler/optimizing/inliner.cc
@@ -27,6 +27,7 @@
#include "mirror/class_loader.h"
#include "mirror/dex_cache.h"
#include "nodes.h"
+#include "reference_type_propagation.h"
#include "register_allocator.h"
#include "ssa_phi_elimination.h"
#include "scoped_thread_state_change.h"
@@ -57,7 +58,7 @@ void HInliner::Run() {
next_block = (i == blocks.Size() - 1) ? nullptr : blocks.Get(i + 1);
for (HInstruction* instruction = block->GetFirstInstruction(); instruction != nullptr;) {
HInstruction* next = instruction->GetNext();
- HInvokeStaticOrDirect* call = instruction->AsInvokeStaticOrDirect();
+ HInvoke* call = instruction->AsInvoke();
// As long as the call is not intrinsified, it is worth trying to inline.
if (call != nullptr && call->GetIntrinsic() == Intrinsics::kNone) {
// We use the original invoke type to ensure the resolution of the called method
@@ -83,6 +84,79 @@ void HInliner::Run() {
}
}
+static bool IsMethodOrDeclaringClassFinal(ArtMethod* method)
+ SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+ return method->IsFinal() || method->GetDeclaringClass()->IsFinal();
+}
+
+/**
+ * Given the `resolved_method` looked up in the dex cache, try to find
+ * the actual runtime target of an interface or virtual call.
+ * Return nullptr if the runtime target cannot be proven.
+ */
+static ArtMethod* FindVirtualOrInterfaceTarget(HInvoke* invoke, ArtMethod* resolved_method)
+ SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+ if (IsMethodOrDeclaringClassFinal(resolved_method)) {
+ // No need to lookup further, the resolved method will be the target.
+ return resolved_method;
+ }
+
+ HInstruction* receiver = invoke->InputAt(0);
+ if (receiver->IsNullCheck()) {
+ // Due to multiple levels of inlining within the same pass, it might be that
+ // null check does not have the reference type of the actual receiver.
+ receiver = receiver->InputAt(0);
+ }
+ ReferenceTypeInfo info = receiver->GetReferenceTypeInfo();
+ if (info.IsTop()) {
+ // We have no information on the receiver.
+ return nullptr;
+ } else if (!info.IsExact()) {
+ // We currently only support inlining with known receivers.
+ // TODO: Remove this check, we should be able to inline final methods
+ // on unknown receivers.
+ return nullptr;
+ } else if (info.GetTypeHandle()->IsInterface()) {
+ // Statically knowing that the receiver has an interface type cannot
+ // help us find what is the target method.
+ return nullptr;
+ }
+
+ ClassLinker* cl = Runtime::Current()->GetClassLinker();
+ size_t pointer_size = cl->GetImagePointerSize();
+ if (invoke->IsInvokeInterface()) {
+ resolved_method = info.GetTypeHandle()->FindVirtualMethodForInterface(
+ resolved_method, pointer_size);
+ } else {
+ DCHECK(invoke->IsInvokeVirtual());
+ resolved_method = info.GetTypeHandle()->FindVirtualMethodForVirtual(
+ resolved_method, pointer_size);
+ }
+
+ if (resolved_method == nullptr) {
+ // The information we had on the receiver was not enough to find
+ // the target method. Since we check above the exact type of the receiver,
+ // the only reason this can happen is an IncompatibleClassChangeError.
+ return nullptr;
+ } else if (resolved_method->IsAbstract()) {
+ // The information we had on the receiver was not enough to find
+ // the target method. Since we check above the exact type of the receiver,
+ // the only reason this can happen is an IncompatibleClassChangeError.
+ return nullptr;
+ } else if (IsMethodOrDeclaringClassFinal(resolved_method)) {
+ // A final method has to be the target method.
+ return resolved_method;
+ } else if (info.IsExact()) {
+ // If we found a method and the receiver's concrete type is statically
+ // known, we know for sure the target.
+ return resolved_method;
+ } else {
+ // Even if we did find a method, the receiver type was not enough to
+ // statically find the runtime target.
+ return nullptr;
+ }
+}
+
bool HInliner::TryInline(HInvoke* invoke_instruction,
uint32_t method_index,
InvokeType invoke_type) const {
@@ -90,19 +164,34 @@ bool HInliner::TryInline(HInvoke* invoke_instruction,
const DexFile& caller_dex_file = *caller_compilation_unit_.GetDexFile();
VLOG(compiler) << "Try inlining " << PrettyMethod(method_index, caller_dex_file);
- StackHandleScope<3> hs(soa.Self());
- Handle<mirror::DexCache> dex_cache(
- hs.NewHandle(caller_compilation_unit_.GetClassLinker()->FindDexCache(caller_dex_file)));
- Handle<mirror::ClassLoader> class_loader(hs.NewHandle(
- soa.Decode<mirror::ClassLoader*>(caller_compilation_unit_.GetClassLoader())));
- ArtMethod* resolved_method(compiler_driver_->ResolveMethod(
- soa, dex_cache, class_loader, &caller_compilation_unit_, method_index, invoke_type));
+ ArtMethod* resolved_method = nullptr;
+ {
+ // Don't keep this handle scope on stack, otherwise we cannot do a reference type
+ // propagation while inlining.
+ StackHandleScope<2> hs(soa.Self());
+ Handle<mirror::DexCache> dex_cache(
+ hs.NewHandle(caller_compilation_unit_.GetClassLinker()->FindDexCache(caller_dex_file)));
+ Handle<mirror::ClassLoader> class_loader(hs.NewHandle(
+ soa.Decode<mirror::ClassLoader*>(caller_compilation_unit_.GetClassLoader())));
+ resolved_method = compiler_driver_->ResolveMethod(
+ soa, dex_cache, class_loader, &caller_compilation_unit_, method_index, invoke_type);
+ }
if (resolved_method == nullptr) {
VLOG(compiler) << "Method cannot be resolved " << PrettyMethod(method_index, caller_dex_file);
return false;
}
+ if (!invoke_instruction->IsInvokeStaticOrDirect()) {
+ resolved_method = FindVirtualOrInterfaceTarget(invoke_instruction, resolved_method);
+ if (resolved_method == nullptr) {
+ VLOG(compiler) << "Interface or virtual call to "
+ << PrettyMethod(method_index, caller_dex_file)
+ << "could not be statically determined";
+ return false;
+ }
+ }
+
bool same_dex_file = true;
const DexFile& outer_dex_file = *outer_compilation_unit_.GetDexFile();
if (resolved_method->GetDexFile()->GetLocation().compare(outer_dex_file.GetLocation()) != 0) {
@@ -245,11 +334,13 @@ bool HInliner::TryBuildAndInline(ArtMethod* resolved_method,
// Run simple optimizations on the graph.
HDeadCodeElimination dce(callee_graph, stats_);
HConstantFolding fold(callee_graph);
+ ReferenceTypePropagation type_propagation(callee_graph, handles_);
InstructionSimplifier simplify(callee_graph, stats_);
HOptimization* optimizations[] = {
&dce,
&fold,
+ &type_propagation,
&simplify,
};
@@ -263,6 +354,7 @@ bool HInliner::TryBuildAndInline(ArtMethod* resolved_method,
outer_compilation_unit_,
dex_compilation_unit,
compiler_driver_,
+ handles_,
stats_,
depth_ + 1);
inliner.Run();
diff --git a/compiler/optimizing/inliner.h b/compiler/optimizing/inliner.h
index b86c1ed505..ca713329f5 100644
--- a/compiler/optimizing/inliner.h
+++ b/compiler/optimizing/inliner.h
@@ -34,13 +34,15 @@ class HInliner : public HOptimization {
const DexCompilationUnit& outer_compilation_unit,
const DexCompilationUnit& caller_compilation_unit,
CompilerDriver* compiler_driver,
+ StackHandleScopeCollection* handles,
OptimizingCompilerStats* stats,
size_t depth = 0)
: HOptimization(outer_graph, true, kInlinerPassName, stats),
outer_compilation_unit_(outer_compilation_unit),
caller_compilation_unit_(caller_compilation_unit),
compiler_driver_(compiler_driver),
- depth_(depth) {}
+ depth_(depth),
+ handles_(handles) {}
void Run() OVERRIDE;
@@ -57,6 +59,7 @@ class HInliner : public HOptimization {
const DexCompilationUnit& caller_compilation_unit_;
CompilerDriver* const compiler_driver_;
const size_t depth_;
+ StackHandleScopeCollection* const handles_;
DISALLOW_COPY_AND_ASSIGN(HInliner);
};
diff --git a/compiler/optimizing/optimizing_compiler.cc b/compiler/optimizing/optimizing_compiler.cc
index f6ef2f7e82..bf0b9fac0f 100644
--- a/compiler/optimizing/optimizing_compiler.cc
+++ b/compiler/optimizing/optimizing_compiler.cc
@@ -326,7 +326,7 @@ static void RunOptimizations(HGraph* graph,
InstructionSimplifier simplify1(graph, stats);
HBooleanSimplifier boolean_simplify(graph);
- HInliner inliner(graph, dex_compilation_unit, dex_compilation_unit, driver, stats);
+ HInliner inliner(graph, dex_compilation_unit, dex_compilation_unit, driver, handles, stats);
HConstantFolding fold2(graph, "constant_folding_after_inlining");
SideEffectsAnalysis side_effects(graph);
@@ -335,6 +335,8 @@ static void RunOptimizations(HGraph* graph,
BoundsCheckElimination bce(graph);
ReferenceTypePropagation type_propagation(graph, handles);
InstructionSimplifier simplify2(graph, stats, "instruction_simplifier_after_types");
+ InstructionSimplifier simplify3(graph, stats, "last_instruction_simplifier");
+ ReferenceTypePropagation type_propagation2(graph, handles);
IntrinsicsRecognizer intrinsics(graph, driver);
@@ -343,7 +345,12 @@ static void RunOptimizations(HGraph* graph,
&dce1,
&fold1,
&simplify1,
+ &type_propagation,
+ &simplify2,
&inliner,
+ // Run another type propagation phase: inlining will open up more opprotunities
+ // to remove checkast/instanceof and null checks.
+ &type_propagation2,
// BooleanSimplifier depends on the InstructionSimplifier removing redundant
// suspend checks to recognize empty blocks.
&boolean_simplify,
@@ -352,8 +359,7 @@ static void RunOptimizations(HGraph* graph,
&gvn,
&licm,
&bce,
- &type_propagation,
- &simplify2,
+ &simplify3,
&dce2,
};
diff --git a/compiler/optimizing/reference_type_propagation.cc b/compiler/optimizing/reference_type_propagation.cc
index 4f1f45769d..4edadef1a4 100644
--- a/compiler/optimizing/reference_type_propagation.cc
+++ b/compiler/optimizing/reference_type_propagation.cc
@@ -166,31 +166,34 @@ void ReferenceTypePropagation::BoundTypeForIfInstanceOf(HBasicBlock* block) {
}
}
-void ReferenceTypePropagation::SetClassAsTypeInfo(HInstruction* instr, mirror::Class* klass) {
+void ReferenceTypePropagation::SetClassAsTypeInfo(HInstruction* instr,
+ mirror::Class* klass,
+ bool is_exact) {
if (klass != nullptr) {
ScopedObjectAccess soa(Thread::Current());
MutableHandle<mirror::Class> handle = handles_->NewHandle(klass);
- instr->SetReferenceTypeInfo(ReferenceTypeInfo::Create(handle, true));
+ instr->SetReferenceTypeInfo(ReferenceTypeInfo::Create(handle, is_exact));
}
}
void ReferenceTypePropagation::UpdateReferenceTypeInfo(HInstruction* instr,
uint16_t type_idx,
- const DexFile& dex_file) {
+ const DexFile& dex_file,
+ bool is_exact) {
DCHECK_EQ(instr->GetType(), Primitive::kPrimNot);
ScopedObjectAccess soa(Thread::Current());
mirror::DexCache* dex_cache = Runtime::Current()->GetClassLinker()->FindDexCache(dex_file);
// Get type from dex cache assuming it was populated by the verifier.
- SetClassAsTypeInfo(instr, dex_cache->GetResolvedType(type_idx));
+ SetClassAsTypeInfo(instr, dex_cache->GetResolvedType(type_idx), is_exact);
}
void ReferenceTypePropagation::VisitNewInstance(HNewInstance* instr) {
- UpdateReferenceTypeInfo(instr, instr->GetTypeIndex(), instr->GetDexFile());
+ UpdateReferenceTypeInfo(instr, instr->GetTypeIndex(), instr->GetDexFile(), /* is_exact */ true);
}
void ReferenceTypePropagation::VisitNewArray(HNewArray* instr) {
- UpdateReferenceTypeInfo(instr, instr->GetTypeIndex(), instr->GetDexFile());
+ UpdateReferenceTypeInfo(instr, instr->GetTypeIndex(), instr->GetDexFile(), /* is_exact */ true);
}
void ReferenceTypePropagation::UpdateFieldAccessTypeInfo(HInstruction* instr,
@@ -206,7 +209,7 @@ void ReferenceTypePropagation::UpdateFieldAccessTypeInfo(HInstruction* instr,
ArtField* field = cl->GetResolvedField(info.GetFieldIndex(), dex_cache);
DCHECK(field != nullptr);
mirror::Class* klass = field->GetType<false>();
- SetClassAsTypeInfo(instr, klass);
+ SetClassAsTypeInfo(instr, klass, /* is_exact */ false);
}
void ReferenceTypePropagation::VisitInstanceFieldGet(HInstanceFieldGet* instr) {
diff --git a/compiler/optimizing/reference_type_propagation.h b/compiler/optimizing/reference_type_propagation.h
index 74e425fb3e..0a1d4c496e 100644
--- a/compiler/optimizing/reference_type_propagation.h
+++ b/compiler/optimizing/reference_type_propagation.h
@@ -46,14 +46,17 @@ class ReferenceTypePropagation : public HOptimization {
void VisitPhi(HPhi* phi);
void VisitBasicBlock(HBasicBlock* block);
void UpdateFieldAccessTypeInfo(HInstruction* instr, const FieldInfo& info);
- void SetClassAsTypeInfo(HInstruction* instr, mirror::Class* klass);
+ void SetClassAsTypeInfo(HInstruction* instr, mirror::Class* klass, bool is_exact);
void UpdateBoundType(HBoundType* bound_type) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void UpdatePhi(HPhi* phi) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void BoundTypeForIfNotNull(HBasicBlock* block);
void BoundTypeForIfInstanceOf(HBasicBlock* block);
- void UpdateReferenceTypeInfo(HInstruction* instr, uint16_t type_idx, const DexFile& dex_file);
+ void UpdateReferenceTypeInfo(HInstruction* instr,
+ uint16_t type_idx,
+ const DexFile& dex_file,
+ bool is_exact);
void VisitInstanceFieldGet(HInstanceFieldGet* instr);
void VisitStaticFieldGet(HStaticFieldGet* instr);
generated by cgit v1.2.3-59-g8ed1b (git 2.39.0) at 2025-10-21 23:32:03 +0000