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-rw-r--r--compiler/dex/gvn_dead_code_elimination.cc5
-rw-r--r--compiler/dex/gvn_dead_code_elimination_test.cc85
-rw-r--r--compiler/driver/compiler_driver-inl.h25
-rw-r--r--compiler/driver/compiler_driver.cc21
-rw-r--r--compiler/driver/compiler_driver.h10
-rw-r--r--compiler/optimizing/dead_code_elimination.cc4
-rw-r--r--compiler/optimizing/nodes.cc5
-rw-r--r--compiler/optimizing/nodes.h1
-rw-r--r--runtime/oat.h2
-rw-r--r--test/Android.run-test.mk3
10 files changed, 148 insertions, 13 deletions
diff --git a/compiler/dex/gvn_dead_code_elimination.cc b/compiler/dex/gvn_dead_code_elimination.cc
index 6d8a7dab2b..b1f5d870d4 100644
--- a/compiler/dex/gvn_dead_code_elimination.cc
+++ b/compiler/dex/gvn_dead_code_elimination.cc
@@ -1003,7 +1003,6 @@ bool GvnDeadCodeElimination::BackwardPassTryToKillLastMIR() {
vreg_chains_.GetMIRData(kill_heads_[v_reg])->PrevChange(v_reg));
}
}
- unused_vregs_->Union(vregs_to_kill_);
for (auto it = changes_to_kill_.rbegin(), end = changes_to_kill_.rend(); it != end; ++it) {
MIRData* data = vreg_chains_.GetMIRData(*it);
DCHECK(!data->must_keep);
@@ -1012,6 +1011,10 @@ bool GvnDeadCodeElimination::BackwardPassTryToKillLastMIR() {
KillMIR(data);
}
+ // Each dependent register not in vregs_to_kill_ is either already marked unused or
+ // it's one word of a wide register where the other word has been overwritten.
+ unused_vregs_->UnionIfNotIn(dependent_vregs_, vregs_to_kill_);
+
vreg_chains_.RemoveTrailingNops();
return true;
}
diff --git a/compiler/dex/gvn_dead_code_elimination_test.cc b/compiler/dex/gvn_dead_code_elimination_test.cc
index de591d0edb..461c844a60 100644
--- a/compiler/dex/gvn_dead_code_elimination_test.cc
+++ b/compiler/dex/gvn_dead_code_elimination_test.cc
@@ -137,6 +137,8 @@ class GvnDeadCodeEliminationTest : public testing::Test {
{ bb, opcode, 0u, 0u, 1, { src1 }, 1, { result } }
#define DEF_BINOP(bb, opcode, result, src1, src2) \
{ bb, opcode, 0u, 0u, 2, { src1, src2 }, 1, { result } }
+#define DEF_BINOP_WIDE(bb, opcode, result, src1, src2) \
+ { bb, opcode, 0u, 0u, 4, { src1, src1 + 1, src2, src2 + 1 }, 2, { result, result + 1 } }
void DoPrepareIFields(const IFieldDef* defs, size_t count) {
cu_.mir_graph->ifield_lowering_infos_.clear();
@@ -1936,7 +1938,7 @@ TEST_F(GvnDeadCodeEliminationTestSimple, MixedOverlaps1) {
DEF_CONST(3, Instruction::CONST, 0u, 1000u),
DEF_MOVE(3, Instruction::MOVE, 1u, 0u),
DEF_CONST(3, Instruction::CONST, 2u, 2000u),
- { 3, Instruction::INT_TO_LONG, 0, 0u, 1, { 2u }, 2, { 3u, 4u} },
+ { 3, Instruction::INT_TO_LONG, 0, 0u, 1, { 2u }, 2, { 3u, 4u } },
DEF_MOVE_WIDE(3, Instruction::MOVE_WIDE, 5u, 3u),
DEF_CONST(3, Instruction::CONST, 7u, 3000u),
DEF_CONST(3, Instruction::CONST, 8u, 4000u),
@@ -1983,4 +1985,85 @@ TEST_F(GvnDeadCodeEliminationTestSimple, MixedOverlaps1) {
EXPECT_EQ(0u, int_to_long->dalvikInsn.vB);
}
+TEST_F(GvnDeadCodeEliminationTestSimple, UnusedRegs1) {
+ static const MIRDef mirs[] = {
+ DEF_CONST(3, Instruction::CONST, 0u, 1000u),
+ DEF_CONST(3, Instruction::CONST, 1u, 2000u),
+ DEF_BINOP(3, Instruction::ADD_INT, 2u, 1u, 0u),
+ DEF_CONST(3, Instruction::CONST, 3u, 1000u), // NOT killed (b/21702651).
+ DEF_BINOP(3, Instruction::ADD_INT, 4u, 1u, 3u), // Killed (RecordPass)
+ DEF_CONST(3, Instruction::CONST, 5u, 2000u), // Killed with 9u (BackwardPass)
+ DEF_BINOP(3, Instruction::ADD_INT, 6u, 5u, 0u), // Killed (RecordPass)
+ DEF_CONST(3, Instruction::CONST, 7u, 4000u),
+ DEF_MOVE(3, Instruction::MOVE, 8u, 0u), // Killed with 6u (BackwardPass)
+ };
+
+ static const int32_t sreg_to_vreg_map[] = { 1, 2, 3, 0, 3, 0, 3, 4, 0 };
+ PrepareSRegToVRegMap(sreg_to_vreg_map);
+
+ PrepareMIRs(mirs);
+ PerformGVN_DCE();
+
+ ASSERT_EQ(arraysize(mirs), value_names_.size());
+ static const size_t diff_indexes[] = { 0, 1, 2, 7 };
+ ExpectValueNamesNE(diff_indexes);
+ EXPECT_EQ(value_names_[0], value_names_[3]);
+ EXPECT_EQ(value_names_[2], value_names_[4]);
+ EXPECT_EQ(value_names_[1], value_names_[5]);
+ EXPECT_EQ(value_names_[2], value_names_[6]);
+ EXPECT_EQ(value_names_[0], value_names_[8]);
+
+ static const bool eliminated[] = {
+ false, false, false, false, true, true, true, false, true,
+ };
+ static_assert(arraysize(eliminated) == arraysize(mirs), "array size mismatch");
+ for (size_t i = 0; i != arraysize(eliminated); ++i) {
+ bool actually_eliminated = (static_cast<int>(mirs_[i].dalvikInsn.opcode) == kMirOpNop);
+ EXPECT_EQ(eliminated[i], actually_eliminated) << i;
+ }
+}
+
+TEST_F(GvnDeadCodeEliminationTestSimple, UnusedRegs2) {
+ static const MIRDef mirs[] = {
+ DEF_CONST(3, Instruction::CONST, 0u, 1000u),
+ DEF_CONST(3, Instruction::CONST, 1u, 2000u),
+ DEF_BINOP(3, Instruction::ADD_INT, 2u, 1u, 0u),
+ DEF_CONST(3, Instruction::CONST, 3u, 1000u), // Killed (BackwardPass; b/21702651)
+ DEF_BINOP(3, Instruction::ADD_INT, 4u, 1u, 3u), // Killed (RecordPass)
+ DEF_CONST_WIDE(3, Instruction::CONST_WIDE, 5u, 4000u),
+ { 3, Instruction::LONG_TO_INT, 0, 0u, 2, { 5u, 6u }, 1, { 7u } },
+ DEF_BINOP(3, Instruction::ADD_INT, 8u, 7u, 0u),
+ DEF_CONST_WIDE(3, Instruction::CONST_WIDE, 9u, 4000u), // Killed with 12u (BackwardPass)
+ DEF_CONST(3, Instruction::CONST, 11u, 6000u),
+ { 3, Instruction::LONG_TO_INT, 0, 0u, 2, { 9u, 10u }, 1, { 12u } }, // Killed with 9u (BP)
+ };
+
+ static const int32_t sreg_to_vreg_map[] = {
+ 2, 3, 4, 1, 4, 5, 6 /* high word */, 0, 7, 0, 1 /* high word */, 8, 0
+ };
+ PrepareSRegToVRegMap(sreg_to_vreg_map);
+
+ PrepareMIRs(mirs);
+ static const int32_t wide_sregs[] = { 5, 9 };
+ MarkAsWideSRegs(wide_sregs);
+ PerformGVN_DCE();
+
+ ASSERT_EQ(arraysize(mirs), value_names_.size());
+ static const size_t diff_indexes[] = { 0, 1, 2, 5, 6, 7, 9 };
+ ExpectValueNamesNE(diff_indexes);
+ EXPECT_EQ(value_names_[0], value_names_[3]);
+ EXPECT_EQ(value_names_[2], value_names_[4]);
+ EXPECT_EQ(value_names_[5], value_names_[8]);
+ EXPECT_EQ(value_names_[6], value_names_[10]);
+
+ static const bool eliminated[] = {
+ false, false, false, true, true, false, false, false, true, false, true,
+ };
+ static_assert(arraysize(eliminated) == arraysize(mirs), "array size mismatch");
+ for (size_t i = 0; i != arraysize(eliminated); ++i) {
+ bool actually_eliminated = (static_cast<int>(mirs_[i].dalvikInsn.opcode) == kMirOpNop);
+ EXPECT_EQ(eliminated[i], actually_eliminated) << i;
+ }
+}
+
} // namespace art
diff --git a/compiler/driver/compiler_driver-inl.h b/compiler/driver/compiler_driver-inl.h
index b25e967609..e0c56fcc82 100644
--- a/compiler/driver/compiler_driver-inl.h
+++ b/compiler/driver/compiler_driver-inl.h
@@ -233,11 +233,32 @@ inline bool CompilerDriver::IsStaticFieldInReferrerClass(mirror::Class* referrer
return referrer_class == fields_class;
}
+inline bool CompilerDriver::CanAssumeClassIsInitialized(mirror::Class* klass) {
+ // Being loaded is a pre-requisite for being initialized but let's do the cheap check first.
+ //
+ // NOTE: When AOT compiling an app, we eagerly initialize app classes (and potentially their
+ // super classes in the boot image) but only those that have a trivial initialization, i.e.
+ // without <clinit>() or static values in the dex file for that class or any of its super
+ // classes. So while we could see the klass as initialized during AOT compilation and have
+ // it only loaded at runtime, the needed initialization would have to be trivial and
+ // unobservable from Java, so we may as well treat it as initialized.
+ if (!klass->IsInitialized()) {
+ return false;
+ }
+ return CanAssumeClassIsLoaded(klass);
+}
+
+inline bool CompilerDriver::CanReferrerAssumeClassIsInitialized(mirror::Class* referrer_class,
+ mirror::Class* klass) {
+ return (referrer_class != nullptr && referrer_class->IsSubClass(klass)) ||
+ CanAssumeClassIsInitialized(klass);
+}
+
inline bool CompilerDriver::IsStaticFieldsClassInitialized(mirror::Class* referrer_class,
ArtField* resolved_field) {
DCHECK(resolved_field->IsStatic());
mirror::Class* fields_class = resolved_field->GetDeclaringClass();
- return fields_class == referrer_class || fields_class->IsInitialized();
+ return CanReferrerAssumeClassIsInitialized(referrer_class, fields_class);
}
inline ArtMethod* CompilerDriver::ResolveMethod(
@@ -394,7 +415,7 @@ inline bool CompilerDriver::IsMethodsClassInitialized(mirror::Class* referrer_cl
return true;
}
mirror::Class* methods_class = resolved_method->GetDeclaringClass();
- return methods_class == referrer_class || methods_class->IsInitialized();
+ return CanReferrerAssumeClassIsInitialized(referrer_class, methods_class);
}
} // namespace art
diff --git a/compiler/driver/compiler_driver.cc b/compiler/driver/compiler_driver.cc
index 22fcf87524..84b6a52bda 100644
--- a/compiler/driver/compiler_driver.cc
+++ b/compiler/driver/compiler_driver.cc
@@ -659,7 +659,8 @@ void CompilerDriver::PreCompile(jobject class_loader, const std::vector<const De
bool CompilerDriver::IsImageClass(const char* descriptor) const {
if (!IsImage()) {
- return true;
+ // NOTE: Currently unreachable, all callers check IsImage().
+ return false;
} else {
return image_classes_->find(descriptor) != image_classes_->end();
}
@@ -992,6 +993,24 @@ void CompilerDriver::UpdateImageClasses(TimingLogger* timings) {
}
}
+bool CompilerDriver::CanAssumeClassIsLoaded(mirror::Class* klass) {
+ Runtime* runtime = Runtime::Current();
+ if (!runtime->IsAotCompiler()) {
+ DCHECK(runtime->UseJit());
+ // Having the klass reference here implies that the klass is already loaded.
+ return true;
+ }
+ if (!IsImage()) {
+ // Assume loaded only if klass is in the boot image. App classes cannot be assumed
+ // loaded because we don't even know what class loader will be used to load them.
+ bool class_in_image = runtime->GetHeap()->FindSpaceFromObject(klass, false)->IsImageSpace();
+ return class_in_image;
+ }
+ std::string temp;
+ const char* descriptor = klass->GetDescriptor(&temp);
+ return IsImageClass(descriptor);
+}
+
bool CompilerDriver::CanAssumeTypeIsPresentInDexCache(const DexFile& dex_file, uint32_t type_idx) {
if (IsImage() &&
IsImageClass(dex_file.StringDataByIdx(dex_file.GetTypeId(type_idx).descriptor_idx_))) {
diff --git a/compiler/driver/compiler_driver.h b/compiler/driver/compiler_driver.h
index 68c905eb22..f737007308 100644
--- a/compiler/driver/compiler_driver.h
+++ b/compiler/driver/compiler_driver.h
@@ -501,6 +501,16 @@ class CompilerDriver {
uint32_t field_idx)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+ // Can we assume that the klass is initialized?
+ bool CanAssumeClassIsInitialized(mirror::Class* klass)
+ SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+ bool CanReferrerAssumeClassIsInitialized(mirror::Class* referrer_class, mirror::Class* klass)
+ SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+
+ // Can we assume that the klass is loaded?
+ bool CanAssumeClassIsLoaded(mirror::Class* klass)
+ SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+
// These flags are internal to CompilerDriver for collecting INVOKE resolution statistics.
// The only external contract is that unresolved method has flags 0 and resolved non-0.
enum {
diff --git a/compiler/optimizing/dead_code_elimination.cc b/compiler/optimizing/dead_code_elimination.cc
index 17a006cc3a..fdfe518e95 100644
--- a/compiler/optimizing/dead_code_elimination.cc
+++ b/compiler/optimizing/dead_code_elimination.cc
@@ -122,10 +122,6 @@ void HDeadCodeElimination::RemoveDeadInstructions() {
if (!inst->HasSideEffects()
&& !inst->CanThrow()
&& !inst->IsSuspendCheck()
- // The current method needs to stay in the graph in case of inlining.
- // It is always passed anyway, and keeping it in the graph does not
- // affect the generated code.
- && !inst->IsCurrentMethod()
// If we added an explicit barrier then we should keep it.
&& !inst->IsMemoryBarrier()
&& !inst->HasUses()) {
diff --git a/compiler/optimizing/nodes.cc b/compiler/optimizing/nodes.cc
index 830d84ba50..68c197e607 100644
--- a/compiler/optimizing/nodes.cc
+++ b/compiler/optimizing/nodes.cc
@@ -299,7 +299,10 @@ HNullConstant* HGraph::GetNullConstant() {
}
HCurrentMethod* HGraph::GetCurrentMethod() {
- if (cached_current_method_ == nullptr) {
+ // For simplicity, don't bother reviving the cached current method if it is
+ // not null and not in a block. Otherwise, we need to clear the instruction
+ // id and/or any invariants the graph is assuming when adding new instructions.
+ if ((cached_current_method_ == nullptr) || (cached_current_method_->GetBlock() == nullptr)) {
cached_current_method_ = new (arena_) HCurrentMethod(
Is64BitInstructionSet(instruction_set_) ? Primitive::kPrimLong : Primitive::kPrimInt);
if (entry_block_->GetFirstInstruction() == nullptr) {
diff --git a/compiler/optimizing/nodes.h b/compiler/optimizing/nodes.h
index 7ef69559de..9443653db7 100644
--- a/compiler/optimizing/nodes.h
+++ b/compiler/optimizing/nodes.h
@@ -335,6 +335,7 @@ class HGraph : public ArenaObject<kArenaAllocMisc> {
}
// If not found or previously deleted, create and cache a new instruction.
+ // Don't bother reviving a previously deleted instruction, for simplicity.
if (constant == nullptr || constant->GetBlock() == nullptr) {
constant = new (arena_) InstructionType(value);
cache->Overwrite(value, constant);
diff --git a/runtime/oat.h b/runtime/oat.h
index 604e16171d..000ae8ed5d 100644
--- a/runtime/oat.h
+++ b/runtime/oat.h
@@ -32,7 +32,7 @@ class InstructionSetFeatures;
class PACKED(4) OatHeader {
public:
static constexpr uint8_t kOatMagic[] = { 'o', 'a', 't', '\n' };
- static constexpr uint8_t kOatVersion[] = { '0', '6', '3', '\0' };
+ static constexpr uint8_t kOatVersion[] = { '0', '6', '4', '\0' };
static constexpr const char* kImageLocationKey = "image-location";
static constexpr const char* kDex2OatCmdLineKey = "dex2oat-cmdline";
diff --git a/test/Android.run-test.mk b/test/Android.run-test.mk
index 469df1f2b6..c2380cc668 100644
--- a/test/Android.run-test.mk
+++ b/test/Android.run-test.mk
@@ -377,8 +377,7 @@ TEST_ART_BROKEN_JIT_RUN_TESTS :=
# Known broken tests for the default compiler (Quick).
TEST_ART_BROKEN_DEFAULT_RUN_TESTS := \
- 457-regs \
- 496-checker-inlining-and-class-loader
+ 457-regs
ifneq (,$(filter default,$(COMPILER_TYPES)))
ART_TEST_KNOWN_BROKEN += $(call all-run-test-names,$(TARGET_TYPES),$(RUN_TYPES),$(PREBUILD_TYPES), \
generated by cgit v1.2.3-59-g8ed1b (git 2.39.0) at 2026-01-06 13:08:23 +0000