Rewrite class initialization check elimination.
Split the notion of type being in dex cache away from the
class being initialized. Include static invokes in the class
initialization elimination pass.
Change-Id: Ie3760d8fd55b987f9507f32ef51456a57d79e3fb
diff --git a/compiler/dex/compiler_enums.h b/compiler/dex/compiler_enums.h
index beeb3ad..0b76999 100644
--- a/compiler/dex/compiler_enums.h
+++ b/compiler/dex/compiler_enums.h
@@ -313,7 +313,8 @@
kMIRNullCheckOnly,
kMIRIgnoreRangeCheck,
kMIRRangeCheckOnly,
- kMIRIgnoreClInitCheck,
+ kMIRClassIsInitialized,
+ kMIRClassIsInDexCache,
kMirIgnoreDivZeroCheck,
kMIRInlined, // Invoke is inlined (ie dead).
kMIRInlinedPred, // Invoke is inlined via prediction.
diff --git a/compiler/dex/global_value_numbering_test.cc b/compiler/dex/global_value_numbering_test.cc
index d1bca29..35d5b99 100644
--- a/compiler/dex/global_value_numbering_test.cc
+++ b/compiler/dex/global_value_numbering_test.cc
@@ -161,7 +161,8 @@
MirSFieldLoweringInfo field_info(def->field_idx);
// Mark even unresolved fields as initialized.
field_info.flags_ = MirSFieldLoweringInfo::kFlagIsStatic |
- MirSFieldLoweringInfo::kFlagIsInitialized;
+ MirSFieldLoweringInfo::kFlagClassIsInitialized;
+ // NOTE: MirSFieldLoweringInfo::kFlagClassIsInDexCache isn't used by GVN.
if (def->declaring_dex_file != 0u) {
field_info.declaring_dex_file_ = reinterpret_cast<const DexFile*>(def->declaring_dex_file);
field_info.declaring_field_idx_ = def->declaring_field_idx;
diff --git a/compiler/dex/local_value_numbering.cc b/compiler/dex/local_value_numbering.cc
index 5456f4d..a171d7c 100644
--- a/compiler/dex/local_value_numbering.cc
+++ b/compiler/dex/local_value_numbering.cc
@@ -1314,7 +1314,8 @@
uint16_t LocalValueNumbering::HandleSGet(MIR* mir, uint16_t opcode) {
const MirSFieldLoweringInfo& field_info = gvn_->GetMirGraph()->GetSFieldLoweringInfo(mir);
if (!field_info.IsResolved() || field_info.IsVolatile() ||
- (!field_info.IsInitialized() && (mir->optimization_flags & MIR_IGNORE_CLINIT_CHECK) == 0)) {
+ (!field_info.IsClassInitialized() &&
+ (mir->optimization_flags & MIR_CLASS_IS_INITIALIZED) == 0)) {
// Volatile SGETs (and unresolved fields are potentially volatile) have acquire semantics
// and class initialization can call arbitrary functions, we need to wipe aliasing values.
HandleInvokeOrClInitOrAcquireOp(mir);
@@ -1350,7 +1351,8 @@
void LocalValueNumbering::HandleSPut(MIR* mir, uint16_t opcode) {
const MirSFieldLoweringInfo& field_info = gvn_->GetMirGraph()->GetSFieldLoweringInfo(mir);
- if (!field_info.IsInitialized() && (mir->optimization_flags & MIR_IGNORE_CLINIT_CHECK) == 0) {
+ if (!field_info.IsClassInitialized() &&
+ (mir->optimization_flags & MIR_CLASS_IS_INITIALIZED) == 0) {
// Class initialization can call arbitrary functions, we need to wipe aliasing values.
HandleInvokeOrClInitOrAcquireOp(mir);
}
diff --git a/compiler/dex/local_value_numbering_test.cc b/compiler/dex/local_value_numbering_test.cc
index 33d6c14..824c323 100644
--- a/compiler/dex/local_value_numbering_test.cc
+++ b/compiler/dex/local_value_numbering_test.cc
@@ -114,7 +114,8 @@
MirSFieldLoweringInfo field_info(def->field_idx);
// Mark even unresolved fields as initialized.
field_info.flags_ = MirSFieldLoweringInfo::kFlagIsStatic |
- MirSFieldLoweringInfo::kFlagIsInitialized;
+ MirSFieldLoweringInfo::kFlagClassIsInitialized;
+ // NOTE: MirSFieldLoweringInfo::kFlagClassIsInDexCache isn't used by LVN.
if (def->declaring_dex_file != 0u) {
field_info.declaring_dex_file_ = reinterpret_cast<const DexFile*>(def->declaring_dex_file);
field_info.declaring_field_idx_ = def->declaring_field_idx;
@@ -172,7 +173,7 @@
void MakeSFieldUninitialized(uint32_t sfield_index) {
CHECK_LT(sfield_index, cu_.mir_graph->sfield_lowering_infos_.size());
cu_.mir_graph->sfield_lowering_infos_[sfield_index].flags_ &=
- ~MirSFieldLoweringInfo::kFlagIsInitialized;
+ ~MirSFieldLoweringInfo::kFlagClassIsInitialized;
}
void PerformLVN() {
diff --git a/compiler/dex/mir_dataflow.cc b/compiler/dex/mir_dataflow.cc
index 0a6924c..e6a8cea 100644
--- a/compiler/dex/mir_dataflow.cc
+++ b/compiler/dex/mir_dataflow.cc
@@ -319,46 +319,46 @@
DF_UA | DF_UB | DF_NULL_CHK_B | DF_REF_B | DF_IFIELD | DF_LVN,
// 60 SGET vAA, field@BBBB
- DF_DA | DF_SFIELD | DF_UMS,
+ DF_DA | DF_SFIELD | DF_CLINIT | DF_UMS,
// 61 SGET_WIDE vAA, field@BBBB
- DF_DA | DF_A_WIDE | DF_SFIELD | DF_UMS,
+ DF_DA | DF_A_WIDE | DF_SFIELD | DF_CLINIT | DF_UMS,
// 62 SGET_OBJECT vAA, field@BBBB
- DF_DA | DF_REF_A | DF_SFIELD | DF_UMS,
+ DF_DA | DF_REF_A | DF_SFIELD | DF_CLINIT | DF_UMS,
// 63 SGET_BOOLEAN vAA, field@BBBB
- DF_DA | DF_SFIELD | DF_UMS,
+ DF_DA | DF_SFIELD | DF_CLINIT | DF_UMS,
// 64 SGET_BYTE vAA, field@BBBB
- DF_DA | DF_SFIELD | DF_UMS,
+ DF_DA | DF_SFIELD | DF_CLINIT | DF_UMS,
// 65 SGET_CHAR vAA, field@BBBB
- DF_DA | DF_SFIELD | DF_UMS,
+ DF_DA | DF_SFIELD | DF_CLINIT | DF_UMS,
// 66 SGET_SHORT vAA, field@BBBB
- DF_DA | DF_SFIELD | DF_UMS,
+ DF_DA | DF_SFIELD | DF_CLINIT | DF_UMS,
// 67 SPUT vAA, field@BBBB
- DF_UA | DF_SFIELD | DF_UMS,
+ DF_UA | DF_SFIELD | DF_CLINIT | DF_UMS,
// 68 SPUT_WIDE vAA, field@BBBB
- DF_UA | DF_A_WIDE | DF_SFIELD | DF_UMS,
+ DF_UA | DF_A_WIDE | DF_SFIELD | DF_CLINIT | DF_UMS,
// 69 SPUT_OBJECT vAA, field@BBBB
- DF_UA | DF_REF_A | DF_SFIELD | DF_UMS,
+ DF_UA | DF_REF_A | DF_SFIELD | DF_CLINIT | DF_UMS,
// 6A SPUT_BOOLEAN vAA, field@BBBB
- DF_UA | DF_SFIELD | DF_UMS,
+ DF_UA | DF_SFIELD | DF_CLINIT | DF_UMS,
// 6B SPUT_BYTE vAA, field@BBBB
- DF_UA | DF_SFIELD | DF_UMS,
+ DF_UA | DF_SFIELD | DF_CLINIT | DF_UMS,
// 6C SPUT_CHAR vAA, field@BBBB
- DF_UA | DF_SFIELD | DF_UMS,
+ DF_UA | DF_SFIELD | DF_CLINIT | DF_UMS,
// 6D SPUT_SHORT vAA, field@BBBB
- DF_UA | DF_SFIELD | DF_UMS,
+ DF_UA | DF_SFIELD | DF_CLINIT | DF_UMS,
// 6E INVOKE_VIRTUAL {vD, vE, vF, vG, vA}
DF_FORMAT_35C | DF_NULL_CHK_OUT0 | DF_UMS,
@@ -370,7 +370,7 @@
DF_FORMAT_35C | DF_NULL_CHK_OUT0 | DF_UMS,
// 71 INVOKE_STATIC {vD, vE, vF, vG, vA}
- DF_FORMAT_35C | DF_UMS,
+ DF_FORMAT_35C | DF_CLINIT | DF_UMS,
// 72 INVOKE_INTERFACE {vD, vE, vF, vG, vA}
DF_FORMAT_35C | DF_NULL_CHK_OUT0 | DF_UMS,
@@ -388,7 +388,7 @@
DF_FORMAT_3RC | DF_NULL_CHK_OUT0 | DF_UMS,
// 77 INVOKE_STATIC_RANGE {vCCCC .. vNNNN}
- DF_FORMAT_3RC | DF_UMS,
+ DF_FORMAT_3RC | DF_CLINIT | DF_UMS,
// 78 INVOKE_INTERFACE_RANGE {vCCCC .. vNNNN}
DF_FORMAT_3RC | DF_NULL_CHK_OUT0 | DF_UMS,
@@ -718,10 +718,10 @@
DF_UA | DF_UB | DF_NULL_CHK_B | DF_REF_B | DF_IFIELD | DF_LVN,
// E5 SGET_VOLATILE
- DF_DA | DF_SFIELD | DF_UMS,
+ DF_DA | DF_SFIELD | DF_CLINIT | DF_UMS,
// E6 SPUT_VOLATILE
- DF_UA | DF_SFIELD | DF_UMS,
+ DF_UA | DF_SFIELD | DF_CLINIT | DF_UMS,
// E7 IGET_OBJECT_VOLATILE
DF_DA | DF_UB | DF_NULL_CHK_B | DF_REF_A | DF_REF_B | DF_IFIELD | DF_LVN,
@@ -733,10 +733,10 @@
DF_UA | DF_A_WIDE | DF_UB | DF_NULL_CHK_B | DF_REF_B | DF_IFIELD | DF_LVN,
// EA SGET_WIDE_VOLATILE
- DF_DA | DF_A_WIDE | DF_SFIELD | DF_UMS,
+ DF_DA | DF_A_WIDE | DF_SFIELD | DF_CLINIT | DF_UMS,
// EB SPUT_WIDE_VOLATILE
- DF_UA | DF_A_WIDE | DF_SFIELD | DF_UMS,
+ DF_UA | DF_A_WIDE | DF_SFIELD | DF_CLINIT | DF_UMS,
// EC BREAKPOINT
DF_NOP,
@@ -790,10 +790,10 @@
DF_UA | DF_UB | DF_NULL_CHK_B | DF_REF_A | DF_REF_B | DF_IFIELD | DF_LVN,
// FD SGET_OBJECT_VOLATILE
- DF_DA | DF_REF_A | DF_SFIELD | DF_UMS,
+ DF_DA | DF_REF_A | DF_SFIELD | DF_CLINIT | DF_UMS,
// FE SPUT_OBJECT_VOLATILE
- DF_UA | DF_REF_A | DF_SFIELD | DF_UMS,
+ DF_UA | DF_REF_A | DF_SFIELD | DF_CLINIT | DF_UMS,
// FF UNUSED_FF
DF_NOP,
diff --git a/compiler/dex/mir_field_info.cc b/compiler/dex/mir_field_info.cc
index 68247b7..1db3b5b 100644
--- a/compiler/dex/mir_field_info.cc
+++ b/compiler/dex/mir_field_info.cc
@@ -62,7 +62,7 @@
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_ = resolved_field->GetOffset();
+ 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.
@@ -94,7 +94,7 @@
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(
+ 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.
@@ -110,16 +110,27 @@
&it->declaring_dex_file_, &it->declaring_class_idx_, &it->declaring_field_idx_);
bool is_volatile = compiler_driver->IsFieldVolatile(resolved_field) ? 1u : 0u;
- bool is_referrers_class, is_initialized;
+ mirror::Class* referrer_class = referrer_class_handle.Get();
std::pair<bool, bool> fast_path = compiler_driver->IsFastStaticField(
- dex_cache.Get(), referrer_class.Get(), resolved_field, field_idx, &it->field_offset_,
- &it->storage_index_, &is_referrers_class, &is_initialized);
- it->flags_ = kFlagIsStatic |
+ dex_cache.Get(), referrer_class, resolved_field, field_idx, &it->storage_index_);
+ uint16_t flags = kFlagIsStatic |
(is_volatile ? kFlagIsVolatile : 0u) |
(fast_path.first ? kFlagFastGet : 0u) |
- (fast_path.second ? kFlagFastPut : 0u) |
- (is_referrers_class ? kFlagIsReferrersClass : 0u) |
- (is_initialized ? kFlagIsInitialized : 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;
}
}
diff --git a/compiler/dex/mir_field_info.h b/compiler/dex/mir_field_info.h
index 1842a16..c628182 100644
--- a/compiler/dex/mir_field_info.h
+++ b/compiler/dex/mir_field_info.h
@@ -173,8 +173,12 @@
return (flags_ & kFlagIsReferrersClass) != 0u;
}
- bool IsInitialized() const {
- return (flags_ & kFlagIsInitialized) != 0u;
+ bool IsClassInitialized() const {
+ return (flags_ & kFlagClassIsInitialized) != 0u;
+ }
+
+ bool IsClassInDexCache() const {
+ return (flags_ & kFlagClassIsInDexCache) != 0u;
}
MemberOffset FieldOffset() const {
@@ -190,14 +194,16 @@
kBitFastGet = kFieldInfoBitEnd,
kBitFastPut,
kBitIsReferrersClass,
- kBitIsInitialized,
+ kBitClassIsInitialized,
+ kBitClassIsInDexCache,
kSFieldLoweringInfoBitEnd
};
COMPILE_ASSERT(kSFieldLoweringInfoBitEnd <= 16, too_many_flags);
static constexpr uint16_t kFlagFastGet = 1u << kBitFastGet;
static constexpr uint16_t kFlagFastPut = 1u << kBitFastPut;
static constexpr uint16_t kFlagIsReferrersClass = 1u << kBitIsReferrersClass;
- static constexpr uint16_t kFlagIsInitialized = 1u << kBitIsInitialized;
+ static constexpr uint16_t kFlagClassIsInitialized = 1u << kBitClassIsInitialized;
+ static constexpr uint16_t kFlagClassIsInDexCache = 1u << kBitClassIsInDexCache;
// The member offset of the field, 0u if unresolved.
MemberOffset field_offset_;
diff --git a/compiler/dex/mir_graph.cc b/compiler/dex/mir_graph.cc
index 3fa80b9..e0f471e 100644
--- a/compiler/dex/mir_graph.cc
+++ b/compiler/dex/mir_graph.cc
@@ -934,7 +934,7 @@
bb->first_mir_insn ? " | " : " ");
for (mir = bb->first_mir_insn; mir; mir = mir->next) {
int opcode = mir->dalvikInsn.opcode;
- fprintf(file, " {%04x %s %s %s %s %s %s %s\\l}%s\\\n", mir->offset,
+ fprintf(file, " {%04x %s %s %s %s %s %s %s %s\\l}%s\\\n", mir->offset,
mir->ssa_rep ? GetDalvikDisassembly(mir) :
!MIR::DecodedInstruction::IsPseudoMirOp(opcode) ?
Instruction::Name(mir->dalvikInsn.opcode) :
@@ -944,7 +944,8 @@
(mir->optimization_flags & MIR_IGNORE_SUSPEND_CHECK) != 0 ? " no_suspendcheck" : " ",
(mir->optimization_flags & MIR_STORE_NON_TEMPORAL) != 0 ? " non_temporal" : " ",
(mir->optimization_flags & MIR_CALLEE) != 0 ? " inlined" : " ",
- (mir->optimization_flags & MIR_IGNORE_CLINIT_CHECK) != 0 ? " no_clinit" : " ",
+ (mir->optimization_flags & MIR_CLASS_IS_INITIALIZED) != 0 ? " cl_inited" : " ",
+ (mir->optimization_flags & MIR_CLASS_IS_IN_DEX_CACHE) != 0 ? " cl_in_cache" : " ",
mir->next ? " | " : " ");
}
fprintf(file, " }\"];\n\n");
diff --git a/compiler/dex/mir_graph.h b/compiler/dex/mir_graph.h
index 5c74e9e..fd4c473 100644
--- a/compiler/dex/mir_graph.h
+++ b/compiler/dex/mir_graph.h
@@ -69,6 +69,7 @@
kUsesMethodStar, // Implicit use of Method*.
kUsesIField, // Accesses an instance field (IGET/IPUT).
kUsesSField, // Accesses a static field (SGET/SPUT).
+ kCanInitializeClass, // Can trigger class initialization (SGET/SPUT/INVOKE_STATIC).
kDoLVN, // Worth computing local value numbers.
};
@@ -105,6 +106,7 @@
#define DF_UMS (UINT64_C(1) << kUsesMethodStar)
#define DF_IFIELD (UINT64_C(1) << kUsesIField)
#define DF_SFIELD (UINT64_C(1) << kUsesSField)
+#define DF_CLINIT (UINT64_C(1) << kCanInitializeClass)
#define DF_LVN (UINT64_C(1) << kDoLVN)
#define DF_HAS_USES (DF_UA | DF_UB | DF_UC)
@@ -146,7 +148,8 @@
#define MIR_NULL_CHECK_ONLY (1 << kMIRNullCheckOnly)
#define MIR_IGNORE_RANGE_CHECK (1 << kMIRIgnoreRangeCheck)
#define MIR_RANGE_CHECK_ONLY (1 << kMIRRangeCheckOnly)
-#define MIR_IGNORE_CLINIT_CHECK (1 << kMIRIgnoreClInitCheck)
+#define MIR_CLASS_IS_INITIALIZED (1 << kMIRClassIsInitialized)
+#define MIR_CLASS_IS_IN_DEX_CACHE (1 << kMIRClassIsInDexCache)
#define MIR_IGNORE_DIV_ZERO_CHECK (1 << kMirIgnoreDivZeroCheck)
#define MIR_INLINED (1 << kMIRInlined)
#define MIR_INLINED_PRED (1 << kMIRInlinedPred)
diff --git a/compiler/dex/mir_method_info.cc b/compiler/dex/mir_method_info.cc
index cc2bd95..b234950 100644
--- a/compiler/dex/mir_method_info.cc
+++ b/compiler/dex/mir_method_info.cc
@@ -76,14 +76,16 @@
int fast_path_flags = compiler_driver->IsFastInvoke(
soa, dex_cache, class_loader, mUnit, referrer_class.Get(), resolved_method, &invoke_type,
&target_method, devirt_target, &it->direct_code_, &it->direct_method_);
- bool needs_clinit =
- compiler_driver->NeedsClassInitialization(referrer_class.Get(), resolved_method);
+ bool is_referrers_class = (referrer_class.Get() == resolved_method->GetDeclaringClass());
+ bool is_class_initialized =
+ compiler_driver->IsMethodsClassInitialized(referrer_class.Get(), resolved_method);
uint16_t other_flags = it->flags_ &
- ~(kFlagFastPath | kFlagNeedsClassInitialization | (kInvokeTypeMask << kBitSharpTypeBegin));
+ ~(kFlagFastPath | kFlagClassIsInitialized | (kInvokeTypeMask << kBitSharpTypeBegin));
it->flags_ = other_flags |
(fast_path_flags != 0 ? kFlagFastPath : 0u) |
(static_cast<uint16_t>(invoke_type) << kBitSharpTypeBegin) |
- (needs_clinit ? kFlagNeedsClassInitialization : 0u);
+ (is_referrers_class ? kFlagIsReferrersClass : 0u) |
+ (is_class_initialized ? kFlagClassIsInitialized : 0u);
it->target_dex_file_ = target_method.dex_file;
it->target_method_idx_ = target_method.dex_method_index;
it->stats_flags_ = fast_path_flags;
diff --git a/compiler/dex/mir_method_info.h b/compiler/dex/mir_method_info.h
index efe92f3..e64b028 100644
--- a/compiler/dex/mir_method_info.h
+++ b/compiler/dex/mir_method_info.h
@@ -123,8 +123,12 @@
return (flags_ & kFlagFastPath) != 0u;
}
- bool NeedsClassInitialization() const {
- return (flags_ & kFlagNeedsClassInitialization) != 0u;
+ bool IsReferrersClass() const {
+ return (flags_ & kFlagIsReferrersClass) != 0;
+ }
+
+ bool IsClassInitialized() const {
+ return (flags_ & kFlagClassIsInitialized) != 0u;
}
InvokeType GetInvokeType() const {
@@ -162,12 +166,14 @@
kBitInvokeTypeEnd = kBitInvokeTypeBegin + 3, // 3 bits for invoke type.
kBitSharpTypeBegin,
kBitSharpTypeEnd = kBitSharpTypeBegin + 3, // 3 bits for sharp type.
- kBitNeedsClassInitialization = kBitSharpTypeEnd,
- kMethodLoweringInfoEnd
+ kBitIsReferrersClass = kBitSharpTypeEnd,
+ kBitClassIsInitialized,
+ kMethodLoweringInfoBitEnd
};
- COMPILE_ASSERT(kMethodLoweringInfoEnd <= 16, too_many_flags);
+ COMPILE_ASSERT(kMethodLoweringInfoBitEnd <= 16, too_many_flags);
static constexpr uint16_t kFlagFastPath = 1u << kBitFastPath;
- static constexpr uint16_t kFlagNeedsClassInitialization = 1u << kBitNeedsClassInitialization;
+ static constexpr uint16_t kFlagIsReferrersClass = 1u << kBitIsReferrersClass;
+ static constexpr uint16_t kFlagClassIsInitialized = 1u << kBitClassIsInitialized;
static constexpr uint16_t kInvokeTypeMask = 7u;
COMPILE_ASSERT((1u << (kBitInvokeTypeEnd - kBitInvokeTypeBegin)) - 1u == kInvokeTypeMask,
assert_invoke_type_bits_ok);
@@ -185,7 +191,7 @@
uint16_t vtable_idx_;
int stats_flags_;
- friend class ClassInitCheckEliminationTest;
+ friend class MirOptimizationTest;
};
} // namespace art
diff --git a/compiler/dex/mir_optimization.cc b/compiler/dex/mir_optimization.cc
index 96505ab..8e583cc 100644
--- a/compiler/dex/mir_optimization.cc
+++ b/compiler/dex/mir_optimization.cc
@@ -778,8 +778,8 @@
const MirSFieldLoweringInfo& field_info = GetSFieldLoweringInfo(throw_insn);
bool fast = ((df_attributes & DF_DA) ? field_info.FastPut() : field_info.FastGet());
// Don't combine if the SGET/SPUT can call <clinit>().
- bool clinit = !field_info.IsInitialized() &&
- (throw_insn->optimization_flags & MIR_IGNORE_CLINIT_CHECK) == 0;
+ bool clinit = !field_info.IsClassInitialized() &&
+ (throw_insn->optimization_flags & MIR_CLASS_IS_INITIALIZED) == 0;
ok = fast && !clinit;
} else if ((df_attributes & DF_HAS_RANGE_CHKS) != 0) {
// Only AGET/APUT have range checks. We have processed the AGET/APUT null check above.
@@ -1116,7 +1116,7 @@
bool MIRGraph::EliminateClassInitChecksGate() {
if ((cu_->disable_opt & (1 << kClassInitCheckElimination)) != 0 ||
- !cu_->mir_graph->HasStaticFieldAccess()) {
+ (merged_df_flags_ & DF_CLINIT) == 0) {
return false;
}
@@ -1127,6 +1127,7 @@
const size_t end = (GetNumDalvikInsns() + 1u) / 2u;
temp_insn_data_ = static_cast<uint16_t*>(
temp_scoped_alloc_->Alloc(end * sizeof(*temp_insn_data_), kArenaAllocGrowableArray));
+ std::fill_n(temp_insn_data_, end, 0xffffu);
uint32_t unique_class_count = 0u;
{
@@ -1162,8 +1163,7 @@
if (mir->dalvikInsn.opcode >= Instruction::SGET &&
mir->dalvikInsn.opcode <= Instruction::SPUT_SHORT) {
const MirSFieldLoweringInfo& field_info = GetSFieldLoweringInfo(mir);
- uint16_t index = 0xffffu;
- if (!field_info.IsInitialized()) {
+ if (!field_info.IsReferrersClass()) {
DCHECK_LT(class_to_index_map.size(), 0xffffu);
MapEntry entry = {
// Treat unresolved fields as if each had its own class.
@@ -1173,10 +1173,24 @@
: field_info.FieldIndex(),
static_cast<uint16_t>(class_to_index_map.size())
};
- index = class_to_index_map.insert(entry).first->index;
+ uint16_t index = class_to_index_map.insert(entry).first->index;
+ // Using offset/2 for index into temp_insn_data_.
+ temp_insn_data_[mir->offset / 2u] = index;
}
- // Using offset/2 for index into temp_insn_data_.
- temp_insn_data_[mir->offset / 2u] = index;
+ } else if (mir->dalvikInsn.opcode == Instruction::INVOKE_STATIC ||
+ mir->dalvikInsn.opcode == Instruction::INVOKE_STATIC_RANGE) {
+ const MirMethodLoweringInfo& method_info = GetMethodLoweringInfo(mir);
+ DCHECK(method_info.IsStatic());
+ if (method_info.FastPath() && !method_info.IsReferrersClass()) {
+ MapEntry entry = {
+ method_info.DeclaringDexFile(),
+ method_info.DeclaringClassIndex(),
+ static_cast<uint16_t>(class_to_index_map.size())
+ };
+ uint16_t index = class_to_index_map.insert(entry).first->index;
+ // Using offset/2 for index into temp_insn_data_.
+ temp_insn_data_[mir->offset / 2u] = index;
+ }
}
}
}
@@ -1191,7 +1205,8 @@
return false;
}
- temp_bit_vector_size_ = unique_class_count;
+ // 2 bits for each class: is class initialized, is class in dex cache.
+ temp_bit_vector_size_ = 2u * unique_class_count;
temp_bit_vector_ = new (temp_scoped_alloc_.get()) ArenaBitVector(
temp_scoped_alloc_.get(), temp_bit_vector_size_, false, kBitMapClInitCheck);
temp_bit_matrix_ = static_cast<ArenaBitVector**>(
@@ -1219,26 +1234,18 @@
DCHECK(classes_to_check != nullptr);
if (bb->block_type == kEntryBlock) {
classes_to_check->SetInitialBits(temp_bit_vector_size_);
- } else if (bb->predecessors.size() == 1) {
- BasicBlock* pred_bb = GetBasicBlock(bb->predecessors[0]);
- // pred_bb must have already been processed at least once.
- DCHECK(pred_bb != nullptr);
- DCHECK(temp_bit_matrix_[pred_bb->id] != nullptr);
- classes_to_check->Copy(temp_bit_matrix_[pred_bb->id]);
} else {
// Starting state is union of all incoming arcs.
bool copied_first = false;
for (BasicBlockId pred_id : bb->predecessors) {
- BasicBlock* pred_bb = GetBasicBlock(pred_id);
- DCHECK(pred_bb != nullptr);
- if (temp_bit_matrix_[pred_bb->id] == nullptr) {
+ if (temp_bit_matrix_[pred_id] == nullptr) {
continue;
}
if (!copied_first) {
copied_first = true;
- classes_to_check->Copy(temp_bit_matrix_[pred_bb->id]);
+ classes_to_check->Copy(temp_bit_matrix_[pred_id]);
} else {
- classes_to_check->Union(temp_bit_matrix_[pred_bb->id]);
+ classes_to_check->Union(temp_bit_matrix_[pred_id]);
}
}
DCHECK(copied_first); // At least one predecessor must have been processed before this bb.
@@ -1247,22 +1254,46 @@
// Walk through the instruction in the block, updating as necessary
for (MIR* mir = bb->first_mir_insn; mir != nullptr; mir = mir->next) {
- if (mir->dalvikInsn.opcode >= Instruction::SGET &&
- mir->dalvikInsn.opcode <= Instruction::SPUT_SHORT) {
- uint16_t index = temp_insn_data_[mir->offset / 2u];
- if (index != 0xffffu) {
- if (mir->dalvikInsn.opcode >= Instruction::SGET &&
- mir->dalvikInsn.opcode <= Instruction::SPUT_SHORT) {
- if (!classes_to_check->IsBitSet(index)) {
- // Eliminate the class init check.
- mir->optimization_flags |= MIR_IGNORE_CLINIT_CHECK;
- } else {
- // Do the class init check.
- mir->optimization_flags &= ~MIR_IGNORE_CLINIT_CHECK;
- }
+ uint16_t index = temp_insn_data_[mir->offset / 2u];
+ if (index != 0xffffu) {
+ bool check_initialization = false;
+ bool check_dex_cache = false;
+
+ // NOTE: index != 0xffff does not guarantee that this is an SGET/SPUT/INVOKE_STATIC.
+ // Dex instructions with width 1 can have the same offset/2.
+
+ if (mir->dalvikInsn.opcode >= Instruction::SGET &&
+ mir->dalvikInsn.opcode <= Instruction::SPUT_SHORT) {
+ check_initialization = true;
+ check_dex_cache = true;
+ } else if (mir->dalvikInsn.opcode == Instruction::INVOKE_STATIC ||
+ mir->dalvikInsn.opcode == Instruction::INVOKE_STATIC_RANGE) {
+ check_initialization = true;
+ // NOTE: INVOKE_STATIC doesn't guarantee that the type will be in the dex cache.
+ }
+
+ if (check_dex_cache) {
+ uint32_t check_dex_cache_index = 2u * index + 1u;
+ if (!classes_to_check->IsBitSet(check_dex_cache_index)) {
+ // Eliminate the class init check.
+ mir->optimization_flags |= MIR_CLASS_IS_IN_DEX_CACHE;
+ } else {
+ // Do the class init check.
+ mir->optimization_flags &= ~MIR_CLASS_IS_IN_DEX_CACHE;
+ }
+ classes_to_check->ClearBit(check_dex_cache_index);
+ }
+ if (check_initialization) {
+ uint32_t check_clinit_index = 2u * index;
+ if (!classes_to_check->IsBitSet(check_clinit_index)) {
+ // Eliminate the class init check.
+ mir->optimization_flags |= MIR_CLASS_IS_INITIALIZED;
+ } else {
+ // Do the class init check.
+ mir->optimization_flags &= ~MIR_CLASS_IS_INITIALIZED;
}
// Mark the class as initialized.
- classes_to_check->ClearBit(index);
+ classes_to_check->ClearBit(check_clinit_index);
}
}
}
@@ -1425,8 +1456,8 @@
}
if (sharp_type == kStatic) {
- bool needs_clinit = method_info.NeedsClassInitialization() &&
- ((mir->optimization_flags & MIR_IGNORE_CLINIT_CHECK) == 0);
+ bool needs_clinit = !method_info.IsClassInitialized() &&
+ ((mir->optimization_flags & MIR_CLASS_IS_INITIALIZED) == 0);
if (needs_clinit) {
continue;
}
diff --git a/compiler/dex/mir_optimization_test.cc b/compiler/dex/mir_optimization_test.cc
index 337d4ef..8874faf 100644
--- a/compiler/dex/mir_optimization_test.cc
+++ b/compiler/dex/mir_optimization_test.cc
@@ -36,10 +36,21 @@
BasicBlockId predecessors[kMaxPredecessors];
};
+ struct MethodDef {
+ uint16_t method_idx;
+ uintptr_t declaring_dex_file;
+ uint16_t declaring_class_idx;
+ uint16_t declaring_method_idx;
+ InvokeType invoke_type;
+ InvokeType sharp_type;
+ bool is_referrers_class;
+ bool is_initialized;
+ };
+
struct MIRDef {
BasicBlockId bbid;
Instruction::Code opcode;
- uint32_t field_info;
+ uint32_t field_or_method_info;
uint32_t vA;
uint32_t vB;
uint32_t vC;
@@ -68,6 +79,19 @@
#define DEF_BB(type, succ, pred) \
{ type, succ, pred }
+#define DEF_SGET_SPUT(bb, opcode, vA, field_info) \
+ { bb, opcode, field_info, vA, 0u, 0u }
+#define DEF_IGET_IPUT(bb, opcode, vA, vB, field_info) \
+ { bb, opcode, field_info, vA, vB, 0u }
+#define DEF_AGET_APUT(bb, opcode, vA, vB, vC) \
+ { bb, opcode, 0u, vA, vB, vC }
+#define DEF_INVOKE(bb, opcode, vC, method_info) \
+ { bb, opcode, method_info, 0u, 0u, vC }
+#define DEF_OTHER1(bb, opcode, vA) \
+ { bb, opcode, 0u, vA, 0u, 0u }
+#define DEF_OTHER2(bb, opcode, vA, vB) \
+ { bb, opcode, 0u, vA, vB, 0u }
+
void DoPrepareBasicBlocks(const BBDef* defs, size_t count) {
cu_.mir_graph->block_id_map_.clear();
cu_.mir_graph->block_list_.clear();
@@ -172,6 +196,35 @@
check_bb->successor_blocks.push_back(successor_block_info);
}
+ void DoPrepareMethods(const MethodDef* defs, size_t count) {
+ cu_.mir_graph->method_lowering_infos_.clear();
+ cu_.mir_graph->method_lowering_infos_.reserve(count);
+ for (size_t i = 0u; i != count; ++i) {
+ const MethodDef* def = &defs[i];
+ MirMethodLoweringInfo method_info(def->method_idx, def->invoke_type);
+ if (def->declaring_dex_file != 0u) {
+ method_info.declaring_dex_file_ = reinterpret_cast<const DexFile*>(def->declaring_dex_file);
+ method_info.declaring_class_idx_ = def->declaring_class_idx;
+ method_info.declaring_method_idx_ = def->declaring_method_idx;
+ }
+ ASSERT_EQ(def->invoke_type != kStatic, def->sharp_type != kStatic);
+ method_info.flags_ =
+ ((def->invoke_type == kStatic) ? MirMethodLoweringInfo::kFlagIsStatic : 0u) |
+ MirMethodLoweringInfo::kFlagFastPath |
+ (static_cast<uint16_t>(def->invoke_type) << MirMethodLoweringInfo::kBitInvokeTypeBegin) |
+ (static_cast<uint16_t>(def->sharp_type) << MirMethodLoweringInfo::kBitSharpTypeBegin) |
+ ((def->is_referrers_class) ? MirMethodLoweringInfo::kFlagIsReferrersClass : 0u) |
+ ((def->is_initialized == kStatic) ? MirMethodLoweringInfo::kFlagClassIsInitialized : 0u);
+ ASSERT_EQ(def->declaring_dex_file != 0u, method_info.IsResolved());
+ cu_.mir_graph->method_lowering_infos_.push_back(method_info);
+ }
+ }
+
+ template <size_t count>
+ void PrepareMethods(const MethodDef (&defs)[count]) {
+ DoPrepareMethods(defs, count);
+ }
+
void DoPrepareMIRs(const MIRDef* defs, size_t count) {
mir_count_ = count;
mirs_ = reinterpret_cast<MIR*>(cu_.arena.Alloc(sizeof(MIR) * count, kArenaAllocMIR));
@@ -184,11 +237,16 @@
BasicBlock* bb = cu_.mir_graph->block_list_[def->bbid];
bb->AppendMIR(mir);
if (def->opcode >= Instruction::SGET && def->opcode <= Instruction::SPUT_SHORT) {
- ASSERT_LT(def->field_info, cu_.mir_graph->sfield_lowering_infos_.size());
- mir->meta.sfield_lowering_info = def->field_info;
+ ASSERT_LT(def->field_or_method_info, cu_.mir_graph->sfield_lowering_infos_.size());
+ mir->meta.sfield_lowering_info = def->field_or_method_info;
} else if (def->opcode >= Instruction::IGET && def->opcode <= Instruction::IPUT_SHORT) {
- ASSERT_LT(def->field_info, cu_.mir_graph->ifield_lowering_infos_.size());
- mir->meta.ifield_lowering_info = def->field_info;
+ ASSERT_LT(def->field_or_method_info, cu_.mir_graph->ifield_lowering_infos_.size());
+ mir->meta.ifield_lowering_info = def->field_or_method_info;
+ } else if (def->opcode >= Instruction::INVOKE_VIRTUAL &&
+ def->opcode < Instruction::INVOKE_INTERFACE_RANGE &&
+ def->opcode != Instruction::RETURN_VOID_BARRIER) {
+ ASSERT_LT(def->field_or_method_info, cu_.mir_graph->method_lowering_infos_.size());
+ mir->meta.method_lowering_info = def->field_or_method_info;
}
mir->dalvikInsn.vA = def->vA;
mir->dalvikInsn.vB = def->vB;
@@ -251,7 +309,7 @@
field_info.flags_ = MirSFieldLoweringInfo::kFlagIsStatic;
}
ASSERT_EQ(def->declaring_dex_file != 0u, field_info.IsResolved());
- ASSERT_FALSE(field_info.IsInitialized());
+ ASSERT_FALSE(field_info.IsClassInitialized());
cu_.mir_graph->sfield_lowering_infos_.push_back(field_info);
}
}
@@ -326,12 +384,13 @@
NullCheckEliminationTest()
: MirOptimizationTest() {
+ static const MethodDef methods[] = {
+ { 0u, 1u, 0u, 0u, kDirect, kDirect, false, false }, // Dummy.
+ };
+ PrepareMethods(methods);
}
};
-#define DEF_SGET_SPUT_V0(bb, opcode, field_info) \
- { bb, opcode, field_info, 0u, 0u, 0u }
-
TEST_F(ClassInitCheckEliminationTest, SingleBlock) {
static const SFieldDef sfields[] = {
{ 0u, 1u, 0u, 0u },
@@ -342,17 +401,17 @@
{ 5u, 0u, 0u, 0u }, // Unresolved.
};
static const MIRDef mirs[] = {
- DEF_SGET_SPUT_V0(3u, Instruction::SPUT, 5u), // Unresolved.
- DEF_SGET_SPUT_V0(3u, Instruction::SPUT, 0u),
- DEF_SGET_SPUT_V0(3u, Instruction::SGET, 1u),
- DEF_SGET_SPUT_V0(3u, Instruction::SGET, 2u),
- DEF_SGET_SPUT_V0(3u, Instruction::SGET, 5u), // Unresolved.
- DEF_SGET_SPUT_V0(3u, Instruction::SGET, 0u),
- DEF_SGET_SPUT_V0(3u, Instruction::SGET, 1u),
- DEF_SGET_SPUT_V0(3u, Instruction::SGET, 2u),
- DEF_SGET_SPUT_V0(3u, Instruction::SGET, 5u), // Unresolved.
- DEF_SGET_SPUT_V0(3u, Instruction::SGET, 3u),
- DEF_SGET_SPUT_V0(3u, Instruction::SGET, 4u),
+ DEF_SGET_SPUT(3u, Instruction::SPUT, 0u, 5u), // Unresolved.
+ DEF_SGET_SPUT(3u, Instruction::SPUT, 0u, 0u),
+ DEF_SGET_SPUT(3u, Instruction::SGET, 0u, 1u),
+ DEF_SGET_SPUT(3u, Instruction::SGET, 0u, 2u),
+ DEF_SGET_SPUT(3u, Instruction::SGET, 0u, 5u), // Unresolved.
+ DEF_SGET_SPUT(3u, Instruction::SGET, 0u, 0u),
+ DEF_SGET_SPUT(3u, Instruction::SGET, 0u, 1u),
+ DEF_SGET_SPUT(3u, Instruction::SGET, 0u, 2u),
+ DEF_SGET_SPUT(3u, Instruction::SGET, 0u, 5u), // Unresolved.
+ DEF_SGET_SPUT(3u, Instruction::SGET, 0u, 3u),
+ DEF_SGET_SPUT(3u, Instruction::SGET, 0u, 4u),
};
static const bool expected_ignore_clinit_check[] = {
false, false, false, false, true, true, true, true, true, false, true
@@ -365,7 +424,50 @@
ASSERT_EQ(arraysize(expected_ignore_clinit_check), mir_count_);
for (size_t i = 0u; i != arraysize(mirs); ++i) {
EXPECT_EQ(expected_ignore_clinit_check[i],
- (mirs_[i].optimization_flags & MIR_IGNORE_CLINIT_CHECK) != 0) << i;
+ (mirs_[i].optimization_flags & MIR_CLASS_IS_INITIALIZED) != 0) << i;
+ EXPECT_EQ(expected_ignore_clinit_check[i],
+ (mirs_[i].optimization_flags & MIR_CLASS_IS_IN_DEX_CACHE) != 0) << i;
+ }
+}
+
+TEST_F(ClassInitCheckEliminationTest, SingleBlockWithInvokes) {
+ static const SFieldDef sfields[] = {
+ { 0u, 1u, 0u, 0u },
+ { 1u, 1u, 1u, 1u },
+ { 2u, 1u, 2u, 2u },
+ };
+ static const MethodDef methods[] = {
+ { 0u, 1u, 0u, 0u, kStatic, kStatic, false, false },
+ { 1u, 1u, 1u, 1u, kStatic, kStatic, false, false },
+ { 2u, 1u, 2u, 2u, kStatic, kStatic, false, false },
+ };
+ static const MIRDef mirs[] = {
+ DEF_SGET_SPUT(3u, Instruction::SGET, 0u, 0u),
+ DEF_INVOKE(3u, Instruction::INVOKE_STATIC, 0u /* dummy */, 0u),
+ DEF_INVOKE(3u, Instruction::INVOKE_STATIC, 0u /* dummy */, 1u),
+ DEF_SGET_SPUT(3u, Instruction::SGET, 0u, 1u),
+ DEF_INVOKE(3u, Instruction::INVOKE_STATIC, 0u /* dummy */, 2u),
+ DEF_INVOKE(3u, Instruction::INVOKE_STATIC, 0u /* dummy */, 2u),
+ };
+ static const bool expected_class_initialized[] = {
+ false, true, false, true, false, true
+ };
+ static const bool expected_class_in_dex_cache[] = {
+ false, false, false, false, false, false
+ };
+
+ PrepareSFields(sfields);
+ PrepareMethods(methods);
+ PrepareSingleBlock();
+ PrepareMIRs(mirs);
+ PerformClassInitCheckElimination();
+ ASSERT_EQ(arraysize(expected_class_initialized), mir_count_);
+ ASSERT_EQ(arraysize(expected_class_in_dex_cache), mir_count_);
+ for (size_t i = 0u; i != arraysize(mirs); ++i) {
+ EXPECT_EQ(expected_class_initialized[i],
+ (mirs_[i].optimization_flags & MIR_CLASS_IS_INITIALIZED) != 0) << i;
+ EXPECT_EQ(expected_class_in_dex_cache[i],
+ (mirs_[i].optimization_flags & MIR_CLASS_IS_IN_DEX_CACHE) != 0) << i;
}
}
@@ -385,32 +487,32 @@
};
static const MIRDef mirs[] = {
// NOTE: MIRs here are ordered by unique tests. They will be put into appropriate blocks.
- DEF_SGET_SPUT_V0(3u, Instruction::SGET, 10u), // Unresolved.
- DEF_SGET_SPUT_V0(3u, Instruction::SPUT, 10u), // Unresolved.
- DEF_SGET_SPUT_V0(3u, Instruction::SPUT, 0u),
- DEF_SGET_SPUT_V0(6u, Instruction::SGET, 0u), // Eliminated (BB #3 dominates #6).
- DEF_SGET_SPUT_V0(4u, Instruction::SPUT, 1u),
- DEF_SGET_SPUT_V0(6u, Instruction::SGET, 1u), // Not eliminated (BB #4 doesn't dominate #6).
- DEF_SGET_SPUT_V0(3u, Instruction::SGET, 2u),
- DEF_SGET_SPUT_V0(4u, Instruction::SGET, 2u), // Eliminated (BB #3 dominates #4).
- DEF_SGET_SPUT_V0(3u, Instruction::SGET, 3u),
- DEF_SGET_SPUT_V0(5u, Instruction::SGET, 3u), // Eliminated (BB #3 dominates #5).
- DEF_SGET_SPUT_V0(3u, Instruction::SGET, 4u),
- DEF_SGET_SPUT_V0(6u, Instruction::SGET, 4u), // Eliminated (BB #3 dominates #6).
- DEF_SGET_SPUT_V0(4u, Instruction::SGET, 5u),
- DEF_SGET_SPUT_V0(6u, Instruction::SGET, 5u), // Not eliminated (BB #4 doesn't dominate #6).
- DEF_SGET_SPUT_V0(5u, Instruction::SGET, 6u),
- DEF_SGET_SPUT_V0(6u, Instruction::SGET, 6u), // Not eliminated (BB #5 doesn't dominate #6).
- DEF_SGET_SPUT_V0(4u, Instruction::SGET, 7u),
- DEF_SGET_SPUT_V0(5u, Instruction::SGET, 7u),
- DEF_SGET_SPUT_V0(6u, Instruction::SGET, 7u), // Eliminated (initialized in both #3 and #4).
- DEF_SGET_SPUT_V0(4u, Instruction::SGET, 8u),
- DEF_SGET_SPUT_V0(5u, Instruction::SGET, 9u),
- DEF_SGET_SPUT_V0(6u, Instruction::SGET, 8u), // Eliminated (with sfield[9] in BB #5).
- DEF_SGET_SPUT_V0(6u, Instruction::SPUT, 9u), // Eliminated (with sfield[8] in BB #4).
+ DEF_SGET_SPUT(3u, Instruction::SGET, 0u, 10u), // Unresolved.
+ DEF_SGET_SPUT(3u, Instruction::SPUT, 0u, 10u), // Unresolved.
+ DEF_SGET_SPUT(3u, Instruction::SPUT, 0u, 0u),
+ DEF_SGET_SPUT(6u, Instruction::SGET, 0u, 0u), // Eliminated (BB #3 dominates #6).
+ DEF_SGET_SPUT(4u, Instruction::SPUT, 0u, 1u),
+ DEF_SGET_SPUT(6u, Instruction::SGET, 0u, 1u), // Not eliminated (BB #4 doesn't dominate #6).
+ DEF_SGET_SPUT(3u, Instruction::SGET, 0u, 2u),
+ DEF_SGET_SPUT(4u, Instruction::SGET, 0u, 2u), // Eliminated (BB #3 dominates #4).
+ DEF_SGET_SPUT(3u, Instruction::SGET, 0u, 3u),
+ DEF_SGET_SPUT(5u, Instruction::SGET, 0u, 3u), // Eliminated (BB #3 dominates #5).
+ DEF_SGET_SPUT(3u, Instruction::SGET, 0u, 4u),
+ DEF_SGET_SPUT(6u, Instruction::SGET, 0u, 4u), // Eliminated (BB #3 dominates #6).
+ DEF_SGET_SPUT(4u, Instruction::SGET, 0u, 5u),
+ DEF_SGET_SPUT(6u, Instruction::SGET, 0u, 5u), // Not eliminated (BB #4 doesn't dominate #6).
+ DEF_SGET_SPUT(5u, Instruction::SGET, 0u, 6u),
+ DEF_SGET_SPUT(6u, Instruction::SGET, 0u, 6u), // Not eliminated (BB #5 doesn't dominate #6).
+ DEF_SGET_SPUT(4u, Instruction::SGET, 0u, 7u),
+ DEF_SGET_SPUT(5u, Instruction::SGET, 0u, 7u),
+ DEF_SGET_SPUT(6u, Instruction::SGET, 0u, 7u), // Eliminated (initialized in both #3 and #4).
+ DEF_SGET_SPUT(4u, Instruction::SGET, 0u, 8u),
+ DEF_SGET_SPUT(5u, Instruction::SGET, 0u, 9u),
+ DEF_SGET_SPUT(6u, Instruction::SGET, 0u, 8u), // Eliminated (with sfield[9] in BB #5).
+ DEF_SGET_SPUT(6u, Instruction::SPUT, 0u, 9u), // Eliminated (with sfield[8] in BB #4).
};
static const bool expected_ignore_clinit_check[] = {
- false, true, // Unresolved: sfield[10], method[2]
+ false, true, // Unresolved: sfield[10]
false, true, // sfield[0]
false, false, // sfield[1]
false, true, // sfield[2]
@@ -429,7 +531,70 @@
ASSERT_EQ(arraysize(expected_ignore_clinit_check), mir_count_);
for (size_t i = 0u; i != arraysize(mirs); ++i) {
EXPECT_EQ(expected_ignore_clinit_check[i],
- (mirs_[i].optimization_flags & MIR_IGNORE_CLINIT_CHECK) != 0) << i;
+ (mirs_[i].optimization_flags & MIR_CLASS_IS_INITIALIZED) != 0) << i;
+ EXPECT_EQ(expected_ignore_clinit_check[i],
+ (mirs_[i].optimization_flags & MIR_CLASS_IS_IN_DEX_CACHE) != 0) << i;
+ }
+}
+
+TEST_F(ClassInitCheckEliminationTest, DiamondWithInvokes) {
+ static const SFieldDef sfields[] = {
+ { 0u, 1u, 0u, 0u },
+ { 1u, 1u, 1u, 1u },
+ { 2u, 1u, 2u, 2u },
+ { 3u, 1u, 3u, 3u },
+ { 4u, 1u, 4u, 4u },
+ };
+ static const MethodDef methods[] = {
+ { 0u, 1u, 0u, 0u, kStatic, kStatic, false, false },
+ { 1u, 1u, 1u, 1u, kStatic, kStatic, false, false },
+ { 2u, 1u, 2u, 2u, kStatic, kStatic, false, false },
+ { 3u, 1u, 3u, 3u, kStatic, kStatic, false, false },
+ { 4u, 1u, 4u, 4u, kStatic, kStatic, false, false },
+ };
+ static const MIRDef mirs[] = {
+ // NOTE: MIRs here are ordered by unique tests. They will be put into appropriate blocks.
+ DEF_SGET_SPUT(3u, Instruction::SPUT, 0u, 0u),
+ DEF_INVOKE(6u, Instruction::INVOKE_STATIC, 0u /* dummy */, 0u),
+ DEF_INVOKE(3u, Instruction::INVOKE_STATIC, 0u /* dummy */, 1u),
+ DEF_SGET_SPUT(6u, Instruction::SPUT, 0u, 1u),
+ DEF_SGET_SPUT(4u, Instruction::SGET, 0u, 2u),
+ DEF_INVOKE(5u, Instruction::INVOKE_STATIC, 0u /* dummy */, 2u),
+ DEF_SGET_SPUT(6u, Instruction::SPUT, 0u, 2u),
+ DEF_INVOKE(4u, Instruction::INVOKE_STATIC, 0u /* dummy */, 3u),
+ DEF_SGET_SPUT(5u, Instruction::SPUT, 0u, 3u),
+ DEF_SGET_SPUT(6u, Instruction::SGET, 0u, 3u),
+ DEF_SGET_SPUT(4u, Instruction::SPUT, 0u, 4u),
+ DEF_SGET_SPUT(5u, Instruction::SGET, 0u, 4u),
+ DEF_INVOKE(6u, Instruction::INVOKE_STATIC, 0u /* dummy */, 4u),
+ };
+ static const bool expected_class_initialized[] = {
+ false, true, // BB #3 SPUT, BB#6 INVOKE_STATIC
+ false, true, // BB #3 INVOKE_STATIC, BB#6 SPUT
+ false, false, true, // BB #4 SGET, BB #5 INVOKE_STATIC, BB #6 SPUT
+ false, false, true, // BB #4 INVOKE_STATIC, BB #5 SPUT, BB #6 SGET
+ false, false, true, // BB #4 SPUT, BB #5 SGET, BB #6 INVOKE_STATIC
+ };
+ static const bool expected_class_in_dex_cache[] = {
+ false, false, // BB #3 SPUT, BB#6 INVOKE_STATIC
+ false, false, // BB #3 INVOKE_STATIC, BB#6 SPUT
+ false, false, false, // BB #4 SGET, BB #5 INVOKE_STATIC, BB #6 SPUT
+ false, false, false, // BB #4 INVOKE_STATIC, BB #5 SPUT, BB #6 SGET
+ false, false, false, // BB #4 SPUT, BB #5 SGET, BB #6 INVOKE_STATIC
+ };
+
+ PrepareSFields(sfields);
+ PrepareMethods(methods);
+ PrepareDiamond();
+ PrepareMIRs(mirs);
+ PerformClassInitCheckElimination();
+ ASSERT_EQ(arraysize(expected_class_initialized), mir_count_);
+ ASSERT_EQ(arraysize(expected_class_in_dex_cache), mir_count_);
+ for (size_t i = 0u; i != arraysize(mirs); ++i) {
+ EXPECT_EQ(expected_class_initialized[i],
+ (mirs_[i].optimization_flags & MIR_CLASS_IS_INITIALIZED) != 0) << i;
+ EXPECT_EQ(expected_class_in_dex_cache[i],
+ (mirs_[i].optimization_flags & MIR_CLASS_IS_IN_DEX_CACHE) != 0) << i;
}
}
@@ -437,15 +602,18 @@
static const SFieldDef sfields[] = {
{ 0u, 1u, 0u, 0u },
{ 1u, 1u, 1u, 1u },
+ { 2u, 1u, 2u, 2u },
};
static const MIRDef mirs[] = {
- DEF_SGET_SPUT_V0(3u, Instruction::SGET, 0u),
- DEF_SGET_SPUT_V0(4u, Instruction::SGET, 1u),
- DEF_SGET_SPUT_V0(5u, Instruction::SGET, 0u), // Eliminated.
- DEF_SGET_SPUT_V0(5u, Instruction::SGET, 1u), // Eliminated.
+ DEF_SGET_SPUT(3u, Instruction::SGET, 0u, 0u),
+ DEF_SGET_SPUT(4u, Instruction::SGET, 0u, 0u), // Eliminated.
+ DEF_SGET_SPUT(3u, Instruction::SGET, 0u, 1u),
+ DEF_SGET_SPUT(5u, Instruction::SGET, 0u, 1u), // Eliminated.
+ DEF_SGET_SPUT(4u, Instruction::SGET, 0u, 2u),
+ DEF_SGET_SPUT(5u, Instruction::SGET, 0u, 2u), // Eliminated.
};
static const bool expected_ignore_clinit_check[] = {
- false, false, true, true
+ false, true, false, true, false, true,
};
PrepareSFields(sfields);
@@ -455,7 +623,49 @@
ASSERT_EQ(arraysize(expected_ignore_clinit_check), mir_count_);
for (size_t i = 0u; i != arraysize(mirs); ++i) {
EXPECT_EQ(expected_ignore_clinit_check[i],
- (mirs_[i].optimization_flags & MIR_IGNORE_CLINIT_CHECK) != 0) << i;
+ (mirs_[i].optimization_flags & MIR_CLASS_IS_INITIALIZED) != 0) << i;
+ EXPECT_EQ(expected_ignore_clinit_check[i],
+ (mirs_[i].optimization_flags & MIR_CLASS_IS_IN_DEX_CACHE) != 0) << i;
+ }
+}
+
+TEST_F(ClassInitCheckEliminationTest, LoopWithInvokes) {
+ static const SFieldDef sfields[] = {
+ { 0u, 1u, 0u, 0u },
+ };
+ static const MethodDef methods[] = {
+ { 0u, 1u, 0u, 0u, kStatic, kStatic, false, false },
+ { 1u, 1u, 1u, 1u, kStatic, kStatic, false, false },
+ { 2u, 1u, 2u, 2u, kStatic, kStatic, false, false },
+ };
+ static const MIRDef mirs[] = {
+ DEF_INVOKE(3u, Instruction::INVOKE_STATIC, 0u /* dummy */, 0u),
+ DEF_INVOKE(4u, Instruction::INVOKE_STATIC, 0u /* dummy */, 0u),
+ DEF_INVOKE(3u, Instruction::INVOKE_STATIC, 0u /* dummy */, 1u),
+ DEF_INVOKE(5u, Instruction::INVOKE_STATIC, 0u /* dummy */, 1u),
+ DEF_INVOKE(4u, Instruction::INVOKE_STATIC, 0u /* dummy */, 2u),
+ DEF_INVOKE(5u, Instruction::INVOKE_STATIC, 0u /* dummy */, 2u),
+ DEF_SGET_SPUT(5u, Instruction::SGET, 0u, 0u),
+ };
+ static const bool expected_class_initialized[] = {
+ false, true, false, true, false, true, true,
+ };
+ static const bool expected_class_in_dex_cache[] = {
+ false, false, false, false, false, false, false,
+ };
+
+ PrepareSFields(sfields);
+ PrepareMethods(methods);
+ PrepareLoop();
+ PrepareMIRs(mirs);
+ PerformClassInitCheckElimination();
+ ASSERT_EQ(arraysize(expected_class_initialized), mir_count_);
+ ASSERT_EQ(arraysize(expected_class_in_dex_cache), mir_count_);
+ for (size_t i = 0u; i != arraysize(mirs); ++i) {
+ EXPECT_EQ(expected_class_initialized[i],
+ (mirs_[i].optimization_flags & MIR_CLASS_IS_INITIALIZED) != 0) << i;
+ EXPECT_EQ(expected_class_in_dex_cache[i],
+ (mirs_[i].optimization_flags & MIR_CLASS_IS_IN_DEX_CACHE) != 0) << i;
}
}
@@ -467,16 +677,16 @@
{ 3u, 1u, 3u, 3u },
};
static const MIRDef mirs[] = {
- DEF_SGET_SPUT_V0(3u, Instruction::SGET, 0u), // Before the exception edge.
- DEF_SGET_SPUT_V0(3u, Instruction::SGET, 1u), // Before the exception edge.
- DEF_SGET_SPUT_V0(4u, Instruction::SGET, 2u), // After the exception edge.
- DEF_SGET_SPUT_V0(4u, Instruction::SGET, 3u), // After the exception edge.
- DEF_SGET_SPUT_V0(5u, Instruction::SGET, 0u), // In catch handler; clinit check eliminated.
- DEF_SGET_SPUT_V0(5u, Instruction::SGET, 2u), // In catch handler; clinit check not eliminated.
- DEF_SGET_SPUT_V0(6u, Instruction::SGET, 0u), // Class init check eliminated.
- DEF_SGET_SPUT_V0(6u, Instruction::SGET, 1u), // Class init check eliminated.
- DEF_SGET_SPUT_V0(6u, Instruction::SGET, 2u), // Class init check eliminated.
- DEF_SGET_SPUT_V0(6u, Instruction::SGET, 3u), // Class init check not eliminated.
+ DEF_SGET_SPUT(3u, Instruction::SGET, 0u, 0u), // Before the exception edge.
+ DEF_SGET_SPUT(3u, Instruction::SGET, 0u, 1u), // Before the exception edge.
+ DEF_SGET_SPUT(4u, Instruction::SGET, 0u, 2u), // After the exception edge.
+ DEF_SGET_SPUT(4u, Instruction::SGET, 0u, 3u), // After the exception edge.
+ DEF_SGET_SPUT(5u, Instruction::SGET, 0u, 0u), // In catch handler; eliminated.
+ DEF_SGET_SPUT(5u, Instruction::SGET, 0u, 2u), // In catch handler; not eliminated.
+ DEF_SGET_SPUT(6u, Instruction::SGET, 0u, 0u), // Class init check eliminated.
+ DEF_SGET_SPUT(6u, Instruction::SGET, 0u, 1u), // Class init check eliminated.
+ DEF_SGET_SPUT(6u, Instruction::SGET, 0u, 2u), // Class init check eliminated.
+ DEF_SGET_SPUT(6u, Instruction::SGET, 0u, 3u), // Class init check not eliminated.
};
static const bool expected_ignore_clinit_check[] = {
false, false, false, false, true, false, true, true, true, false
@@ -489,21 +699,12 @@
ASSERT_EQ(arraysize(expected_ignore_clinit_check), mir_count_);
for (size_t i = 0u; i != arraysize(mirs); ++i) {
EXPECT_EQ(expected_ignore_clinit_check[i],
- (mirs_[i].optimization_flags & MIR_IGNORE_CLINIT_CHECK) != 0) << i;
+ (mirs_[i].optimization_flags & MIR_CLASS_IS_INITIALIZED) != 0) << i;
+ EXPECT_EQ(expected_ignore_clinit_check[i],
+ (mirs_[i].optimization_flags & MIR_CLASS_IS_IN_DEX_CACHE) != 0) << i;
}
}
-#define DEF_IGET_IPUT(bb, opcode, vA, vB, field_info) \
- { bb, opcode, field_info, vA, vB, 0u }
-#define DEF_AGET_APUT(bb, opcode, vA, vB, vC) \
- { bb, opcode, 0u, vA, vB, vC }
-#define DEF_INVOKE(bb, opcode, vC) \
- { bb, opcode, 0u, 0u, 0u, vC }
-#define DEF_OTHER1(bb, opcode, vA) \
- { bb, opcode, 0u, vA, 0u, 0u }
-#define DEF_OTHER2(bb, opcode, vA, vB) \
- { bb, opcode, 0u, vA, vB, 0u }
-
TEST_F(NullCheckEliminationTest, SingleBlock) {
static const IFieldDef ifields[] = {
{ 0u, 1u, 0u, 0u },
@@ -525,10 +726,10 @@
DEF_IGET_IPUT(3u, Instruction::IPUT, 11u, 105u, 1u),
DEF_IGET_IPUT(3u, Instruction::IPUT, 12u, 106u, 0u),
DEF_IGET_IPUT(3u, Instruction::IGET, 13u, 106u, 1u),
- DEF_INVOKE(3u, Instruction::INVOKE_DIRECT, 107),
+ DEF_INVOKE(3u, Instruction::INVOKE_DIRECT, 107, 0u /* dummy */),
DEF_IGET_IPUT(3u, Instruction::IGET, 15u, 107u, 1u),
DEF_IGET_IPUT(3u, Instruction::IGET, 16u, 108u, 0u),
- DEF_INVOKE(3u, Instruction::INVOKE_DIRECT, 108),
+ DEF_INVOKE(3u, Instruction::INVOKE_DIRECT, 108, 0u /* dummy */),
DEF_AGET_APUT(3u, Instruction::AGET, 18u, 109u, 110u),
DEF_AGET_APUT(3u, Instruction::APUT, 19u, 109u, 111u),
DEF_OTHER2(3u, Instruction::ARRAY_LENGTH, 20u, 112u),
@@ -583,7 +784,7 @@
DEF_IGET_IPUT(6u, Instruction::IPUT, 7u, 103u, 1u), // Not eliminated (going through BB #5).
DEF_IGET_IPUT(5u, Instruction::IGET, 8u, 104u, 1u),
DEF_IGET_IPUT(6u, Instruction::IGET, 9u, 104u, 0u), // Not eliminated (going through BB #4).
- DEF_INVOKE(4u, Instruction::INVOKE_DIRECT, 105u),
+ DEF_INVOKE(4u, Instruction::INVOKE_DIRECT, 105u, 0u /* dummy */),
DEF_IGET_IPUT(5u, Instruction::IGET, 11u, 105u, 1u),
DEF_IGET_IPUT(6u, Instruction::IPUT, 12u, 105u, 0u), // Eliminated.
DEF_IGET_IPUT(3u, Instruction::IGET_OBJECT, 13u, 106u, 2u),
diff --git a/compiler/dex/quick/gen_common.cc b/compiler/dex/quick/gen_common.cc
index 2abfcc3..d76a870 100644
--- a/compiler/dex/quick/gen_common.cc
+++ b/compiler/dex/quick/gen_common.cc
@@ -522,15 +522,21 @@
//
class StaticFieldSlowPath : public Mir2Lir::LIRSlowPath {
public:
+ // There are up to two branches to the static field slow path, the "unresolved" when the type
+ // entry in the dex cache is null, and the "uninit" when the class is not yet initialized.
+ // At least one will be non-null here, otherwise we wouldn't generate the slow path.
StaticFieldSlowPath(Mir2Lir* m2l, LIR* unresolved, LIR* uninit, LIR* cont, int storage_index,
- RegStorage r_base) :
- LIRSlowPath(m2l, m2l->GetCurrentDexPc(), unresolved, cont), uninit_(uninit),
- storage_index_(storage_index), r_base_(r_base) {
+ RegStorage r_base)
+ : LIRSlowPath(m2l, m2l->GetCurrentDexPc(), unresolved != nullptr ? unresolved : uninit, cont),
+ second_branch_(unresolved != nullptr ? uninit : nullptr),
+ storage_index_(storage_index), r_base_(r_base) {
}
void Compile() {
- LIR* unresolved_target = GenerateTargetLabel();
- uninit_->target = unresolved_target;
+ LIR* target = GenerateTargetLabel();
+ if (second_branch_ != nullptr) {
+ second_branch_->target = target;
+ }
m2l_->CallRuntimeHelperImm(kQuickInitializeStaticStorage, storage_index_, true);
// Copy helper's result into r_base, a no-op on all but MIPS.
m2l_->OpRegCopy(r_base_, m2l_->TargetReg(kRet0, kRef));
@@ -539,7 +545,9 @@
}
private:
- LIR* const uninit_;
+ // Second branch to the slow path, or null if there's only one branch.
+ LIR* const second_branch_;
+
const int storage_index_;
const RegStorage r_base_;
};
@@ -577,30 +585,38 @@
int32_t offset_of_field = ObjArray::OffsetOfElement(field_info.StorageIndex()).Int32Value();
LoadRefDisp(r_base, offset_of_field, r_base, kNotVolatile);
// r_base now points at static storage (Class*) or NULL if the type is not yet resolved.
- if (!field_info.IsInitialized() &&
- (mir->optimization_flags & MIR_IGNORE_CLINIT_CHECK) == 0) {
- // Check if r_base is NULL or a not yet initialized class.
-
- // The slow path is invoked if the r_base is NULL or the class pointed
- // to by it is not initialized.
- LIR* unresolved_branch = OpCmpImmBranch(kCondEq, r_base, 0, NULL);
+ LIR* unresolved_branch = nullptr;
+ if (!field_info.IsClassInDexCache() &&
+ (mir->optimization_flags & MIR_CLASS_IS_IN_DEX_CACHE) == 0) {
+ // Check if r_base is NULL.
+ unresolved_branch = OpCmpImmBranch(kCondEq, r_base, 0, NULL);
+ }
+ LIR* uninit_branch = nullptr;
+ if (!field_info.IsClassInitialized() &&
+ (mir->optimization_flags & MIR_CLASS_IS_INITIALIZED) == 0) {
+ // Check if r_base is not yet initialized class.
RegStorage r_tmp = TargetReg(kArg2, kNotWide);
LockTemp(r_tmp);
- LIR* uninit_branch = OpCmpMemImmBranch(kCondLt, r_tmp, r_base,
+ uninit_branch = OpCmpMemImmBranch(kCondLt, r_tmp, r_base,
mirror::Class::StatusOffset().Int32Value(),
mirror::Class::kStatusInitialized, nullptr, nullptr);
+ FreeTemp(r_tmp);
+ }
+ if (unresolved_branch != nullptr || uninit_branch != nullptr) {
+ // The slow path is invoked if the r_base is NULL or the class pointed
+ // to by it is not initialized.
LIR* cont = NewLIR0(kPseudoTargetLabel);
-
AddSlowPath(new (arena_) StaticFieldSlowPath(this, unresolved_branch, uninit_branch, cont,
field_info.StorageIndex(), r_base));
- FreeTemp(r_tmp);
- // Ensure load of status and store of value don't re-order.
- // TODO: Presumably the actual value store is control-dependent on the status load,
- // and will thus not be reordered in any case, since stores are never speculated.
- // Does later code "know" that the class is now initialized? If so, we still
- // need the barrier to guard later static loads.
- GenMemBarrier(kLoadAny);
+ if (uninit_branch != nullptr) {
+ // Ensure load of status and store of value don't re-order.
+ // TODO: Presumably the actual value store is control-dependent on the status load,
+ // and will thus not be reordered in any case, since stores are never speculated.
+ // Does later code "know" that the class is now initialized? If so, we still
+ // need the barrier to guard later static loads.
+ GenMemBarrier(kLoadAny);
+ }
}
FreeTemp(r_method);
}
@@ -684,26 +700,34 @@
int32_t offset_of_field = ObjArray::OffsetOfElement(field_info.StorageIndex()).Int32Value();
LoadRefDisp(r_base, offset_of_field, r_base, kNotVolatile);
// r_base now points at static storage (Class*) or NULL if the type is not yet resolved.
- if (!field_info.IsInitialized() &&
- (mir->optimization_flags & MIR_IGNORE_CLINIT_CHECK) == 0) {
- // Check if r_base is NULL or a not yet initialized class.
-
- // The slow path is invoked if the r_base is NULL or the class pointed
- // to by it is not initialized.
- LIR* unresolved_branch = OpCmpImmBranch(kCondEq, r_base, 0, NULL);
+ LIR* unresolved_branch = nullptr;
+ if (!field_info.IsClassInDexCache() &&
+ (mir->optimization_flags & MIR_CLASS_IS_IN_DEX_CACHE) == 0) {
+ // Check if r_base is NULL.
+ unresolved_branch = OpCmpImmBranch(kCondEq, r_base, 0, NULL);
+ }
+ LIR* uninit_branch = nullptr;
+ if (!field_info.IsClassInitialized() &&
+ (mir->optimization_flags & MIR_CLASS_IS_INITIALIZED) == 0) {
+ // Check if r_base is not yet initialized class.
RegStorage r_tmp = TargetReg(kArg2, kNotWide);
LockTemp(r_tmp);
- LIR* uninit_branch = OpCmpMemImmBranch(kCondLt, r_tmp, r_base,
+ uninit_branch = OpCmpMemImmBranch(kCondLt, r_tmp, r_base,
mirror::Class::StatusOffset().Int32Value(),
mirror::Class::kStatusInitialized, nullptr, nullptr);
+ FreeTemp(r_tmp);
+ }
+ if (unresolved_branch != nullptr || uninit_branch != nullptr) {
+ // The slow path is invoked if the r_base is NULL or the class pointed
+ // to by it is not initialized.
LIR* cont = NewLIR0(kPseudoTargetLabel);
-
AddSlowPath(new (arena_) StaticFieldSlowPath(this, unresolved_branch, uninit_branch, cont,
field_info.StorageIndex(), r_base));
- FreeTemp(r_tmp);
- // Ensure load of status and load of value don't re-order.
- GenMemBarrier(kLoadAny);
+ if (uninit_branch != nullptr) {
+ // Ensure load of status and load of value don't re-order.
+ GenMemBarrier(kLoadAny);
+ }
}
FreeTemp(r_method);
}
diff --git a/compiler/driver/compiler_driver-inl.h b/compiler/driver/compiler_driver-inl.h
index 3325568..1805d59 100644
--- a/compiler/driver/compiler_driver-inl.h
+++ b/compiler/driver/compiler_driver-inl.h
@@ -93,6 +93,10 @@
return field->IsVolatile();
}
+inline MemberOffset CompilerDriver::GetFieldOffset(mirror::ArtField* field) {
+ return field->GetOffset();
+}
+
inline std::pair<bool, bool> CompilerDriver::IsFastInstanceField(
mirror::DexCache* dex_cache, mirror::Class* referrer_class,
mirror::ArtField* resolved_field, uint16_t field_idx) {
@@ -107,16 +111,12 @@
inline std::pair<bool, bool> CompilerDriver::IsFastStaticField(
mirror::DexCache* dex_cache, mirror::Class* referrer_class,
- mirror::ArtField* resolved_field, uint16_t field_idx, MemberOffset* field_offset,
- uint32_t* storage_index, bool* is_referrers_class, bool* is_initialized) {
+ mirror::ArtField* resolved_field, uint16_t field_idx, uint32_t* storage_index) {
DCHECK(resolved_field->IsStatic());
if (LIKELY(referrer_class != nullptr)) {
mirror::Class* fields_class = resolved_field->GetDeclaringClass();
if (fields_class == referrer_class) {
- *field_offset = resolved_field->GetOffset();
*storage_index = fields_class->GetDexTypeIndex();
- *is_referrers_class = true; // implies no worrying about class initialization
- *is_initialized = true;
return std::make_pair(true, true);
}
if (referrer_class->CanAccessResolvedField(fields_class, resolved_field,
@@ -148,23 +148,30 @@
}
}
if (storage_idx != DexFile::kDexNoIndex) {
- *field_offset = resolved_field->GetOffset();
*storage_index = storage_idx;
- *is_referrers_class = false;
- *is_initialized = fields_class->IsInitialized() &&
- CanAssumeTypeIsPresentInDexCache(*dex_file, storage_idx);
return std::make_pair(true, !resolved_field->IsFinal());
}
}
}
// Conservative defaults.
- *field_offset = MemberOffset(0u);
*storage_index = DexFile::kDexNoIndex;
- *is_referrers_class = false;
- *is_initialized = false;
return std::make_pair(false, false);
}
+inline bool CompilerDriver::IsStaticFieldInReferrerClass(mirror::Class* referrer_class,
+ mirror::ArtField* resolved_field) {
+ DCHECK(resolved_field->IsStatic());
+ mirror::Class* fields_class = resolved_field->GetDeclaringClass();
+ return referrer_class == fields_class;
+}
+
+inline bool CompilerDriver::IsStaticFieldsClassInitialized(mirror::Class* referrer_class,
+ mirror::ArtField* resolved_field) {
+ DCHECK(resolved_field->IsStatic());
+ mirror::Class* fields_class = resolved_field->GetDeclaringClass();
+ return fields_class == referrer_class || fields_class->IsInitialized();
+}
+
inline mirror::ArtMethod* CompilerDriver::ResolveMethod(
ScopedObjectAccess& soa, Handle<mirror::DexCache> dex_cache,
Handle<mirror::ClassLoader> class_loader, const DexCompilationUnit* mUnit,
@@ -312,14 +319,13 @@
return stats_flags;
}
-inline bool CompilerDriver::NeedsClassInitialization(mirror::Class* referrer_class,
- mirror::ArtMethod* resolved_method) {
+inline bool CompilerDriver::IsMethodsClassInitialized(mirror::Class* referrer_class,
+ mirror::ArtMethod* resolved_method) {
if (!resolved_method->IsStatic()) {
- return false;
+ return true;
}
mirror::Class* methods_class = resolved_method->GetDeclaringClass();
- // NOTE: Unlike in IsFastStaticField(), we don't check CanAssumeTypeIsPresentInDexCache() here.
- return methods_class != referrer_class && !methods_class->IsInitialized();
+ return methods_class == referrer_class || methods_class->IsInitialized();
}
} // namespace art
diff --git a/compiler/driver/compiler_driver.cc b/compiler/driver/compiler_driver.cc
index a60c5bc..eb5739f 100644
--- a/compiler/driver/compiler_driver.cc
+++ b/compiler/driver/compiler_driver.cc
@@ -1094,11 +1094,17 @@
if (resolved_field != nullptr && referrer_class != nullptr) {
*is_volatile = IsFieldVolatile(resolved_field);
std::pair<bool, bool> fast_path = IsFastStaticField(
- dex_cache, referrer_class, resolved_field, field_idx, field_offset,
- storage_index, is_referrers_class, is_initialized);
+ dex_cache, referrer_class, resolved_field, field_idx, storage_index);
result = is_put ? fast_path.second : fast_path.first;
}
- if (!result) {
+ if (result) {
+ *field_offset = GetFieldOffset(resolved_field);
+ *is_referrers_class = IsStaticFieldInReferrerClass(referrer_class, resolved_field);
+ // *is_referrers_class == true implies no worrying about class initialization.
+ *is_initialized = (*is_referrers_class) ||
+ (IsStaticFieldsClassInitialized(referrer_class, resolved_field) &&
+ CanAssumeTypeIsPresentInDexCache(*mUnit->GetDexFile(), *storage_index));
+ } else {
// Conservative defaults.
*is_volatile = true;
*field_offset = MemberOffset(static_cast<size_t>(-1));
diff --git a/compiler/driver/compiler_driver.h b/compiler/driver/compiler_driver.h
index 0796f48..6764aef 100644
--- a/compiler/driver/compiler_driver.h
+++ b/compiler/driver/compiler_driver.h
@@ -233,6 +233,7 @@
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
bool IsFieldVolatile(mirror::ArtField* field) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+ MemberOffset GetFieldOffset(mirror::ArtField* field) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Can we fast-path an IGET/IPUT access to an instance field? If yes, compute the field offset.
std::pair<bool, bool> IsFastInstanceField(
@@ -240,13 +241,20 @@
mirror::ArtField* resolved_field, uint16_t field_idx)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
- // Can we fast-path an SGET/SPUT access to a static field? If yes, compute the field offset,
- // the type index of the declaring class in the referrer's dex file and whether the declaring
- // class is the referrer's class or at least can be assumed to be initialized.
+ // Can we fast-path an SGET/SPUT access to a static field? If yes, compute the type index
+ // of the declaring class in the referrer's dex file.
std::pair<bool, bool> IsFastStaticField(
mirror::DexCache* dex_cache, mirror::Class* referrer_class,
- mirror::ArtField* resolved_field, uint16_t field_idx, MemberOffset* field_offset,
- uint32_t* storage_index, bool* is_referrers_class, bool* is_initialized)
+ mirror::ArtField* resolved_field, uint16_t field_idx, uint32_t* storage_index)
+ SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+
+ // Is static field's in referrer's class?
+ bool IsStaticFieldInReferrerClass(mirror::Class* referrer_class, mirror::ArtField* resolved_field)
+ SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+
+ // Is static field's class initialized?
+ bool IsStaticFieldsClassInitialized(mirror::Class* referrer_class,
+ mirror::ArtField* resolved_field)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Resolve a method. Returns nullptr on failure, including incompatible class change.
@@ -277,8 +285,10 @@
uintptr_t* direct_code, uintptr_t* direct_method)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
- // Does invokation of the resolved method need class initialization?
- bool NeedsClassInitialization(mirror::Class* referrer_class, mirror::ArtMethod* resolved_method)
+ // Is method's class initialized for an invoke?
+ // For static invokes to determine whether we need to consider potential call to <clinit>().
+ // For non-static invokes, assuming a non-null reference, the class is always initialized.
+ bool IsMethodsClassInitialized(mirror::Class* referrer_class, mirror::ArtMethod* resolved_method)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void ProcessedInstanceField(bool resolved);
