Don't use StringFactory.newEmptyString in compiled code

When compiling debuggable code we would compile a new-instance String
instruction into a StringFactory.newEmptyString invoke. This
additional invoke could be observed using tracing and is inconsistent
with the interpreter, where the string is simply allocated directly.
In order to bring these two modes into alignment we added a new
AllocStringObject quick entrypoint that will be used instead of the
normal AllocObject<...> entrypoints when allocating a string. This
entrypoint directly allocates a new string in the same manner the
interpreter does.

Needs next CL for test to work.

Bug: 110884646
Test: ./test/testrunner/testrunner.py --host --runtime-option=-Xjitthreshold:0 --jit
Test: Manual inspection of compiled code.
Change-Id: I7b4b084bcf7dd9a23485c0e3cd2cd04a04b43d3d
diff --git a/compiler/optimizing/code_generator_arm64.cc b/compiler/optimizing/code_generator_arm64.cc
index 26c9e9f..d1c83ce 100644
--- a/compiler/optimizing/code_generator_arm64.cc
+++ b/compiler/optimizing/code_generator_arm64.cc
@@ -5493,36 +5493,13 @@
   LocationSummary* locations = new (GetGraph()->GetAllocator()) LocationSummary(
       instruction, LocationSummary::kCallOnMainOnly);
   InvokeRuntimeCallingConvention calling_convention;
-  if (instruction->IsStringAlloc()) {
-    locations->AddTemp(LocationFrom(kArtMethodRegister));
-  } else {
-    locations->SetInAt(0, LocationFrom(calling_convention.GetRegisterAt(0)));
-  }
+  locations->SetInAt(0, LocationFrom(calling_convention.GetRegisterAt(0)));
   locations->SetOut(calling_convention.GetReturnLocation(DataType::Type::kReference));
 }
 
 void InstructionCodeGeneratorARM64::VisitNewInstance(HNewInstance* instruction) {
-  // Note: if heap poisoning is enabled, the entry point takes cares
-  // of poisoning the reference.
-  if (instruction->IsStringAlloc()) {
-    // String is allocated through StringFactory. Call NewEmptyString entry point.
-    Location temp = instruction->GetLocations()->GetTemp(0);
-    MemberOffset code_offset = ArtMethod::EntryPointFromQuickCompiledCodeOffset(kArm64PointerSize);
-    __ Ldr(XRegisterFrom(temp), MemOperand(tr, QUICK_ENTRY_POINT(pNewEmptyString)));
-    __ Ldr(lr, MemOperand(XRegisterFrom(temp), code_offset.Int32Value()));
-
-    {
-      // Ensure the pc position is recorded immediately after the `blr` instruction.
-      ExactAssemblyScope eas(GetVIXLAssembler(),
-                             kInstructionSize,
-                             CodeBufferCheckScope::kExactSize);
-      __ blr(lr);
-      codegen_->RecordPcInfo(instruction, instruction->GetDexPc());
-    }
-  } else {
-    codegen_->InvokeRuntime(instruction->GetEntrypoint(), instruction, instruction->GetDexPc());
-    CheckEntrypointTypes<kQuickAllocObjectWithChecks, void*, mirror::Class*>();
-  }
+  codegen_->InvokeRuntime(instruction->GetEntrypoint(), instruction, instruction->GetDexPc());
+  CheckEntrypointTypes<kQuickAllocObjectWithChecks, void*, mirror::Class*>();
   codegen_->MaybeGenerateMarkingRegisterCheck(/* code */ __LINE__);
 }
 
diff --git a/compiler/optimizing/code_generator_arm_vixl.cc b/compiler/optimizing/code_generator_arm_vixl.cc
index 9e1ef40..deab239 100644
--- a/compiler/optimizing/code_generator_arm_vixl.cc
+++ b/compiler/optimizing/code_generator_arm_vixl.cc
@@ -5479,34 +5479,14 @@
 void LocationsBuilderARMVIXL::VisitNewInstance(HNewInstance* instruction) {
   LocationSummary* locations = new (GetGraph()->GetAllocator()) LocationSummary(
       instruction, LocationSummary::kCallOnMainOnly);
-  if (instruction->IsStringAlloc()) {
-    locations->AddTemp(LocationFrom(kMethodRegister));
-  } else {
-    InvokeRuntimeCallingConventionARMVIXL calling_convention;
-    locations->SetInAt(0, LocationFrom(calling_convention.GetRegisterAt(0)));
-  }
+  InvokeRuntimeCallingConventionARMVIXL calling_convention;
+  locations->SetInAt(0, LocationFrom(calling_convention.GetRegisterAt(0)));
   locations->SetOut(LocationFrom(r0));
 }
 
 void InstructionCodeGeneratorARMVIXL::VisitNewInstance(HNewInstance* instruction) {
-  // Note: if heap poisoning is enabled, the entry point takes cares
-  // of poisoning the reference.
-  if (instruction->IsStringAlloc()) {
-    // String is allocated through StringFactory. Call NewEmptyString entry point.
-    vixl32::Register temp = RegisterFrom(instruction->GetLocations()->GetTemp(0));
-    MemberOffset code_offset = ArtMethod::EntryPointFromQuickCompiledCodeOffset(kArmPointerSize);
-    GetAssembler()->LoadFromOffset(kLoadWord, temp, tr, QUICK_ENTRY_POINT(pNewEmptyString));
-    GetAssembler()->LoadFromOffset(kLoadWord, lr, temp, code_offset.Int32Value());
-    // blx in T32 has only 16bit encoding that's why a stricter check for the scope is used.
-    ExactAssemblyScope aas(GetVIXLAssembler(),
-                           vixl32::k16BitT32InstructionSizeInBytes,
-                           CodeBufferCheckScope::kExactSize);
-    __ blx(lr);
-    codegen_->RecordPcInfo(instruction, instruction->GetDexPc());
-  } else {
-    codegen_->InvokeRuntime(instruction->GetEntrypoint(), instruction, instruction->GetDexPc());
-    CheckEntrypointTypes<kQuickAllocObjectWithChecks, void*, mirror::Class*>();
-  }
+  codegen_->InvokeRuntime(instruction->GetEntrypoint(), instruction, instruction->GetDexPc());
+  CheckEntrypointTypes<kQuickAllocObjectWithChecks, void*, mirror::Class*>();
   codegen_->MaybeGenerateMarkingRegisterCheck(/* code */ 11);
 }
 
diff --git a/compiler/optimizing/code_generator_mips.cc b/compiler/optimizing/code_generator_mips.cc
index f0ef30e..c7295e4 100644
--- a/compiler/optimizing/code_generator_mips.cc
+++ b/compiler/optimizing/code_generator_mips.cc
@@ -8701,30 +8701,13 @@
   LocationSummary* locations = new (GetGraph()->GetAllocator()) LocationSummary(
       instruction, LocationSummary::kCallOnMainOnly);
   InvokeRuntimeCallingConvention calling_convention;
-  if (instruction->IsStringAlloc()) {
-    locations->AddTemp(Location::RegisterLocation(kMethodRegisterArgument));
-  } else {
-    locations->SetInAt(0, Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
-  }
+  locations->SetInAt(0, Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
   locations->SetOut(calling_convention.GetReturnLocation(DataType::Type::kReference));
 }
 
 void InstructionCodeGeneratorMIPS::VisitNewInstance(HNewInstance* instruction) {
-  // Note: if heap poisoning is enabled, the entry point takes care
-  // of poisoning the reference.
-  if (instruction->IsStringAlloc()) {
-    // String is allocated through StringFactory. Call NewEmptyString entry point.
-    Register temp = instruction->GetLocations()->GetTemp(0).AsRegister<Register>();
-    MemberOffset code_offset = ArtMethod::EntryPointFromQuickCompiledCodeOffset(kMipsPointerSize);
-    __ LoadFromOffset(kLoadWord, temp, TR, QUICK_ENTRY_POINT(pNewEmptyString));
-    __ LoadFromOffset(kLoadWord, T9, temp, code_offset.Int32Value());
-    __ Jalr(T9);
-    __ NopIfNoReordering();
-    codegen_->RecordPcInfo(instruction, instruction->GetDexPc());
-  } else {
-    codegen_->InvokeRuntime(instruction->GetEntrypoint(), instruction, instruction->GetDexPc());
-    CheckEntrypointTypes<kQuickAllocObjectWithChecks, void*, mirror::Class*>();
-  }
+  codegen_->InvokeRuntime(instruction->GetEntrypoint(), instruction, instruction->GetDexPc());
+  CheckEntrypointTypes<kQuickAllocObjectWithChecks, void*, mirror::Class*>();
 }
 
 void LocationsBuilderMIPS::VisitNot(HNot* instruction) {
diff --git a/compiler/optimizing/code_generator_mips64.cc b/compiler/optimizing/code_generator_mips64.cc
index 6e72727..ffde45e 100644
--- a/compiler/optimizing/code_generator_mips64.cc
+++ b/compiler/optimizing/code_generator_mips64.cc
@@ -6632,31 +6632,13 @@
   LocationSummary* locations = new (GetGraph()->GetAllocator()) LocationSummary(
       instruction, LocationSummary::kCallOnMainOnly);
   InvokeRuntimeCallingConvention calling_convention;
-  if (instruction->IsStringAlloc()) {
-    locations->AddTemp(Location::RegisterLocation(kMethodRegisterArgument));
-  } else {
-    locations->SetInAt(0, Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
-  }
+  locations->SetInAt(0, Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
   locations->SetOut(calling_convention.GetReturnLocation(DataType::Type::kReference));
 }
 
 void InstructionCodeGeneratorMIPS64::VisitNewInstance(HNewInstance* instruction) {
-  // Note: if heap poisoning is enabled, the entry point takes care
-  // of poisoning the reference.
-  if (instruction->IsStringAlloc()) {
-    // String is allocated through StringFactory. Call NewEmptyString entry point.
-    GpuRegister temp = instruction->GetLocations()->GetTemp(0).AsRegister<GpuRegister>();
-    MemberOffset code_offset =
-        ArtMethod::EntryPointFromQuickCompiledCodeOffset(kMips64PointerSize);
-    __ LoadFromOffset(kLoadDoubleword, temp, TR, QUICK_ENTRY_POINT(pNewEmptyString));
-    __ LoadFromOffset(kLoadDoubleword, T9, temp, code_offset.Int32Value());
-    __ Jalr(T9);
-    __ Nop();
-    codegen_->RecordPcInfo(instruction, instruction->GetDexPc());
-  } else {
-    codegen_->InvokeRuntime(instruction->GetEntrypoint(), instruction, instruction->GetDexPc());
-    CheckEntrypointTypes<kQuickAllocObjectWithChecks, void*, mirror::Class*>();
-  }
+  codegen_->InvokeRuntime(instruction->GetEntrypoint(), instruction, instruction->GetDexPc());
+  CheckEntrypointTypes<kQuickAllocObjectWithChecks, void*, mirror::Class*>();
 }
 
 void LocationsBuilderMIPS64::VisitNot(HNot* instruction) {
diff --git a/compiler/optimizing/code_generator_x86.cc b/compiler/optimizing/code_generator_x86.cc
index d189476..1c0d283 100644
--- a/compiler/optimizing/code_generator_x86.cc
+++ b/compiler/optimizing/code_generator_x86.cc
@@ -4496,29 +4496,14 @@
   LocationSummary* locations = new (GetGraph()->GetAllocator()) LocationSummary(
       instruction, LocationSummary::kCallOnMainOnly);
   locations->SetOut(Location::RegisterLocation(EAX));
-  if (instruction->IsStringAlloc()) {
-    locations->AddTemp(Location::RegisterLocation(kMethodRegisterArgument));
-  } else {
-    InvokeRuntimeCallingConvention calling_convention;
-    locations->SetInAt(0, Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
-  }
+  InvokeRuntimeCallingConvention calling_convention;
+  locations->SetInAt(0, Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
 }
 
 void InstructionCodeGeneratorX86::VisitNewInstance(HNewInstance* instruction) {
-  // Note: if heap poisoning is enabled, the entry point takes cares
-  // of poisoning the reference.
-  if (instruction->IsStringAlloc()) {
-    // String is allocated through StringFactory. Call NewEmptyString entry point.
-    Register temp = instruction->GetLocations()->GetTemp(0).AsRegister<Register>();
-    MemberOffset code_offset = ArtMethod::EntryPointFromQuickCompiledCodeOffset(kX86PointerSize);
-    __ fs()->movl(temp, Address::Absolute(QUICK_ENTRY_POINT(pNewEmptyString)));
-    __ call(Address(temp, code_offset.Int32Value()));
-    codegen_->RecordPcInfo(instruction, instruction->GetDexPc());
-  } else {
-    codegen_->InvokeRuntime(instruction->GetEntrypoint(), instruction, instruction->GetDexPc());
-    CheckEntrypointTypes<kQuickAllocObjectWithChecks, void*, mirror::Class*>();
-    DCHECK(!codegen_->IsLeafMethod());
-  }
+  codegen_->InvokeRuntime(instruction->GetEntrypoint(), instruction, instruction->GetDexPc());
+  CheckEntrypointTypes<kQuickAllocObjectWithChecks, void*, mirror::Class*>();
+  DCHECK(!codegen_->IsLeafMethod());
 }
 
 void LocationsBuilderX86::VisitNewArray(HNewArray* instruction) {
diff --git a/compiler/optimizing/code_generator_x86_64.cc b/compiler/optimizing/code_generator_x86_64.cc
index bea3da0..3073be6 100644
--- a/compiler/optimizing/code_generator_x86_64.cc
+++ b/compiler/optimizing/code_generator_x86_64.cc
@@ -4343,29 +4343,14 @@
   LocationSummary* locations = new (GetGraph()->GetAllocator()) LocationSummary(
       instruction, LocationSummary::kCallOnMainOnly);
   InvokeRuntimeCallingConvention calling_convention;
-  if (instruction->IsStringAlloc()) {
-    locations->AddTemp(Location::RegisterLocation(kMethodRegisterArgument));
-  } else {
-    locations->SetInAt(0, Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
-  }
+  locations->SetInAt(0, Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
   locations->SetOut(Location::RegisterLocation(RAX));
 }
 
 void InstructionCodeGeneratorX86_64::VisitNewInstance(HNewInstance* instruction) {
-  // Note: if heap poisoning is enabled, the entry point takes cares
-  // of poisoning the reference.
-  if (instruction->IsStringAlloc()) {
-    // String is allocated through StringFactory. Call NewEmptyString entry point.
-    CpuRegister temp = instruction->GetLocations()->GetTemp(0).AsRegister<CpuRegister>();
-    MemberOffset code_offset = ArtMethod::EntryPointFromQuickCompiledCodeOffset(kX86_64PointerSize);
-    __ gs()->movq(temp, Address::Absolute(QUICK_ENTRY_POINT(pNewEmptyString), /* no_rip */ true));
-    __ call(Address(temp, code_offset.SizeValue()));
-    codegen_->RecordPcInfo(instruction, instruction->GetDexPc());
-  } else {
-    codegen_->InvokeRuntime(instruction->GetEntrypoint(), instruction, instruction->GetDexPc());
-    CheckEntrypointTypes<kQuickAllocObjectWithChecks, void*, mirror::Class*>();
-    DCHECK(!codegen_->IsLeafMethod());
-  }
+  codegen_->InvokeRuntime(instruction->GetEntrypoint(), instruction, instruction->GetDexPc());
+  CheckEntrypointTypes<kQuickAllocObjectWithChecks, void*, mirror::Class*>();
+  DCHECK(!codegen_->IsLeafMethod());
 }
 
 void LocationsBuilderX86_64::VisitNewArray(HNewArray* instruction) {
diff --git a/compiler/optimizing/instruction_builder.cc b/compiler/optimizing/instruction_builder.cc
index 731accd..ba160e5 100644
--- a/compiler/optimizing/instruction_builder.cc
+++ b/compiler/optimizing/instruction_builder.cc
@@ -1075,6 +1075,10 @@
   if (load_class->NeedsAccessCheck() || klass->IsFinalizable() || !klass->IsInstantiable()) {
     entrypoint = kQuickAllocObjectWithChecks;
   }
+  // We will always be able to resolve the string class since it is in the BCP.
+  if (!klass.IsNull() && klass->IsStringClass()) {
+    entrypoint = kQuickAllocStringObject;
+  }
 
   // Consider classes we haven't resolved as potentially finalizable.
   bool finalizable = (klass == nullptr) || klass->IsFinalizable();
diff --git a/compiler/optimizing/nodes.cc b/compiler/optimizing/nodes.cc
index d243331..50ce755 100644
--- a/compiler/optimizing/nodes.cc
+++ b/compiler/optimizing/nodes.cc
@@ -2892,8 +2892,7 @@
 }
 
 bool HNewInstance::IsStringAlloc() const {
-  ScopedObjectAccess soa(Thread::Current());
-  return GetReferenceTypeInfo().IsStringClass();
+  return GetEntrypoint() == kQuickAllocStringObject;
 }
 
 bool HInvoke::NeedsEnvironment() const {
diff --git a/compiler/utils/assembler_thumb_test_expected.cc.inc b/compiler/utils/assembler_thumb_test_expected.cc.inc
index e76e98a..85e4326 100644
--- a/compiler/utils/assembler_thumb_test_expected.cc.inc
+++ b/compiler/utils/assembler_thumb_test_expected.cc.inc
@@ -153,7 +153,7 @@
   " 21c:	f8d9 8034 	ldr.w	r8, [r9, #52]	; 0x34\n",
   " 220:	4770      	bx	lr\n",
   " 222:	4660      	mov	r0, ip\n",
-  " 224:	f8d9 c2d0 	ldr.w	ip, [r9, #720]	; 0x2d0\n",
+  " 224:	f8d9 c2d4 	ldr.w	ip, [r9, #724]	; 0x2d4\n",
   " 228:	47e0      	blx	ip\n",
   nullptr
 };
diff --git a/dex2oat/linker/oat_writer_test.cc b/dex2oat/linker/oat_writer_test.cc
index 7aa1ebb..f837051 100644
--- a/dex2oat/linker/oat_writer_test.cc
+++ b/dex2oat/linker/oat_writer_test.cc
@@ -476,7 +476,7 @@
   EXPECT_EQ(76U, sizeof(OatHeader));
   EXPECT_EQ(4U, sizeof(OatMethodOffsets));
   EXPECT_EQ(24U, sizeof(OatQuickMethodHeader));
-  EXPECT_EQ(165 * static_cast<size_t>(GetInstructionSetPointerSize(kRuntimeISA)),
+  EXPECT_EQ(166 * static_cast<size_t>(GetInstructionSetPointerSize(kRuntimeISA)),
             sizeof(QuickEntryPoints));
 }
 
diff --git a/runtime/arch/arm/quick_entrypoints_arm.S b/runtime/arch/arm/quick_entrypoints_arm.S
index ccff9f6..8c83980 100644
--- a/runtime/arch/arm/quick_entrypoints_arm.S
+++ b/runtime/arch/arm/quick_entrypoints_arm.S
@@ -1152,6 +1152,7 @@
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_region_tlab, RegionTLAB)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_region_tlab, RegionTLAB)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_region_tlab, RegionTLAB)
@@ -1164,6 +1165,7 @@
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_tlab, TLAB)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_tlab, TLAB)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_tlab, TLAB)
diff --git a/runtime/arch/arm64/quick_entrypoints_arm64.S b/runtime/arch/arm64/quick_entrypoints_arm64.S
index 80d5fce..6b0de48 100644
--- a/runtime/arch/arm64/quick_entrypoints_arm64.S
+++ b/runtime/arch/arm64/quick_entrypoints_arm64.S
@@ -1604,6 +1604,7 @@
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_region_tlab, RegionTLAB)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_region_tlab, RegionTLAB)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_region_tlab, RegionTLAB)
@@ -1616,6 +1617,7 @@
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_tlab, TLAB)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_tlab, TLAB)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_tlab, TLAB)
diff --git a/runtime/arch/mips/quick_entrypoints_mips.S b/runtime/arch/mips/quick_entrypoints_mips.S
index 508a201..303333c 100644
--- a/runtime/arch/mips/quick_entrypoints_mips.S
+++ b/runtime/arch/mips/quick_entrypoints_mips.S
@@ -1724,6 +1724,7 @@
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_region_tlab, RegionTLAB)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_region_tlab, RegionTLAB)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_region_tlab, RegionTLAB)
@@ -1736,6 +1737,7 @@
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_tlab, TLAB)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_tlab, TLAB)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_tlab, TLAB)
diff --git a/runtime/arch/mips64/quick_entrypoints_mips64.S b/runtime/arch/mips64/quick_entrypoints_mips64.S
index 258acdd..f35cb16 100644
--- a/runtime/arch/mips64/quick_entrypoints_mips64.S
+++ b/runtime/arch/mips64/quick_entrypoints_mips64.S
@@ -1648,6 +1648,7 @@
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_region_tlab, RegionTLAB)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_region_tlab, RegionTLAB)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_region_tlab, RegionTLAB)
@@ -1660,6 +1661,7 @@
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_tlab, TLAB)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_tlab, TLAB)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_tlab, TLAB)
diff --git a/runtime/arch/quick_alloc_entrypoints.S b/runtime/arch/quick_alloc_entrypoints.S
index c091b0e..32888ed 100644
--- a/runtime/arch/quick_alloc_entrypoints.S
+++ b/runtime/arch/quick_alloc_entrypoints.S
@@ -22,6 +22,8 @@
 // Called by managed code to allocate an object when the caller doesn't know whether it has access
 // to the created type.
 ONE_ARG_DOWNCALL art_quick_alloc_object_with_checks\c_suffix, artAllocObjectFromCodeWithChecks\cxx_suffix, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
+// Called by managed code to allocate a string if it could not be removed by any optimizations
+ONE_ARG_DOWNCALL art_quick_alloc_string_object\c_suffix, artAllocStringObject\cxx_suffix, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
 // Called by managed code to allocate an array of a resolve class.
 TWO_ARG_DOWNCALL art_quick_alloc_array_resolved\c_suffix, artAllocArrayFromCodeResolved\cxx_suffix, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
 // Called by managed code to allocate a string from bytes
@@ -61,6 +63,8 @@
   ONE_ARG_DOWNCALL art_quick_alloc_object_initialized ## c_suffix, artAllocObjectFromCodeInitialized ## cxx_suffix, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
 #define GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(c_suffix, cxx_suffix) \
   ONE_ARG_DOWNCALL art_quick_alloc_object_with_checks ## c_suffix, artAllocObjectFromCodeWithChecks ## cxx_suffix, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
+#define GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(c_suffix, cxx_suffix) \
+  ONE_ARG_DOWNCALL art_quick_alloc_string_object ## c_suffix, artAllocStringObject ## cxx_suffix, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
 #define GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_FROM_BYTES(c_suffix, cxx_suffix) \
   FOUR_ARG_DOWNCALL art_quick_alloc_string_from_bytes ## c_suffix, artAllocStringFromBytesFromCode ## cxx_suffix, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
 #define GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_FROM_CHARS(c_suffix, cxx_suffix) \
@@ -83,6 +87,7 @@
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_region_tlab, RegionTLAB)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_region_tlab, RegionTLAB)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_region_tlab, RegionTLAB)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_region_tlab, RegionTLAB)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_region_tlab, RegionTLAB)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_region_tlab, RegionTLAB)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_region_tlab, RegionTLAB)
@@ -98,6 +103,7 @@
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_tlab, TLAB)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_tlab, TLAB)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_tlab, TLAB)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_tlab, TLAB)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_tlab, TLAB)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_tlab, TLAB)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_tlab, TLAB)
@@ -117,6 +123,7 @@
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_dlmalloc, DlMalloc)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_dlmalloc, DlMalloc)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_dlmalloc, DlMalloc)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_dlmalloc, DlMalloc)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_dlmalloc, DlMalloc)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_dlmalloc, DlMalloc)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_dlmalloc, DlMalloc)
@@ -129,6 +136,7 @@
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_dlmalloc_instrumented, DlMallocInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_dlmalloc_instrumented, DlMallocInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_dlmalloc_instrumented, DlMallocInstrumented)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_dlmalloc_instrumented, DlMallocInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_dlmalloc_instrumented, DlMallocInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_dlmalloc_instrumented, DlMallocInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_dlmalloc_instrumented, DlMallocInstrumented)
@@ -142,6 +150,7 @@
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_rosalloc, RosAlloc)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_rosalloc, RosAlloc)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_rosalloc, RosAlloc)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_rosalloc, RosAlloc)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_rosalloc, RosAlloc)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_rosalloc, RosAlloc)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_rosalloc, RosAlloc)
@@ -154,6 +163,7 @@
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_rosalloc_instrumented, RosAllocInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_rosalloc_instrumented, RosAllocInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_rosalloc_instrumented, RosAllocInstrumented)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_rosalloc_instrumented, RosAllocInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_rosalloc_instrumented, RosAllocInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_rosalloc_instrumented, RosAllocInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_rosalloc_instrumented, RosAllocInstrumented)
@@ -166,6 +176,7 @@
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_bump_pointer, BumpPointer)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_bump_pointer, BumpPointer)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_bump_pointer, BumpPointer)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_bump_pointer, BumpPointer)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_bump_pointer, BumpPointer)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_bump_pointer, BumpPointer)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_bump_pointer, BumpPointer)
@@ -178,6 +189,7 @@
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_bump_pointer_instrumented, BumpPointerInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_bump_pointer_instrumented, BumpPointerInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_bump_pointer_instrumented, BumpPointerInstrumented)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_bump_pointer_instrumented, BumpPointerInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_bump_pointer_instrumented, BumpPointerInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_bump_pointer_instrumented, BumpPointerInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_bump_pointer_instrumented, BumpPointerInstrumented)
@@ -190,6 +202,7 @@
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_tlab_instrumented, TLABInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_tlab_instrumented, TLABInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_tlab_instrumented, TLABInstrumented)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_tlab_instrumented, TLABInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_tlab_instrumented, TLABInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_tlab_instrumented, TLABInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_tlab_instrumented, TLABInstrumented)
@@ -202,6 +215,7 @@
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_region, Region)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_region, Region)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_region, Region)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_region, Region)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_region, Region)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_region, Region)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_region, Region)
@@ -214,6 +228,7 @@
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_region_instrumented, RegionInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_region_instrumented, RegionInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_region_instrumented, RegionInstrumented)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_region_instrumented, RegionInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_region_instrumented, RegionInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_region_instrumented, RegionInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_region_instrumented, RegionInstrumented)
@@ -226,6 +241,7 @@
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_region_tlab_instrumented, RegionTLABInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_region_tlab_instrumented, RegionTLABInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_region_tlab_instrumented, RegionTLABInstrumented)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_region_tlab_instrumented, RegionTLABInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_region_tlab_instrumented, RegionTLABInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_region_tlab_instrumented, RegionTLABInstrumented)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_region_tlab_instrumented, RegionTLABInstrumented)
diff --git a/runtime/arch/x86/quick_entrypoints_x86.S b/runtime/arch/x86/quick_entrypoints_x86.S
index e1b3df8..9fe41ca 100644
--- a/runtime/arch/x86/quick_entrypoints_x86.S
+++ b/runtime/arch/x86/quick_entrypoints_x86.S
@@ -987,6 +987,7 @@
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_region_tlab, RegionTLAB)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_region_tlab, RegionTLAB)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_region_tlab, RegionTLAB)
@@ -999,6 +1000,7 @@
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_tlab, TLAB)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_tlab, TLAB)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_tlab, TLAB)
diff --git a/runtime/arch/x86_64/quick_entrypoints_x86_64.S b/runtime/arch/x86_64/quick_entrypoints_x86_64.S
index 9980966..c41d3e4 100644
--- a/runtime/arch/x86_64/quick_entrypoints_x86_64.S
+++ b/runtime/arch/x86_64/quick_entrypoints_x86_64.S
@@ -1011,6 +1011,7 @@
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_region_tlab, RegionTLAB)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_region_tlab, RegionTLAB)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_region_tlab, RegionTLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_region_tlab, RegionTLAB)
@@ -1023,6 +1024,7 @@
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_tlab, TLAB)
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_tlab, TLAB)
+GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_tlab, TLAB)
 // GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_tlab, TLAB)
diff --git a/runtime/asm_support.h b/runtime/asm_support.h
index ffbff88..e65c194 100644
--- a/runtime/asm_support.h
+++ b/runtime/asm_support.h
@@ -73,7 +73,7 @@
 
 // Offset of field Thread::tlsPtr_.mterp_current_ibase.
 #define THREAD_CURRENT_IBASE_OFFSET \
-    (THREAD_LOCAL_OBJECTS_OFFSET + __SIZEOF_SIZE_T__ + (1 + 165) * __SIZEOF_POINTER__)
+    (THREAD_LOCAL_OBJECTS_OFFSET + __SIZEOF_SIZE_T__ + (1 + 166) * __SIZEOF_POINTER__)
 ADD_TEST_EQ(THREAD_CURRENT_IBASE_OFFSET,
             art::Thread::MterpCurrentIBaseOffset<POINTER_SIZE>().Int32Value())
 // Offset of field Thread::tlsPtr_.mterp_default_ibase.
diff --git a/runtime/entrypoints/quick/quick_alloc_entrypoints.cc b/runtime/entrypoints/quick/quick_alloc_entrypoints.cc
index 5f7594c..257cd41 100644
--- a/runtime/entrypoints/quick/quick_alloc_entrypoints.cc
+++ b/runtime/entrypoints/quick/quick_alloc_entrypoints.cc
@@ -84,6 +84,13 @@
     REQUIRES_SHARED(Locks::mutator_lock_) { \
   return artAllocObjectFromCode<true, false, instrumented_bool, allocator_type>(klass, self); \
 } \
+extern "C" mirror::String* artAllocStringObject##suffix##suffix2( \
+    mirror::Class* klass, Thread* self) \
+    REQUIRES_SHARED(Locks::mutator_lock_) { \
+  /* The klass arg is so it matches the ABI of the other object alloc callbacks. */ \
+  DCHECK(klass->IsStringClass()) << klass->PrettyClass(); \
+  return mirror::String::AllocEmptyString<instrumented_bool>(self, allocator_type); \
+} \
 extern "C" mirror::Array* artAllocArrayFromCodeResolved##suffix##suffix2( \
     mirror::Class* klass, int32_t component_count, Thread* self) \
     REQUIRES_SHARED(Locks::mutator_lock_) { \
@@ -138,6 +145,7 @@
 extern "C" void* art_quick_alloc_object_resolved##suffix(mirror::Class* klass); \
 extern "C" void* art_quick_alloc_object_initialized##suffix(mirror::Class* klass); \
 extern "C" void* art_quick_alloc_object_with_checks##suffix(mirror::Class* klass); \
+extern "C" void* art_quick_alloc_string_object##suffix(mirror::Class* klass); \
 extern "C" void* art_quick_alloc_string_from_bytes##suffix(void*, int32_t, int32_t, int32_t); \
 extern "C" void* art_quick_alloc_string_from_chars##suffix(int32_t, int32_t, void*); \
 extern "C" void* art_quick_alloc_string_from_string##suffix(void*); \
@@ -149,6 +157,7 @@
 extern "C" void* art_quick_alloc_object_resolved##suffix##_instrumented(mirror::Class* klass); \
 extern "C" void* art_quick_alloc_object_initialized##suffix##_instrumented(mirror::Class* klass); \
 extern "C" void* art_quick_alloc_object_with_checks##suffix##_instrumented(mirror::Class* klass); \
+extern "C" void* art_quick_alloc_string_object##suffix##_instrumented(mirror::Class* klass); \
 extern "C" void* art_quick_alloc_string_from_bytes##suffix##_instrumented(void*, int32_t, int32_t, int32_t); \
 extern "C" void* art_quick_alloc_string_from_chars##suffix##_instrumented(int32_t, int32_t, void*); \
 extern "C" void* art_quick_alloc_string_from_string##suffix##_instrumented(void*); \
@@ -162,6 +171,7 @@
     qpoints->pAllocObjectResolved = art_quick_alloc_object_resolved##suffix##_instrumented; \
     qpoints->pAllocObjectInitialized = art_quick_alloc_object_initialized##suffix##_instrumented; \
     qpoints->pAllocObjectWithChecks = art_quick_alloc_object_with_checks##suffix##_instrumented; \
+    qpoints->pAllocStringObject = art_quick_alloc_string_object##suffix##_instrumented; \
     qpoints->pAllocStringFromBytes = art_quick_alloc_string_from_bytes##suffix##_instrumented; \
     qpoints->pAllocStringFromChars = art_quick_alloc_string_from_chars##suffix##_instrumented; \
     qpoints->pAllocStringFromString = art_quick_alloc_string_from_string##suffix##_instrumented; \
@@ -174,6 +184,7 @@
     qpoints->pAllocObjectResolved = art_quick_alloc_object_resolved##suffix; \
     qpoints->pAllocObjectInitialized = art_quick_alloc_object_initialized##suffix; \
     qpoints->pAllocObjectWithChecks = art_quick_alloc_object_with_checks##suffix; \
+    qpoints->pAllocStringObject = art_quick_alloc_string_object##suffix; \
     qpoints->pAllocStringFromBytes = art_quick_alloc_string_from_bytes##suffix; \
     qpoints->pAllocStringFromChars = art_quick_alloc_string_from_chars##suffix; \
     qpoints->pAllocStringFromString = art_quick_alloc_string_from_string##suffix; \
diff --git a/runtime/entrypoints/quick/quick_entrypoints_list.h b/runtime/entrypoints/quick/quick_entrypoints_list.h
index 415a158..4ce954c 100644
--- a/runtime/entrypoints/quick/quick_entrypoints_list.h
+++ b/runtime/entrypoints/quick/quick_entrypoints_list.h
@@ -28,6 +28,9 @@
   V(AllocObjectResolved, void*, mirror::Class*) \
   V(AllocObjectInitialized, void*, mirror::Class*) \
   V(AllocObjectWithChecks, void*, mirror::Class*) \
+  /* NB Class argument is purely to match the ABI of the other object alloc entrypoints. It is */ \
+  /*    not actually used for anything. */ \
+  V(AllocStringObject, void*, mirror::Class*) \
   V(AllocStringFromBytes, void*, void*, int32_t, int32_t, int32_t) \
   V(AllocStringFromChars, void*, int32_t, int32_t, void*) \
   V(AllocStringFromString, void*, void*) \
diff --git a/runtime/entrypoints_order_test.cc b/runtime/entrypoints_order_test.cc
index dda3dde..c3cd793 100644
--- a/runtime/entrypoints_order_test.cc
+++ b/runtime/entrypoints_order_test.cc
@@ -168,7 +168,9 @@
                          sizeof(void*));
     EXPECT_OFFSET_DIFFNP(QuickEntryPoints, pAllocObjectInitialized, pAllocObjectWithChecks,
                          sizeof(void*));
-    EXPECT_OFFSET_DIFFNP(QuickEntryPoints, pAllocObjectWithChecks, pAllocStringFromBytes,
+    EXPECT_OFFSET_DIFFNP(QuickEntryPoints, pAllocObjectWithChecks, pAllocStringObject,
+                         sizeof(void*));
+    EXPECT_OFFSET_DIFFNP(QuickEntryPoints, pAllocStringObject, pAllocStringFromBytes,
                          sizeof(void*));
     EXPECT_OFFSET_DIFFNP(QuickEntryPoints, pAllocStringFromBytes, pAllocStringFromChars,
                          sizeof(void*));
diff --git a/runtime/oat.h b/runtime/oat.h
index 01ef424..ef2a5d7 100644
--- a/runtime/oat.h
+++ b/runtime/oat.h
@@ -32,8 +32,8 @@
 class PACKED(4) OatHeader {
  public:
   static constexpr uint8_t kOatMagic[] = { 'o', 'a', 't', '\n' };
-  // Last oat version changed reason: Add CodeInfo for JNI methods.
-  static constexpr uint8_t kOatVersion[] = { '1', '5', '2', '\0' };
+  // Last oat version changed reason: Added AllocStringObject Quick Entrypoint.
+  static constexpr uint8_t kOatVersion[] = { '1', '5', '3', '\0' };
 
   static constexpr const char* kImageLocationKey = "image-location";
   static constexpr const char* kDex2OatCmdLineKey = "dex2oat-cmdline";
diff --git a/runtime/thread.cc b/runtime/thread.cc
index 5fb6e79..99a8829 100644
--- a/runtime/thread.cc
+++ b/runtime/thread.cc
@@ -3160,6 +3160,7 @@
   QUICK_ENTRY_POINT_INFO(pAllocObjectResolved)
   QUICK_ENTRY_POINT_INFO(pAllocObjectInitialized)
   QUICK_ENTRY_POINT_INFO(pAllocObjectWithChecks)
+  QUICK_ENTRY_POINT_INFO(pAllocStringObject)
   QUICK_ENTRY_POINT_INFO(pAllocStringFromBytes)
   QUICK_ENTRY_POINT_INFO(pAllocStringFromChars)
   QUICK_ENTRY_POINT_INFO(pAllocStringFromString)