[cleanup] Move Code class out of objects.cc

Drive-by: Refactor FlushInstructionCache to its own header. This removes
dependencies of objects.cc and code.cc

Bug: v8:8562
Change-Id: If23f3b9d4f2068e08c61c0f4b070ecfe1b9a6cc0
Reviewed-on: https://chromium-review.googlesource.com/c/1456081Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59435}

BUILD.gn

@@ -1973,6 +1973,8 @@ v8_source_set("v8_base") {
     "src/flag-definitions.h",
     "src/flags.cc",
     "src/flags.h",
+    "src/flush-instruction-cache.cc",
+    "src/flush-instruction-cache.h",
     "src/frame-constants.h",
     "src/frames-inl.h",
     "src/frames.cc",
@@ -2189,6 +2191,7 @@ v8_source_set("v8_base") {
     "src/objects/cell-inl.h",
     "src/objects/cell.h",
     "src/objects/code-inl.h",
+    "src/objects/code.cc",
     "src/objects/code.h",
     "src/objects/compilation-cache-inl.h",
     "src/objects/compilation-cache.h",

src/arm/assembler-arm-inl.h

@@ -348,7 +348,7 @@ void Assembler::set_target_address_at(Address pc, Address constant_pool,
     Memory<Address>(constant_pool_entry_address(pc, constant_pool)) = target;
     // Intuitively, we would think it is necessary to always flush the
     // instruction cache after patching a target address in the code as follows:
-    //   Assembler::FlushICache(pc, sizeof(target));
+    //   FlushInstructionCache(pc, sizeof(target));
     // However, on ARM, no instruction is actually patched in the case
     // of embedded constants of the form:
     // ldr   ip, [pp, #...]
@@ -366,7 +366,7 @@ void Assembler::set_target_address_at(Address pc, Address constant_pool,
     DCHECK(IsMovW(Memory<int32_t>(pc)));
     DCHECK(IsMovT(Memory<int32_t>(pc + kInstrSize)));
     if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
-      Assembler::FlushICache(pc, 2 * kInstrSize);
+      FlushInstructionCache(pc, 2 * kInstrSize);
     }
   } else if (IsMovImmed(Memory<int32_t>(pc))) {
     // This is an mov / orr immediate load. Patch the immediate embedded in
@@ -386,14 +386,14 @@ void Assembler::set_target_address_at(Address pc, Address constant_pool,
            IsOrrImmed(Memory<int32_t>(pc + 2 * kInstrSize)) &&
            IsOrrImmed(Memory<int32_t>(pc + 3 * kInstrSize)));
     if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
-      Assembler::FlushICache(pc, 4 * kInstrSize);
+      FlushInstructionCache(pc, 4 * kInstrSize);
     }
   } else {
     intptr_t branch_offset = target - pc - Instruction::kPcLoadDelta;
     Instruction* branch = Instruction::At(pc);
     branch->SetBranchOffset(branch_offset);
     if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
-      Assembler::FlushICache(pc, kInstrSize);
+      FlushInstructionCache(pc, kInstrSize);
     }
   }
 }

src/arm64/assembler-arm64-inl.h

@@ -598,7 +598,7 @@ void Assembler::deserialization_set_special_target_at(Address location,
       target = location;
     }
     instr->SetBranchImmTarget(reinterpret_cast<Instruction*>(target));
-    Assembler::FlushICache(location, kInstrSize);
+    FlushInstructionCache(location, kInstrSize);
   } else {
     DCHECK_EQ(instr->InstructionBits(), 0);
     Memory<Address>(location) = target;
@@ -635,7 +635,7 @@ void Assembler::set_target_address_at(Address pc, Address constant_pool,
     }
     instr->SetBranchImmTarget(reinterpret_cast<Instruction*>(target));
     if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
-      Assembler::FlushICache(pc, kInstrSize);
+      FlushInstructionCache(pc, kInstrSize);
     }
   }
 }

src/assembler.cc

@@ -39,7 +39,6 @@
 #include "src/disassembler.h"
 #include "src/isolate.h"
 #include "src/ostreams.h"
-#include "src/simulator.h"  // For flushing instruction cache.
 #include "src/snapshot/embedded-data.h"
 #include "src/snapshot/serializer-common.h"
 #include "src/snapshot/snapshot.h"
@@ -161,17 +160,6 @@ AssemblerBase::AssemblerBase(const AssemblerOptions& options,
 
 AssemblerBase::~AssemblerBase() = default;
 
-void AssemblerBase::FlushICache(void* start, size_t size) {
-  if (size == 0) return;
-
-#if defined(USE_SIMULATOR)
-  base::MutexGuard lock_guard(Simulator::i_cache_mutex());
-  Simulator::FlushICache(Simulator::i_cache(), start, size);
-#else
-  CpuFeatures::FlushICache(start, size);
-#endif  // USE_SIMULATOR
-}
-
 void AssemblerBase::Print(Isolate* isolate) {
   StdoutStream os;
   v8::internal::Disassembler::Decode(isolate, &os, buffer_start_, pc_);

src/assembler.h

@@ -268,11 +268,6 @@ class V8_EXPORT_PRIVATE AssemblerBase : public Malloced {
 
   static const int kMinimalBufferSize = 4*KB;
 
-  static void FlushICache(void* start, size_t size);
-  static void FlushICache(Address start, size_t size) {
-    return FlushICache(reinterpret_cast<void*>(start), size);
-  }
-
  protected:
   // Add 'target' to the {code_targets_} vector, if necessary, and return the
   // offset at which it is stored.

src/builtins/setup-builtins-internal.cc

@@ -268,7 +268,7 @@ void SetupIsolateDelegate::ReplacePlaceholders(Isolate* isolate) {
       flush_icache = true;
     }
     if (flush_icache) {
-      Assembler::FlushICache(code->raw_instruction_start(),
+      FlushInstructionCache(code->raw_instruction_start(),
                             code->raw_instruction_size());
     }
   }

src/cpu-features.h

@@ -104,8 +104,8 @@ class CpuFeatures : public AllStatic {
   static void PrintFeatures();
 
  private:
+  friend void V8_EXPORT_PRIVATE FlushInstructionCache(void*, size_t);
   friend class ExternalReference;
-  friend class AssemblerBase;
   // Flush instruction cache.
   static void FlushICache(void* start, size_t size);
 

src/flush-instruction-cache.cc

+// Copyright 2019 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/flush-instruction-cache.h"
+
+#include "src/base/platform/mutex.h"
+#include "src/cpu-features.h"
+#include "src/simulator.h"
+
+namespace v8 {
+namespace internal {
+
+void FlushInstructionCache(void* start, size_t size) {
+  if (size == 0) return;
+
+#if defined(USE_SIMULATOR)
+  base::MutexGuard lock_guard(Simulator::i_cache_mutex());
+  Simulator::FlushICache(Simulator::i_cache(), start, size);
+#else
+  CpuFeatures::FlushICache(start, size);
+#endif  // USE_SIMULATOR
+}
+
+}  // namespace internal
+}  // namespace v8

src/flush-instruction-cache.h

+// Copyright 2019 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_FLUSH_INSTRUCTION_CACHE_H_
+#define V8_FLUSH_INSTRUCTION_CACHE_H_
+
+#include "include/v8-internal.h"
+#include "src/base/macros.h"
+
+namespace v8 {
+namespace internal {
+
+V8_EXPORT_PRIVATE void FlushInstructionCache(void* start, size_t size);
+V8_EXPORT_PRIVATE V8_INLINE void FlushInstructionCache(Address start,
+                                                       size_t size) {
+  return FlushInstructionCache(reinterpret_cast<void*>(start), size);
+}
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_FLUSH_INSTRUCTION_CACHE_H_

src/ia32/assembler-ia32-inl.h

@@ -105,7 +105,7 @@ void RelocInfo::set_target_object(Heap* heap, HeapObject target,
   DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
   WriteUnalignedValue(pc_, target->ptr());
   if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
-    Assembler::FlushICache(pc_, sizeof(Address));
+    FlushInstructionCache(pc_, sizeof(Address));
   }
   if (write_barrier_mode == UPDATE_WRITE_BARRIER && !host().is_null()) {
     WriteBarrierForCode(host(), this, target);
@@ -122,7 +122,7 @@ void RelocInfo::set_target_external_reference(
   DCHECK(rmode_ == RelocInfo::EXTERNAL_REFERENCE);
   WriteUnalignedValue(pc_, target);
   if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
-    Assembler::FlushICache(pc_, sizeof(Address));
+    FlushInstructionCache(pc_, sizeof(Address));
   }
 }
 
@@ -246,7 +246,7 @@ void Assembler::set_target_address_at(Address pc, Address constant_pool,
                                       ICacheFlushMode icache_flush_mode) {
   WriteUnalignedValue(pc, target - (pc + sizeof(int32_t)));
   if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
-    Assembler::FlushICache(pc, sizeof(int32_t));
+    FlushInstructionCache(pc, sizeof(int32_t));
   }
 }
 

src/mips/assembler-mips.cc

@@ -4114,7 +4114,7 @@ void Assembler::set_target_value_at(Address pc, uint32_t target,
   }
 
   if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
-    Assembler::FlushICache(pc, 2 * sizeof(int32_t));
+    FlushInstructionCache(pc, 2 * sizeof(int32_t));
   }
 }
 

src/mips64/assembler-mips64.cc

@@ -4352,7 +4352,7 @@ void Assembler::set_target_value_at(Address pc, uint64_t target,
              (target & kImm16Mask);
 
   if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
-    Assembler::FlushICache(pc, 4 * kInstrSize);
+    FlushInstructionCache(pc, 4 * kInstrSize);
   }
 }
 

src/ppc/assembler-ppc-inl.h

@@ -469,7 +469,7 @@ void Assembler::set_target_address_at(Address pc, Address constant_pool,
     *(p + 3) = instr4;
     *(p + 4) = instr5;
     if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
-      Assembler::FlushICache(p, 5 * kInstrSize);
+      FlushInstructionCache(p, 5 * kInstrSize);
     }
 #else
     uint32_t* p = reinterpret_cast<uint32_t*>(pc);
@@ -484,7 +484,7 @@ void Assembler::set_target_address_at(Address pc, Address constant_pool,
     *p = instr1;
     *(p + 1) = instr2;
     if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
-      Assembler::FlushICache(p, 2 * kInstrSize);
+      FlushInstructionCache(p, 2 * kInstrSize);
     }
 #endif
     return;

src/reloc-info.h

@@ -5,8 +5,8 @@
 #ifndef V8_RELOC_INFO_H_
 #define V8_RELOC_INFO_H_
 
+#include "src/flush-instruction-cache.h"
 #include "src/globals.h"
-#include "src/objects.h"
 #include "src/objects/code.h"
 
 namespace v8 {

src/s390/assembler-s390-inl.h

@@ -297,7 +297,7 @@ void Assembler::set_target_address_at(Address pc, Address constant_pool,
     Instruction::SetInstructionBits<SixByteInstr>(reinterpret_cast<byte*>(pc),
                                                   instr_1);
     if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
-      Assembler::FlushICache(pc, 6);
+      FlushInstructionCache(pc, 6);
     }
     patched = true;
   } else {
@@ -326,7 +326,7 @@ void Assembler::set_target_address_at(Address pc, Address constant_pool,
       Instruction::SetInstructionBits<SixByteInstr>(
           reinterpret_cast<byte*>(pc + instr1_length), instr_2);
       if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
-        Assembler::FlushICache(pc, 12);
+        FlushInstructionCache(pc, 12);
       }
       patched = true;
     }
@@ -340,7 +340,7 @@ void Assembler::set_target_address_at(Address pc, Address constant_pool,
       Instruction::SetInstructionBits<SixByteInstr>(reinterpret_cast<byte*>(pc),
                                                     instr_1);
       if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
-        Assembler::FlushICache(pc, 6);
+        FlushInstructionCache(pc, 6);
       }
       patched = true;
     }

src/snapshot/object-deserializer.cc

@@ -59,7 +59,7 @@ void ObjectDeserializer::FlushICache() {
   for (Code code : new_code_objects()) {
     // Record all references to embedded objects in the new code object.
     WriteBarrierForCode(code);
-    Assembler::FlushICache(code->raw_instruction_start(),
+    FlushInstructionCache(code->raw_instruction_start(),
                           code->raw_instruction_size());
   }
 }

src/snapshot/startup-deserializer.cc

@@ -78,7 +78,7 @@ void StartupDeserializer::FlushICache() {
   DCHECK(!deserializing_user_code());
   // The entire isolate is newly deserialized. Simply flush all code pages.
   for (Page* p : *isolate()->heap()->code_space()) {
-    Assembler::FlushICache(p->area_start(), p->area_end() - p->area_start());
+    FlushInstructionCache(p->area_start(), p->area_end() - p->area_start());
   }
 }
 

src/v8.cc

@@ -21,7 +21,6 @@
 #include "src/libsampler/sampler.h"
 #include "src/objects-inl.h"
 #include "src/profiler/heap-profiler.h"
-#include "src/reloc-info.h"
 #include "src/runtime-profiler.h"
 #include "src/simulator.h"
 #include "src/snapshot/natives.h"

src/visitors.cc

@@ -4,7 +4,7 @@
 
 #include "src/visitors.h"
 
-#include "src/objects/code.h"
+#include "src/reloc-info.h"
 
 namespace v8 {
 namespace internal {
@@ -23,5 +23,11 @@ const char* RootVisitor::RootName(Root root) {
   return nullptr;
 }
 
+void ObjectVisitor::VisitRelocInfo(RelocIterator* it) {
+  for (; !it->done(); it->next()) {
+    it->rinfo()->Visit(this);
+  }
+}
+
 }  // namespace internal
 }  // namespace v8

src/wasm/jump-table-assembler.h

@@ -64,7 +64,7 @@ class JumpTableAssembler : public TurboAssembler {
     jtasm.EmitLazyCompileJumpSlot(func_index, lazy_compile_target);
     jtasm.NopBytes(kJumpTableSlotSize - jtasm.pc_offset());
     if (flush_i_cache) {
-      Assembler::FlushICache(slot, kJumpTableSlotSize);
+      FlushInstructionCache(slot, kJumpTableSlotSize);
     }
   }
 
@@ -76,7 +76,7 @@ class JumpTableAssembler : public TurboAssembler {
     jtasm.EmitJumpSlot(new_target);
     jtasm.NopBytes(kJumpTableSlotSize - jtasm.pc_offset());
     if (flush_i_cache) {
-      Assembler::FlushICache(slot, kJumpTableSlotSize);
+      FlushInstructionCache(slot, kJumpTableSlotSize);
     }
   }
 

src/wasm/wasm-code-manager.cc

@@ -503,7 +503,7 @@ void NativeModule::SetLazyBuiltin(Handle<Code> code) {
         i + module_->num_imported_functions, lazy_compile_target,
         WasmCode::kNoFlushICache);
   }
-  Assembler::FlushICache(jump_table_->instructions().start(),
+  FlushInstructionCache(jump_table_->instructions().start(),
                         jump_table_->instructions().size());
 }
 
@@ -591,7 +591,7 @@ WasmCode* NativeModule::AddAnonymousCode(Handle<Code> code, WasmCode::Kind kind,
 
   // Flush the i-cache here instead of in AddOwnedCode, to include the changes
   // made while iterating over the RelocInfo above.
-  Assembler::FlushICache(ret->instructions().start(),
+  FlushInstructionCache(ret->instructions().start(),
                         ret->instructions().size());
   ret->MaybePrint(name);
   ret->Validate();
@@ -652,7 +652,7 @@ WasmCode* NativeModule::AddCode(
 
   // Flush the i-cache here instead of in AddOwnedCode, to include the changes
   // made while iterating over the RelocInfo above.
-  Assembler::FlushICache(ret->instructions().start(),
+  FlushInstructionCache(ret->instructions().start(),
                         ret->instructions().size());
   ret->MaybePrint();
   ret->Validate();

src/wasm/wasm-serialization.cc

@@ -573,7 +573,7 @@ bool NativeModuleDeserializer::ReadCode(uint32_t fn_index, Reader* reader) {
   code->Validate();
 
   // Finally, flush the icache for that code.
-  Assembler::FlushICache(code->instructions().start(),
+  FlushInstructionCache(code->instructions().start(),
                         code->instructions().size());
 
   return true;

src/x64/assembler-x64-inl.h

@@ -236,7 +236,7 @@ void Assembler::set_target_address_at(Address pc, Address constant_pool,
                                       ICacheFlushMode icache_flush_mode) {
   WriteUnalignedValue(pc, static_cast<int32_t>(target - pc - 4));
   if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
-    Assembler::FlushICache(pc, sizeof(int32_t));
+    FlushInstructionCache(pc, sizeof(int32_t));
   }
 }
 
@@ -335,7 +335,7 @@ void RelocInfo::set_target_external_reference(
   DCHECK(rmode_ == RelocInfo::EXTERNAL_REFERENCE);
   WriteUnalignedValue(pc_, target);
   if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
-    Assembler::FlushICache(pc_, sizeof(Address));
+    FlushInstructionCache(pc_, sizeof(Address));
   }
 }
 
@@ -356,7 +356,7 @@ void RelocInfo::set_target_object(Heap* heap, HeapObject target,
   DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
   WriteUnalignedValue(pc_, target->ptr());
   if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
-    Assembler::FlushICache(pc_, sizeof(Address));
+    FlushInstructionCache(pc_, sizeof(Address));
   }
   if (write_barrier_mode == UPDATE_WRITE_BARRIER && !host().is_null()) {
     WriteBarrierForCode(host(), this, target);

test/cctest/test-icache.cc

@@ -104,14 +104,14 @@ TEST(TestFlushICacheOfWritable) {
     CHECK(SetPermissions(GetPlatformPageAllocator(), buffer->start(),
                          buffer->size(), v8::PageAllocator::kReadWrite));
     FloodWithInc(isolate, buffer.get());
-    Assembler::FlushICache(buffer->start(), buffer->size());
+    FlushInstructionCache(buffer->start(), buffer->size());
     CHECK(SetPermissions(GetPlatformPageAllocator(), buffer->start(),
                          buffer->size(), v8::PageAllocator::kReadExecute));
     CHECK_EQ(23 + kNumInstr, f.Call(23));  // Call into generated code.
     CHECK(SetPermissions(GetPlatformPageAllocator(), buffer->start(),
                          buffer->size(), v8::PageAllocator::kReadWrite));
     FloodWithNop(isolate, buffer.get());
-    Assembler::FlushICache(buffer->start(), buffer->size());
+    FlushInstructionCache(buffer->start(), buffer->size());
     CHECK(SetPermissions(GetPlatformPageAllocator(), buffer->start(),
                          buffer->size(), v8::PageAllocator::kReadExecute));
     CHECK_EQ(23, f.Call(23));  // Call into generated code.
@@ -151,14 +151,14 @@ CONDITIONAL_TEST(TestFlushICacheOfExecutable) {
     FloodWithInc(isolate, buffer.get());
     CHECK(SetPermissions(GetPlatformPageAllocator(), buffer->start(),
                          buffer->size(), v8::PageAllocator::kReadExecute));
-    Assembler::FlushICache(buffer->start(), buffer->size());
+    FlushInstructionCache(buffer->start(), buffer->size());
     CHECK_EQ(23 + kNumInstr, f.Call(23));  // Call into generated code.
     CHECK(SetPermissions(GetPlatformPageAllocator(), buffer->start(),
                          buffer->size(), v8::PageAllocator::kReadWrite));
     FloodWithNop(isolate, buffer.get());
     CHECK(SetPermissions(GetPlatformPageAllocator(), buffer->start(),
                          buffer->size(), v8::PageAllocator::kReadExecute));
-    Assembler::FlushICache(buffer->start(), buffer->size());
+    FlushInstructionCache(buffer->start(), buffer->size());
     CHECK_EQ(23, f.Call(23));  // Call into generated code.
   }
 }
@@ -180,10 +180,10 @@ TEST(TestFlushICacheOfWritableAndExecutable) {
     CHECK(SetPermissions(GetPlatformPageAllocator(), buffer->start(),
                          buffer->size(), v8::PageAllocator::kReadWriteExecute));
     FloodWithInc(isolate, buffer.get());
-    Assembler::FlushICache(buffer->start(), buffer->size());
+    FlushInstructionCache(buffer->start(), buffer->size());
     CHECK_EQ(23 + kNumInstr, f.Call(23));  // Call into generated code.
     FloodWithNop(isolate, buffer.get());
-    Assembler::FlushICache(buffer->start(), buffer->size());
+    FlushInstructionCache(buffer->start(), buffer->size());
     CHECK_EQ(23, f.Call(23));  // Call into generated code.
   }
 }

test/common/assembler-tester.h

@@ -46,7 +46,7 @@ class TestingAssemblerBuffer : public AssemblerBuffer {
     // some older ARM kernels there is a bug which causes an access error on
     // cache flush instructions to trigger access error on non-writable memory.
     // See https://bugs.chromium.org/p/v8/issues/detail?id=8157
-    Assembler::FlushICache(buffer_, size_);
+    FlushInstructionCache(buffer_, size_);
 
     bool result = SetPermissions(GetPlatformPageAllocator(), buffer_, size_,
                                  v8::PageAllocator::kReadExecute);