[wasm] Relocatable Globals

src/x64/assembler-x64.cc

 // Copyright 2012 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/x64/assembler-x64.h"
 
 #include <cstring>
 
 #if V8_TARGET_ARCH_X64
 
@@ skipping 104 matching lines @@
 }
 
 // -----------------------------------------------------------------------------
 // Implementation of RelocInfo
 
 Address RelocInfo::wasm_memory_reference() {
   DCHECK(IsWasmMemoryReference(rmode_));
   return Memory::Address_at(pc_);
 }
 
+Address RelocInfo::wasm_global_reference() {
+  DCHECK(IsWasmGlobalReference(rmode_));
+  return Memory::Address_at(pc_);
+}
+
 uint32_t RelocInfo::wasm_memory_size_reference() {
   DCHECK(IsWasmMemorySizeReference(rmode_));
   return Memory::uint32_at(pc_);
 }
 
 void RelocInfo::update_wasm_memory_reference(
     Address old_base, Address new_base, uint32_t old_size, uint32_t new_size,
     ICacheFlushMode icache_flush_mode) {
   DCHECK(IsWasmMemoryReference(rmode_) || IsWasmMemorySizeReference(rmode_));
   if (IsWasmMemoryReference(rmode_)) {
@@ skipping 12 matching lines @@
     DCHECK(updated_size_reference <= new_size);
     Memory::uint32_at(pc_) = updated_size_reference;
   } else {
     UNREACHABLE();
   }
   if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
     Assembler::FlushICache(isolate_, pc_, sizeof(int64_t));
   }
 }
 
+void RelocInfo::update_wasm_global_reference(
+    Address old_base, Address new_base, ICacheFlushMode icache_flush_mode) {
+  DCHECK(IsWasmGlobalReference(rmode_));
+  Address updated_reference;
+  DCHECK(old_base <= wasm_global_reference());
+  updated_reference = new_base + (wasm_global_reference() - old_base);
+  DCHECK(new_base <= updated_reference);
+  Memory::Address_at(pc_) = updated_reference;
+  if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
+    Assembler::FlushICache(isolate_, pc_, sizeof(int64_t));
+  }
+}
+
 // -----------------------------------------------------------------------------
 // Implementation of Operand
 
 Operand::Operand(Register base, int32_t disp) : rex_(0) {
   len_ = 1;
   if (base.is(rsp) || base.is(r12)) {
     // SIB byte is needed to encode (rsp + offset) or (r12 + offset).
     set_sib(times_1, rsp, base);
   }
 
@@ skipping 4430 matching lines @@
 
 bool RelocInfo::IsInConstantPool() {
   return false;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64