Implement UnalignedLoad and UnalignedStore in WASM using LoadByte/Shift/Or and StoreByte/Shift/And.

src/compiler/wasm-compiler.h

 // Copyright 2015 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_COMPILER_WASM_COMPILER_H_
 #define V8_COMPILER_WASM_COMPILER_H_
 
 // Clients of this interface shouldn't depend on lots of compiler internals.
 // Do not include anything from src/compiler here!
 #include "src/compiler.h"
@@ skipping 144 matching lines @@
   Node* Invert(Node* node);
   Node* FunctionTable();
 
   //-----------------------------------------------------------------------
   // Operations that concern the linear memory.
   //-----------------------------------------------------------------------
   Node* MemSize(uint32_t offset);
   Node* LoadGlobal(uint32_t index);
   Node* StoreGlobal(uint32_t index, Node* val);
   Node* LoadMem(wasm::LocalType type, MachineType memtype, Node* index,
-                uint32_t offset, wasm::WasmCodePosition position);
-  Node* StoreMem(MachineType type, Node* index, uint32_t offset, Node* val,
+                uint32_t offset, uint32_t alignment,
+                wasm::WasmCodePosition position);
+  Node* StoreMem(MachineType type, Node* index, uint32_t offset,
+                 uint32_t alignment, Node* val,
                  wasm::WasmCodePosition position);
 
   static void PrintDebugName(Node* node);
 
   Node* Control() { return *control_; }
   Node* Effect() { return *effect_; }
 
   void set_module(wasm::ModuleEnv* module) { this->module_ = module; }
 
   void set_control_ptr(Node** control) { this->control_ = control; }
@@ skipping 30 matching lines @@
 
   // Internal helper methods.
   JSGraph* jsgraph() { return jsgraph_; }
   Graph* graph();
 
   Node* String(const char* string);
   Node* MemBuffer(uint32_t offset);
   void BoundsCheckMem(MachineType memtype, Node* index, uint32_t offset,
                       wasm::WasmCodePosition position);
 
+  MachineType GetTypeForUnalignedAccess(uint32_t alignment,
+                                        bool signExtend = false);
+
+  Node* GetUnalignedLoadOffsetNode(Node* baseOffset, int numberOfBytes,
+                                   int stride, int current);
+
+  Node* BuildUnalignedLoad(wasm::LocalType type, MachineType memtype,
+                           Node* index, uint32_t offset, uint32_t alignment);
+  Node* GetUnalignedStoreOffsetNode(Node* baseOffset, int numberOfBytes,
+                                    int stride, int current);
+  Node* BuildUnalignedStore(MachineType memtype, Node* index, uint32_t offset,
+                            uint32_t alignment, Node* val);
+
   Node* MaskShiftCount32(Node* node);
   Node* MaskShiftCount64(Node* node);
 
   Node* BuildCCall(MachineSignature* sig, Node** args);
   Node* BuildWasmCall(wasm::FunctionSig* sig, Node** args,
                       wasm::WasmCodePosition position);
 
   Node* BuildF32Neg(Node* input);
   Node* BuildF64Neg(Node* input);
   Node* BuildF32CopySign(Node* left, Node* right);
@@ skipping 101 matching lines @@
     Node** buf = Buffer(new_count);
     if (buf != buffer) memcpy(buf, buffer, old_count * sizeof(Node*));
     return buf;
   }
 };
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_WASM_COMPILER_H_