[wasm] Lazy compilation for asm.js

src/builtins/arm64/builtins-arm64.cc

 // Copyright 2013 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.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/arm64/frames-arm64.h"
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
@@ skipping 3146 matching lines @@
   __ Jump(code_entry);
 
   __ Bind(&stack_overflow);
   {
     FrameScope frame(masm, StackFrame::MANUAL);
     __ CallRuntime(Runtime::kThrowStackOverflow);
     __ Unreachable();
   }
 }
 
+void Builtins::Generate_WasmCompileLazy(MacroAssembler* masm) {
+  DCHECK(masm->StackPointer().is(jssp));
+  __ Move(jssp, csp);
+  {
+    FrameScope scope(masm, StackFrame::INTERNAL);
+
+    // Save all parameter registers (see wasm-linkage.cc).
+    const RegList gp_regs = x0.Bit() | x1.Bit() | x2.Bit() | x3.Bit() |
+                            x4.Bit() | x5.Bit() | x6.Bit() | x7.Bit();
+    const RegList fp_regs = d0.Bit() | d1.Bit() | d2.Bit() | d3.Bit() |
+                            d4.Bit() | d5.Bit() | d6.Bit() | d7.Bit();
+    __ PushXRegList(gp_regs);
+    __ PushDRegList(fp_regs);
+
+    // Initialize cp register with kZero, CEntryStub will use it to set the
+    // current context on the isolate.
+    __ Move(cp, Smi::kZero);
+    __ CallRuntime(Runtime::kWasmCompileLazy);
+    // Store returned instruction start in x8.
+    __ Add(x8, x0, Code::kHeaderSize - kHeapObjectTag);
+
+    // Restore registers.
+    __ PopDRegList(fp_regs);
+    __ PopXRegList(gp_regs);
+  }
+  // Now jump to the instructions of the returned code object.
+  __ Jump(x8);
+}
+
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM