[wasm] Lazy compilation for asm.js

src/builtins/arm64/builtins-arm64.cc

Index: src/builtins/arm64/builtins-arm64.cc
diff --git a/src/builtins/arm64/builtins-arm64.cc b/src/builtins/arm64/builtins-arm64.cc
index 79184bebe176cfa9494d234bef47fc53c5e88078..a7e768570b21d4a50cfea52522788edb15f0486f 100644
--- a/src/builtins/arm64/builtins-arm64.cc
+++ b/src/builtins/arm64/builtins-arm64.cc
@@ -3164,6 +3164,35 @@ void Builtins::Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm) {
   }
 }
 
+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