[wasm] Lazy compilation for asm.js

src/builtins/mips/builtins-mips.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.
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 3089 matching lines @@
   __ Jump(t0);
 
   __ bind(&stack_overflow);
   {
     FrameScope frame(masm, StackFrame::MANUAL);
     __ CallRuntime(Runtime::kThrowStackOverflow);
     __ break_(0xCC);
   }
 }
 
+void Builtins::Generate_WasmCompileLazy(MacroAssembler* masm) {
+  {
+    FrameScope scope(masm, StackFrame::INTERNAL);
+
+    // Save all parameter registers (see wasm-linkage.cc). They might be
+    // overwritten in the runtime call below.
+    // Other registers (like context and root) are not relevant here. The
+    // CEntryStub will overwrite them anyway.
+    const RegList gp_regs = a0.bit() | a1.bit() | a2.bit() | a3.bit();
+    const RegList fp_regs = f2.bit() | f4.bit() | f6.bit() | f8.bit() |
+                            f10.bit() | f12.bit() | f14.bit();
+    __ MultiPush(gp_regs);
+    __ MultiPushFPU(fp_regs);
+
+    __ Move(kContextRegister, Smi::kZero);
+    __ CallRuntime(Runtime::kWasmCompileLazy);
+
+    // Restore registers.
+    __ MultiPopFPU(fp_regs);
+    __ MultiPop(gp_regs);
+  }
+  // Now jump to the instructions of the returned code object.
+  __ Addu(at, v0, Operand(Code::kHeaderSize - kHeapObjectTag));
+  __ Jump(at);
+}
+
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS