[wasm] Lazy compilation for asm.js

src/builtins/mips/builtins-mips.cc

Index: src/builtins/mips/builtins-mips.cc
diff --git a/src/builtins/mips/builtins-mips.cc b/src/builtins/mips/builtins-mips.cc
index 145af2c47467cce36f42d5b9a33d2bbc54ae4f4e..cafdd335ab2a4ab9d1055080943a9d12f0390a0f 100644
--- a/src/builtins/mips/builtins-mips.cc
+++ b/src/builtins/mips/builtins-mips.cc
@@ -3107,6 +3107,32 @@ void Builtins::Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm) {
   }
 }
 
+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