Hooking up asm-wasm conversion.

src/x87/builtins-x87.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_X87
 
 #include "src/code-factory.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 1000 matching lines @@
 void Builtins::Generate_CompileOptimized(MacroAssembler* masm) {
   GenerateTailCallToReturnedCode(masm,
                                  Runtime::kCompileOptimized_NotConcurrent);
 }
 
 
 void Builtins::Generate_CompileOptimizedConcurrent(MacroAssembler* masm) {
   GenerateTailCallToReturnedCode(masm, Runtime::kCompileOptimized_Concurrent);
 }
 
+void Builtins::Generate_InstantiateAsmJs(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- eax : argument count (preserved for callee)
+  //  -- edx : new target (preserved for callee)
+  //  -- edi : target function (preserved for callee)
+  // -----------------------------------
+  Label failed;
+  {
+    FrameScope scope(masm, StackFrame::INTERNAL);
+    // Push the number of arguments to the callee.
+    __ SmiTag(eax);
+    __ push(eax);
+    // Push a copy of the target function and the new target.
+    __ push(edi);
+    __ push(edx);
+
+    // The function.
+    __ push(edi);
+    // Copy arguments from caller (stdlib, foreign, heap).
+    for (int i = 2; i >= 0; --i) {
+      __ push(Operand(
+          ebp, StandardFrameConstants::kCallerSPOffset + i * kPointerSize));
+    }
+    // Call runtime, on success unwind frame, and parent frame.
+    __ CallRuntime(Runtime::kInstantiateAsmJs, 4);
+    // A smi 0 is returned on failure, an object on success.
+    __ JumpIfSmi(eax, &failed, Label::kNear);
+    scope.GenerateLeaveFrame();
+    __ ret(4 * kPointerSize);
+
+    __ bind(&failed);
+    // Restore target function and new target.
+    __ pop(edx);
+    __ pop(edi);
+    __ pop(eax);
+    __ SmiUntag(eax);
+  }
+  // On failure, tail call back to regular js.
+  GenerateTailCallToReturnedCode(masm, Runtime::kCompileLazy);
+}
 
 static void GenerateMakeCodeYoungAgainCommon(MacroAssembler* masm) {
   // For now, we are relying on the fact that make_code_young doesn't do any
   // garbage collection which allows us to save/restore the registers without
   // worrying about which of them contain pointers. We also don't build an
   // internal frame to make the code faster, since we shouldn't have to do stack
   // crawls in MakeCodeYoung. This seems a bit fragile.
 
   // Re-execute the code that was patched back to the young age when
   // the stub returns.
@@ skipping 1973 matching lines @@
   // And "return" to the OSR entry point of the function.
   __ ret(0);
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X87