Bug 1314055 - Part 2: Support JSOP_TOASYNC in Baseline. r=jandem

js/src/jit/BaselineCompiler.cpp

@@ -22,6 +22,7 @@
 #include "jit/SharedICHelpers.h"
 #include "jit/VMFunctions.h"
 #include "js/UniquePtr.h"
+#include "vm/AsyncFunction.h"
 #include "vm/EnvironmentObject.h"
 #include "vm/Interpreter.h"
 #include "vm/TraceLogging.h"
@@ -3807,6 +3808,27 @@ BaselineCompiler::emit_JSOP_TOID()
     return true;
 }
 
+typedef JSObject* (*ToAsyncFn)(JSContext*, HandleFunction);
+static const VMFunction ToAsyncInfo = FunctionInfo<ToAsyncFn>(js::WrapAsyncFunction, "ToAsync");
+
+bool
+BaselineCompiler::emit_JSOP_TOASYNC()
+{
+    frame.syncStack(0);
+    masm.unboxObject(frame.addressOfStackValue(frame.peek(-1)), R0.scratchReg());
+
+    prepareVMCall();
+    pushArg(R0.scratchReg());
+
+    if (!callVM(ToAsyncInfo))
+        return false;
+
+    masm.tagValue(JSVAL_TYPE_OBJECT, ReturnReg, R0);
+    frame.pop();
+    frame.push(R0);
+    return true;
+}
+
 typedef bool (*ThrowObjectCoercibleFn)(JSContext*, HandleValue);
 static const VMFunction ThrowObjectCoercibleInfo =
     FunctionInfo<ThrowObjectCoercibleFn>(ThrowObjectCoercible, "ThrowObjectCoercible");

js/src/jit/BaselineCompiler.h

@@ -193,6 +193,7 @@ namespace jit {
     _(JSOP_ARGUMENTS)          \
     _(JSOP_RUNONCE)            \
     _(JSOP_REST)               \
+    _(JSOP_TOASYNC)            \
     _(JSOP_TOID)               \
     _(JSOP_TOSTRING)           \
     _(JSOP_TABLESWITCH)        \