From 6a65631cbdcae75bfa1e64323a6ad613a922cd1a Mon Sep 17 00:00:00 2001
From: Jarred Sumner <709451+Jarred-Sumner@users.noreply.github.com>
Date: Mon, 15 Aug 2022 01:48:31 -0700
Subject: [bun:ffi] Improve `ptr()` performance and implement code generation
 for DOMJIT

---
 src/bun.js/bindings/ZigGeneratedCode.cpp | 60 ++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 src/bun.js/bindings/ZigGeneratedCode.cpp

(limited to 'src/bun.js/bindings/ZigGeneratedCode.cpp')

diff --git a/src/bun.js/bindings/ZigGeneratedCode.cpp b/src/bun.js/bindings/ZigGeneratedCode.cpp
new file mode 100644
index 000000000..e5e377d82
--- /dev/null
+++ b/src/bun.js/bindings/ZigGeneratedCode.cpp
@@ -0,0 +1,60 @@
+#include "root.h"
+
+#include <JavaScriptCore/DOMJITAbstractHeap.h>
+#include "DOMJITIDLConvert.h"
+#include "DOMJITIDLType.h"
+#include "DOMJITIDLTypeFilter.h"
+#include "DOMJITHelpers.h"
+#include <JavaScriptCore/DFGAbstractHeap.h>
+
+#include "JSDOMConvertBufferSource.h"
+
+using namespace JSC;
+using namespace WebCore;
+
+/* -- BEGIN DOMCall DEFINITIONS -- */
+
+extern "C" JSC_DECLARE_HOST_FUNCTION(FFI__ptr__slowpathWrapper);
+extern "C" JSC_DECLARE_JIT_OPERATION_WITHOUT_WTF_INTERNAL(FFI__ptr__fastpathWrapper, EncodedJSValue, (JSC::JSGlobalObject * lexicalGlobalObject, void* thisValue, JSC::JSUint8Array*));
+
+JSC_DEFINE_JIT_OPERATION(FFI__ptr__fastpathWrapper, EncodedJSValue, (JSC::JSGlobalObject * lexicalGlobalObject, void* thisValue, JSC::JSUint8Array* arg1))
+{
+    VM& vm = JSC::getVM(lexicalGlobalObject);
+    IGNORE_WARNINGS_BEGIN("frame-address")
+    CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
+    IGNORE_WARNINGS_END
+    JSC::JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
+    return FFI__ptr__fastpath(lexicalGlobalObject, thisValue, arg1);
+}
+JSC_DEFINE_HOST_FUNCTION(FFI__ptr__slowpathWrapper, (JSC::JSGlobalObject * globalObject, JSC::CallFrame* frame))
+{
+    return FFI__ptr__slowpath(globalObject, JSValue::encode(frame->thisValue()), reinterpret_cast<JSC::EncodedJSValue*>(frame->addressOfArgumentsStart()), frame->argumentCount());
+}
+
+constexpr JSC::DFG::AbstractHeapKind encodeIntoRead[4] = { JSC::DFG::Absolute, JSC::DFG::MiscFields, JSC::DFG::TypedArrayProperties };
+constexpr JSC::DFG::AbstractHeapKind encodeIntoWrite[4] = { JSC::DFG::Absolute, JSC::DFG::TypedArrayProperties };
+
+extern "C" void FFI__ptr__put(JSC::JSGlobalObject* globalObject, JSC::EncodedJSValue value)
+{
+    JSC::JSObject* thisObject = JSC::jsCast<JSC::JSObject*>(JSC::JSValue::decode(value));
+    static const JSC::DOMJIT::Signature DOMJIT_ptr_signature(
+        FFI__ptr__fastpathWrapper,
+        thisObject->classInfo(),
+        JSC::DOMJIT::Effect::forReadWriteKinds(encodeIntoRead, encodeIntoWrite),
+        JSC::SpecNonIntAsDouble,
+        JSC::SpecUint8Array);
+    JSFunction* function = JSFunction::create(
+        globalObject->vm(),
+        globalObject,
+        1,
+        String("ptr"_s),
+        FFI__ptr__slowpathWrapper, ImplementationVisibility::Public, NoIntrinsic, FFI__ptr__slowpathWrapper,
+        &DOMJIT_ptr_signature);
+    thisObject->putDirect(
+        globalObject->vm(),
+        Identifier::fromString(globalObject->vm(), "ptr"_s),
+        function,
+        JSC::PropertyAttribute::Function | JSC::PropertyAttribute::DOMJITFunction | 0);
+}
+
+/* -- END DOMCall DEFINITIONS-- */
-- 
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