add support for JIT compilation

lib/lepton/asmjit/arm/a64compiler.cpp

@@ -0,0 +1,60 @@
+// This file is part of AsmJit project <https://asmjit.com>
+//
+// See asmjit.h or LICENSE.md for license and copyright information
+// SPDX-License-Identifier: Zlib
+
+#include "../core/api-build_p.h"
+#if !defined(ASMJIT_NO_AARCH64) && !defined(ASMJIT_NO_COMPILER)
+
+#include "../arm/a64assembler.h"
+#include "../arm/a64compiler.h"
+#include "../arm/a64emithelper_p.h"
+#include "../arm/a64rapass_p.h"
+
+ASMJIT_BEGIN_SUB_NAMESPACE(a64)
+
+// a64::Compiler - Construction & Destruction
+// ==========================================
+
+Compiler::Compiler(CodeHolder* code) noexcept : BaseCompiler() {
+  _archMask = uint64_t(1) << uint32_t(Arch::kAArch64);
+  assignEmitterFuncs(this);
+
+  if (code)
+    code->attach(this);
+}
+Compiler::~Compiler() noexcept {}
+
+// a64::Compiler - Events
+// ======================
+
+Error Compiler::onAttach(CodeHolder* code) noexcept {
+  ASMJIT_PROPAGATE(Base::onAttach(code));
+  Error err = addPassT<ARMRAPass>();
+
+  if (ASMJIT_UNLIKELY(err)) {
+    onDetach(code);
+    return err;
+  }
+
+  return kErrorOk;
+}
+
+Error Compiler::onDetach(CodeHolder* code) noexcept {
+  return Base::onDetach(code);
+}
+
+// a64::Compiler - Finalize
+// ========================
+
+Error Compiler::finalize() {
+  ASMJIT_PROPAGATE(runPasses());
+  Assembler a(_code);
+  a.addEncodingOptions(encodingOptions());
+  a.addDiagnosticOptions(diagnosticOptions());
+  return serializeTo(&a);
+}
+
+ASMJIT_END_SUB_NAMESPACE
+
+#endif // !ASMJIT_NO_AARCH64 && !ASMJIT_NO_COMPILER