1 files changed, 59 insertions, 0 deletions
diff --git a/contrib/llvm-project/llvm/lib/MC/MCLinkerOptimizationHint.cpp b/contrib/llvm-project/llvm/lib/MC/MCLinkerOptimizationHint.cpp
new file mode 100644
index 000000000000..9ab321872b11
--- /dev/null
+++ b/contrib/llvm-project/llvm/lib/MC/MCLinkerOptimizationHint.cpp
@@ -0,0 +1,59 @@
+//===- llvm/MC/MCLinkerOptimizationHint.cpp ----- LOH handling ------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/MC/MCLinkerOptimizationHint.h"
+#include "llvm/MC/MCAsmLayout.h"
+#include "llvm/MC/MCMachObjectWriter.h"
+#include "llvm/Support/LEB128.h"
+#include "llvm/Support/raw_ostream.h"
+#include <cstddef>
+#include <cstdint>
+
+using namespace llvm;
+
+// Each LOH is composed by, in this order (each field is encoded using ULEB128):
+// - Its kind.
+// - Its number of arguments (let say N).
+// - Its arg1.
+// - ...
+// - Its argN.
+// <arg1> to <argN> are absolute addresses in the object file, i.e.,
+// relative addresses from the beginning of the object file.
+void MCLOHDirective::emit_impl(raw_ostream &OutStream,
+                               const MachObjectWriter &ObjWriter,
+                               const MCAsmLayout &Layout) const {
+  encodeULEB128(Kind, OutStream);
+  encodeULEB128(Args.size(), OutStream);
+  for (const MCSymbol *Arg : Args)
+    encodeULEB128(ObjWriter.getSymbolAddress(*Arg, Layout), OutStream);
+}
+
+void MCLOHDirective::emit(MachObjectWriter &ObjWriter,
+                          const MCAsmLayout &Layout) const {
+  raw_ostream &OutStream = ObjWriter.W.OS;
+  emit_impl(OutStream, ObjWriter, Layout);
+}
+
+uint64_t MCLOHDirective::getEmitSize(const MachObjectWriter &ObjWriter,
+                                     const MCAsmLayout &Layout) const {
+  class raw_counting_ostream : public raw_ostream {
+    uint64_t Count = 0;
+
+    void write_impl(const char *, size_t size) override { Count += size; }
+
+    uint64_t current_pos() const override { return Count; }
+
+  public:
+    raw_counting_ostream() = default;
+    ~raw_counting_ostream() override { flush(); }
+  };
+
+  raw_counting_ostream OutStream;
+  emit_impl(OutStream, ObjWriter, Layout);
+  return OutStream.tell();
+}