1 files changed, 137 insertions, 0 deletions
diff --git a/llvm/lib/MC/MCAsmBackend.cpp b/llvm/lib/MC/MCAsmBackend.cpp
new file mode 100644
index 000000000000..b800e9caee22
--- /dev/null
+++ b/llvm/lib/MC/MCAsmBackend.cpp
@@ -0,0 +1,137 @@
+//===- MCAsmBackend.cpp - Target MC Assembly Backend ----------------------===//
+//
+// 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/MCAsmBackend.h"
+#include "llvm/ADT/None.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/MC/MCCodePadder.h"
+#include "llvm/MC/MCELFObjectWriter.h"
+#include "llvm/MC/MCFixupKindInfo.h"
+#include "llvm/MC/MCMachObjectWriter.h"
+#include "llvm/MC/MCObjectWriter.h"
+#include "llvm/MC/MCWasmObjectWriter.h"
+#include "llvm/MC/MCWinCOFFObjectWriter.h"
+#include "llvm/MC/MCXCOFFObjectWriter.h"
+#include <cassert>
+#include <cstddef>
+#include <cstdint>
+
+using namespace llvm;
+
+MCAsmBackend::MCAsmBackend(support::endianness Endian)
+    : CodePadder(new MCCodePadder()), Endian(Endian) {}
+
+MCAsmBackend::~MCAsmBackend() = default;
+
+std::unique_ptr<MCObjectWriter>
+MCAsmBackend::createObjectWriter(raw_pwrite_stream &OS) const {
+  auto TW = createObjectTargetWriter();
+  switch (TW->getFormat()) {
+  case Triple::ELF:
+    return createELFObjectWriter(cast<MCELFObjectTargetWriter>(std::move(TW)), OS,
+                                 Endian == support::little);
+  case Triple::MachO:
+    return createMachObjectWriter(cast<MCMachObjectTargetWriter>(std::move(TW)),
+                                  OS, Endian == support::little);
+  case Triple::COFF:
+    return createWinCOFFObjectWriter(
+        cast<MCWinCOFFObjectTargetWriter>(std::move(TW)), OS);
+  case Triple::Wasm:
+    return createWasmObjectWriter(cast<MCWasmObjectTargetWriter>(std::move(TW)),
+                                  OS);
+  case Triple::XCOFF:
+    return createXCOFFObjectWriter(
+        cast<MCXCOFFObjectTargetWriter>(std::move(TW)), OS);
+  default:
+    llvm_unreachable("unexpected object format");
+  }
+}
+
+std::unique_ptr<MCObjectWriter>
+MCAsmBackend::createDwoObjectWriter(raw_pwrite_stream &OS,
+                                    raw_pwrite_stream &DwoOS) const {
+  auto TW = createObjectTargetWriter();
+  if (TW->getFormat() != Triple::ELF)
+    report_fatal_error("dwo only supported with ELF");
+  return createELFDwoObjectWriter(cast<MCELFObjectTargetWriter>(std::move(TW)),
+                                  OS, DwoOS, Endian == support::little);
+}
+
+Optional<MCFixupKind> MCAsmBackend::getFixupKind(StringRef Name) const {
+  return None;
+}
+
+const MCFixupKindInfo &MCAsmBackend::getFixupKindInfo(MCFixupKind Kind) const {
+  static const MCFixupKindInfo Builtins[] = {
+      {"FK_NONE", 0, 0, 0},
+      {"FK_Data_1", 0, 8, 0},
+      {"FK_Data_2", 0, 16, 0},
+      {"FK_Data_4", 0, 32, 0},
+      {"FK_Data_8", 0, 64, 0},
+      {"FK_Data_6b", 0, 6, 0},
+      {"FK_PCRel_1", 0, 8, MCFixupKindInfo::FKF_IsPCRel},
+      {"FK_PCRel_2", 0, 16, MCFixupKindInfo::FKF_IsPCRel},
+      {"FK_PCRel_4", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
+      {"FK_PCRel_8", 0, 64, MCFixupKindInfo::FKF_IsPCRel},
+      {"FK_GPRel_1", 0, 8, 0},
+      {"FK_GPRel_2", 0, 16, 0},
+      {"FK_GPRel_4", 0, 32, 0},
+      {"FK_GPRel_8", 0, 64, 0},
+      {"FK_DTPRel_4", 0, 32, 0},
+      {"FK_DTPRel_8", 0, 64, 0},
+      {"FK_TPRel_4", 0, 32, 0},
+      {"FK_TPRel_8", 0, 64, 0},
+      {"FK_SecRel_1", 0, 8, 0},
+      {"FK_SecRel_2", 0, 16, 0},
+      {"FK_SecRel_4", 0, 32, 0},
+      {"FK_SecRel_8", 0, 64, 0},
+      {"FK_Data_Add_1", 0, 8, 0},
+      {"FK_Data_Add_2", 0, 16, 0},
+      {"FK_Data_Add_4", 0, 32, 0},
+      {"FK_Data_Add_8", 0, 64, 0},
+      {"FK_Data_Add_6b", 0, 6, 0},
+      {"FK_Data_Sub_1", 0, 8, 0},
+      {"FK_Data_Sub_2", 0, 16, 0},
+      {"FK_Data_Sub_4", 0, 32, 0},
+      {"FK_Data_Sub_8", 0, 64, 0},
+      {"FK_Data_Sub_6b", 0, 6, 0}};
+
+  assert((size_t)Kind <= array_lengthof(Builtins) && "Unknown fixup kind");
+  return Builtins[Kind];
+}
+
+bool MCAsmBackend::fixupNeedsRelaxationAdvanced(
+    const MCFixup &Fixup, bool Resolved, uint64_t Value,
+    const MCRelaxableFragment *DF, const MCAsmLayout &Layout,
+    const bool WasForced) const {
+  if (!Resolved)
+    return true;
+  return fixupNeedsRelaxation(Fixup, Value, DF, Layout);
+}
+
+void MCAsmBackend::handleCodePaddingBasicBlockStart(
+    MCObjectStreamer *OS, const MCCodePaddingContext &Context) {
+  CodePadder->handleBasicBlockStart(OS, Context);
+}
+
+void MCAsmBackend::handleCodePaddingBasicBlockEnd(
+    const MCCodePaddingContext &Context) {
+  CodePadder->handleBasicBlockEnd(Context);
+}
+
+void MCAsmBackend::handleCodePaddingInstructionBegin(const MCInst &Inst) {
+  CodePadder->handleInstructionBegin(Inst);
+}
+
+void MCAsmBackend::handleCodePaddingInstructionEnd(const MCInst &Inst) {
+  CodePadder->handleInstructionEnd(Inst);
+}
+
+bool MCAsmBackend::relaxFragment(MCPaddingFragment *PF, MCAsmLayout &Layout) {
+  return CodePadder->relaxFragment(PF, Layout);
+}