1 files changed, 111 insertions, 0 deletions

diff --git a/contrib/llvm-project/llvm/lib/Target/AVR/AVRMCInstLower.cpp b/contrib/llvm-project/llvm/lib/Target/AVR/AVRMCInstLower.cpp
new file mode 100644
index 000000000000..49a318762b63
--- /dev/null
+++ b/contrib/llvm-project/llvm/lib/Target/AVR/AVRMCInstLower.cpp
@@ -0,0 +1,111 @@
+//===-- AVRMCInstLower.cpp - Convert AVR MachineInstr to an MCInst --------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains code to lower AVR MachineInstrs to their corresponding
+// MCInst records.
+//
+//===----------------------------------------------------------------------===//
+
+#include "AVRMCInstLower.h"
+
+#include "AVRInstrInfo.h"
+#include "MCTargetDesc/AVRMCExpr.h"
+
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/IR/Mangler.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/Support/ErrorHandling.h"
+
+namespace llvm {
+
+MCOperand AVRMCInstLower::lowerSymbolOperand(const MachineOperand &MO,
+                                             MCSymbol *Sym) const {
+  unsigned char TF = MO.getTargetFlags();
+  const MCExpr *Expr = MCSymbolRefExpr::create(Sym, Ctx);
+
+  bool IsNegated = false;
+  if (TF & AVRII::MO_NEG) { IsNegated = true; }
+
+  if (!MO.isJTI() && MO.getOffset()) {
+    Expr = MCBinaryExpr::createAdd(
+        Expr, MCConstantExpr::create(MO.getOffset(), Ctx), Ctx);
+  }
+
+  bool IsFunction = MO.isGlobal() && isa<Function>(MO.getGlobal());
+
+  if (TF & AVRII::MO_LO) {
+    if (IsFunction) {
+      // N.B. Should we use _GS fixups here to cope with >128k progmem?
+      Expr = AVRMCExpr::create(AVRMCExpr::VK_AVR_PM_LO8, Expr, IsNegated, Ctx);
+    } else {
+      Expr = AVRMCExpr::create(AVRMCExpr::VK_AVR_LO8, Expr, IsNegated, Ctx);
+    }
+  } else if (TF & AVRII::MO_HI) {
+    if (IsFunction) {
+      // N.B. Should we use _GS fixups here to cope with >128k progmem?
+      Expr = AVRMCExpr::create(AVRMCExpr::VK_AVR_PM_HI8, Expr, IsNegated, Ctx);
+    } else {
+      Expr = AVRMCExpr::create(AVRMCExpr::VK_AVR_HI8, Expr, IsNegated, Ctx);
+    }
+  } else if (TF != 0) {
+    llvm_unreachable("Unknown target flag on symbol operand");
+  }
+
+  return MCOperand::createExpr(Expr);
+}
+
+void AVRMCInstLower::lowerInstruction(const MachineInstr &MI, MCInst &OutMI) const {
+  OutMI.setOpcode(MI.getOpcode());
+
+  for (MachineOperand const &MO : MI.operands()) {
+    MCOperand MCOp;
+
+    switch (MO.getType()) {
+    default:
+      MI.print(errs());
+      llvm_unreachable("unknown operand type");
+    case MachineOperand::MO_Register:
+      // Ignore all implicit register operands.
+      if (MO.isImplicit())
+        continue;
+      MCOp = MCOperand::createReg(MO.getReg());
+      break;
+    case MachineOperand::MO_Immediate:
+      MCOp = MCOperand::createImm(MO.getImm());
+      break;
+    case MachineOperand::MO_GlobalAddress:
+      MCOp = lowerSymbolOperand(MO, Printer.getSymbol(MO.getGlobal()));
+      break;
+    case MachineOperand::MO_ExternalSymbol:
+      MCOp = lowerSymbolOperand(
+          MO, Printer.GetExternalSymbolSymbol(MO.getSymbolName()));
+      break;
+    case MachineOperand::MO_MachineBasicBlock:
+      MCOp = MCOperand::createExpr(
+          MCSymbolRefExpr::create(MO.getMBB()->getSymbol(), Ctx));
+      break;
+    case MachineOperand::MO_RegisterMask:
+      continue;
+    case MachineOperand::MO_BlockAddress:
+      MCOp = lowerSymbolOperand(
+          MO, Printer.GetBlockAddressSymbol(MO.getBlockAddress()));
+      break;
+    case MachineOperand::MO_JumpTableIndex:
+      MCOp = lowerSymbolOperand(MO, Printer.GetJTISymbol(MO.getIndex()));
+      break;
+    case MachineOperand::MO_ConstantPoolIndex:
+      MCOp = lowerSymbolOperand(MO, Printer.GetCPISymbol(MO.getIndex()));
+      break;
+    }
+
+    OutMI.addOperand(MCOp);
+  }
+}
+
+} // end of namespace llvm
+