1 files changed, 87 insertions, 0 deletions
diff --git a/lib/Target/BPF/BPFAsmPrinter.cpp b/lib/Target/BPF/BPFAsmPrinter.cpp
new file mode 100644
index 0000000..dbc7bfe
--- /dev/null
+++ b/lib/Target/BPF/BPFAsmPrinter.cpp
@@ -0,0 +1,87 @@
+//===-- BPFAsmPrinter.cpp - BPF LLVM assembly writer ----------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains a printer that converts from our internal representation
+// of machine-dependent LLVM code to the BPF assembly language.
+//
+//===----------------------------------------------------------------------===//
+
+#include "BPF.h"
+#include "BPFInstrInfo.h"
+#include "BPFMCInstLower.h"
+#include "BPFTargetMachine.h"
+#include "InstPrinter/BPFInstPrinter.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineConstantPool.h"
+#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace llvm;
+
+#define DEBUG_TYPE "asm-printer"
+
+namespace {
+class BPFAsmPrinter : public AsmPrinter {
+public:
+  explicit BPFAsmPrinter(TargetMachine &TM, std::unique_ptr<MCStreamer> Streamer)
+      : AsmPrinter(TM, std::move(Streamer)) {}
+
+  const char *getPassName() const override { return "BPF Assembly Printer"; }
+
+  void printOperand(const MachineInstr *MI, int OpNum, raw_ostream &O,
+                    const char *Modifier = nullptr);
+  void EmitInstruction(const MachineInstr *MI) override;
+};
+}
+
+void BPFAsmPrinter::printOperand(const MachineInstr *MI, int OpNum,
+                                 raw_ostream &O, const char *Modifier) {
+  const MachineOperand &MO = MI->getOperand(OpNum);
+
+  switch (MO.getType()) {
+  case MachineOperand::MO_Register:
+    O << BPFInstPrinter::getRegisterName(MO.getReg());
+    break;
+
+  case MachineOperand::MO_Immediate:
+    O << MO.getImm();
+    break;
+
+  case MachineOperand::MO_MachineBasicBlock:
+    O << *MO.getMBB()->getSymbol();
+    break;
+
+  case MachineOperand::MO_GlobalAddress:
+    O << *getSymbol(MO.getGlobal());
+    break;
+
+  default:
+    llvm_unreachable("<unknown operand type>");
+  }
+}
+
+void BPFAsmPrinter::EmitInstruction(const MachineInstr *MI) {
+
+  BPFMCInstLower MCInstLowering(OutContext, *this);
+
+  MCInst TmpInst;
+  MCInstLowering.Lower(MI, TmpInst);
+  EmitToStreamer(OutStreamer, TmpInst);
+}
+
+// Force static initialization.
+extern "C" void LLVMInitializeBPFAsmPrinter() {
+  RegisterAsmPrinter<BPFAsmPrinter> X(TheBPFTarget);
+}