5 files changed, 169 insertions, 0 deletions
diff --git a/lib/Target/BPF/InstPrinter/BPFInstPrinter.cpp b/lib/Target/BPF/InstPrinter/BPFInstPrinter.cpp
new file mode 100644
index 0000000..3f09379
--- /dev/null
+++ b/lib/Target/BPF/InstPrinter/BPFInstPrinter.cpp
@@ -0,0 +1,86 @@
+//===-- BPFInstPrinter.cpp - Convert BPF MCInst to asm syntax -------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This class prints an BPF MCInst to a .s file.
+//
+//===----------------------------------------------------------------------===//
+
+#include "BPF.h"
+#include "BPFInstPrinter.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FormattedStream.h"
+using namespace llvm;
+
+#define DEBUG_TYPE "asm-printer"
+
+// Include the auto-generated portion of the assembly writer.
+#include "BPFGenAsmWriter.inc"
+
+void BPFInstPrinter::printInst(const MCInst *MI, raw_ostream &O,
+                               StringRef Annot) {
+  printInstruction(MI, O);
+  printAnnotation(O, Annot);
+}
+
+static void printExpr(const MCExpr *Expr, raw_ostream &O) {
+  const MCSymbolRefExpr *SRE;
+
+  if (const MCBinaryExpr *BE = dyn_cast<MCBinaryExpr>(Expr))
+    SRE = dyn_cast<MCSymbolRefExpr>(BE->getLHS());
+  else
+    SRE = dyn_cast<MCSymbolRefExpr>(Expr);
+  assert(SRE && "Unexpected MCExpr type.");
+
+  MCSymbolRefExpr::VariantKind Kind = SRE->getKind();
+
+  assert(Kind == MCSymbolRefExpr::VK_None);
+  O << *Expr;
+}
+
+void BPFInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
+                                  raw_ostream &O, const char *Modifier) {
+  assert((Modifier == 0 || Modifier[0] == 0) && "No modifiers supported");
+  const MCOperand &Op = MI->getOperand(OpNo);
+  if (Op.isReg()) {
+    O << getRegisterName(Op.getReg());
+  } else if (Op.isImm()) {
+    O << (int32_t)Op.getImm();
+  } else {
+    assert(Op.isExpr() && "Expected an expression");
+    printExpr(Op.getExpr(), O);
+  }
+}
+
+void BPFInstPrinter::printMemOperand(const MCInst *MI, int OpNo, raw_ostream &O,
+                                     const char *Modifier) {
+  const MCOperand &RegOp = MI->getOperand(OpNo);
+  const MCOperand &OffsetOp = MI->getOperand(OpNo + 1);
+  // offset
+  if (OffsetOp.isImm())
+    O << formatDec(OffsetOp.getImm());
+  else
+    assert(0 && "Expected an immediate");
+
+  // register
+  assert(RegOp.isReg() && "Register operand not a register");
+  O << '(' << getRegisterName(RegOp.getReg()) << ')';
+}
+
+void BPFInstPrinter::printImm64Operand(const MCInst *MI, unsigned OpNo,
+                                       raw_ostream &O) {
+  const MCOperand &Op = MI->getOperand(OpNo);
+  if (Op.isImm())
+    O << (uint64_t)Op.getImm();
+  else
+    O << Op;
+}
diff --git a/lib/Target/BPF/InstPrinter/BPFInstPrinter.h b/lib/Target/BPF/InstPrinter/BPFInstPrinter.h
new file mode 100644
index 0000000..d7c2899
--- /dev/null
+++ b/lib/Target/BPF/InstPrinter/BPFInstPrinter.h
@@ -0,0 +1,41 @@
+//===-- BPFInstPrinter.h - Convert BPF MCInst to asm syntax -------*- C++ -*--//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This class prints a BPF MCInst to a .s file.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_BPF_INSTPRINTER_BPFINSTPRINTER_H
+#define LLVM_LIB_TARGET_BPF_INSTPRINTER_BPFINSTPRINTER_H
+
+#include "llvm/MC/MCInstPrinter.h"
+
+namespace llvm {
+class MCOperand;
+
+class BPFInstPrinter : public MCInstPrinter {
+public:
+  BPFInstPrinter(const MCAsmInfo &MAI, const MCInstrInfo &MII,
+                 const MCRegisterInfo &MRI)
+      : MCInstPrinter(MAI, MII, MRI) {}
+
+  void printInst(const MCInst *MI, raw_ostream &O, StringRef Annot) override;
+  void printOperand(const MCInst *MI, unsigned OpNo, raw_ostream &O,
+                    const char *Modifier = nullptr);
+  void printMemOperand(const MCInst *MI, int OpNo, raw_ostream &O,
+                       const char *Modifier = nullptr);
+  void printImm64Operand(const MCInst *MI, unsigned OpNo, raw_ostream &O);
+
+  // Autogenerated by tblgen.
+  void printInstruction(const MCInst *MI, raw_ostream &O);
+  static const char *getRegisterName(unsigned RegNo);
+};
+}
+
+#endif
diff --git a/lib/Target/BPF/InstPrinter/CMakeLists.txt b/lib/Target/BPF/InstPrinter/CMakeLists.txt
new file mode 100644
index 0000000..f9e9161
--- /dev/null
+++ b/lib/Target/BPF/InstPrinter/CMakeLists.txt
@@ -0,0 +1,3 @@
+add_llvm_library(LLVMBPFAsmPrinter
+  BPFInstPrinter.cpp
+  )
diff --git a/lib/Target/BPF/InstPrinter/LLVMBuild.txt b/lib/Target/BPF/InstPrinter/LLVMBuild.txt
new file mode 100644
index 0000000..88a937a
--- /dev/null
+++ b/lib/Target/BPF/InstPrinter/LLVMBuild.txt
@@ -0,0 +1,23 @@
+;===- ./lib/Target/BPF/InstPrinter/LLVMBuild.txt ---------------*- Conf -*--===;
+;
+;                     The LLVM Compiler Infrastructure
+;
+; This file is distributed under the University of Illinois Open Source
+; License. See LICENSE.TXT for details.
+;
+;===------------------------------------------------------------------------===;
+;
+; This is an LLVMBuild description file for the components in this subdirectory.
+;
+; For more information on the LLVMBuild system, please see:
+;
+;   http://llvm.org/docs/LLVMBuild.html
+;
+;===------------------------------------------------------------------------===;
+
+[component_0]
+type = Library
+name = BPFAsmPrinter
+parent = BPF
+required_libraries = MC Support
+add_to_library_groups = BPF
diff --git a/lib/Target/BPF/InstPrinter/Makefile b/lib/Target/BPF/InstPrinter/Makefile
new file mode 100644
index 0000000..f46af83
--- /dev/null
+++ b/lib/Target/BPF/InstPrinter/Makefile
@@ -0,0 +1,16 @@
+##===- lib/Target/BPF/InstPrinter/Makefile -----------------*- Makefile -*-===##
+#
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+##===----------------------------------------------------------------------===##
+
+LEVEL = ../../../..
+LIBRARYNAME = LLVMBPFAsmPrinter
+
+# Hack: we need to include 'main' BPF target directory to grab private headers
+CPP.Flags += -I$(PROJ_OBJ_DIR)/.. -I$(PROJ_SRC_DIR)/..
+
+include $(LEVEL)/Makefile.common