1 files changed, 267 insertions, 0 deletions
diff --git a/lib/Target/MSP430/MSP430AsmPrinter.cpp b/lib/Target/MSP430/MSP430AsmPrinter.cpp
new file mode 100644
index 0000000000000..71b785bb4fe5f
--- /dev/null
+++ b/lib/Target/MSP430/MSP430AsmPrinter.cpp
@@ -0,0 +1,267 @@
+//===-- MSP430AsmPrinter.cpp - MSP430 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 MSP430 assembly language.
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "asm-printer"
+#include "MSP430.h"
+#include "MSP430InstrInfo.h"
+#include "MSP430TargetMachine.h"
+#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Module.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/DwarfWriter.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineConstantPool.h"
+#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/Target/TargetAsmInfo.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/Mangler.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace llvm;
+
+STATISTIC(EmittedInsts, "Number of machine instrs printed");
+
+namespace {
+  class VISIBILITY_HIDDEN MSP430AsmPrinter : public AsmPrinter {
+  public:
+    MSP430AsmPrinter(raw_ostream &O, MSP430TargetMachine &TM,
+                     const TargetAsmInfo *TAI,
+                     CodeGenOpt::Level OL, bool V)
+      : AsmPrinter(O, TM, TAI, OL, V) {}
+
+    virtual const char *getPassName() const {
+      return "MSP430 Assembly Printer";
+    }
+
+    void printOperand(const MachineInstr *MI, int OpNum,
+                      const char* Modifier = 0);
+    void printSrcMemOperand(const MachineInstr *MI, int OpNum,
+                            const char* Modifier = 0);
+    void printCCOperand(const MachineInstr *MI, int OpNum);
+    bool printInstruction(const MachineInstr *MI);  // autogenerated.
+    void printMachineInstruction(const MachineInstr * MI);
+
+    void emitFunctionHeader(const MachineFunction &MF);
+    bool runOnMachineFunction(MachineFunction &F);
+    bool doInitialization(Module &M);
+    bool doFinalization(Module &M);
+
+    void getAnalysisUsage(AnalysisUsage &AU) const {
+      AsmPrinter::getAnalysisUsage(AU);
+      AU.setPreservesAll();
+    }
+  };
+} // end of anonymous namespace
+
+#include "MSP430GenAsmWriter.inc"
+
+/// createMSP430CodePrinterPass - Returns a pass that prints the MSP430
+/// assembly code for a MachineFunction to the given output stream,
+/// using the given target machine description.  This should work
+/// regardless of whether the function is in SSA form.
+///
+FunctionPass *llvm::createMSP430CodePrinterPass(raw_ostream &o,
+                                                MSP430TargetMachine &tm,
+                                                CodeGenOpt::Level OptLevel,
+                                                bool verbose) {
+  return new MSP430AsmPrinter(o, tm, tm.getTargetAsmInfo(), OptLevel, verbose);
+}
+
+bool MSP430AsmPrinter::doInitialization(Module &M) {
+  Mang = new Mangler(M, "", TAI->getPrivateGlobalPrefix());
+  return false; // success
+}
+
+
+bool MSP430AsmPrinter::doFinalization(Module &M) {
+  return AsmPrinter::doFinalization(M);
+}
+
+void MSP430AsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
+  const Function *F = MF.getFunction();
+
+  SwitchToSection(TAI->SectionForGlobal(F));
+
+  unsigned FnAlign = 4;
+  if (F->hasFnAttr(Attribute::OptimizeForSize))
+    FnAlign = 1;
+
+  EmitAlignment(FnAlign, F);
+
+  switch (F->getLinkage()) {
+  default: assert(0 && "Unknown linkage type!");
+  case Function::InternalLinkage:  // Symbols default to internal.
+  case Function::PrivateLinkage:
+    break;
+  case Function::ExternalLinkage:
+    O << "\t.globl\t" << CurrentFnName << '\n';
+    break;
+  case Function::LinkOnceAnyLinkage:
+  case Function::LinkOnceODRLinkage:
+  case Function::WeakAnyLinkage:
+  case Function::WeakODRLinkage:
+    O << "\t.weak\t" << CurrentFnName << '\n';
+    break;
+  }
+
+  printVisibility(CurrentFnName, F->getVisibility());
+
+  O << "\t.type\t" << CurrentFnName << ",@function\n"
+    << CurrentFnName << ":\n";
+}
+
+bool MSP430AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
+  SetupMachineFunction(MF);
+  O << "\n\n";
+
+  // Print the 'header' of function
+  emitFunctionHeader(MF);
+
+  // Print out code for the function.
+  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
+       I != E; ++I) {
+    // Print a label for the basic block.
+    if (!VerboseAsm && (I->pred_empty() || I->isOnlyReachableByFallthrough())) {
+      // This is an entry block or a block that's only reachable via a
+      // fallthrough edge. In non-VerboseAsm mode, don't print the label.
+    } else {
+      printBasicBlockLabel(I, true, true, VerboseAsm);
+      O << '\n';
+    }
+
+    for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
+         II != E; ++II)
+      // Print the assembly for the instruction.
+      printMachineInstruction(II);
+  }
+
+  if (TAI->hasDotTypeDotSizeDirective())
+    O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
+
+  O.flush();
+
+  // We didn't modify anything
+  return false;
+}
+
+void MSP430AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
+  ++EmittedInsts;
+
+  // Call the autogenerated instruction printer routines.
+  if (printInstruction(MI))
+    return;
+
+  assert(0 && "Should not happen");
+}
+
+void MSP430AsmPrinter::printOperand(const MachineInstr *MI, int OpNum,
+                                    const char* Modifier) {
+  const MachineOperand &MO = MI->getOperand(OpNum);
+  switch (MO.getType()) {
+  case MachineOperand::MO_Register:
+    assert (TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
+            "Virtual registers should be already mapped!");
+    O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
+    return;
+  case MachineOperand::MO_Immediate:
+    if (!Modifier || strcmp(Modifier, "nohash"))
+      O << '#';
+    O << MO.getImm();
+    return;
+  case MachineOperand::MO_MachineBasicBlock:
+    printBasicBlockLabel(MO.getMBB());
+    return;
+  case MachineOperand::MO_GlobalAddress: {
+    bool isMemOp  = Modifier && !strcmp(Modifier, "mem");
+    bool isCallOp = Modifier && !strcmp(Modifier, "call");
+    std::string Name = Mang->getValueName(MO.getGlobal());
+    assert(MO.getOffset() == 0 && "No offsets allowed!");
+
+    if (isCallOp)
+      O << '#';
+    else if (isMemOp)
+      O << '&';
+
+    O << Name;
+
+    return;
+  }
+  case MachineOperand::MO_ExternalSymbol: {
+    bool isCallOp = Modifier && !strcmp(Modifier, "call");
+    std::string Name(TAI->getGlobalPrefix());
+    Name += MO.getSymbolName();
+    if (isCallOp)
+      O << '#';
+    O << Name;
+    return;
+  }
+  default:
+    assert(0 && "Not implemented yet!");
+  }
+}
+
+void MSP430AsmPrinter::printSrcMemOperand(const MachineInstr *MI, int OpNum,
+                                          const char* Modifier) {
+  const MachineOperand &Base = MI->getOperand(OpNum);
+  const MachineOperand &Disp = MI->getOperand(OpNum+1);
+
+  if (Base.isGlobal())
+    printOperand(MI, OpNum, "mem");
+  else if (Disp.isImm() && !Base.getReg())
+    printOperand(MI, OpNum);
+  else if (Base.getReg()) {
+    if (Disp.getImm()) {
+      printOperand(MI, OpNum + 1, "nohash");
+      O << '(';
+      printOperand(MI, OpNum);
+      O << ')';
+    } else {
+      O << '@';
+      printOperand(MI, OpNum);
+    }
+  } else
+    assert(0 && "Unsupported memory operand");
+}
+
+void MSP430AsmPrinter::printCCOperand(const MachineInstr *MI, int OpNum) {
+  unsigned CC = MI->getOperand(OpNum).getImm();
+
+  switch (CC) {
+  default:
+   assert(0 && "Unsupported CC code");
+   break;
+  case MSP430::COND_E:
+   O << "eq";
+   break;
+  case MSP430::COND_NE:
+   O << "ne";
+   break;
+  case MSP430::COND_HS:
+   O << "hs";
+   break;
+  case MSP430::COND_LO:
+   O << "lo";
+   break;
+  case MSP430::COND_GE:
+   O << "ge";
+   break;
+  case MSP430::COND_L:
+   O << 'l';
+   break;
+  }
+}