sink the arm implementations of ASmPrinter and MCInstLower

out of the AsmPrinter directory into libarm.  Now the
ARM InstPrinters depend jsut on the MC stuff, not on vmcore
or codegen.

llvm-svn: 108783

1 files changed, 162 insertions, 0 deletions

diff --git a/llvm/lib/Target/ARM/ARMMCInstLower.cpp b/llvm/lib/Target/ARM/ARMMCInstLower.cpp
new file mode 100644
index 00000000000..ab2b06b6078
--- /dev/null
+++ b/llvm/lib/Target/ARM/ARMMCInstLower.cpp
@@ -0,0 +1,162 @@
+//===-- ARMMCInstLower.cpp - Convert ARM MachineInstr to an MCInst --------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains code to lower ARM MachineInstrs to their corresponding
+// MCInst records.
+//
+//===----------------------------------------------------------------------===//
+
+#include "ARMMCInstLower.h"
+//#include "llvm/CodeGen/MachineModuleInfoImpls.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineBasicBlock.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+//#include "llvm/MC/MCStreamer.h"
+#include "llvm/Target/Mangler.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/ADT/SmallString.h"
+using namespace llvm;
+
+
+#if 0
+const ARMSubtarget &ARMMCInstLower::getSubtarget() const {
+  return AsmPrinter.getSubtarget();
+}
+
+MachineModuleInfoMachO &ARMMCInstLower::getMachOMMI() const {
+  assert(getSubtarget().isTargetDarwin() &&"Can only get MachO info on darwin");
+  return AsmPrinter.MMI->getObjFileInfo<MachineModuleInfoMachO>(); 
+}
+#endif
+
+MCSymbol *ARMMCInstLower::
+GetGlobalAddressSymbol(const MachineOperand &MO) const {
+  // FIXME: HANDLE PLT references how??
+  switch (MO.getTargetFlags()) {
+  default: assert(0 && "Unknown target flag on GV operand");
+  case 0: break;
+  }
+  
+  return Printer.Mang->getSymbol(MO.getGlobal());
+}
+
+MCSymbol *ARMMCInstLower::
+GetExternalSymbolSymbol(const MachineOperand &MO) const {
+  // FIXME: HANDLE PLT references how??
+  switch (MO.getTargetFlags()) {
+  default: assert(0 && "Unknown target flag on GV operand");
+  case 0: break;
+  }
+  
+  return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
+}
+
+
+
+MCSymbol *ARMMCInstLower::
+GetJumpTableSymbol(const MachineOperand &MO) const {
+  SmallString<256> Name;
+  raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"
+    << Printer.getFunctionNumber() << '_' << MO.getIndex();
+  
+#if 0
+  switch (MO.getTargetFlags()) {
+    default: llvm_unreachable("Unknown target flag on GV operand");
+  }
+#endif
+  
+  // Create a symbol for the name.
+  return Ctx.GetOrCreateSymbol(Name.str());
+}
+
+MCSymbol *ARMMCInstLower::
+GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
+  SmallString<256> Name;
+  raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"
+    << Printer.getFunctionNumber() << '_' << MO.getIndex();
+  
+#if 0
+  switch (MO.getTargetFlags()) {
+  default: llvm_unreachable("Unknown target flag on GV operand");
+  }
+#endif
+  
+  // Create a symbol for the name.
+  return Ctx.GetOrCreateSymbol(Name.str());
+}
+  
+MCOperand ARMMCInstLower::
+LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const {
+  // FIXME: We would like an efficient form for this, so we don't have to do a
+  // lot of extra uniquing.
+  const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
+  
+#if 0
+  switch (MO.getTargetFlags()) {
+  default: llvm_unreachable("Unknown target flag on GV operand");
+  }
+#endif
+  
+  if (!MO.isJTI() && MO.getOffset())
+    Expr = MCBinaryExpr::CreateAdd(Expr,
+                                   MCConstantExpr::Create(MO.getOffset(), Ctx),
+                                   Ctx);
+  return MCOperand::CreateExpr(Expr);
+}
+
+
+void ARMMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
+  OutMI.setOpcode(MI->getOpcode());
+  
+  for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
+    const MachineOperand &MO = MI->getOperand(i);
+    
+    MCOperand MCOp;
+    switch (MO.getType()) {
+    default:
+      MI->dump();
+      assert(0 && "unknown operand type");
+    case MachineOperand::MO_Register:
+      // Ignore all implicit register operands.
+      if (MO.isImplicit()) continue;
+      assert(!MO.getSubReg() && "Subregs should be eliminated!");
+      MCOp = MCOperand::CreateReg(MO.getReg());
+      break;
+    case MachineOperand::MO_Immediate:
+      MCOp = MCOperand::CreateImm(MO.getImm());
+      break;
+    case MachineOperand::MO_MachineBasicBlock:
+      MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
+                       MO.getMBB()->getSymbol(), Ctx));
+      break;
+    case MachineOperand::MO_GlobalAddress:
+      MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
+      break;
+    case MachineOperand::MO_ExternalSymbol:
+      MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
+      break;
+    case MachineOperand::MO_JumpTableIndex:
+      MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
+      break;
+    case MachineOperand::MO_ConstantPoolIndex:
+      MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
+      break;
+    case MachineOperand::MO_BlockAddress:
+      MCOp = LowerSymbolOperand(MO, Printer.GetBlockAddressSymbol(
+                                              MO.getBlockAddress()));
+      break;
+    }
+    
+    OutMI.addOperand(MCOp);
+  }
+  
+}