add jump tables, constant pools and some trivial global

lowering stuff.  We can now compile hello world to:

_main:
	stm , 
	mov r7, sp
	sub sp, sp, #4
	mov r0, #0
	str r0, 
	ldr r0, 
	bl _printf
	ldr r0, 
	mov sp, r7
	ldm , 

Almost looks like arm code :)



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84542 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp

@@ -1311,7 +1311,7 @@ extern "C" void LLVMInitializeARMAsmPrinter() {
 //===----------------------------------------------------------------------===//
 
 void ARMAsmPrinter::printInstructionThroughMCStreamer(const MachineInstr *MI) {
-  ARMMCInstLower MCInstLowering(OutContext, Mang);
+  ARMMCInstLower MCInstLowering(OutContext, *Mang, getFunctionNumber(), *MAI);
   switch (MI->getOpcode()) {
   case TargetInstrInfo::DBG_LABEL:
   case TargetInstrInfo::EH_LABEL:

lib/Target/ARM/AsmPrinter/ARMInstPrinter.cpp

@@ -16,9 +16,8 @@
 #include "ARMAddressingModes.h"
 #include "llvm/MC/MCInst.h"
 #include "llvm/MC/MCAsmInfo.h"
-//#include "llvm/MC/MCExpr.h"
-//#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/FormattedStream.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/Support/raw_ostream.h"
 #include "ARMGenInstrNames.inc"
 using namespace llvm;
 
@@ -34,7 +33,8 @@ void ARMInstPrinter::printInst(const MCInst *MI) { printInstruction(MI); }
 
 void ARMInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
                                   const char *Modifier) {
-  assert((Modifier == 0 || Modifier[0] == 0) && "Cannot print modifiers");
+  // FIXME: TURN ASSERT ON.
+  //assert((Modifier == 0 || Modifier[0] == 0) && "Cannot print modifiers");
   
   const MCOperand &Op = MI->getOperand(OpNo);
   if (Op.isReg()) {
@@ -43,9 +43,7 @@ void ARMInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
     O << '#' << Op.getImm();
   } else {
     assert(Op.isExpr() && "unknown operand kind in printOperand");
-    assert(0 && "UNIMP");
-    //O << '$';
-    //Op.getExpr()->print(O, &MAI);
+    Op.getExpr()->print(O, &MAI);
   }
 }
 

lib/Target/ARM/AsmPrinter/ARMMCInstLower.cpp

@@ -13,16 +13,16 @@
 //===----------------------------------------------------------------------===//
 
 #include "ARMMCInstLower.h"
-//#include "ARMMCAsmInfo.h"
 //#include "llvm/CodeGen/MachineModuleInfoImpls.h"
 #include "llvm/CodeGen/MachineInstr.h"
-//#include "llvm/MC/MCContext.h"
-//#include "llvm/MC/MCExpr.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/Support/FormattedStream.h"
-//#include "llvm/Support/Mangler.h"
-//#include "llvm/ADT/SmallString.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/Mangler.h"
+#include "llvm/ADT/SmallString.h"
 using namespace llvm;
 
 
@@ -37,6 +37,74 @@ MachineModuleInfoMachO &ARMMCInstLower::getMachOMMI() const {
 }
 #endif
 
+MCSymbol *ARMMCInstLower::
+GetGlobalAddressSymbol(const MachineOperand &MO) const {
+  const GlobalValue *GV = MO.getGlobal();
+  
+  SmallString<128> Name;
+  Mang.getNameWithPrefix(Name, GV, false);
+  
+  // FIXME: HANDLE PLT references how??
+  switch (MO.getTargetFlags()) {
+  default: assert(0 && "Unknown target flag on GV operand");
+  case 0: break;
+  }
+  
+  return Ctx.GetOrCreateSymbol(Name.str());
+}
+
+
+MCSymbol *ARMMCInstLower::
+GetJumpTableSymbol(const MachineOperand &MO) const {
+  SmallString<256> Name;
+  raw_svector_ostream(Name) << MAI.getPrivateGlobalPrefix() << "JTI"
+    << CurFunctionNumber << '_' << 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) << MAI.getPrivateGlobalPrefix() << "CPI"
+    << CurFunctionNumber << '_' << 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());
@@ -60,19 +128,21 @@ void ARMMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
       MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
                        AsmPrinter.GetMBBSymbol(MO.getMBB()->getNumber()), Ctx));
       break;
+#endif
     case MachineOperand::MO_GlobalAddress:
       MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
       break;
+#if 0
     case MachineOperand::MO_ExternalSymbol:
       MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
       break;
+#endif
     case MachineOperand::MO_JumpTableIndex:
       MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
       break;
     case MachineOperand::MO_ConstantPoolIndex:
       MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
       break;
-#endif
     }
     
     OutMI.addOperand(MCOp);

lib/Target/ARM/AsmPrinter/ARMMCInstLower.h

@@ -13,6 +13,7 @@
 #include "llvm/Support/Compiler.h"
 
 namespace llvm {
+  class MCAsmInfo;
   class MCContext;
   class MCInst;
   class MCOperand;
@@ -26,24 +27,27 @@ namespace llvm {
 /// ARMMCInstLower - This class is used to lower an MachineInstr into an MCInst.
 class VISIBILITY_HIDDEN ARMMCInstLower {
   MCContext &Ctx;
-  Mangler *Mang;
+  Mangler &Mang;
+  
+  const unsigned CurFunctionNumber;
+  const MCAsmInfo &MAI;
 
   //const ARMSubtarget &getSubtarget() const;
 public:
-  ARMMCInstLower(MCContext &ctx, Mangler *mang)
-    : Ctx(ctx), Mang(mang) {}
+  ARMMCInstLower(MCContext &ctx, Mangler &mang, unsigned FuncNum,
+                 const MCAsmInfo &mai)
+    : Ctx(ctx), Mang(mang), CurFunctionNumber(FuncNum), MAI(mai) {}
   
   void Lower(const MachineInstr *MI, MCInst &OutMI) const;
 
-/*
- MCSymbol *GetPICBaseSymbol() const;
-  
+  //MCSymbol *GetPICBaseSymbol() const;
   MCSymbol *GetGlobalAddressSymbol(const MachineOperand &MO) const;
-  MCSymbol *GetExternalSymbolSymbol(const MachineOperand &MO) const;
+  //MCSymbol *GetExternalSymbolSymbol(const MachineOperand &MO) const;
   MCSymbol *GetJumpTableSymbol(const MachineOperand &MO) const;
   MCSymbol *GetConstantPoolIndexSymbol(const MachineOperand &MO) const;
   MCOperand LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const;
   
+/*
 private:
   MachineModuleInfoMachO &getMachOMMI() const;
  */