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/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);