Handle ARM machine constantpool entries.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58671 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/ARMCodeEmitter.cpp

@@ -158,7 +158,7 @@ bool ARMCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
   TD = ((ARMTargetMachine&)MF.getTarget()).getTargetData();
   JTI = ((ARMTargetMachine&)MF.getTarget()).getJITInfo();
   MCPEs = &MF.getConstantPool()->getConstants();
-  JTI->ResizeConstPoolMap(MCPEs->size());
+  JTI->Initialize(MCPEs);
 
   do {
     DOUT << "JITTing function '" << MF.getFunction()->getName() << "'\n";
@@ -257,7 +257,7 @@ void ARMCodeEmitter::emitMachineBasicBlock(MachineBasicBlock *BB) {
 }
 
 void ARMCodeEmitter::emitInstruction(const MachineInstr &MI) {
-  DOUT << "JIT: " << "0x" << MCE.getCurrentPCValue() << ":\t" << MI;
+  DOUT << "JIT: " << (void*)MCE.getCurrentPCValue() << ":\t" << MI;
 
   NumEmitted++;  // Keep track of the # of mi's emitted
   if ((MI.getDesc().TSFlags & ARMII::FormMask) == ARMII::Pseudo)
@@ -286,8 +286,10 @@ void ARMCodeEmitter::emitConstPoolInstruction(const MachineInstr &MI) {
     GlobalValue *GV = ACPV->getGV();
     if (GV) {
       assert(!ACPV->isStub() && "Don't know how to deal this yet!");
-      emitGlobalAddress(GV, ARM::reloc_arm_absolute, false);
-    } else  {
+      MCE.addRelocation(MachineRelocation::getGV(MCE.getCurrentPCOffset(),
+                                                ARM::reloc_arm_machine_cp_entry,
+                                                GV, CPIndex, false));
+     } else  {
       assert(!ACPV->isNonLazyPointer() && "Don't know how to deal this yet!");
       emitExternalSymbolAddress(ACPV->getSymbol(), ARM::reloc_arm_absolute);
     }
@@ -320,6 +322,12 @@ void ARMCodeEmitter::emitPseudoInstruction(const MachineInstr &MI) {
     emitConstPoolInstruction(MI);
     break;
   case ARM::PICADD: {
+    // Remember of the address of the PC label for relocation later.
+    const MachineOperand &MO2 = MI.getOperand(2);
+    DOUT << "\t** LPC" << MO2.getImm() << " @ "
+         << (void*)MCE.getCurrentPCValue() << '\n';
+    JTI->addPCLabelAddr(MO2.getImm(), MCE.getCurrentPCValue());
+
     // PICADD is just an add instruction that implicitly read pc.
     unsigned Binary = getBinaryCodeForInstr(MI);
     const TargetInstrDesc &TID = MI.getDesc();

lib/Target/ARM/ARMConstantPoolValue.cpp

@@ -93,10 +93,8 @@ void ARMConstantPoolValue::print(raw_ostream &O) const {
   else if (isStub()) O << "$stub";
   if (Modifier) O << "(" << Modifier << ")";
   if (PCAdjust != 0) {
-    O << "-(LPIC" << LabelId << "+"
-      << (unsigned)PCAdjust;
-    if (AddCurrentAddress)
-      O << "-.";
+    O << "-(LPC" << LabelId << "+" << (unsigned)PCAdjust;
+    if (AddCurrentAddress) O << "-.";
     O << ")";
   }
 }

lib/Target/ARM/ARMJITInfo.cpp

@@ -13,6 +13,7 @@
 
 #define DEBUG_TYPE "jit"
 #include "ARMJITInfo.h"
+#include "ARMConstantPoolValue.h"
 #include "ARMRelocations.h"
 #include "ARMSubtarget.h"
 #include "llvm/Function.h"
@@ -167,6 +168,25 @@ void *ARMJITInfo::emitFunctionStub(const Function* F, void *Fn,
   return MCE.finishFunctionStub(F);
 }
 
+intptr_t ARMJITInfo::resolveRelocationAddr(MachineRelocation *MR) const {
+  ARM::RelocationType RT = (ARM::RelocationType)MR->getRelocationType();
+  if (RT == ARM::reloc_arm_cp_entry)
+    return getConstantPoolEntryAddr(MR->getConstantPoolIndex());
+  else if (RT == ARM::reloc_arm_machine_cp_entry) {
+    const MachineConstantPoolEntry &MCPE = (*MCPEs)[MR->getConstantVal()];
+    assert(MCPE.isMachineConstantPoolEntry() &&
+           "Expecting a machine constant pool entry!");
+    ARMConstantPoolValue *ACPV =
+      static_cast<ARMConstantPoolValue*>(MCPE.Val.MachineCPVal);
+    assert((!ACPV->hasModifier() && !ACPV->mustAddCurrentAddress()) &&
+           "Can't handle this machine constant pool entry yet!");
+    intptr_t Addr = (intptr_t)(MR->getResultPointer());
+    Addr -= getPCLabelAddr(ACPV->getLabelId()) + ACPV->getPCAdjustment();
+    return Addr;
+  }
+  return (intptr_t)(MR->getResultPointer());
+}
+
 /// relocate - Before the JIT can run a block of code that has been emitted,
 /// it must rewrite the code to contain the actual addresses of any
 /// referenced global symbols.
@@ -174,12 +194,9 @@ void ARMJITInfo::relocate(void *Function, MachineRelocation *MR,
                           unsigned NumRelocs, unsigned char* GOTBase) {
   for (unsigned i = 0; i != NumRelocs; ++i, ++MR) {
     void *RelocPos = (char*)Function + MR->getMachineCodeOffset();
-    ARM::RelocationType RT = (ARM::RelocationType)MR->getRelocationType();
     // If this is a constpool relocation, get the address of the
     // constpool_entry instruction.
-    intptr_t ResultPtr = (RT == ARM::reloc_arm_cp_entry)
-      ? getConstantPoolEntryAddr(MR->getConstantPoolIndex())
-      : (intptr_t)MR->getResultPointer();
+    intptr_t ResultPtr = resolveRelocationAddr(MR);
     switch ((ARM::RelocationType)MR->getRelocationType()) {
     case ARM::reloc_arm_cp_entry:
     case ARM::reloc_arm_relative: {
@@ -190,18 +207,20 @@ void ARMJITInfo::relocate(void *Function, MachineRelocation *MR,
       if (ResultPtr >= 0)
         *((unsigned*)RelocPos) |= 1 << 23;
       else {
-      // otherwise, obtain the absolute value and set
+      // Otherwise, obtain the absolute value and set
       // bit U(23) to 0.
         ResultPtr *= -1;
         *((unsigned*)RelocPos) &= 0xFF7FFFFF;
       }
-      // set the immed value calculated
+      // Set the immed value calculated.
       *((unsigned*)RelocPos) |= (unsigned)ResultPtr;
-      // set register Rn to PC
+      // Set register Rn to PC.
       *((unsigned*)RelocPos) |= 0xF << 16;
       break;
     }
+    case ARM::reloc_arm_machine_cp_entry:
     case ARM::reloc_arm_absolute: {
+      // These addresses have already been resolved.
       *((unsigned*)RelocPos) += (unsigned)ResultPtr;
       break;
     }

lib/Target/ARM/ARMJITInfo.h

@@ -15,6 +15,8 @@
 #define ARMJITINFO_H
 
 #include "llvm/Target/TargetJITInfo.h"
+#include "llvm/CodeGen/MachineConstantPool.h"
+#include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/SmallVector.h"
 
 namespace llvm {
@@ -23,10 +25,17 @@ namespace llvm {
   class ARMJITInfo : public TargetJITInfo {
     ARMTargetMachine &TM;
 
+    // MCPEs - List of the constant pool entries for the current machine
+    // function that's being processed.
+    const std::vector<MachineConstantPoolEntry> *MCPEs;
+
     // ConstPoolId2AddrMap - A map from constant pool ids to the corresponding
     // CONSTPOOL_ENTRY addresses.
     SmallVector<intptr_t, 32> ConstPoolId2AddrMap;
 
+    // PCLabelMap - A map from PC labels to addresses.
+    DenseMap<unsigned, intptr_t> PCLabelMap;
+
   public:
     explicit ARMJITInfo(ARMTargetMachine &tm) : TM(tm) { useGOT = false; }
 
@@ -51,15 +60,16 @@ namespace llvm {
     /// referenced global symbols.
     virtual void relocate(void *Function, MachineRelocation *MR,
                           unsigned NumRelocs, unsigned char* GOTBase);
-  
+
     /// hasCustomConstantPool - Allows a target to specify that constant
     /// pool address resolution is handled by the target.
     virtual bool hasCustomConstantPool() const { return true; }
 
-    /// ResizeConstPoolMap - Resize constant pool ids to CONSTPOOL_ENTRY
-    /// addresses map.
-    void ResizeConstPoolMap(unsigned Size) {
-      ConstPoolId2AddrMap.resize(Size);
+    /// Initialize - Initialize internal stage. Get the list of constant pool
+    /// Resize constant pool ids to CONSTPOOL_ENTRY addresses map.
+    void Initialize(const std::vector<MachineConstantPoolEntry> *mcpes) {
+      MCPEs = mcpes;
+      ConstPoolId2AddrMap.resize(MCPEs->size());
     }
 
     /// getConstantPoolEntryAddr - The ARM target puts all constant
@@ -77,6 +87,24 @@ namespace llvm {
       assert(CPI < ConstPoolId2AddrMap.size());
       ConstPoolId2AddrMap[CPI] = Addr;
     }
+
+    /// getPCLabelAddr - Retrieve the address of the PC label of the specified id.
+    intptr_t getPCLabelAddr(unsigned Id) const {
+      DenseMap<unsigned, intptr_t>::const_iterator I = PCLabelMap.find(Id);
+      assert(I != PCLabelMap.end());
+      return I->second;
+    }
+
+    /// addPCLabelAddr - Remember the address of the specified PC label.
+    void addPCLabelAddr(unsigned Id, intptr_t Addr) {
+      PCLabelMap.insert(std::make_pair(Id, Addr));
+    }
+
+  private:
+    /// resolveRelocationAddr - Resolve the resulting address of the relocation
+    /// if it's not already solved. Constantpool entries must be resolved by
+    /// ARM target.
+    intptr_t resolveRelocationAddr(MachineRelocation *MR) const;
   };
 }
 

lib/Target/ARM/ARMRelocations.h

@@ -31,6 +31,10 @@ namespace llvm {
       // addresses are kept locally in a map.
       reloc_arm_cp_entry,
 
+      // reloc_arm_machine_cp_entry - Relocation of a ARM machine constantpool
+      // entry.
+      reloc_arm_machine_cp_entry,
+
       // reloc_arm_branch - Branch address relocation.
       reloc_arm_branch
     };