Support creating a constant pool value for a machine basic block.

This is used when we want to take the address of a machine basic block, but it's
not associated with a BB in LLVM IR.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140823 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/ARMConstantPoolValue.cpp

@@ -17,6 +17,7 @@
 #include "llvm/Constants.h"
 #include "llvm/GlobalValue.h"
 #include "llvm/Type.h"
+#include "llvm/CodeGen/MachineBasicBlock.h"
 #include "llvm/Support/raw_ostream.h"
 #include <cstdlib>
 using namespace llvm;
@@ -30,6 +31,17 @@ ARMConstantPoolValue::ARMConstantPoolValue(const Constant *cval, unsigned id,
     CVal(cval), S(NULL), LabelId(id), Kind(K), PCAdjust(PCAdj),
     Modifier(Modif), AddCurrentAddress(AddCA) {}
 
+ARMConstantPoolValue::ARMConstantPoolValue(LLVMContext &C,
+                                           const MachineBasicBlock *mbb,
+                                           unsigned id,
+                                           ARMCP::ARMCPKind K,
+                                           unsigned char PCAdj,
+                                           ARMCP::ARMCPModifier Modif,
+                                           bool AddCA)
+  : MachineConstantPoolValue((Type*)Type::getInt8PtrTy(C)),
+    CVal(NULL), MBB(mbb), S(NULL), LabelId(id), Kind(K), PCAdjust(PCAdj),
+    Modifier(Modif), AddCurrentAddress(AddCA) {}
+
 ARMConstantPoolValue::ARMConstantPoolValue(LLVMContext &C,
                                            const char *s, unsigned id,
                                            unsigned char PCAdj,
@@ -53,6 +65,10 @@ const BlockAddress *ARMConstantPoolValue::getBlockAddress() const {
   return dyn_cast_or_null<BlockAddress>(CVal);
 }
 
+const MachineBasicBlock *ARMConstantPoolValue::getMBB() const {
+  return MBB;
+}
+
 static bool CPV_streq(const char *S1, const char *S2) {
   if (S1 == S2)
     return true;
@@ -119,6 +135,8 @@ void ARMConstantPoolValue::dump() const {
 void ARMConstantPoolValue::print(raw_ostream &O) const {
   if (CVal)
     O << CVal->getName();
+  else if (MBB)
+    O << "";
   else
     O << S;
   if (Modifier) O << "(" << getModifierText() << ")";

lib/Target/ARM/ARMConstantPoolValue.h

@@ -20,17 +20,19 @@
 
 namespace llvm {
 
-class Constant;
 class BlockAddress;
+class Constant;
 class GlobalValue;
 class LLVMContext;
+class MachineBasicBlock;
 
 namespace ARMCP {
   enum ARMCPKind {
     CPValue,
     CPExtSymbol,
     CPBlockAddress,
-    CPLSDA
+    CPLSDA,
+    CPMachineBasicBlock
   };
 
   enum ARMCPModifier {
@@ -48,6 +50,7 @@ namespace ARMCP {
 /// instruction and the constant being loaded, i.e. (&GV-(LPIC+8)).
 class ARMConstantPoolValue : public MachineConstantPoolValue {
   const Constant *CVal;    // Constant being loaded.
+  const MachineBasicBlock *MBB; // MachineBasicBlock being loaded.
   const char *S;           // ExtSymbol being loaded.
   unsigned LabelId;        // Label id of the load.
   ARMCP::ARMCPKind Kind;   // Kind of constant.
@@ -62,6 +65,11 @@ public:
                        unsigned char PCAdj = 0,
                        ARMCP::ARMCPModifier Modifier = ARMCP::no_modifier,
                        bool AddCurrentAddress = false);
+  ARMConstantPoolValue(LLVMContext &C, const MachineBasicBlock *mbb,unsigned id,
+                       ARMCP::ARMCPKind Kind = ARMCP::CPValue,
+                       unsigned char PCAdj = 0,
+                       ARMCP::ARMCPModifier Modifier = ARMCP::no_modifier,
+                       bool AddCurrentAddress = false);
   ARMConstantPoolValue(LLVMContext &C, const char *s, unsigned id,
                        unsigned char PCAdj = 0,
                        ARMCP::ARMCPModifier Modifier = ARMCP::no_modifier,
@@ -73,6 +81,7 @@ public:
   const GlobalValue *getGV() const;
   const char *getSymbol() const { return S; }
   const BlockAddress *getBlockAddress() const;
+  const MachineBasicBlock *getMBB() const;
   ARMCP::ARMCPModifier getModifier() const { return Modifier; }
   const char *getModifierText() const {
     switch (Modifier) {
@@ -95,6 +104,7 @@ public:
   bool isExtSymbol() const { return Kind == ARMCP::CPExtSymbol; }
   bool isBlockAddress() { return Kind == ARMCP::CPBlockAddress; }
   bool isLSDA() { return Kind == ARMCP::CPLSDA; }
+  bool isMachineBasicBlock() { return Kind == ARMCP::CPMachineBasicBlock; }
 
   virtual unsigned getRelocationInfo() const { return 2; }