fix AsmPrinter::GetBlockAddressSymbol to always return a unique

label instead of trying to form one based on the BB name (which
causes collisions if the name is empty).  This fixes PR6608


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98495 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/AsmPrinter.h

@@ -337,8 +337,7 @@ namespace llvm {
     /// GetBlockAddressSymbol - Return the MCSymbol used to satisfy BlockAddress
     /// uses of the specified basic block.
     MCSymbol *GetBlockAddressSymbol(const BlockAddress *BA) const;
-    MCSymbol *GetBlockAddressSymbol(const Function *F,
-                                    const BasicBlock *BB) const;
+    MCSymbol *GetBlockAddressSymbol(const BasicBlock *BB) const;
 
     /// EmitBasicBlockStart - This method prints the label for the specified
     /// MachineBasicBlock, an alignment (if present) and a comment describing

include/llvm/CodeGen/MachineModuleInfo.h

@@ -139,6 +139,11 @@ class MachineModuleInfo : public ImmutablePass {
   /// llvm.compiler.used.
   SmallPtrSet<const Function *, 32> UsedFunctions;
 
+  
+  /// AddrLabelSymbols - This map keeps track of which symbol is being used for
+  /// the specified basic block's address of label.
+  DenseMap<AssertingVH<BasicBlock>, MCSymbol*> AddrLabelSymbols;
+  
   bool CallsEHReturn;
   bool CallsUnwindInit;
  
@@ -203,6 +208,11 @@ public:
   /// handling comsumers.
   std::vector<MachineMove> &getFrameMoves() { return FrameMoves; }
   
+  /// getAddrLabelSymbol - Return the symbol to be used for the specified basic
+  /// block when its address is taken.  This cannot be its normal LBB label
+  /// because the block may be accessed outside its containing function.
+  MCSymbol *getAddrLabelSymbol(const BasicBlock *BB);
+  
   //===- EH ---------------------------------------------------------------===//
 
   /// getOrCreateLandingPadInfo - Find or create an LandingPadInfo for the

lib/CodeGen/AsmPrinter/AsmPrinter.cpp

@@ -1580,28 +1580,11 @@ bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
 }
 
 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA) const {
-  return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock());
+  return MMI->getAddrLabelSymbol(BA->getBasicBlock());
 }
 
-MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F,
-                                            const BasicBlock *BB) const {
-  assert(BB->hasName() &&
-         "Address of anonymous basic block not supported yet!");
-
-  // This code must use the function name itself, and not the function number,
-  // since it must be possible to generate the label name from within other
-  // functions.
-  SmallString<60> FnName;
-  Mang->getNameWithPrefix(FnName, F, false);
-
-  // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME!
-  SmallString<60> NameResult;
-  Mang->getNameWithPrefix(NameResult,
-                          StringRef("BA") + Twine((unsigned)FnName.size()) + 
-                          "_" + FnName.str() + "_" + BB->getName(), 
-                          Mangler::Private);
-
-  return OutContext.GetOrCreateTemporarySymbol(NameResult.str());
+MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BasicBlock *BB) const {
+  return MMI->getAddrLabelSymbol(BB);
 }
 
 /// GetCPISymbol - Return the symbol for the specified constant pool entry.
@@ -1730,7 +1713,7 @@ void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
     const BasicBlock *BB = MBB->getBasicBlock();
     if (VerboseAsm)
       OutStreamer.AddComment("Address Taken");
-    OutStreamer.EmitLabel(GetBlockAddressSymbol(BB->getParent(), BB));
+    OutStreamer.EmitLabel(GetBlockAddressSymbol(BB));
   }
 
   // Print the main label for the block.

lib/CodeGen/MachineModuleInfo.cpp

@@ -104,6 +104,18 @@ void MachineModuleInfo::AnalyzeModule(Module &M) {
       UsedFunctions.insert(F);
 }
 
+/// getAddrLabelSymbol - Return the symbol to be used for the specified basic
+/// block when its address is taken.  This cannot be its normal LBB label
+/// because the block may be accessed outside its containing function.
+MCSymbol *MachineModuleInfo::getAddrLabelSymbol(const BasicBlock *BB) {
+  assert(BB->hasAddressTaken() &&
+         "Shouldn't get label for block without address taken");
+  MCSymbol *&Entry = AddrLabelSymbols[const_cast<BasicBlock*>(BB)];
+  if (Entry) return Entry;
+  return Entry = Context.CreateTempSymbol();
+}
+
+
 //===-EH-------------------------------------------------------------------===//
 
 /// getOrCreateLandingPadInfo - Find or create an LandingPadInfo for the

lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp

@@ -2035,6 +2035,8 @@ SelectCodeCommon(SDNode *NodeToMatch, const unsigned char *MatcherTable,
   case ISD::EntryToken:       // These nodes remain the same.
   case ISD::BasicBlock:
   case ISD::Register:
+  //case ISD::VALUETYPE:
+  //case ISD::CONDCODE:
   case ISD::HANDLENODE:
   case ISD::TargetConstant:
   case ISD::TargetConstantFP:

test/CodeGen/ARM/indirectbr.ll

@@ -59,6 +59,6 @@ L1:                                               ; preds = %L2, %bb2
   store i8* blockaddress(@foo, %L5), i8** @nextaddr, align 4
   ret i32 %res.3
 }
-; ARM: .long L_BA4__foo_L5-(LPC{{.*}}+8)
-; THUMB: .long L_BA4__foo_L5-(LPC{{.*}}+4)
-; THUMB2: .long L_BA4__foo_L5
+; ARM: .long Ltmp0-(LPC{{.*}}+8)
+; THUMB: .long Ltmp0-(LPC{{.*}}+4)
+; THUMB2: .long Ltmp0

test/CodeGen/PowerPC/indirectbr.ll

@@ -43,12 +43,12 @@ L2:                                               ; preds = %L3, %bb2
 
 L1:                                               ; preds = %L2, %bb2
   %res.3 = phi i32 [ %phitmp, %L2 ], [ 2, %bb2 ]  ; <i32> [#uses=1]
-; PIC: addis r4, r4, ha16(L_BA4__foo_L5-"L1$pb")
-; PIC: li r6, lo16(L_BA4__foo_L5-"L1$pb")
+; PIC: addis r4, r4, ha16(Ltmp0-"L1$pb")
+; PIC: li r6, lo16(Ltmp0-"L1$pb")
 ; PIC: add r4, r4, r6
 ; PIC: stw r4
-; STATIC: li r5, lo16(L_BA4__foo_L5)
-; STATIC: addis r5, r5, ha16(L_BA4__foo_L5)
+; STATIC: li r5, lo16(Ltmp0)
+; STATIC: addis r5, r5, ha16(Ltmp0)
 ; STATIC: stw r5
   store i8* blockaddress(@foo, %L5), i8** @nextaddr, align 4
   ret i32 %res.3

test/CodeGen/XCore/indirectbr.ll

@@ -38,7 +38,7 @@ L2:                                               ; preds = %L3, %bb2
 
 L1:                                               ; preds = %L2, %bb2
   %res.3 = phi i32 [ %phitmp, %L2 ], [ 2, %bb2 ]  ; <i32> [#uses=1]
-; CHECK: ldap r11, .LBA3_foo_L5
+; CHECK: ldap r11, .Ltmp0
 ; CHECK: stw r11, dp[nextaddr]
   store i8* blockaddress(@foo, %L5), i8** @nextaddr, align 4
   ret i32 %res.3