[AsmPrinter] Remove const qualifier from EmitBasicBlockStart.

Overriders may want to modify state in it. AMDGPU wants
to, but has to make its members mutable in order to do so.

Besides, EmitBasicBlockEnd is not const, so why should
Start be?

Patch by Bevin Hansson.

Reviewed By: nickdesaulniers

Differential Revision: https://reviews.llvm.org/D66341

llvm-svn: 369325

include/llvm/CodeGen/AsmPrinter.h

@@ -400,7 +400,7 @@ public:
   /// By default, this method prints the label for the specified
   /// MachineBasicBlock, an alignment (if present) and a comment describing it
   /// if appropriate.
-  virtual void EmitBasicBlockStart(const MachineBasicBlock &MBB) const;
+  virtual void EmitBasicBlockStart(const MachineBasicBlock &MBB);
 
   /// Targets can override this to emit stuff at the end of a basic block.
   virtual void EmitBasicBlockEnd(const MachineBasicBlock &MBB);

lib/CodeGen/AsmPrinter/AsmPrinter.cpp

@@ -2895,7 +2895,7 @@ void AsmPrinter::setupCodePaddingContext(const MachineBasicBlock &MBB,
 /// EmitBasicBlockStart - This method prints the label for the specified
 /// MachineBasicBlock, an alignment (if present) and a comment describing
 /// it if appropriate.
-void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock &MBB) const {
+void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock &MBB) {
   // End the previous funclet and start a new one.
   if (MBB.isEHFuncletEntry()) {
     for (const HandlerInfo &HI : Handlers) {

lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp

@@ -273,7 +273,7 @@ void AMDGPUAsmPrinter::EmitFunctionEntryLabel() {
   AsmPrinter::EmitFunctionEntryLabel();
 }
 
-void AMDGPUAsmPrinter::EmitBasicBlockStart(const MachineBasicBlock &MBB) const {
+void AMDGPUAsmPrinter::EmitBasicBlockStart(const MachineBasicBlock &MBB) {
   if (DumpCodeInstEmitter && !isBlockOnlyReachableByFallthrough(&MBB)) {
     // Write a line for the basic block label if it is not only fallthrough.
     DisasmLines.push_back(

lib/Target/AMDGPU/AMDGPUAsmPrinter.h

@@ -125,7 +125,7 @@ public:
 
   void EmitFunctionEntryLabel() override;
 
-  void EmitBasicBlockStart(const MachineBasicBlock &MBB) const override;
+  void EmitBasicBlockStart(const MachineBasicBlock &MBB) override;
 
   void EmitGlobalVariable(const GlobalVariable *GV) override;
 
@@ -140,8 +140,8 @@ public:
                        const char *ExtraCode, raw_ostream &O) override;
 
 protected:
-  mutable std::vector<std::string> DisasmLines, HexLines;
-  mutable size_t DisasmLineMaxLen;
+  std::vector<std::string> DisasmLines, HexLines;
+  size_t DisasmLineMaxLen;
 };
 
 } // end namespace llvm

lib/Target/NVPTX/NVPTXAsmPrinter.cpp

@@ -434,7 +434,7 @@ bool NVPTXAsmPrinter::isLoopHeaderOfNoUnroll(
   return false;
 }
 
-void NVPTXAsmPrinter::EmitBasicBlockStart(const MachineBasicBlock &MBB) const {
+void NVPTXAsmPrinter::EmitBasicBlockStart(const MachineBasicBlock &MBB) {
   AsmPrinter::EmitBasicBlockStart(MBB);
   if (isLoopHeaderOfNoUnroll(MBB))
     OutStreamer->EmitRawText(StringRef("\t.pragma \"nounroll\";\n"));

lib/Target/NVPTX/NVPTXAsmPrinter.h

@@ -200,7 +200,7 @@ private:
   const Function *F;
   std::string CurrentFnName;
 
-  void EmitBasicBlockStart(const MachineBasicBlock &MBB) const override;
+  void EmitBasicBlockStart(const MachineBasicBlock &MBB) override;
   void EmitFunctionEntryLabel() override;
   void EmitFunctionBodyStart() override;
   void EmitFunctionBodyEnd() override;