Simplify the visitation of target expressions. No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211707 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/MC/MCExpr.h

@@ -21,6 +21,7 @@ class MCAssembler;
 class MCContext;
 class MCSection;
 class MCSectionData;
+class MCObjectStreamer;
 class MCSymbol;
 class MCValue;
 class raw_ostream;
@@ -524,7 +525,7 @@ public:
   virtual void PrintImpl(raw_ostream &OS) const = 0;
   virtual bool EvaluateAsRelocatableImpl(MCValue &Res,
                                          const MCAsmLayout *Layout) const = 0;
-  virtual void AddValueSymbols(MCAssembler *) const = 0;
+  virtual void visitUsedExpr(MCObjectStreamer& Streamer) const = 0;
   virtual const MCSection *FindAssociatedSection() const = 0;
 
   virtual void fixELFSymbolsInTLSFixups(MCAssembler &) const = 0;

include/llvm/MC/MCObjectStreamer.h

@@ -78,9 +78,10 @@ protected:
   /// fragment is not a data fragment.
   MCDataFragment *getOrCreateDataFragment() const;
 
-  void AddValueSymbols(const MCExpr *Value);
-
 public:
+  void visitUsedExpr(const MCExpr &Expr);
+  void visitUsedSymbol(const MCSymbol &Sym);
+
   MCAssembler &getAssembler() { return *Assembler; }
 
   /// @name MCStreamer Interface

lib/MC/MCObjectStreamer.cpp

@@ -83,28 +83,32 @@ MCDataFragment *MCObjectStreamer::getOrCreateDataFragment() const {
   return F;
 }
 
-void MCObjectStreamer::AddValueSymbols(const MCExpr *Value) {
+void MCObjectStreamer::visitUsedSymbol(const MCSymbol &Sym) {
-  switch (Value->getKind()) {
+  Assembler->getOrCreateSymbolData(Sym);
+}
+
+void MCObjectStreamer::visitUsedExpr(const MCExpr &Expr) {
+  switch (Expr.getKind()) {
   case MCExpr::Target:
-    cast<MCTargetExpr>(Value)->AddValueSymbols(Assembler);
+    cast<MCTargetExpr>(Expr).visitUsedExpr(*this);
     break;
 
   case MCExpr::Constant:
     break;
 
   case MCExpr::Binary: {
-    const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
+    const MCBinaryExpr &BE = cast<MCBinaryExpr>(Expr);
-    AddValueSymbols(BE->getLHS());
+    visitUsedExpr(*BE.getLHS());
-    AddValueSymbols(BE->getRHS());
+    visitUsedExpr(*BE.getRHS());
     break;
   }
 
   case MCExpr::SymbolRef:
-    Assembler->getOrCreateSymbolData(cast<MCSymbolRefExpr>(Value)->getSymbol());
+    visitUsedSymbol(cast<MCSymbolRefExpr>(Expr).getSymbol());
     break;
 
   case MCExpr::Unary:
-    AddValueSymbols(cast<MCUnaryExpr>(Value)->getSubExpr());
+    visitUsedExpr(*cast<MCUnaryExpr>(Expr).getSubExpr());
     break;
   }
 }
@@ -123,7 +127,7 @@ void MCObjectStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
 
   // Avoid fixups when possible.
   int64_t AbsValue;
-  AddValueSymbols(Value);
+  visitUsedExpr(*Value);
   if (Value->EvaluateAsAbsolute(AbsValue, getAssembler())) {
     EmitIntValue(AbsValue, Size);
     return;
@@ -203,7 +207,7 @@ void MCObjectStreamer::ChangeSection(const MCSection *Section,
 
 void MCObjectStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
   getAssembler().getOrCreateSymbolData(*Symbol);
-  AddValueSymbols(Value);
+  visitUsedExpr(*Value);
   MCStreamer::EmitAssignment(Symbol, Value);
 }
 
@@ -211,7 +215,7 @@ void MCObjectStreamer::EmitInstruction(const MCInst &Inst, const MCSubtargetInfo
   // Scan for values.
   for (unsigned i = Inst.getNumOperands(); i--; )
     if (Inst.getOperand(i).isExpr())
-      AddValueSymbols(Inst.getOperand(i).getExpr());
+      visitUsedExpr(*Inst.getOperand(i).getExpr());
 
   MCSectionData *SD = getCurrentSectionData();
   SD->setHasInstructions(true);

lib/Target/AArch64/MCTargetDesc/AArch64MCExpr.cpp

@@ -16,6 +16,7 @@
 #include "llvm/MC/MCAssembler.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCELF.h"
+#include "llvm/MC/MCObjectStreamer.h"
 #include "llvm/MC/MCSymbol.h"
 #include "llvm/MC/MCValue.h"
 #include "llvm/Object/ELF.h"
@@ -81,37 +82,8 @@ void AArch64MCExpr::PrintImpl(raw_ostream &OS) const {
   OS << *Expr;
 }
 
-// FIXME: This basically copies MCObjectStreamer::AddValueSymbols. Perhaps
+void AArch64MCExpr::visitUsedExpr(MCObjectStreamer &Streamer) const {
-// that method should be made public?
+  Streamer.visitUsedExpr(*getSubExpr());
-// FIXME: really do above: now that two backends are using it.
-static void AddValueSymbolsImpl(const MCExpr *Value, MCAssembler *Asm) {
-  switch (Value->getKind()) {
-  case MCExpr::Target:
-    llvm_unreachable("Can't handle nested target expr!");
-    break;
-
-  case MCExpr::Constant:
-    break;
-
-  case MCExpr::Binary: {
-    const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
-    AddValueSymbolsImpl(BE->getLHS(), Asm);
-    AddValueSymbolsImpl(BE->getRHS(), Asm);
-    break;
-  }
-
-  case MCExpr::SymbolRef:
-    Asm->getOrCreateSymbolData(cast<MCSymbolRefExpr>(Value)->getSymbol());
-    break;
-
-  case MCExpr::Unary:
-    AddValueSymbolsImpl(cast<MCUnaryExpr>(Value)->getSubExpr(), Asm);
-    break;
-  }
-}
-
-void AArch64MCExpr::AddValueSymbols(MCAssembler *Asm) const {
-  AddValueSymbolsImpl(getSubExpr(), Asm);
 }
 
 const MCSection *AArch64MCExpr::FindAssociatedSection() const {

lib/Target/AArch64/MCTargetDesc/AArch64MCExpr.h

@@ -147,7 +147,7 @@ public:
 
   void PrintImpl(raw_ostream &OS) const override;
 
-  void AddValueSymbols(MCAssembler *) const override;
+  void visitUsedExpr(MCObjectStreamer &Streamer) const override;
 
   const MCSection *FindAssociatedSection() const override;
 

lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp

@@ -1160,7 +1160,7 @@ void ARMELFStreamer::EmitPersonalityFixup(StringRef Name) {
   const MCSymbolRefExpr *PersonalityRef = MCSymbolRefExpr::Create(
       PersonalitySym, MCSymbolRefExpr::VK_ARM_NONE, getContext());
 
-  AddValueSymbols(PersonalityRef);
+  visitUsedExpr(*PersonalityRef);
   MCDataFragment *DF = getOrCreateDataFragment();
   DF->getFixups().push_back(MCFixup::Create(DF->getContents().size(),
                                             PersonalityRef,

lib/Target/ARM/MCTargetDesc/ARMMCExpr.cpp

@@ -10,6 +10,7 @@
 #include "ARMMCExpr.h"
 #include "llvm/MC/MCAssembler.h"
 #include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCObjectStreamer.h"
 using namespace llvm;
 
 #define DEBUG_TYPE "armmcexpr"
@@ -41,33 +42,6 @@ ARMMCExpr::EvaluateAsRelocatableImpl(MCValue &Res,
   return false;
 }
 
-// FIXME: This basically copies MCObjectStreamer::AddValueSymbols. Perhaps
+void ARMMCExpr::visitUsedExpr(MCObjectStreamer &Streamer) const {
-// that method should be made public?
+  Streamer.visitUsedExpr(*getSubExpr());
-static void AddValueSymbols_(const MCExpr *Value, MCAssembler *Asm) {
-  switch (Value->getKind()) {
-  case MCExpr::Target:
-    llvm_unreachable("Can't handle nested target expr!");
-
-  case MCExpr::Constant:
-    break;
-
-  case MCExpr::Binary: {
-    const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
-    AddValueSymbols_(BE->getLHS(), Asm);
-    AddValueSymbols_(BE->getRHS(), Asm);
-    break;
-  }
-
-  case MCExpr::SymbolRef:
-    Asm->getOrCreateSymbolData(cast<MCSymbolRefExpr>(Value)->getSymbol());
-    break;
-
-  case MCExpr::Unary:
-    AddValueSymbols_(cast<MCUnaryExpr>(Value)->getSubExpr(), Asm);
-    break;
-  }
-}
-
-void ARMMCExpr::AddValueSymbols(MCAssembler *Asm) const {
-  AddValueSymbols_(getSubExpr(), Asm);
 }

lib/Target/ARM/MCTargetDesc/ARMMCExpr.h

@@ -59,7 +59,7 @@ public:
   void PrintImpl(raw_ostream &OS) const override;
   bool EvaluateAsRelocatableImpl(MCValue &Res,
                                  const MCAsmLayout *Layout) const override;
-  void AddValueSymbols(MCAssembler *) const override;
+  void visitUsedExpr(MCObjectStreamer &Streamer) const override;
   const MCSection *FindAssociatedSection() const override {
     return getSubExpr()->FindAssociatedSection();
   }

lib/Target/Mips/MCTargetDesc/MipsMCExpr.cpp

@@ -11,6 +11,7 @@
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCAssembler.h"
 #include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCObjectStreamer.h"
 
 using namespace llvm;
 
@@ -83,33 +84,6 @@ MipsMCExpr::EvaluateAsRelocatableImpl(MCValue &Res,
   return getSubExpr()->EvaluateAsRelocatable(Res, Layout);
 }
 
-// FIXME: This basically copies MCObjectStreamer::AddValueSymbols. Perhaps
+void MipsMCExpr::visitUsedExpr(MCObjectStreamer &Streamer) const {
-// that method should be made public?
+  Streamer.visitUsedExpr(*getSubExpr());
-static void AddValueSymbolsImpl(const MCExpr *Value, MCAssembler *Asm) {
-  switch (Value->getKind()) {
-  case MCExpr::Target:
-    llvm_unreachable("Can't handle nested target expr!");
-
-  case MCExpr::Constant:
-    break;
-
-  case MCExpr::Binary: {
-    const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
-    AddValueSymbolsImpl(BE->getLHS(), Asm);
-    AddValueSymbolsImpl(BE->getRHS(), Asm);
-    break;
-  }
-
-  case MCExpr::SymbolRef:
-    Asm->getOrCreateSymbolData(cast<MCSymbolRefExpr>(Value)->getSymbol());
-    break;
-
-  case MCExpr::Unary:
-    AddValueSymbolsImpl(cast<MCUnaryExpr>(Value)->getSubExpr(), Asm);
-    break;
-  }
-}
-
-void MipsMCExpr::AddValueSymbols(MCAssembler *Asm) const {
-  AddValueSymbolsImpl(getSubExpr(), Asm);
 }

lib/Target/Mips/MCTargetDesc/MipsMCExpr.h

@@ -49,7 +49,7 @@ public:
   void PrintImpl(raw_ostream &OS) const override;
   bool EvaluateAsRelocatableImpl(MCValue &Res,
                                  const MCAsmLayout *Layout) const override;
-  void AddValueSymbols(MCAssembler *) const override;
+  void visitUsedExpr(MCObjectStreamer &Streamer) const override;
   const MCSection *FindAssociatedSection() const override {
     return getSubExpr()->FindAssociatedSection();
   }

lib/Target/NVPTX/NVPTXMCExpr.h

@@ -66,7 +66,7 @@ public:
                                  const MCAsmLayout *Layout) const override {
     return false;
   }
-  void AddValueSymbols(MCAssembler *) const override {};
+  void visitUsedExpr(MCObjectStreamer &Streamer) const override {};
   const MCSection *FindAssociatedSection() const override {
     return nullptr;
   }

lib/Target/PowerPC/MCTargetDesc/PPCMCExpr.cpp

@@ -11,6 +11,7 @@
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCAssembler.h"
 #include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCObjectStreamer.h"
 
 using namespace llvm;
 
@@ -127,33 +128,6 @@ PPCMCExpr::EvaluateAsRelocatableImpl(MCValue &Res,
   return true;
 }
 
-// FIXME: This basically copies MCObjectStreamer::AddValueSymbols. Perhaps
+void PPCMCExpr::visitUsedExpr(MCObjectStreamer &Streamer) const {
-// that method should be made public?
+  Streamer.visitUsedExpr(*getSubExpr());
-static void AddValueSymbols_(const MCExpr *Value, MCAssembler *Asm) {
-  switch (Value->getKind()) {
-  case MCExpr::Target:
-    llvm_unreachable("Can't handle nested target expr!");
-
-  case MCExpr::Constant:
-    break;
-
-  case MCExpr::Binary: {
-    const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
-    AddValueSymbols_(BE->getLHS(), Asm);
-    AddValueSymbols_(BE->getRHS(), Asm);
-    break;
-  }
-
-  case MCExpr::SymbolRef:
-    Asm->getOrCreateSymbolData(cast<MCSymbolRefExpr>(Value)->getSymbol());
-    break;
-
-  case MCExpr::Unary:
-    AddValueSymbols_(cast<MCUnaryExpr>(Value)->getSubExpr(), Asm);
-    break;
-  }
-}
-
-void PPCMCExpr::AddValueSymbols(MCAssembler *Asm) const {
-  AddValueSymbols_(getSubExpr(), Asm);
 }

lib/Target/PowerPC/MCTargetDesc/PPCMCExpr.h

@@ -79,7 +79,7 @@ public:
   void PrintImpl(raw_ostream &OS) const override;
   bool EvaluateAsRelocatableImpl(MCValue &Res,
                                  const MCAsmLayout *Layout) const override;
-  void AddValueSymbols(MCAssembler *) const override;
+  void visitUsedExpr(MCObjectStreamer &Streamer) const override;
   const MCSection *FindAssociatedSection() const override {
     return getSubExpr()->FindAssociatedSection();
   }

lib/Target/Sparc/MCTargetDesc/SparcMCExpr.cpp

@@ -16,6 +16,7 @@
 #include "llvm/MC/MCAssembler.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCELF.h"
+#include "llvm/MC/MCObjectStreamer.h"
 #include "llvm/MC/MCSymbol.h"
 #include "llvm/Object/ELF.h"
 
@@ -219,35 +220,6 @@ void SparcMCExpr::fixELFSymbolsInTLSFixups(MCAssembler &Asm) const {
   fixELFSymbolsInTLSFixupsImpl(getSubExpr(), Asm);
 }
 
-// FIXME: This basically copies MCObjectStreamer::AddValueSymbols. Perhaps
+void SparcMCExpr::visitUsedExpr(MCObjectStreamer &Streamer) const {
-// that method should be made public?
+  Streamer.visitUsedExpr(*getSubExpr());
-// FIXME: really do above: now that at least three other backends are using it.
-static void AddValueSymbolsImpl(const MCExpr *Value, MCAssembler *Asm) {
-  switch (Value->getKind()) {
-  case MCExpr::Target:
-    llvm_unreachable("Can't handle nested target expr!");
-    break;
-
-  case MCExpr::Constant:
-    break;
-
-  case MCExpr::Binary: {
-    const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
-    AddValueSymbolsImpl(BE->getLHS(), Asm);
-    AddValueSymbolsImpl(BE->getRHS(), Asm);
-    break;
-  }
-
-  case MCExpr::SymbolRef:
-    Asm->getOrCreateSymbolData(cast<MCSymbolRefExpr>(Value)->getSymbol());
-    break;
-
-  case MCExpr::Unary:
-    AddValueSymbolsImpl(cast<MCUnaryExpr>(Value)->getSubExpr(), Asm);
-    break;
-  }
-}
-
-void SparcMCExpr::AddValueSymbols(MCAssembler *Asm) const {
-  AddValueSymbolsImpl(getSubExpr(), Asm);
 }

lib/Target/Sparc/MCTargetDesc/SparcMCExpr.h

@@ -88,7 +88,7 @@ public:
   void PrintImpl(raw_ostream &OS) const override;
   bool EvaluateAsRelocatableImpl(MCValue &Res,
                                  const MCAsmLayout *Layout) const override;
-  void AddValueSymbols(MCAssembler *) const override;
+  void visitUsedExpr(MCObjectStreamer &Streamer) const override;
   const MCSection *FindAssociatedSection() const override {
     return getSubExpr()->FindAssociatedSection();
   }