"Minor LSR debugging stuff"

[oota-llvm.git] / lib / Target / TargetLoweringObjectFile.cpp

diff --git a/lib/Target/TargetLoweringObjectFile.cpp b/lib/Target/TargetLoweringObjectFile.cpp
index dd7b532bbfbaef701376d24ce1aea43711b8ea63..fc8b67b00180992ff40ff29561400cfb8b8218f0 100644 (file)
--- a/lib/Target/TargetLoweringObjectFile.cpp
+++ b/lib/Target/TargetLoweringObjectFile.cpp
@@ -35,39 +35,21 @@ using namespace llvm;
 //                              Generic Code
 //===----------------------------------------------------------------------===//
 
-TargetLoweringObjectFile::TargetLoweringObjectFile() : Ctx(0) {
-  TextSection = 0;
-  DataSection = 0;
-  BSSSection = 0;
-  ReadOnlySection = 0;
-  StaticCtorSection = 0;
-  StaticDtorSection = 0;
-  LSDASection = 0;
-  EHFrameSection = 0;
-
-  DwarfAbbrevSection = 0;
-  DwarfInfoSection = 0;
-  DwarfLineSection = 0;
-  DwarfFrameSection = 0;
-  DwarfPubNamesSection = 0;
-  DwarfPubTypesSection = 0;
-  DwarfDebugInlineSection = 0;
-  DwarfStrSection = 0;
-  DwarfLocSection = 0;
-  DwarfARangesSection = 0;
-  DwarfRangesSection = 0;
-  DwarfMacroInfoSection = 0;
-  
-  IsFunctionEHSymbolGlobal = false;
-  IsFunctionEHFrameSymbolPrivate = true;
-  SupportsWeakOmittedEHFrame = true;
+/// Initialize - this method must be called before any actual lowering is
+/// done.  This specifies the current context for codegen, and gives the
+/// lowering implementations a chance to set up their default sections.
+void TargetLoweringObjectFile::Initialize(MCContext &ctx,
+                                          const TargetMachine &TM) {
+  Ctx = &ctx;
+  InitMCObjectFileInfo(TM.getTargetTriple(),
+                       TM.getRelocationModel(), TM.getCodeModel(), *Ctx);
 }
-
+  
 TargetLoweringObjectFile::~TargetLoweringObjectFile() {
 }
 
-static bool isSuitableForBSS(const GlobalVariable *GV) {
-  Constant *C = GV->getInitializer();
+static bool isSuitableForBSS(const GlobalVariable *GV, bool NoZerosInBSS) {
+  const Constant *C = GV->getInitializer();
 
   // Must have zero initializer.
   if (!C->isNullValue())
@@ -93,7 +75,7 @@ static bool isSuitableForBSS(const GlobalVariable *GV) {
 /// known to have a type that is an array of 1/2/4 byte elements) ends with a
 /// nul value and contains no other nuls in it.
 static bool IsNullTerminatedString(const Constant *C) {
-  const ArrayType *ATy = cast<ArrayType>(C->getType());
+  ArrayType *ATy = cast<ArrayType>(C->getType());
 
   // First check: is we have constant array of i8 terminated with zero
   if (const ConstantArray *CVA = dyn_cast<ConstantArray>(C)) {
@@ -120,6 +102,18 @@ static bool IsNullTerminatedString(const Constant *C) {
   return false;
 }
 
+MCSymbol *TargetLoweringObjectFile::
+getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang,
+                        MachineModuleInfo *MMI) const {
+  return Mang->getSymbol(GV);
+}
+
+void TargetLoweringObjectFile::emitPersonalityValue(MCStreamer &Streamer,
+                                                    const TargetMachine &TM,
+                                                    const MCSymbol *Sym) const {
+}
+
+
 /// getKindForGlobal - This is a top-level target-independent classifier for
 /// a global variable.  Given an global variable and information from TM, it
 /// classifies the global in a variety of ways that make various target
@@ -139,7 +133,7 @@ SectionKind TargetLoweringObjectFile::getKindForGlobal(const GlobalValue *GV,
 
   // Handle thread-local data first.
   if (GVar->isThreadLocal()) {
-    if (isSuitableForBSS(GVar))
+    if (isSuitableForBSS(GVar, TM.Options.NoZerosInBSS))
       return SectionKind::getThreadBSS();
     return SectionKind::getThreadData();
   }
@@ -149,7 +143,7 @@ SectionKind TargetLoweringObjectFile::getKindForGlobal(const GlobalValue *GV,
     return SectionKind::getCommon();
 
   // Variable can be easily put to BSS section.
-  if (isSuitableForBSS(GVar)) {
+  if (isSuitableForBSS(GVar, TM.Options.NoZerosInBSS)) {
     if (GVar->hasLocalLinkage())
       return SectionKind::getBSSLocal();
     else if (GVar->hasExternalLinkage())
@@ -157,7 +151,7 @@ SectionKind TargetLoweringObjectFile::getKindForGlobal(const GlobalValue *GV,
     return SectionKind::getBSS();
   }
 
-  Constant *C = GVar->getInitializer();
+  const Constant *C = GVar->getInitializer();
 
   // If the global is marked constant, we can put it into a mergable section,
   // a mergable string section, or general .data if it contains relocations.
@@ -168,10 +162,16 @@ SectionKind TargetLoweringObjectFile::getKindForGlobal(const GlobalValue *GV,
     switch (C->getRelocationInfo()) {
     default: assert(0 && "unknown relocation info kind");
     case Constant::NoRelocation:
+      // If the global is required to have a unique address, it can't be put
+      // into a mergable section: just drop it into the general read-only
+      // section instead.
+      if (!GVar->hasUnnamedAddr())
+        return SectionKind::getReadOnly();
+        
       // If initializer is a null-terminated string, put it in a "cstring"
       // section of the right width.
-      if (const ArrayType *ATy = dyn_cast<ArrayType>(C->getType())) {
-        if (const IntegerType *ITy =
+      if (ArrayType *ATy = dyn_cast<ArrayType>(C->getType())) {
+        if (IntegerType *ITy =
               dyn_cast<IntegerType>(ATy->getElementType())) {
           if ((ITy->getBitWidth() == 8 || ITy->getBitWidth() == 16 ||
                ITy->getBitWidth() == 32) &&
@@ -299,16 +299,15 @@ getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
                                MachineModuleInfo *MMI, unsigned Encoding,
                                MCStreamer &Streamer) const {
   const MCSymbol *Sym = Mang->getSymbol(GV);
-  return getExprForDwarfReference(Sym, Mang, MMI, Encoding, Streamer);
+  return getExprForDwarfReference(Sym, Encoding, Streamer);
 }
 
 const MCExpr *TargetLoweringObjectFile::
-getExprForDwarfReference(const MCSymbol *Sym, Mangler *Mang,
-                         MachineModuleInfo *MMI, unsigned Encoding,
+getExprForDwarfReference(const MCSymbol *Sym, unsigned Encoding,
                          MCStreamer &Streamer) const {
   const MCExpr *Res = MCSymbolRefExpr::Create(Sym, getContext());
 
-  switch (Encoding & 0xF0) {
+  switch (Encoding & 0x70) {
   default:
     report_fatal_error("We do not support this DWARF encoding yet!");
   case dwarf::DW_EH_PE_absptr:
@@ -324,20 +323,3 @@ getExprForDwarfReference(const MCSymbol *Sym, Mangler *Mang,
   }
   }
 }
-
-unsigned TargetLoweringObjectFile::getPersonalityEncoding() const {
-  return dwarf::DW_EH_PE_absptr;
-}
-
-unsigned TargetLoweringObjectFile::getLSDAEncoding() const {
-  return dwarf::DW_EH_PE_absptr;
-}
-
-unsigned TargetLoweringObjectFile::getFDEEncoding() const {
-  return dwarf::DW_EH_PE_absptr;
-}
-
-unsigned TargetLoweringObjectFile::getTTypeEncoding() const {
-  return dwarf::DW_EH_PE_absptr;
-}
-