X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FTarget%2FTargetLoweringObjectFile.cpp;h=b74a0bd25d72fd75a42a302375ce696583b29516;hb=a0708d1109c2c1a3cf911a4761a10ad69a28455e;hp=2fb744f5bf4e2074506a44381657fb02db5762e9;hpb=e76a33b9567d78a5744dc52fcec3a6056d6fb576;p=oota-llvm.git

diff --git a/lib/Target/TargetLoweringObjectFile.cpp b/lib/Target/TargetLoweringObjectFile.cpp
index 2fb744f5bf4..b74a0bd25d7 100644
--- a/lib/Target/TargetLoweringObjectFile.cpp
+++ b/lib/Target/TargetLoweringObjectFile.cpp
@@ -28,7 +28,6 @@
 #include "llvm/Support/Dwarf.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/raw_ostream.h"
-#include "llvm/ADT/SmallString.h"
 using namespace llvm;
 
 //===----------------------------------------------------------------------===//
@@ -41,13 +40,14 @@ using namespace llvm;
 void TargetLoweringObjectFile::Initialize(MCContext &ctx,
                                           const TargetMachine &TM) {
   Ctx = &ctx;
-  InitMCObjectFileInfo(TM.getTargetTriple(), TM.getRelocationModel(), *Ctx);
+  InitMCObjectFileInfo(TM.getTargetTriple(),
+                       TM.getRelocationModel(), TM.getCodeModel(), *Ctx);
 }
   
 TargetLoweringObjectFile::~TargetLoweringObjectFile() {
 }
 
-static bool isSuitableForBSS(const GlobalVariable *GV) {
+static bool isSuitableForBSS(const GlobalVariable *GV, bool NoZerosInBSS) {
   const Constant *C = GV->getInitializer();
 
   // Must have zero initializer.
@@ -72,31 +72,27 @@ static bool isSuitableForBSS(const GlobalVariable *GV) {
 
 /// IsNullTerminatedString - Return true if the specified constant (which is
 /// 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.
+/// nul value and contains no other nuls in it.  Note that this is more general
+/// than ConstantDataSequential::isString because we allow 2 & 4 byte strings.
 static bool IsNullTerminatedString(const Constant *C) {
-  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)) {
-    if (ATy->getNumElements() == 0) return false;
-
-    ConstantInt *Null =
-      dyn_cast<ConstantInt>(CVA->getOperand(ATy->getNumElements()-1));
-    if (Null == 0 || !Null->isZero())
+  // First check: is we have constant array terminated with zero
+  if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(C)) {
+    unsigned NumElts = CDS->getNumElements();
+    assert(NumElts != 0 && "Can't have an empty CDS");
+    
+    if (CDS->getElementAsInteger(NumElts-1) != 0)
       return false; // Not null terminated.
-
+    
     // Verify that the null doesn't occur anywhere else in the string.
-    for (unsigned i = 0, e = ATy->getNumElements()-1; i != e; ++i)
-      // Reject constantexpr elements etc.
-      if (!isa<ConstantInt>(CVA->getOperand(i)) ||
-          CVA->getOperand(i) == Null)
+    for (unsigned i = 0; i != NumElts-1; ++i)
+      if (CDS->getElementAsInteger(i) == 0)
         return false;
     return true;
   }
 
   // Another possibility: [1 x i8] zeroinitializer
   if (isa<ConstantAggregateZero>(C))
-    return ATy->getNumElements() == 1;
+    return cast<ArrayType>(C->getType())->getNumElements() == 1;
 
   return false;
 }
@@ -132,7 +128,7 @@ 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();
   }
@@ -142,7 +138,7 @@ 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())
@@ -156,10 +152,9 @@ SectionKind TargetLoweringObjectFile::getKindForGlobal(const GlobalValue *GV,
   // a mergable string section, or general .data if it contains relocations.
   if (GVar->isConstant()) {
     // If the initializer for the global contains something that requires a
-    // relocation, then we may have to drop this into a wriable data section
+    // relocation, then we may have to drop this into a writable data section
     // even though it is marked const.
     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
@@ -233,7 +228,6 @@ SectionKind TargetLoweringObjectFile::getKindForGlobal(const GlobalValue *GV,
     return SectionKind::getDataNoRel();
 
   switch (C->getRelocationInfo()) {
-  default: assert(0 && "unknown relocation info kind");
   case Constant::NoRelocation:
     return SectionKind::getDataNoRel();
   case Constant::LocalRelocation:
@@ -241,6 +235,7 @@ SectionKind TargetLoweringObjectFile::getKindForGlobal(const GlobalValue *GV,
   case Constant::GlobalRelocations:
     return SectionKind::getDataRel();
   }
+  llvm_unreachable("Invalid relocation");
 }
 
 /// SectionForGlobal - This method computes the appropriate section to emit
@@ -322,20 +317,3 @@ getExprForDwarfReference(const MCSymbol *Sym, unsigned Encoding,
   }
   }
 }
-
-unsigned TargetLoweringObjectFile::getPersonalityEncoding() const {
-  return dwarf::DW_EH_PE_absptr;
-}
-
-unsigned TargetLoweringObjectFile::getLSDAEncoding() const {
-  return dwarf::DW_EH_PE_absptr;
-}
-
-unsigned TargetLoweringObjectFile::getFDEEncoding(bool CFI) const {
-  return dwarf::DW_EH_PE_absptr;
-}
-
-unsigned TargetLoweringObjectFile::getTTypeEncoding() const {
-  return dwarf::DW_EH_PE_absptr;
-}
-