Remove the uses of getSubtargetImpl from InstrEmitter and remove

[oota-llvm.git] / lib / CodeGen / Analysis.cpp

diff --git a/lib/CodeGen/Analysis.cpp b/lib/CodeGen/Analysis.cpp
index 1bdf312e46c25500f839aaecb1e4c8d2d96a04bc..020363524336c4739a063938a50097b3ca8652a2 100644 (file)
--- a/lib/CodeGen/Analysis.cpp
+++ b/lib/CodeGen/Analysis.cpp
@@ -25,6 +25,9 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/MathExtras.h"
 #include "llvm/Target/TargetLowering.h"
+#include "llvm/Target/TargetSubtargetInfo.h"
+#include "llvm/Transforms/Utils/GlobalStatus.h"
+
 using namespace llvm;
 
 /// ComputeLinearIndex - Given an LLVM IR aggregate type and a sequence
@@ -475,7 +478,7 @@ static bool nextRealType(SmallVectorImpl<CompositeType *> &SubTypes,
 /// between it and the return.
 ///
 /// This function only tests target-independent requirements.
-bool llvm::isInTailCallPosition(ImmutableCallSite CS, const SelectionDAG &DAG) {
+bool llvm::isInTailCallPosition(ImmutableCallSite CS, const TargetMachine &TM) {
   const Instruction *I = CS.getInstruction();
   const BasicBlock *ExitBB = I->getParent();
   const TerminatorInst *Term = ExitBB->getTerminator();
@@ -490,8 +493,7 @@ bool llvm::isInTailCallPosition(ImmutableCallSite CS, const SelectionDAG &DAG) {
   // longjmp on x86), it can end up causing miscompilation that has not
   // been fully understood.
   if (!Ret &&
-      (!DAG.getTarget().Options.GuaranteedTailCallOpt ||
-       !isa<UnreachableInst>(Term)))
+      (!TM.Options.GuaranteedTailCallOpt || !isa<UnreachableInst>(Term)))
     return false;
 
   // If I will have a chain, make sure no other instruction that will have a
@@ -509,8 +511,8 @@ bool llvm::isInTailCallPosition(ImmutableCallSite CS, const SelectionDAG &DAG) {
         return false;
     }
 
-  return returnTypeIsEligibleForTailCall(ExitBB->getParent(), I, Ret,
-                                         *DAG.getTarget().getTargetLowering());
+  return returnTypeIsEligibleForTailCall(
+      ExitBB->getParent(), I, Ret, *TM.getSubtargetImpl()->getTargetLowering());
 }
 
 bool llvm::returnTypeIsEligibleForTailCall(const Function *F,
@@ -607,3 +609,29 @@ bool llvm::returnTypeIsEligibleForTailCall(const Function *F,
 
   return true;
 }
+
+bool llvm::canBeOmittedFromSymbolTable(const GlobalValue *GV) {
+  if (!GV->hasLinkOnceODRLinkage())
+    return false;
+
+  if (GV->hasUnnamedAddr())
+    return true;
+
+  // If it is a non constant variable, it needs to be uniqued across shared
+  // objects.
+  if (const GlobalVariable *Var = dyn_cast<GlobalVariable>(GV)) {
+    if (!Var->isConstant())
+      return false;
+  }
+
+  // An alias can point to a variable. We could try to resolve the alias to
+  // decide, but for now just don't hide them.
+  if (isa<GlobalAlias>(GV))
+    return false;
+
+  GlobalStatus GS;
+  if (GlobalStatus::analyzeGlobal(GV, GS))
+    return false;
+
+  return !GS.IsCompared;
+}