+
+ // If the user requested use of 64-bit regs, but the cpu selected doesn't
+ // support it, ignore.
+ if (use64BitRegs() && !has64BitSupport())
+ Use64BitRegs = false;
+
+ // Set the boolean corresponding to the current target triple, or the default
+ // if one cannot be determined, to true.
+ if (TT.length() > 7) {
+ // Determine which version of darwin this is.
+ size_t DarwinPos = TT.find("-darwin");
+ if (DarwinPos != std::string::npos) {
+ if (isdigit(TT[DarwinPos+7]))
+ DarwinVers = atoi(&TT[DarwinPos+7]);
+ else
+ DarwinVers = 8; // Minimum supported darwin is Tiger.
+ }
+ }
+
+ // Set up darwin-specific properties.
+ if (isDarwin())
+ HasLazyResolverStubs = true;
+}
+
+/// SetJITMode - This is called to inform the subtarget info that we are
+/// producing code for the JIT.
+void PPCSubtarget::SetJITMode() {
+ // JIT mode doesn't want lazy resolver stubs, it knows exactly where
+ // everything is. This matters for PPC64, which codegens in PIC mode without
+ // stubs.
+ HasLazyResolverStubs = false;
+}
+
+
+/// hasLazyResolverStub - Return true if accesses to the specified global have
+/// to go through a dyld lazy resolution stub. This means that an extra load
+/// is required to get the address of the global.
+bool PPCSubtarget::hasLazyResolverStub(const GlobalValue *GV,
+ const TargetMachine &TM) const {
+ // We never hae stubs if HasLazyResolverStubs=false or if in static mode.
+ if (!HasLazyResolverStubs || TM.getRelocationModel() == Reloc::Static)
+ return false;
+ // If symbol visibility is hidden, the extra load is not needed if
+ // the symbol is definitely defined in the current translation unit.
+ bool isDecl = GV->isDeclaration() && !GV->isMaterializable();
+ if (GV->hasHiddenVisibility() && !isDecl && !GV->hasCommonLinkage())
+ return false;
+ return GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
+ GV->hasCommonLinkage() || isDecl;