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reimplement Constant::ContainsRelocations as

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Constant::getRelocationInfo(), which has a much simpler
to use API.  It still should not be part of libvmcore, but
is better than it was.  Also teach it to be smart about 
hidden visibility.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76700 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-07-22 00:05:44 +00:00
parent 9c5beed5f5
commit 7cf12c7efd
5 changed files with 51 additions and 67 deletions
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47
lib/VMCore/Constants.cpp
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@@ -101,34 +101,35 @@ bool Constant::canTrap() const {
}
}
/// ContainsRelocations - Return true if the constant value contains relocations
/// which cannot be resolved at compile time. Kind argument is used to filter
/// only 'interesting' sorts of relocations.
bool Constant::ContainsRelocations(unsigned Kind) const {
/// getRelocationInfo - This method classifies the entry according to
/// whether or not it may generate a relocation entry. This must be
/// conservative, so if it might codegen to a relocatable entry, it should say
/// so. The return values are:
///
/// 0: This constant pool entry is guaranteed to never have a relocation
/// applied to it (because it holds a simple constant like '4').
/// 1: This entry has relocations, but the entries are guaranteed to be
/// resolvable by the static linker, so the dynamic linker will never see
/// them.
/// 2: This entry may have arbitrary relocations.
///
/// FIXME: This really should not be in VMCore.
unsigned Constant::getRelocationInfo() const {
if (const GlobalValue* GV = dyn_cast<GlobalValue>(this)) {
bool isLocal = GV->hasLocalLinkage();
if ((Kind & Reloc::Local) && isLocal) {
// Global has local linkage and 'local' kind of relocations are
// requested
return true;
}
if ((Kind & Reloc::Global) && !isLocal) {
// Global has non-local linkage and 'global' kind of relocations are
// requested
return true;
}
return false;
if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
return 1; // Local to this file/library.
return 2; // Global reference.
}
unsigned Result = 0;
for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
if (getOperand(i)->ContainsRelocations(Kind))
return true;
return false;
Result = std::max(Result, getOperand(i)->getRelocationInfo());
return Result;
}
/// getVectorElements - This method, which is only valid on constant of vector
/// type, returns the elements of the vector in the specified smallvector.
/// This handles breaking down a vector undef into undef elements, etc. For