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add an API so target-independent codegen can determine if a constant

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pool entry will require relocations against it.  I implemented this
conservatively for ARM, someone who is knowledgable about it should
see if this can be improved.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76678 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-07-21 23:34:23 +00:00
parent ce9fe9fae5
commit cb45963643
3 changed files with 55 additions and 2 deletions
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29
include/llvm/CodeGen/MachineConstantPool.h
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@@ -41,8 +41,22 @@ public:
/// getType - get type of this MachineConstantPoolValue.
///
inline const Type *getType() const { return Ty; }
const Type *getType() const { return Ty; }
/// getRelocatationInfo - 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.
virtual unsigned getRelocatationInfo() const = 0;
virtual int getExistingMachineCPValue(MachineConstantPool *CP,
unsigned Alignment) = 0;
@@ -94,6 +108,19 @@ public:
}
const Type *getType() const;
/// getRelocatationInfo - 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.
unsigned getRelocatationInfo() const;
};
/// The MachineConstantPool class keeps track of constants referenced by a