//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
enum AddressType {
isResult, // Relocation has be transformed into its result pointer.
isGV, // The Target.GV field is valid.
+ isGVLazyPtr, // Relocation of a lazily resolved GV address.
isBB, // Relocation of BB address.
isExtSym, // The Target.ExtSym field is valid.
isConstPool, // Relocation of constant pool address.
union {
void *Result; // If this has been resolved to a resolved pointer
- GlobalValue *GV; // If this is a pointer to an LLVM global
+ GlobalValue *GV; // If this is a pointer to a GV or a GV lazy ptr
MachineBasicBlock *MBB; // If this is a pointer to a LLVM BB
const char *ExtSym; // If this is a pointer to a named symbol
unsigned Index; // Constant pool / jump table index
} Target;
unsigned TargetReloType : 6; // The target relocation ID.
- AddressType AddrType : 3; // The field of Target to use.
- bool DoesntNeedFnStub : 1; // True if we don't need a fn stub.
+ AddressType AddrType : 4; // The field of Target to use.
+ bool NeedStub : 1; // True if this relocation requires a stub.
bool GOTRelative : 1; // Should this relocation be relative to the GOT?
public:
+ // Relocation types used in a generic implementation. Currently, relocation
+ // entries for all things use the generic VANILLA type until they are refined
+ // into target relocation types.
+ enum RelocationType {
+ VANILLA
+ };
+
/// MachineRelocation::getGV - Return a relocation entry for a GlobalValue.
///
static MachineRelocation getGV(intptr_t offset, unsigned RelocationType,
GlobalValue *GV, intptr_t cst = 0,
- bool DoesntNeedFunctionStub = 0,
+ bool NeedStub = 0,
bool GOTrelative = 0) {
assert((RelocationType & ~63) == 0 && "Relocation type too large!");
MachineRelocation Result;
Result.ConstantVal = cst;
Result.TargetReloType = RelocationType;
Result.AddrType = isGV;
- Result.DoesntNeedFnStub = DoesntNeedFunctionStub;
+ Result.NeedStub = NeedStub;
+ Result.GOTRelative = GOTrelative;
+ Result.Target.GV = GV;
+ return Result;
+ }
+
+ /// MachineRelocation::getGVLazyPtr - Return a relocation entry for a
+ /// lazily resolved GlobalValue address.
+ static MachineRelocation getGVLazyPtr(intptr_t offset,
+ unsigned RelocationType,
+ GlobalValue *GV, intptr_t cst = 0,
+ bool NeedStub = 0,
+ bool GOTrelative = 0) {
+ assert((RelocationType & ~63) == 0 && "Relocation type too large!");
+ MachineRelocation Result;
+ Result.Offset = offset;
+ Result.ConstantVal = cst;
+ Result.TargetReloType = RelocationType;
+ Result.AddrType = isGVLazyPtr;
+ Result.NeedStub = NeedStub;
Result.GOTRelative = GOTrelative;
Result.Target.GV = GV;
return Result;
Result.ConstantVal = cst;
Result.TargetReloType = RelocationType;
Result.AddrType = isBB;
- Result.DoesntNeedFnStub = false;
+ Result.NeedStub = false;
Result.GOTRelative = false;
Result.Target.MBB = MBB;
return Result;
Result.ConstantVal = cst;
Result.TargetReloType = RelocationType;
Result.AddrType = isExtSym;
- Result.DoesntNeedFnStub = false;
+ Result.NeedStub = true;
Result.GOTRelative = GOTrelative;
Result.Target.ExtSym = ES;
return Result;
Result.ConstantVal = cst;
Result.TargetReloType = RelocationType;
Result.AddrType = isConstPool;
- Result.DoesntNeedFnStub = false;
+ Result.NeedStub = false;
Result.GOTRelative = false;
Result.Target.Index = CPI;
return Result;
Result.ConstantVal = cst;
Result.TargetReloType = RelocationType;
Result.AddrType = isJumpTable;
- Result.DoesntNeedFnStub = false;
+ Result.NeedStub = false;
Result.GOTRelative = false;
Result.Target.Index = JTI;
return Result;
return ConstantVal;
}
+ /// setConstantVal - Set the constant value associated with this relocation.
+ /// This is often an offset from the symbol.
+ ///
+ void setConstantVal(intptr_t val) {
+ ConstantVal = val;
+ }
+
/// isGlobalValue - Return true if this relocation is a GlobalValue, as
/// opposed to a constant string.
bool isGlobalValue() const {
return AddrType == isGV;
}
+ /// isGlobalValueVLazyPtr - Return true if this relocation is the address
+ /// of a lazily resolved GlobalValue.
+ bool isGlobalValueLazyPtr() const {
+ return AddrType == isGVLazyPtr;
+ }
+
/// isBasicBlock - Return true if this relocation is a basic block reference.
///
bool isBasicBlock() const {
return GOTRelative;
}
- /// doesntNeedFunctionStub - This function returns true if the JIT for this
- /// target is capable of directly handling the relocated instruction without
- /// using a stub function. It is always conservatively correct for this flag
- /// to be false, but targets can improve their compilation callback functions
- /// to handle more general cases if they want improved performance.
- bool doesntNeedFunctionStub() const {
- return DoesntNeedFnStub;
+ /// doesntNeedStub - This function returns true if the JIT for this target
+ /// target is capable of directly handling the relocated GlobalValue reference
+ /// without using either a stub function or issuing an extra load to get the
+ /// GV address.
+ bool doesntNeedStub() const {
+ return !NeedStub;
}
/// getGlobalValue - If this is a global value reference, return the
/// referenced global.
GlobalValue *getGlobalValue() const {
- assert(isGlobalValue() && "This is not a global value reference!");
+ assert((isGlobalValue() || isGlobalValueLazyPtr()) &&
+ "This is not a global value reference!");
return Target.GV;
}
projects / oota-llvm.git / blobdiff