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Diffstat (limited to 'include/llvm/CodeGen/MachineRelocation.h')
| -rw-r--r-- | include/llvm/CodeGen/MachineRelocation.h | 342 |
1 files changed, 0 insertions, 342 deletions
diff --git a/include/llvm/CodeGen/MachineRelocation.h b/include/llvm/CodeGen/MachineRelocation.h deleted file mode 100644 index e778457..0000000 --- a/include/llvm/CodeGen/MachineRelocation.h +++ /dev/null @@ -1,342 +0,0 @@ -//===-- llvm/CodeGen/MachineRelocation.h - Target Relocation ----*- C++ -*-===// -// -// The LLVM Compiler Infrastructure -// -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. -// -//===----------------------------------------------------------------------===// -// -// This file defines the MachineRelocation class. -// -//===----------------------------------------------------------------------===// - -#ifndef LLVM_CODEGEN_MACHINERELOCATION_H -#define LLVM_CODEGEN_MACHINERELOCATION_H - -#include "llvm/Support/DataTypes.h" -#include <cassert> - -namespace llvm { -class GlobalValue; -class MachineBasicBlock; - -/// MachineRelocation - This represents a target-specific relocation value, -/// produced by the code emitter. This relocation is resolved after the has -/// been emitted, either to an object file or to memory, when the target of the -/// relocation can be resolved. -/// -/// A relocation is made up of the following logical portions: -/// 1. An offset in the machine code buffer, the location to modify. -/// 2. A target specific relocation type (a number from 0 to 63). -/// 3. A symbol being referenced, either as a GlobalValue* or as a string. -/// 4. An optional constant value to be added to the reference. -/// 5. A bit, CanRewrite, which indicates to the JIT that a function stub is -/// not needed for the relocation. -/// 6. An index into the GOT, if the target uses a GOT -/// -class MachineRelocation { - enum AddressType { - isResult, // Relocation has be transformed into its result pointer. - isGV, // The Target.GV field is valid. - isIndirectSym, // Relocation of an indirect symbol. - isBB, // Relocation of BB address. - isExtSym, // The Target.ExtSym field is valid. - isConstPool, // Relocation of constant pool address. - isJumpTable, // Relocation of jump table address. - isGOTIndex // The Target.GOTIndex field is valid. - }; - - /// Offset - This is the offset from the start of the code buffer of the - /// relocation to perform. - uintptr_t Offset; - - /// ConstantVal - A field that may be used by the target relocation type. - intptr_t ConstantVal; - - union { - void *Result; // If this has been resolved to a resolved pointer - GlobalValue *GV; // If this is a pointer to a GV or an indirect ref. - MachineBasicBlock *MBB; // If this is a pointer to an LLVM BB - const char *ExtSym; // If this is a pointer to a named symbol - unsigned Index; // Constant pool / jump table index - unsigned GOTIndex; // Index in the GOT of this symbol/global - } Target; - - unsigned TargetReloType : 6; // The target relocation ID - AddressType AddrType : 4; // The field of Target to use - bool MayNeedFarStub : 1; // True if this relocation may require a far-stub - bool GOTRelative : 1; // Should this relocation be relative to the GOT? - bool TargetResolve : 1; // True if target should resolve the address - -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(uintptr_t offset, unsigned RelocationType, - GlobalValue *GV, intptr_t cst = 0, - bool MayNeedFarStub = 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 = isGV; - Result.MayNeedFarStub = MayNeedFarStub; - Result.GOTRelative = GOTrelative; - Result.TargetResolve = false; - Result.Target.GV = GV; - return Result; - } - - /// MachineRelocation::getIndirectSymbol - Return a relocation entry for an - /// indirect symbol. - static MachineRelocation getIndirectSymbol(uintptr_t offset, - unsigned RelocationType, - GlobalValue *GV, intptr_t cst = 0, - bool MayNeedFarStub = 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 = isIndirectSym; - Result.MayNeedFarStub = MayNeedFarStub; - Result.GOTRelative = GOTrelative; - Result.TargetResolve = false; - Result.Target.GV = GV; - return Result; - } - - /// MachineRelocation::getBB - Return a relocation entry for a BB. - /// - static MachineRelocation getBB(uintptr_t offset,unsigned RelocationType, - MachineBasicBlock *MBB, intptr_t cst = 0) { - assert((RelocationType & ~63) == 0 && "Relocation type too large!"); - MachineRelocation Result; - Result.Offset = offset; - Result.ConstantVal = cst; - Result.TargetReloType = RelocationType; - Result.AddrType = isBB; - Result.MayNeedFarStub = false; - Result.GOTRelative = false; - Result.TargetResolve = false; - Result.Target.MBB = MBB; - return Result; - } - - /// MachineRelocation::getExtSym - Return a relocation entry for an external - /// symbol, like "free". - /// - static MachineRelocation getExtSym(uintptr_t offset, unsigned RelocationType, - const char *ES, intptr_t cst = 0, - bool GOTrelative = 0, - bool NeedStub = true) { - assert((RelocationType & ~63) == 0 && "Relocation type too large!"); - MachineRelocation Result; - Result.Offset = offset; - Result.ConstantVal = cst; - Result.TargetReloType = RelocationType; - Result.AddrType = isExtSym; - Result.MayNeedFarStub = NeedStub; - Result.GOTRelative = GOTrelative; - Result.TargetResolve = false; - Result.Target.ExtSym = ES; - return Result; - } - - /// MachineRelocation::getConstPool - Return a relocation entry for a constant - /// pool entry. - /// - static MachineRelocation getConstPool(uintptr_t offset,unsigned RelocationType, - unsigned CPI, intptr_t cst = 0, - bool letTargetResolve = false) { - assert((RelocationType & ~63) == 0 && "Relocation type too large!"); - MachineRelocation Result; - Result.Offset = offset; - Result.ConstantVal = cst; - Result.TargetReloType = RelocationType; - Result.AddrType = isConstPool; - Result.MayNeedFarStub = false; - Result.GOTRelative = false; - Result.TargetResolve = letTargetResolve; - Result.Target.Index = CPI; - return Result; - } - - /// MachineRelocation::getJumpTable - Return a relocation entry for a jump - /// table entry. - /// - static MachineRelocation getJumpTable(uintptr_t offset,unsigned RelocationType, - unsigned JTI, intptr_t cst = 0, - bool letTargetResolve = false) { - assert((RelocationType & ~63) == 0 && "Relocation type too large!"); - MachineRelocation Result; - Result.Offset = offset; - Result.ConstantVal = cst; - Result.TargetReloType = RelocationType; - Result.AddrType = isJumpTable; - Result.MayNeedFarStub = false; - Result.GOTRelative = false; - Result.TargetResolve = letTargetResolve; - Result.Target.Index = JTI; - return Result; - } - - /// getMachineCodeOffset - Return the offset into the code buffer that the - /// relocation should be performed. - intptr_t getMachineCodeOffset() const { - return Offset; - } - - /// getRelocationType - Return the target-specific relocation ID for this - /// relocation. - unsigned getRelocationType() const { - return TargetReloType; - } - - /// getConstantVal - Get the constant value associated with this relocation. - /// This is often an offset from the symbol. - /// - intptr_t getConstantVal() const { - 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; - } - - /// isIndirectSymbol - Return true if this relocation is the address an - /// indirect symbol - bool isIndirectSymbol() const { - return AddrType == isIndirectSym; - } - - /// isBasicBlock - Return true if this relocation is a basic block reference. - /// - bool isBasicBlock() const { - return AddrType == isBB; - } - - /// isExternalSymbol - Return true if this is a constant string. - /// - bool isExternalSymbol() const { - return AddrType == isExtSym; - } - - /// isConstantPoolIndex - Return true if this is a constant pool reference. - /// - bool isConstantPoolIndex() const { - return AddrType == isConstPool; - } - - /// isJumpTableIndex - Return true if this is a jump table reference. - /// - bool isJumpTableIndex() const { - return AddrType == isJumpTable; - } - - /// isGOTRelative - Return true the target wants the index into the GOT of - /// the symbol rather than the address of the symbol. - bool isGOTRelative() const { - return GOTRelative; - } - - /// mayNeedFarStub - This function returns true if the JIT for this target may - /// need either a stub function or an indirect global-variable load to handle - /// the relocated GlobalValue reference. For example, the x86-64 call - /// instruction can only call functions within +/-2GB of the call site. - /// Anything farther away needs a longer mov+call sequence, which can't just - /// be written on top of the existing call. - bool mayNeedFarStub() const { - return MayNeedFarStub; - } - - /// letTargetResolve - Return true if the target JITInfo is usually - /// responsible for resolving the address of this relocation. - bool letTargetResolve() const { - return TargetResolve; - } - - /// getGlobalValue - If this is a global value reference, return the - /// referenced global. - GlobalValue *getGlobalValue() const { - assert((isGlobalValue() || isIndirectSymbol()) && - "This is not a global value reference!"); - return Target.GV; - } - - MachineBasicBlock *getBasicBlock() const { - assert(isBasicBlock() && "This is not a basic block reference!"); - return Target.MBB; - } - - /// getString - If this is a string value, return the string reference. - /// - const char *getExternalSymbol() const { - assert(isExternalSymbol() && "This is not an external symbol reference!"); - return Target.ExtSym; - } - - /// getConstantPoolIndex - If this is a const pool reference, return - /// the index into the constant pool. - unsigned getConstantPoolIndex() const { - assert(isConstantPoolIndex() && "This is not a constant pool reference!"); - return Target.Index; - } - - /// getJumpTableIndex - If this is a jump table reference, return - /// the index into the jump table. - unsigned getJumpTableIndex() const { - assert(isJumpTableIndex() && "This is not a jump table reference!"); - return Target.Index; - } - - /// getResultPointer - Once this has been resolved to point to an actual - /// address, this returns the pointer. - void *getResultPointer() const { - assert(AddrType == isResult && "Result pointer isn't set yet!"); - return Target.Result; - } - - /// setResultPointer - Set the result to the specified pointer value. - /// - void setResultPointer(void *Ptr) { - Target.Result = Ptr; - AddrType = isResult; - } - - /// setGOTIndex - Set the GOT index to a specific value. - void setGOTIndex(unsigned idx) { - AddrType = isGOTIndex; - Target.GOTIndex = idx; - } - - /// getGOTIndex - Once this has been resolved to an entry in the GOT, - /// this returns that index. The index is from the lowest address entry - /// in the GOT. - unsigned getGOTIndex() const { - assert(AddrType == isGOTIndex); - return Target.GOTIndex; - } -}; -} - -#endif |