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//===- ARMConstantPoolValue.h - ARM constantpool value ----------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the ARM specific constantpool value class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_ARM_ARMCONSTANTPOOLVALUE_H
#define LLVM_LIB_TARGET_ARM_ARMCONSTANTPOOLVALUE_H
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/Support/Casting.h"
#include <string>
#include <vector>
namespace llvm {
class BlockAddress;
class Constant;
class GlobalValue;
class GlobalVariable;
class LLVMContext;
class MachineBasicBlock;
class raw_ostream;
class Type;
namespace ARMCP {
enum ARMCPKind {
CPValue,
CPExtSymbol,
CPBlockAddress,
CPLSDA,
CPMachineBasicBlock,
CPPromotedGlobal
};
enum ARMCPModifier {
no_modifier, /// None
TLSGD, /// Thread Local Storage (General Dynamic Mode)
GOT_PREL, /// Global Offset Table, PC Relative
GOTTPOFF, /// Global Offset Table, Thread Pointer Offset
TPOFF, /// Thread Pointer Offset
SECREL, /// Section Relative (Windows TLS)
SBREL, /// Static Base Relative (RWPI)
};
} // end namespace ARMCP
/// ARMConstantPoolValue - ARM specific constantpool value. This is used to
/// represent PC-relative displacement between the address of the load
/// instruction and the constant being loaded, i.e. (&GV-(LPIC+8)).
class ARMConstantPoolValue : public MachineConstantPoolValue {
unsigned LabelId; // Label id of the load.
ARMCP::ARMCPKind Kind; // Kind of constant.
unsigned char PCAdjust; // Extra adjustment if constantpool is pc-relative.
// 8 for ARM, 4 for Thumb.
ARMCP::ARMCPModifier Modifier; // GV modifier i.e. (&GV(modifier)-(LPIC+8))
bool AddCurrentAddress;
protected:
ARMConstantPoolValue(Type *Ty, unsigned id, ARMCP::ARMCPKind Kind,
unsigned char PCAdj, ARMCP::ARMCPModifier Modifier,
bool AddCurrentAddress);
ARMConstantPoolValue(LLVMContext &C, unsigned id, ARMCP::ARMCPKind Kind,
unsigned char PCAdj, ARMCP::ARMCPModifier Modifier,
bool AddCurrentAddress);
template <typename Derived>
int getExistingMachineCPValueImpl(MachineConstantPool *CP, Align Alignment) {
const std::vector<MachineConstantPoolEntry> &Constants = CP->getConstants();
for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
if (Constants[i].isMachineConstantPoolEntry() &&
Constants[i].getAlign() >= Alignment) {
auto *CPV =
static_cast<ARMConstantPoolValue*>(Constants[i].Val.MachineCPVal);
if (Derived *APC = dyn_cast<Derived>(CPV))
if (cast<Derived>(this)->equals(APC))
return i;
}
}
return -1;
}
public:
~ARMConstantPoolValue() override;
ARMCP::ARMCPModifier getModifier() const { return Modifier; }
StringRef getModifierText() const;
bool hasModifier() const { return Modifier != ARMCP::no_modifier; }
bool mustAddCurrentAddress() const { return AddCurrentAddress; }
unsigned getLabelId() const { return LabelId; }
unsigned char getPCAdjustment() const { return PCAdjust; }
bool isGlobalValue() const { return Kind == ARMCP::CPValue; }
bool isExtSymbol() const { return Kind == ARMCP::CPExtSymbol; }
bool isBlockAddress() const { return Kind == ARMCP::CPBlockAddress; }
bool isLSDA() const { return Kind == ARMCP::CPLSDA; }
bool isMachineBasicBlock() const{ return Kind == ARMCP::CPMachineBasicBlock; }
bool isPromotedGlobal() const{ return Kind == ARMCP::CPPromotedGlobal; }
int getExistingMachineCPValue(MachineConstantPool *CP,
Align Alignment) override;
void addSelectionDAGCSEId(FoldingSetNodeID &ID) override;
/// hasSameValue - Return true if this ARM constpool value can share the same
/// constantpool entry as another ARM constpool value.
virtual bool hasSameValue(ARMConstantPoolValue *ACPV);
bool equals(const ARMConstantPoolValue *A) const {
return this->LabelId == A->LabelId &&
this->PCAdjust == A->PCAdjust &&
this->Modifier == A->Modifier;
}
void print(raw_ostream &O) const override;
void print(raw_ostream *O) const { if (O) print(*O); }
void dump() const;
};
inline raw_ostream &operator<<(raw_ostream &O, const ARMConstantPoolValue &V) {
V.print(O);
return O;
}
/// ARMConstantPoolConstant - ARM-specific constant pool values for Constants,
/// Functions, and BlockAddresses.
class ARMConstantPoolConstant : public ARMConstantPoolValue {
const Constant *CVal; // Constant being loaded.
SmallPtrSet<const GlobalVariable*, 1> GVars;
ARMConstantPoolConstant(const Constant *C,
unsigned ID,
ARMCP::ARMCPKind Kind,
unsigned char PCAdj,
ARMCP::ARMCPModifier Modifier,
bool AddCurrentAddress);
ARMConstantPoolConstant(Type *Ty, const Constant *C,
unsigned ID,
ARMCP::ARMCPKind Kind,
unsigned char PCAdj,
ARMCP::ARMCPModifier Modifier,
bool AddCurrentAddress);
ARMConstantPoolConstant(const GlobalVariable *GV, const Constant *Init);
public:
static ARMConstantPoolConstant *Create(const Constant *C, unsigned ID);
static ARMConstantPoolConstant *Create(const GlobalValue *GV,
ARMCP::ARMCPModifier Modifier);
static ARMConstantPoolConstant *Create(const GlobalVariable *GV,
const Constant *Initializer);
static ARMConstantPoolConstant *Create(const Constant *C, unsigned ID,
ARMCP::ARMCPKind Kind,
unsigned char PCAdj);
static ARMConstantPoolConstant *Create(const Constant *C, unsigned ID,
ARMCP::ARMCPKind Kind,
unsigned char PCAdj,
ARMCP::ARMCPModifier Modifier,
bool AddCurrentAddress);
const GlobalValue *getGV() const;
const BlockAddress *getBlockAddress() const;
using promoted_iterator = SmallPtrSet<const GlobalVariable *, 1>::iterator;
iterator_range<promoted_iterator> promotedGlobals() {
return iterator_range<promoted_iterator>(GVars.begin(), GVars.end());
}
const Constant *getPromotedGlobalInit() const {
return CVal;
}
int getExistingMachineCPValue(MachineConstantPool *CP,
Align Alignment) override;
/// hasSameValue - Return true if this ARM constpool value can share the same
/// constantpool entry as another ARM constpool value.
bool hasSameValue(ARMConstantPoolValue *ACPV) override;
void addSelectionDAGCSEId(FoldingSetNodeID &ID) override;
void print(raw_ostream &O) const override;
static bool classof(const ARMConstantPoolValue *APV) {
return APV->isGlobalValue() || APV->isBlockAddress() || APV->isLSDA() ||
APV->isPromotedGlobal();
}
bool equals(const ARMConstantPoolConstant *A) const {
return CVal == A->CVal && ARMConstantPoolValue::equals(A);
}
};
/// ARMConstantPoolSymbol - ARM-specific constantpool values for external
/// symbols.
class ARMConstantPoolSymbol : public ARMConstantPoolValue {
const std::string S; // ExtSymbol being loaded.
ARMConstantPoolSymbol(LLVMContext &C, StringRef s, unsigned id,
unsigned char PCAdj, ARMCP::ARMCPModifier Modifier,
bool AddCurrentAddress);
public:
static ARMConstantPoolSymbol *Create(LLVMContext &C, StringRef s, unsigned ID,
unsigned char PCAdj);
StringRef getSymbol() const { return S; }
int getExistingMachineCPValue(MachineConstantPool *CP,
Align Alignment) override;
void addSelectionDAGCSEId(FoldingSetNodeID &ID) override;
/// hasSameValue - Return true if this ARM constpool value can share the same
/// constantpool entry as another ARM constpool value.
bool hasSameValue(ARMConstantPoolValue *ACPV) override;
void print(raw_ostream &O) const override;
static bool classof(const ARMConstantPoolValue *ACPV) {
return ACPV->isExtSymbol();
}
bool equals(const ARMConstantPoolSymbol *A) const {
return S == A->S && ARMConstantPoolValue::equals(A);
}
};
/// ARMConstantPoolMBB - ARM-specific constantpool value of a machine basic
/// block.
class ARMConstantPoolMBB : public ARMConstantPoolValue {
const MachineBasicBlock *MBB; // Machine basic block.
ARMConstantPoolMBB(LLVMContext &C, const MachineBasicBlock *mbb, unsigned id,
unsigned char PCAdj, ARMCP::ARMCPModifier Modifier,
bool AddCurrentAddress);
public:
static ARMConstantPoolMBB *Create(LLVMContext &C,
const MachineBasicBlock *mbb,
unsigned ID, unsigned char PCAdj);
const MachineBasicBlock *getMBB() const { return MBB; }
int getExistingMachineCPValue(MachineConstantPool *CP,
Align Alignment) override;
void addSelectionDAGCSEId(FoldingSetNodeID &ID) override;
/// hasSameValue - Return true if this ARM constpool value can share the same
/// constantpool entry as another ARM constpool value.
bool hasSameValue(ARMConstantPoolValue *ACPV) override;
void print(raw_ostream &O) const override;
static bool classof(const ARMConstantPoolValue *ACPV) {
return ACPV->isMachineBasicBlock();
}
bool equals(const ARMConstantPoolMBB *A) const {
return MBB == A->MBB && ARMConstantPoolValue::equals(A);
}
};
} // end namespace llvm
#endif // LLVM_LIB_TARGET_ARM_ARMCONSTANTPOOLVALUE_H
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