9abb2fa5bb
If a constant is unamed_addr and is only used within one function, we can save
on the code size and runtime cost of an indirection by changing the global's storage
to inside the constant pool. For example, instead of:
ldr r0, .CPI0
bl printf
bx lr
.CPI0: &format_string
format_string: .asciz "hello, world!\n"
We can emit:
adr r0, .CPI0
bl printf
bx lr
.CPI0: .asciz "hello, world!\n"
This can cause significant code size savings when many small strings are used in one
function (4 bytes per string).
This recommit contains fixes for a nasty bug related to fast-isel fallback - because
fast-isel doesn't know about this optimization, if it runs and emits references to
a string that we inline (because fast-isel fell back to SDAG) we will end up
with an inlined string and also an out-of-line string, and we won't emit the
out-of-line string, causing backend failures.
It also contains fixes for emitting .text relocations which made the sanitizer
bots unhappy.
llvm-svn: 282387
273 lines
9.9 KiB
C++
273 lines
9.9 KiB
C++
//===-- ARMConstantPoolValue.h - ARM constantpool value ---------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the ARM specific constantpool value class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_ARM_ARMCONSTANTPOOLVALUE_H
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#define LLVM_LIB_TARGET_ARM_ARMCONSTANTPOOLVALUE_H
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/ErrorHandling.h"
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#include <cstddef>
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namespace llvm {
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class BlockAddress;
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class Constant;
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class GlobalValue;
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class GlobalVariable;
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class LLVMContext;
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class MachineBasicBlock;
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namespace ARMCP {
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enum ARMCPKind {
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CPValue,
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CPExtSymbol,
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CPBlockAddress,
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CPLSDA,
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CPMachineBasicBlock,
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CPPromotedGlobal
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};
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enum ARMCPModifier {
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no_modifier, /// None
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TLSGD, /// Thread Local Storage (General Dynamic Mode)
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GOT_PREL, /// Global Offset Table, PC Relative
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GOTTPOFF, /// Global Offset Table, Thread Pointer Offset
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TPOFF, /// Thread Pointer Offset
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SECREL, /// Section Relative (Windows TLS)
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SBREL, /// Static Base Relative (RWPI)
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};
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}
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/// ARMConstantPoolValue - ARM specific constantpool value. This is used to
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/// represent PC-relative displacement between the address of the load
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/// instruction and the constant being loaded, i.e. (&GV-(LPIC+8)).
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class ARMConstantPoolValue : public MachineConstantPoolValue {
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unsigned LabelId; // Label id of the load.
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ARMCP::ARMCPKind Kind; // Kind of constant.
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unsigned char PCAdjust; // Extra adjustment if constantpool is pc-relative.
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// 8 for ARM, 4 for Thumb.
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ARMCP::ARMCPModifier Modifier; // GV modifier i.e. (&GV(modifier)-(LPIC+8))
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bool AddCurrentAddress;
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protected:
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ARMConstantPoolValue(Type *Ty, unsigned id, ARMCP::ARMCPKind Kind,
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unsigned char PCAdj, ARMCP::ARMCPModifier Modifier,
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bool AddCurrentAddress);
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ARMConstantPoolValue(LLVMContext &C, unsigned id, ARMCP::ARMCPKind Kind,
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unsigned char PCAdj, ARMCP::ARMCPModifier Modifier,
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bool AddCurrentAddress);
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template <typename Derived>
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int getExistingMachineCPValueImpl(MachineConstantPool *CP,
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unsigned Alignment) {
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unsigned AlignMask = Alignment - 1;
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const std::vector<MachineConstantPoolEntry> &Constants = CP->getConstants();
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for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
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if (Constants[i].isMachineConstantPoolEntry() &&
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(Constants[i].getAlignment() & AlignMask) == 0) {
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ARMConstantPoolValue *CPV =
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(ARMConstantPoolValue *)Constants[i].Val.MachineCPVal;
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if (Derived *APC = dyn_cast<Derived>(CPV))
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if (cast<Derived>(this)->equals(APC))
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return i;
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}
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}
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return -1;
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}
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public:
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~ARMConstantPoolValue() override;
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ARMCP::ARMCPModifier getModifier() const { return Modifier; }
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const char *getModifierText() const;
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bool hasModifier() const { return Modifier != ARMCP::no_modifier; }
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bool mustAddCurrentAddress() const { return AddCurrentAddress; }
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unsigned getLabelId() const { return LabelId; }
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unsigned char getPCAdjustment() const { return PCAdjust; }
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bool isGlobalValue() const { return Kind == ARMCP::CPValue; }
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bool isExtSymbol() const { return Kind == ARMCP::CPExtSymbol; }
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bool isBlockAddress() const { return Kind == ARMCP::CPBlockAddress; }
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bool isLSDA() const { return Kind == ARMCP::CPLSDA; }
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bool isMachineBasicBlock() const{ return Kind == ARMCP::CPMachineBasicBlock; }
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bool isPromotedGlobal() const{ return Kind == ARMCP::CPPromotedGlobal; }
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int getExistingMachineCPValue(MachineConstantPool *CP,
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unsigned Alignment) override;
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void addSelectionDAGCSEId(FoldingSetNodeID &ID) override;
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/// hasSameValue - Return true if this ARM constpool value can share the same
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/// constantpool entry as another ARM constpool value.
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virtual bool hasSameValue(ARMConstantPoolValue *ACPV);
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bool equals(const ARMConstantPoolValue *A) const {
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return this->LabelId == A->LabelId &&
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this->PCAdjust == A->PCAdjust &&
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this->Modifier == A->Modifier;
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}
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void print(raw_ostream &O) const override;
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void print(raw_ostream *O) const { if (O) print(*O); }
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void dump() const;
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};
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inline raw_ostream &operator<<(raw_ostream &O, const ARMConstantPoolValue &V) {
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V.print(O);
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return O;
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}
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/// ARMConstantPoolConstant - ARM-specific constant pool values for Constants,
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/// Functions, and BlockAddresses.
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class ARMConstantPoolConstant : public ARMConstantPoolValue {
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const Constant *CVal; // Constant being loaded.
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const GlobalVariable *GVar = nullptr;
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ARMConstantPoolConstant(const Constant *C,
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unsigned ID,
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ARMCP::ARMCPKind Kind,
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unsigned char PCAdj,
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ARMCP::ARMCPModifier Modifier,
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bool AddCurrentAddress);
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ARMConstantPoolConstant(Type *Ty, const Constant *C,
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unsigned ID,
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ARMCP::ARMCPKind Kind,
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unsigned char PCAdj,
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ARMCP::ARMCPModifier Modifier,
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bool AddCurrentAddress);
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ARMConstantPoolConstant(const GlobalVariable *GV, const Constant *Init);
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public:
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static ARMConstantPoolConstant *Create(const Constant *C, unsigned ID);
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static ARMConstantPoolConstant *Create(const GlobalValue *GV,
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ARMCP::ARMCPModifier Modifier);
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static ARMConstantPoolConstant *Create(const GlobalVariable *GV,
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const Constant *Initializer);
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static ARMConstantPoolConstant *Create(const Constant *C, unsigned ID,
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ARMCP::ARMCPKind Kind,
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unsigned char PCAdj);
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static ARMConstantPoolConstant *Create(const Constant *C, unsigned ID,
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ARMCP::ARMCPKind Kind,
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unsigned char PCAdj,
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ARMCP::ARMCPModifier Modifier,
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bool AddCurrentAddress);
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const GlobalValue *getGV() const;
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const BlockAddress *getBlockAddress() const;
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const GlobalVariable *getPromotedGlobal() const {
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return dyn_cast_or_null<GlobalVariable>(GVar);
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}
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const Constant *getPromotedGlobalInit() const {
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return CVal;
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}
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int getExistingMachineCPValue(MachineConstantPool *CP,
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unsigned Alignment) override;
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/// hasSameValue - Return true if this ARM constpool value can share the same
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/// constantpool entry as another ARM constpool value.
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bool hasSameValue(ARMConstantPoolValue *ACPV) override;
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void addSelectionDAGCSEId(FoldingSetNodeID &ID) override;
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void print(raw_ostream &O) const override;
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static bool classof(const ARMConstantPoolValue *APV) {
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return APV->isGlobalValue() || APV->isBlockAddress() || APV->isLSDA() ||
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APV->isPromotedGlobal();
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}
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bool equals(const ARMConstantPoolConstant *A) const {
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return CVal == A->CVal && ARMConstantPoolValue::equals(A);
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}
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};
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/// ARMConstantPoolSymbol - ARM-specific constantpool values for external
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/// symbols.
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class ARMConstantPoolSymbol : public ARMConstantPoolValue {
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const std::string S; // ExtSymbol being loaded.
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ARMConstantPoolSymbol(LLVMContext &C, const char *s, unsigned id,
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unsigned char PCAdj, ARMCP::ARMCPModifier Modifier,
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bool AddCurrentAddress);
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public:
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static ARMConstantPoolSymbol *Create(LLVMContext &C, const char *s,
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unsigned ID, unsigned char PCAdj);
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const char *getSymbol() const { return S.c_str(); }
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int getExistingMachineCPValue(MachineConstantPool *CP,
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unsigned Alignment) override;
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void addSelectionDAGCSEId(FoldingSetNodeID &ID) override;
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/// hasSameValue - Return true if this ARM constpool value can share the same
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/// constantpool entry as another ARM constpool value.
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bool hasSameValue(ARMConstantPoolValue *ACPV) override;
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void print(raw_ostream &O) const override;
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static bool classof(const ARMConstantPoolValue *ACPV) {
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return ACPV->isExtSymbol();
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}
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bool equals(const ARMConstantPoolSymbol *A) const {
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return S == A->S && ARMConstantPoolValue::equals(A);
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}
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};
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/// ARMConstantPoolMBB - ARM-specific constantpool value of a machine basic
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/// block.
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class ARMConstantPoolMBB : public ARMConstantPoolValue {
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const MachineBasicBlock *MBB; // Machine basic block.
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ARMConstantPoolMBB(LLVMContext &C, const MachineBasicBlock *mbb, unsigned id,
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unsigned char PCAdj, ARMCP::ARMCPModifier Modifier,
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bool AddCurrentAddress);
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public:
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static ARMConstantPoolMBB *Create(LLVMContext &C,
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const MachineBasicBlock *mbb,
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unsigned ID, unsigned char PCAdj);
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const MachineBasicBlock *getMBB() const { return MBB; }
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int getExistingMachineCPValue(MachineConstantPool *CP,
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unsigned Alignment) override;
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void addSelectionDAGCSEId(FoldingSetNodeID &ID) override;
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/// hasSameValue - Return true if this ARM constpool value can share the same
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/// constantpool entry as another ARM constpool value.
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bool hasSameValue(ARMConstantPoolValue *ACPV) override;
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void print(raw_ostream &O) const override;
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static bool classof(const ARMConstantPoolValue *ACPV) {
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return ACPV->isMachineBasicBlock();
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}
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bool equals(const ARMConstantPoolMBB *A) const {
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return MBB == A->MBB && ARMConstantPoolValue::equals(A);
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}
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};
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} // End llvm namespace
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#endif
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