1
0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2024-11-24 03:33:20 +01:00
llvm-mirror/lib/IR/IRBuilder.cpp
Peter Collingbourne 5dcb77e9fb IR: Introduce local_unnamed_addr attribute.
If a local_unnamed_addr attribute is attached to a global, the address
is known to be insignificant within the module. It is distinct from the
existing unnamed_addr attribute in that it only describes a local property
of the module rather than a global property of the symbol.

This attribute is intended to be used by the code generator and LTO to allow
the linker to decide whether the global needs to be in the symbol table. It is
possible to exclude a global from the symbol table if three things are true:
- This attribute is present on every instance of the global (which means that
  the normal rule that the global must have a unique address can be broken without
  being observable by the program by performing comparisons against the global's
  address)
- The global has linkonce_odr linkage (which means that each linkage unit must have
  its own copy of the global if it requires one, and the copy in each linkage unit
  must be the same)
- It is a constant or a function (which means that the program cannot observe that
  the unique-address rule has been broken by writing to the global)

Although this attribute could in principle be computed from the module
contents, LTO clients (i.e. linkers) will normally need to be able to compute
this property as part of symbol resolution, and it would be inefficient to
materialize every module just to compute it.

See:
http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20160509/356401.html
http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20160516/356738.html
for earlier discussion.

Part of the fix for PR27553.

Differential Revision: http://reviews.llvm.org/D20348

llvm-svn: 272709
2016-06-14 21:01:22 +00:00

460 lines
19 KiB
C++

//===---- IRBuilder.cpp - Builder for LLVM Instrs -------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the IRBuilder class, which is used as a convenient way
// to create LLVM instructions with a consistent and simplified interface.
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Statepoint.h"
using namespace llvm;
/// CreateGlobalString - Make a new global variable with an initializer that
/// has array of i8 type filled in with the nul terminated string value
/// specified. If Name is specified, it is the name of the global variable
/// created.
GlobalVariable *IRBuilderBase::CreateGlobalString(StringRef Str,
const Twine &Name,
unsigned AddressSpace) {
Constant *StrConstant = ConstantDataArray::getString(Context, Str);
Module &M = *BB->getParent()->getParent();
GlobalVariable *GV = new GlobalVariable(M, StrConstant->getType(),
true, GlobalValue::PrivateLinkage,
StrConstant, Name, nullptr,
GlobalVariable::NotThreadLocal,
AddressSpace);
GV->setUnnamedAddr(GlobalValue::UnnamedAddr::Global);
return GV;
}
Type *IRBuilderBase::getCurrentFunctionReturnType() const {
assert(BB && BB->getParent() && "No current function!");
return BB->getParent()->getReturnType();
}
Value *IRBuilderBase::getCastedInt8PtrValue(Value *Ptr) {
PointerType *PT = cast<PointerType>(Ptr->getType());
if (PT->getElementType()->isIntegerTy(8))
return Ptr;
// Otherwise, we need to insert a bitcast.
PT = getInt8PtrTy(PT->getAddressSpace());
BitCastInst *BCI = new BitCastInst(Ptr, PT, "");
BB->getInstList().insert(InsertPt, BCI);
SetInstDebugLocation(BCI);
return BCI;
}
static CallInst *createCallHelper(Value *Callee, ArrayRef<Value *> Ops,
IRBuilderBase *Builder,
const Twine& Name="") {
CallInst *CI = CallInst::Create(Callee, Ops, Name);
Builder->GetInsertBlock()->getInstList().insert(Builder->GetInsertPoint(),CI);
Builder->SetInstDebugLocation(CI);
return CI;
}
static InvokeInst *createInvokeHelper(Value *Invokee, BasicBlock *NormalDest,
BasicBlock *UnwindDest,
ArrayRef<Value *> Ops,
IRBuilderBase *Builder,
const Twine &Name = "") {
InvokeInst *II =
InvokeInst::Create(Invokee, NormalDest, UnwindDest, Ops, Name);
Builder->GetInsertBlock()->getInstList().insert(Builder->GetInsertPoint(),
II);
Builder->SetInstDebugLocation(II);
return II;
}
CallInst *IRBuilderBase::
CreateMemSet(Value *Ptr, Value *Val, Value *Size, unsigned Align,
bool isVolatile, MDNode *TBAATag, MDNode *ScopeTag,
MDNode *NoAliasTag) {
Ptr = getCastedInt8PtrValue(Ptr);
Value *Ops[] = { Ptr, Val, Size, getInt32(Align), getInt1(isVolatile) };
Type *Tys[] = { Ptr->getType(), Size->getType() };
Module *M = BB->getParent()->getParent();
Value *TheFn = Intrinsic::getDeclaration(M, Intrinsic::memset, Tys);
CallInst *CI = createCallHelper(TheFn, Ops, this);
// Set the TBAA info if present.
if (TBAATag)
CI->setMetadata(LLVMContext::MD_tbaa, TBAATag);
if (ScopeTag)
CI->setMetadata(LLVMContext::MD_alias_scope, ScopeTag);
if (NoAliasTag)
CI->setMetadata(LLVMContext::MD_noalias, NoAliasTag);
return CI;
}
CallInst *IRBuilderBase::
CreateMemCpy(Value *Dst, Value *Src, Value *Size, unsigned Align,
bool isVolatile, MDNode *TBAATag, MDNode *TBAAStructTag,
MDNode *ScopeTag, MDNode *NoAliasTag) {
Dst = getCastedInt8PtrValue(Dst);
Src = getCastedInt8PtrValue(Src);
Value *Ops[] = { Dst, Src, Size, getInt32(Align), getInt1(isVolatile) };
Type *Tys[] = { Dst->getType(), Src->getType(), Size->getType() };
Module *M = BB->getParent()->getParent();
Value *TheFn = Intrinsic::getDeclaration(M, Intrinsic::memcpy, Tys);
CallInst *CI = createCallHelper(TheFn, Ops, this);
// Set the TBAA info if present.
if (TBAATag)
CI->setMetadata(LLVMContext::MD_tbaa, TBAATag);
// Set the TBAA Struct info if present.
if (TBAAStructTag)
CI->setMetadata(LLVMContext::MD_tbaa_struct, TBAAStructTag);
if (ScopeTag)
CI->setMetadata(LLVMContext::MD_alias_scope, ScopeTag);
if (NoAliasTag)
CI->setMetadata(LLVMContext::MD_noalias, NoAliasTag);
return CI;
}
CallInst *IRBuilderBase::
CreateMemMove(Value *Dst, Value *Src, Value *Size, unsigned Align,
bool isVolatile, MDNode *TBAATag, MDNode *ScopeTag,
MDNode *NoAliasTag) {
Dst = getCastedInt8PtrValue(Dst);
Src = getCastedInt8PtrValue(Src);
Value *Ops[] = { Dst, Src, Size, getInt32(Align), getInt1(isVolatile) };
Type *Tys[] = { Dst->getType(), Src->getType(), Size->getType() };
Module *M = BB->getParent()->getParent();
Value *TheFn = Intrinsic::getDeclaration(M, Intrinsic::memmove, Tys);
CallInst *CI = createCallHelper(TheFn, Ops, this);
// Set the TBAA info if present.
if (TBAATag)
CI->setMetadata(LLVMContext::MD_tbaa, TBAATag);
if (ScopeTag)
CI->setMetadata(LLVMContext::MD_alias_scope, ScopeTag);
if (NoAliasTag)
CI->setMetadata(LLVMContext::MD_noalias, NoAliasTag);
return CI;
}
CallInst *IRBuilderBase::CreateLifetimeStart(Value *Ptr, ConstantInt *Size) {
assert(isa<PointerType>(Ptr->getType()) &&
"lifetime.start only applies to pointers.");
Ptr = getCastedInt8PtrValue(Ptr);
if (!Size)
Size = getInt64(-1);
else
assert(Size->getType() == getInt64Ty() &&
"lifetime.start requires the size to be an i64");
Value *Ops[] = { Size, Ptr };
Module *M = BB->getParent()->getParent();
Value *TheFn = Intrinsic::getDeclaration(M, Intrinsic::lifetime_start);
return createCallHelper(TheFn, Ops, this);
}
CallInst *IRBuilderBase::CreateLifetimeEnd(Value *Ptr, ConstantInt *Size) {
assert(isa<PointerType>(Ptr->getType()) &&
"lifetime.end only applies to pointers.");
Ptr = getCastedInt8PtrValue(Ptr);
if (!Size)
Size = getInt64(-1);
else
assert(Size->getType() == getInt64Ty() &&
"lifetime.end requires the size to be an i64");
Value *Ops[] = { Size, Ptr };
Module *M = BB->getParent()->getParent();
Value *TheFn = Intrinsic::getDeclaration(M, Intrinsic::lifetime_end);
return createCallHelper(TheFn, Ops, this);
}
CallInst *IRBuilderBase::CreateAssumption(Value *Cond) {
assert(Cond->getType() == getInt1Ty() &&
"an assumption condition must be of type i1");
Value *Ops[] = { Cond };
Module *M = BB->getParent()->getParent();
Value *FnAssume = Intrinsic::getDeclaration(M, Intrinsic::assume);
return createCallHelper(FnAssume, Ops, this);
}
/// \brief Create a call to a Masked Load intrinsic.
/// \p Ptr - base pointer for the load
/// \p Align - alignment of the source location
/// \p Mask - vector of booleans which indicates what vector lanes should
/// be accessed in memory
/// \p PassThru - pass-through value that is used to fill the masked-off lanes
/// of the result
/// \p Name - name of the result variable
CallInst *IRBuilderBase::CreateMaskedLoad(Value *Ptr, unsigned Align,
Value *Mask, Value *PassThru,
const Twine &Name) {
// DataTy is the overloaded type
Type *DataTy = cast<PointerType>(Ptr->getType())->getElementType();
assert(DataTy->isVectorTy() && "Ptr should point to a vector");
if (!PassThru)
PassThru = UndefValue::get(DataTy);
Value *Ops[] = { Ptr, getInt32(Align), Mask, PassThru};
return CreateMaskedIntrinsic(Intrinsic::masked_load, Ops, DataTy, Name);
}
/// \brief Create a call to a Masked Store intrinsic.
/// \p Val - data to be stored,
/// \p Ptr - base pointer for the store
/// \p Align - alignment of the destination location
/// \p Mask - vector of booleans which indicates what vector lanes should
/// be accessed in memory
CallInst *IRBuilderBase::CreateMaskedStore(Value *Val, Value *Ptr,
unsigned Align, Value *Mask) {
Value *Ops[] = { Val, Ptr, getInt32(Align), Mask };
// Type of the data to be stored - the only one overloaded type
return CreateMaskedIntrinsic(Intrinsic::masked_store, Ops, Val->getType());
}
/// Create a call to a Masked intrinsic, with given intrinsic Id,
/// an array of operands - Ops, and one overloaded type - DataTy
CallInst *IRBuilderBase::CreateMaskedIntrinsic(Intrinsic::ID Id,
ArrayRef<Value *> Ops,
Type *DataTy,
const Twine &Name) {
Module *M = BB->getParent()->getParent();
Type *OverloadedTypes[] = { DataTy };
Value *TheFn = Intrinsic::getDeclaration(M, Id, OverloadedTypes);
return createCallHelper(TheFn, Ops, this, Name);
}
/// \brief Create a call to a Masked Gather intrinsic.
/// \p Ptrs - vector of pointers for loading
/// \p Align - alignment for one element
/// \p Mask - vector of booleans which indicates what vector lanes should
/// be accessed in memory
/// \p PassThru - pass-through value that is used to fill the masked-off lanes
/// of the result
/// \p Name - name of the result variable
CallInst *IRBuilderBase::CreateMaskedGather(Value *Ptrs, unsigned Align,
Value *Mask, Value *PassThru,
const Twine& Name) {
auto PtrsTy = cast<VectorType>(Ptrs->getType());
auto PtrTy = cast<PointerType>(PtrsTy->getElementType());
unsigned NumElts = PtrsTy->getVectorNumElements();
Type *DataTy = VectorType::get(PtrTy->getElementType(), NumElts);
if (!Mask)
Mask = Constant::getAllOnesValue(VectorType::get(Type::getInt1Ty(Context),
NumElts));
Value * Ops[] = {Ptrs, getInt32(Align), Mask, UndefValue::get(DataTy)};
// We specify only one type when we create this intrinsic. Types of other
// arguments are derived from this type.
return CreateMaskedIntrinsic(Intrinsic::masked_gather, Ops, DataTy, Name);
}
/// \brief Create a call to a Masked Scatter intrinsic.
/// \p Data - data to be stored,
/// \p Ptrs - the vector of pointers, where the \p Data elements should be
/// stored
/// \p Align - alignment for one element
/// \p Mask - vector of booleans which indicates what vector lanes should
/// be accessed in memory
CallInst *IRBuilderBase::CreateMaskedScatter(Value *Data, Value *Ptrs,
unsigned Align, Value *Mask) {
auto PtrsTy = cast<VectorType>(Ptrs->getType());
auto DataTy = cast<VectorType>(Data->getType());
unsigned NumElts = PtrsTy->getVectorNumElements();
#ifndef NDEBUG
auto PtrTy = cast<PointerType>(PtrsTy->getElementType());
assert(NumElts == DataTy->getVectorNumElements() &&
PtrTy->getElementType() == DataTy->getElementType() &&
"Incompatible pointer and data types");
#endif
if (!Mask)
Mask = Constant::getAllOnesValue(VectorType::get(Type::getInt1Ty(Context),
NumElts));
Value * Ops[] = {Data, Ptrs, getInt32(Align), Mask};
// We specify only one type when we create this intrinsic. Types of other
// arguments are derived from this type.
return CreateMaskedIntrinsic(Intrinsic::masked_scatter, Ops, DataTy);
}
template <typename T0, typename T1, typename T2, typename T3>
static std::vector<Value *>
getStatepointArgs(IRBuilderBase &B, uint64_t ID, uint32_t NumPatchBytes,
Value *ActualCallee, uint32_t Flags, ArrayRef<T0> CallArgs,
ArrayRef<T1> TransitionArgs, ArrayRef<T2> DeoptArgs,
ArrayRef<T3> GCArgs) {
std::vector<Value *> Args;
Args.push_back(B.getInt64(ID));
Args.push_back(B.getInt32(NumPatchBytes));
Args.push_back(ActualCallee);
Args.push_back(B.getInt32(CallArgs.size()));
Args.push_back(B.getInt32(Flags));
Args.insert(Args.end(), CallArgs.begin(), CallArgs.end());
Args.push_back(B.getInt32(TransitionArgs.size()));
Args.insert(Args.end(), TransitionArgs.begin(), TransitionArgs.end());
Args.push_back(B.getInt32(DeoptArgs.size()));
Args.insert(Args.end(), DeoptArgs.begin(), DeoptArgs.end());
Args.insert(Args.end(), GCArgs.begin(), GCArgs.end());
return Args;
}
template <typename T0, typename T1, typename T2, typename T3>
static CallInst *CreateGCStatepointCallCommon(
IRBuilderBase *Builder, uint64_t ID, uint32_t NumPatchBytes,
Value *ActualCallee, uint32_t Flags, ArrayRef<T0> CallArgs,
ArrayRef<T1> TransitionArgs, ArrayRef<T2> DeoptArgs, ArrayRef<T3> GCArgs,
const Twine &Name) {
// Extract out the type of the callee.
PointerType *FuncPtrType = cast<PointerType>(ActualCallee->getType());
assert(isa<FunctionType>(FuncPtrType->getElementType()) &&
"actual callee must be a callable value");
Module *M = Builder->GetInsertBlock()->getParent()->getParent();
// Fill in the one generic type'd argument (the function is also vararg)
Type *ArgTypes[] = { FuncPtrType };
Function *FnStatepoint =
Intrinsic::getDeclaration(M, Intrinsic::experimental_gc_statepoint,
ArgTypes);
std::vector<llvm::Value *> Args =
getStatepointArgs(*Builder, ID, NumPatchBytes, ActualCallee, Flags,
CallArgs, TransitionArgs, DeoptArgs, GCArgs);
return createCallHelper(FnStatepoint, Args, Builder, Name);
}
CallInst *IRBuilderBase::CreateGCStatepointCall(
uint64_t ID, uint32_t NumPatchBytes, Value *ActualCallee,
ArrayRef<Value *> CallArgs, ArrayRef<Value *> DeoptArgs,
ArrayRef<Value *> GCArgs, const Twine &Name) {
return CreateGCStatepointCallCommon<Value *, Value *, Value *, Value *>(
this, ID, NumPatchBytes, ActualCallee, uint32_t(StatepointFlags::None),
CallArgs, None /* No Transition Args */, DeoptArgs, GCArgs, Name);
}
CallInst *IRBuilderBase::CreateGCStatepointCall(
uint64_t ID, uint32_t NumPatchBytes, Value *ActualCallee, uint32_t Flags,
ArrayRef<Use> CallArgs, ArrayRef<Use> TransitionArgs,
ArrayRef<Use> DeoptArgs, ArrayRef<Value *> GCArgs, const Twine &Name) {
return CreateGCStatepointCallCommon<Use, Use, Use, Value *>(
this, ID, NumPatchBytes, ActualCallee, Flags, CallArgs, TransitionArgs,
DeoptArgs, GCArgs, Name);
}
CallInst *IRBuilderBase::CreateGCStatepointCall(
uint64_t ID, uint32_t NumPatchBytes, Value *ActualCallee,
ArrayRef<Use> CallArgs, ArrayRef<Value *> DeoptArgs,
ArrayRef<Value *> GCArgs, const Twine &Name) {
return CreateGCStatepointCallCommon<Use, Value *, Value *, Value *>(
this, ID, NumPatchBytes, ActualCallee, uint32_t(StatepointFlags::None),
CallArgs, None, DeoptArgs, GCArgs, Name);
}
template <typename T0, typename T1, typename T2, typename T3>
static InvokeInst *CreateGCStatepointInvokeCommon(
IRBuilderBase *Builder, uint64_t ID, uint32_t NumPatchBytes,
Value *ActualInvokee, BasicBlock *NormalDest, BasicBlock *UnwindDest,
uint32_t Flags, ArrayRef<T0> InvokeArgs, ArrayRef<T1> TransitionArgs,
ArrayRef<T2> DeoptArgs, ArrayRef<T3> GCArgs, const Twine &Name) {
// Extract out the type of the callee.
PointerType *FuncPtrType = cast<PointerType>(ActualInvokee->getType());
assert(isa<FunctionType>(FuncPtrType->getElementType()) &&
"actual callee must be a callable value");
Module *M = Builder->GetInsertBlock()->getParent()->getParent();
// Fill in the one generic type'd argument (the function is also vararg)
Function *FnStatepoint = Intrinsic::getDeclaration(
M, Intrinsic::experimental_gc_statepoint, {FuncPtrType});
std::vector<llvm::Value *> Args =
getStatepointArgs(*Builder, ID, NumPatchBytes, ActualInvokee, Flags,
InvokeArgs, TransitionArgs, DeoptArgs, GCArgs);
return createInvokeHelper(FnStatepoint, NormalDest, UnwindDest, Args, Builder,
Name);
}
InvokeInst *IRBuilderBase::CreateGCStatepointInvoke(
uint64_t ID, uint32_t NumPatchBytes, Value *ActualInvokee,
BasicBlock *NormalDest, BasicBlock *UnwindDest,
ArrayRef<Value *> InvokeArgs, ArrayRef<Value *> DeoptArgs,
ArrayRef<Value *> GCArgs, const Twine &Name) {
return CreateGCStatepointInvokeCommon<Value *, Value *, Value *, Value *>(
this, ID, NumPatchBytes, ActualInvokee, NormalDest, UnwindDest,
uint32_t(StatepointFlags::None), InvokeArgs, None /* No Transition Args*/,
DeoptArgs, GCArgs, Name);
}
InvokeInst *IRBuilderBase::CreateGCStatepointInvoke(
uint64_t ID, uint32_t NumPatchBytes, Value *ActualInvokee,
BasicBlock *NormalDest, BasicBlock *UnwindDest, uint32_t Flags,
ArrayRef<Use> InvokeArgs, ArrayRef<Use> TransitionArgs,
ArrayRef<Use> DeoptArgs, ArrayRef<Value *> GCArgs, const Twine &Name) {
return CreateGCStatepointInvokeCommon<Use, Use, Use, Value *>(
this, ID, NumPatchBytes, ActualInvokee, NormalDest, UnwindDest, Flags,
InvokeArgs, TransitionArgs, DeoptArgs, GCArgs, Name);
}
InvokeInst *IRBuilderBase::CreateGCStatepointInvoke(
uint64_t ID, uint32_t NumPatchBytes, Value *ActualInvokee,
BasicBlock *NormalDest, BasicBlock *UnwindDest, ArrayRef<Use> InvokeArgs,
ArrayRef<Value *> DeoptArgs, ArrayRef<Value *> GCArgs, const Twine &Name) {
return CreateGCStatepointInvokeCommon<Use, Value *, Value *, Value *>(
this, ID, NumPatchBytes, ActualInvokee, NormalDest, UnwindDest,
uint32_t(StatepointFlags::None), InvokeArgs, None, DeoptArgs, GCArgs,
Name);
}
CallInst *IRBuilderBase::CreateGCResult(Instruction *Statepoint,
Type *ResultType,
const Twine &Name) {
Intrinsic::ID ID = Intrinsic::experimental_gc_result;
Module *M = BB->getParent()->getParent();
Type *Types[] = {ResultType};
Value *FnGCResult = Intrinsic::getDeclaration(M, ID, Types);
Value *Args[] = {Statepoint};
return createCallHelper(FnGCResult, Args, this, Name);
}
CallInst *IRBuilderBase::CreateGCRelocate(Instruction *Statepoint,
int BaseOffset,
int DerivedOffset,
Type *ResultType,
const Twine &Name) {
Module *M = BB->getParent()->getParent();
Type *Types[] = {ResultType};
Value *FnGCRelocate =
Intrinsic::getDeclaration(M, Intrinsic::experimental_gc_relocate, Types);
Value *Args[] = {Statepoint,
getInt32(BaseOffset),
getInt32(DerivedOffset)};
return createCallHelper(FnGCRelocate, Args, this, Name);
}