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llvm-mirror/lib/IR/Attributes.cpp
Nick Desaulniers e95a065d26 [IR] add fn attr for no_stack_protector; prevent inlining on mismatch 
It's currently ambiguous in IR whether the source language explicitly
did not want a stack a stack protector (in C, via function attribute
no_stack_protector) or doesn't care for any given function.

It's common for code that manipulates the stack via inline assembly or
that has to set up its own stack canary (such as the Linux kernel) would
like to avoid stack protectors in certain functions. In this case, we've
been bitten by numerous bugs where a callee with a stack protector is
inlined into an __attribute__((__no_stack_protector__)) caller, which
generally breaks the caller's assumptions about not having a stack
protector. LTO exacerbates the issue.

While developers can avoid this by putting all no_stack_protector
functions in one translation unit together and compiling those with
-fno-stack-protector, it's generally not very ergonomic or as
ergonomic as a function attribute, and still doesn't work for LTO. See also:
https://lore.kernel.org/linux-pm/20200915172658.1432732-1-rkir@google.com/
https://lore.kernel.org/lkml/20200918201436.2932360-30-samitolvanen@google.com/T/#u

Typically, when inlining a callee into a caller, the caller will be
upgraded in its level of stack protection (see adjustCallerSSPLevel()).
By adding an explicit attribute in the IR when the function attribute is
used in the source language, we can now identify such cases and prevent
inlining.  Block inlining when the callee and caller differ in the case that one
contains `nossp` when the other has `ssp`, `sspstrong`, or `sspreq`.

Fixes pr/47479.

Reviewed By: void

Differential Revision: https://reviews.llvm.org/D87956
2020-10-23 11:55:39 -07:00

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//===- Attributes.cpp - Implement AttributesList --------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// \file
// This file implements the Attribute, AttributeImpl, AttrBuilder,
// AttributeListImpl, and AttributeList classes.
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/Attributes.h"
#include "AttributeImpl.h"
#include "LLVMContextImpl.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/FoldingSet.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Type.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cassert>
#include <climits>
#include <cstddef>
#include <cstdint>
#include <limits>
#include <string>
#include <tuple>
#include <utility>
using namespace llvm;
//===----------------------------------------------------------------------===//
// Attribute Construction Methods
//===----------------------------------------------------------------------===//
// allocsize has two integer arguments, but because they're both 32 bits, we can
// pack them into one 64-bit value, at the cost of making said value
// nonsensical.
//
// In order to do this, we need to reserve one value of the second (optional)
// allocsize argument to signify "not present."
static const unsigned AllocSizeNumElemsNotPresent = -1;
static uint64_t packAllocSizeArgs(unsigned ElemSizeArg,
const Optional<unsigned> &NumElemsArg) {
assert((!NumElemsArg.hasValue() ||
*NumElemsArg != AllocSizeNumElemsNotPresent) &&
"Attempting to pack a reserved value");
return uint64_t(ElemSizeArg) << 32 |
NumElemsArg.getValueOr(AllocSizeNumElemsNotPresent);
}
static std::pair<unsigned, Optional<unsigned>>
unpackAllocSizeArgs(uint64_t Num) {
unsigned NumElems = Num & std::numeric_limits<unsigned>::max();
unsigned ElemSizeArg = Num >> 32;
Optional<unsigned> NumElemsArg;
if (NumElems != AllocSizeNumElemsNotPresent)
NumElemsArg = NumElems;
return std::make_pair(ElemSizeArg, NumElemsArg);
}
Attribute Attribute::get(LLVMContext &Context, Attribute::AttrKind Kind,
uint64_t Val) {
LLVMContextImpl *pImpl = Context.pImpl;
FoldingSetNodeID ID;
ID.AddInteger(Kind);
if (Val) ID.AddInteger(Val);
void *InsertPoint;
AttributeImpl *PA = pImpl->AttrsSet.FindNodeOrInsertPos(ID, InsertPoint);
if (!PA) {
// If we didn't find any existing attributes of the same shape then create a
// new one and insert it.
if (!Val)
PA = new (pImpl->Alloc) EnumAttributeImpl(Kind);
else
PA = new (pImpl->Alloc) IntAttributeImpl(Kind, Val);
pImpl->AttrsSet.InsertNode(PA, InsertPoint);
}
// Return the Attribute that we found or created.
return Attribute(PA);
}
Attribute Attribute::get(LLVMContext &Context, StringRef Kind, StringRef Val) {
LLVMContextImpl *pImpl = Context.pImpl;
FoldingSetNodeID ID;
ID.AddString(Kind);
if (!Val.empty()) ID.AddString(Val);
void *InsertPoint;
AttributeImpl *PA = pImpl->AttrsSet.FindNodeOrInsertPos(ID, InsertPoint);
if (!PA) {
// If we didn't find any existing attributes of the same shape then create a
// new one and insert it.
void *Mem =
pImpl->Alloc.Allocate(StringAttributeImpl::totalSizeToAlloc(Kind, Val),
alignof(StringAttributeImpl));
PA = new (Mem) StringAttributeImpl(Kind, Val);
pImpl->AttrsSet.InsertNode(PA, InsertPoint);
}
// Return the Attribute that we found or created.
return Attribute(PA);
}
Attribute Attribute::get(LLVMContext &Context, Attribute::AttrKind Kind,
Type *Ty) {
LLVMContextImpl *pImpl = Context.pImpl;
FoldingSetNodeID ID;
ID.AddInteger(Kind);
ID.AddPointer(Ty);
void *InsertPoint;
AttributeImpl *PA = pImpl->AttrsSet.FindNodeOrInsertPos(ID, InsertPoint);
if (!PA) {
// If we didn't find any existing attributes of the same shape then create a
// new one and insert it.
PA = new (pImpl->Alloc) TypeAttributeImpl(Kind, Ty);
pImpl->AttrsSet.InsertNode(PA, InsertPoint);
}
// Return the Attribute that we found or created.
return Attribute(PA);
}
Attribute Attribute::getWithAlignment(LLVMContext &Context, Align A) {
assert(A <= llvm::Value::MaximumAlignment && "Alignment too large.");
return get(Context, Alignment, A.value());
}
Attribute Attribute::getWithStackAlignment(LLVMContext &Context, Align A) {
assert(A <= 0x100 && "Alignment too large.");
return get(Context, StackAlignment, A.value());
}
Attribute Attribute::getWithDereferenceableBytes(LLVMContext &Context,
uint64_t Bytes) {
assert(Bytes && "Bytes must be non-zero.");
return get(Context, Dereferenceable, Bytes);
}
Attribute Attribute::getWithDereferenceableOrNullBytes(LLVMContext &Context,
uint64_t Bytes) {
assert(Bytes && "Bytes must be non-zero.");
return get(Context, DereferenceableOrNull, Bytes);
}
Attribute Attribute::getWithByValType(LLVMContext &Context, Type *Ty) {
return get(Context, ByVal, Ty);
}
Attribute Attribute::getWithStructRetType(LLVMContext &Context, Type *Ty) {
return get(Context, StructRet, Ty);
}
Attribute Attribute::getWithByRefType(LLVMContext &Context, Type *Ty) {
return get(Context, ByRef, Ty);
}
Attribute Attribute::getWithPreallocatedType(LLVMContext &Context, Type *Ty) {
return get(Context, Preallocated, Ty);
}
Attribute
Attribute::getWithAllocSizeArgs(LLVMContext &Context, unsigned ElemSizeArg,
const Optional<unsigned> &NumElemsArg) {
assert(!(ElemSizeArg == 0 && NumElemsArg && *NumElemsArg == 0) &&
"Invalid allocsize arguments -- given allocsize(0, 0)");
return get(Context, AllocSize, packAllocSizeArgs(ElemSizeArg, NumElemsArg));
}
Attribute::AttrKind Attribute::getAttrKindFromName(StringRef AttrName) {
return StringSwitch<Attribute::AttrKind>(AttrName)
#define GET_ATTR_NAMES
#define ATTRIBUTE_ENUM(ENUM_NAME, DISPLAY_NAME) \
.Case(#DISPLAY_NAME, Attribute::ENUM_NAME)
#include "llvm/IR/Attributes.inc"
.Default(Attribute::None);
}
StringRef Attribute::getNameFromAttrKind(Attribute::AttrKind AttrKind) {
switch (AttrKind) {
#define GET_ATTR_NAMES
#define ATTRIBUTE_ENUM(ENUM_NAME, DISPLAY_NAME) \
case Attribute::ENUM_NAME: \
return #DISPLAY_NAME;
#include "llvm/IR/Attributes.inc"
case Attribute::None:
return "none";
default:
llvm_unreachable("invalid Kind");
}
}
bool Attribute::doesAttrKindHaveArgument(Attribute::AttrKind AttrKind) {
return AttrKind == Attribute::Alignment ||
AttrKind == Attribute::StackAlignment ||
AttrKind == Attribute::Dereferenceable ||
AttrKind == Attribute::AllocSize ||
AttrKind == Attribute::DereferenceableOrNull;
}
bool Attribute::isExistingAttribute(StringRef Name) {
return StringSwitch<bool>(Name)
#define GET_ATTR_NAMES
#define ATTRIBUTE_ALL(ENUM_NAME, DISPLAY_NAME) .Case(#DISPLAY_NAME, true)
#include "llvm/IR/Attributes.inc"
.Default(false);
}
//===----------------------------------------------------------------------===//
// Attribute Accessor Methods
//===----------------------------------------------------------------------===//
bool Attribute::isEnumAttribute() const {
return pImpl && pImpl->isEnumAttribute();
}
bool Attribute::isIntAttribute() const {
return pImpl && pImpl->isIntAttribute();
}
bool Attribute::isStringAttribute() const {
return pImpl && pImpl->isStringAttribute();
}
bool Attribute::isTypeAttribute() const {
return pImpl && pImpl->isTypeAttribute();
}
Attribute::AttrKind Attribute::getKindAsEnum() const {
if (!pImpl) return None;
assert((isEnumAttribute() || isIntAttribute() || isTypeAttribute()) &&
"Invalid attribute type to get the kind as an enum!");
return pImpl->getKindAsEnum();
}
uint64_t Attribute::getValueAsInt() const {
if (!pImpl) return 0;
assert(isIntAttribute() &&
"Expected the attribute to be an integer attribute!");
return pImpl->getValueAsInt();
}
StringRef Attribute::getKindAsString() const {
if (!pImpl) return {};
assert(isStringAttribute() &&
"Invalid attribute type to get the kind as a string!");
return pImpl->getKindAsString();
}
StringRef Attribute::getValueAsString() const {
if (!pImpl) return {};
assert(isStringAttribute() &&
"Invalid attribute type to get the value as a string!");
return pImpl->getValueAsString();
}
Type *Attribute::getValueAsType() const {
if (!pImpl) return {};
assert(isTypeAttribute() &&
"Invalid attribute type to get the value as a type!");
return pImpl->getValueAsType();
}
bool Attribute::hasAttribute(AttrKind Kind) const {
return (pImpl && pImpl->hasAttribute(Kind)) || (!pImpl && Kind == None);
}
bool Attribute::hasAttribute(StringRef Kind) const {
if (!isStringAttribute()) return false;
return pImpl && pImpl->hasAttribute(Kind);
}
MaybeAlign Attribute::getAlignment() const {
assert(hasAttribute(Attribute::Alignment) &&
"Trying to get alignment from non-alignment attribute!");
return MaybeAlign(pImpl->getValueAsInt());
}
MaybeAlign Attribute::getStackAlignment() const {
assert(hasAttribute(Attribute::StackAlignment) &&
"Trying to get alignment from non-alignment attribute!");
return MaybeAlign(pImpl->getValueAsInt());
}
uint64_t Attribute::getDereferenceableBytes() const {
assert(hasAttribute(Attribute::Dereferenceable) &&
"Trying to get dereferenceable bytes from "
"non-dereferenceable attribute!");
return pImpl->getValueAsInt();
}
uint64_t Attribute::getDereferenceableOrNullBytes() const {
assert(hasAttribute(Attribute::DereferenceableOrNull) &&
"Trying to get dereferenceable bytes from "
"non-dereferenceable attribute!");
return pImpl->getValueAsInt();
}
std::pair<unsigned, Optional<unsigned>> Attribute::getAllocSizeArgs() const {
assert(hasAttribute(Attribute::AllocSize) &&
"Trying to get allocsize args from non-allocsize attribute");
return unpackAllocSizeArgs(pImpl->getValueAsInt());
}
std::string Attribute::getAsString(bool InAttrGrp) const {
if (!pImpl) return {};
if (hasAttribute(Attribute::SanitizeAddress))
return "sanitize_address";
if (hasAttribute(Attribute::SanitizeHWAddress))
return "sanitize_hwaddress";
if (hasAttribute(Attribute::SanitizeMemTag))
return "sanitize_memtag";
if (hasAttribute(Attribute::AlwaysInline))
return "alwaysinline";
if (hasAttribute(Attribute::ArgMemOnly))
return "argmemonly";
if (hasAttribute(Attribute::Builtin))
return "builtin";
if (hasAttribute(Attribute::Convergent))
return "convergent";
if (hasAttribute(Attribute::SwiftError))
return "swifterror";
if (hasAttribute(Attribute::SwiftSelf))
return "swiftself";
if (hasAttribute(Attribute::InaccessibleMemOnly))
return "inaccessiblememonly";
if (hasAttribute(Attribute::InaccessibleMemOrArgMemOnly))
return "inaccessiblemem_or_argmemonly";
if (hasAttribute(Attribute::InAlloca))
return "inalloca";
if (hasAttribute(Attribute::InlineHint))
return "inlinehint";
if (hasAttribute(Attribute::InReg))
return "inreg";
if (hasAttribute(Attribute::JumpTable))
return "jumptable";
if (hasAttribute(Attribute::MinSize))
return "minsize";
if (hasAttribute(Attribute::Naked))
return "naked";
if (hasAttribute(Attribute::Nest))
return "nest";
if (hasAttribute(Attribute::NoAlias))
return "noalias";
if (hasAttribute(Attribute::NoBuiltin))
return "nobuiltin";
if (hasAttribute(Attribute::NoCapture))
return "nocapture";
if (hasAttribute(Attribute::NoDuplicate))
return "noduplicate";
if (hasAttribute(Attribute::NoFree))
return "nofree";
if (hasAttribute(Attribute::NoImplicitFloat))
return "noimplicitfloat";
if (hasAttribute(Attribute::NoInline))
return "noinline";
if (hasAttribute(Attribute::NonLazyBind))
return "nonlazybind";
if (hasAttribute(Attribute::NoMerge))
return "nomerge";
if (hasAttribute(Attribute::NonNull))
return "nonnull";
if (hasAttribute(Attribute::NoRedZone))
return "noredzone";
if (hasAttribute(Attribute::NoReturn))
return "noreturn";
if (hasAttribute(Attribute::NoSync))
return "nosync";
if (hasAttribute(Attribute::NullPointerIsValid))
return "null_pointer_is_valid";
if (hasAttribute(Attribute::WillReturn))
return "willreturn";
if (hasAttribute(Attribute::NoCfCheck))
return "nocf_check";
if (hasAttribute(Attribute::NoRecurse))
return "norecurse";
if (hasAttribute(Attribute::NoUnwind))
return "nounwind";
if (hasAttribute(Attribute::OptForFuzzing))
return "optforfuzzing";
if (hasAttribute(Attribute::OptimizeNone))
return "optnone";
if (hasAttribute(Attribute::OptimizeForSize))
return "optsize";
if (hasAttribute(Attribute::ReadNone))
return "readnone";
if (hasAttribute(Attribute::ReadOnly))
return "readonly";
if (hasAttribute(Attribute::WriteOnly))
return "writeonly";
if (hasAttribute(Attribute::Returned))
return "returned";
if (hasAttribute(Attribute::ReturnsTwice))
return "returns_twice";
if (hasAttribute(Attribute::SExt))
return "signext";
if (hasAttribute(Attribute::SpeculativeLoadHardening))
return "speculative_load_hardening";
if (hasAttribute(Attribute::Speculatable))
return "speculatable";
if (hasAttribute(Attribute::NoStackProtect))
return "nossp";
if (hasAttribute(Attribute::StackProtect))
return "ssp";
if (hasAttribute(Attribute::StackProtectReq))
return "sspreq";
if (hasAttribute(Attribute::StackProtectStrong))
return "sspstrong";
if (hasAttribute(Attribute::SafeStack))
return "safestack";
if (hasAttribute(Attribute::ShadowCallStack))
return "shadowcallstack";
if (hasAttribute(Attribute::StrictFP))
return "strictfp";
if (hasAttribute(Attribute::SanitizeThread))
return "sanitize_thread";
if (hasAttribute(Attribute::SanitizeMemory))
return "sanitize_memory";
if (hasAttribute(Attribute::UWTable))
return "uwtable";
if (hasAttribute(Attribute::ZExt))
return "zeroext";
if (hasAttribute(Attribute::Cold))
return "cold";
if (hasAttribute(Attribute::ImmArg))
return "immarg";
if (hasAttribute(Attribute::NoUndef))
return "noundef";
if (hasAttribute(Attribute::MustProgress))
return "mustprogress";
const bool IsByVal = hasAttribute(Attribute::ByVal);
if (IsByVal || hasAttribute(Attribute::StructRet)) {
std::string Result;
Result += IsByVal ? "byval" : "sret";
if (Type *Ty = getValueAsType()) {
raw_string_ostream OS(Result);
Result += '(';
Ty->print(OS, false, true);
OS.flush();
Result += ')';
}
return Result;
}
const bool IsByRef = hasAttribute(Attribute::ByRef);
if (IsByRef || hasAttribute(Attribute::Preallocated)) {
std::string Result = IsByRef ? "byref" : "preallocated";
raw_string_ostream OS(Result);
Result += '(';
getValueAsType()->print(OS, false, true);
OS.flush();
Result += ')';
return Result;
}
// FIXME: These should be output like this:
//
// align=4
// alignstack=8
//
if (hasAttribute(Attribute::Alignment)) {
std::string Result;
Result += "align";
Result += (InAttrGrp) ? "=" : " ";
Result += utostr(getValueAsInt());
return Result;
}
auto AttrWithBytesToString = [&](const char *Name) {
std::string Result;
Result += Name;
if (InAttrGrp) {
Result += "=";
Result += utostr(getValueAsInt());
} else {
Result += "(";
Result += utostr(getValueAsInt());
Result += ")";
}
return Result;
};
if (hasAttribute(Attribute::StackAlignment))
return AttrWithBytesToString("alignstack");
if (hasAttribute(Attribute::Dereferenceable))
return AttrWithBytesToString("dereferenceable");
if (hasAttribute(Attribute::DereferenceableOrNull))
return AttrWithBytesToString("dereferenceable_or_null");
if (hasAttribute(Attribute::AllocSize)) {
unsigned ElemSize;
Optional<unsigned> NumElems;
std::tie(ElemSize, NumElems) = getAllocSizeArgs();
std::string Result = "allocsize(";
Result += utostr(ElemSize);
if (NumElems.hasValue()) {
Result += ',';
Result += utostr(*NumElems);
}
Result += ')';
return Result;
}
// Convert target-dependent attributes to strings of the form:
//
// "kind"
// "kind" = "value"
//
if (isStringAttribute()) {
std::string Result;
{
raw_string_ostream OS(Result);
OS << '"' << getKindAsString() << '"';
// Since some attribute strings contain special characters that cannot be
// printable, those have to be escaped to make the attribute value
// printable as is. e.g. "\01__gnu_mcount_nc"
const auto &AttrVal = pImpl->getValueAsString();
if (!AttrVal.empty()) {
OS << "=\"";
printEscapedString(AttrVal, OS);
OS << "\"";
}
}
return Result;
}
llvm_unreachable("Unknown attribute");
}
bool Attribute::operator<(Attribute A) const {
if (!pImpl && !A.pImpl) return false;
if (!pImpl) return true;
if (!A.pImpl) return false;
return *pImpl < *A.pImpl;
}
void Attribute::Profile(FoldingSetNodeID &ID) const {
ID.AddPointer(pImpl);
}
//===----------------------------------------------------------------------===//
// AttributeImpl Definition
//===----------------------------------------------------------------------===//
bool AttributeImpl::hasAttribute(Attribute::AttrKind A) const {
if (isStringAttribute()) return false;
return getKindAsEnum() == A;
}
bool AttributeImpl::hasAttribute(StringRef Kind) const {
if (!isStringAttribute()) return false;
return getKindAsString() == Kind;
}
Attribute::AttrKind AttributeImpl::getKindAsEnum() const {
assert(isEnumAttribute() || isIntAttribute() || isTypeAttribute());
return static_cast<const EnumAttributeImpl *>(this)->getEnumKind();
}
uint64_t AttributeImpl::getValueAsInt() const {
assert(isIntAttribute());
return static_cast<const IntAttributeImpl *>(this)->getValue();
}
StringRef AttributeImpl::getKindAsString() const {
assert(isStringAttribute());
return static_cast<const StringAttributeImpl *>(this)->getStringKind();
}
StringRef AttributeImpl::getValueAsString() const {
assert(isStringAttribute());
return static_cast<const StringAttributeImpl *>(this)->getStringValue();
}
Type *AttributeImpl::getValueAsType() const {
assert(isTypeAttribute());
return static_cast<const TypeAttributeImpl *>(this)->getTypeValue();
}
bool AttributeImpl::operator<(const AttributeImpl &AI) const {
if (this == &AI)
return false;
// This sorts the attributes with Attribute::AttrKinds coming first (sorted
// relative to their enum value) and then strings.
if (isEnumAttribute()) {
if (AI.isEnumAttribute()) return getKindAsEnum() < AI.getKindAsEnum();
if (AI.isIntAttribute()) return true;
if (AI.isStringAttribute()) return true;
if (AI.isTypeAttribute()) return true;
}
if (isTypeAttribute()) {
if (AI.isEnumAttribute()) return false;
if (AI.isTypeAttribute()) {
assert(getKindAsEnum() != AI.getKindAsEnum() &&
"Comparison of types would be unstable");
return getKindAsEnum() < AI.getKindAsEnum();
}
if (AI.isIntAttribute()) return true;
if (AI.isStringAttribute()) return true;
}
if (isIntAttribute()) {
if (AI.isEnumAttribute()) return false;
if (AI.isTypeAttribute()) return false;
if (AI.isIntAttribute()) {
if (getKindAsEnum() == AI.getKindAsEnum())
return getValueAsInt() < AI.getValueAsInt();
return getKindAsEnum() < AI.getKindAsEnum();
}
if (AI.isStringAttribute()) return true;
}
assert(isStringAttribute());
if (AI.isEnumAttribute()) return false;
if (AI.isTypeAttribute()) return false;
if (AI.isIntAttribute()) return false;
if (getKindAsString() == AI.getKindAsString())
return getValueAsString() < AI.getValueAsString();
return getKindAsString() < AI.getKindAsString();
}
//===----------------------------------------------------------------------===//
// AttributeSet Definition
//===----------------------------------------------------------------------===//
AttributeSet AttributeSet::get(LLVMContext &C, const AttrBuilder &B) {
return AttributeSet(AttributeSetNode::get(C, B));
}
AttributeSet AttributeSet::get(LLVMContext &C, ArrayRef<Attribute> Attrs) {
return AttributeSet(AttributeSetNode::get(C, Attrs));
}
AttributeSet AttributeSet::addAttribute(LLVMContext &C,
Attribute::AttrKind Kind) const {
if (hasAttribute(Kind)) return *this;
AttrBuilder B;
B.addAttribute(Kind);
return addAttributes(C, AttributeSet::get(C, B));
}
AttributeSet AttributeSet::addAttribute(LLVMContext &C, StringRef Kind,
StringRef Value) const {
AttrBuilder B;
B.addAttribute(Kind, Value);
return addAttributes(C, AttributeSet::get(C, B));
}
AttributeSet AttributeSet::addAttributes(LLVMContext &C,
const AttributeSet AS) const {
if (!hasAttributes())
return AS;
if (!AS.hasAttributes())
return *this;
AttrBuilder B(AS);
for (const auto &I : *this)
B.addAttribute(I);
return get(C, B);
}
AttributeSet AttributeSet::removeAttribute(LLVMContext &C,
Attribute::AttrKind Kind) const {
if (!hasAttribute(Kind)) return *this;
AttrBuilder B(*this);
B.removeAttribute(Kind);
return get(C, B);
}
AttributeSet AttributeSet::removeAttribute(LLVMContext &C,
StringRef Kind) const {
if (!hasAttribute(Kind)) return *this;
AttrBuilder B(*this);
B.removeAttribute(Kind);
return get(C, B);
}
AttributeSet AttributeSet::removeAttributes(LLVMContext &C,
const AttrBuilder &Attrs) const {
AttrBuilder B(*this);
B.remove(Attrs);
return get(C, B);
}
unsigned AttributeSet::getNumAttributes() const {
return SetNode ? SetNode->getNumAttributes() : 0;
}
bool AttributeSet::hasAttribute(Attribute::AttrKind Kind) const {
return SetNode ? SetNode->hasAttribute(Kind) : false;
}
bool AttributeSet::hasAttribute(StringRef Kind) const {
return SetNode ? SetNode->hasAttribute(Kind) : false;
}
Attribute AttributeSet::getAttribute(Attribute::AttrKind Kind) const {
return SetNode ? SetNode->getAttribute(Kind) : Attribute();
}
Attribute AttributeSet::getAttribute(StringRef Kind) const {
return SetNode ? SetNode->getAttribute(Kind) : Attribute();
}
MaybeAlign AttributeSet::getAlignment() const {
return SetNode ? SetNode->getAlignment() : None;
}
MaybeAlign AttributeSet::getStackAlignment() const {
return SetNode ? SetNode->getStackAlignment() : None;
}
uint64_t AttributeSet::getDereferenceableBytes() const {
return SetNode ? SetNode->getDereferenceableBytes() : 0;
}
uint64_t AttributeSet::getDereferenceableOrNullBytes() const {
return SetNode ? SetNode->getDereferenceableOrNullBytes() : 0;
}
Type *AttributeSet::getByRefType() const {
return SetNode ? SetNode->getByRefType() : nullptr;
}
Type *AttributeSet::getByValType() const {
return SetNode ? SetNode->getByValType() : nullptr;
}
Type *AttributeSet::getStructRetType() const {
return SetNode ? SetNode->getStructRetType() : nullptr;
}
Type *AttributeSet::getPreallocatedType() const {
return SetNode ? SetNode->getPreallocatedType() : nullptr;
}
std::pair<unsigned, Optional<unsigned>> AttributeSet::getAllocSizeArgs() const {
return SetNode ? SetNode->getAllocSizeArgs()
: std::pair<unsigned, Optional<unsigned>>(0, 0);
}
std::string AttributeSet::getAsString(bool InAttrGrp) const {
return SetNode ? SetNode->getAsString(InAttrGrp) : "";
}
AttributeSet::iterator AttributeSet::begin() const {
return SetNode ? SetNode->begin() : nullptr;
}
AttributeSet::iterator AttributeSet::end() const {
return SetNode ? SetNode->end() : nullptr;
}
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void AttributeSet::dump() const {
dbgs() << "AS =\n";
dbgs() << " { ";
dbgs() << getAsString(true) << " }\n";
}
#endif
//===----------------------------------------------------------------------===//
// AttributeSetNode Definition
//===----------------------------------------------------------------------===//
AttributeSetNode::AttributeSetNode(ArrayRef<Attribute> Attrs)
: NumAttrs(Attrs.size()) {
// There's memory after the node where we can store the entries in.
llvm::copy(Attrs, getTrailingObjects<Attribute>());
for (const auto &I : *this) {
if (I.isStringAttribute())
StringAttrs.insert({ I.getKindAsString(), I });
else
AvailableAttrs.addAttribute(I.getKindAsEnum());
}
}
AttributeSetNode *AttributeSetNode::get(LLVMContext &C,
ArrayRef<Attribute> Attrs) {
SmallVector<Attribute, 8> SortedAttrs(Attrs.begin(), Attrs.end());
llvm::sort(SortedAttrs);
return getSorted(C, SortedAttrs);
}
AttributeSetNode *AttributeSetNode::getSorted(LLVMContext &C,
ArrayRef<Attribute> SortedAttrs) {
if (SortedAttrs.empty())
return nullptr;
// Build a key to look up the existing attributes.
LLVMContextImpl *pImpl = C.pImpl;
FoldingSetNodeID ID;
assert(llvm::is_sorted(SortedAttrs) && "Expected sorted attributes!");
for (const auto &Attr : SortedAttrs)
Attr.Profile(ID);
void *InsertPoint;
AttributeSetNode *PA =
pImpl->AttrsSetNodes.FindNodeOrInsertPos(ID, InsertPoint);
// If we didn't find any existing attributes of the same shape then create a
// new one and insert it.
if (!PA) {
// Coallocate entries after the AttributeSetNode itself.
void *Mem = ::operator new(totalSizeToAlloc<Attribute>(SortedAttrs.size()));
PA = new (Mem) AttributeSetNode(SortedAttrs);
pImpl->AttrsSetNodes.InsertNode(PA, InsertPoint);
}
// Return the AttributeSetNode that we found or created.
return PA;
}
AttributeSetNode *AttributeSetNode::get(LLVMContext &C, const AttrBuilder &B) {
// Add target-independent attributes.
SmallVector<Attribute, 8> Attrs;
for (Attribute::AttrKind Kind = Attribute::None;
Kind != Attribute::EndAttrKinds; Kind = Attribute::AttrKind(Kind + 1)) {
if (!B.contains(Kind))
continue;
Attribute Attr;
switch (Kind) {
case Attribute::ByVal:
Attr = Attribute::getWithByValType(C, B.getByValType());
break;
case Attribute::StructRet:
Attr = Attribute::getWithStructRetType(C, B.getStructRetType());
break;
case Attribute::ByRef:
Attr = Attribute::getWithByRefType(C, B.getByRefType());
break;
case Attribute::Preallocated:
Attr = Attribute::getWithPreallocatedType(C, B.getPreallocatedType());
break;
case Attribute::Alignment:
assert(B.getAlignment() && "Alignment must be set");
Attr = Attribute::getWithAlignment(C, *B.getAlignment());
break;
case Attribute::StackAlignment:
assert(B.getStackAlignment() && "StackAlignment must be set");
Attr = Attribute::getWithStackAlignment(C, *B.getStackAlignment());
break;
case Attribute::Dereferenceable:
Attr = Attribute::getWithDereferenceableBytes(
C, B.getDereferenceableBytes());
break;
case Attribute::DereferenceableOrNull:
Attr = Attribute::getWithDereferenceableOrNullBytes(
C, B.getDereferenceableOrNullBytes());
break;
case Attribute::AllocSize: {
auto A = B.getAllocSizeArgs();
Attr = Attribute::getWithAllocSizeArgs(C, A.first, A.second);
break;
}
default:
Attr = Attribute::get(C, Kind);
}
Attrs.push_back(Attr);
}
// Add target-dependent (string) attributes.
for (const auto &TDA : B.td_attrs())
Attrs.emplace_back(Attribute::get(C, TDA.first, TDA.second));
return getSorted(C, Attrs);
}
bool AttributeSetNode::hasAttribute(StringRef Kind) const {
return StringAttrs.count(Kind);
}
Optional<Attribute>
AttributeSetNode::findEnumAttribute(Attribute::AttrKind Kind) const {
// Do a quick presence check.
if (!hasAttribute(Kind))
return None;
// Attributes in a set are sorted by enum value, followed by string
// attributes. Binary search the one we want.
const Attribute *I =
std::lower_bound(begin(), end() - StringAttrs.size(), Kind,
[](Attribute A, Attribute::AttrKind Kind) {
return A.getKindAsEnum() < Kind;
});
assert(I != end() && I->hasAttribute(Kind) && "Presence check failed?");
return *I;
}
Attribute AttributeSetNode::getAttribute(Attribute::AttrKind Kind) const {
if (auto A = findEnumAttribute(Kind))
return *A;
return {};
}
Attribute AttributeSetNode::getAttribute(StringRef Kind) const {
return StringAttrs.lookup(Kind);
}
MaybeAlign AttributeSetNode::getAlignment() const {
if (auto A = findEnumAttribute(Attribute::Alignment))
return A->getAlignment();
return None;
}
MaybeAlign AttributeSetNode::getStackAlignment() const {
if (auto A = findEnumAttribute(Attribute::StackAlignment))
return A->getStackAlignment();
return None;
}
Type *AttributeSetNode::getByValType() const {
if (auto A = findEnumAttribute(Attribute::ByVal))
return A->getValueAsType();
return nullptr;
}
Type *AttributeSetNode::getStructRetType() const {
if (auto A = findEnumAttribute(Attribute::StructRet))
return A->getValueAsType();
return nullptr;
}
Type *AttributeSetNode::getByRefType() const {
if (auto A = findEnumAttribute(Attribute::ByRef))
return A->getValueAsType();
return nullptr;
}
Type *AttributeSetNode::getPreallocatedType() const {
if (auto A = findEnumAttribute(Attribute::Preallocated))
return A->getValueAsType();
return nullptr;
}
uint64_t AttributeSetNode::getDereferenceableBytes() const {
if (auto A = findEnumAttribute(Attribute::Dereferenceable))
return A->getDereferenceableBytes();
return 0;
}
uint64_t AttributeSetNode::getDereferenceableOrNullBytes() const {
if (auto A = findEnumAttribute(Attribute::DereferenceableOrNull))
return A->getDereferenceableOrNullBytes();
return 0;
}
std::pair<unsigned, Optional<unsigned>>
AttributeSetNode::getAllocSizeArgs() const {
if (auto A = findEnumAttribute(Attribute::AllocSize))
return A->getAllocSizeArgs();
return std::make_pair(0, 0);
}
std::string AttributeSetNode::getAsString(bool InAttrGrp) const {
std::string Str;
for (iterator I = begin(), E = end(); I != E; ++I) {
if (I != begin())
Str += ' ';
Str += I->getAsString(InAttrGrp);
}
return Str;
}
//===----------------------------------------------------------------------===//
// AttributeListImpl Definition
//===----------------------------------------------------------------------===//
/// Map from AttributeList index to the internal array index. Adding one happens
/// to work, because -1 wraps around to 0.
static unsigned attrIdxToArrayIdx(unsigned Index) {
return Index + 1;
}
AttributeListImpl::AttributeListImpl(ArrayRef<AttributeSet> Sets)
: NumAttrSets(Sets.size()) {
assert(!Sets.empty() && "pointless AttributeListImpl");
// There's memory after the node where we can store the entries in.
llvm::copy(Sets, getTrailingObjects<AttributeSet>());
// Initialize AvailableFunctionAttrs and AvailableSomewhereAttrs
// summary bitsets.
for (const auto &I : Sets[attrIdxToArrayIdx(AttributeList::FunctionIndex)])
if (!I.isStringAttribute())
AvailableFunctionAttrs.addAttribute(I.getKindAsEnum());
for (const auto &Set : Sets)
for (const auto &I : Set)
if (!I.isStringAttribute())
AvailableSomewhereAttrs.addAttribute(I.getKindAsEnum());
}
void AttributeListImpl::Profile(FoldingSetNodeID &ID) const {
Profile(ID, makeArrayRef(begin(), end()));
}
void AttributeListImpl::Profile(FoldingSetNodeID &ID,
ArrayRef<AttributeSet> Sets) {
for (const auto &Set : Sets)
ID.AddPointer(Set.SetNode);
}
bool AttributeListImpl::hasAttrSomewhere(Attribute::AttrKind Kind,
unsigned *Index) const {
if (!AvailableSomewhereAttrs.hasAttribute(Kind))
return false;
if (Index) {
for (unsigned I = 0, E = NumAttrSets; I != E; ++I) {
if (begin()[I].hasAttribute(Kind)) {
*Index = I - 1;
break;
}
}
}
return true;
}
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void AttributeListImpl::dump() const {
AttributeList(const_cast<AttributeListImpl *>(this)).dump();
}
#endif
//===----------------------------------------------------------------------===//
// AttributeList Construction and Mutation Methods
//===----------------------------------------------------------------------===//
AttributeList AttributeList::getImpl(LLVMContext &C,
ArrayRef<AttributeSet> AttrSets) {
assert(!AttrSets.empty() && "pointless AttributeListImpl");
LLVMContextImpl *pImpl = C.pImpl;
FoldingSetNodeID ID;
AttributeListImpl::Profile(ID, AttrSets);
void *InsertPoint;
AttributeListImpl *PA =
pImpl->AttrsLists.FindNodeOrInsertPos(ID, InsertPoint);
// If we didn't find any existing attributes of the same shape then
// create a new one and insert it.
if (!PA) {
// Coallocate entries after the AttributeListImpl itself.
void *Mem = pImpl->Alloc.Allocate(
AttributeListImpl::totalSizeToAlloc<AttributeSet>(AttrSets.size()),
alignof(AttributeListImpl));
PA = new (Mem) AttributeListImpl(AttrSets);
pImpl->AttrsLists.InsertNode(PA, InsertPoint);
}
// Return the AttributesList that we found or created.
return AttributeList(PA);
}
AttributeList
AttributeList::get(LLVMContext &C,
ArrayRef<std::pair<unsigned, Attribute>> Attrs) {
// If there are no attributes then return a null AttributesList pointer.
if (Attrs.empty())
return {};
assert(llvm::is_sorted(Attrs,
[](const std::pair<unsigned, Attribute> &LHS,
const std::pair<unsigned, Attribute> &RHS) {
return LHS.first < RHS.first;
}) &&
"Misordered Attributes list!");
assert(llvm::all_of(Attrs,
[](const std::pair<unsigned, Attribute> &Pair) {
return Pair.second.isValid();
}) &&
"Pointless attribute!");
// Create a vector if (unsigned, AttributeSetNode*) pairs from the attributes
// list.
SmallVector<std::pair<unsigned, AttributeSet>, 8> AttrPairVec;
for (ArrayRef<std::pair<unsigned, Attribute>>::iterator I = Attrs.begin(),
E = Attrs.end(); I != E; ) {
unsigned Index = I->first;
SmallVector<Attribute, 4> AttrVec;
while (I != E && I->first == Index) {
AttrVec.push_back(I->second);
++I;
}
AttrPairVec.emplace_back(Index, AttributeSet::get(C, AttrVec));
}
return get(C, AttrPairVec);
}
AttributeList
AttributeList::get(LLVMContext &C,
ArrayRef<std::pair<unsigned, AttributeSet>> Attrs) {
// If there are no attributes then return a null AttributesList pointer.
if (Attrs.empty())
return {};
assert(llvm::is_sorted(Attrs,
[](const std::pair<unsigned, AttributeSet> &LHS,
const std::pair<unsigned, AttributeSet> &RHS) {
return LHS.first < RHS.first;
}) &&
"Misordered Attributes list!");
assert(llvm::none_of(Attrs,
[](const std::pair<unsigned, AttributeSet> &Pair) {
return !Pair.second.hasAttributes();
}) &&
"Pointless attribute!");
unsigned MaxIndex = Attrs.back().first;
// If the MaxIndex is FunctionIndex and there are other indices in front
// of it, we need to use the largest of those to get the right size.
if (MaxIndex == FunctionIndex && Attrs.size() > 1)
MaxIndex = Attrs[Attrs.size() - 2].first;
SmallVector<AttributeSet, 4> AttrVec(attrIdxToArrayIdx(MaxIndex) + 1);
for (const auto &Pair : Attrs)
AttrVec[attrIdxToArrayIdx(Pair.first)] = Pair.second;
return getImpl(C, AttrVec);
}
AttributeList AttributeList::get(LLVMContext &C, AttributeSet FnAttrs,
AttributeSet RetAttrs,
ArrayRef<AttributeSet> ArgAttrs) {
// Scan from the end to find the last argument with attributes. Most
// arguments don't have attributes, so it's nice if we can have fewer unique
// AttributeListImpls by dropping empty attribute sets at the end of the list.
unsigned NumSets = 0;
for (size_t I = ArgAttrs.size(); I != 0; --I) {
if (ArgAttrs[I - 1].hasAttributes()) {
NumSets = I + 2;
break;
}
}
if (NumSets == 0) {
// Check function and return attributes if we didn't have argument
// attributes.
if (RetAttrs.hasAttributes())
NumSets = 2;
else if (FnAttrs.hasAttributes())
NumSets = 1;
}
// If all attribute sets were empty, we can use the empty attribute list.
if (NumSets == 0)
return {};
SmallVector<AttributeSet, 8> AttrSets;
AttrSets.reserve(NumSets);
// If we have any attributes, we always have function attributes.
AttrSets.push_back(FnAttrs);
if (NumSets > 1)
AttrSets.push_back(RetAttrs);
if (NumSets > 2) {
// Drop the empty argument attribute sets at the end.
ArgAttrs = ArgAttrs.take_front(NumSets - 2);
AttrSets.insert(AttrSets.end(), ArgAttrs.begin(), ArgAttrs.end());
}
return getImpl(C, AttrSets);
}
AttributeList AttributeList::get(LLVMContext &C, unsigned Index,
const AttrBuilder &B) {
if (!B.hasAttributes())
return {};
Index = attrIdxToArrayIdx(Index);
SmallVector<AttributeSet, 8> AttrSets(Index + 1);
AttrSets[Index] = AttributeSet::get(C, B);
return getImpl(C, AttrSets);
}
AttributeList AttributeList::get(LLVMContext &C, unsigned Index,
ArrayRef<Attribute::AttrKind> Kinds) {
SmallVector<std::pair<unsigned, Attribute>, 8> Attrs;
for (const auto K : Kinds)
Attrs.emplace_back(Index, Attribute::get(C, K));
return get(C, Attrs);
}
AttributeList AttributeList::get(LLVMContext &C, unsigned Index,
ArrayRef<Attribute::AttrKind> Kinds,
ArrayRef<uint64_t> Values) {
assert(Kinds.size() == Values.size() && "Mismatched attribute values.");
SmallVector<std::pair<unsigned, Attribute>, 8> Attrs;
auto VI = Values.begin();
for (const auto K : Kinds)
Attrs.emplace_back(Index, Attribute::get(C, K, *VI++));
return get(C, Attrs);
}
AttributeList AttributeList::get(LLVMContext &C, unsigned Index,
ArrayRef<StringRef> Kinds) {
SmallVector<std::pair<unsigned, Attribute>, 8> Attrs;
for (const auto &K : Kinds)
Attrs.emplace_back(Index, Attribute::get(C, K));
return get(C, Attrs);
}
AttributeList AttributeList::get(LLVMContext &C,
ArrayRef<AttributeList> Attrs) {
if (Attrs.empty())
return {};
if (Attrs.size() == 1)
return Attrs[0];
unsigned MaxSize = 0;
for (const auto &List : Attrs)
MaxSize = std::max(MaxSize, List.getNumAttrSets());
// If every list was empty, there is no point in merging the lists.
if (MaxSize == 0)
return {};
SmallVector<AttributeSet, 8> NewAttrSets(MaxSize);
for (unsigned I = 0; I < MaxSize; ++I) {
AttrBuilder CurBuilder;
for (const auto &List : Attrs)
CurBuilder.merge(List.getAttributes(I - 1));
NewAttrSets[I] = AttributeSet::get(C, CurBuilder);
}
return getImpl(C, NewAttrSets);
}
AttributeList AttributeList::addAttribute(LLVMContext &C, unsigned Index,
Attribute::AttrKind Kind) const {
if (hasAttribute(Index, Kind)) return *this;
AttrBuilder B;
B.addAttribute(Kind);
return addAttributes(C, Index, B);
}
AttributeList AttributeList::addAttribute(LLVMContext &C, unsigned Index,
StringRef Kind,
StringRef Value) const {
AttrBuilder B;
B.addAttribute(Kind, Value);
return addAttributes(C, Index, B);
}
AttributeList AttributeList::addAttribute(LLVMContext &C, unsigned Index,
Attribute A) const {
AttrBuilder B;
B.addAttribute(A);
return addAttributes(C, Index, B);
}
AttributeList AttributeList::addAttributes(LLVMContext &C, unsigned Index,
const AttrBuilder &B) const {
if (!B.hasAttributes())
return *this;
if (!pImpl)
return AttributeList::get(C, {{Index, AttributeSet::get(C, B)}});
#ifndef NDEBUG
// FIXME it is not obvious how this should work for alignment. For now, say
// we can't change a known alignment.
const MaybeAlign OldAlign = getAttributes(Index).getAlignment();
const MaybeAlign NewAlign = B.getAlignment();
assert((!OldAlign || !NewAlign || OldAlign == NewAlign) &&
"Attempt to change alignment!");
#endif
Index = attrIdxToArrayIdx(Index);
SmallVector<AttributeSet, 4> AttrSets(this->begin(), this->end());
if (Index >= AttrSets.size())
AttrSets.resize(Index + 1);
AttrBuilder Merged(AttrSets[Index]);
Merged.merge(B);
AttrSets[Index] = AttributeSet::get(C, Merged);
return getImpl(C, AttrSets);
}
AttributeList AttributeList::addParamAttribute(LLVMContext &C,
ArrayRef<unsigned> ArgNos,
Attribute A) const {
assert(llvm::is_sorted(ArgNos));
SmallVector<AttributeSet, 4> AttrSets(this->begin(), this->end());
unsigned MaxIndex = attrIdxToArrayIdx(ArgNos.back() + FirstArgIndex);
if (MaxIndex >= AttrSets.size())
AttrSets.resize(MaxIndex + 1);
for (unsigned ArgNo : ArgNos) {
unsigned Index = attrIdxToArrayIdx(ArgNo + FirstArgIndex);
AttrBuilder B(AttrSets[Index]);
B.addAttribute(A);
AttrSets[Index] = AttributeSet::get(C, B);
}
return getImpl(C, AttrSets);
}
AttributeList AttributeList::removeAttribute(LLVMContext &C, unsigned Index,
Attribute::AttrKind Kind) const {
if (!hasAttribute(Index, Kind)) return *this;
Index = attrIdxToArrayIdx(Index);
SmallVector<AttributeSet, 4> AttrSets(this->begin(), this->end());
assert(Index < AttrSets.size());
AttrSets[Index] = AttrSets[Index].removeAttribute(C, Kind);
return getImpl(C, AttrSets);
}
AttributeList AttributeList::removeAttribute(LLVMContext &C, unsigned Index,
StringRef Kind) const {
if (!hasAttribute(Index, Kind)) return *this;
Index = attrIdxToArrayIdx(Index);
SmallVector<AttributeSet, 4> AttrSets(this->begin(), this->end());
assert(Index < AttrSets.size());
AttrSets[Index] = AttrSets[Index].removeAttribute(C, Kind);
return getImpl(C, AttrSets);
}
AttributeList
AttributeList::removeAttributes(LLVMContext &C, unsigned Index,
const AttrBuilder &AttrsToRemove) const {
if (!pImpl)
return {};
Index = attrIdxToArrayIdx(Index);
SmallVector<AttributeSet, 4> AttrSets(this->begin(), this->end());
if (Index >= AttrSets.size())
AttrSets.resize(Index + 1);
AttrSets[Index] = AttrSets[Index].removeAttributes(C, AttrsToRemove);
return getImpl(C, AttrSets);
}
AttributeList AttributeList::removeAttributes(LLVMContext &C,
unsigned WithoutIndex) const {
if (!pImpl)
return {};
WithoutIndex = attrIdxToArrayIdx(WithoutIndex);
if (WithoutIndex >= getNumAttrSets())
return *this;
SmallVector<AttributeSet, 4> AttrSets(this->begin(), this->end());
AttrSets[WithoutIndex] = AttributeSet();
return getImpl(C, AttrSets);
}
AttributeList AttributeList::addDereferenceableAttr(LLVMContext &C,
unsigned Index,
uint64_t Bytes) const {
AttrBuilder B;
B.addDereferenceableAttr(Bytes);
return addAttributes(C, Index, B);
}
AttributeList
AttributeList::addDereferenceableOrNullAttr(LLVMContext &C, unsigned Index,
uint64_t Bytes) const {
AttrBuilder B;
B.addDereferenceableOrNullAttr(Bytes);
return addAttributes(C, Index, B);
}
AttributeList
AttributeList::addAllocSizeAttr(LLVMContext &C, unsigned Index,
unsigned ElemSizeArg,
const Optional<unsigned> &NumElemsArg) {
AttrBuilder B;
B.addAllocSizeAttr(ElemSizeArg, NumElemsArg);
return addAttributes(C, Index, B);
}
//===----------------------------------------------------------------------===//
// AttributeList Accessor Methods
//===----------------------------------------------------------------------===//
AttributeSet AttributeList::getParamAttributes(unsigned ArgNo) const {
return getAttributes(ArgNo + FirstArgIndex);
}
AttributeSet AttributeList::getRetAttributes() const {
return getAttributes(ReturnIndex);
}
AttributeSet AttributeList::getFnAttributes() const {
return getAttributes(FunctionIndex);
}
bool AttributeList::hasAttribute(unsigned Index,
Attribute::AttrKind Kind) const {
return getAttributes(Index).hasAttribute(Kind);
}
bool AttributeList::hasAttribute(unsigned Index, StringRef Kind) const {
return getAttributes(Index).hasAttribute(Kind);
}
bool AttributeList::hasAttributes(unsigned Index) const {
return getAttributes(Index).hasAttributes();
}
bool AttributeList::hasFnAttribute(Attribute::AttrKind Kind) const {
return pImpl && pImpl->hasFnAttribute(Kind);
}
bool AttributeList::hasFnAttribute(StringRef Kind) const {
return hasAttribute(AttributeList::FunctionIndex, Kind);
}
bool AttributeList::hasParamAttribute(unsigned ArgNo,
Attribute::AttrKind Kind) const {
return hasAttribute(ArgNo + FirstArgIndex, Kind);
}
bool AttributeList::hasAttrSomewhere(Attribute::AttrKind Attr,
unsigned *Index) const {
return pImpl && pImpl->hasAttrSomewhere(Attr, Index);
}
Attribute AttributeList::getAttribute(unsigned Index,
Attribute::AttrKind Kind) const {
return getAttributes(Index).getAttribute(Kind);
}
Attribute AttributeList::getAttribute(unsigned Index, StringRef Kind) const {
return getAttributes(Index).getAttribute(Kind);
}
MaybeAlign AttributeList::getRetAlignment() const {
return getAttributes(ReturnIndex).getAlignment();
}
MaybeAlign AttributeList::getParamAlignment(unsigned ArgNo) const {
return getAttributes(ArgNo + FirstArgIndex).getAlignment();
}
Type *AttributeList::getParamByValType(unsigned Index) const {
return getAttributes(Index+FirstArgIndex).getByValType();
}
Type *AttributeList::getParamStructRetType(unsigned Index) const {
return getAttributes(Index + FirstArgIndex).getStructRetType();
}
Type *AttributeList::getParamByRefType(unsigned Index) const {
return getAttributes(Index + FirstArgIndex).getByRefType();
}
Type *AttributeList::getParamPreallocatedType(unsigned Index) const {
return getAttributes(Index + FirstArgIndex).getPreallocatedType();
}
MaybeAlign AttributeList::getStackAlignment(unsigned Index) const {
return getAttributes(Index).getStackAlignment();
}
uint64_t AttributeList::getDereferenceableBytes(unsigned Index) const {
return getAttributes(Index).getDereferenceableBytes();
}
uint64_t AttributeList::getDereferenceableOrNullBytes(unsigned Index) const {
return getAttributes(Index).getDereferenceableOrNullBytes();
}
std::pair<unsigned, Optional<unsigned>>
AttributeList::getAllocSizeArgs(unsigned Index) const {
return getAttributes(Index).getAllocSizeArgs();
}
std::string AttributeList::getAsString(unsigned Index, bool InAttrGrp) const {
return getAttributes(Index).getAsString(InAttrGrp);
}
AttributeSet AttributeList::getAttributes(unsigned Index) const {
Index = attrIdxToArrayIdx(Index);
if (!pImpl || Index >= getNumAttrSets())
return {};
return pImpl->begin()[Index];
}
AttributeList::iterator AttributeList::begin() const {
return pImpl ? pImpl->begin() : nullptr;
}
AttributeList::iterator AttributeList::end() const {
return pImpl ? pImpl->end() : nullptr;
}
//===----------------------------------------------------------------------===//
// AttributeList Introspection Methods
//===----------------------------------------------------------------------===//
unsigned AttributeList::getNumAttrSets() const {
return pImpl ? pImpl->NumAttrSets : 0;
}
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void AttributeList::dump() const {
dbgs() << "PAL[\n";
for (unsigned i = index_begin(), e = index_end(); i != e; ++i) {
if (getAttributes(i).hasAttributes())
dbgs() << " { " << i << " => " << getAsString(i) << " }\n";
}
dbgs() << "]\n";
}
#endif
//===----------------------------------------------------------------------===//
// AttrBuilder Method Implementations
//===----------------------------------------------------------------------===//
// FIXME: Remove this ctor, use AttributeSet.
AttrBuilder::AttrBuilder(AttributeList AL, unsigned Index) {
AttributeSet AS = AL.getAttributes(Index);
for (const auto &A : AS)
addAttribute(A);
}
AttrBuilder::AttrBuilder(AttributeSet AS) {
for (const auto &A : AS)
addAttribute(A);
}
void AttrBuilder::clear() {
Attrs.reset();
TargetDepAttrs.clear();
Alignment.reset();
StackAlignment.reset();
DerefBytes = DerefOrNullBytes = 0;
AllocSizeArgs = 0;
ByValType = nullptr;
StructRetType = nullptr;
ByRefType = nullptr;
PreallocatedType = nullptr;
}
AttrBuilder &AttrBuilder::addAttribute(Attribute Attr) {
if (Attr.isStringAttribute()) {
addAttribute(Attr.getKindAsString(), Attr.getValueAsString());
return *this;
}
Attribute::AttrKind Kind = Attr.getKindAsEnum();
Attrs[Kind] = true;
if (Kind == Attribute::Alignment)
Alignment = Attr.getAlignment();
else if (Kind == Attribute::StackAlignment)
StackAlignment = Attr.getStackAlignment();
else if (Kind == Attribute::ByVal)
ByValType = Attr.getValueAsType();
else if (Kind == Attribute::StructRet)
StructRetType = Attr.getValueAsType();
else if (Kind == Attribute::ByRef)
ByRefType = Attr.getValueAsType();
else if (Kind == Attribute::Preallocated)
PreallocatedType = Attr.getValueAsType();
else if (Kind == Attribute::Dereferenceable)
DerefBytes = Attr.getDereferenceableBytes();
else if (Kind == Attribute::DereferenceableOrNull)
DerefOrNullBytes = Attr.getDereferenceableOrNullBytes();
else if (Kind == Attribute::AllocSize)
AllocSizeArgs = Attr.getValueAsInt();
return *this;
}
AttrBuilder &AttrBuilder::addAttribute(StringRef A, StringRef V) {
TargetDepAttrs[std::string(A)] = std::string(V);
return *this;
}
AttrBuilder &AttrBuilder::removeAttribute(Attribute::AttrKind Val) {
assert((unsigned)Val < Attribute::EndAttrKinds && "Attribute out of range!");
Attrs[Val] = false;
if (Val == Attribute::Alignment)
Alignment.reset();
else if (Val == Attribute::StackAlignment)
StackAlignment.reset();
else if (Val == Attribute::ByVal)
ByValType = nullptr;
else if (Val == Attribute::StructRet)
StructRetType = nullptr;
else if (Val == Attribute::ByRef)
ByRefType = nullptr;
else if (Val == Attribute::Preallocated)
PreallocatedType = nullptr;
else if (Val == Attribute::Dereferenceable)
DerefBytes = 0;
else if (Val == Attribute::DereferenceableOrNull)
DerefOrNullBytes = 0;
else if (Val == Attribute::AllocSize)
AllocSizeArgs = 0;
return *this;
}
AttrBuilder &AttrBuilder::removeAttributes(AttributeList A, uint64_t Index) {
remove(A.getAttributes(Index));
return *this;
}
AttrBuilder &AttrBuilder::removeAttribute(StringRef A) {
auto I = TargetDepAttrs.find(A);
if (I != TargetDepAttrs.end())
TargetDepAttrs.erase(I);
return *this;
}
std::pair<unsigned, Optional<unsigned>> AttrBuilder::getAllocSizeArgs() const {
return unpackAllocSizeArgs(AllocSizeArgs);
}
AttrBuilder &AttrBuilder::addAlignmentAttr(MaybeAlign Align) {
if (!Align)
return *this;
assert(*Align <= llvm::Value::MaximumAlignment && "Alignment too large.");
Attrs[Attribute::Alignment] = true;
Alignment = Align;
return *this;
}
AttrBuilder &AttrBuilder::addStackAlignmentAttr(MaybeAlign Align) {
// Default alignment, allow the target to define how to align it.
if (!Align)
return *this;
assert(*Align <= 0x100 && "Alignment too large.");
Attrs[Attribute::StackAlignment] = true;
StackAlignment = Align;
return *this;
}
AttrBuilder &AttrBuilder::addDereferenceableAttr(uint64_t Bytes) {
if (Bytes == 0) return *this;
Attrs[Attribute::Dereferenceable] = true;
DerefBytes = Bytes;
return *this;
}
AttrBuilder &AttrBuilder::addDereferenceableOrNullAttr(uint64_t Bytes) {
if (Bytes == 0)
return *this;
Attrs[Attribute::DereferenceableOrNull] = true;
DerefOrNullBytes = Bytes;
return *this;
}
AttrBuilder &AttrBuilder::addAllocSizeAttr(unsigned ElemSize,
const Optional<unsigned> &NumElems) {
return addAllocSizeAttrFromRawRepr(packAllocSizeArgs(ElemSize, NumElems));
}
AttrBuilder &AttrBuilder::addAllocSizeAttrFromRawRepr(uint64_t RawArgs) {
// (0, 0) is our "not present" value, so we need to check for it here.
assert(RawArgs && "Invalid allocsize arguments -- given allocsize(0, 0)");
Attrs[Attribute::AllocSize] = true;
// Reuse existing machinery to store this as a single 64-bit integer so we can
// save a few bytes over using a pair<unsigned, Optional<unsigned>>.
AllocSizeArgs = RawArgs;
return *this;
}
AttrBuilder &AttrBuilder::addByValAttr(Type *Ty) {
Attrs[Attribute::ByVal] = true;
ByValType = Ty;
return *this;
}
AttrBuilder &AttrBuilder::addStructRetAttr(Type *Ty) {
Attrs[Attribute::StructRet] = true;
StructRetType = Ty;
return *this;
}
AttrBuilder &AttrBuilder::addByRefAttr(Type *Ty) {
Attrs[Attribute::ByRef] = true;
ByRefType = Ty;
return *this;
}
AttrBuilder &AttrBuilder::addPreallocatedAttr(Type *Ty) {
Attrs[Attribute::Preallocated] = true;
PreallocatedType = Ty;
return *this;
}
AttrBuilder &AttrBuilder::merge(const AttrBuilder &B) {
// FIXME: What if both have alignments, but they don't match?!
if (!Alignment)
Alignment = B.Alignment;
if (!StackAlignment)
StackAlignment = B.StackAlignment;
if (!DerefBytes)
DerefBytes = B.DerefBytes;
if (!DerefOrNullBytes)
DerefOrNullBytes = B.DerefOrNullBytes;
if (!AllocSizeArgs)
AllocSizeArgs = B.AllocSizeArgs;
if (!ByValType)
ByValType = B.ByValType;
if (!StructRetType)
StructRetType = B.StructRetType;
if (!ByRefType)
ByRefType = B.ByRefType;
if (!PreallocatedType)
PreallocatedType = B.PreallocatedType;
Attrs |= B.Attrs;
for (const auto &I : B.td_attrs())
TargetDepAttrs[I.first] = I.second;
return *this;
}
AttrBuilder &AttrBuilder::remove(const AttrBuilder &B) {
// FIXME: What if both have alignments, but they don't match?!
if (B.Alignment)
Alignment.reset();
if (B.StackAlignment)
StackAlignment.reset();
if (B.DerefBytes)
DerefBytes = 0;
if (B.DerefOrNullBytes)
DerefOrNullBytes = 0;
if (B.AllocSizeArgs)
AllocSizeArgs = 0;
if (B.ByValType)
ByValType = nullptr;
if (B.StructRetType)
StructRetType = nullptr;
if (B.ByRefType)
ByRefType = nullptr;
if (B.PreallocatedType)
PreallocatedType = nullptr;
Attrs &= ~B.Attrs;
for (const auto &I : B.td_attrs())
TargetDepAttrs.erase(I.first);
return *this;
}
bool AttrBuilder::overlaps(const AttrBuilder &B) const {
// First check if any of the target independent attributes overlap.
if ((Attrs & B.Attrs).any())
return true;
// Then check if any target dependent ones do.
for (const auto &I : td_attrs())
if (B.contains(I.first))
return true;
return false;
}
bool AttrBuilder::contains(StringRef A) const {
return TargetDepAttrs.find(A) != TargetDepAttrs.end();
}
bool AttrBuilder::hasAttributes() const {
return !Attrs.none() || !TargetDepAttrs.empty();
}
bool AttrBuilder::hasAttributes(AttributeList AL, uint64_t Index) const {
AttributeSet AS = AL.getAttributes(Index);
for (const auto &Attr : AS) {
if (Attr.isEnumAttribute() || Attr.isIntAttribute()) {
if (contains(Attr.getKindAsEnum()))
return true;
} else {
assert(Attr.isStringAttribute() && "Invalid attribute kind!");
return contains(Attr.getKindAsString());
}
}
return false;
}
bool AttrBuilder::hasAlignmentAttr() const {
return Alignment != 0;
}
bool AttrBuilder::operator==(const AttrBuilder &B) {
if (Attrs != B.Attrs)
return false;
for (td_const_iterator I = TargetDepAttrs.begin(),
E = TargetDepAttrs.end(); I != E; ++I)
if (B.TargetDepAttrs.find(I->first) == B.TargetDepAttrs.end())
return false;
return Alignment == B.Alignment && StackAlignment == B.StackAlignment &&
DerefBytes == B.DerefBytes && ByValType == B.ByValType &&
StructRetType == B.StructRetType && ByRefType == B.ByRefType &&
PreallocatedType == B.PreallocatedType;
}
//===----------------------------------------------------------------------===//
// AttributeFuncs Function Defintions
//===----------------------------------------------------------------------===//
/// Which attributes cannot be applied to a type.
AttrBuilder AttributeFuncs::typeIncompatible(Type *Ty) {
AttrBuilder Incompatible;
if (!Ty->isIntegerTy())
// Attribute that only apply to integers.
Incompatible.addAttribute(Attribute::SExt)
.addAttribute(Attribute::ZExt);
if (!Ty->isPointerTy())
// Attribute that only apply to pointers.
Incompatible.addAttribute(Attribute::Nest)
.addAttribute(Attribute::NoAlias)
.addAttribute(Attribute::NoCapture)
.addAttribute(Attribute::NonNull)
.addAlignmentAttr(1) // the int here is ignored
.addDereferenceableAttr(1) // the int here is ignored
.addDereferenceableOrNullAttr(1) // the int here is ignored
.addAttribute(Attribute::ReadNone)
.addAttribute(Attribute::ReadOnly)
.addAttribute(Attribute::InAlloca)
.addPreallocatedAttr(Ty)
.addByValAttr(Ty)
.addStructRetAttr(Ty)
.addByRefAttr(Ty);
// Some attributes can apply to all "values" but there are no `void` values.
if (Ty->isVoidTy())
Incompatible.addAttribute(Attribute::NoUndef);
return Incompatible;
}
template<typename AttrClass>
static bool isEqual(const Function &Caller, const Function &Callee) {
return Caller.getFnAttribute(AttrClass::getKind()) ==
Callee.getFnAttribute(AttrClass::getKind());
}
/// Compute the logical AND of the attributes of the caller and the
/// callee.
///
/// This function sets the caller's attribute to false if the callee's attribute
/// is false.
template<typename AttrClass>
static void setAND(Function &Caller, const Function &Callee) {
if (AttrClass::isSet(Caller, AttrClass::getKind()) &&
!AttrClass::isSet(Callee, AttrClass::getKind()))
AttrClass::set(Caller, AttrClass::getKind(), false);
}
/// Compute the logical OR of the attributes of the caller and the
/// callee.
///
/// This function sets the caller's attribute to true if the callee's attribute
/// is true.
template<typename AttrClass>
static void setOR(Function &Caller, const Function &Callee) {
if (!AttrClass::isSet(Caller, AttrClass::getKind()) &&
AttrClass::isSet(Callee, AttrClass::getKind()))
AttrClass::set(Caller, AttrClass::getKind(), true);
}
/// If the inlined function had a higher stack protection level than the
/// calling function, then bump up the caller's stack protection level.
static void adjustCallerSSPLevel(Function &Caller, const Function &Callee) {
assert(!(Callee.hasFnAttribute(Attribute::NoStackProtect) &&
(Caller.hasFnAttribute(Attribute::StackProtect) ||
Caller.hasFnAttribute(Attribute::StackProtectStrong) ||
Caller.hasFnAttribute(Attribute::StackProtectReq))) &&
"stack protected caller but callee requested no stack protector");
assert(!(Caller.hasFnAttribute(Attribute::NoStackProtect) &&
(Callee.hasFnAttribute(Attribute::StackProtect) ||
Callee.hasFnAttribute(Attribute::StackProtectStrong) ||
Callee.hasFnAttribute(Attribute::StackProtectReq))) &&
"stack protected callee but caller requested no stack protector");
// If upgrading the SSP attribute, clear out the old SSP Attributes first.
AttrBuilder OldSSPAttr;
OldSSPAttr.addAttribute(Attribute::StackProtect)
.addAttribute(Attribute::StackProtectStrong)
.addAttribute(Attribute::StackProtectReq);
if (Callee.hasFnAttribute(Attribute::StackProtectReq)) {
Caller.removeAttributes(AttributeList::FunctionIndex, OldSSPAttr);
Caller.addFnAttr(Attribute::StackProtectReq);
} else if (Callee.hasFnAttribute(Attribute::StackProtectStrong) &&
!Caller.hasFnAttribute(Attribute::StackProtectReq)) {
Caller.removeAttributes(AttributeList::FunctionIndex, OldSSPAttr);
Caller.addFnAttr(Attribute::StackProtectStrong);
} else if (Callee.hasFnAttribute(Attribute::StackProtect) &&
!Caller.hasFnAttribute(Attribute::StackProtectReq) &&
!Caller.hasFnAttribute(Attribute::StackProtectStrong))
Caller.addFnAttr(Attribute::StackProtect);
}
/// If the inlined function required stack probes, then ensure that
/// the calling function has those too.
static void adjustCallerStackProbes(Function &Caller, const Function &Callee) {
if (!Caller.hasFnAttribute("probe-stack") &&
Callee.hasFnAttribute("probe-stack")) {
Caller.addFnAttr(Callee.getFnAttribute("probe-stack"));
}
}
/// If the inlined function defines the size of guard region
/// on the stack, then ensure that the calling function defines a guard region
/// that is no larger.
static void
adjustCallerStackProbeSize(Function &Caller, const Function &Callee) {
Attribute CalleeAttr = Callee.getFnAttribute("stack-probe-size");
if (CalleeAttr.isValid()) {
Attribute CallerAttr = Caller.getFnAttribute("stack-probe-size");
if (CallerAttr.isValid()) {
uint64_t CallerStackProbeSize, CalleeStackProbeSize;
CallerAttr.getValueAsString().getAsInteger(0, CallerStackProbeSize);
CalleeAttr.getValueAsString().getAsInteger(0, CalleeStackProbeSize);
if (CallerStackProbeSize > CalleeStackProbeSize) {
Caller.addFnAttr(CalleeAttr);
}
} else {
Caller.addFnAttr(CalleeAttr);
}
}
}
/// If the inlined function defines a min legal vector width, then ensure
/// the calling function has the same or larger min legal vector width. If the
/// caller has the attribute, but the callee doesn't, we need to remove the
/// attribute from the caller since we can't make any guarantees about the
/// caller's requirements.
/// This function is called after the inlining decision has been made so we have
/// to merge the attribute this way. Heuristics that would use
/// min-legal-vector-width to determine inline compatibility would need to be
/// handled as part of inline cost analysis.
static void
adjustMinLegalVectorWidth(Function &Caller, const Function &Callee) {
Attribute CallerAttr = Caller.getFnAttribute("min-legal-vector-width");
if (CallerAttr.isValid()) {
Attribute CalleeAttr = Callee.getFnAttribute("min-legal-vector-width");
if (CalleeAttr.isValid()) {
uint64_t CallerVectorWidth, CalleeVectorWidth;
CallerAttr.getValueAsString().getAsInteger(0, CallerVectorWidth);
CalleeAttr.getValueAsString().getAsInteger(0, CalleeVectorWidth);
if (CallerVectorWidth < CalleeVectorWidth)
Caller.addFnAttr(CalleeAttr);
} else {
// If the callee doesn't have the attribute then we don't know anything
// and must drop the attribute from the caller.
Caller.removeFnAttr("min-legal-vector-width");
}
}
}
/// If the inlined function has null_pointer_is_valid attribute,
/// set this attribute in the caller post inlining.
static void
adjustNullPointerValidAttr(Function &Caller, const Function &Callee) {
if (Callee.nullPointerIsDefined() && !Caller.nullPointerIsDefined()) {
Caller.addFnAttr(Attribute::NullPointerIsValid);
}
}
struct EnumAttr {
static bool isSet(const Function &Fn,
Attribute::AttrKind Kind) {
return Fn.hasFnAttribute(Kind);
}
static void set(Function &Fn,
Attribute::AttrKind Kind, bool Val) {
if (Val)
Fn.addFnAttr(Kind);
else
Fn.removeFnAttr(Kind);
}
};
struct StrBoolAttr {
static bool isSet(const Function &Fn,
StringRef Kind) {
auto A = Fn.getFnAttribute(Kind);
return A.getValueAsString().equals("true");
}
static void set(Function &Fn,
StringRef Kind, bool Val) {
Fn.addFnAttr(Kind, Val ? "true" : "false");
}
};
#define GET_ATTR_NAMES
#define ATTRIBUTE_ENUM(ENUM_NAME, DISPLAY_NAME) \
struct ENUM_NAME##Attr : EnumAttr { \
static enum Attribute::AttrKind getKind() { \
return llvm::Attribute::ENUM_NAME; \
} \
};
#define ATTRIBUTE_STRBOOL(ENUM_NAME, DISPLAY_NAME) \
struct ENUM_NAME##Attr : StrBoolAttr { \
static StringRef getKind() { return #DISPLAY_NAME; } \
};
#include "llvm/IR/Attributes.inc"
#define GET_ATTR_COMPAT_FUNC
#include "llvm/IR/Attributes.inc"
bool AttributeFuncs::areInlineCompatible(const Function &Caller,
const Function &Callee) {
return hasCompatibleFnAttrs(Caller, Callee);
}
void AttributeFuncs::mergeAttributesForInlining(Function &Caller,
const Function &Callee) {
mergeFnAttrs(Caller, Callee);
}
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