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#include "AliasAnalysisSummary.h"
#include "llvm/IR/Argument.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/Type.h"
#include "llvm/Support/Compiler.h"
namespace llvm {
namespace cflaa {
namespace {
const unsigned AttrEscapedIndex = 0;
const unsigned AttrUnknownIndex = 1;
const unsigned AttrGlobalIndex = 2;
const unsigned AttrCallerIndex = 3;
const unsigned AttrFirstArgIndex = 4;
const unsigned AttrLastArgIndex = NumAliasAttrs;
const unsigned AttrMaxNumArgs = AttrLastArgIndex - AttrFirstArgIndex;
// It would be *slightly* prettier if we changed these to AliasAttrs, but it
// seems that both GCC and MSVC emit dynamic initializers for const bitsets.
using AliasAttr = unsigned;
const AliasAttr AttrNone = 0;
const AliasAttr AttrEscaped = 1 << AttrEscapedIndex;
const AliasAttr AttrUnknown = 1 << AttrUnknownIndex;
const AliasAttr AttrGlobal = 1 << AttrGlobalIndex;
const AliasAttr AttrCaller = 1 << AttrCallerIndex;
const AliasAttr ExternalAttrMask = AttrEscaped | AttrUnknown | AttrGlobal;
}
AliasAttrs getAttrNone() { return AttrNone; }
AliasAttrs getAttrUnknown() { return AttrUnknown; }
bool hasUnknownAttr(AliasAttrs Attr) { return Attr.test(AttrUnknownIndex); }
AliasAttrs getAttrCaller() { return AttrCaller; }
bool hasCallerAttr(AliasAttrs Attr) { return Attr.test(AttrCaller); }
bool hasUnknownOrCallerAttr(AliasAttrs Attr) {
return Attr.test(AttrUnknownIndex) || Attr.test(AttrCallerIndex);
}
AliasAttrs getAttrEscaped() { return AttrEscaped; }
bool hasEscapedAttr(AliasAttrs Attr) { return Attr.test(AttrEscapedIndex); }
static AliasAttr argNumberToAttr(unsigned ArgNum) {
if (ArgNum >= AttrMaxNumArgs)
return AttrUnknown;
// N.B. MSVC complains if we use `1U` here, since AliasAttr' ctor takes
// an unsigned long long.
return AliasAttr(1ULL << (ArgNum + AttrFirstArgIndex));
}
AliasAttrs getGlobalOrArgAttrFromValue(const Value &Val) {
if (isa<GlobalValue>(Val))
return AttrGlobal;
if (auto *Arg = dyn_cast<Argument>(&Val))
// Only pointer arguments should have the argument attribute,
// because things can't escape through scalars without us seeing a
// cast, and thus, interaction with them doesn't matter.
if (!Arg->hasNoAliasAttr() && Arg->getType()->isPointerTy())
return argNumberToAttr(Arg->getArgNo());
return AttrNone;
}
bool isGlobalOrArgAttr(AliasAttrs Attr) {
return Attr.reset(AttrEscapedIndex)
.reset(AttrUnknownIndex)
.reset(AttrCallerIndex)
.any();
}
AliasAttrs getExternallyVisibleAttrs(AliasAttrs Attr) {
return Attr & AliasAttrs(ExternalAttrMask);
}
std::optional<InstantiatedValue>
instantiateInterfaceValue(InterfaceValue IValue, CallBase &Call) {
auto Index = IValue.Index;
auto *V = (Index == 0) ? &Call : Call.getArgOperand(Index - 1);
if (V->getType()->isPointerTy())
return InstantiatedValue{V, IValue.DerefLevel};
return std::nullopt;
}
std::optional<InstantiatedRelation>
instantiateExternalRelation(ExternalRelation ERelation, CallBase &Call) {
auto From = instantiateInterfaceValue(ERelation.From, Call);
if (!From)
return std::nullopt;
auto To = instantiateInterfaceValue(ERelation.To, Call);
if (!To)
return std::nullopt;
return InstantiatedRelation{*From, *To, ERelation.Offset};
}
std::optional<InstantiatedAttr>
instantiateExternalAttribute(ExternalAttribute EAttr, CallBase &Call) {
auto Value = instantiateInterfaceValue(EAttr.IValue, Call);
if (!Value)
return std::nullopt;
return InstantiatedAttr{*Value, EAttr.Attr};
}
}
}
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