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//===--- ConstantBuilder.h - IR generation for constant structs -*- C++ -*-===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// This file implements IR generation of constant packed LLVM structs.
//===----------------------------------------------------------------------===//
#include "swift/ABI/MetadataValues.h"
#include "swift/AST/IRGenOptions.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/Instructions.h"
#include "clang/CodeGen/ConstantInitBuilder.h"
#include "Address.h"
#include "IRGenModule.h"
#include "IRGenFunction.h"
namespace clang {
class PointerAuthSchema;
}
namespace swift {
namespace irgen {
class PointerAuthEntity;
class ConstantAggregateBuilderBase;
class ConstantStructBuilder;
class ConstantArrayBuilder;
class ConstantInitBuilder;
struct ConstantInitBuilderTraits {
using InitBuilder = ConstantInitBuilder;
using AggregateBuilderBase = ConstantAggregateBuilderBase;
using ArrayBuilder = ConstantArrayBuilder;
using StructBuilder = ConstantStructBuilder;
};
/// A Swift customization of Clang's ConstantInitBuilder.
class ConstantInitBuilder
: public clang::CodeGen::ConstantInitBuilderTemplateBase<
ConstantInitBuilderTraits> {
public:
IRGenModule &IGM;
ConstantInitBuilder(IRGenModule &IGM)
: ConstantInitBuilderTemplateBase(IGM.getClangCGM()),
IGM(IGM) {}
};
class ConstantAggregateBuilderBase
: public clang::CodeGen::ConstantAggregateBuilderBase {
using super = clang::CodeGen::ConstantAggregateBuilderBase;
protected:
ConstantAggregateBuilderBase(ConstantInitBuilder &builder,
ConstantAggregateBuilderBase *parent)
: super(builder, parent) {}
ConstantInitBuilder &getBuilder() const {
return static_cast<ConstantInitBuilder&>(Builder);
}
IRGenModule &IGM() const { return getBuilder().IGM; }
public:
void addInt16(uint16_t value) {
addInt(IGM().Int16Ty, value);
}
void addInt32(uint32_t value) {
addInt(IGM().Int32Ty, value);
}
void addInt64(uint64_t value) { addInt(IGM().Int64Ty, value); }
void addSize(Size size) { addInt(IGM().SizeTy, size.getValue()); }
void addCompactFunctionReferenceOrNull(llvm::Function *function) {
if (function) {
addCompactFunctionReference(function);
} else {
addInt(IGM().RelativeAddressTy, 0);
}
}
/// Add a 32-bit function reference to the given function. The reference
/// is direct relative pointer whenever possible. Otherwise, it is a
/// absolute pointer assuming the function address is 32-bit.
void addCompactFunctionReference(llvm::Function *function) {
if (IGM().getOptions().CompactAbsoluteFunctionPointer) {
// Assume that the function address is 32-bit.
add(llvm::ConstantExpr::getPtrToInt(function, IGM().RelativeAddressTy));
} else {
addRelativeOffset(IGM().RelativeAddressTy, function);
}
}
void addRelativeAddressOrNull(llvm::Constant *target) {
if (target) {
addRelativeAddress(target);
} else {
addInt(IGM().RelativeAddressTy, 0);
}
}
void addRelativeAddress(llvm::Constant *target) {
assert(!isa<llvm::ConstantPointerNull>(target));
assert((!IGM().getOptions().CompactAbsoluteFunctionPointer ||
!isa<llvm::Function>(target)) && "use addCompactFunctionReference");
addRelativeOffset(IGM().RelativeAddressTy, target);
}
/// Add a tagged relative reference to the given address. The direct
/// target must be defined within the current image, but it might be
/// a "GOT-equivalent", i.e. a pointer to an external object; if so,
/// set the low bit of the offset to indicate that this is true.
void addRelativeAddress(ConstantReference reference) {
addTaggedRelativeOffset(IGM().RelativeAddressTy,
reference.getValue(),
unsigned(reference.isIndirect()));
}
/// Add an indirect relative reference to the given address.
/// The target must be a "GOT-equivalent", i.e. a pointer to an
/// external object.
void addIndirectRelativeAddress(ConstantReference reference) {
assert(reference.isIndirect());
addRelativeOffset(IGM().RelativeAddressTy,
reference.getValue());
}
Size getNextOffsetFromGlobal() const {
return Size(super::getNextOffsetFromGlobal().getQuantity());
}
void addAlignmentPadding(Alignment align) {
auto misalignment = getNextOffsetFromGlobal() % align;
if (misalignment != Size(0))
add(llvm::ConstantAggregateZero::get(
llvm::ArrayType::get(IGM().Int8Ty,
align.getValue() - misalignment.getValue())));
}
using super::addSignedPointer;
void addSignedPointer(llvm::Constant *pointer,
const clang::PointerAuthSchema &schema,
const PointerAuthEntity &entity);
void addSignedPointer(llvm::Constant *pointer,
const clang::PointerAuthSchema &schema,
uint16_t otherDiscriminator);
/// Add a UniqueHash metadata structure to this builder which stores
/// a hash of the given string.
void addUniqueHash(StringRef ofString);
};
class ConstantArrayBuilder
: public clang::CodeGen::ConstantArrayBuilderTemplateBase<
ConstantInitBuilderTraits> {
private:
llvm::Type *EltTy;
public:
ConstantArrayBuilder(InitBuilder &builder,
AggregateBuilderBase *parent,
llvm::Type *eltTy)
: ConstantArrayBuilderTemplateBase(builder, parent, eltTy), EltTy(eltTy) {}
void addAlignmentPadding(Alignment align) {
auto misalignment = getNextOffsetFromGlobal() % align;
if (misalignment == Size(0))
return;
auto eltSize = IGM().DataLayout.getTypeStoreSize(EltTy);
assert(misalignment.getValue() % eltSize == 0);
for (unsigned i = 0, n = misalignment.getValue() / eltSize; i != n; ++i)
add(llvm::Constant::getNullValue(EltTy));
}
};
class ConstantStructBuilder
: public clang::CodeGen::ConstantStructBuilderTemplateBase<
ConstantInitBuilderTraits> {
public:
template <class... As>
ConstantStructBuilder(As &&... args)
: ConstantStructBuilderTemplateBase(std::forward<As>(args)...) {}
};
} // end namespace irgen
} // end namespace swift
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