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//===- DIEGenerator.h -------------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_DWARFLINKER_PARALLEL_DIEGENERATOR_H
#define LLVM_LIB_DWARFLINKER_PARALLEL_DIEGENERATOR_H
#include "DWARFLinkerGlobalData.h"
#include "DWARFLinkerUnit.h"
#include "llvm/CodeGen/DIE.h"
#include "llvm/Support/LEB128.h"
namespace llvm {
namespace dwarf_linker {
namespace parallel {
/// This class is a helper to create output DIE tree.
class DIEGenerator {
public:
DIEGenerator(BumpPtrAllocator &Allocator, DwarfUnit &CU)
: Allocator(Allocator), CU(CU) {}
DIEGenerator(DIE *OutputDIE, BumpPtrAllocator &Allocator, DwarfUnit &CU)
: Allocator(Allocator), CU(CU), OutputDIE(OutputDIE) {}
/// Creates a DIE of specified tag \p DieTag and \p OutOffset.
DIE *createDIE(dwarf::Tag DieTag, uint32_t OutOffset) {
OutputDIE = DIE::get(Allocator, DieTag);
OutputDIE->setOffset(OutOffset);
return OutputDIE;
}
DIE *getDIE() { return OutputDIE; }
/// Adds a specified \p Child to the current DIE.
void addChild(DIE *Child) {
assert(Child != nullptr);
assert(OutputDIE != nullptr);
OutputDIE->addChild(Child);
}
/// Adds specified scalar attribute to the current DIE.
std::pair<DIEValue &, size_t> addScalarAttribute(dwarf::Attribute Attr,
dwarf::Form AttrForm,
uint64_t Value) {
return addAttribute(Attr, AttrForm, DIEInteger(Value));
}
/// Adds specified location attribute to the current DIE.
std::pair<DIEValue &, size_t> addLocationAttribute(dwarf::Attribute Attr,
dwarf::Form AttrForm,
ArrayRef<uint8_t> Bytes) {
DIELoc *Loc = new (Allocator) DIELoc;
for (auto Byte : Bytes)
static_cast<DIEValueList *>(Loc)->addValue(
Allocator, static_cast<dwarf::Attribute>(0), dwarf::DW_FORM_data1,
DIEInteger(Byte));
Loc->setSize(Bytes.size());
return addAttribute(Attr, AttrForm, Loc);
}
/// Adds specified block or exprloc attribute to the current DIE.
std::pair<DIEValue &, size_t> addBlockAttribute(dwarf::Attribute Attr,
dwarf::Form AttrForm,
ArrayRef<uint8_t> Bytes) {
// The expression location data might be updated and exceed the original
// size. Check whether the new data fits into the original form.
assert((AttrForm == dwarf::DW_FORM_block) ||
(AttrForm == dwarf::DW_FORM_exprloc) ||
(AttrForm == dwarf::DW_FORM_block1 && Bytes.size() <= UINT8_MAX) ||
(AttrForm == dwarf::DW_FORM_block2 && Bytes.size() <= UINT16_MAX) ||
(AttrForm == dwarf::DW_FORM_block4 && Bytes.size() <= UINT32_MAX));
DIEBlock *Block = new (Allocator) DIEBlock;
for (auto Byte : Bytes)
static_cast<DIEValueList *>(Block)->addValue(
Allocator, static_cast<dwarf::Attribute>(0), dwarf::DW_FORM_data1,
DIEInteger(Byte));
Block->setSize(Bytes.size());
return addAttribute(Attr, AttrForm, Block);
}
/// Adds specified location list attribute to the current DIE.
std::pair<DIEValue &, size_t> addLocListAttribute(dwarf::Attribute Attr,
dwarf::Form AttrForm,
uint64_t Value) {
return addAttribute(Attr, AttrForm, DIELocList(Value));
}
/// Adds indexed string attribute.
std::pair<DIEValue &, size_t> addIndexedStringAttribute(dwarf::Attribute Attr,
dwarf::Form AttrForm,
uint64_t Idx) {
assert(AttrForm == dwarf::DW_FORM_strx);
return addAttribute(Attr, AttrForm, DIEInteger(Idx));
}
/// Adds string attribute with dummy offset to the current DIE.
std::pair<DIEValue &, size_t>
addStringPlaceholderAttribute(dwarf::Attribute Attr, dwarf::Form AttrForm) {
assert(AttrForm == dwarf::DW_FORM_strp ||
AttrForm == dwarf::DW_FORM_line_strp);
return addAttribute(Attr, AttrForm, DIEInteger(0xBADDEF));
}
/// Adds inplace string attribute to the current DIE.
std::pair<DIEValue &, size_t> addInplaceString(dwarf::Attribute Attr,
StringRef String) {
DIEBlock *Block = new (Allocator) DIEBlock;
for (auto Byte : String.bytes())
static_cast<DIEValueList *>(Block)->addValue(
Allocator, static_cast<dwarf::Attribute>(0), dwarf::DW_FORM_data1,
DIEInteger(Byte));
static_cast<DIEValueList *>(Block)->addValue(
Allocator, static_cast<dwarf::Attribute>(0), dwarf::DW_FORM_data1,
DIEInteger(0));
Block->setSize(String.size() + 1);
DIEValue &ValueRef =
*OutputDIE->addValue(Allocator, Attr, dwarf::DW_FORM_string, Block);
return std::pair<DIEValue &, size_t>(ValueRef, String.size() + 1);
}
/// Creates appreviations for the current DIE. Returns value of
/// abbreviation number. Updates offsets with the size of abbreviation
/// number.
size_t finalizeAbbreviations(bool CHILDREN_yes,
OffsetsPtrVector *OffsetsList) {
// Create abbreviations for output DIE.
DIEAbbrev NewAbbrev = OutputDIE->generateAbbrev();
if (CHILDREN_yes)
NewAbbrev.setChildrenFlag(dwarf::DW_CHILDREN_yes);
CU.assignAbbrev(NewAbbrev);
OutputDIE->setAbbrevNumber(NewAbbrev.getNumber());
size_t AbbrevNumberSize = getULEB128Size(OutputDIE->getAbbrevNumber());
// Add size of abbreviation number to the offsets.
if (OffsetsList != nullptr) {
for (uint64_t *OffsetPtr : *OffsetsList)
*OffsetPtr += AbbrevNumberSize;
}
return AbbrevNumberSize;
}
protected:
template <typename T>
std::pair<DIEValue &, size_t> addAttribute(dwarf::Attribute Attr,
dwarf::Form AttrForm, T &&Value) {
DIEValue &ValueRef =
*OutputDIE->addValue(Allocator, Attr, AttrForm, std::forward<T>(Value));
unsigned ValueSize = ValueRef.sizeOf(CU.getFormParams());
return std::pair<DIEValue &, size_t>(ValueRef, ValueSize);
}
// Allocator for output DIEs and values.
BumpPtrAllocator &Allocator;
// Unit for the output DIE.
DwarfUnit &CU;
// OutputDIE.
DIE *OutputDIE = nullptr;
};
} // end of namespace parallel
} // end of namespace dwarf_linker
} // end of namespace llvm
#endif // LLVM_LIB_DWARFLINKER_PARALLEL_DIEGENERATOR_H
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