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llvm-project/llvm/lib/CodeGen/AsmPrinter/DIE.cpp

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//===--- lib/CodeGen/DIE.cpp - DWARF Info Entries -------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Data structures for DWARF info entries.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/DIE.h"
#include "DwarfCompileUnit.h"
#include "DwarfDebug.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
#define DEBUG_TYPE "dwarfdebug"
//===----------------------------------------------------------------------===//
// DIEAbbrevData Implementation
//===----------------------------------------------------------------------===//
/// Profile - Used to gather unique data for the abbreviation folding set.
///
void DIEAbbrevData::Profile(FoldingSetNodeID &ID) const {
// Explicitly cast to an integer type for which FoldingSetNodeID has
// overloads. Otherwise MSVC 2010 thinks this call is ambiguous.
ID.AddInteger(unsigned(Attribute));
ID.AddInteger(unsigned(Form));
if (Form == dwarf::DW_FORM_implicit_const)
ID.AddInteger(Value);
}
//===----------------------------------------------------------------------===//
// DIEAbbrev Implementation
//===----------------------------------------------------------------------===//
/// Profile - Used to gather unique data for the abbreviation folding set.
///
void DIEAbbrev::Profile(FoldingSetNodeID &ID) const {
ID.AddInteger(unsigned(Tag));
ID.AddInteger(unsigned(Children));
// For each attribute description.
for (unsigned i = 0, N = Data.size(); i < N; ++i)
Data[i].Profile(ID);
}
/// Emit - Print the abbreviation using the specified asm printer.
///
void DIEAbbrev::Emit(const AsmPrinter *AP) const {
// Emit its Dwarf tag type.
AP->emitULEB128(Tag, dwarf::TagString(Tag).data());
// Emit whether it has children DIEs.
AP->emitULEB128((unsigned)Children, dwarf::ChildrenString(Children).data());
// For each attribute description.
for (unsigned i = 0, N = Data.size(); i < N; ++i) {
const DIEAbbrevData &AttrData = Data[i];
// Emit attribute type.
AP->emitULEB128(AttrData.getAttribute(),
dwarf::AttributeString(AttrData.getAttribute()).data());
// Emit form type.
#ifndef NDEBUG
// Could be an assertion, but this way we can see the failing form code
// easily, which helps track down where it came from.
if (!dwarf::isValidFormForVersion(AttrData.getForm(),
AP->getDwarfVersion())) {
LLVM_DEBUG(dbgs() << "Invalid form " << format("0x%x", AttrData.getForm())
<< " for DWARF version " << AP->getDwarfVersion()
<< "\n");
llvm_unreachable("Invalid form for specified DWARF version");
}
#endif
AP->emitULEB128(AttrData.getForm(),
dwarf::FormEncodingString(AttrData.getForm()).data());
// Emit value for DW_FORM_implicit_const.
if (AttrData.getForm() == dwarf::DW_FORM_implicit_const)
AP->emitSLEB128(AttrData.getValue());
}
// Mark end of abbreviation.
AP->emitULEB128(0, "EOM(1)");
AP->emitULEB128(0, "EOM(2)");
}
LLVM_DUMP_METHOD
void DIEAbbrev::print(raw_ostream &O) const {
O << "Abbreviation @"
<< format("0x%lx", (long)(intptr_t)this)
<< " "
<< dwarf::TagString(Tag)
<< " "
<< dwarf::ChildrenString(Children)
<< '\n';
for (unsigned i = 0, N = Data.size(); i < N; ++i) {
O << " "
<< dwarf::AttributeString(Data[i].getAttribute())
<< " "
<< dwarf::FormEncodingString(Data[i].getForm());
if (Data[i].getForm() == dwarf::DW_FORM_implicit_const)
O << " " << Data[i].getValue();
O << '\n';
}
}
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void DIEAbbrev::dump() const {
print(dbgs());
}
#endif
//===----------------------------------------------------------------------===//
// DIEAbbrevSet Implementation
//===----------------------------------------------------------------------===//
DIEAbbrevSet::~DIEAbbrevSet() {
for (DIEAbbrev *Abbrev : Abbreviations)
Abbrev->~DIEAbbrev();
}
DIEAbbrev &DIEAbbrevSet::uniqueAbbreviation(DIE &Die) {
FoldingSetNodeID ID;
DIEAbbrev Abbrev = Die.generateAbbrev();
Abbrev.Profile(ID);
void *InsertPos;
if (DIEAbbrev *Existing =
AbbreviationsSet.FindNodeOrInsertPos(ID, InsertPos)) {
Die.setAbbrevNumber(Existing->getNumber());
return *Existing;
}
// Move the abbreviation to the heap and assign a number.
DIEAbbrev *New = new (Alloc) DIEAbbrev(std::move(Abbrev));
Abbreviations.push_back(New);
New->setNumber(Abbreviations.size());
Die.setAbbrevNumber(Abbreviations.size());
// Store it for lookup.
AbbreviationsSet.InsertNode(New, InsertPos);
return *New;
}
void DIEAbbrevSet::Emit(const AsmPrinter *AP, MCSection *Section) const {
if (!Abbreviations.empty()) {
// Start the debug abbrev section.
AP->OutStreamer->switchSection(Section);
AP->emitDwarfAbbrevs(Abbreviations);
}
}
//===----------------------------------------------------------------------===//
// DIE Implementation
//===----------------------------------------------------------------------===//
DIE *DIE::getParent() const {
return Owner.dyn_cast<DIE*>();
}
DIEAbbrev DIE::generateAbbrev() const {
DIEAbbrev Abbrev(Tag, hasChildren());
for (const DIEValue &V : values())
if (V.getForm() == dwarf::DW_FORM_implicit_const)
Abbrev.AddImplicitConstAttribute(V.getAttribute(),
V.getDIEInteger().getValue());
else
Abbrev.AddAttribute(V.getAttribute(), V.getForm());
return Abbrev;
}
uint64_t DIE::getDebugSectionOffset() const {
const DIEUnit *Unit = getUnit();
assert(Unit && "DIE must be owned by a DIEUnit to get its absolute offset");
return Unit->getDebugSectionOffset() + getOffset();
}
const DIE *DIE::getUnitDie() const {
const DIE *p = this;
while (p) {
if (p->getTag() == dwarf::DW_TAG_compile_unit ||
p->getTag() == dwarf::DW_TAG_skeleton_unit ||
p->getTag() == dwarf::DW_TAG_type_unit)
return p;
p = p->getParent();
}
return nullptr;
}
DIEUnit *DIE::getUnit() const {
const DIE *UnitDie = getUnitDie();
if (UnitDie)
return UnitDie->Owner.dyn_cast<DIEUnit*>();
return nullptr;
}
DIEValue DIE::findAttribute(dwarf::Attribute Attribute) const {
// Iterate through all the attributes until we find the one we're
// looking for, if we can't find it return NULL.
for (const auto &V : values())
if (V.getAttribute() == Attribute)
return V;
return DIEValue();
}
LLVM_DUMP_METHOD
static void printValues(raw_ostream &O, const DIEValueList &Values,
StringRef Type, unsigned Size, unsigned IndentCount) {
O << Type << ": Size: " << Size << "\n";
unsigned I = 0;
const std::string Indent(IndentCount, ' ');
for (const auto &V : Values.values()) {
O << Indent;
O << "Blk[" << I++ << "]";
O << " " << dwarf::FormEncodingString(V.getForm()) << " ";
V.print(O);
O << "\n";
}
}
LLVM_DUMP_METHOD
void DIE::print(raw_ostream &O, unsigned IndentCount) const {
const std::string Indent(IndentCount, ' ');
O << Indent << "Die: " << format("0x%lx", (long)(intptr_t) this)
<< ", Offset: " << Offset << ", Size: " << Size << "\n";
O << Indent << dwarf::TagString(getTag()) << " "
<< dwarf::ChildrenString(hasChildren()) << "\n";
IndentCount += 2;
for (const auto &V : values()) {
O << Indent;
O << dwarf::AttributeString(V.getAttribute());
O << " " << dwarf::FormEncodingString(V.getForm()) << " ";
V.print(O);
O << "\n";
}
IndentCount -= 2;
for (const auto &Child : children())
Child.print(O, IndentCount + 4);
O << "\n";
}
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void DIE::dump() const {
print(dbgs());
}
#endif
unsigned DIE::computeOffsetsAndAbbrevs(const dwarf::FormParams &FormParams,
DIEAbbrevSet &AbbrevSet,
unsigned CUOffset) {
// Unique the abbreviation and fill in the abbreviation number so this DIE
// can be emitted.
const DIEAbbrev &Abbrev = AbbrevSet.uniqueAbbreviation(*this);
// Set compile/type unit relative offset of this DIE.
setOffset(CUOffset);
// Add the byte size of the abbreviation code.
CUOffset += getULEB128Size(getAbbrevNumber());
// Add the byte size of all the DIE attribute values.
for (const auto &V : values())
CUOffset += V.sizeOf(FormParams);
// Let the children compute their offsets and abbreviation numbers.
if (hasChildren()) {
(void)Abbrev;
assert(Abbrev.hasChildren() && "Children flag not set");
for (auto &Child : children())
CUOffset =
Child.computeOffsetsAndAbbrevs(FormParams, AbbrevSet, CUOffset);
// Each child chain is terminated with a zero byte, adjust the offset.
CUOffset += sizeof(int8_t);
}
// Compute the byte size of this DIE and all of its children correctly. This
// is needed so that top level DIE can help the compile unit set its length
// correctly.
setSize(CUOffset - getOffset());
return CUOffset;
}
//===----------------------------------------------------------------------===//
// DIEUnit Implementation
//===----------------------------------------------------------------------===//
DIEUnit::DIEUnit(dwarf::Tag UnitTag) : Die(UnitTag) {
Die.Owner = this;
assert((UnitTag == dwarf::DW_TAG_compile_unit ||
UnitTag == dwarf::DW_TAG_skeleton_unit ||
UnitTag == dwarf::DW_TAG_type_unit ||
UnitTag == dwarf::DW_TAG_partial_unit) &&
"expected a unit TAG");
}
void DIEValue::emitValue(const AsmPrinter *AP) const {
switch (Ty) {
case isNone:
llvm_unreachable("Expected valid DIEValue");
#define HANDLE_DIEVALUE(T) \
case is##T: \
getDIE##T().emitValue(AP, Form); \
break;
#include "llvm/CodeGen/DIEValue.def"
}
}
unsigned DIEValue::sizeOf(const dwarf::FormParams &FormParams) const {
switch (Ty) {
case isNone:
llvm_unreachable("Expected valid DIEValue");
#define HANDLE_DIEVALUE(T) \
case is##T: \
return getDIE##T().sizeOf(FormParams, Form);
#include "llvm/CodeGen/DIEValue.def"
}
llvm_unreachable("Unknown DIE kind");
}
LLVM_DUMP_METHOD
void DIEValue::print(raw_ostream &O) const {
switch (Ty) {
case isNone:
llvm_unreachable("Expected valid DIEValue");
#define HANDLE_DIEVALUE(T) \
case is##T: \
getDIE##T().print(O); \
break;
#include "llvm/CodeGen/DIEValue.def"
}
}
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void DIEValue::dump() const {
print(dbgs());
}
#endif
//===----------------------------------------------------------------------===//
// DIEInteger Implementation
//===----------------------------------------------------------------------===//
/// EmitValue - Emit integer of appropriate size.
///
void DIEInteger::emitValue(const AsmPrinter *Asm, dwarf::Form Form) const {
switch (Form) {
case dwarf::DW_FORM_implicit_const:
case dwarf::DW_FORM_flag_present:
// Emit something to keep the lines and comments in sync.
// FIXME: Is there a better way to do this?
Asm->OutStreamer->addBlankLine();
return;
case dwarf::DW_FORM_flag:
case dwarf::DW_FORM_ref1:
case dwarf::DW_FORM_data1:
case dwarf::DW_FORM_strx1:
case dwarf::DW_FORM_addrx1:
case dwarf::DW_FORM_ref2:
case dwarf::DW_FORM_data2:
case dwarf::DW_FORM_strx2:
case dwarf::DW_FORM_addrx2:
case dwarf::DW_FORM_strx3:
case dwarf::DW_FORM_strp:
case dwarf::DW_FORM_ref4:
case dwarf::DW_FORM_data4:
case dwarf::DW_FORM_ref_sup4:
case dwarf::DW_FORM_strx4:
case dwarf::DW_FORM_addrx4:
case dwarf::DW_FORM_ref8:
case dwarf::DW_FORM_ref_sig8:
case dwarf::DW_FORM_data8:
case dwarf::DW_FORM_ref_sup8:
case dwarf::DW_FORM_GNU_ref_alt:
case dwarf::DW_FORM_GNU_strp_alt:
case dwarf::DW_FORM_line_strp:
case dwarf::DW_FORM_sec_offset:
case dwarf::DW_FORM_strp_sup:
case dwarf::DW_FORM_addr:
case dwarf::DW_FORM_ref_addr:
Asm->OutStreamer->emitIntValue(Integer,
sizeOf(Asm->getDwarfFormParams(), Form));
return;
case dwarf::DW_FORM_GNU_str_index:
case dwarf::DW_FORM_GNU_addr_index:
case dwarf::DW_FORM_ref_udata:
case dwarf::DW_FORM_strx:
case dwarf::DW_FORM_addrx:
case dwarf::DW_FORM_rnglistx:
case dwarf::DW_FORM_udata:
Asm->emitULEB128(Integer);
return;
case dwarf::DW_FORM_sdata:
Asm->emitSLEB128(Integer);
return;
default: llvm_unreachable("DIE Value form not supported yet");
}
}
/// sizeOf - Determine size of integer value in bytes.
///
unsigned DIEInteger::sizeOf(const dwarf::FormParams &FormParams,
dwarf::Form Form) const {
if (Optional<uint8_t> FixedSize =
dwarf::getFixedFormByteSize(Form, FormParams))
return *FixedSize;
switch (Form) {
case dwarf::DW_FORM_GNU_str_index:
case dwarf::DW_FORM_GNU_addr_index:
case dwarf::DW_FORM_ref_udata:
case dwarf::DW_FORM_strx:
case dwarf::DW_FORM_addrx:
case dwarf::DW_FORM_rnglistx:
case dwarf::DW_FORM_udata:
return getULEB128Size(Integer);
case dwarf::DW_FORM_sdata:
return getSLEB128Size(Integer);
default: llvm_unreachable("DIE Value form not supported yet");
}
}
LLVM_DUMP_METHOD
void DIEInteger::print(raw_ostream &O) const {
O << "Int: " << (int64_t)Integer << " 0x";
O.write_hex(Integer);
}
//===----------------------------------------------------------------------===//
// DIEExpr Implementation
//===----------------------------------------------------------------------===//
/// EmitValue - Emit expression value.
///
void DIEExpr::emitValue(const AsmPrinter *AP, dwarf::Form Form) const {
AP->emitDebugValue(Expr, sizeOf(AP->getDwarfFormParams(), Form));
}
/// SizeOf - Determine size of expression value in bytes.
///
unsigned DIEExpr::sizeOf(const dwarf::FormParams &FormParams,
dwarf::Form Form) const {
switch (Form) {
case dwarf::DW_FORM_data4:
return 4;
case dwarf::DW_FORM_data8:
return 8;
case dwarf::DW_FORM_sec_offset:
return FormParams.getDwarfOffsetByteSize();
default:
llvm_unreachable("DIE Value form not supported yet");
}
}
LLVM_DUMP_METHOD
void DIEExpr::print(raw_ostream &O) const { O << "Expr: " << *Expr; }
//===----------------------------------------------------------------------===//
// DIELabel Implementation
//===----------------------------------------------------------------------===//
/// EmitValue - Emit label value.
///
void DIELabel::emitValue(const AsmPrinter *AP, dwarf::Form Form) const {
bool IsSectionRelative = Form != dwarf::DW_FORM_addr;
AP->emitLabelReference(Label, sizeOf(AP->getDwarfFormParams(), Form),
IsSectionRelative);
}
/// sizeOf - Determine size of label value in bytes.
///
unsigned DIELabel::sizeOf(const dwarf::FormParams &FormParams,
dwarf::Form Form) const {
switch (Form) {
case dwarf::DW_FORM_data4:
return 4;
case dwarf::DW_FORM_data8:
return 8;
case dwarf::DW_FORM_sec_offset:
case dwarf::DW_FORM_strp:
return FormParams.getDwarfOffsetByteSize();
case dwarf::DW_FORM_addr:
return FormParams.AddrSize;
default:
llvm_unreachable("DIE Value form not supported yet");
}
}
LLVM_DUMP_METHOD
void DIELabel::print(raw_ostream &O) const { O << "Lbl: " << Label->getName(); }
//===----------------------------------------------------------------------===//
// DIEBaseTypeRef Implementation
//===----------------------------------------------------------------------===//
void DIEBaseTypeRef::emitValue(const AsmPrinter *AP, dwarf::Form Form) const {
uint64_t Offset = CU->ExprRefedBaseTypes[Index].Die->getOffset();
assert(Offset < (1ULL << (ULEB128PadSize * 7)) && "Offset wont fit");
AP->emitULEB128(Offset, nullptr, ULEB128PadSize);
}
unsigned DIEBaseTypeRef::sizeOf(const dwarf::FormParams &, dwarf::Form) const {
return ULEB128PadSize;
}
LLVM_DUMP_METHOD
void DIEBaseTypeRef::print(raw_ostream &O) const { O << "BaseTypeRef: " << Index; }
//===----------------------------------------------------------------------===//
// DIEDelta Implementation
//===----------------------------------------------------------------------===//
/// EmitValue - Emit delta value.
///
void DIEDelta::emitValue(const AsmPrinter *AP, dwarf::Form Form) const {
AP->emitLabelDifference(LabelHi, LabelLo,
sizeOf(AP->getDwarfFormParams(), Form));
}
/// SizeOf - Determine size of delta value in bytes.
///
unsigned DIEDelta::sizeOf(const dwarf::FormParams &FormParams,
dwarf::Form Form) const {
switch (Form) {
case dwarf::DW_FORM_data4:
return 4;
case dwarf::DW_FORM_data8:
return 8;
case dwarf::DW_FORM_sec_offset:
return FormParams.getDwarfOffsetByteSize();
default:
llvm_unreachable("DIE Value form not supported yet");
}
}
LLVM_DUMP_METHOD
void DIEDelta::print(raw_ostream &O) const {
O << "Del: " << LabelHi->getName() << "-" << LabelLo->getName();
}
//===----------------------------------------------------------------------===//
// DIEString Implementation
//===----------------------------------------------------------------------===//
/// EmitValue - Emit string value.
///
void DIEString::emitValue(const AsmPrinter *AP, dwarf::Form Form) const {
// Index of string in symbol table.
switch (Form) {
case dwarf::DW_FORM_GNU_str_index:
case dwarf::DW_FORM_strx:
case dwarf::DW_FORM_strx1:
case dwarf::DW_FORM_strx2:
case dwarf::DW_FORM_strx3:
case dwarf::DW_FORM_strx4:
DIEInteger(S.getIndex()).emitValue(AP, Form);
return;
case dwarf::DW_FORM_strp:
if (AP->MAI->doesDwarfUseRelocationsAcrossSections())
DIELabel(S.getSymbol()).emitValue(AP, Form);
else
DIEInteger(S.getOffset()).emitValue(AP, Form);
return;
default:
llvm_unreachable("Expected valid string form");
}
}
/// sizeOf - Determine size of delta value in bytes.
///
unsigned DIEString::sizeOf(const dwarf::FormParams &FormParams,
dwarf::Form Form) const {
// Index of string in symbol table.
switch (Form) {
case dwarf::DW_FORM_GNU_str_index:
case dwarf::DW_FORM_strx:
case dwarf::DW_FORM_strx1:
case dwarf::DW_FORM_strx2:
case dwarf::DW_FORM_strx3:
case dwarf::DW_FORM_strx4:
return DIEInteger(S.getIndex()).sizeOf(FormParams, Form);
case dwarf::DW_FORM_strp:
if (FormParams.DwarfUsesRelocationsAcrossSections)
return DIELabel(S.getSymbol()).sizeOf(FormParams, Form);
return DIEInteger(S.getOffset()).sizeOf(FormParams, Form);
default:
llvm_unreachable("Expected valid string form");
}
}
LLVM_DUMP_METHOD
void DIEString::print(raw_ostream &O) const {
O << "String: " << S.getString();
}
//===----------------------------------------------------------------------===//
// DIEInlineString Implementation
//===----------------------------------------------------------------------===//
void DIEInlineString::emitValue(const AsmPrinter *AP, dwarf::Form Form) const {
if (Form == dwarf::DW_FORM_string) {
AP->OutStreamer->emitBytes(S);
AP->emitInt8(0);
return;
}
llvm_unreachable("Expected valid string form");
}
unsigned DIEInlineString::sizeOf(const dwarf::FormParams &, dwarf::Form) const {
// Emit string bytes + NULL byte.
return S.size() + 1;
}
LLVM_DUMP_METHOD
void DIEInlineString::print(raw_ostream &O) const {
O << "InlineString: " << S;
}
//===----------------------------------------------------------------------===//
// DIEEntry Implementation
//===----------------------------------------------------------------------===//
/// EmitValue - Emit debug information entry offset.
///
void DIEEntry::emitValue(const AsmPrinter *AP, dwarf::Form Form) const {
switch (Form) {
case dwarf::DW_FORM_ref1:
case dwarf::DW_FORM_ref2:
case dwarf::DW_FORM_ref4:
case dwarf::DW_FORM_ref8:
AP->OutStreamer->emitIntValue(Entry->getOffset(),
sizeOf(AP->getDwarfFormParams(), Form));
return;
case dwarf::DW_FORM_ref_udata:
AP->emitULEB128(Entry->getOffset());
return;
case dwarf::DW_FORM_ref_addr: {
// Get the absolute offset for this DIE within the debug info/types section.
uint64_t Addr = Entry->getDebugSectionOffset();
if (const MCSymbol *SectionSym =
Entry->getUnit()->getCrossSectionRelativeBaseAddress()) {
AP->emitLabelPlusOffset(SectionSym, Addr,
sizeOf(AP->getDwarfFormParams(), Form), true);
return;
}
AP->OutStreamer->emitIntValue(Addr, sizeOf(AP->getDwarfFormParams(), Form));
return;
}
default:
llvm_unreachable("Improper form for DIE reference");
}
}
unsigned DIEEntry::sizeOf(const dwarf::FormParams &FormParams,
dwarf::Form Form) const {
switch (Form) {
case dwarf::DW_FORM_ref1:
return 1;
case dwarf::DW_FORM_ref2:
return 2;
case dwarf::DW_FORM_ref4:
return 4;
case dwarf::DW_FORM_ref8:
return 8;
case dwarf::DW_FORM_ref_udata:
return getULEB128Size(Entry->getOffset());
case dwarf::DW_FORM_ref_addr:
return FormParams.getRefAddrByteSize();
default:
llvm_unreachable("Improper form for DIE reference");
}
}
LLVM_DUMP_METHOD
void DIEEntry::print(raw_ostream &O) const {
O << format("Die: 0x%lx", (long)(intptr_t)&Entry);
}
//===----------------------------------------------------------------------===//
// DIELoc Implementation
//===----------------------------------------------------------------------===//
unsigned DIELoc::computeSize(const dwarf::FormParams &FormParams) const {
if (!Size) {
for (const auto &V : values())
Size += V.sizeOf(FormParams);
}
return Size;
}
/// EmitValue - Emit location data.
///
void DIELoc::emitValue(const AsmPrinter *Asm, dwarf::Form Form) const {
switch (Form) {
default: llvm_unreachable("Improper form for block");
case dwarf::DW_FORM_block1: Asm->emitInt8(Size); break;
case dwarf::DW_FORM_block2: Asm->emitInt16(Size); break;
case dwarf::DW_FORM_block4: Asm->emitInt32(Size); break;
case dwarf::DW_FORM_block:
case dwarf::DW_FORM_exprloc:
Asm->emitULEB128(Size);
break;
}
for (const auto &V : values())
V.emitValue(Asm);
}
/// sizeOf - Determine size of location data in bytes.
///
unsigned DIELoc::sizeOf(const dwarf::FormParams &, dwarf::Form Form) const {
switch (Form) {
case dwarf::DW_FORM_block1: return Size + sizeof(int8_t);
case dwarf::DW_FORM_block2: return Size + sizeof(int16_t);
case dwarf::DW_FORM_block4: return Size + sizeof(int32_t);
case dwarf::DW_FORM_block:
case dwarf::DW_FORM_exprloc:
return Size + getULEB128Size(Size);
default: llvm_unreachable("Improper form for block");
}
}
LLVM_DUMP_METHOD
void DIELoc::print(raw_ostream &O) const {
printValues(O, *this, "ExprLoc", Size, 5);
}
//===----------------------------------------------------------------------===//
// DIEBlock Implementation
//===----------------------------------------------------------------------===//
unsigned DIEBlock::computeSize(const dwarf::FormParams &FormParams) const {
if (!Size) {
for (const auto &V : values())
Size += V.sizeOf(FormParams);
}
return Size;
}
/// EmitValue - Emit block data.
///
void DIEBlock::emitValue(const AsmPrinter *Asm, dwarf::Form Form) const {
switch (Form) {
default: llvm_unreachable("Improper form for block");
case dwarf::DW_FORM_block1: Asm->emitInt8(Size); break;
case dwarf::DW_FORM_block2: Asm->emitInt16(Size); break;
case dwarf::DW_FORM_block4: Asm->emitInt32(Size); break;
case dwarf::DW_FORM_exprloc:
case dwarf::DW_FORM_block:
Asm->emitULEB128(Size);
break;
case dwarf::DW_FORM_string: break;
case dwarf::DW_FORM_data16: break;
}
for (const auto &V : values())
V.emitValue(Asm);
}
/// sizeOf - Determine size of block data in bytes.
///
unsigned DIEBlock::sizeOf(const dwarf::FormParams &, dwarf::Form Form) const {
switch (Form) {
case dwarf::DW_FORM_block1: return Size + sizeof(int8_t);
case dwarf::DW_FORM_block2: return Size + sizeof(int16_t);
case dwarf::DW_FORM_block4: return Size + sizeof(int32_t);
case dwarf::DW_FORM_exprloc:
case dwarf::DW_FORM_block: return Size + getULEB128Size(Size);
case dwarf::DW_FORM_data16: return 16;
default: llvm_unreachable("Improper form for block");
}
}
LLVM_DUMP_METHOD
void DIEBlock::print(raw_ostream &O) const {
printValues(O, *this, "Blk", Size, 5);
}
//===----------------------------------------------------------------------===//
// DIELocList Implementation
//===----------------------------------------------------------------------===//
unsigned DIELocList::sizeOf(const dwarf::FormParams &FormParams,
dwarf::Form Form) const {
switch (Form) {
case dwarf::DW_FORM_loclistx:
return getULEB128Size(Index);
case dwarf::DW_FORM_data4:
assert(FormParams.Format != dwarf::DWARF64 &&
"DW_FORM_data4 is not suitable to emit a pointer to a location list "
"in the 64-bit DWARF format");
return 4;
case dwarf::DW_FORM_data8:
assert(FormParams.Format == dwarf::DWARF64 &&
"DW_FORM_data8 is not suitable to emit a pointer to a location list "
"in the 32-bit DWARF format");
return 8;
case dwarf::DW_FORM_sec_offset:
return FormParams.getDwarfOffsetByteSize();
default:
llvm_unreachable("DIE Value form not supported yet");
}
}
/// EmitValue - Emit label value.
///
void DIELocList::emitValue(const AsmPrinter *AP, dwarf::Form Form) const {
if (Form == dwarf::DW_FORM_loclistx) {
AP->emitULEB128(Index);
return;
}
DwarfDebug *DD = AP->getDwarfDebug();
MCSymbol *Label = DD->getDebugLocs().getList(Index).Label;
AP->emitDwarfSymbolReference(Label, /*ForceOffset*/ DD->useSplitDwarf());
}
LLVM_DUMP_METHOD
void DIELocList::print(raw_ostream &O) const { O << "LocList: " << Index; }
//===----------------------------------------------------------------------===//
// DIEAddrOffset Implementation
//===----------------------------------------------------------------------===//
unsigned DIEAddrOffset::sizeOf(const dwarf::FormParams &FormParams,
dwarf::Form) const {
return Addr.sizeOf(FormParams, dwarf::DW_FORM_addrx) +
Offset.sizeOf(FormParams, dwarf::DW_FORM_data4);
}
/// EmitValue - Emit label value.
///
void DIEAddrOffset::emitValue(const AsmPrinter *AP, dwarf::Form Form) const {
Addr.emitValue(AP, dwarf::DW_FORM_addrx);
Offset.emitValue(AP, dwarf::DW_FORM_data4);
}
LLVM_DUMP_METHOD
void DIEAddrOffset::print(raw_ostream &O) const {
O << "AddrOffset: ";
Addr.print(O);
O << " + ";
Offset.print(O);
}
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