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

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//===--- lib/CodeGen/DIE.cpp - DWARF Info Entries -------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Data structures for DWARF info entries.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/DIE.h"
#include "DwarfCompileUnit.h"
#include "DwarfDebug.h"
#include "DwarfUnit.h"
#include "llvm/ADT/Twine.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.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/FormattedStream.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/MD5.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
// 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));
}
//===----------------------------------------------------------------------===//
// 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));
// Emit whether it has children DIEs.
AP->EmitULEB128((unsigned)Children, dwarf::ChildrenString(Children));
// 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()));
// Emit form type.
AP->EmitULEB128(AttrData.getForm(),
dwarf::FormEncodingString(AttrData.getForm()));
}
// Mark end of abbreviation.
AP->EmitULEB128(0, "EOM(1)");
AP->EmitULEB128(0, "EOM(2)");
}
LLVM_DUMP_METHOD
void DIEAbbrev::print(raw_ostream &O) {
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())
<< '\n';
}
}
LLVM_DUMP_METHOD
void DIEAbbrev::dump() { print(dbgs()); }
DIEAbbrev DIE::generateAbbrev() const {
DIEAbbrev Abbrev(Tag, hasChildren());
for (const DIEValue &V : values())
Abbrev.AddAttribute(V.getAttribute(), V.getForm());
return Abbrev;
}
/// Climb up the parent chain to get the unit DIE to which this DIE
/// belongs.
const DIE *DIE::getUnit() const {
const DIE *Cu = getUnitOrNull();
assert(Cu && "We should not have orphaned DIEs.");
return Cu;
}
/// Climb up the parent chain to get the unit DIE this DIE belongs
/// to. Return NULL if DIE is not added to an owner yet.
const DIE *DIE::getUnitOrNull() const {
const DIE *p = this;
while (p) {
if (p->getTag() == dwarf::DW_TAG_compile_unit ||
p->getTag() == dwarf::DW_TAG_type_unit)
return p;
p = p->getParent();
}
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";
}
LLVM_DUMP_METHOD
void DIE::dump() {
print(dbgs());
}
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 AsmPrinter *AP) const {
switch (Ty) {
case isNone:
llvm_unreachable("Expected valid DIEValue");
#define HANDLE_DIEVALUE(T) \
case is##T: \
return getDIE##T().SizeOf(AP, 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"
}
}
LLVM_DUMP_METHOD
void DIEValue::dump() const {
print(dbgs());
}
//===----------------------------------------------------------------------===//
// DIEInteger Implementation
//===----------------------------------------------------------------------===//
/// EmitValue - Emit integer of appropriate size.
///
void DIEInteger::EmitValue(const AsmPrinter *Asm, dwarf::Form Form) const {
unsigned Size = ~0U;
switch (Form) {
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: LLVM_FALLTHROUGH;
case dwarf::DW_FORM_ref1: LLVM_FALLTHROUGH;
case dwarf::DW_FORM_data1: Size = 1; break;
case dwarf::DW_FORM_ref2: LLVM_FALLTHROUGH;
case dwarf::DW_FORM_data2: Size = 2; break;
case dwarf::DW_FORM_sec_offset: LLVM_FALLTHROUGH;
case dwarf::DW_FORM_strp: LLVM_FALLTHROUGH;
case dwarf::DW_FORM_ref4: LLVM_FALLTHROUGH;
case dwarf::DW_FORM_data4: Size = 4; break;
case dwarf::DW_FORM_ref8: LLVM_FALLTHROUGH;
case dwarf::DW_FORM_ref_sig8: LLVM_FALLTHROUGH;
case dwarf::DW_FORM_data8: Size = 8; break;
case dwarf::DW_FORM_GNU_str_index: Asm->EmitULEB128(Integer); return;
case dwarf::DW_FORM_GNU_addr_index: Asm->EmitULEB128(Integer); return;
case dwarf::DW_FORM_udata: Asm->EmitULEB128(Integer); return;
case dwarf::DW_FORM_sdata: Asm->EmitSLEB128(Integer); return;
case dwarf::DW_FORM_addr:
Size = Asm->getPointerSize();
break;
case dwarf::DW_FORM_ref_addr:
Size = SizeOf(Asm, dwarf::DW_FORM_ref_addr);
break;
default: llvm_unreachable("DIE Value form not supported yet");
}
Asm->OutStreamer->EmitIntValue(Integer, Size);
}
/// SizeOf - Determine size of integer value in bytes.
///
unsigned DIEInteger::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
switch (Form) {
case dwarf::DW_FORM_flag_present: return 0;
case dwarf::DW_FORM_flag: LLVM_FALLTHROUGH;
case dwarf::DW_FORM_ref1: LLVM_FALLTHROUGH;
case dwarf::DW_FORM_data1: return sizeof(int8_t);
case dwarf::DW_FORM_ref2: LLVM_FALLTHROUGH;
case dwarf::DW_FORM_data2: return sizeof(int16_t);
case dwarf::DW_FORM_sec_offset: LLVM_FALLTHROUGH;
case dwarf::DW_FORM_strp: LLVM_FALLTHROUGH;
case dwarf::DW_FORM_ref4: LLVM_FALLTHROUGH;
case dwarf::DW_FORM_data4: return sizeof(int32_t);
case dwarf::DW_FORM_ref8: LLVM_FALLTHROUGH;
case dwarf::DW_FORM_ref_sig8: LLVM_FALLTHROUGH;
case dwarf::DW_FORM_data8: return sizeof(int64_t);
case dwarf::DW_FORM_GNU_str_index: return getULEB128Size(Integer);
case dwarf::DW_FORM_GNU_addr_index: return getULEB128Size(Integer);
case dwarf::DW_FORM_udata: return getULEB128Size(Integer);
case dwarf::DW_FORM_sdata: return getSLEB128Size(Integer);
case dwarf::DW_FORM_addr:
return AP->getPointerSize();
case dwarf::DW_FORM_ref_addr:
if (AP->OutStreamer->getContext().getDwarfVersion() == 2)
return AP->getPointerSize();
return sizeof(int32_t);
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->OutStreamer->EmitValue(Expr, SizeOf(AP, Form));
}
/// SizeOf - Determine size of expression value in bytes.
///
unsigned DIEExpr::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
if (Form == dwarf::DW_FORM_data4) return 4;
if (Form == dwarf::DW_FORM_sec_offset) return 4;
if (Form == dwarf::DW_FORM_strp) return 4;
return AP->getPointerSize();
}
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 {
AP->EmitLabelReference(Label, SizeOf(AP, Form),
Form == dwarf::DW_FORM_strp ||
Form == dwarf::DW_FORM_sec_offset ||
Form == dwarf::DW_FORM_ref_addr);
}
/// SizeOf - Determine size of label value in bytes.
///
unsigned DIELabel::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
if (Form == dwarf::DW_FORM_data4) return 4;
if (Form == dwarf::DW_FORM_sec_offset) return 4;
if (Form == dwarf::DW_FORM_strp) return 4;
return AP->getPointerSize();
}
LLVM_DUMP_METHOD
void DIELabel::print(raw_ostream &O) const { O << "Lbl: " << Label->getName(); }
//===----------------------------------------------------------------------===//
// DIEDelta Implementation
//===----------------------------------------------------------------------===//
/// EmitValue - Emit delta value.
///
void DIEDelta::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
AP->EmitLabelDifference(LabelHi, LabelLo, SizeOf(AP, Form));
}
/// SizeOf - Determine size of delta value in bytes.
///
unsigned DIEDelta::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
if (Form == dwarf::DW_FORM_data4) return 4;
if (Form == dwarf::DW_FORM_sec_offset) return 4;
if (Form == dwarf::DW_FORM_strp) return 4;
return AP->getPointerSize();
}
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 {
assert(
(Form == dwarf::DW_FORM_strp || Form == dwarf::DW_FORM_GNU_str_index) &&
"Expected valid string form");
// Index of string in symbol table.
if (Form == dwarf::DW_FORM_GNU_str_index) {
DIEInteger(S.getIndex()).EmitValue(AP, Form);
return;
}
// Relocatable symbol.
assert(Form == dwarf::DW_FORM_strp);
if (AP->MAI->doesDwarfUseRelocationsAcrossSections()) {
DIELabel(S.getSymbol()).EmitValue(AP, Form);
return;
}
// Offset into symbol table.
DIEInteger(S.getOffset()).EmitValue(AP, Form);
}
/// SizeOf - Determine size of delta value in bytes.
///
unsigned DIEString::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
assert(
(Form == dwarf::DW_FORM_strp || Form == dwarf::DW_FORM_GNU_str_index) &&
"Expected valid string form");
// Index of string in symbol table.
if (Form == dwarf::DW_FORM_GNU_str_index)
return DIEInteger(S.getIndex()).SizeOf(AP, Form);
// Relocatable symbol.
if (AP->MAI->doesDwarfUseRelocationsAcrossSections())
return DIELabel(S.getSymbol()).SizeOf(AP, Form);
// Offset into symbol table.
return DIEInteger(S.getOffset()).SizeOf(AP, Form);
}
LLVM_DUMP_METHOD
void DIEString::print(raw_ostream &O) const {
O << "String: " << S.getString();
}
//===----------------------------------------------------------------------===//
// DIEEntry Implementation
//===----------------------------------------------------------------------===//
/// EmitValue - Emit debug information entry offset.
///
void DIEEntry::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
if (Form == dwarf::DW_FORM_ref_addr) {
const DwarfDebug *DD = AP->getDwarfDebug();
unsigned Addr = Entry->getOffset();
assert(!DD->useSplitDwarf() && "TODO: dwo files can't have relocations.");
// For DW_FORM_ref_addr, output the offset from beginning of debug info
// section. Entry->getOffset() returns the offset from start of the
// compile unit.
DwarfCompileUnit *CU = DD->lookupUnit(Entry->getUnit());
assert(CU && "CUDie should belong to a CU.");
Addr += CU->getDebugInfoOffset();
if (AP->MAI->doesDwarfUseRelocationsAcrossSections())
AP->EmitLabelPlusOffset(CU->getSectionSym(), Addr,
DIEEntry::getRefAddrSize(AP));
else
AP->OutStreamer->EmitIntValue(Addr, DIEEntry::getRefAddrSize(AP));
} else
AP->EmitInt32(Entry->getOffset());
}
unsigned DIEEntry::getRefAddrSize(const AsmPrinter *AP) {
// DWARF4: References that use the attribute form DW_FORM_ref_addr are
// specified to be four bytes in the DWARF 32-bit format and eight bytes
// in the DWARF 64-bit format, while DWARF Version 2 specifies that such
// references have the same size as an address on the target system.
const DwarfDebug *DD = AP->getDwarfDebug();
assert(DD && "Expected Dwarf Debug info to be available");
if (DD->getDwarfVersion() == 2)
return AP->getPointerSize();
return sizeof(int32_t);
}
LLVM_DUMP_METHOD
void DIEEntry::print(raw_ostream &O) const {
O << format("Die: 0x%lx", (long)(intptr_t)&Entry);
}
//===----------------------------------------------------------------------===//
// DIELoc Implementation
//===----------------------------------------------------------------------===//
/// ComputeSize - calculate the size of the location expression.
///
unsigned DIELoc::ComputeSize(const AsmPrinter *AP) const {
if (!Size) {
for (const auto &V : values())
Size += V.SizeOf(AP);
}
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 AsmPrinter *AP, 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
//===----------------------------------------------------------------------===//
/// ComputeSize - calculate the size of the block.
///
unsigned DIEBlock::ComputeSize(const AsmPrinter *AP) const {
if (!Size) {
for (const auto &V : values())
Size += V.SizeOf(AP);
}
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_block: Asm->EmitULEB128(Size); break;
}
for (const auto &V : values())
V.EmitValue(Asm);
}
/// SizeOf - Determine size of block data in bytes.
///
unsigned DIEBlock::SizeOf(const AsmPrinter *AP, 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: return Size + getULEB128Size(Size);
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 AsmPrinter *AP, dwarf::Form Form) const {
if (Form == dwarf::DW_FORM_data4)
return 4;
if (Form == dwarf::DW_FORM_sec_offset)
return 4;
return AP->getPointerSize();
}
/// EmitValue - Emit label value.
///
void DIELocList::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
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; }
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