623 lines
20 KiB
C++
623 lines
20 KiB
C++
//===--- lib/CodeGen/DIE.cpp - DWARF Info Entries -------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Data structures for DWARF info entries.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/DIE.h"
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#include "DwarfCompileUnit.h"
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#include "DwarfDebug.h"
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#include "DwarfUnit.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/Support/LEB128.h"
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#include "llvm/Support/MD5.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// DIEAbbrevData Implementation
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//===----------------------------------------------------------------------===//
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/// Profile - Used to gather unique data for the abbreviation folding set.
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///
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void DIEAbbrevData::Profile(FoldingSetNodeID &ID) const {
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// Explicitly cast to an integer type for which FoldingSetNodeID has
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// overloads. Otherwise MSVC 2010 thinks this call is ambiguous.
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ID.AddInteger(unsigned(Attribute));
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ID.AddInteger(unsigned(Form));
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}
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//===----------------------------------------------------------------------===//
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// DIEAbbrev Implementation
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//===----------------------------------------------------------------------===//
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/// Profile - Used to gather unique data for the abbreviation folding set.
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///
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void DIEAbbrev::Profile(FoldingSetNodeID &ID) const {
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ID.AddInteger(unsigned(Tag));
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ID.AddInteger(unsigned(Children));
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// For each attribute description.
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for (unsigned i = 0, N = Data.size(); i < N; ++i)
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Data[i].Profile(ID);
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}
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/// Emit - Print the abbreviation using the specified asm printer.
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///
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void DIEAbbrev::Emit(const AsmPrinter *AP) const {
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// Emit its Dwarf tag type.
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AP->EmitULEB128(Tag, dwarf::TagString(Tag));
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// Emit whether it has children DIEs.
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AP->EmitULEB128((unsigned)Children, dwarf::ChildrenString(Children));
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// For each attribute description.
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for (unsigned i = 0, N = Data.size(); i < N; ++i) {
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const DIEAbbrevData &AttrData = Data[i];
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// Emit attribute type.
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AP->EmitULEB128(AttrData.getAttribute(),
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dwarf::AttributeString(AttrData.getAttribute()));
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// Emit form type.
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AP->EmitULEB128(AttrData.getForm(),
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dwarf::FormEncodingString(AttrData.getForm()));
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}
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// Mark end of abbreviation.
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AP->EmitULEB128(0, "EOM(1)");
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AP->EmitULEB128(0, "EOM(2)");
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}
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#ifndef NDEBUG
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void DIEAbbrev::print(raw_ostream &O) {
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O << "Abbreviation @"
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<< format("0x%lx", (long)(intptr_t)this)
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<< " "
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<< dwarf::TagString(Tag)
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<< " "
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<< dwarf::ChildrenString(Children)
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<< '\n';
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for (unsigned i = 0, N = Data.size(); i < N; ++i) {
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O << " "
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<< dwarf::AttributeString(Data[i].getAttribute())
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<< " "
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<< dwarf::FormEncodingString(Data[i].getForm())
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<< '\n';
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}
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}
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void DIEAbbrev::dump() { print(dbgs()); }
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#endif
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DIEAbbrev DIE::generateAbbrev() const {
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DIEAbbrev Abbrev(Tag, hasChildren());
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for (const DIEValue &V : values())
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Abbrev.AddAttribute(V.getAttribute(), V.getForm());
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return Abbrev;
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}
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/// Climb up the parent chain to get the unit DIE to which this DIE
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/// belongs.
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const DIE *DIE::getUnit() const {
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const DIE *Cu = getUnitOrNull();
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assert(Cu && "We should not have orphaned DIEs.");
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return Cu;
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}
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/// Climb up the parent chain to get the unit DIE this DIE belongs
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/// to. Return NULL if DIE is not added to an owner yet.
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const DIE *DIE::getUnitOrNull() const {
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const DIE *p = this;
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while (p) {
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if (p->getTag() == dwarf::DW_TAG_compile_unit ||
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p->getTag() == dwarf::DW_TAG_type_unit)
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return p;
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p = p->getParent();
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}
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return nullptr;
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}
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DIEValue DIE::findAttribute(dwarf::Attribute Attribute) const {
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// Iterate through all the attributes until we find the one we're
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// looking for, if we can't find it return NULL.
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for (const auto &V : values())
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if (V.getAttribute() == Attribute)
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return V;
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return DIEValue();
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}
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#ifndef NDEBUG
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static void printValues(raw_ostream &O, const DIEValueList &Values,
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StringRef Type, unsigned Size, unsigned IndentCount) {
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O << Type << ": Size: " << Size << "\n";
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unsigned I = 0;
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const std::string Indent(IndentCount, ' ');
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for (const auto &V : Values.values()) {
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O << Indent;
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O << "Blk[" << I++ << "]";
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O << " " << dwarf::FormEncodingString(V.getForm()) << " ";
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V.print(O);
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O << "\n";
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}
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}
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void DIE::print(raw_ostream &O, unsigned IndentCount) const {
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const std::string Indent(IndentCount, ' ');
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O << Indent << "Die: " << format("0x%lx", (long)(intptr_t) this)
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<< ", Offset: " << Offset << ", Size: " << Size << "\n";
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O << Indent << dwarf::TagString(getTag()) << " "
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<< dwarf::ChildrenString(hasChildren()) << "\n";
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IndentCount += 2;
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for (const auto &V : values()) {
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O << Indent;
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O << dwarf::AttributeString(V.getAttribute());
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O << " " << dwarf::FormEncodingString(V.getForm()) << " ";
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V.print(O);
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O << "\n";
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}
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IndentCount -= 2;
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for (const auto &Child : children())
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Child.print(O, IndentCount + 4);
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O << "\n";
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}
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void DIE::dump() {
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print(dbgs());
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}
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#endif
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void DIEValue::EmitValue(const AsmPrinter *AP) const {
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switch (Ty) {
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case isNone:
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llvm_unreachable("Expected valid DIEValue");
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#define HANDLE_DIEVALUE(T) \
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case is##T: \
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getDIE##T().EmitValue(AP, Form); \
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break;
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#include "llvm/CodeGen/DIEValue.def"
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}
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}
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unsigned DIEValue::SizeOf(const AsmPrinter *AP) const {
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switch (Ty) {
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case isNone:
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llvm_unreachable("Expected valid DIEValue");
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#define HANDLE_DIEVALUE(T) \
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case is##T: \
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return getDIE##T().SizeOf(AP, Form);
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#include "llvm/CodeGen/DIEValue.def"
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}
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llvm_unreachable("Unknown DIE kind");
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}
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#ifndef NDEBUG
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void DIEValue::print(raw_ostream &O) const {
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switch (Ty) {
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case isNone:
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llvm_unreachable("Expected valid DIEValue");
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#define HANDLE_DIEVALUE(T) \
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case is##T: \
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getDIE##T().print(O); \
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break;
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#include "llvm/CodeGen/DIEValue.def"
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}
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}
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void DIEValue::dump() const {
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print(dbgs());
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}
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#endif
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//===----------------------------------------------------------------------===//
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// DIEInteger Implementation
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//===----------------------------------------------------------------------===//
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/// EmitValue - Emit integer of appropriate size.
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///
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void DIEInteger::EmitValue(const AsmPrinter *Asm, dwarf::Form Form) const {
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unsigned Size = ~0U;
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switch (Form) {
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case dwarf::DW_FORM_flag_present:
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// Emit something to keep the lines and comments in sync.
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// FIXME: Is there a better way to do this?
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Asm->OutStreamer->AddBlankLine();
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return;
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case dwarf::DW_FORM_flag: // Fall thru
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case dwarf::DW_FORM_ref1: // Fall thru
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case dwarf::DW_FORM_data1: Size = 1; break;
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case dwarf::DW_FORM_ref2: // Fall thru
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case dwarf::DW_FORM_data2: Size = 2; break;
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case dwarf::DW_FORM_sec_offset: // Fall thru
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case dwarf::DW_FORM_strp: // Fall thru
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case dwarf::DW_FORM_ref4: // Fall thru
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case dwarf::DW_FORM_data4: Size = 4; break;
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case dwarf::DW_FORM_ref8: // Fall thru
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case dwarf::DW_FORM_ref_sig8: // Fall thru
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case dwarf::DW_FORM_data8: Size = 8; break;
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case dwarf::DW_FORM_GNU_str_index: Asm->EmitULEB128(Integer); return;
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case dwarf::DW_FORM_GNU_addr_index: Asm->EmitULEB128(Integer); return;
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case dwarf::DW_FORM_udata: Asm->EmitULEB128(Integer); return;
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case dwarf::DW_FORM_sdata: Asm->EmitSLEB128(Integer); return;
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case dwarf::DW_FORM_addr:
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Size = Asm->getPointerSize();
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break;
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case dwarf::DW_FORM_ref_addr:
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Size = SizeOf(Asm, dwarf::DW_FORM_ref_addr);
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break;
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default: llvm_unreachable("DIE Value form not supported yet");
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}
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Asm->OutStreamer->EmitIntValue(Integer, Size);
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}
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/// SizeOf - Determine size of integer value in bytes.
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///
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unsigned DIEInteger::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
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switch (Form) {
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case dwarf::DW_FORM_flag_present: return 0;
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case dwarf::DW_FORM_flag: // Fall thru
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case dwarf::DW_FORM_ref1: // Fall thru
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case dwarf::DW_FORM_data1: return sizeof(int8_t);
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case dwarf::DW_FORM_ref2: // Fall thru
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case dwarf::DW_FORM_data2: return sizeof(int16_t);
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case dwarf::DW_FORM_sec_offset: // Fall thru
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case dwarf::DW_FORM_strp: // Fall thru
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case dwarf::DW_FORM_ref4: // Fall thru
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case dwarf::DW_FORM_data4: return sizeof(int32_t);
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case dwarf::DW_FORM_ref8: // Fall thru
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case dwarf::DW_FORM_ref_sig8: // Fall thru
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case dwarf::DW_FORM_data8: return sizeof(int64_t);
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case dwarf::DW_FORM_GNU_str_index: return getULEB128Size(Integer);
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case dwarf::DW_FORM_GNU_addr_index: return getULEB128Size(Integer);
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case dwarf::DW_FORM_udata: return getULEB128Size(Integer);
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case dwarf::DW_FORM_sdata: return getSLEB128Size(Integer);
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case dwarf::DW_FORM_addr:
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return AP->getPointerSize();
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case dwarf::DW_FORM_ref_addr:
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if (AP->OutStreamer->getContext().getDwarfVersion() == 2)
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return AP->getPointerSize();
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return sizeof(int32_t);
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default: llvm_unreachable("DIE Value form not supported yet");
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}
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}
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#ifndef NDEBUG
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void DIEInteger::print(raw_ostream &O) const {
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O << "Int: " << (int64_t)Integer << " 0x";
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O.write_hex(Integer);
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}
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#endif
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//===----------------------------------------------------------------------===//
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// DIEExpr Implementation
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//===----------------------------------------------------------------------===//
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/// EmitValue - Emit expression value.
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///
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void DIEExpr::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
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AP->OutStreamer->EmitValue(Expr, SizeOf(AP, Form));
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}
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/// SizeOf - Determine size of expression value in bytes.
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///
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unsigned DIEExpr::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
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if (Form == dwarf::DW_FORM_data4) return 4;
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if (Form == dwarf::DW_FORM_sec_offset) return 4;
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if (Form == dwarf::DW_FORM_strp) return 4;
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return AP->getPointerSize();
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}
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#ifndef NDEBUG
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void DIEExpr::print(raw_ostream &O) const { O << "Expr: " << *Expr; }
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#endif
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//===----------------------------------------------------------------------===//
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// DIELabel Implementation
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//===----------------------------------------------------------------------===//
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/// EmitValue - Emit label value.
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///
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void DIELabel::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
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AP->EmitLabelReference(Label, SizeOf(AP, Form),
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Form == dwarf::DW_FORM_strp ||
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Form == dwarf::DW_FORM_sec_offset ||
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Form == dwarf::DW_FORM_ref_addr);
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}
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/// SizeOf - Determine size of label value in bytes.
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///
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unsigned DIELabel::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
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if (Form == dwarf::DW_FORM_data4) return 4;
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if (Form == dwarf::DW_FORM_sec_offset) return 4;
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if (Form == dwarf::DW_FORM_strp) return 4;
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return AP->getPointerSize();
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}
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#ifndef NDEBUG
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void DIELabel::print(raw_ostream &O) const { O << "Lbl: " << Label->getName(); }
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#endif
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//===----------------------------------------------------------------------===//
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// DIEDelta Implementation
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//===----------------------------------------------------------------------===//
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/// EmitValue - Emit delta value.
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///
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void DIEDelta::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
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AP->EmitLabelDifference(LabelHi, LabelLo, SizeOf(AP, Form));
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}
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/// SizeOf - Determine size of delta value in bytes.
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///
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unsigned DIEDelta::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
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if (Form == dwarf::DW_FORM_data4) return 4;
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if (Form == dwarf::DW_FORM_sec_offset) return 4;
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if (Form == dwarf::DW_FORM_strp) return 4;
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return AP->getPointerSize();
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}
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#ifndef NDEBUG
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void DIEDelta::print(raw_ostream &O) const {
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O << "Del: " << LabelHi->getName() << "-" << LabelLo->getName();
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}
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#endif
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//===----------------------------------------------------------------------===//
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// DIEString Implementation
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//===----------------------------------------------------------------------===//
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/// EmitValue - Emit string value.
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///
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void DIEString::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
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assert(
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(Form == dwarf::DW_FORM_strp || Form == dwarf::DW_FORM_GNU_str_index) &&
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"Expected valid string form");
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// Index of string in symbol table.
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if (Form == dwarf::DW_FORM_GNU_str_index) {
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DIEInteger(S.getIndex()).EmitValue(AP, Form);
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return;
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}
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// Relocatable symbol.
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assert(Form == dwarf::DW_FORM_strp);
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if (AP->MAI->doesDwarfUseRelocationsAcrossSections()) {
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DIELabel(S.getSymbol()).EmitValue(AP, Form);
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return;
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}
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// Offset into symbol table.
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DIEInteger(S.getOffset()).EmitValue(AP, Form);
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}
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/// SizeOf - Determine size of delta value in bytes.
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///
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unsigned DIEString::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
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assert(
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(Form == dwarf::DW_FORM_strp || Form == dwarf::DW_FORM_GNU_str_index) &&
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"Expected valid string form");
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// Index of string in symbol table.
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if (Form == dwarf::DW_FORM_GNU_str_index)
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return DIEInteger(S.getIndex()).SizeOf(AP, Form);
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// Relocatable symbol.
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if (AP->MAI->doesDwarfUseRelocationsAcrossSections())
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return DIELabel(S.getSymbol()).SizeOf(AP, Form);
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// Offset into symbol table.
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return DIEInteger(S.getOffset()).SizeOf(AP, Form);
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}
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#ifndef NDEBUG
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void DIEString::print(raw_ostream &O) const {
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O << "String: " << S.getString();
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}
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#endif
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//===----------------------------------------------------------------------===//
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// DIEEntry Implementation
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//===----------------------------------------------------------------------===//
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/// EmitValue - Emit debug information entry offset.
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///
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void DIEEntry::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
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if (Form == dwarf::DW_FORM_ref_addr) {
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const DwarfDebug *DD = AP->getDwarfDebug();
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unsigned Addr = Entry->getOffset();
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assert(!DD->useSplitDwarf() && "TODO: dwo files can't have relocations.");
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// For DW_FORM_ref_addr, output the offset from beginning of debug info
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// section. Entry->getOffset() returns the offset from start of the
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// compile unit.
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DwarfCompileUnit *CU = DD->lookupUnit(Entry->getUnit());
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assert(CU && "CUDie should belong to a CU.");
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Addr += CU->getDebugInfoOffset();
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if (AP->MAI->doesDwarfUseRelocationsAcrossSections())
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AP->EmitLabelPlusOffset(CU->getSectionSym(), Addr,
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DIEEntry::getRefAddrSize(AP));
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else
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AP->OutStreamer->EmitIntValue(Addr, DIEEntry::getRefAddrSize(AP));
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} else
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AP->EmitInt32(Entry->getOffset());
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}
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unsigned DIEEntry::getRefAddrSize(const AsmPrinter *AP) {
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// DWARF4: References that use the attribute form DW_FORM_ref_addr are
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// specified to be four bytes in the DWARF 32-bit format and eight bytes
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// in the DWARF 64-bit format, while DWARF Version 2 specifies that such
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// references have the same size as an address on the target system.
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const DwarfDebug *DD = AP->getDwarfDebug();
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assert(DD && "Expected Dwarf Debug info to be available");
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if (DD->getDwarfVersion() == 2)
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return AP->getPointerSize();
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return sizeof(int32_t);
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}
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#ifndef NDEBUG
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void DIEEntry::print(raw_ostream &O) const {
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O << format("Die: 0x%lx", (long)(intptr_t)&Entry);
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}
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#endif
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//===----------------------------------------------------------------------===//
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// DIETypeSignature Implementation
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//===----------------------------------------------------------------------===//
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void DIETypeSignature::EmitValue(const AsmPrinter *Asm,
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dwarf::Form Form) const {
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assert(Form == dwarf::DW_FORM_ref_sig8);
|
|
Asm->OutStreamer->EmitIntValue(Unit->getTypeSignature(), 8);
|
|
}
|
|
|
|
#ifndef NDEBUG
|
|
void DIETypeSignature::print(raw_ostream &O) const {
|
|
O << format("Type Unit: 0x%lx", Unit->getTypeSignature());
|
|
}
|
|
#endif
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// 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");
|
|
}
|
|
}
|
|
|
|
#ifndef NDEBUG
|
|
void DIELoc::print(raw_ostream &O) const {
|
|
printValues(O, *this, "ExprLoc", Size, 5);
|
|
}
|
|
#endif
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// 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");
|
|
}
|
|
}
|
|
|
|
#ifndef NDEBUG
|
|
void DIEBlock::print(raw_ostream &O) const {
|
|
printValues(O, *this, "Blk", Size, 5);
|
|
}
|
|
#endif
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// 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());
|
|
}
|
|
|
|
#ifndef NDEBUG
|
|
void DIELocList::print(raw_ostream &O) const { O << "LocList: " << Index; }
|
|
#endif
|