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396ba8b495
This partially reverts r185202 and restores DIELabel to hold plain MCSymbol references. Instead, we add a new subclass DIEExpr of DIEValue that can hold generic MCExpr references. This is in preparation for supporting debug info for TLS variables on PowerPC, where we need to describe the variable location using a more complex expression than just MCSymbolRefExpr. llvm-svn: 185458
390 lines
12 KiB
C++
390 lines
12 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 "DIE.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/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/Allocator.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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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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ID.AddInteger(Attribute);
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ID.AddInteger(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(Tag);
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ID.AddInteger(ChildrenFlag);
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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(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(ChildrenFlag, dwarf::ChildrenString(ChildrenFlag));
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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(ChildrenFlag)
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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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//===----------------------------------------------------------------------===//
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// DIE Implementation
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//===----------------------------------------------------------------------===//
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DIE::~DIE() {
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for (unsigned i = 0, N = Children.size(); i < N; ++i)
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delete Children[i];
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}
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/// Climb up the parent chain to get the compile unit DIE to which this DIE
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/// belongs.
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DIE *DIE::getCompileUnit() {
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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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return p;
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p = p->getParent();
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}
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llvm_unreachable("We should not have orphaned DIEs.");
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}
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#ifndef NDEBUG
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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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bool isBlock = Abbrev.getTag() == 0;
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if (!isBlock) {
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O << Indent
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<< "Die: "
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<< format("0x%lx", (long)(intptr_t)this)
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<< ", Offset: " << Offset
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<< ", Size: " << Size << "\n";
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O << Indent
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<< dwarf::TagString(Abbrev.getTag())
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<< " "
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<< dwarf::ChildrenString(Abbrev.getChildrenFlag()) << "\n";
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} else {
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O << "Size: " << Size << "\n";
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}
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const SmallVectorImpl<DIEAbbrevData> &Data = Abbrev.getData();
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IndentCount += 2;
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for (unsigned i = 0, N = Data.size(); i < N; ++i) {
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O << Indent;
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if (!isBlock)
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O << dwarf::AttributeString(Data[i].getAttribute());
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else
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O << "Blk[" << i << "]";
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O << " "
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<< dwarf::FormEncodingString(Data[i].getForm())
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<< " ";
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Values[i]->print(O);
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O << "\n";
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}
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IndentCount -= 2;
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for (unsigned j = 0, M = Children.size(); j < M; ++j) {
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Children[j]->print(O, IndentCount+4);
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}
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if (!isBlock) 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::anchor() { }
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#ifndef NDEBUG
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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(AsmPrinter *Asm, unsigned 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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if (Asm->OutStreamer.hasRawTextSupport())
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Asm->OutStreamer.EmitRawText(StringRef(""));
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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_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_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->getDataLayout().getPointerSize(); 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(AsmPrinter *AP, unsigned 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_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_data8: return sizeof(int64_t);
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case dwarf::DW_FORM_GNU_str_index: return MCAsmInfo::getULEB128Size(Integer);
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case dwarf::DW_FORM_GNU_addr_index: return MCAsmInfo::getULEB128Size(Integer);
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case dwarf::DW_FORM_udata: return MCAsmInfo::getULEB128Size(Integer);
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case dwarf::DW_FORM_sdata: return MCAsmInfo::getSLEB128Size(Integer);
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case dwarf::DW_FORM_addr: return AP->getDataLayout().getPointerSize();
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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(AsmPrinter *AP, unsigned 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(AsmPrinter *AP, unsigned 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->getDataLayout().getPointerSize();
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}
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#ifndef NDEBUG
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void DIEExpr::print(raw_ostream &O) const {
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O << "Expr: ";
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Expr->print(O);
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}
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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(AsmPrinter *AP, unsigned Form) const {
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AP->EmitLabelReference(Label, SizeOf(AP, Form));
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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(AsmPrinter *AP, unsigned 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->getDataLayout().getPointerSize();
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}
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#ifndef NDEBUG
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void DIELabel::print(raw_ostream &O) const {
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O << "Lbl: " << Label->getName();
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}
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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(AsmPrinter *AP, unsigned 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(AsmPrinter *AP, unsigned Form) const {
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if (Form == dwarf::DW_FORM_data4) return 4;
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if (Form == dwarf::DW_FORM_strp) return 4;
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return AP->getDataLayout().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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// 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(AsmPrinter *AP, unsigned Form) const {
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AP->EmitInt32(Entry->getOffset());
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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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// DIEBlock Implementation
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//===----------------------------------------------------------------------===//
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/// ComputeSize - calculate the size of the block.
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///
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unsigned DIEBlock::ComputeSize(AsmPrinter *AP) {
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if (!Size) {
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const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
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for (unsigned i = 0, N = Values.size(); i < N; ++i)
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Size += Values[i]->SizeOf(AP, AbbrevData[i].getForm());
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}
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return Size;
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}
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/// EmitValue - Emit block data.
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///
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void DIEBlock::EmitValue(AsmPrinter *Asm, unsigned Form) const {
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switch (Form) {
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default: llvm_unreachable("Improper form for block");
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case dwarf::DW_FORM_block1: Asm->EmitInt8(Size); break;
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case dwarf::DW_FORM_block2: Asm->EmitInt16(Size); break;
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case dwarf::DW_FORM_block4: Asm->EmitInt32(Size); break;
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case dwarf::DW_FORM_block: Asm->EmitULEB128(Size); break;
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}
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const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
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for (unsigned i = 0, N = Values.size(); i < N; ++i)
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Values[i]->EmitValue(Asm, AbbrevData[i].getForm());
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}
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/// SizeOf - Determine size of block data in bytes.
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///
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unsigned DIEBlock::SizeOf(AsmPrinter *AP, unsigned Form) const {
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switch (Form) {
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case dwarf::DW_FORM_block1: return Size + sizeof(int8_t);
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case dwarf::DW_FORM_block2: return Size + sizeof(int16_t);
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case dwarf::DW_FORM_block4: return Size + sizeof(int32_t);
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case dwarf::DW_FORM_block: return Size + MCAsmInfo::getULEB128Size(Size);
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default: llvm_unreachable("Improper form for block");
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}
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}
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#ifndef NDEBUG
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void DIEBlock::print(raw_ostream &O) const {
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O << "Blk: ";
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DIE::print(O, 5);
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}
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#endif
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