forked from OSchip/llvm-project
2117 lines
80 KiB
C++
2117 lines
80 KiB
C++
//===-- llvm/CodeGen/DwarfUnit.cpp - Dwarf Type and Compile Units ---------===//
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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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// This file contains support for constructing a dwarf compile unit.
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//
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//===----------------------------------------------------------------------===//
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#include "DwarfUnit.h"
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#include "DwarfAccelTable.h"
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#include "DwarfDebug.h"
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#include "llvm/ADT/APFloat.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DIBuilder.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/Mangler.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/MCSection.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Target/TargetFrameLowering.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "llvm/Target/TargetSubtargetInfo.h"
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using namespace llvm;
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#define DEBUG_TYPE "dwarfdebug"
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static cl::opt<bool>
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GenerateDwarfTypeUnits("generate-type-units", cl::Hidden,
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cl::desc("Generate DWARF4 type units."),
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cl::init(false));
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/// Unit - Unit constructor.
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DwarfUnit::DwarfUnit(unsigned UID, dwarf::Tag UnitTag, DICompileUnit Node,
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AsmPrinter *A, DwarfDebug *DW, DwarfFile *DWU)
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: UniqueID(UID), CUNode(Node), UnitDie(UnitTag), DebugInfoOffset(0), Asm(A),
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DD(DW), DU(DWU), IndexTyDie(nullptr), Section(nullptr),
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Skeleton(nullptr) {
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assert(UnitTag == dwarf::DW_TAG_compile_unit ||
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UnitTag == dwarf::DW_TAG_type_unit);
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DIEIntegerOne = new (DIEValueAllocator) DIEInteger(1);
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}
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DwarfCompileUnit::DwarfCompileUnit(unsigned UID, DICompileUnit Node,
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AsmPrinter *A, DwarfDebug *DW,
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DwarfFile *DWU)
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: DwarfUnit(UID, dwarf::DW_TAG_compile_unit, Node, A, DW, DWU) {
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insertDIE(Node, &getUnitDie());
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}
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DwarfTypeUnit::DwarfTypeUnit(unsigned UID, DwarfCompileUnit &CU, AsmPrinter *A,
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DwarfDebug *DW, DwarfFile *DWU,
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MCDwarfDwoLineTable *SplitLineTable)
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: DwarfUnit(UID, dwarf::DW_TAG_type_unit, CU.getCUNode(), A, DW, DWU),
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CU(CU), SplitLineTable(SplitLineTable) {
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if (SplitLineTable)
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addSectionOffset(UnitDie, dwarf::DW_AT_stmt_list, 0);
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}
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/// ~Unit - Destructor for compile unit.
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DwarfUnit::~DwarfUnit() {
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for (unsigned j = 0, M = DIEBlocks.size(); j < M; ++j)
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DIEBlocks[j]->~DIEBlock();
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for (unsigned j = 0, M = DIELocs.size(); j < M; ++j)
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DIELocs[j]->~DIELoc();
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}
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/// createDIEEntry - Creates a new DIEEntry to be a proxy for a debug
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/// information entry.
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DIEEntry *DwarfUnit::createDIEEntry(DIE &Entry) {
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DIEEntry *Value = new (DIEValueAllocator) DIEEntry(Entry);
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return Value;
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}
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/// getDefaultLowerBound - Return the default lower bound for an array. If the
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/// DWARF version doesn't handle the language, return -1.
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int64_t DwarfUnit::getDefaultLowerBound() const {
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switch (getLanguage()) {
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default:
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break;
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case dwarf::DW_LANG_C89:
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case dwarf::DW_LANG_C99:
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case dwarf::DW_LANG_C:
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case dwarf::DW_LANG_C_plus_plus:
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case dwarf::DW_LANG_ObjC:
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case dwarf::DW_LANG_ObjC_plus_plus:
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return 0;
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case dwarf::DW_LANG_Fortran77:
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case dwarf::DW_LANG_Fortran90:
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case dwarf::DW_LANG_Fortran95:
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return 1;
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// The languages below have valid values only if the DWARF version >= 4.
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case dwarf::DW_LANG_Java:
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case dwarf::DW_LANG_Python:
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case dwarf::DW_LANG_UPC:
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case dwarf::DW_LANG_D:
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if (dwarf::DWARF_VERSION >= 4)
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return 0;
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break;
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case dwarf::DW_LANG_Ada83:
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case dwarf::DW_LANG_Ada95:
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case dwarf::DW_LANG_Cobol74:
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case dwarf::DW_LANG_Cobol85:
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case dwarf::DW_LANG_Modula2:
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case dwarf::DW_LANG_Pascal83:
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case dwarf::DW_LANG_PLI:
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if (dwarf::DWARF_VERSION >= 4)
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return 1;
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break;
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}
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return -1;
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}
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/// Check whether the DIE for this MDNode can be shared across CUs.
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static bool isShareableAcrossCUs(DIDescriptor D) {
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// When the MDNode can be part of the type system, the DIE can be shared
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// across CUs.
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// Combining type units and cross-CU DIE sharing is lower value (since
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// cross-CU DIE sharing is used in LTO and removes type redundancy at that
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// level already) but may be implementable for some value in projects
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// building multiple independent libraries with LTO and then linking those
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// together.
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return (D.isType() ||
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(D.isSubprogram() && !DISubprogram(D).isDefinition())) &&
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!GenerateDwarfTypeUnits;
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}
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/// getDIE - Returns the debug information entry map slot for the
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/// specified debug variable. We delegate the request to DwarfDebug
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/// when the DIE for this MDNode can be shared across CUs. The mappings
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/// will be kept in DwarfDebug for shareable DIEs.
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DIE *DwarfUnit::getDIE(DIDescriptor D) const {
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if (isShareableAcrossCUs(D))
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return DD->getDIE(D);
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return MDNodeToDieMap.lookup(D);
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}
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/// insertDIE - Insert DIE into the map. We delegate the request to DwarfDebug
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/// when the DIE for this MDNode can be shared across CUs. The mappings
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/// will be kept in DwarfDebug for shareable DIEs.
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void DwarfUnit::insertDIE(DIDescriptor Desc, DIE *D) {
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if (isShareableAcrossCUs(Desc)) {
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DD->insertDIE(Desc, D);
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return;
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}
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MDNodeToDieMap.insert(std::make_pair(Desc, D));
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}
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/// addFlag - Add a flag that is true.
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void DwarfUnit::addFlag(DIE &Die, dwarf::Attribute Attribute) {
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if (DD->getDwarfVersion() >= 4)
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Die.addValue(Attribute, dwarf::DW_FORM_flag_present, DIEIntegerOne);
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else
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Die.addValue(Attribute, dwarf::DW_FORM_flag, DIEIntegerOne);
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}
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/// addUInt - Add an unsigned integer attribute data and value.
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///
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void DwarfUnit::addUInt(DIE &Die, dwarf::Attribute Attribute,
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Optional<dwarf::Form> Form, uint64_t Integer) {
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if (!Form)
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Form = DIEInteger::BestForm(false, Integer);
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DIEValue *Value = Integer == 1 ? DIEIntegerOne : new (DIEValueAllocator)
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DIEInteger(Integer);
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Die.addValue(Attribute, *Form, Value);
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}
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void DwarfUnit::addUInt(DIE &Block, dwarf::Form Form, uint64_t Integer) {
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addUInt(Block, (dwarf::Attribute)0, Form, Integer);
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}
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/// addSInt - Add an signed integer attribute data and value.
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///
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void DwarfUnit::addSInt(DIE &Die, dwarf::Attribute Attribute,
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Optional<dwarf::Form> Form, int64_t Integer) {
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if (!Form)
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Form = DIEInteger::BestForm(true, Integer);
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DIEValue *Value = new (DIEValueAllocator) DIEInteger(Integer);
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Die.addValue(Attribute, *Form, Value);
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}
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void DwarfUnit::addSInt(DIELoc &Die, Optional<dwarf::Form> Form,
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int64_t Integer) {
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addSInt(Die, (dwarf::Attribute)0, Form, Integer);
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}
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/// addString - Add a string attribute data and value. We always emit a
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/// reference to the string pool instead of immediate strings so that DIEs have
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/// more predictable sizes. In the case of split dwarf we emit an index
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/// into another table which gets us the static offset into the string
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/// table.
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void DwarfUnit::addString(DIE &Die, dwarf::Attribute Attribute,
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StringRef String) {
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if (!DD->useSplitDwarf())
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return addLocalString(Die, Attribute, String);
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unsigned idx = DU->getStringPool().getIndex(*Asm, String);
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DIEValue *Value = new (DIEValueAllocator) DIEInteger(idx);
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DIEValue *Str = new (DIEValueAllocator) DIEString(Value, String);
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Die.addValue(Attribute, dwarf::DW_FORM_GNU_str_index, Str);
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}
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/// addLocalString - Add a string attribute data and value. This is guaranteed
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/// to be in the local string pool instead of indirected.
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void DwarfUnit::addLocalString(DIE &Die, dwarf::Attribute Attribute,
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StringRef String) {
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MCSymbol *Symb = DU->getStringPool().getSymbol(*Asm, String);
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DIEValue *Value;
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if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
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Value = new (DIEValueAllocator) DIELabel(Symb);
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else
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Value = new (DIEValueAllocator) DIEDelta(Symb, DD->getDebugStrSym());
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DIEValue *Str = new (DIEValueAllocator) DIEString(Value, String);
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Die.addValue(Attribute, dwarf::DW_FORM_strp, Str);
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}
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/// addExpr - Add a Dwarf expression attribute data and value.
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///
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void DwarfUnit::addExpr(DIELoc &Die, dwarf::Form Form, const MCExpr *Expr) {
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DIEValue *Value = new (DIEValueAllocator) DIEExpr(Expr);
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Die.addValue((dwarf::Attribute)0, Form, Value);
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}
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/// addLocationList - Add a Dwarf loclistptr attribute data and value.
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///
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void DwarfUnit::addLocationList(DIE &Die, dwarf::Attribute Attribute,
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unsigned Index) {
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DIEValue *Value = new (DIEValueAllocator) DIELocList(Index);
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dwarf::Form Form = DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
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: dwarf::DW_FORM_data4;
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Die.addValue(Attribute, Form, Value);
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}
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/// addLabel - Add a Dwarf label attribute data and value.
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///
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void DwarfUnit::addLabel(DIE &Die, dwarf::Attribute Attribute, dwarf::Form Form,
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const MCSymbol *Label) {
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DIEValue *Value = new (DIEValueAllocator) DIELabel(Label);
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Die.addValue(Attribute, Form, Value);
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}
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void DwarfUnit::addLabel(DIELoc &Die, dwarf::Form Form, const MCSymbol *Label) {
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addLabel(Die, (dwarf::Attribute)0, Form, Label);
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}
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/// addSectionLabel - Add a Dwarf section label attribute data and value.
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///
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void DwarfUnit::addSectionLabel(DIE &Die, dwarf::Attribute Attribute,
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const MCSymbol *Label) {
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if (DD->getDwarfVersion() >= 4)
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addLabel(Die, Attribute, dwarf::DW_FORM_sec_offset, Label);
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else
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addLabel(Die, Attribute, dwarf::DW_FORM_data4, Label);
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}
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/// addSectionOffset - Add an offset into a section attribute data and value.
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///
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void DwarfUnit::addSectionOffset(DIE &Die, dwarf::Attribute Attribute,
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uint64_t Integer) {
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if (DD->getDwarfVersion() >= 4)
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addUInt(Die, Attribute, dwarf::DW_FORM_sec_offset, Integer);
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else
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addUInt(Die, Attribute, dwarf::DW_FORM_data4, Integer);
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}
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/// addLabelAddress - Add a dwarf label attribute data and value using
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/// DW_FORM_addr or DW_FORM_GNU_addr_index.
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///
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void DwarfCompileUnit::addLabelAddress(DIE &Die, dwarf::Attribute Attribute,
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const MCSymbol *Label) {
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// Don't use the address pool in non-fission or in the skeleton unit itself.
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// FIXME: Once GDB supports this, it's probably worthwhile using the address
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// pool from the skeleton - maybe even in non-fission (possibly fewer
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// relocations by sharing them in the pool, but we have other ideas about how
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// to reduce the number of relocations as well/instead).
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if (!DD->useSplitDwarf() || !Skeleton)
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return addLocalLabelAddress(Die, Attribute, Label);
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if (Label)
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DD->addArangeLabel(SymbolCU(this, Label));
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unsigned idx = DD->getAddressPool().getIndex(Label);
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DIEValue *Value = new (DIEValueAllocator) DIEInteger(idx);
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Die.addValue(Attribute, dwarf::DW_FORM_GNU_addr_index, Value);
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}
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void DwarfCompileUnit::addLocalLabelAddress(DIE &Die,
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dwarf::Attribute Attribute,
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const MCSymbol *Label) {
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if (Label)
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DD->addArangeLabel(SymbolCU(this, Label));
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Die.addValue(Attribute, dwarf::DW_FORM_addr,
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Label ? (DIEValue *)new (DIEValueAllocator) DIELabel(Label)
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: new (DIEValueAllocator) DIEInteger(0));
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}
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unsigned DwarfCompileUnit::getOrCreateSourceID(StringRef FileName, StringRef DirName) {
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// If we print assembly, we can't separate .file entries according to
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// compile units. Thus all files will belong to the default compile unit.
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// FIXME: add a better feature test than hasRawTextSupport. Even better,
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// extend .file to support this.
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return Asm->OutStreamer.EmitDwarfFileDirective(
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0, DirName, FileName,
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Asm->OutStreamer.hasRawTextSupport() ? 0 : getUniqueID());
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}
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unsigned DwarfTypeUnit::getOrCreateSourceID(StringRef FileName, StringRef DirName) {
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return SplitLineTable ? SplitLineTable->getFile(DirName, FileName)
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: getCU().getOrCreateSourceID(FileName, DirName);
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}
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/// addOpAddress - Add a dwarf op address data and value using the
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/// form given and an op of either DW_FORM_addr or DW_FORM_GNU_addr_index.
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///
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void DwarfUnit::addOpAddress(DIELoc &Die, const MCSymbol *Sym) {
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if (!DD->useSplitDwarf()) {
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addUInt(Die, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
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addLabel(Die, dwarf::DW_FORM_udata, Sym);
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} else {
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addUInt(Die, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_addr_index);
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addUInt(Die, dwarf::DW_FORM_GNU_addr_index,
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DD->getAddressPool().getIndex(Sym));
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}
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}
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/// addSectionDelta - Add a section label delta attribute data and value.
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///
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void DwarfUnit::addSectionDelta(DIE &Die, dwarf::Attribute Attribute,
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const MCSymbol *Hi, const MCSymbol *Lo) {
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DIEValue *Value = new (DIEValueAllocator) DIEDelta(Hi, Lo);
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Die.addValue(Attribute, DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
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: dwarf::DW_FORM_data4,
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Value);
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}
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void DwarfUnit::addLabelDelta(DIE &Die, dwarf::Attribute Attribute,
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const MCSymbol *Hi, const MCSymbol *Lo) {
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DIEValue *Value = new (DIEValueAllocator) DIEDelta(Hi, Lo);
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Die.addValue(Attribute, dwarf::DW_FORM_data4, Value);
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}
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/// addDIEEntry - Add a DIE attribute data and value.
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///
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void DwarfUnit::addDIEEntry(DIE &Die, dwarf::Attribute Attribute, DIE &Entry) {
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addDIEEntry(Die, Attribute, createDIEEntry(Entry));
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}
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void DwarfUnit::addDIETypeSignature(DIE &Die, const DwarfTypeUnit &Type) {
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// Flag the type unit reference as a declaration so that if it contains
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// members (implicit special members, static data member definitions, member
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// declarations for definitions in this CU, etc) consumers don't get confused
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// and think this is a full definition.
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addFlag(Die, dwarf::DW_AT_declaration);
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Die.addValue(dwarf::DW_AT_signature, dwarf::DW_FORM_ref_sig8,
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new (DIEValueAllocator) DIETypeSignature(Type));
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}
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void DwarfUnit::addDIEEntry(DIE &Die, dwarf::Attribute Attribute,
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DIEEntry *Entry) {
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const DIE *DieCU = Die.getUnitOrNull();
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const DIE *EntryCU = Entry->getEntry().getUnitOrNull();
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if (!DieCU)
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// We assume that Die belongs to this CU, if it is not linked to any CU yet.
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DieCU = &getUnitDie();
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if (!EntryCU)
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EntryCU = &getUnitDie();
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Die.addValue(Attribute,
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EntryCU == DieCU ? dwarf::DW_FORM_ref4 : dwarf::DW_FORM_ref_addr,
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Entry);
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}
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/// Create a DIE with the given Tag, add the DIE to its parent, and
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/// call insertDIE if MD is not null.
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DIE &DwarfUnit::createAndAddDIE(unsigned Tag, DIE &Parent, DIDescriptor N) {
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assert(Tag != dwarf::DW_TAG_auto_variable &&
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Tag != dwarf::DW_TAG_arg_variable);
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Parent.addChild(make_unique<DIE>((dwarf::Tag)Tag));
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DIE &Die = *Parent.getChildren().back();
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if (N)
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insertDIE(N, &Die);
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return Die;
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}
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/// addBlock - Add block data.
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///
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void DwarfUnit::addBlock(DIE &Die, dwarf::Attribute Attribute, DIELoc *Loc) {
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Loc->ComputeSize(Asm);
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DIELocs.push_back(Loc); // Memoize so we can call the destructor later on.
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Die.addValue(Attribute, Loc->BestForm(DD->getDwarfVersion()), Loc);
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}
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void DwarfUnit::addBlock(DIE &Die, dwarf::Attribute Attribute,
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DIEBlock *Block) {
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Block->ComputeSize(Asm);
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DIEBlocks.push_back(Block); // Memoize so we can call the destructor later on.
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Die.addValue(Attribute, Block->BestForm(), Block);
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}
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/// addSourceLine - Add location information to specified debug information
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/// entry.
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void DwarfUnit::addSourceLine(DIE &Die, unsigned Line, StringRef File,
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StringRef Directory) {
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if (Line == 0)
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return;
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unsigned FileID = getOrCreateSourceID(File, Directory);
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assert(FileID && "Invalid file id");
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addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
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addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
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}
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/// addSourceLine - Add location information to specified debug information
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/// entry.
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void DwarfUnit::addSourceLine(DIE &Die, DIVariable V) {
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assert(V.isVariable());
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addSourceLine(Die, V.getLineNumber(), V.getContext().getFilename(),
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V.getContext().getDirectory());
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}
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/// addSourceLine - Add location information to specified debug information
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/// entry.
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void DwarfUnit::addSourceLine(DIE &Die, DIGlobalVariable G) {
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assert(G.isGlobalVariable());
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addSourceLine(Die, G.getLineNumber(), G.getFilename(), G.getDirectory());
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}
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/// addSourceLine - Add location information to specified debug information
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/// entry.
|
|
void DwarfUnit::addSourceLine(DIE &Die, DISubprogram SP) {
|
|
assert(SP.isSubprogram());
|
|
|
|
addSourceLine(Die, SP.getLineNumber(), SP.getFilename(), SP.getDirectory());
|
|
}
|
|
|
|
/// addSourceLine - Add location information to specified debug information
|
|
/// entry.
|
|
void DwarfUnit::addSourceLine(DIE &Die, DIType Ty) {
|
|
assert(Ty.isType());
|
|
|
|
addSourceLine(Die, Ty.getLineNumber(), Ty.getFilename(), Ty.getDirectory());
|
|
}
|
|
|
|
/// addSourceLine - Add location information to specified debug information
|
|
/// entry.
|
|
void DwarfUnit::addSourceLine(DIE &Die, DIObjCProperty Ty) {
|
|
assert(Ty.isObjCProperty());
|
|
|
|
DIFile File = Ty.getFile();
|
|
addSourceLine(Die, Ty.getLineNumber(), File.getFilename(),
|
|
File.getDirectory());
|
|
}
|
|
|
|
/// addSourceLine - Add location information to specified debug information
|
|
/// entry.
|
|
void DwarfUnit::addSourceLine(DIE &Die, DINameSpace NS) {
|
|
assert(NS.Verify());
|
|
|
|
addSourceLine(Die, NS.getLineNumber(), NS.getFilename(), NS.getDirectory());
|
|
}
|
|
|
|
/// addVariableAddress - Add DW_AT_location attribute for a
|
|
/// DbgVariable based on provided MachineLocation.
|
|
void DwarfUnit::addVariableAddress(const DbgVariable &DV, DIE &Die,
|
|
MachineLocation Location) {
|
|
if (DV.variableHasComplexAddress())
|
|
addComplexAddress(DV, Die, dwarf::DW_AT_location, Location);
|
|
else if (DV.isBlockByrefVariable())
|
|
addBlockByrefAddress(DV, Die, dwarf::DW_AT_location, Location);
|
|
else
|
|
addAddress(Die, dwarf::DW_AT_location, Location,
|
|
DV.getVariable().isIndirect());
|
|
}
|
|
|
|
/// addRegisterOp - Add register operand.
|
|
// FIXME: Ideally, this would share the implementation with
|
|
// AsmPrinter::EmitDwarfRegOpPiece.
|
|
void DwarfUnit::addRegisterOpPiece(DIELoc &TheDie, unsigned Reg,
|
|
unsigned SizeInBits, unsigned OffsetInBits) {
|
|
const TargetRegisterInfo *RI = Asm->TM.getSubtargetImpl()->getRegisterInfo();
|
|
int DWReg = RI->getDwarfRegNum(Reg, false);
|
|
bool isSubRegister = DWReg < 0;
|
|
|
|
unsigned Idx = 0;
|
|
|
|
// Go up the super-register chain until we hit a valid dwarf register number.
|
|
for (MCSuperRegIterator SR(Reg, RI); SR.isValid() && DWReg < 0; ++SR) {
|
|
DWReg = RI->getDwarfRegNum(*SR, false);
|
|
if (DWReg >= 0)
|
|
Idx = RI->getSubRegIndex(*SR, Reg);
|
|
}
|
|
|
|
if (DWReg < 0) {
|
|
DEBUG(dbgs() << "Invalid Dwarf register number.\n");
|
|
addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_nop);
|
|
return;
|
|
}
|
|
|
|
// Emit register.
|
|
if (DWReg < 32)
|
|
addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_reg0 + DWReg);
|
|
else {
|
|
addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_regx);
|
|
addUInt(TheDie, dwarf::DW_FORM_udata, DWReg);
|
|
}
|
|
|
|
// Emit mask.
|
|
bool isPiece = SizeInBits > 0;
|
|
if (isSubRegister || isPiece) {
|
|
const unsigned SizeOfByte = 8;
|
|
unsigned RegSizeInBits = RI->getSubRegIdxSize(Idx);
|
|
unsigned RegOffsetInBits = RI->getSubRegIdxOffset(Idx);
|
|
unsigned PieceSizeInBits = std::max(SizeInBits, RegSizeInBits);
|
|
unsigned PieceOffsetInBits = OffsetInBits ? OffsetInBits : RegOffsetInBits;
|
|
assert(RegSizeInBits >= SizeInBits && "register smaller than value");
|
|
|
|
if (RegOffsetInBits != PieceOffsetInBits) {
|
|
// Manually shift the value into place, since the DW_OP_piece
|
|
// describes the part of the variable, not the position of the
|
|
// subregister.
|
|
addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
|
|
addUInt(TheDie, dwarf::DW_FORM_data1, RegOffsetInBits);
|
|
addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_shr);
|
|
}
|
|
|
|
if (PieceOffsetInBits > 0 || PieceSizeInBits % SizeOfByte) {
|
|
assert(PieceSizeInBits > 0 && "piece has zero size");
|
|
addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_bit_piece);
|
|
addUInt(TheDie, dwarf::DW_FORM_data1, PieceSizeInBits);
|
|
addUInt(TheDie, dwarf::DW_FORM_data1, PieceOffsetInBits);
|
|
} else {
|
|
assert(PieceSizeInBits > 0 && "piece has zero size");
|
|
addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_piece);
|
|
addUInt(TheDie, dwarf::DW_FORM_data1, PieceSizeInBits/SizeOfByte);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// addRegisterOffset - Add register offset.
|
|
void DwarfUnit::addRegisterOffset(DIELoc &TheDie, unsigned Reg,
|
|
int64_t Offset) {
|
|
const TargetRegisterInfo *RI = Asm->TM.getSubtargetImpl()->getRegisterInfo();
|
|
unsigned DWReg = RI->getDwarfRegNum(Reg, false);
|
|
const TargetRegisterInfo *TRI = Asm->TM.getSubtargetImpl()->getRegisterInfo();
|
|
if (Reg == TRI->getFrameRegister(*Asm->MF))
|
|
// If variable offset is based in frame register then use fbreg.
|
|
addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_fbreg);
|
|
else if (DWReg < 32)
|
|
addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + DWReg);
|
|
else {
|
|
addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_bregx);
|
|
addUInt(TheDie, dwarf::DW_FORM_udata, DWReg);
|
|
}
|
|
addSInt(TheDie, dwarf::DW_FORM_sdata, Offset);
|
|
}
|
|
|
|
/// addAddress - Add an address attribute to a die based on the location
|
|
/// provided.
|
|
void DwarfUnit::addAddress(DIE &Die, dwarf::Attribute Attribute,
|
|
const MachineLocation &Location, bool Indirect) {
|
|
DIELoc *Loc = new (DIEValueAllocator) DIELoc();
|
|
|
|
if (Location.isReg() && !Indirect)
|
|
addRegisterOpPiece(*Loc, Location.getReg());
|
|
else {
|
|
addRegisterOffset(*Loc, Location.getReg(), Location.getOffset());
|
|
if (Indirect && !Location.isReg()) {
|
|
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
|
|
}
|
|
}
|
|
|
|
// Now attach the location information to the DIE.
|
|
addBlock(Die, Attribute, Loc);
|
|
}
|
|
|
|
/// addComplexAddress - Start with the address based on the location provided,
|
|
/// and generate the DWARF information necessary to find the actual variable
|
|
/// given the extra address information encoded in the DbgVariable, starting
|
|
/// from the starting location. Add the DWARF information to the die.
|
|
///
|
|
void DwarfUnit::addComplexAddress(const DbgVariable &DV, DIE &Die,
|
|
dwarf::Attribute Attribute,
|
|
const MachineLocation &Location) {
|
|
DIELoc *Loc = new (DIEValueAllocator) DIELoc();
|
|
unsigned N = DV.getNumAddrElements();
|
|
unsigned i = 0;
|
|
if (Location.isReg()) {
|
|
if (N >= 2 && DV.getAddrElement(0) == dwarf::DW_OP_plus) {
|
|
assert(!DV.getVariable().isIndirect() &&
|
|
"double indirection not handled");
|
|
// If first address element is OpPlus then emit
|
|
// DW_OP_breg + Offset instead of DW_OP_reg + Offset.
|
|
addRegisterOffset(*Loc, Location.getReg(), DV.getAddrElement(1));
|
|
i = 2;
|
|
} else if (N >= 2 && DV.getAddrElement(0) == dwarf::DW_OP_deref) {
|
|
assert(!DV.getVariable().isIndirect() &&
|
|
"double indirection not handled");
|
|
addRegisterOpPiece(*Loc, Location.getReg(),
|
|
DV.getExpression().getPieceSize(),
|
|
DV.getExpression().getPieceOffset());
|
|
i = 3;
|
|
} else
|
|
addRegisterOpPiece(*Loc, Location.getReg());
|
|
} else
|
|
addRegisterOffset(*Loc, Location.getReg(), Location.getOffset());
|
|
|
|
for (; i < N; ++i) {
|
|
uint64_t Element = DV.getAddrElement(i);
|
|
if (Element == dwarf::DW_OP_plus) {
|
|
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
|
|
addUInt(*Loc, dwarf::DW_FORM_udata, DV.getAddrElement(++i));
|
|
|
|
} else if (Element == dwarf::DW_OP_deref) {
|
|
if (!Location.isReg())
|
|
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
|
|
|
|
} else if (Element == dwarf::DW_OP_piece) {
|
|
const unsigned SizeOfByte = 8;
|
|
unsigned PieceOffsetInBits = DV.getAddrElement(++i)*SizeOfByte;
|
|
unsigned PieceSizeInBits = DV.getAddrElement(++i)*SizeOfByte;
|
|
// Emit DW_OP_bit_piece Size Offset.
|
|
assert(PieceSizeInBits > 0 && "piece has zero size");
|
|
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_bit_piece);
|
|
addUInt(*Loc, dwarf::DW_FORM_udata, PieceSizeInBits);
|
|
addUInt(*Loc, dwarf::DW_FORM_udata, PieceOffsetInBits);
|
|
|
|
} else
|
|
llvm_unreachable("unknown DIBuilder Opcode");
|
|
}
|
|
|
|
// Now attach the location information to the DIE.
|
|
addBlock(Die, Attribute, Loc);
|
|
}
|
|
|
|
/* Byref variables, in Blocks, are declared by the programmer as "SomeType
|
|
VarName;", but the compiler creates a __Block_byref_x_VarName struct, and
|
|
gives the variable VarName either the struct, or a pointer to the struct, as
|
|
its type. This is necessary for various behind-the-scenes things the
|
|
compiler needs to do with by-reference variables in Blocks.
|
|
|
|
However, as far as the original *programmer* is concerned, the variable
|
|
should still have type 'SomeType', as originally declared.
|
|
|
|
The function getBlockByrefType dives into the __Block_byref_x_VarName
|
|
struct to find the original type of the variable, which is then assigned to
|
|
the variable's Debug Information Entry as its real type. So far, so good.
|
|
However now the debugger will expect the variable VarName to have the type
|
|
SomeType. So we need the location attribute for the variable to be an
|
|
expression that explains to the debugger how to navigate through the
|
|
pointers and struct to find the actual variable of type SomeType.
|
|
|
|
The following function does just that. We start by getting
|
|
the "normal" location for the variable. This will be the location
|
|
of either the struct __Block_byref_x_VarName or the pointer to the
|
|
struct __Block_byref_x_VarName.
|
|
|
|
The struct will look something like:
|
|
|
|
struct __Block_byref_x_VarName {
|
|
... <various fields>
|
|
struct __Block_byref_x_VarName *forwarding;
|
|
... <various other fields>
|
|
SomeType VarName;
|
|
... <maybe more fields>
|
|
};
|
|
|
|
If we are given the struct directly (as our starting point) we
|
|
need to tell the debugger to:
|
|
|
|
1). Add the offset of the forwarding field.
|
|
|
|
2). Follow that pointer to get the real __Block_byref_x_VarName
|
|
struct to use (the real one may have been copied onto the heap).
|
|
|
|
3). Add the offset for the field VarName, to find the actual variable.
|
|
|
|
If we started with a pointer to the struct, then we need to
|
|
dereference that pointer first, before the other steps.
|
|
Translating this into DWARF ops, we will need to append the following
|
|
to the current location description for the variable:
|
|
|
|
DW_OP_deref -- optional, if we start with a pointer
|
|
DW_OP_plus_uconst <forward_fld_offset>
|
|
DW_OP_deref
|
|
DW_OP_plus_uconst <varName_fld_offset>
|
|
|
|
That is what this function does. */
|
|
|
|
/// addBlockByrefAddress - Start with the address based on the location
|
|
/// provided, and generate the DWARF information necessary to find the
|
|
/// actual Block variable (navigating the Block struct) based on the
|
|
/// starting location. Add the DWARF information to the die. For
|
|
/// more information, read large comment just above here.
|
|
///
|
|
void DwarfUnit::addBlockByrefAddress(const DbgVariable &DV, DIE &Die,
|
|
dwarf::Attribute Attribute,
|
|
const MachineLocation &Location) {
|
|
DIType Ty = DV.getType();
|
|
DIType TmpTy = Ty;
|
|
uint16_t Tag = Ty.getTag();
|
|
bool isPointer = false;
|
|
|
|
StringRef varName = DV.getName();
|
|
|
|
if (Tag == dwarf::DW_TAG_pointer_type) {
|
|
DIDerivedType DTy(Ty);
|
|
TmpTy = resolve(DTy.getTypeDerivedFrom());
|
|
isPointer = true;
|
|
}
|
|
|
|
DICompositeType blockStruct(TmpTy);
|
|
|
|
// Find the __forwarding field and the variable field in the __Block_byref
|
|
// struct.
|
|
DIArray Fields = blockStruct.getElements();
|
|
DIDerivedType varField;
|
|
DIDerivedType forwardingField;
|
|
|
|
for (unsigned i = 0, N = Fields.getNumElements(); i < N; ++i) {
|
|
DIDerivedType DT(Fields.getElement(i));
|
|
StringRef fieldName = DT.getName();
|
|
if (fieldName == "__forwarding")
|
|
forwardingField = DT;
|
|
else if (fieldName == varName)
|
|
varField = DT;
|
|
}
|
|
|
|
// Get the offsets for the forwarding field and the variable field.
|
|
unsigned forwardingFieldOffset = forwardingField.getOffsetInBits() >> 3;
|
|
unsigned varFieldOffset = varField.getOffsetInBits() >> 2;
|
|
|
|
// Decode the original location, and use that as the start of the byref
|
|
// variable's location.
|
|
DIELoc *Loc = new (DIEValueAllocator) DIELoc();
|
|
|
|
if (Location.isReg())
|
|
addRegisterOpPiece(*Loc, Location.getReg());
|
|
else
|
|
addRegisterOffset(*Loc, Location.getReg(), Location.getOffset());
|
|
|
|
// If we started with a pointer to the __Block_byref... struct, then
|
|
// the first thing we need to do is dereference the pointer (DW_OP_deref).
|
|
if (isPointer)
|
|
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
|
|
|
|
// Next add the offset for the '__forwarding' field:
|
|
// DW_OP_plus_uconst ForwardingFieldOffset. Note there's no point in
|
|
// adding the offset if it's 0.
|
|
if (forwardingFieldOffset > 0) {
|
|
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
|
|
addUInt(*Loc, dwarf::DW_FORM_udata, forwardingFieldOffset);
|
|
}
|
|
|
|
// Now dereference the __forwarding field to get to the real __Block_byref
|
|
// struct: DW_OP_deref.
|
|
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
|
|
|
|
// Now that we've got the real __Block_byref... struct, add the offset
|
|
// for the variable's field to get to the location of the actual variable:
|
|
// DW_OP_plus_uconst varFieldOffset. Again, don't add if it's 0.
|
|
if (varFieldOffset > 0) {
|
|
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
|
|
addUInt(*Loc, dwarf::DW_FORM_udata, varFieldOffset);
|
|
}
|
|
|
|
// Now attach the location information to the DIE.
|
|
addBlock(Die, Attribute, Loc);
|
|
}
|
|
|
|
/// Return true if type encoding is unsigned.
|
|
static bool isUnsignedDIType(DwarfDebug *DD, DIType Ty) {
|
|
DIDerivedType DTy(Ty);
|
|
if (DTy.isDerivedType()) {
|
|
dwarf::Tag T = (dwarf::Tag)Ty.getTag();
|
|
// Encode pointer constants as unsigned bytes. This is used at least for
|
|
// null pointer constant emission.
|
|
// FIXME: reference and rvalue_reference /probably/ shouldn't be allowed
|
|
// here, but accept them for now due to a bug in SROA producing bogus
|
|
// dbg.values.
|
|
if (T == dwarf::DW_TAG_pointer_type ||
|
|
T == dwarf::DW_TAG_ptr_to_member_type ||
|
|
T == dwarf::DW_TAG_reference_type ||
|
|
T == dwarf::DW_TAG_rvalue_reference_type)
|
|
return true;
|
|
assert(T == dwarf::DW_TAG_typedef || T == dwarf::DW_TAG_const_type ||
|
|
T == dwarf::DW_TAG_volatile_type ||
|
|
T == dwarf::DW_TAG_restrict_type ||
|
|
T == dwarf::DW_TAG_enumeration_type);
|
|
if (DITypeRef Deriv = DTy.getTypeDerivedFrom())
|
|
return isUnsignedDIType(DD, DD->resolve(Deriv));
|
|
// FIXME: Enums without a fixed underlying type have unknown signedness
|
|
// here, leading to incorrectly emitted constants.
|
|
assert(DTy.getTag() == dwarf::DW_TAG_enumeration_type);
|
|
return false;
|
|
}
|
|
|
|
DIBasicType BTy(Ty);
|
|
assert(BTy.isBasicType());
|
|
unsigned Encoding = BTy.getEncoding();
|
|
assert((Encoding == dwarf::DW_ATE_unsigned ||
|
|
Encoding == dwarf::DW_ATE_unsigned_char ||
|
|
Encoding == dwarf::DW_ATE_signed ||
|
|
Encoding == dwarf::DW_ATE_signed_char ||
|
|
Encoding == dwarf::DW_ATE_UTF || Encoding == dwarf::DW_ATE_boolean) &&
|
|
"Unsupported encoding");
|
|
return (Encoding == dwarf::DW_ATE_unsigned ||
|
|
Encoding == dwarf::DW_ATE_unsigned_char ||
|
|
Encoding == dwarf::DW_ATE_UTF || Encoding == dwarf::DW_ATE_boolean);
|
|
}
|
|
|
|
/// If this type is derived from a base type then return base type size.
|
|
static uint64_t getBaseTypeSize(DwarfDebug *DD, DIDerivedType Ty) {
|
|
unsigned Tag = Ty.getTag();
|
|
|
|
if (Tag != dwarf::DW_TAG_member && Tag != dwarf::DW_TAG_typedef &&
|
|
Tag != dwarf::DW_TAG_const_type && Tag != dwarf::DW_TAG_volatile_type &&
|
|
Tag != dwarf::DW_TAG_restrict_type)
|
|
return Ty.getSizeInBits();
|
|
|
|
DIType BaseType = DD->resolve(Ty.getTypeDerivedFrom());
|
|
|
|
// If this type is not derived from any type or the type is a declaration then
|
|
// take conservative approach.
|
|
if (!BaseType.isValid() || BaseType.isForwardDecl())
|
|
return Ty.getSizeInBits();
|
|
|
|
// If this is a derived type, go ahead and get the base type, unless it's a
|
|
// reference then it's just the size of the field. Pointer types have no need
|
|
// of this since they're a different type of qualification on the type.
|
|
if (BaseType.getTag() == dwarf::DW_TAG_reference_type ||
|
|
BaseType.getTag() == dwarf::DW_TAG_rvalue_reference_type)
|
|
return Ty.getSizeInBits();
|
|
|
|
if (BaseType.isDerivedType())
|
|
return getBaseTypeSize(DD, DIDerivedType(BaseType));
|
|
|
|
return BaseType.getSizeInBits();
|
|
}
|
|
|
|
/// addConstantFPValue - Add constant value entry in variable DIE.
|
|
void DwarfUnit::addConstantFPValue(DIE &Die, const MachineOperand &MO) {
|
|
assert(MO.isFPImm() && "Invalid machine operand!");
|
|
DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
|
|
APFloat FPImm = MO.getFPImm()->getValueAPF();
|
|
|
|
// Get the raw data form of the floating point.
|
|
const APInt FltVal = FPImm.bitcastToAPInt();
|
|
const char *FltPtr = (const char *)FltVal.getRawData();
|
|
|
|
int NumBytes = FltVal.getBitWidth() / 8; // 8 bits per byte.
|
|
bool LittleEndian = Asm->getDataLayout().isLittleEndian();
|
|
int Incr = (LittleEndian ? 1 : -1);
|
|
int Start = (LittleEndian ? 0 : NumBytes - 1);
|
|
int Stop = (LittleEndian ? NumBytes : -1);
|
|
|
|
// Output the constant to DWARF one byte at a time.
|
|
for (; Start != Stop; Start += Incr)
|
|
addUInt(*Block, dwarf::DW_FORM_data1, (unsigned char)0xFF & FltPtr[Start]);
|
|
|
|
addBlock(Die, dwarf::DW_AT_const_value, Block);
|
|
}
|
|
|
|
/// addConstantFPValue - Add constant value entry in variable DIE.
|
|
void DwarfUnit::addConstantFPValue(DIE &Die, const ConstantFP *CFP) {
|
|
// Pass this down to addConstantValue as an unsigned bag of bits.
|
|
addConstantValue(Die, CFP->getValueAPF().bitcastToAPInt(), true);
|
|
}
|
|
|
|
/// addConstantValue - Add constant value entry in variable DIE.
|
|
void DwarfUnit::addConstantValue(DIE &Die, const ConstantInt *CI, DIType Ty) {
|
|
addConstantValue(Die, CI->getValue(), Ty);
|
|
}
|
|
|
|
/// addConstantValue - Add constant value entry in variable DIE.
|
|
void DwarfUnit::addConstantValue(DIE &Die, const MachineOperand &MO,
|
|
DIType Ty) {
|
|
assert(MO.isImm() && "Invalid machine operand!");
|
|
|
|
addConstantValue(Die, isUnsignedDIType(DD, Ty), MO.getImm());
|
|
}
|
|
|
|
void DwarfUnit::addConstantValue(DIE &Die, bool Unsigned, uint64_t Val) {
|
|
// FIXME: This is a bit conservative/simple - it emits negative values always
|
|
// sign extended to 64 bits rather than minimizing the number of bytes.
|
|
addUInt(Die, dwarf::DW_AT_const_value,
|
|
Unsigned ? dwarf::DW_FORM_udata : dwarf::DW_FORM_sdata, Val);
|
|
}
|
|
|
|
void DwarfUnit::addConstantValue(DIE &Die, const APInt &Val, DIType Ty) {
|
|
addConstantValue(Die, Val, isUnsignedDIType(DD, Ty));
|
|
}
|
|
|
|
// addConstantValue - Add constant value entry in variable DIE.
|
|
void DwarfUnit::addConstantValue(DIE &Die, const APInt &Val, bool Unsigned) {
|
|
unsigned CIBitWidth = Val.getBitWidth();
|
|
if (CIBitWidth <= 64) {
|
|
addConstantValue(Die, Unsigned,
|
|
Unsigned ? Val.getZExtValue() : Val.getSExtValue());
|
|
return;
|
|
}
|
|
|
|
DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
|
|
|
|
// Get the raw data form of the large APInt.
|
|
const uint64_t *Ptr64 = Val.getRawData();
|
|
|
|
int NumBytes = Val.getBitWidth() / 8; // 8 bits per byte.
|
|
bool LittleEndian = Asm->getDataLayout().isLittleEndian();
|
|
|
|
// Output the constant to DWARF one byte at a time.
|
|
for (int i = 0; i < NumBytes; i++) {
|
|
uint8_t c;
|
|
if (LittleEndian)
|
|
c = Ptr64[i / 8] >> (8 * (i & 7));
|
|
else
|
|
c = Ptr64[(NumBytes - 1 - i) / 8] >> (8 * ((NumBytes - 1 - i) & 7));
|
|
addUInt(*Block, dwarf::DW_FORM_data1, c);
|
|
}
|
|
|
|
addBlock(Die, dwarf::DW_AT_const_value, Block);
|
|
}
|
|
|
|
/// addTemplateParams - Add template parameters into buffer.
|
|
void DwarfUnit::addTemplateParams(DIE &Buffer, DIArray TParams) {
|
|
// Add template parameters.
|
|
for (unsigned i = 0, e = TParams.getNumElements(); i != e; ++i) {
|
|
DIDescriptor Element = TParams.getElement(i);
|
|
if (Element.isTemplateTypeParameter())
|
|
constructTemplateTypeParameterDIE(Buffer,
|
|
DITemplateTypeParameter(Element));
|
|
else if (Element.isTemplateValueParameter())
|
|
constructTemplateValueParameterDIE(Buffer,
|
|
DITemplateValueParameter(Element));
|
|
}
|
|
}
|
|
|
|
/// getOrCreateContextDIE - Get context owner's DIE.
|
|
DIE *DwarfUnit::getOrCreateContextDIE(DIScope Context) {
|
|
if (!Context || Context.isFile())
|
|
return &getUnitDie();
|
|
if (Context.isType())
|
|
return getOrCreateTypeDIE(DIType(Context));
|
|
if (Context.isNameSpace())
|
|
return getOrCreateNameSpace(DINameSpace(Context));
|
|
if (Context.isSubprogram())
|
|
return getOrCreateSubprogramDIE(DISubprogram(Context));
|
|
return getDIE(Context);
|
|
}
|
|
|
|
DIE *DwarfUnit::createTypeDIE(DICompositeType Ty) {
|
|
DIScope Context = resolve(Ty.getContext());
|
|
DIE *ContextDIE = getOrCreateContextDIE(Context);
|
|
|
|
if (DIE *TyDIE = getDIE(Ty))
|
|
return TyDIE;
|
|
|
|
// Create new type.
|
|
DIE &TyDIE = createAndAddDIE(Ty.getTag(), *ContextDIE, Ty);
|
|
|
|
constructTypeDIE(TyDIE, Ty);
|
|
|
|
updateAcceleratorTables(Context, Ty, TyDIE);
|
|
return &TyDIE;
|
|
}
|
|
|
|
/// getOrCreateTypeDIE - Find existing DIE or create new DIE for the
|
|
/// given DIType.
|
|
DIE *DwarfUnit::getOrCreateTypeDIE(const MDNode *TyNode) {
|
|
if (!TyNode)
|
|
return nullptr;
|
|
|
|
DIType Ty(TyNode);
|
|
assert(Ty.isType());
|
|
assert(Ty == resolve(Ty.getRef()) &&
|
|
"type was not uniqued, possible ODR violation.");
|
|
|
|
// DW_TAG_restrict_type is not supported in DWARF2
|
|
if (Ty.getTag() == dwarf::DW_TAG_restrict_type && DD->getDwarfVersion() <= 2)
|
|
return getOrCreateTypeDIE(resolve(DIDerivedType(Ty).getTypeDerivedFrom()));
|
|
|
|
// Construct the context before querying for the existence of the DIE in case
|
|
// such construction creates the DIE.
|
|
DIScope Context = resolve(Ty.getContext());
|
|
DIE *ContextDIE = getOrCreateContextDIE(Context);
|
|
assert(ContextDIE);
|
|
|
|
if (DIE *TyDIE = getDIE(Ty))
|
|
return TyDIE;
|
|
|
|
// Create new type.
|
|
DIE &TyDIE = createAndAddDIE(Ty.getTag(), *ContextDIE, Ty);
|
|
|
|
updateAcceleratorTables(Context, Ty, TyDIE);
|
|
|
|
if (Ty.isBasicType())
|
|
constructTypeDIE(TyDIE, DIBasicType(Ty));
|
|
else if (Ty.isCompositeType()) {
|
|
DICompositeType CTy(Ty);
|
|
if (GenerateDwarfTypeUnits && !Ty.isForwardDecl())
|
|
if (MDString *TypeId = CTy.getIdentifier()) {
|
|
DD->addDwarfTypeUnitType(getCU(), TypeId->getString(), TyDIE, CTy);
|
|
// Skip updating the accelerator tables since this is not the full type.
|
|
return &TyDIE;
|
|
}
|
|
constructTypeDIE(TyDIE, CTy);
|
|
} else {
|
|
assert(Ty.isDerivedType() && "Unknown kind of DIType");
|
|
constructTypeDIE(TyDIE, DIDerivedType(Ty));
|
|
}
|
|
|
|
return &TyDIE;
|
|
}
|
|
|
|
void DwarfUnit::updateAcceleratorTables(DIScope Context, DIType Ty,
|
|
const DIE &TyDIE) {
|
|
if (!Ty.getName().empty() && !Ty.isForwardDecl()) {
|
|
bool IsImplementation = 0;
|
|
if (Ty.isCompositeType()) {
|
|
DICompositeType CT(Ty);
|
|
// A runtime language of 0 actually means C/C++ and that any
|
|
// non-negative value is some version of Objective-C/C++.
|
|
IsImplementation = (CT.getRunTimeLang() == 0) || CT.isObjcClassComplete();
|
|
}
|
|
unsigned Flags = IsImplementation ? dwarf::DW_FLAG_type_implementation : 0;
|
|
DD->addAccelType(Ty.getName(), TyDIE, Flags);
|
|
|
|
if ((!Context || Context.isCompileUnit() || Context.isFile() ||
|
|
Context.isNameSpace()) &&
|
|
getCUNode().getEmissionKind() != DIBuilder::LineTablesOnly)
|
|
GlobalTypes[getParentContextString(Context) + Ty.getName().str()] =
|
|
&TyDIE;
|
|
}
|
|
}
|
|
|
|
/// addType - Add a new type attribute to the specified entity.
|
|
void DwarfUnit::addType(DIE &Entity, DIType Ty, dwarf::Attribute Attribute) {
|
|
assert(Ty && "Trying to add a type that doesn't exist?");
|
|
|
|
// Check for pre-existence.
|
|
DIEEntry *Entry = getDIEEntry(Ty);
|
|
// If it exists then use the existing value.
|
|
if (Entry) {
|
|
addDIEEntry(Entity, Attribute, Entry);
|
|
return;
|
|
}
|
|
|
|
// Construct type.
|
|
DIE *Buffer = getOrCreateTypeDIE(Ty);
|
|
|
|
// Set up proxy.
|
|
Entry = createDIEEntry(*Buffer);
|
|
insertDIEEntry(Ty, Entry);
|
|
addDIEEntry(Entity, Attribute, Entry);
|
|
}
|
|
|
|
/// addGlobalName - Add a new global name to the compile unit.
|
|
void DwarfUnit::addGlobalName(StringRef Name, DIE &Die, DIScope Context) {
|
|
if (getCUNode().getEmissionKind() == DIBuilder::LineTablesOnly)
|
|
return;
|
|
std::string FullName = getParentContextString(Context) + Name.str();
|
|
GlobalNames[FullName] = &Die;
|
|
}
|
|
|
|
/// getParentContextString - Walks the metadata parent chain in a language
|
|
/// specific manner (using the compile unit language) and returns
|
|
/// it as a string. This is done at the metadata level because DIEs may
|
|
/// not currently have been added to the parent context and walking the
|
|
/// DIEs looking for names is more expensive than walking the metadata.
|
|
std::string DwarfUnit::getParentContextString(DIScope Context) const {
|
|
if (!Context)
|
|
return "";
|
|
|
|
// FIXME: Decide whether to implement this for non-C++ languages.
|
|
if (getLanguage() != dwarf::DW_LANG_C_plus_plus)
|
|
return "";
|
|
|
|
std::string CS;
|
|
SmallVector<DIScope, 1> Parents;
|
|
while (!Context.isCompileUnit()) {
|
|
Parents.push_back(Context);
|
|
if (Context.getContext())
|
|
Context = resolve(Context.getContext());
|
|
else
|
|
// Structure, etc types will have a NULL context if they're at the top
|
|
// level.
|
|
break;
|
|
}
|
|
|
|
// Reverse iterate over our list to go from the outermost construct to the
|
|
// innermost.
|
|
for (SmallVectorImpl<DIScope>::reverse_iterator I = Parents.rbegin(),
|
|
E = Parents.rend();
|
|
I != E; ++I) {
|
|
DIScope Ctx = *I;
|
|
StringRef Name = Ctx.getName();
|
|
if (Name.empty() && Ctx.isNameSpace())
|
|
Name = "(anonymous namespace)";
|
|
if (!Name.empty()) {
|
|
CS += Name;
|
|
CS += "::";
|
|
}
|
|
}
|
|
return CS;
|
|
}
|
|
|
|
/// constructTypeDIE - Construct basic type die from DIBasicType.
|
|
void DwarfUnit::constructTypeDIE(DIE &Buffer, DIBasicType BTy) {
|
|
// Get core information.
|
|
StringRef Name = BTy.getName();
|
|
// Add name if not anonymous or intermediate type.
|
|
if (!Name.empty())
|
|
addString(Buffer, dwarf::DW_AT_name, Name);
|
|
|
|
// An unspecified type only has a name attribute.
|
|
if (BTy.getTag() == dwarf::DW_TAG_unspecified_type)
|
|
return;
|
|
|
|
addUInt(Buffer, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
|
|
BTy.getEncoding());
|
|
|
|
uint64_t Size = BTy.getSizeInBits() >> 3;
|
|
addUInt(Buffer, dwarf::DW_AT_byte_size, None, Size);
|
|
}
|
|
|
|
/// constructTypeDIE - Construct derived type die from DIDerivedType.
|
|
void DwarfUnit::constructTypeDIE(DIE &Buffer, DIDerivedType DTy) {
|
|
// Get core information.
|
|
StringRef Name = DTy.getName();
|
|
uint64_t Size = DTy.getSizeInBits() >> 3;
|
|
uint16_t Tag = Buffer.getTag();
|
|
|
|
// Map to main type, void will not have a type.
|
|
DIType FromTy = resolve(DTy.getTypeDerivedFrom());
|
|
if (FromTy)
|
|
addType(Buffer, FromTy);
|
|
|
|
// Add name if not anonymous or intermediate type.
|
|
if (!Name.empty())
|
|
addString(Buffer, dwarf::DW_AT_name, Name);
|
|
|
|
// Add size if non-zero (derived types might be zero-sized.)
|
|
if (Size && Tag != dwarf::DW_TAG_pointer_type)
|
|
addUInt(Buffer, dwarf::DW_AT_byte_size, None, Size);
|
|
|
|
if (Tag == dwarf::DW_TAG_ptr_to_member_type)
|
|
addDIEEntry(Buffer, dwarf::DW_AT_containing_type,
|
|
*getOrCreateTypeDIE(resolve(DTy.getClassType())));
|
|
// Add source line info if available and TyDesc is not a forward declaration.
|
|
if (!DTy.isForwardDecl())
|
|
addSourceLine(Buffer, DTy);
|
|
}
|
|
|
|
/// constructSubprogramArguments - Construct function argument DIEs.
|
|
void DwarfUnit::constructSubprogramArguments(DIE &Buffer, DITypeArray Args) {
|
|
for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
|
|
DIType Ty = resolve(Args.getElement(i));
|
|
if (!Ty) {
|
|
assert(i == N-1 && "Unspecified parameter must be the last argument");
|
|
createAndAddDIE(dwarf::DW_TAG_unspecified_parameters, Buffer);
|
|
} else {
|
|
DIE &Arg = createAndAddDIE(dwarf::DW_TAG_formal_parameter, Buffer);
|
|
addType(Arg, DIType(Ty));
|
|
if (DIType(Ty).isArtificial())
|
|
addFlag(Arg, dwarf::DW_AT_artificial);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// constructTypeDIE - Construct type DIE from DICompositeType.
|
|
void DwarfUnit::constructTypeDIE(DIE &Buffer, DICompositeType CTy) {
|
|
// Add name if not anonymous or intermediate type.
|
|
StringRef Name = CTy.getName();
|
|
|
|
uint64_t Size = CTy.getSizeInBits() >> 3;
|
|
uint16_t Tag = Buffer.getTag();
|
|
|
|
switch (Tag) {
|
|
case dwarf::DW_TAG_array_type:
|
|
constructArrayTypeDIE(Buffer, CTy);
|
|
break;
|
|
case dwarf::DW_TAG_enumeration_type:
|
|
constructEnumTypeDIE(Buffer, CTy);
|
|
break;
|
|
case dwarf::DW_TAG_subroutine_type: {
|
|
// Add return type. A void return won't have a type.
|
|
DITypeArray Elements = DISubroutineType(CTy).getTypeArray();
|
|
DIType RTy(resolve(Elements.getElement(0)));
|
|
if (RTy)
|
|
addType(Buffer, RTy);
|
|
|
|
bool isPrototyped = true;
|
|
if (Elements.getNumElements() == 2 &&
|
|
!Elements.getElement(1))
|
|
isPrototyped = false;
|
|
|
|
constructSubprogramArguments(Buffer, Elements);
|
|
|
|
// Add prototype flag if we're dealing with a C language and the
|
|
// function has been prototyped.
|
|
uint16_t Language = getLanguage();
|
|
if (isPrototyped &&
|
|
(Language == dwarf::DW_LANG_C89 || Language == dwarf::DW_LANG_C99 ||
|
|
Language == dwarf::DW_LANG_ObjC))
|
|
addFlag(Buffer, dwarf::DW_AT_prototyped);
|
|
|
|
if (CTy.isLValueReference())
|
|
addFlag(Buffer, dwarf::DW_AT_reference);
|
|
|
|
if (CTy.isRValueReference())
|
|
addFlag(Buffer, dwarf::DW_AT_rvalue_reference);
|
|
} break;
|
|
case dwarf::DW_TAG_structure_type:
|
|
case dwarf::DW_TAG_union_type:
|
|
case dwarf::DW_TAG_class_type: {
|
|
// Add elements to structure type.
|
|
DIArray Elements = CTy.getElements();
|
|
for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
|
|
DIDescriptor Element = Elements.getElement(i);
|
|
if (Element.isSubprogram())
|
|
getOrCreateSubprogramDIE(DISubprogram(Element));
|
|
else if (Element.isDerivedType()) {
|
|
DIDerivedType DDTy(Element);
|
|
if (DDTy.getTag() == dwarf::DW_TAG_friend) {
|
|
DIE &ElemDie = createAndAddDIE(dwarf::DW_TAG_friend, Buffer);
|
|
addType(ElemDie, resolve(DDTy.getTypeDerivedFrom()),
|
|
dwarf::DW_AT_friend);
|
|
} else if (DDTy.isStaticMember()) {
|
|
getOrCreateStaticMemberDIE(DDTy);
|
|
} else {
|
|
constructMemberDIE(Buffer, DDTy);
|
|
}
|
|
} else if (Element.isObjCProperty()) {
|
|
DIObjCProperty Property(Element);
|
|
DIE &ElemDie = createAndAddDIE(Property.getTag(), Buffer);
|
|
StringRef PropertyName = Property.getObjCPropertyName();
|
|
addString(ElemDie, dwarf::DW_AT_APPLE_property_name, PropertyName);
|
|
if (Property.getType())
|
|
addType(ElemDie, Property.getType());
|
|
addSourceLine(ElemDie, Property);
|
|
StringRef GetterName = Property.getObjCPropertyGetterName();
|
|
if (!GetterName.empty())
|
|
addString(ElemDie, dwarf::DW_AT_APPLE_property_getter, GetterName);
|
|
StringRef SetterName = Property.getObjCPropertySetterName();
|
|
if (!SetterName.empty())
|
|
addString(ElemDie, dwarf::DW_AT_APPLE_property_setter, SetterName);
|
|
unsigned PropertyAttributes = 0;
|
|
if (Property.isReadOnlyObjCProperty())
|
|
PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_readonly;
|
|
if (Property.isReadWriteObjCProperty())
|
|
PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_readwrite;
|
|
if (Property.isAssignObjCProperty())
|
|
PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_assign;
|
|
if (Property.isRetainObjCProperty())
|
|
PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_retain;
|
|
if (Property.isCopyObjCProperty())
|
|
PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_copy;
|
|
if (Property.isNonAtomicObjCProperty())
|
|
PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_nonatomic;
|
|
if (PropertyAttributes)
|
|
addUInt(ElemDie, dwarf::DW_AT_APPLE_property_attribute, None,
|
|
PropertyAttributes);
|
|
|
|
DIEEntry *Entry = getDIEEntry(Element);
|
|
if (!Entry) {
|
|
Entry = createDIEEntry(ElemDie);
|
|
insertDIEEntry(Element, Entry);
|
|
}
|
|
} else
|
|
continue;
|
|
}
|
|
|
|
if (CTy.isAppleBlockExtension())
|
|
addFlag(Buffer, dwarf::DW_AT_APPLE_block);
|
|
|
|
DICompositeType ContainingType(resolve(CTy.getContainingType()));
|
|
if (ContainingType)
|
|
addDIEEntry(Buffer, dwarf::DW_AT_containing_type,
|
|
*getOrCreateTypeDIE(ContainingType));
|
|
|
|
if (CTy.isObjcClassComplete())
|
|
addFlag(Buffer, dwarf::DW_AT_APPLE_objc_complete_type);
|
|
|
|
// Add template parameters to a class, structure or union types.
|
|
// FIXME: The support isn't in the metadata for this yet.
|
|
if (Tag == dwarf::DW_TAG_class_type ||
|
|
Tag == dwarf::DW_TAG_structure_type || Tag == dwarf::DW_TAG_union_type)
|
|
addTemplateParams(Buffer, CTy.getTemplateParams());
|
|
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
// Add name if not anonymous or intermediate type.
|
|
if (!Name.empty())
|
|
addString(Buffer, dwarf::DW_AT_name, Name);
|
|
|
|
if (Tag == dwarf::DW_TAG_enumeration_type ||
|
|
Tag == dwarf::DW_TAG_class_type || Tag == dwarf::DW_TAG_structure_type ||
|
|
Tag == dwarf::DW_TAG_union_type) {
|
|
// Add size if non-zero (derived types might be zero-sized.)
|
|
// TODO: Do we care about size for enum forward declarations?
|
|
if (Size)
|
|
addUInt(Buffer, dwarf::DW_AT_byte_size, None, Size);
|
|
else if (!CTy.isForwardDecl())
|
|
// Add zero size if it is not a forward declaration.
|
|
addUInt(Buffer, dwarf::DW_AT_byte_size, None, 0);
|
|
|
|
// If we're a forward decl, say so.
|
|
if (CTy.isForwardDecl())
|
|
addFlag(Buffer, dwarf::DW_AT_declaration);
|
|
|
|
// Add source line info if available.
|
|
if (!CTy.isForwardDecl())
|
|
addSourceLine(Buffer, CTy);
|
|
|
|
// No harm in adding the runtime language to the declaration.
|
|
unsigned RLang = CTy.getRunTimeLang();
|
|
if (RLang)
|
|
addUInt(Buffer, dwarf::DW_AT_APPLE_runtime_class, dwarf::DW_FORM_data1,
|
|
RLang);
|
|
}
|
|
}
|
|
|
|
/// constructTemplateTypeParameterDIE - Construct new DIE for the given
|
|
/// DITemplateTypeParameter.
|
|
void DwarfUnit::constructTemplateTypeParameterDIE(DIE &Buffer,
|
|
DITemplateTypeParameter TP) {
|
|
DIE &ParamDIE =
|
|
createAndAddDIE(dwarf::DW_TAG_template_type_parameter, Buffer);
|
|
// Add the type if it exists, it could be void and therefore no type.
|
|
if (TP.getType())
|
|
addType(ParamDIE, resolve(TP.getType()));
|
|
if (!TP.getName().empty())
|
|
addString(ParamDIE, dwarf::DW_AT_name, TP.getName());
|
|
}
|
|
|
|
/// constructTemplateValueParameterDIE - Construct new DIE for the given
|
|
/// DITemplateValueParameter.
|
|
void
|
|
DwarfUnit::constructTemplateValueParameterDIE(DIE &Buffer,
|
|
DITemplateValueParameter VP) {
|
|
DIE &ParamDIE = createAndAddDIE(VP.getTag(), Buffer);
|
|
|
|
// Add the type if there is one, template template and template parameter
|
|
// packs will not have a type.
|
|
if (VP.getTag() == dwarf::DW_TAG_template_value_parameter)
|
|
addType(ParamDIE, resolve(VP.getType()));
|
|
if (!VP.getName().empty())
|
|
addString(ParamDIE, dwarf::DW_AT_name, VP.getName());
|
|
if (Value *Val = VP.getValue()) {
|
|
if (ConstantInt *CI = dyn_cast<ConstantInt>(Val))
|
|
addConstantValue(ParamDIE, CI, resolve(VP.getType()));
|
|
else if (GlobalValue *GV = dyn_cast<GlobalValue>(Val)) {
|
|
// For declaration non-type template parameters (such as global values and
|
|
// functions)
|
|
DIELoc *Loc = new (DIEValueAllocator) DIELoc();
|
|
addOpAddress(*Loc, Asm->getSymbol(GV));
|
|
// Emit DW_OP_stack_value to use the address as the immediate value of the
|
|
// parameter, rather than a pointer to it.
|
|
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_stack_value);
|
|
addBlock(ParamDIE, dwarf::DW_AT_location, Loc);
|
|
} else if (VP.getTag() == dwarf::DW_TAG_GNU_template_template_param) {
|
|
assert(isa<MDString>(Val));
|
|
addString(ParamDIE, dwarf::DW_AT_GNU_template_name,
|
|
cast<MDString>(Val)->getString());
|
|
} else if (VP.getTag() == dwarf::DW_TAG_GNU_template_parameter_pack) {
|
|
assert(isa<MDNode>(Val));
|
|
DIArray A(cast<MDNode>(Val));
|
|
addTemplateParams(ParamDIE, A);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// getOrCreateNameSpace - Create a DIE for DINameSpace.
|
|
DIE *DwarfUnit::getOrCreateNameSpace(DINameSpace NS) {
|
|
// Construct the context before querying for the existence of the DIE in case
|
|
// such construction creates the DIE.
|
|
DIE *ContextDIE = getOrCreateContextDIE(NS.getContext());
|
|
|
|
if (DIE *NDie = getDIE(NS))
|
|
return NDie;
|
|
DIE &NDie = createAndAddDIE(dwarf::DW_TAG_namespace, *ContextDIE, NS);
|
|
|
|
StringRef Name = NS.getName();
|
|
if (!Name.empty())
|
|
addString(NDie, dwarf::DW_AT_name, NS.getName());
|
|
else
|
|
Name = "(anonymous namespace)";
|
|
DD->addAccelNamespace(Name, NDie);
|
|
addGlobalName(Name, NDie, NS.getContext());
|
|
addSourceLine(NDie, NS);
|
|
return &NDie;
|
|
}
|
|
|
|
/// getOrCreateSubprogramDIE - Create new DIE using SP.
|
|
DIE *DwarfUnit::getOrCreateSubprogramDIE(DISubprogram SP) {
|
|
// Construct the context before querying for the existence of the DIE in case
|
|
// such construction creates the DIE (as is the case for member function
|
|
// declarations).
|
|
DIE *ContextDIE = getOrCreateContextDIE(resolve(SP.getContext()));
|
|
|
|
if (DIE *SPDie = getDIE(SP))
|
|
return SPDie;
|
|
|
|
if (DISubprogram SPDecl = SP.getFunctionDeclaration()) {
|
|
// Add subprogram definitions to the CU die directly.
|
|
ContextDIE = &getUnitDie();
|
|
// Build the decl now to ensure it precedes the definition.
|
|
getOrCreateSubprogramDIE(SPDecl);
|
|
}
|
|
|
|
// DW_TAG_inlined_subroutine may refer to this DIE.
|
|
DIE &SPDie = createAndAddDIE(dwarf::DW_TAG_subprogram, *ContextDIE, SP);
|
|
|
|
// Stop here and fill this in later, depending on whether or not this
|
|
// subprogram turns out to have inlined instances or not.
|
|
if (SP.isDefinition())
|
|
return &SPDie;
|
|
|
|
applySubprogramAttributes(SP, SPDie);
|
|
return &SPDie;
|
|
}
|
|
|
|
void DwarfUnit::applySubprogramAttributesToDefinition(DISubprogram SP, DIE &SPDie) {
|
|
DISubprogram SPDecl = SP.getFunctionDeclaration();
|
|
DIScope Context = resolve(SPDecl ? SPDecl.getContext() : SP.getContext());
|
|
applySubprogramAttributes(SP, SPDie);
|
|
addGlobalName(SP.getName(), SPDie, Context);
|
|
}
|
|
|
|
void DwarfUnit::applySubprogramAttributes(DISubprogram SP, DIE &SPDie) {
|
|
DIE *DeclDie = nullptr;
|
|
StringRef DeclLinkageName;
|
|
if (DISubprogram SPDecl = SP.getFunctionDeclaration()) {
|
|
DeclDie = getDIE(SPDecl);
|
|
assert(DeclDie && "This DIE should've already been constructed when the "
|
|
"definition DIE was created in "
|
|
"getOrCreateSubprogramDIE");
|
|
DeclLinkageName = SPDecl.getLinkageName();
|
|
}
|
|
|
|
// Add function template parameters.
|
|
addTemplateParams(SPDie, SP.getTemplateParams());
|
|
|
|
// Add the linkage name if we have one and it isn't in the Decl.
|
|
StringRef LinkageName = SP.getLinkageName();
|
|
assert(((LinkageName.empty() || DeclLinkageName.empty()) ||
|
|
LinkageName == DeclLinkageName) &&
|
|
"decl has a linkage name and it is different");
|
|
if (!LinkageName.empty() && DeclLinkageName.empty())
|
|
addString(SPDie, dwarf::DW_AT_MIPS_linkage_name,
|
|
GlobalValue::getRealLinkageName(LinkageName));
|
|
|
|
if (DeclDie) {
|
|
// Refer to the function declaration where all the other attributes will be
|
|
// found.
|
|
addDIEEntry(SPDie, dwarf::DW_AT_specification, *DeclDie);
|
|
return;
|
|
}
|
|
|
|
// Constructors and operators for anonymous aggregates do not have names.
|
|
if (!SP.getName().empty())
|
|
addString(SPDie, dwarf::DW_AT_name, SP.getName());
|
|
|
|
// Skip the rest of the attributes under -gmlt to save space.
|
|
if(getCUNode().getEmissionKind() == DIBuilder::LineTablesOnly)
|
|
return;
|
|
|
|
addSourceLine(SPDie, SP);
|
|
|
|
// Add the prototype if we have a prototype and we have a C like
|
|
// language.
|
|
uint16_t Language = getLanguage();
|
|
if (SP.isPrototyped() &&
|
|
(Language == dwarf::DW_LANG_C89 || Language == dwarf::DW_LANG_C99 ||
|
|
Language == dwarf::DW_LANG_ObjC))
|
|
addFlag(SPDie, dwarf::DW_AT_prototyped);
|
|
|
|
DISubroutineType SPTy = SP.getType();
|
|
assert(SPTy.getTag() == dwarf::DW_TAG_subroutine_type &&
|
|
"the type of a subprogram should be a subroutine");
|
|
|
|
DITypeArray Args = SPTy.getTypeArray();
|
|
// Add a return type. If this is a type like a C/C++ void type we don't add a
|
|
// return type.
|
|
if (resolve(Args.getElement(0)))
|
|
addType(SPDie, DIType(resolve(Args.getElement(0))));
|
|
|
|
unsigned VK = SP.getVirtuality();
|
|
if (VK) {
|
|
addUInt(SPDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1, VK);
|
|
DIELoc *Block = getDIELoc();
|
|
addUInt(*Block, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
|
|
addUInt(*Block, dwarf::DW_FORM_udata, SP.getVirtualIndex());
|
|
addBlock(SPDie, dwarf::DW_AT_vtable_elem_location, Block);
|
|
ContainingTypeMap.insert(
|
|
std::make_pair(&SPDie, resolve(SP.getContainingType())));
|
|
}
|
|
|
|
if (!SP.isDefinition()) {
|
|
addFlag(SPDie, dwarf::DW_AT_declaration);
|
|
|
|
// Add arguments. Do not add arguments for subprogram definition. They will
|
|
// be handled while processing variables.
|
|
constructSubprogramArguments(SPDie, Args);
|
|
}
|
|
|
|
if (SP.isArtificial())
|
|
addFlag(SPDie, dwarf::DW_AT_artificial);
|
|
|
|
if (!SP.isLocalToUnit())
|
|
addFlag(SPDie, dwarf::DW_AT_external);
|
|
|
|
if (SP.isOptimized())
|
|
addFlag(SPDie, dwarf::DW_AT_APPLE_optimized);
|
|
|
|
if (unsigned isa = Asm->getISAEncoding()) {
|
|
addUInt(SPDie, dwarf::DW_AT_APPLE_isa, dwarf::DW_FORM_flag, isa);
|
|
}
|
|
|
|
if (SP.isLValueReference())
|
|
addFlag(SPDie, dwarf::DW_AT_reference);
|
|
|
|
if (SP.isRValueReference())
|
|
addFlag(SPDie, dwarf::DW_AT_rvalue_reference);
|
|
|
|
if (SP.isProtected())
|
|
addUInt(SPDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
|
|
dwarf::DW_ACCESS_protected);
|
|
else if (SP.isPrivate())
|
|
addUInt(SPDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
|
|
dwarf::DW_ACCESS_private);
|
|
else if (SP.isPublic())
|
|
addUInt(SPDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
|
|
dwarf::DW_ACCESS_public);
|
|
|
|
if (SP.isExplicit())
|
|
addFlag(SPDie, dwarf::DW_AT_explicit);
|
|
}
|
|
|
|
void DwarfUnit::applyVariableAttributes(const DbgVariable &Var,
|
|
DIE &VariableDie) {
|
|
StringRef Name = Var.getName();
|
|
if (!Name.empty())
|
|
addString(VariableDie, dwarf::DW_AT_name, Name);
|
|
addSourceLine(VariableDie, Var.getVariable());
|
|
addType(VariableDie, Var.getType());
|
|
if (Var.isArtificial())
|
|
addFlag(VariableDie, dwarf::DW_AT_artificial);
|
|
}
|
|
|
|
// Return const expression if value is a GEP to access merged global
|
|
// constant. e.g.
|
|
// i8* getelementptr ({ i8, i8, i8, i8 }* @_MergedGlobals, i32 0, i32 0)
|
|
static const ConstantExpr *getMergedGlobalExpr(const Value *V) {
|
|
const ConstantExpr *CE = dyn_cast_or_null<ConstantExpr>(V);
|
|
if (!CE || CE->getNumOperands() != 3 ||
|
|
CE->getOpcode() != Instruction::GetElementPtr)
|
|
return nullptr;
|
|
|
|
// First operand points to a global struct.
|
|
Value *Ptr = CE->getOperand(0);
|
|
if (!isa<GlobalValue>(Ptr) ||
|
|
!isa<StructType>(cast<PointerType>(Ptr->getType())->getElementType()))
|
|
return nullptr;
|
|
|
|
// Second operand is zero.
|
|
const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(CE->getOperand(1));
|
|
if (!CI || !CI->isZero())
|
|
return nullptr;
|
|
|
|
// Third operand is offset.
|
|
if (!isa<ConstantInt>(CE->getOperand(2)))
|
|
return nullptr;
|
|
|
|
return CE;
|
|
}
|
|
|
|
/// getOrCreateGlobalVariableDIE - get or create global variable DIE.
|
|
DIE *DwarfCompileUnit::getOrCreateGlobalVariableDIE(DIGlobalVariable GV) {
|
|
// Check for pre-existence.
|
|
if (DIE *Die = getDIE(GV))
|
|
return Die;
|
|
|
|
assert(GV.isGlobalVariable());
|
|
|
|
DIScope GVContext = GV.getContext();
|
|
DIType GTy = DD->resolve(GV.getType());
|
|
|
|
// If this is a static data member definition, some attributes belong
|
|
// to the declaration DIE.
|
|
DIE *VariableDIE = nullptr;
|
|
bool IsStaticMember = false;
|
|
DIDerivedType SDMDecl = GV.getStaticDataMemberDeclaration();
|
|
if (SDMDecl.Verify()) {
|
|
assert(SDMDecl.isStaticMember() && "Expected static member decl");
|
|
// We need the declaration DIE that is in the static member's class.
|
|
VariableDIE = getOrCreateStaticMemberDIE(SDMDecl);
|
|
IsStaticMember = true;
|
|
}
|
|
|
|
// If this is not a static data member definition, create the variable
|
|
// DIE and add the initial set of attributes to it.
|
|
if (!VariableDIE) {
|
|
// Construct the context before querying for the existence of the DIE in
|
|
// case such construction creates the DIE.
|
|
DIE *ContextDIE = getOrCreateContextDIE(GVContext);
|
|
|
|
// Add to map.
|
|
VariableDIE = &createAndAddDIE(GV.getTag(), *ContextDIE, GV);
|
|
|
|
// Add name and type.
|
|
addString(*VariableDIE, dwarf::DW_AT_name, GV.getDisplayName());
|
|
addType(*VariableDIE, GTy);
|
|
|
|
// Add scoping info.
|
|
if (!GV.isLocalToUnit())
|
|
addFlag(*VariableDIE, dwarf::DW_AT_external);
|
|
|
|
// Add line number info.
|
|
addSourceLine(*VariableDIE, GV);
|
|
}
|
|
|
|
// Add location.
|
|
bool addToAccelTable = false;
|
|
DIE *VariableSpecDIE = nullptr;
|
|
bool isGlobalVariable = GV.getGlobal() != nullptr;
|
|
if (isGlobalVariable) {
|
|
addToAccelTable = true;
|
|
DIELoc *Loc = new (DIEValueAllocator) DIELoc();
|
|
const MCSymbol *Sym = Asm->getSymbol(GV.getGlobal());
|
|
if (GV.getGlobal()->isThreadLocal()) {
|
|
// FIXME: Make this work with -gsplit-dwarf.
|
|
unsigned PointerSize = Asm->getDataLayout().getPointerSize();
|
|
assert((PointerSize == 4 || PointerSize == 8) &&
|
|
"Add support for other sizes if necessary");
|
|
// Based on GCC's support for TLS:
|
|
if (!DD->useSplitDwarf()) {
|
|
// 1) Start with a constNu of the appropriate pointer size
|
|
addUInt(*Loc, dwarf::DW_FORM_data1,
|
|
PointerSize == 4 ? dwarf::DW_OP_const4u : dwarf::DW_OP_const8u);
|
|
// 2) containing the (relocated) offset of the TLS variable
|
|
// within the module's TLS block.
|
|
addExpr(*Loc, dwarf::DW_FORM_udata,
|
|
Asm->getObjFileLowering().getDebugThreadLocalSymbol(Sym));
|
|
} else {
|
|
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_const_index);
|
|
addUInt(*Loc, dwarf::DW_FORM_udata,
|
|
DD->getAddressPool().getIndex(Sym, /* TLS */ true));
|
|
}
|
|
// 3) followed by a custom OP to make the debugger do a TLS lookup.
|
|
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_push_tls_address);
|
|
} else {
|
|
DD->addArangeLabel(SymbolCU(this, Sym));
|
|
addOpAddress(*Loc, Sym);
|
|
}
|
|
// A static member's declaration is already flagged as such.
|
|
if (!SDMDecl.Verify() && !GV.isDefinition())
|
|
addFlag(*VariableDIE, dwarf::DW_AT_declaration);
|
|
// Do not create specification DIE if context is either compile unit
|
|
// or a subprogram.
|
|
if (GVContext && GV.isDefinition() && !GVContext.isCompileUnit() &&
|
|
!GVContext.isFile() && !DD->isSubprogramContext(GVContext)) {
|
|
// Create specification DIE.
|
|
VariableSpecDIE = &createAndAddDIE(dwarf::DW_TAG_variable, UnitDie);
|
|
addDIEEntry(*VariableSpecDIE, dwarf::DW_AT_specification, *VariableDIE);
|
|
addBlock(*VariableSpecDIE, dwarf::DW_AT_location, Loc);
|
|
// A static member's declaration is already flagged as such.
|
|
if (!SDMDecl.Verify())
|
|
addFlag(*VariableDIE, dwarf::DW_AT_declaration);
|
|
} else {
|
|
addBlock(*VariableDIE, dwarf::DW_AT_location, Loc);
|
|
}
|
|
// Add the linkage name.
|
|
StringRef LinkageName = GV.getLinkageName();
|
|
if (!LinkageName.empty())
|
|
// From DWARF4: DIEs to which DW_AT_linkage_name may apply include:
|
|
// TAG_common_block, TAG_constant, TAG_entry_point, TAG_subprogram and
|
|
// TAG_variable.
|
|
addString(IsStaticMember && VariableSpecDIE ? *VariableSpecDIE
|
|
: *VariableDIE,
|
|
DD->getDwarfVersion() >= 4 ? dwarf::DW_AT_linkage_name
|
|
: dwarf::DW_AT_MIPS_linkage_name,
|
|
GlobalValue::getRealLinkageName(LinkageName));
|
|
} else if (const ConstantInt *CI =
|
|
dyn_cast_or_null<ConstantInt>(GV.getConstant())) {
|
|
// AT_const_value was added when the static member was created. To avoid
|
|
// emitting AT_const_value multiple times, we only add AT_const_value when
|
|
// it is not a static member.
|
|
if (!IsStaticMember)
|
|
addConstantValue(*VariableDIE, CI, GTy);
|
|
} else if (const ConstantExpr *CE = getMergedGlobalExpr(GV->getOperand(11))) {
|
|
addToAccelTable = true;
|
|
// GV is a merged global.
|
|
DIELoc *Loc = new (DIEValueAllocator) DIELoc();
|
|
Value *Ptr = CE->getOperand(0);
|
|
MCSymbol *Sym = Asm->getSymbol(cast<GlobalValue>(Ptr));
|
|
DD->addArangeLabel(SymbolCU(this, Sym));
|
|
addOpAddress(*Loc, Sym);
|
|
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
|
|
SmallVector<Value *, 3> Idx(CE->op_begin() + 1, CE->op_end());
|
|
addUInt(*Loc, dwarf::DW_FORM_udata,
|
|
Asm->getDataLayout().getIndexedOffset(Ptr->getType(), Idx));
|
|
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
|
|
addBlock(*VariableDIE, dwarf::DW_AT_location, Loc);
|
|
}
|
|
|
|
DIE *ResultDIE = VariableSpecDIE ? VariableSpecDIE : VariableDIE;
|
|
|
|
if (addToAccelTable) {
|
|
DD->addAccelName(GV.getName(), *ResultDIE);
|
|
|
|
// If the linkage name is different than the name, go ahead and output
|
|
// that as well into the name table.
|
|
if (GV.getLinkageName() != "" && GV.getName() != GV.getLinkageName())
|
|
DD->addAccelName(GV.getLinkageName(), *ResultDIE);
|
|
}
|
|
|
|
addGlobalName(GV.getName(), *ResultDIE, GV.getContext());
|
|
return ResultDIE;
|
|
}
|
|
|
|
/// constructSubrangeDIE - Construct subrange DIE from DISubrange.
|
|
void DwarfUnit::constructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy) {
|
|
DIE &DW_Subrange = createAndAddDIE(dwarf::DW_TAG_subrange_type, Buffer);
|
|
addDIEEntry(DW_Subrange, dwarf::DW_AT_type, *IndexTy);
|
|
|
|
// The LowerBound value defines the lower bounds which is typically zero for
|
|
// C/C++. The Count value is the number of elements. Values are 64 bit. If
|
|
// Count == -1 then the array is unbounded and we do not emit
|
|
// DW_AT_lower_bound and DW_AT_count attributes.
|
|
int64_t LowerBound = SR.getLo();
|
|
int64_t DefaultLowerBound = getDefaultLowerBound();
|
|
int64_t Count = SR.getCount();
|
|
|
|
if (DefaultLowerBound == -1 || LowerBound != DefaultLowerBound)
|
|
addUInt(DW_Subrange, dwarf::DW_AT_lower_bound, None, LowerBound);
|
|
|
|
if (Count != -1)
|
|
// FIXME: An unbounded array should reference the expression that defines
|
|
// the array.
|
|
addUInt(DW_Subrange, dwarf::DW_AT_count, None, Count);
|
|
}
|
|
|
|
/// constructArrayTypeDIE - Construct array type DIE from DICompositeType.
|
|
void DwarfUnit::constructArrayTypeDIE(DIE &Buffer, DICompositeType CTy) {
|
|
if (CTy.isVector())
|
|
addFlag(Buffer, dwarf::DW_AT_GNU_vector);
|
|
|
|
// Emit the element type.
|
|
addType(Buffer, resolve(CTy.getTypeDerivedFrom()));
|
|
|
|
// Get an anonymous type for index type.
|
|
// FIXME: This type should be passed down from the front end
|
|
// as different languages may have different sizes for indexes.
|
|
DIE *IdxTy = getIndexTyDie();
|
|
if (!IdxTy) {
|
|
// Construct an integer type to use for indexes.
|
|
IdxTy = &createAndAddDIE(dwarf::DW_TAG_base_type, UnitDie);
|
|
addString(*IdxTy, dwarf::DW_AT_name, "sizetype");
|
|
addUInt(*IdxTy, dwarf::DW_AT_byte_size, None, sizeof(int64_t));
|
|
addUInt(*IdxTy, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
|
|
dwarf::DW_ATE_unsigned);
|
|
setIndexTyDie(IdxTy);
|
|
}
|
|
|
|
// Add subranges to array type.
|
|
DIArray Elements = CTy.getElements();
|
|
for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
|
|
DIDescriptor Element = Elements.getElement(i);
|
|
if (Element.getTag() == dwarf::DW_TAG_subrange_type)
|
|
constructSubrangeDIE(Buffer, DISubrange(Element), IdxTy);
|
|
}
|
|
}
|
|
|
|
/// constructEnumTypeDIE - Construct an enum type DIE from DICompositeType.
|
|
void DwarfUnit::constructEnumTypeDIE(DIE &Buffer, DICompositeType CTy) {
|
|
DIArray Elements = CTy.getElements();
|
|
|
|
// Add enumerators to enumeration type.
|
|
for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
|
|
DIEnumerator Enum(Elements.getElement(i));
|
|
if (Enum.isEnumerator()) {
|
|
DIE &Enumerator = createAndAddDIE(dwarf::DW_TAG_enumerator, Buffer);
|
|
StringRef Name = Enum.getName();
|
|
addString(Enumerator, dwarf::DW_AT_name, Name);
|
|
int64_t Value = Enum.getEnumValue();
|
|
addSInt(Enumerator, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata,
|
|
Value);
|
|
}
|
|
}
|
|
DIType DTy = resolve(CTy.getTypeDerivedFrom());
|
|
if (DTy) {
|
|
addType(Buffer, DTy);
|
|
addFlag(Buffer, dwarf::DW_AT_enum_class);
|
|
}
|
|
}
|
|
|
|
/// constructContainingTypeDIEs - Construct DIEs for types that contain
|
|
/// vtables.
|
|
void DwarfUnit::constructContainingTypeDIEs() {
|
|
for (DenseMap<DIE *, const MDNode *>::iterator CI = ContainingTypeMap.begin(),
|
|
CE = ContainingTypeMap.end();
|
|
CI != CE; ++CI) {
|
|
DIE &SPDie = *CI->first;
|
|
DIDescriptor D(CI->second);
|
|
if (!D)
|
|
continue;
|
|
DIE *NDie = getDIE(D);
|
|
if (!NDie)
|
|
continue;
|
|
addDIEEntry(SPDie, dwarf::DW_AT_containing_type, *NDie);
|
|
}
|
|
}
|
|
|
|
/// constructVariableDIE - Construct a DIE for the given DbgVariable.
|
|
std::unique_ptr<DIE> DwarfUnit::constructVariableDIE(DbgVariable &DV,
|
|
bool Abstract) {
|
|
auto D = constructVariableDIEImpl(DV, Abstract);
|
|
DV.setDIE(*D);
|
|
return D;
|
|
}
|
|
|
|
std::unique_ptr<DIE> DwarfUnit::constructVariableDIEImpl(const DbgVariable &DV,
|
|
bool Abstract) {
|
|
// Define variable debug information entry.
|
|
auto VariableDie = make_unique<DIE>(DV.getTag());
|
|
|
|
if (Abstract) {
|
|
applyVariableAttributes(DV, *VariableDie);
|
|
return VariableDie;
|
|
}
|
|
|
|
// Add variable address.
|
|
|
|
unsigned Offset = DV.getDotDebugLocOffset();
|
|
if (Offset != ~0U) {
|
|
addLocationList(*VariableDie, dwarf::DW_AT_location, Offset);
|
|
return VariableDie;
|
|
}
|
|
|
|
// Check if variable is described by a DBG_VALUE instruction.
|
|
if (const MachineInstr *DVInsn = DV.getMInsn()) {
|
|
assert(DVInsn->getNumOperands() == 4);
|
|
if (DVInsn->getOperand(0).isReg()) {
|
|
const MachineOperand RegOp = DVInsn->getOperand(0);
|
|
// If the second operand is an immediate, this is an indirect value.
|
|
if (DVInsn->getOperand(1).isImm()) {
|
|
MachineLocation Location(RegOp.getReg(),
|
|
DVInsn->getOperand(1).getImm());
|
|
addVariableAddress(DV, *VariableDie, Location);
|
|
} else if (RegOp.getReg())
|
|
addVariableAddress(DV, *VariableDie, MachineLocation(RegOp.getReg()));
|
|
} else if (DVInsn->getOperand(0).isImm())
|
|
addConstantValue(*VariableDie, DVInsn->getOperand(0), DV.getType());
|
|
else if (DVInsn->getOperand(0).isFPImm())
|
|
addConstantFPValue(*VariableDie, DVInsn->getOperand(0));
|
|
else if (DVInsn->getOperand(0).isCImm())
|
|
addConstantValue(*VariableDie, DVInsn->getOperand(0).getCImm(),
|
|
DV.getType());
|
|
|
|
return VariableDie;
|
|
}
|
|
|
|
// .. else use frame index.
|
|
int FI = DV.getFrameIndex();
|
|
if (FI != ~0) {
|
|
unsigned FrameReg = 0;
|
|
const TargetFrameLowering *TFI =
|
|
Asm->TM.getSubtargetImpl()->getFrameLowering();
|
|
int Offset = TFI->getFrameIndexReference(*Asm->MF, FI, FrameReg);
|
|
MachineLocation Location(FrameReg, Offset);
|
|
addVariableAddress(DV, *VariableDie, Location);
|
|
}
|
|
|
|
return VariableDie;
|
|
}
|
|
|
|
/// constructMemberDIE - Construct member DIE from DIDerivedType.
|
|
void DwarfUnit::constructMemberDIE(DIE &Buffer, DIDerivedType DT) {
|
|
DIE &MemberDie = createAndAddDIE(DT.getTag(), Buffer);
|
|
StringRef Name = DT.getName();
|
|
if (!Name.empty())
|
|
addString(MemberDie, dwarf::DW_AT_name, Name);
|
|
|
|
addType(MemberDie, resolve(DT.getTypeDerivedFrom()));
|
|
|
|
addSourceLine(MemberDie, DT);
|
|
|
|
if (DT.getTag() == dwarf::DW_TAG_inheritance && DT.isVirtual()) {
|
|
|
|
// For C++, virtual base classes are not at fixed offset. Use following
|
|
// expression to extract appropriate offset from vtable.
|
|
// BaseAddr = ObAddr + *((*ObAddr) - Offset)
|
|
|
|
DIELoc *VBaseLocationDie = new (DIEValueAllocator) DIELoc();
|
|
addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_dup);
|
|
addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
|
|
addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
|
|
addUInt(*VBaseLocationDie, dwarf::DW_FORM_udata, DT.getOffsetInBits());
|
|
addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_minus);
|
|
addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
|
|
addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
|
|
|
|
addBlock(MemberDie, dwarf::DW_AT_data_member_location, VBaseLocationDie);
|
|
} else {
|
|
uint64_t Size = DT.getSizeInBits();
|
|
uint64_t FieldSize = getBaseTypeSize(DD, DT);
|
|
uint64_t OffsetInBytes;
|
|
|
|
if (Size != FieldSize) {
|
|
// Handle bitfield, assume bytes are 8 bits.
|
|
addUInt(MemberDie, dwarf::DW_AT_byte_size, None, FieldSize/8);
|
|
addUInt(MemberDie, dwarf::DW_AT_bit_size, None, Size);
|
|
|
|
uint64_t Offset = DT.getOffsetInBits();
|
|
uint64_t AlignMask = ~(DT.getAlignInBits() - 1);
|
|
uint64_t HiMark = (Offset + FieldSize) & AlignMask;
|
|
uint64_t FieldOffset = (HiMark - FieldSize);
|
|
Offset -= FieldOffset;
|
|
|
|
// Maybe we need to work from the other end.
|
|
if (Asm->getDataLayout().isLittleEndian())
|
|
Offset = FieldSize - (Offset + Size);
|
|
addUInt(MemberDie, dwarf::DW_AT_bit_offset, None, Offset);
|
|
|
|
// Here DW_AT_data_member_location points to the anonymous
|
|
// field that includes this bit field.
|
|
OffsetInBytes = FieldOffset >> 3;
|
|
} else
|
|
// This is not a bitfield.
|
|
OffsetInBytes = DT.getOffsetInBits() >> 3;
|
|
|
|
if (DD->getDwarfVersion() <= 2) {
|
|
DIELoc *MemLocationDie = new (DIEValueAllocator) DIELoc();
|
|
addUInt(*MemLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
|
|
addUInt(*MemLocationDie, dwarf::DW_FORM_udata, OffsetInBytes);
|
|
addBlock(MemberDie, dwarf::DW_AT_data_member_location, MemLocationDie);
|
|
} else
|
|
addUInt(MemberDie, dwarf::DW_AT_data_member_location, None,
|
|
OffsetInBytes);
|
|
}
|
|
|
|
if (DT.isProtected())
|
|
addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
|
|
dwarf::DW_ACCESS_protected);
|
|
else if (DT.isPrivate())
|
|
addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
|
|
dwarf::DW_ACCESS_private);
|
|
// Otherwise C++ member and base classes are considered public.
|
|
else if (DT.isPublic())
|
|
addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
|
|
dwarf::DW_ACCESS_public);
|
|
if (DT.isVirtual())
|
|
addUInt(MemberDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1,
|
|
dwarf::DW_VIRTUALITY_virtual);
|
|
|
|
// Objective-C properties.
|
|
if (MDNode *PNode = DT.getObjCProperty())
|
|
if (DIEEntry *PropertyDie = getDIEEntry(PNode))
|
|
MemberDie.addValue(dwarf::DW_AT_APPLE_property, dwarf::DW_FORM_ref4,
|
|
PropertyDie);
|
|
|
|
if (DT.isArtificial())
|
|
addFlag(MemberDie, dwarf::DW_AT_artificial);
|
|
}
|
|
|
|
/// getOrCreateStaticMemberDIE - Create new DIE for C++ static member.
|
|
DIE *DwarfUnit::getOrCreateStaticMemberDIE(DIDerivedType DT) {
|
|
if (!DT.Verify())
|
|
return nullptr;
|
|
|
|
// Construct the context before querying for the existence of the DIE in case
|
|
// such construction creates the DIE.
|
|
DIE *ContextDIE = getOrCreateContextDIE(resolve(DT.getContext()));
|
|
assert(dwarf::isType(ContextDIE->getTag()) &&
|
|
"Static member should belong to a type.");
|
|
|
|
if (DIE *StaticMemberDIE = getDIE(DT))
|
|
return StaticMemberDIE;
|
|
|
|
DIE &StaticMemberDIE = createAndAddDIE(DT.getTag(), *ContextDIE, DT);
|
|
|
|
DIType Ty = resolve(DT.getTypeDerivedFrom());
|
|
|
|
addString(StaticMemberDIE, dwarf::DW_AT_name, DT.getName());
|
|
addType(StaticMemberDIE, Ty);
|
|
addSourceLine(StaticMemberDIE, DT);
|
|
addFlag(StaticMemberDIE, dwarf::DW_AT_external);
|
|
addFlag(StaticMemberDIE, dwarf::DW_AT_declaration);
|
|
|
|
// FIXME: We could omit private if the parent is a class_type, and
|
|
// public if the parent is something else.
|
|
if (DT.isProtected())
|
|
addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
|
|
dwarf::DW_ACCESS_protected);
|
|
else if (DT.isPrivate())
|
|
addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
|
|
dwarf::DW_ACCESS_private);
|
|
else if (DT.isPublic())
|
|
addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
|
|
dwarf::DW_ACCESS_public);
|
|
|
|
if (const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(DT.getConstant()))
|
|
addConstantValue(StaticMemberDIE, CI, Ty);
|
|
if (const ConstantFP *CFP = dyn_cast_or_null<ConstantFP>(DT.getConstant()))
|
|
addConstantFPValue(StaticMemberDIE, CFP);
|
|
|
|
return &StaticMemberDIE;
|
|
}
|
|
|
|
void DwarfUnit::emitHeader(const MCSymbol *ASectionSym) const {
|
|
Asm->OutStreamer.AddComment("DWARF version number");
|
|
Asm->EmitInt16(DD->getDwarfVersion());
|
|
Asm->OutStreamer.AddComment("Offset Into Abbrev. Section");
|
|
// We share one abbreviations table across all units so it's always at the
|
|
// start of the section. Use a relocatable offset where needed to ensure
|
|
// linking doesn't invalidate that offset.
|
|
if (ASectionSym)
|
|
Asm->EmitSectionOffset(ASectionSym, ASectionSym);
|
|
else
|
|
// Use a constant value when no symbol is provided.
|
|
Asm->EmitInt32(0);
|
|
Asm->OutStreamer.AddComment("Address Size (in bytes)");
|
|
Asm->EmitInt8(Asm->getDataLayout().getPointerSize());
|
|
}
|
|
|
|
void DwarfCompileUnit::addRange(RangeSpan Range) {
|
|
bool SameAsPrevCU = this == DD->getPrevCU();
|
|
DD->setPrevCU(this);
|
|
// If we have no current ranges just add the range and return, otherwise,
|
|
// check the current section and CU against the previous section and CU we
|
|
// emitted into and the subprogram was contained within. If these are the
|
|
// same then extend our current range, otherwise add this as a new range.
|
|
if (CURanges.empty() || !SameAsPrevCU ||
|
|
(&CURanges.back().getEnd()->getSection() !=
|
|
&Range.getEnd()->getSection())) {
|
|
CURanges.push_back(Range);
|
|
return;
|
|
}
|
|
|
|
CURanges.back().setEnd(Range.getEnd());
|
|
}
|
|
|
|
void DwarfCompileUnit::initStmtList(MCSymbol *DwarfLineSectionSym) {
|
|
// Define start line table label for each Compile Unit.
|
|
MCSymbol *LineTableStartSym =
|
|
Asm->OutStreamer.getDwarfLineTableSymbol(getUniqueID());
|
|
|
|
stmtListIndex = UnitDie.getValues().size();
|
|
|
|
// DW_AT_stmt_list is a offset of line number information for this
|
|
// compile unit in debug_line section. For split dwarf this is
|
|
// left in the skeleton CU and so not included.
|
|
// The line table entries are not always emitted in assembly, so it
|
|
// is not okay to use line_table_start here.
|
|
if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
|
|
addSectionLabel(UnitDie, dwarf::DW_AT_stmt_list, LineTableStartSym);
|
|
else
|
|
addSectionDelta(UnitDie, dwarf::DW_AT_stmt_list, LineTableStartSym,
|
|
DwarfLineSectionSym);
|
|
}
|
|
|
|
void DwarfCompileUnit::applyStmtList(DIE &D) {
|
|
D.addValue(dwarf::DW_AT_stmt_list,
|
|
UnitDie.getAbbrev().getData()[stmtListIndex].getForm(),
|
|
UnitDie.getValues()[stmtListIndex]);
|
|
}
|
|
|
|
void DwarfTypeUnit::emitHeader(const MCSymbol *ASectionSym) const {
|
|
DwarfUnit::emitHeader(ASectionSym);
|
|
Asm->OutStreamer.AddComment("Type Signature");
|
|
Asm->OutStreamer.EmitIntValue(TypeSignature, sizeof(TypeSignature));
|
|
Asm->OutStreamer.AddComment("Type DIE Offset");
|
|
// In a skeleton type unit there is no type DIE so emit a zero offset.
|
|
Asm->OutStreamer.EmitIntValue(Ty ? Ty->getOffset() : 0,
|
|
sizeof(Ty->getOffset()));
|
|
}
|
|
|
|
void DwarfTypeUnit::initSection(const MCSection *Section) {
|
|
assert(!this->Section);
|
|
this->Section = Section;
|
|
// Since each type unit is contained in its own COMDAT section, the begin
|
|
// label and the section label are the same. Using the begin label emission in
|
|
// DwarfDebug to emit the section label as well is slightly subtle/sneaky, but
|
|
// the only other alternative of lazily constructing start-of-section labels
|
|
// and storing a mapping in DwarfDebug (or AsmPrinter).
|
|
this->SectionSym = this->LabelBegin =
|
|
Asm->GetTempSymbol(Section->getLabelBeginName(), getUniqueID());
|
|
this->LabelEnd =
|
|
Asm->GetTempSymbol(Section->getLabelEndName(), getUniqueID());
|
|
}
|