mirror of
https://github.com/c64scene-ar/llvm-6502.git
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change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143074 91177308-0d34-0410-b5e6-96231b3b80d8
2010 lines
74 KiB
C++
2010 lines
74 KiB
C++
//===-- llvm/CodeGen/DwarfDebug.cpp - Dwarf Debug Framework ---------------===//
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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 writing dwarf debug info into asm files.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "dwarfdebug"
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#include "DwarfDebug.h"
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#include "DIE.h"
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#include "DwarfCompileUnit.h"
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#include "llvm/Constants.h"
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#include "llvm/Module.h"
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#include "llvm/Instructions.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/MC/MCAsmInfo.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/MC/MCSymbol.h"
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#include "llvm/Target/TargetData.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/TargetOptions.h"
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#include "llvm/Analysis/DebugInfo.h"
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#include "llvm/Analysis/DIBuilder.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/ValueHandle.h"
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/Support/Timer.h"
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#include "llvm/Support/Path.h"
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using namespace llvm;
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static cl::opt<bool> DisableDebugInfoPrinting("disable-debug-info-print",
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cl::Hidden,
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cl::desc("Disable debug info printing"));
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static cl::opt<bool> UnknownLocations("use-unknown-locations", cl::Hidden,
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cl::desc("Make an absence of debug location information explicit."),
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cl::init(false));
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namespace {
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const char *DWARFGroupName = "DWARF Emission";
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const char *DbgTimerName = "DWARF Debug Writer";
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} // end anonymous namespace
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//===----------------------------------------------------------------------===//
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/// Configuration values for initial hash set sizes (log2).
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///
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static const unsigned InitAbbreviationsSetSize = 9; // log2(512)
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namespace llvm {
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DIType DbgVariable::getType() const {
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DIType Ty = Var.getType();
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// FIXME: isBlockByrefVariable should be reformulated in terms of complex
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// addresses instead.
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if (Var.isBlockByrefVariable()) {
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/* Byref variables, in Blocks, are declared by the programmer as
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"SomeType VarName;", but the compiler creates a
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__Block_byref_x_VarName struct, and gives the variable VarName
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either the struct, or a pointer to the struct, as its type. This
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is necessary for various behind-the-scenes things the compiler
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needs to do with by-reference variables in blocks.
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However, as far as the original *programmer* is concerned, the
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variable should still have type 'SomeType', as originally declared.
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The following function dives into the __Block_byref_x_VarName
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struct to find the original type of the variable. This will be
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passed back to the code generating the type for the Debug
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Information Entry for the variable 'VarName'. 'VarName' will then
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have the original type 'SomeType' in its debug information.
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The original type 'SomeType' will be the type of the field named
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'VarName' inside the __Block_byref_x_VarName struct.
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NOTE: In order for this to not completely fail on the debugger
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side, the Debug Information Entry for the variable VarName needs to
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have a DW_AT_location that tells the debugger how to unwind through
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the pointers and __Block_byref_x_VarName struct to find the actual
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value of the variable. The function addBlockByrefType does this. */
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DIType subType = Ty;
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unsigned tag = Ty.getTag();
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if (tag == dwarf::DW_TAG_pointer_type) {
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DIDerivedType DTy = DIDerivedType(Ty);
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subType = DTy.getTypeDerivedFrom();
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}
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DICompositeType blockStruct = DICompositeType(subType);
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DIArray Elements = blockStruct.getTypeArray();
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for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
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DIDescriptor Element = Elements.getElement(i);
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DIDerivedType DT = DIDerivedType(Element);
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if (getName() == DT.getName())
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return (DT.getTypeDerivedFrom());
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}
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return Ty;
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}
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return Ty;
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}
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} // end llvm namespace
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DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
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: Asm(A), MMI(Asm->MMI), FirstCU(0),
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AbbreviationsSet(InitAbbreviationsSetSize),
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PrevLabel(NULL) {
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NextStringPoolNumber = 0;
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DwarfInfoSectionSym = DwarfAbbrevSectionSym = 0;
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DwarfStrSectionSym = TextSectionSym = 0;
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DwarfDebugRangeSectionSym = DwarfDebugLocSectionSym = 0;
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FunctionBeginSym = FunctionEndSym = 0;
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{
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NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
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beginModule(M);
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}
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}
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DwarfDebug::~DwarfDebug() {
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}
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MCSymbol *DwarfDebug::getStringPoolEntry(StringRef Str) {
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std::pair<MCSymbol*, unsigned> &Entry = StringPool[Str];
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if (Entry.first) return Entry.first;
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Entry.second = NextStringPoolNumber++;
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return Entry.first = Asm->GetTempSymbol("string", Entry.second);
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}
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/// assignAbbrevNumber - Define a unique number for the abbreviation.
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///
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void DwarfDebug::assignAbbrevNumber(DIEAbbrev &Abbrev) {
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// Profile the node so that we can make it unique.
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FoldingSetNodeID ID;
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Abbrev.Profile(ID);
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// Check the set for priors.
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DIEAbbrev *InSet = AbbreviationsSet.GetOrInsertNode(&Abbrev);
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// If it's newly added.
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if (InSet == &Abbrev) {
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// Add to abbreviation list.
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Abbreviations.push_back(&Abbrev);
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// Assign the vector position + 1 as its number.
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Abbrev.setNumber(Abbreviations.size());
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} else {
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// Assign existing abbreviation number.
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Abbrev.setNumber(InSet->getNumber());
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}
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}
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/// getRealLinkageName - If special LLVM prefix that is used to inform the asm
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/// printer to not emit usual symbol prefix before the symbol name is used then
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/// return linkage name after skipping this special LLVM prefix.
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static StringRef getRealLinkageName(StringRef LinkageName) {
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char One = '\1';
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if (LinkageName.startswith(StringRef(&One, 1)))
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return LinkageName.substr(1);
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return LinkageName;
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}
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/// updateSubprogramScopeDIE - Find DIE for the given subprogram and
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/// attach appropriate DW_AT_low_pc and DW_AT_high_pc attributes.
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/// If there are global variables in this scope then create and insert
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/// DIEs for these variables.
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DIE *DwarfDebug::updateSubprogramScopeDIE(CompileUnit *SPCU,
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const MDNode *SPNode) {
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DIE *SPDie = SPCU->getDIE(SPNode);
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assert(SPDie && "Unable to find subprogram DIE!");
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DISubprogram SP(SPNode);
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DISubprogram SPDecl = SP.getFunctionDeclaration();
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if (SPDecl.isSubprogram())
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// Refer function declaration directly.
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SPCU->addDIEEntry(SPDie, dwarf::DW_AT_specification, dwarf::DW_FORM_ref4,
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SPCU->getOrCreateSubprogramDIE(SPDecl));
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else {
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// There is not any need to generate specification DIE for a function
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// defined at compile unit level. If a function is defined inside another
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// function then gdb prefers the definition at top level and but does not
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// expect specification DIE in parent function. So avoid creating
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// specification DIE for a function defined inside a function.
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if (SP.isDefinition() && !SP.getContext().isCompileUnit() &&
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!SP.getContext().isFile() &&
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!isSubprogramContext(SP.getContext())) {
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SPCU->addUInt(SPDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
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// Add arguments.
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DICompositeType SPTy = SP.getType();
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DIArray Args = SPTy.getTypeArray();
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unsigned SPTag = SPTy.getTag();
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if (SPTag == dwarf::DW_TAG_subroutine_type)
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for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
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DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter);
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DIType ATy = DIType(DIType(Args.getElement(i)));
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SPCU->addType(Arg, ATy);
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if (ATy.isArtificial())
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SPCU->addUInt(Arg, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1);
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SPDie->addChild(Arg);
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}
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DIE *SPDeclDie = SPDie;
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SPDie = new DIE(dwarf::DW_TAG_subprogram);
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SPCU->addDIEEntry(SPDie, dwarf::DW_AT_specification, dwarf::DW_FORM_ref4,
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SPDeclDie);
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SPCU->addDie(SPDie);
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}
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}
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// Pick up abstract subprogram DIE.
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if (DIE *AbsSPDIE = AbstractSPDies.lookup(SPNode)) {
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SPDie = new DIE(dwarf::DW_TAG_subprogram);
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SPCU->addDIEEntry(SPDie, dwarf::DW_AT_abstract_origin,
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dwarf::DW_FORM_ref4, AbsSPDIE);
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SPCU->addDie(SPDie);
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}
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SPCU->addLabel(SPDie, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
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Asm->GetTempSymbol("func_begin", Asm->getFunctionNumber()));
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SPCU->addLabel(SPDie, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
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Asm->GetTempSymbol("func_end", Asm->getFunctionNumber()));
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const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
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MachineLocation Location(RI->getFrameRegister(*Asm->MF));
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SPCU->addAddress(SPDie, dwarf::DW_AT_frame_base, Location);
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return SPDie;
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}
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/// constructLexicalScope - Construct new DW_TAG_lexical_block
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/// for this scope and attach DW_AT_low_pc/DW_AT_high_pc labels.
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DIE *DwarfDebug::constructLexicalScopeDIE(CompileUnit *TheCU,
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LexicalScope *Scope) {
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DIE *ScopeDIE = new DIE(dwarf::DW_TAG_lexical_block);
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if (Scope->isAbstractScope())
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return ScopeDIE;
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const SmallVector<InsnRange, 4> &Ranges = Scope->getRanges();
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if (Ranges.empty())
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return 0;
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SmallVector<InsnRange, 4>::const_iterator RI = Ranges.begin();
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if (Ranges.size() > 1) {
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// .debug_range section has not been laid out yet. Emit offset in
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// .debug_range as a uint, size 4, for now. emitDIE will handle
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// DW_AT_ranges appropriately.
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TheCU->addUInt(ScopeDIE, dwarf::DW_AT_ranges, dwarf::DW_FORM_data4,
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DebugRangeSymbols.size()
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* Asm->getTargetData().getPointerSize());
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for (SmallVector<InsnRange, 4>::const_iterator RI = Ranges.begin(),
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RE = Ranges.end(); RI != RE; ++RI) {
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DebugRangeSymbols.push_back(getLabelBeforeInsn(RI->first));
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DebugRangeSymbols.push_back(getLabelAfterInsn(RI->second));
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}
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DebugRangeSymbols.push_back(NULL);
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DebugRangeSymbols.push_back(NULL);
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return ScopeDIE;
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}
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const MCSymbol *Start = getLabelBeforeInsn(RI->first);
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const MCSymbol *End = getLabelAfterInsn(RI->second);
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if (End == 0) return 0;
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assert(Start->isDefined() && "Invalid starting label for an inlined scope!");
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assert(End->isDefined() && "Invalid end label for an inlined scope!");
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TheCU->addLabel(ScopeDIE, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr, Start);
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TheCU->addLabel(ScopeDIE, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr, End);
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return ScopeDIE;
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}
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/// constructInlinedScopeDIE - This scope represents inlined body of
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/// a function. Construct DIE to represent this concrete inlined copy
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/// of the function.
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DIE *DwarfDebug::constructInlinedScopeDIE(CompileUnit *TheCU,
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LexicalScope *Scope) {
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const SmallVector<InsnRange, 4> &Ranges = Scope->getRanges();
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assert(Ranges.empty() == false &&
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"LexicalScope does not have instruction markers!");
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if (!Scope->getScopeNode())
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return NULL;
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DIScope DS(Scope->getScopeNode());
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DISubprogram InlinedSP = getDISubprogram(DS);
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DIE *OriginDIE = TheCU->getDIE(InlinedSP);
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if (!OriginDIE) {
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DEBUG(dbgs() << "Unable to find original DIE for inlined subprogram.");
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return NULL;
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}
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SmallVector<InsnRange, 4>::const_iterator RI = Ranges.begin();
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const MCSymbol *StartLabel = getLabelBeforeInsn(RI->first);
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const MCSymbol *EndLabel = getLabelAfterInsn(RI->second);
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if (StartLabel == 0 || EndLabel == 0) {
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assert(0 && "Unexpected Start and End labels for a inlined scope!");
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return 0;
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}
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assert(StartLabel->isDefined() &&
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"Invalid starting label for an inlined scope!");
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assert(EndLabel->isDefined() &&
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"Invalid end label for an inlined scope!");
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DIE *ScopeDIE = new DIE(dwarf::DW_TAG_inlined_subroutine);
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TheCU->addDIEEntry(ScopeDIE, dwarf::DW_AT_abstract_origin,
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dwarf::DW_FORM_ref4, OriginDIE);
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if (Ranges.size() > 1) {
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// .debug_range section has not been laid out yet. Emit offset in
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// .debug_range as a uint, size 4, for now. emitDIE will handle
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// DW_AT_ranges appropriately.
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TheCU->addUInt(ScopeDIE, dwarf::DW_AT_ranges, dwarf::DW_FORM_data4,
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DebugRangeSymbols.size()
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* Asm->getTargetData().getPointerSize());
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for (SmallVector<InsnRange, 4>::const_iterator RI = Ranges.begin(),
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RE = Ranges.end(); RI != RE; ++RI) {
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DebugRangeSymbols.push_back(getLabelBeforeInsn(RI->first));
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DebugRangeSymbols.push_back(getLabelAfterInsn(RI->second));
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}
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DebugRangeSymbols.push_back(NULL);
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DebugRangeSymbols.push_back(NULL);
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} else {
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TheCU->addLabel(ScopeDIE, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
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StartLabel);
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TheCU->addLabel(ScopeDIE, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
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EndLabel);
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}
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InlinedSubprogramDIEs.insert(OriginDIE);
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// Track the start label for this inlined function.
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//.debug_inlined section specification does not clearly state how
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// to emit inlined scope that is split into multiple instruction ranges.
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// For now, use first instruction range and emit low_pc/high_pc pair and
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// corresponding .debug_inlined section entry for this pair.
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DenseMap<const MDNode *, SmallVector<InlineInfoLabels, 4> >::iterator
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I = InlineInfo.find(InlinedSP);
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if (I == InlineInfo.end()) {
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InlineInfo[InlinedSP].push_back(std::make_pair(StartLabel, ScopeDIE));
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InlinedSPNodes.push_back(InlinedSP);
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} else
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I->second.push_back(std::make_pair(StartLabel, ScopeDIE));
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DILocation DL(Scope->getInlinedAt());
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TheCU->addUInt(ScopeDIE, dwarf::DW_AT_call_file, 0, TheCU->getID());
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TheCU->addUInt(ScopeDIE, dwarf::DW_AT_call_line, 0, DL.getLineNumber());
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return ScopeDIE;
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}
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/// constructScopeDIE - Construct a DIE for this scope.
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DIE *DwarfDebug::constructScopeDIE(CompileUnit *TheCU, LexicalScope *Scope) {
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if (!Scope || !Scope->getScopeNode())
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return NULL;
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SmallVector<DIE *, 8> Children;
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// Collect arguments for current function.
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if (LScopes.isCurrentFunctionScope(Scope))
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for (unsigned i = 0, N = CurrentFnArguments.size(); i < N; ++i)
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if (DbgVariable *ArgDV = CurrentFnArguments[i])
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if (DIE *Arg =
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TheCU->constructVariableDIE(ArgDV, Scope->isAbstractScope()))
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Children.push_back(Arg);
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// Collect lexical scope children first.
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const SmallVector<DbgVariable *, 8> &Variables = ScopeVariables.lookup(Scope);
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for (unsigned i = 0, N = Variables.size(); i < N; ++i)
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if (DIE *Variable =
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TheCU->constructVariableDIE(Variables[i], Scope->isAbstractScope()))
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Children.push_back(Variable);
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const SmallVector<LexicalScope *, 4> &Scopes = Scope->getChildren();
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for (unsigned j = 0, M = Scopes.size(); j < M; ++j)
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if (DIE *Nested = constructScopeDIE(TheCU, Scopes[j]))
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Children.push_back(Nested);
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DIScope DS(Scope->getScopeNode());
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DIE *ScopeDIE = NULL;
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if (Scope->getInlinedAt())
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ScopeDIE = constructInlinedScopeDIE(TheCU, Scope);
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else if (DS.isSubprogram()) {
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ProcessedSPNodes.insert(DS);
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if (Scope->isAbstractScope()) {
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ScopeDIE = TheCU->getDIE(DS);
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// Note down abstract DIE.
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if (ScopeDIE)
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AbstractSPDies.insert(std::make_pair(DS, ScopeDIE));
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}
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else
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ScopeDIE = updateSubprogramScopeDIE(TheCU, DS);
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}
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else {
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// There is no need to emit empty lexical block DIE.
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if (Children.empty())
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return NULL;
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ScopeDIE = constructLexicalScopeDIE(TheCU, Scope);
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}
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if (!ScopeDIE) return NULL;
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// Add children
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for (SmallVector<DIE *, 8>::iterator I = Children.begin(),
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E = Children.end(); I != E; ++I)
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ScopeDIE->addChild(*I);
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if (DS.isSubprogram())
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TheCU->addPubTypes(DISubprogram(DS));
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return ScopeDIE;
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}
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/// GetOrCreateSourceID - Look up the source id with the given directory and
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/// source file names. If none currently exists, create a new id and insert it
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/// in the SourceIds map. This can update DirectoryNames and SourceFileNames
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/// maps as well.
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unsigned DwarfDebug::GetOrCreateSourceID(StringRef FileName,
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StringRef DirName) {
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// If FE did not provide a file name, then assume stdin.
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if (FileName.empty())
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return GetOrCreateSourceID("<stdin>", StringRef());
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unsigned SrcId = SourceIdMap.size()+1;
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std::pair<std::string, std::string> SourceName =
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std::make_pair(FileName, DirName);
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std::pair<std::pair<std::string, std::string>, unsigned> Entry =
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make_pair(SourceName, SrcId);
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|
|
std::map<std::pair<std::string, std::string>, unsigned>::iterator I;
|
|
bool NewlyInserted;
|
|
tie(I, NewlyInserted) = SourceIdMap.insert(Entry);
|
|
if (!NewlyInserted)
|
|
return I->second;
|
|
|
|
// Print out a .file directive to specify files for .loc directives.
|
|
Asm->OutStreamer.EmitDwarfFileDirective(SrcId, Entry.first.second,
|
|
Entry.first.first);
|
|
|
|
return SrcId;
|
|
}
|
|
|
|
/// constructCompileUnit - Create new CompileUnit for the given
|
|
/// metadata node with tag DW_TAG_compile_unit.
|
|
CompileUnit *DwarfDebug::constructCompileUnit(const MDNode *N) {
|
|
DICompileUnit DIUnit(N);
|
|
StringRef FN = DIUnit.getFilename();
|
|
StringRef Dir = DIUnit.getDirectory();
|
|
unsigned ID = GetOrCreateSourceID(FN, Dir);
|
|
|
|
DIE *Die = new DIE(dwarf::DW_TAG_compile_unit);
|
|
CompileUnit *NewCU = new CompileUnit(ID, Die, Asm, this);
|
|
NewCU->addString(Die, dwarf::DW_AT_producer, dwarf::DW_FORM_string,
|
|
DIUnit.getProducer());
|
|
NewCU->addUInt(Die, dwarf::DW_AT_language, dwarf::DW_FORM_data2,
|
|
DIUnit.getLanguage());
|
|
NewCU->addString(Die, dwarf::DW_AT_name, dwarf::DW_FORM_string, FN);
|
|
// Use DW_AT_entry_pc instead of DW_AT_low_pc/DW_AT_high_pc pair. This
|
|
// simplifies debug range entries.
|
|
NewCU->addUInt(Die, dwarf::DW_AT_entry_pc, dwarf::DW_FORM_addr, 0);
|
|
// DW_AT_stmt_list is a offset of line number information for this
|
|
// compile unit in debug_line section.
|
|
if (Asm->MAI->doesDwarfRequireRelocationForSectionOffset())
|
|
NewCU->addLabel(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4,
|
|
Asm->GetTempSymbol("section_line"));
|
|
else
|
|
NewCU->addUInt(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4, 0);
|
|
|
|
if (!Dir.empty())
|
|
NewCU->addString(Die, dwarf::DW_AT_comp_dir, dwarf::DW_FORM_string, Dir);
|
|
if (DIUnit.isOptimized())
|
|
NewCU->addUInt(Die, dwarf::DW_AT_APPLE_optimized, dwarf::DW_FORM_flag, 1);
|
|
|
|
StringRef Flags = DIUnit.getFlags();
|
|
if (!Flags.empty())
|
|
NewCU->addString(Die, dwarf::DW_AT_APPLE_flags, dwarf::DW_FORM_string,
|
|
Flags);
|
|
|
|
if (unsigned RVer = DIUnit.getRunTimeVersion())
|
|
NewCU->addUInt(Die, dwarf::DW_AT_APPLE_major_runtime_vers,
|
|
dwarf::DW_FORM_data1, RVer);
|
|
|
|
if (!FirstCU)
|
|
FirstCU = NewCU;
|
|
CUMap.insert(std::make_pair(N, NewCU));
|
|
return NewCU;
|
|
}
|
|
|
|
/// construct SubprogramDIE - Construct subprogram DIE.
|
|
void DwarfDebug::constructSubprogramDIE(CompileUnit *TheCU,
|
|
const MDNode *N) {
|
|
DISubprogram SP(N);
|
|
if (!SP.isDefinition())
|
|
// This is a method declaration which will be handled while constructing
|
|
// class type.
|
|
return;
|
|
|
|
DIE *SubprogramDie = TheCU->getOrCreateSubprogramDIE(SP);
|
|
|
|
// Add to map.
|
|
TheCU->insertDIE(N, SubprogramDie);
|
|
|
|
// Add to context owner.
|
|
TheCU->addToContextOwner(SubprogramDie, SP.getContext());
|
|
|
|
// Expose as global.
|
|
TheCU->addGlobal(SP.getName(), SubprogramDie);
|
|
|
|
SPMap[N] = TheCU;
|
|
return;
|
|
}
|
|
|
|
/// collectInfoFromNamedMDNodes - Collect debug info from named mdnodes such
|
|
/// as llvm.dbg.enum and llvm.dbg.ty
|
|
void DwarfDebug::collectInfoFromNamedMDNodes(Module *M) {
|
|
if (NamedMDNode *NMD = M->getNamedMetadata("llvm.dbg.sp"))
|
|
for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
|
|
const MDNode *N = NMD->getOperand(i);
|
|
if (CompileUnit *CU = CUMap.lookup(DISubprogram(N).getCompileUnit()))
|
|
constructSubprogramDIE(CU, N);
|
|
}
|
|
|
|
if (NamedMDNode *NMD = M->getNamedMetadata("llvm.dbg.gv"))
|
|
for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
|
|
const MDNode *N = NMD->getOperand(i);
|
|
if (CompileUnit *CU = CUMap.lookup(DIGlobalVariable(N).getCompileUnit()))
|
|
CU->createGlobalVariableDIE(N);
|
|
}
|
|
|
|
if (NamedMDNode *NMD = M->getNamedMetadata("llvm.dbg.enum"))
|
|
for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
|
|
DIType Ty(NMD->getOperand(i));
|
|
if (CompileUnit *CU = CUMap.lookup(Ty.getCompileUnit()))
|
|
CU->getOrCreateTypeDIE(Ty);
|
|
}
|
|
|
|
if (NamedMDNode *NMD = M->getNamedMetadata("llvm.dbg.ty"))
|
|
for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
|
|
DIType Ty(NMD->getOperand(i));
|
|
if (CompileUnit *CU = CUMap.lookup(Ty.getCompileUnit()))
|
|
CU->getOrCreateTypeDIE(Ty);
|
|
}
|
|
}
|
|
|
|
/// collectLegacyDebugInfo - Collect debug info using DebugInfoFinder.
|
|
/// FIXME - Remove this when dragon-egg and llvm-gcc switch to DIBuilder.
|
|
bool DwarfDebug::collectLegacyDebugInfo(Module *M) {
|
|
DebugInfoFinder DbgFinder;
|
|
DbgFinder.processModule(*M);
|
|
|
|
bool HasDebugInfo = false;
|
|
// Scan all the compile-units to see if there are any marked as the main
|
|
// unit. If not, we do not generate debug info.
|
|
for (DebugInfoFinder::iterator I = DbgFinder.compile_unit_begin(),
|
|
E = DbgFinder.compile_unit_end(); I != E; ++I) {
|
|
if (DICompileUnit(*I).isMain()) {
|
|
HasDebugInfo = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!HasDebugInfo) return false;
|
|
|
|
// Create all the compile unit DIEs.
|
|
for (DebugInfoFinder::iterator I = DbgFinder.compile_unit_begin(),
|
|
E = DbgFinder.compile_unit_end(); I != E; ++I)
|
|
constructCompileUnit(*I);
|
|
|
|
// Create DIEs for each global variable.
|
|
for (DebugInfoFinder::iterator I = DbgFinder.global_variable_begin(),
|
|
E = DbgFinder.global_variable_end(); I != E; ++I) {
|
|
const MDNode *N = *I;
|
|
if (CompileUnit *CU = CUMap.lookup(DIGlobalVariable(N).getCompileUnit()))
|
|
CU->createGlobalVariableDIE(N);
|
|
}
|
|
|
|
// Create DIEs for each subprogram.
|
|
for (DebugInfoFinder::iterator I = DbgFinder.subprogram_begin(),
|
|
E = DbgFinder.subprogram_end(); I != E; ++I) {
|
|
const MDNode *N = *I;
|
|
if (CompileUnit *CU = CUMap.lookup(DISubprogram(N).getCompileUnit()))
|
|
constructSubprogramDIE(CU, N);
|
|
}
|
|
|
|
return HasDebugInfo;
|
|
}
|
|
|
|
/// beginModule - Emit all Dwarf sections that should come prior to the
|
|
/// content. Create global DIEs and emit initial debug info sections.
|
|
/// This is invoked by the target AsmPrinter.
|
|
void DwarfDebug::beginModule(Module *M) {
|
|
if (DisableDebugInfoPrinting)
|
|
return;
|
|
|
|
// If module has named metadata anchors then use them, otherwise scan the
|
|
// module using debug info finder to collect debug info.
|
|
NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
|
|
if (CU_Nodes) {
|
|
for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
|
|
DICompileUnit CUNode(CU_Nodes->getOperand(i));
|
|
CompileUnit *CU = constructCompileUnit(CUNode);
|
|
DIArray GVs = CUNode.getGlobalVariables();
|
|
for (unsigned i = 0, e = GVs.getNumElements(); i != e; ++i)
|
|
CU->createGlobalVariableDIE(GVs.getElement(i));
|
|
DIArray SPs = CUNode.getSubprograms();
|
|
for (unsigned i = 0, e = SPs.getNumElements(); i != e; ++i)
|
|
constructSubprogramDIE(CU, SPs.getElement(i));
|
|
DIArray EnumTypes = CUNode.getEnumTypes();
|
|
for (unsigned i = 0, e = EnumTypes.getNumElements(); i != e; ++i)
|
|
CU->getOrCreateTypeDIE(EnumTypes.getElement(i));
|
|
DIArray RetainedTypes = CUNode.getRetainedTypes();
|
|
for (unsigned i = 0, e = RetainedTypes.getNumElements(); i != e; ++i)
|
|
CU->getOrCreateTypeDIE(RetainedTypes.getElement(i));
|
|
}
|
|
} else if (!collectLegacyDebugInfo(M))
|
|
return;
|
|
|
|
collectInfoFromNamedMDNodes(M);
|
|
|
|
// Tell MMI that we have debug info.
|
|
MMI->setDebugInfoAvailability(true);
|
|
|
|
// Emit initial sections.
|
|
EmitSectionLabels();
|
|
|
|
// Prime section data.
|
|
SectionMap.insert(Asm->getObjFileLowering().getTextSection());
|
|
}
|
|
|
|
/// endModule - Emit all Dwarf sections that should come after the content.
|
|
///
|
|
void DwarfDebug::endModule() {
|
|
if (!FirstCU) return;
|
|
const Module *M = MMI->getModule();
|
|
DenseMap<const MDNode *, LexicalScope *> DeadFnScopeMap;
|
|
|
|
// Collect info for variables that were optimized out.
|
|
if (NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu")) {
|
|
for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
|
|
DICompileUnit TheCU(CU_Nodes->getOperand(i));
|
|
DIArray Subprograms = TheCU.getSubprograms();
|
|
for (unsigned i = 0, e = Subprograms.getNumElements(); i != e; ++i) {
|
|
DISubprogram SP(Subprograms.getElement(i));
|
|
if (ProcessedSPNodes.count(SP) != 0) continue;
|
|
if (!SP.Verify()) continue;
|
|
if (!SP.isDefinition()) continue;
|
|
DIArray Variables = SP.getVariables();
|
|
if (Variables.getNumElements() == 0) continue;
|
|
|
|
LexicalScope *Scope =
|
|
new LexicalScope(NULL, DIDescriptor(SP), NULL, false);
|
|
DeadFnScopeMap[SP] = Scope;
|
|
|
|
// Construct subprogram DIE and add variables DIEs.
|
|
CompileUnit *SPCU = CUMap.lookup(TheCU);
|
|
assert(SPCU && "Unable to find Compile Unit!");
|
|
constructSubprogramDIE(SPCU, SP);
|
|
DIE *ScopeDIE = SPCU->getDIE(SP);
|
|
for (unsigned vi = 0, ve = Variables.getNumElements(); vi != ve; ++vi) {
|
|
DIVariable DV(Variables.getElement(vi));
|
|
if (!DV.Verify()) continue;
|
|
DbgVariable *NewVar = new DbgVariable(DV, NULL);
|
|
if (DIE *VariableDIE =
|
|
SPCU->constructVariableDIE(NewVar, Scope->isAbstractScope()))
|
|
ScopeDIE->addChild(VariableDIE);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Attach DW_AT_inline attribute with inlined subprogram DIEs.
|
|
for (SmallPtrSet<DIE *, 4>::iterator AI = InlinedSubprogramDIEs.begin(),
|
|
AE = InlinedSubprogramDIEs.end(); AI != AE; ++AI) {
|
|
DIE *ISP = *AI;
|
|
FirstCU->addUInt(ISP, dwarf::DW_AT_inline, 0, dwarf::DW_INL_inlined);
|
|
}
|
|
|
|
// Emit DW_AT_containing_type attribute to connect types with their
|
|
// vtable holding type.
|
|
for (DenseMap<const MDNode *, CompileUnit *>::iterator CUI = CUMap.begin(),
|
|
CUE = CUMap.end(); CUI != CUE; ++CUI) {
|
|
CompileUnit *TheCU = CUI->second;
|
|
TheCU->constructContainingTypeDIEs();
|
|
}
|
|
|
|
// Standard sections final addresses.
|
|
Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering().getTextSection());
|
|
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("text_end"));
|
|
Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering().getDataSection());
|
|
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("data_end"));
|
|
|
|
// End text sections.
|
|
for (unsigned i = 1, N = SectionMap.size(); i <= N; ++i) {
|
|
Asm->OutStreamer.SwitchSection(SectionMap[i]);
|
|
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("section_end", i));
|
|
}
|
|
|
|
// Compute DIE offsets and sizes.
|
|
computeSizeAndOffsets();
|
|
|
|
// Emit all the DIEs into a debug info section
|
|
emitDebugInfo();
|
|
|
|
// Corresponding abbreviations into a abbrev section.
|
|
emitAbbreviations();
|
|
|
|
// Emit info into a debug pubnames section.
|
|
emitDebugPubNames();
|
|
|
|
// Emit info into a debug pubtypes section.
|
|
emitDebugPubTypes();
|
|
|
|
// Emit info into a debug loc section.
|
|
emitDebugLoc();
|
|
|
|
// Emit info into a debug aranges section.
|
|
EmitDebugARanges();
|
|
|
|
// Emit info into a debug ranges section.
|
|
emitDebugRanges();
|
|
|
|
// Emit info into a debug macinfo section.
|
|
emitDebugMacInfo();
|
|
|
|
// Emit inline info.
|
|
emitDebugInlineInfo();
|
|
|
|
// Emit info into a debug str section.
|
|
emitDebugStr();
|
|
|
|
// clean up.
|
|
DeleteContainerSeconds(DeadFnScopeMap);
|
|
SPMap.clear();
|
|
for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
|
|
E = CUMap.end(); I != E; ++I)
|
|
delete I->second;
|
|
FirstCU = NULL; // Reset for the next Module, if any.
|
|
}
|
|
|
|
/// findAbstractVariable - Find abstract variable, if any, associated with Var.
|
|
DbgVariable *DwarfDebug::findAbstractVariable(DIVariable &DV,
|
|
DebugLoc ScopeLoc) {
|
|
LLVMContext &Ctx = DV->getContext();
|
|
// More then one inlined variable corresponds to one abstract variable.
|
|
DIVariable Var = cleanseInlinedVariable(DV, Ctx);
|
|
DbgVariable *AbsDbgVariable = AbstractVariables.lookup(Var);
|
|
if (AbsDbgVariable)
|
|
return AbsDbgVariable;
|
|
|
|
LexicalScope *Scope = LScopes.findAbstractScope(ScopeLoc.getScope(Ctx));
|
|
if (!Scope)
|
|
return NULL;
|
|
|
|
AbsDbgVariable = new DbgVariable(Var, NULL);
|
|
addScopeVariable(Scope, AbsDbgVariable);
|
|
AbstractVariables[Var] = AbsDbgVariable;
|
|
return AbsDbgVariable;
|
|
}
|
|
|
|
/// addCurrentFnArgument - If Var is a current function argument then add
|
|
/// it to CurrentFnArguments list.
|
|
bool DwarfDebug::addCurrentFnArgument(const MachineFunction *MF,
|
|
DbgVariable *Var, LexicalScope *Scope) {
|
|
if (!LScopes.isCurrentFunctionScope(Scope))
|
|
return false;
|
|
DIVariable DV = Var->getVariable();
|
|
if (DV.getTag() != dwarf::DW_TAG_arg_variable)
|
|
return false;
|
|
unsigned ArgNo = DV.getArgNumber();
|
|
if (ArgNo == 0)
|
|
return false;
|
|
|
|
size_t Size = CurrentFnArguments.size();
|
|
if (Size == 0)
|
|
CurrentFnArguments.resize(MF->getFunction()->arg_size());
|
|
// llvm::Function argument size is not good indicator of how many
|
|
// arguments does the function have at source level.
|
|
if (ArgNo > Size)
|
|
CurrentFnArguments.resize(ArgNo * 2);
|
|
CurrentFnArguments[ArgNo - 1] = Var;
|
|
return true;
|
|
}
|
|
|
|
/// collectVariableInfoFromMMITable - Collect variable information from
|
|
/// side table maintained by MMI.
|
|
void
|
|
DwarfDebug::collectVariableInfoFromMMITable(const MachineFunction *MF,
|
|
SmallPtrSet<const MDNode *, 16> &Processed) {
|
|
MachineModuleInfo::VariableDbgInfoMapTy &VMap = MMI->getVariableDbgInfo();
|
|
for (MachineModuleInfo::VariableDbgInfoMapTy::iterator VI = VMap.begin(),
|
|
VE = VMap.end(); VI != VE; ++VI) {
|
|
const MDNode *Var = VI->first;
|
|
if (!Var) continue;
|
|
Processed.insert(Var);
|
|
DIVariable DV(Var);
|
|
const std::pair<unsigned, DebugLoc> &VP = VI->second;
|
|
|
|
LexicalScope *Scope = LScopes.findLexicalScope(VP.second);
|
|
|
|
// If variable scope is not found then skip this variable.
|
|
if (Scope == 0)
|
|
continue;
|
|
|
|
DbgVariable *AbsDbgVariable = findAbstractVariable(DV, VP.second);
|
|
DbgVariable *RegVar = new DbgVariable(DV, AbsDbgVariable);
|
|
RegVar->setFrameIndex(VP.first);
|
|
if (!addCurrentFnArgument(MF, RegVar, Scope))
|
|
addScopeVariable(Scope, RegVar);
|
|
if (AbsDbgVariable)
|
|
AbsDbgVariable->setFrameIndex(VP.first);
|
|
}
|
|
}
|
|
|
|
/// isDbgValueInDefinedReg - Return true if debug value, encoded by
|
|
/// DBG_VALUE instruction, is in a defined reg.
|
|
static bool isDbgValueInDefinedReg(const MachineInstr *MI) {
|
|
assert(MI->isDebugValue() && "Invalid DBG_VALUE machine instruction!");
|
|
return MI->getNumOperands() == 3 &&
|
|
MI->getOperand(0).isReg() && MI->getOperand(0).getReg() &&
|
|
MI->getOperand(1).isImm() && MI->getOperand(1).getImm() == 0;
|
|
}
|
|
|
|
/// getDebugLocEntry - Get .debug_loc entry for the instruction range starting
|
|
/// at MI.
|
|
static DotDebugLocEntry getDebugLocEntry(AsmPrinter *Asm,
|
|
const MCSymbol *FLabel,
|
|
const MCSymbol *SLabel,
|
|
const MachineInstr *MI) {
|
|
const MDNode *Var = MI->getOperand(MI->getNumOperands() - 1).getMetadata();
|
|
|
|
if (MI->getNumOperands() != 3) {
|
|
MachineLocation MLoc = Asm->getDebugValueLocation(MI);
|
|
return DotDebugLocEntry(FLabel, SLabel, MLoc, Var);
|
|
}
|
|
if (MI->getOperand(0).isReg() && MI->getOperand(1).isImm()) {
|
|
MachineLocation MLoc;
|
|
MLoc.set(MI->getOperand(0).getReg(), MI->getOperand(1).getImm());
|
|
return DotDebugLocEntry(FLabel, SLabel, MLoc, Var);
|
|
}
|
|
if (MI->getOperand(0).isImm())
|
|
return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getImm());
|
|
if (MI->getOperand(0).isFPImm())
|
|
return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getFPImm());
|
|
if (MI->getOperand(0).isCImm())
|
|
return DotDebugLocEntry(FLabel, SLabel, MI->getOperand(0).getCImm());
|
|
|
|
assert(0 && "Unexpected 3 operand DBG_VALUE instruction!");
|
|
return DotDebugLocEntry();
|
|
}
|
|
|
|
/// collectVariableInfo - Find variables for each lexical scope.
|
|
void
|
|
DwarfDebug::collectVariableInfo(const MachineFunction *MF,
|
|
SmallPtrSet<const MDNode *, 16> &Processed) {
|
|
|
|
/// collection info from MMI table.
|
|
collectVariableInfoFromMMITable(MF, Processed);
|
|
|
|
for (SmallVectorImpl<const MDNode*>::const_iterator
|
|
UVI = UserVariables.begin(), UVE = UserVariables.end(); UVI != UVE;
|
|
++UVI) {
|
|
const MDNode *Var = *UVI;
|
|
if (Processed.count(Var))
|
|
continue;
|
|
|
|
// History contains relevant DBG_VALUE instructions for Var and instructions
|
|
// clobbering it.
|
|
SmallVectorImpl<const MachineInstr*> &History = DbgValues[Var];
|
|
if (History.empty())
|
|
continue;
|
|
const MachineInstr *MInsn = History.front();
|
|
|
|
DIVariable DV(Var);
|
|
LexicalScope *Scope = NULL;
|
|
if (DV.getTag() == dwarf::DW_TAG_arg_variable &&
|
|
DISubprogram(DV.getContext()).describes(MF->getFunction()))
|
|
Scope = LScopes.getCurrentFunctionScope();
|
|
else {
|
|
if (DV.getVersion() <= LLVMDebugVersion9)
|
|
Scope = LScopes.findLexicalScope(MInsn->getDebugLoc());
|
|
else {
|
|
if (MDNode *IA = DV.getInlinedAt())
|
|
Scope = LScopes.findInlinedScope(DebugLoc::getFromDILocation(IA));
|
|
else
|
|
Scope = LScopes.findLexicalScope(cast<MDNode>(DV->getOperand(1)));
|
|
}
|
|
}
|
|
// If variable scope is not found then skip this variable.
|
|
if (!Scope)
|
|
continue;
|
|
|
|
Processed.insert(DV);
|
|
assert(MInsn->isDebugValue() && "History must begin with debug value");
|
|
DbgVariable *AbsVar = findAbstractVariable(DV, MInsn->getDebugLoc());
|
|
DbgVariable *RegVar = new DbgVariable(DV, AbsVar);
|
|
if (!addCurrentFnArgument(MF, RegVar, Scope))
|
|
addScopeVariable(Scope, RegVar);
|
|
if (AbsVar)
|
|
AbsVar->setMInsn(MInsn);
|
|
|
|
// Simple ranges that are fully coalesced.
|
|
if (History.size() <= 1 || (History.size() == 2 &&
|
|
MInsn->isIdenticalTo(History.back()))) {
|
|
RegVar->setMInsn(MInsn);
|
|
continue;
|
|
}
|
|
|
|
// handle multiple DBG_VALUE instructions describing one variable.
|
|
RegVar->setDotDebugLocOffset(DotDebugLocEntries.size());
|
|
|
|
for (SmallVectorImpl<const MachineInstr*>::const_iterator
|
|
HI = History.begin(), HE = History.end(); HI != HE; ++HI) {
|
|
const MachineInstr *Begin = *HI;
|
|
assert(Begin->isDebugValue() && "Invalid History entry");
|
|
|
|
// Check if DBG_VALUE is truncating a range.
|
|
if (Begin->getNumOperands() > 1 && Begin->getOperand(0).isReg()
|
|
&& !Begin->getOperand(0).getReg())
|
|
continue;
|
|
|
|
// Compute the range for a register location.
|
|
const MCSymbol *FLabel = getLabelBeforeInsn(Begin);
|
|
const MCSymbol *SLabel = 0;
|
|
|
|
if (HI + 1 == HE)
|
|
// If Begin is the last instruction in History then its value is valid
|
|
// until the end of the function.
|
|
SLabel = FunctionEndSym;
|
|
else {
|
|
const MachineInstr *End = HI[1];
|
|
DEBUG(dbgs() << "DotDebugLoc Pair:\n"
|
|
<< "\t" << *Begin << "\t" << *End << "\n");
|
|
if (End->isDebugValue())
|
|
SLabel = getLabelBeforeInsn(End);
|
|
else {
|
|
// End is a normal instruction clobbering the range.
|
|
SLabel = getLabelAfterInsn(End);
|
|
assert(SLabel && "Forgot label after clobber instruction");
|
|
++HI;
|
|
}
|
|
}
|
|
|
|
// The value is valid until the next DBG_VALUE or clobber.
|
|
DotDebugLocEntries.push_back(getDebugLocEntry(Asm, FLabel, SLabel, Begin));
|
|
}
|
|
DotDebugLocEntries.push_back(DotDebugLocEntry());
|
|
}
|
|
|
|
// Collect info for variables that were optimized out.
|
|
LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
|
|
DIArray Variables = DISubprogram(FnScope->getScopeNode()).getVariables();
|
|
for (unsigned i = 0, e = Variables.getNumElements(); i != e; ++i) {
|
|
DIVariable DV(Variables.getElement(i));
|
|
if (!DV || !DV.Verify() || !Processed.insert(DV))
|
|
continue;
|
|
if (LexicalScope *Scope = LScopes.findLexicalScope(DV.getContext()))
|
|
addScopeVariable(Scope, new DbgVariable(DV, NULL));
|
|
}
|
|
}
|
|
|
|
/// getLabelBeforeInsn - Return Label preceding the instruction.
|
|
const MCSymbol *DwarfDebug::getLabelBeforeInsn(const MachineInstr *MI) {
|
|
MCSymbol *Label = LabelsBeforeInsn.lookup(MI);
|
|
assert(Label && "Didn't insert label before instruction");
|
|
return Label;
|
|
}
|
|
|
|
/// getLabelAfterInsn - Return Label immediately following the instruction.
|
|
const MCSymbol *DwarfDebug::getLabelAfterInsn(const MachineInstr *MI) {
|
|
return LabelsAfterInsn.lookup(MI);
|
|
}
|
|
|
|
/// beginInstruction - Process beginning of an instruction.
|
|
void DwarfDebug::beginInstruction(const MachineInstr *MI) {
|
|
// Check if source location changes, but ignore DBG_VALUE locations.
|
|
if (!MI->isDebugValue()) {
|
|
DebugLoc DL = MI->getDebugLoc();
|
|
if (DL != PrevInstLoc && (!DL.isUnknown() || UnknownLocations)) {
|
|
unsigned Flags = DWARF2_FLAG_IS_STMT;
|
|
PrevInstLoc = DL;
|
|
if (DL == PrologEndLoc) {
|
|
Flags |= DWARF2_FLAG_PROLOGUE_END;
|
|
PrologEndLoc = DebugLoc();
|
|
}
|
|
if (!DL.isUnknown()) {
|
|
const MDNode *Scope = DL.getScope(Asm->MF->getFunction()->getContext());
|
|
recordSourceLine(DL.getLine(), DL.getCol(), Scope, Flags);
|
|
} else
|
|
recordSourceLine(0, 0, 0, 0);
|
|
}
|
|
}
|
|
|
|
// Insert labels where requested.
|
|
DenseMap<const MachineInstr*, MCSymbol*>::iterator I =
|
|
LabelsBeforeInsn.find(MI);
|
|
|
|
// No label needed.
|
|
if (I == LabelsBeforeInsn.end())
|
|
return;
|
|
|
|
// Label already assigned.
|
|
if (I->second)
|
|
return;
|
|
|
|
if (!PrevLabel) {
|
|
PrevLabel = MMI->getContext().CreateTempSymbol();
|
|
Asm->OutStreamer.EmitLabel(PrevLabel);
|
|
}
|
|
I->second = PrevLabel;
|
|
}
|
|
|
|
/// endInstruction - Process end of an instruction.
|
|
void DwarfDebug::endInstruction(const MachineInstr *MI) {
|
|
// Don't create a new label after DBG_VALUE instructions.
|
|
// They don't generate code.
|
|
if (!MI->isDebugValue())
|
|
PrevLabel = 0;
|
|
|
|
DenseMap<const MachineInstr*, MCSymbol*>::iterator I =
|
|
LabelsAfterInsn.find(MI);
|
|
|
|
// No label needed.
|
|
if (I == LabelsAfterInsn.end())
|
|
return;
|
|
|
|
// Label already assigned.
|
|
if (I->second)
|
|
return;
|
|
|
|
// We need a label after this instruction.
|
|
if (!PrevLabel) {
|
|
PrevLabel = MMI->getContext().CreateTempSymbol();
|
|
Asm->OutStreamer.EmitLabel(PrevLabel);
|
|
}
|
|
I->second = PrevLabel;
|
|
}
|
|
|
|
/// identifyScopeMarkers() -
|
|
/// Each LexicalScope has first instruction and last instruction to mark
|
|
/// beginning and end of a scope respectively. Create an inverse map that list
|
|
/// scopes starts (and ends) with an instruction. One instruction may start (or
|
|
/// end) multiple scopes. Ignore scopes that are not reachable.
|
|
void DwarfDebug::identifyScopeMarkers() {
|
|
SmallVector<LexicalScope *, 4> WorkList;
|
|
WorkList.push_back(LScopes.getCurrentFunctionScope());
|
|
while (!WorkList.empty()) {
|
|
LexicalScope *S = WorkList.pop_back_val();
|
|
|
|
const SmallVector<LexicalScope *, 4> &Children = S->getChildren();
|
|
if (!Children.empty())
|
|
for (SmallVector<LexicalScope *, 4>::const_iterator SI = Children.begin(),
|
|
SE = Children.end(); SI != SE; ++SI)
|
|
WorkList.push_back(*SI);
|
|
|
|
if (S->isAbstractScope())
|
|
continue;
|
|
|
|
const SmallVector<InsnRange, 4> &Ranges = S->getRanges();
|
|
if (Ranges.empty())
|
|
continue;
|
|
for (SmallVector<InsnRange, 4>::const_iterator RI = Ranges.begin(),
|
|
RE = Ranges.end(); RI != RE; ++RI) {
|
|
assert(RI->first && "InsnRange does not have first instruction!");
|
|
assert(RI->second && "InsnRange does not have second instruction!");
|
|
requestLabelBeforeInsn(RI->first);
|
|
requestLabelAfterInsn(RI->second);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// getScopeNode - Get MDNode for DebugLoc's scope.
|
|
static MDNode *getScopeNode(DebugLoc DL, const LLVMContext &Ctx) {
|
|
if (MDNode *InlinedAt = DL.getInlinedAt(Ctx))
|
|
return getScopeNode(DebugLoc::getFromDILocation(InlinedAt), Ctx);
|
|
return DL.getScope(Ctx);
|
|
}
|
|
|
|
/// getFnDebugLoc - Walk up the scope chain of given debug loc and find
|
|
/// line number info for the function.
|
|
static DebugLoc getFnDebugLoc(DebugLoc DL, const LLVMContext &Ctx) {
|
|
const MDNode *Scope = getScopeNode(DL, Ctx);
|
|
DISubprogram SP = getDISubprogram(Scope);
|
|
if (SP.Verify())
|
|
return DebugLoc::get(SP.getLineNumber(), 0, SP);
|
|
return DebugLoc();
|
|
}
|
|
|
|
/// beginFunction - Gather pre-function debug information. Assumes being
|
|
/// emitted immediately after the function entry point.
|
|
void DwarfDebug::beginFunction(const MachineFunction *MF) {
|
|
if (!MMI->hasDebugInfo()) return;
|
|
LScopes.initialize(*MF);
|
|
if (LScopes.empty()) return;
|
|
identifyScopeMarkers();
|
|
|
|
FunctionBeginSym = Asm->GetTempSymbol("func_begin",
|
|
Asm->getFunctionNumber());
|
|
// Assumes in correct section after the entry point.
|
|
Asm->OutStreamer.EmitLabel(FunctionBeginSym);
|
|
|
|
assert(UserVariables.empty() && DbgValues.empty() && "Maps weren't cleaned");
|
|
|
|
const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
|
|
/// LiveUserVar - Map physreg numbers to the MDNode they contain.
|
|
std::vector<const MDNode*> LiveUserVar(TRI->getNumRegs());
|
|
|
|
for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
|
|
I != E; ++I) {
|
|
bool AtBlockEntry = true;
|
|
for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
|
|
II != IE; ++II) {
|
|
const MachineInstr *MI = II;
|
|
|
|
if (MI->isDebugValue()) {
|
|
assert(MI->getNumOperands() > 1 && "Invalid machine instruction!");
|
|
|
|
// Keep track of user variables.
|
|
const MDNode *Var =
|
|
MI->getOperand(MI->getNumOperands() - 1).getMetadata();
|
|
|
|
// Variable is in a register, we need to check for clobbers.
|
|
if (isDbgValueInDefinedReg(MI))
|
|
LiveUserVar[MI->getOperand(0).getReg()] = Var;
|
|
|
|
// Check the history of this variable.
|
|
SmallVectorImpl<const MachineInstr*> &History = DbgValues[Var];
|
|
if (History.empty()) {
|
|
UserVariables.push_back(Var);
|
|
// The first mention of a function argument gets the FunctionBeginSym
|
|
// label, so arguments are visible when breaking at function entry.
|
|
DIVariable DV(Var);
|
|
if (DV.Verify() && DV.getTag() == dwarf::DW_TAG_arg_variable &&
|
|
DISubprogram(getDISubprogram(DV.getContext()))
|
|
.describes(MF->getFunction()))
|
|
LabelsBeforeInsn[MI] = FunctionBeginSym;
|
|
} else {
|
|
// We have seen this variable before. Try to coalesce DBG_VALUEs.
|
|
const MachineInstr *Prev = History.back();
|
|
if (Prev->isDebugValue()) {
|
|
// Coalesce identical entries at the end of History.
|
|
if (History.size() >= 2 &&
|
|
Prev->isIdenticalTo(History[History.size() - 2])) {
|
|
DEBUG(dbgs() << "Coalesce identical DBG_VALUE entries:\n"
|
|
<< "\t" << *Prev
|
|
<< "\t" << *History[History.size() - 2] << "\n");
|
|
History.pop_back();
|
|
}
|
|
|
|
// Terminate old register assignments that don't reach MI;
|
|
MachineFunction::const_iterator PrevMBB = Prev->getParent();
|
|
if (PrevMBB != I && (!AtBlockEntry || llvm::next(PrevMBB) != I) &&
|
|
isDbgValueInDefinedReg(Prev)) {
|
|
// Previous register assignment needs to terminate at the end of
|
|
// its basic block.
|
|
MachineBasicBlock::const_iterator LastMI =
|
|
PrevMBB->getLastNonDebugInstr();
|
|
if (LastMI == PrevMBB->end()) {
|
|
// Drop DBG_VALUE for empty range.
|
|
DEBUG(dbgs() << "Drop DBG_VALUE for empty range:\n"
|
|
<< "\t" << *Prev << "\n");
|
|
History.pop_back();
|
|
}
|
|
else {
|
|
// Terminate after LastMI.
|
|
History.push_back(LastMI);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
History.push_back(MI);
|
|
} else {
|
|
// Not a DBG_VALUE instruction.
|
|
if (!MI->isLabel())
|
|
AtBlockEntry = false;
|
|
|
|
// First known non DBG_VALUE location marks beginning of function
|
|
// body.
|
|
if (PrologEndLoc.isUnknown() && !MI->getDebugLoc().isUnknown())
|
|
PrologEndLoc = MI->getDebugLoc();
|
|
|
|
// Check if the instruction clobbers any registers with debug vars.
|
|
for (MachineInstr::const_mop_iterator MOI = MI->operands_begin(),
|
|
MOE = MI->operands_end(); MOI != MOE; ++MOI) {
|
|
if (!MOI->isReg() || !MOI->isDef() || !MOI->getReg())
|
|
continue;
|
|
for (const unsigned *AI = TRI->getOverlaps(MOI->getReg());
|
|
unsigned Reg = *AI; ++AI) {
|
|
const MDNode *Var = LiveUserVar[Reg];
|
|
if (!Var)
|
|
continue;
|
|
// Reg is now clobbered.
|
|
LiveUserVar[Reg] = 0;
|
|
|
|
// Was MD last defined by a DBG_VALUE referring to Reg?
|
|
DbgValueHistoryMap::iterator HistI = DbgValues.find(Var);
|
|
if (HistI == DbgValues.end())
|
|
continue;
|
|
SmallVectorImpl<const MachineInstr*> &History = HistI->second;
|
|
if (History.empty())
|
|
continue;
|
|
const MachineInstr *Prev = History.back();
|
|
// Sanity-check: Register assignments are terminated at the end of
|
|
// their block.
|
|
if (!Prev->isDebugValue() || Prev->getParent() != MI->getParent())
|
|
continue;
|
|
// Is the variable still in Reg?
|
|
if (!isDbgValueInDefinedReg(Prev) ||
|
|
Prev->getOperand(0).getReg() != Reg)
|
|
continue;
|
|
// Var is clobbered. Make sure the next instruction gets a label.
|
|
History.push_back(MI);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
for (DbgValueHistoryMap::iterator I = DbgValues.begin(), E = DbgValues.end();
|
|
I != E; ++I) {
|
|
SmallVectorImpl<const MachineInstr*> &History = I->second;
|
|
if (History.empty())
|
|
continue;
|
|
|
|
// Make sure the final register assignments are terminated.
|
|
const MachineInstr *Prev = History.back();
|
|
if (Prev->isDebugValue() && isDbgValueInDefinedReg(Prev)) {
|
|
const MachineBasicBlock *PrevMBB = Prev->getParent();
|
|
MachineBasicBlock::const_iterator LastMI =
|
|
PrevMBB->getLastNonDebugInstr();
|
|
if (LastMI == PrevMBB->end())
|
|
// Drop DBG_VALUE for empty range.
|
|
History.pop_back();
|
|
else {
|
|
// Terminate after LastMI.
|
|
History.push_back(LastMI);
|
|
}
|
|
}
|
|
// Request labels for the full history.
|
|
for (unsigned i = 0, e = History.size(); i != e; ++i) {
|
|
const MachineInstr *MI = History[i];
|
|
if (MI->isDebugValue())
|
|
requestLabelBeforeInsn(MI);
|
|
else
|
|
requestLabelAfterInsn(MI);
|
|
}
|
|
}
|
|
|
|
PrevInstLoc = DebugLoc();
|
|
PrevLabel = FunctionBeginSym;
|
|
|
|
// Record beginning of function.
|
|
if (!PrologEndLoc.isUnknown()) {
|
|
DebugLoc FnStartDL = getFnDebugLoc(PrologEndLoc,
|
|
MF->getFunction()->getContext());
|
|
recordSourceLine(FnStartDL.getLine(), FnStartDL.getCol(),
|
|
FnStartDL.getScope(MF->getFunction()->getContext()),
|
|
DWARF2_FLAG_IS_STMT);
|
|
}
|
|
}
|
|
|
|
void DwarfDebug::addScopeVariable(LexicalScope *LS, DbgVariable *Var) {
|
|
// SmallVector<DbgVariable *, 8> &Vars = ScopeVariables.lookup(LS);
|
|
ScopeVariables[LS].push_back(Var);
|
|
// Vars.push_back(Var);
|
|
}
|
|
|
|
/// endFunction - Gather and emit post-function debug information.
|
|
///
|
|
void DwarfDebug::endFunction(const MachineFunction *MF) {
|
|
if (!MMI->hasDebugInfo() || LScopes.empty()) return;
|
|
|
|
// Define end label for subprogram.
|
|
FunctionEndSym = Asm->GetTempSymbol("func_end",
|
|
Asm->getFunctionNumber());
|
|
// Assumes in correct section after the entry point.
|
|
Asm->OutStreamer.EmitLabel(FunctionEndSym);
|
|
|
|
SmallPtrSet<const MDNode *, 16> ProcessedVars;
|
|
collectVariableInfo(MF, ProcessedVars);
|
|
|
|
LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
|
|
CompileUnit *TheCU = SPMap.lookup(FnScope->getScopeNode());
|
|
assert(TheCU && "Unable to find compile unit!");
|
|
|
|
// Construct abstract scopes.
|
|
ArrayRef<LexicalScope *> AList = LScopes.getAbstractScopesList();
|
|
for (unsigned i = 0, e = AList.size(); i != e; ++i) {
|
|
LexicalScope *AScope = AList[i];
|
|
DISubprogram SP(AScope->getScopeNode());
|
|
if (SP.Verify()) {
|
|
// Collect info for variables that were optimized out.
|
|
DIArray Variables = SP.getVariables();
|
|
for (unsigned i = 0, e = Variables.getNumElements(); i != e; ++i) {
|
|
DIVariable DV(Variables.getElement(i));
|
|
if (!DV || !DV.Verify() || !ProcessedVars.insert(DV))
|
|
continue;
|
|
if (LexicalScope *Scope = LScopes.findAbstractScope(DV.getContext()))
|
|
addScopeVariable(Scope, new DbgVariable(DV, NULL));
|
|
}
|
|
}
|
|
if (ProcessedSPNodes.count(AScope->getScopeNode()) == 0)
|
|
constructScopeDIE(TheCU, AScope);
|
|
}
|
|
|
|
DIE *CurFnDIE = constructScopeDIE(TheCU, FnScope);
|
|
|
|
if (!DisableFramePointerElim(*MF))
|
|
TheCU->addUInt(CurFnDIE, dwarf::DW_AT_APPLE_omit_frame_ptr,
|
|
dwarf::DW_FORM_flag, 1);
|
|
|
|
DebugFrames.push_back(FunctionDebugFrameInfo(Asm->getFunctionNumber(),
|
|
MMI->getFrameMoves()));
|
|
|
|
// Clear debug info
|
|
for (DenseMap<LexicalScope *, SmallVector<DbgVariable *, 8> >::iterator
|
|
I = ScopeVariables.begin(), E = ScopeVariables.end(); I != E; ++I)
|
|
DeleteContainerPointers(I->second);
|
|
ScopeVariables.clear();
|
|
DeleteContainerPointers(CurrentFnArguments);
|
|
UserVariables.clear();
|
|
DbgValues.clear();
|
|
AbstractVariables.clear();
|
|
LabelsBeforeInsn.clear();
|
|
LabelsAfterInsn.clear();
|
|
PrevLabel = NULL;
|
|
}
|
|
|
|
/// recordSourceLine - Register a source line with debug info. Returns the
|
|
/// unique label that was emitted and which provides correspondence to
|
|
/// the source line list.
|
|
void DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, const MDNode *S,
|
|
unsigned Flags) {
|
|
StringRef Fn;
|
|
StringRef Dir;
|
|
unsigned Src = 1;
|
|
if (S) {
|
|
DIDescriptor Scope(S);
|
|
|
|
if (Scope.isCompileUnit()) {
|
|
DICompileUnit CU(S);
|
|
Fn = CU.getFilename();
|
|
Dir = CU.getDirectory();
|
|
} else if (Scope.isFile()) {
|
|
DIFile F(S);
|
|
Fn = F.getFilename();
|
|
Dir = F.getDirectory();
|
|
} else if (Scope.isSubprogram()) {
|
|
DISubprogram SP(S);
|
|
Fn = SP.getFilename();
|
|
Dir = SP.getDirectory();
|
|
} else if (Scope.isLexicalBlockFile()) {
|
|
DILexicalBlockFile DBF(S);
|
|
Fn = DBF.getFilename();
|
|
Dir = DBF.getDirectory();
|
|
} else if (Scope.isLexicalBlock()) {
|
|
DILexicalBlock DB(S);
|
|
Fn = DB.getFilename();
|
|
Dir = DB.getDirectory();
|
|
} else
|
|
assert(0 && "Unexpected scope info");
|
|
|
|
Src = GetOrCreateSourceID(Fn, Dir);
|
|
}
|
|
Asm->OutStreamer.EmitDwarfLocDirective(Src, Line, Col, Flags, 0, 0, Fn);
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
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// Emit Methods
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//===----------------------------------------------------------------------===//
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/// computeSizeAndOffset - Compute the size and offset of a DIE.
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///
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unsigned
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DwarfDebug::computeSizeAndOffset(DIE *Die, unsigned Offset, bool Last) {
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// Get the children.
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const std::vector<DIE *> &Children = Die->getChildren();
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// If not last sibling and has children then add sibling offset attribute.
|
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if (!Last && !Children.empty())
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Die->addSiblingOffset(DIEValueAllocator);
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// Record the abbreviation.
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assignAbbrevNumber(Die->getAbbrev());
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// Get the abbreviation for this DIE.
|
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unsigned AbbrevNumber = Die->getAbbrevNumber();
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const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
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// Set DIE offset
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Die->setOffset(Offset);
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// Start the size with the size of abbreviation code.
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Offset += MCAsmInfo::getULEB128Size(AbbrevNumber);
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const SmallVector<DIEValue*, 32> &Values = Die->getValues();
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const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
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// Size the DIE attribute values.
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for (unsigned i = 0, N = Values.size(); i < N; ++i)
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// Size attribute value.
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Offset += Values[i]->SizeOf(Asm, AbbrevData[i].getForm());
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// Size the DIE children if any.
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if (!Children.empty()) {
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assert(Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes &&
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"Children flag not set");
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for (unsigned j = 0, M = Children.size(); j < M; ++j)
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Offset = computeSizeAndOffset(Children[j], Offset, (j + 1) == M);
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// End of children marker.
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Offset += sizeof(int8_t);
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}
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Die->setSize(Offset - Die->getOffset());
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return Offset;
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}
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/// computeSizeAndOffsets - Compute the size and offset of all the DIEs.
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///
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void DwarfDebug::computeSizeAndOffsets() {
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for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
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E = CUMap.end(); I != E; ++I) {
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// Compute size of compile unit header.
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unsigned Offset =
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sizeof(int32_t) + // Length of Compilation Unit Info
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sizeof(int16_t) + // DWARF version number
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sizeof(int32_t) + // Offset Into Abbrev. Section
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sizeof(int8_t); // Pointer Size (in bytes)
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computeSizeAndOffset(I->second->getCUDie(), Offset, true);
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}
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}
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/// EmitSectionSym - Switch to the specified MCSection and emit an assembler
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/// temporary label to it if SymbolStem is specified.
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static MCSymbol *EmitSectionSym(AsmPrinter *Asm, const MCSection *Section,
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const char *SymbolStem = 0) {
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Asm->OutStreamer.SwitchSection(Section);
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if (!SymbolStem) return 0;
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MCSymbol *TmpSym = Asm->GetTempSymbol(SymbolStem);
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Asm->OutStreamer.EmitLabel(TmpSym);
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return TmpSym;
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}
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/// EmitSectionLabels - Emit initial Dwarf sections with a label at
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/// the start of each one.
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void DwarfDebug::EmitSectionLabels() {
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const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
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// Dwarf sections base addresses.
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DwarfInfoSectionSym =
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EmitSectionSym(Asm, TLOF.getDwarfInfoSection(), "section_info");
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DwarfAbbrevSectionSym =
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EmitSectionSym(Asm, TLOF.getDwarfAbbrevSection(), "section_abbrev");
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EmitSectionSym(Asm, TLOF.getDwarfARangesSection());
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if (const MCSection *MacroInfo = TLOF.getDwarfMacroInfoSection())
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EmitSectionSym(Asm, MacroInfo);
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EmitSectionSym(Asm, TLOF.getDwarfLineSection(), "section_line");
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EmitSectionSym(Asm, TLOF.getDwarfLocSection());
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EmitSectionSym(Asm, TLOF.getDwarfPubNamesSection());
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EmitSectionSym(Asm, TLOF.getDwarfPubTypesSection());
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DwarfStrSectionSym =
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EmitSectionSym(Asm, TLOF.getDwarfStrSection(), "section_str");
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DwarfDebugRangeSectionSym = EmitSectionSym(Asm, TLOF.getDwarfRangesSection(),
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"debug_range");
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DwarfDebugLocSectionSym = EmitSectionSym(Asm, TLOF.getDwarfLocSection(),
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"section_debug_loc");
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TextSectionSym = EmitSectionSym(Asm, TLOF.getTextSection(), "text_begin");
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EmitSectionSym(Asm, TLOF.getDataSection());
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}
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/// emitDIE - Recursively emits a debug information entry.
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///
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void DwarfDebug::emitDIE(DIE *Die) {
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// Get the abbreviation for this DIE.
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unsigned AbbrevNumber = Die->getAbbrevNumber();
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const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
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// Emit the code (index) for the abbreviation.
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if (Asm->isVerbose())
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Asm->OutStreamer.AddComment("Abbrev [" + Twine(AbbrevNumber) + "] 0x" +
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Twine::utohexstr(Die->getOffset()) + ":0x" +
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Twine::utohexstr(Die->getSize()) + " " +
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dwarf::TagString(Abbrev->getTag()));
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Asm->EmitULEB128(AbbrevNumber);
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const SmallVector<DIEValue*, 32> &Values = Die->getValues();
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const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
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// Emit the DIE attribute values.
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for (unsigned i = 0, N = Values.size(); i < N; ++i) {
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unsigned Attr = AbbrevData[i].getAttribute();
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unsigned Form = AbbrevData[i].getForm();
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assert(Form && "Too many attributes for DIE (check abbreviation)");
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if (Asm->isVerbose())
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Asm->OutStreamer.AddComment(dwarf::AttributeString(Attr));
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switch (Attr) {
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case dwarf::DW_AT_sibling:
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Asm->EmitInt32(Die->getSiblingOffset());
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break;
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case dwarf::DW_AT_abstract_origin: {
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DIEEntry *E = cast<DIEEntry>(Values[i]);
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DIE *Origin = E->getEntry();
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unsigned Addr = Origin->getOffset();
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Asm->EmitInt32(Addr);
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break;
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}
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case dwarf::DW_AT_ranges: {
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// DW_AT_range Value encodes offset in debug_range section.
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DIEInteger *V = cast<DIEInteger>(Values[i]);
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if (Asm->MAI->doesDwarfUsesLabelOffsetForRanges()) {
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Asm->EmitLabelPlusOffset(DwarfDebugRangeSectionSym,
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V->getValue(),
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4);
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} else {
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Asm->EmitLabelOffsetDifference(DwarfDebugRangeSectionSym,
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V->getValue(),
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DwarfDebugRangeSectionSym,
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4);
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}
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break;
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}
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case dwarf::DW_AT_location: {
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if (DIELabel *L = dyn_cast<DIELabel>(Values[i]))
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Asm->EmitLabelDifference(L->getValue(), DwarfDebugLocSectionSym, 4);
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else
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Values[i]->EmitValue(Asm, Form);
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break;
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}
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case dwarf::DW_AT_accessibility: {
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if (Asm->isVerbose()) {
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DIEInteger *V = cast<DIEInteger>(Values[i]);
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Asm->OutStreamer.AddComment(dwarf::AccessibilityString(V->getValue()));
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}
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Values[i]->EmitValue(Asm, Form);
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break;
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}
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default:
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// Emit an attribute using the defined form.
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Values[i]->EmitValue(Asm, Form);
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break;
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}
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}
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// Emit the DIE children if any.
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if (Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes) {
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const std::vector<DIE *> &Children = Die->getChildren();
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for (unsigned j = 0, M = Children.size(); j < M; ++j)
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emitDIE(Children[j]);
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if (Asm->isVerbose())
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Asm->OutStreamer.AddComment("End Of Children Mark");
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Asm->EmitInt8(0);
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}
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}
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/// emitDebugInfo - Emit the debug info section.
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///
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void DwarfDebug::emitDebugInfo() {
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// Start debug info section.
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Asm->OutStreamer.SwitchSection(
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Asm->getObjFileLowering().getDwarfInfoSection());
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for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
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E = CUMap.end(); I != E; ++I) {
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CompileUnit *TheCU = I->second;
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DIE *Die = TheCU->getCUDie();
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// Emit the compile units header.
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Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("info_begin",
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TheCU->getID()));
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// Emit size of content not including length itself
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unsigned ContentSize = Die->getSize() +
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sizeof(int16_t) + // DWARF version number
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sizeof(int32_t) + // Offset Into Abbrev. Section
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sizeof(int8_t); // Pointer Size (in bytes)
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Asm->OutStreamer.AddComment("Length of Compilation Unit Info");
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Asm->EmitInt32(ContentSize);
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Asm->OutStreamer.AddComment("DWARF version number");
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Asm->EmitInt16(dwarf::DWARF_VERSION);
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Asm->OutStreamer.AddComment("Offset Into Abbrev. Section");
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Asm->EmitSectionOffset(Asm->GetTempSymbol("abbrev_begin"),
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DwarfAbbrevSectionSym);
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Asm->OutStreamer.AddComment("Address Size (in bytes)");
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Asm->EmitInt8(Asm->getTargetData().getPointerSize());
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emitDIE(Die);
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Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("info_end", TheCU->getID()));
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}
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}
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/// emitAbbreviations - Emit the abbreviation section.
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///
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void DwarfDebug::emitAbbreviations() const {
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// Check to see if it is worth the effort.
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if (!Abbreviations.empty()) {
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// Start the debug abbrev section.
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Asm->OutStreamer.SwitchSection(
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Asm->getObjFileLowering().getDwarfAbbrevSection());
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Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("abbrev_begin"));
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// For each abbrevation.
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for (unsigned i = 0, N = Abbreviations.size(); i < N; ++i) {
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// Get abbreviation data
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const DIEAbbrev *Abbrev = Abbreviations[i];
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// Emit the abbrevations code (base 1 index.)
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Asm->EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
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// Emit the abbreviations data.
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Abbrev->Emit(Asm);
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}
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// Mark end of abbreviations.
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Asm->EmitULEB128(0, "EOM(3)");
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Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("abbrev_end"));
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}
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}
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/// emitEndOfLineMatrix - Emit the last address of the section and the end of
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/// the line matrix.
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///
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void DwarfDebug::emitEndOfLineMatrix(unsigned SectionEnd) {
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// Define last address of section.
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Asm->OutStreamer.AddComment("Extended Op");
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Asm->EmitInt8(0);
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Asm->OutStreamer.AddComment("Op size");
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Asm->EmitInt8(Asm->getTargetData().getPointerSize() + 1);
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Asm->OutStreamer.AddComment("DW_LNE_set_address");
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Asm->EmitInt8(dwarf::DW_LNE_set_address);
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Asm->OutStreamer.AddComment("Section end label");
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Asm->OutStreamer.EmitSymbolValue(Asm->GetTempSymbol("section_end",SectionEnd),
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Asm->getTargetData().getPointerSize(),
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0/*AddrSpace*/);
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// Mark end of matrix.
|
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Asm->OutStreamer.AddComment("DW_LNE_end_sequence");
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Asm->EmitInt8(0);
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Asm->EmitInt8(1);
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Asm->EmitInt8(1);
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}
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/// emitDebugPubNames - Emit visible names into a debug pubnames section.
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///
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void DwarfDebug::emitDebugPubNames() {
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for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
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E = CUMap.end(); I != E; ++I) {
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CompileUnit *TheCU = I->second;
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// Start the dwarf pubnames section.
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Asm->OutStreamer.SwitchSection(
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Asm->getObjFileLowering().getDwarfPubNamesSection());
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Asm->OutStreamer.AddComment("Length of Public Names Info");
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Asm->EmitLabelDifference(
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Asm->GetTempSymbol("pubnames_end", TheCU->getID()),
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Asm->GetTempSymbol("pubnames_begin", TheCU->getID()), 4);
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Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_begin",
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TheCU->getID()));
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Asm->OutStreamer.AddComment("DWARF Version");
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Asm->EmitInt16(dwarf::DWARF_VERSION);
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|
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Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
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Asm->EmitSectionOffset(Asm->GetTempSymbol("info_begin", TheCU->getID()),
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DwarfInfoSectionSym);
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Asm->OutStreamer.AddComment("Compilation Unit Length");
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Asm->EmitLabelDifference(Asm->GetTempSymbol("info_end", TheCU->getID()),
|
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Asm->GetTempSymbol("info_begin", TheCU->getID()),
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4);
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|
|
|
const StringMap<DIE*> &Globals = TheCU->getGlobals();
|
|
for (StringMap<DIE*>::const_iterator
|
|
GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
|
|
const char *Name = GI->getKeyData();
|
|
DIE *Entity = GI->second;
|
|
|
|
Asm->OutStreamer.AddComment("DIE offset");
|
|
Asm->EmitInt32(Entity->getOffset());
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|
|
|
if (Asm->isVerbose())
|
|
Asm->OutStreamer.AddComment("External Name");
|
|
Asm->OutStreamer.EmitBytes(StringRef(Name, strlen(Name)+1), 0);
|
|
}
|
|
|
|
Asm->OutStreamer.AddComment("End Mark");
|
|
Asm->EmitInt32(0);
|
|
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_end",
|
|
TheCU->getID()));
|
|
}
|
|
}
|
|
|
|
void DwarfDebug::emitDebugPubTypes() {
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for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
|
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E = CUMap.end(); I != E; ++I) {
|
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CompileUnit *TheCU = I->second;
|
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// Start the dwarf pubnames section.
|
|
Asm->OutStreamer.SwitchSection(
|
|
Asm->getObjFileLowering().getDwarfPubTypesSection());
|
|
Asm->OutStreamer.AddComment("Length of Public Types Info");
|
|
Asm->EmitLabelDifference(
|
|
Asm->GetTempSymbol("pubtypes_end", TheCU->getID()),
|
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Asm->GetTempSymbol("pubtypes_begin", TheCU->getID()), 4);
|
|
|
|
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubtypes_begin",
|
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TheCU->getID()));
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|
|
|
if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DWARF Version");
|
|
Asm->EmitInt16(dwarf::DWARF_VERSION);
|
|
|
|
Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
|
|
Asm->EmitSectionOffset(Asm->GetTempSymbol("info_begin", TheCU->getID()),
|
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DwarfInfoSectionSym);
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|
|
|
Asm->OutStreamer.AddComment("Compilation Unit Length");
|
|
Asm->EmitLabelDifference(Asm->GetTempSymbol("info_end", TheCU->getID()),
|
|
Asm->GetTempSymbol("info_begin", TheCU->getID()),
|
|
4);
|
|
|
|
const StringMap<DIE*> &Globals = TheCU->getGlobalTypes();
|
|
for (StringMap<DIE*>::const_iterator
|
|
GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
|
|
const char *Name = GI->getKeyData();
|
|
DIE *Entity = GI->second;
|
|
|
|
if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DIE offset");
|
|
Asm->EmitInt32(Entity->getOffset());
|
|
|
|
if (Asm->isVerbose()) Asm->OutStreamer.AddComment("External Name");
|
|
Asm->OutStreamer.EmitBytes(StringRef(Name, GI->getKeyLength()+1), 0);
|
|
}
|
|
|
|
Asm->OutStreamer.AddComment("End Mark");
|
|
Asm->EmitInt32(0);
|
|
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubtypes_end",
|
|
TheCU->getID()));
|
|
}
|
|
}
|
|
|
|
/// emitDebugStr - Emit visible names into a debug str section.
|
|
///
|
|
void DwarfDebug::emitDebugStr() {
|
|
// Check to see if it is worth the effort.
|
|
if (StringPool.empty()) return;
|
|
|
|
// Start the dwarf str section.
|
|
Asm->OutStreamer.SwitchSection(
|
|
Asm->getObjFileLowering().getDwarfStrSection());
|
|
|
|
// Get all of the string pool entries and put them in an array by their ID so
|
|
// we can sort them.
|
|
SmallVector<std::pair<unsigned,
|
|
StringMapEntry<std::pair<MCSymbol*, unsigned> >*>, 64> Entries;
|
|
|
|
for (StringMap<std::pair<MCSymbol*, unsigned> >::iterator
|
|
I = StringPool.begin(), E = StringPool.end(); I != E; ++I)
|
|
Entries.push_back(std::make_pair(I->second.second, &*I));
|
|
|
|
array_pod_sort(Entries.begin(), Entries.end());
|
|
|
|
for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
|
|
// Emit a label for reference from debug information entries.
|
|
Asm->OutStreamer.EmitLabel(Entries[i].second->getValue().first);
|
|
|
|
// Emit the string itself.
|
|
Asm->OutStreamer.EmitBytes(Entries[i].second->getKey(), 0/*addrspace*/);
|
|
}
|
|
}
|
|
|
|
/// emitDebugLoc - Emit visible names into a debug loc section.
|
|
///
|
|
void DwarfDebug::emitDebugLoc() {
|
|
if (DotDebugLocEntries.empty())
|
|
return;
|
|
|
|
for (SmallVector<DotDebugLocEntry, 4>::iterator
|
|
I = DotDebugLocEntries.begin(), E = DotDebugLocEntries.end();
|
|
I != E; ++I) {
|
|
DotDebugLocEntry &Entry = *I;
|
|
if (I + 1 != DotDebugLocEntries.end())
|
|
Entry.Merge(I+1);
|
|
}
|
|
|
|
// Start the dwarf loc section.
|
|
Asm->OutStreamer.SwitchSection(
|
|
Asm->getObjFileLowering().getDwarfLocSection());
|
|
unsigned char Size = Asm->getTargetData().getPointerSize();
|
|
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", 0));
|
|
unsigned index = 1;
|
|
for (SmallVector<DotDebugLocEntry, 4>::iterator
|
|
I = DotDebugLocEntries.begin(), E = DotDebugLocEntries.end();
|
|
I != E; ++I, ++index) {
|
|
DotDebugLocEntry &Entry = *I;
|
|
if (Entry.isMerged()) continue;
|
|
if (Entry.isEmpty()) {
|
|
Asm->OutStreamer.EmitIntValue(0, Size, /*addrspace*/0);
|
|
Asm->OutStreamer.EmitIntValue(0, Size, /*addrspace*/0);
|
|
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_loc", index));
|
|
} else {
|
|
Asm->OutStreamer.EmitSymbolValue(Entry.Begin, Size, 0);
|
|
Asm->OutStreamer.EmitSymbolValue(Entry.End, Size, 0);
|
|
DIVariable DV(Entry.Variable);
|
|
Asm->OutStreamer.AddComment("Loc expr size");
|
|
MCSymbol *begin = Asm->OutStreamer.getContext().CreateTempSymbol();
|
|
MCSymbol *end = Asm->OutStreamer.getContext().CreateTempSymbol();
|
|
Asm->EmitLabelDifference(end, begin, 2);
|
|
Asm->OutStreamer.EmitLabel(begin);
|
|
if (Entry.isInt()) {
|
|
DIBasicType BTy(DV.getType());
|
|
if (BTy.Verify() &&
|
|
(BTy.getEncoding() == dwarf::DW_ATE_signed
|
|
|| BTy.getEncoding() == dwarf::DW_ATE_signed_char)) {
|
|
Asm->OutStreamer.AddComment("DW_OP_consts");
|
|
Asm->EmitInt8(dwarf::DW_OP_consts);
|
|
Asm->EmitSLEB128(Entry.getInt());
|
|
} else {
|
|
Asm->OutStreamer.AddComment("DW_OP_constu");
|
|
Asm->EmitInt8(dwarf::DW_OP_constu);
|
|
Asm->EmitULEB128(Entry.getInt());
|
|
}
|
|
} else if (Entry.isLocation()) {
|
|
if (!DV.hasComplexAddress())
|
|
// Regular entry.
|
|
Asm->EmitDwarfRegOp(Entry.Loc);
|
|
else {
|
|
// Complex address entry.
|
|
unsigned N = DV.getNumAddrElements();
|
|
unsigned i = 0;
|
|
if (N >= 2 && DV.getAddrElement(0) == DIBuilder::OpPlus) {
|
|
if (Entry.Loc.getOffset()) {
|
|
i = 2;
|
|
Asm->EmitDwarfRegOp(Entry.Loc);
|
|
Asm->OutStreamer.AddComment("DW_OP_deref");
|
|
Asm->EmitInt8(dwarf::DW_OP_deref);
|
|
Asm->OutStreamer.AddComment("DW_OP_plus_uconst");
|
|
Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
|
|
Asm->EmitSLEB128(DV.getAddrElement(1));
|
|
} else {
|
|
// If first address element is OpPlus then emit
|
|
// DW_OP_breg + Offset instead of DW_OP_reg + Offset.
|
|
MachineLocation Loc(Entry.Loc.getReg(), DV.getAddrElement(1));
|
|
Asm->EmitDwarfRegOp(Loc);
|
|
i = 2;
|
|
}
|
|
} else {
|
|
Asm->EmitDwarfRegOp(Entry.Loc);
|
|
}
|
|
|
|
// Emit remaining complex address elements.
|
|
for (; i < N; ++i) {
|
|
uint64_t Element = DV.getAddrElement(i);
|
|
if (Element == DIBuilder::OpPlus) {
|
|
Asm->EmitInt8(dwarf::DW_OP_plus_uconst);
|
|
Asm->EmitULEB128(DV.getAddrElement(++i));
|
|
} else if (Element == DIBuilder::OpDeref)
|
|
Asm->EmitInt8(dwarf::DW_OP_deref);
|
|
else llvm_unreachable("unknown Opcode found in complex address");
|
|
}
|
|
}
|
|
}
|
|
// else ... ignore constant fp. There is not any good way to
|
|
// to represent them here in dwarf.
|
|
Asm->OutStreamer.EmitLabel(end);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// EmitDebugARanges - Emit visible names into a debug aranges section.
|
|
///
|
|
void DwarfDebug::EmitDebugARanges() {
|
|
// Start the dwarf aranges section.
|
|
Asm->OutStreamer.SwitchSection(
|
|
Asm->getObjFileLowering().getDwarfARangesSection());
|
|
}
|
|
|
|
/// emitDebugRanges - Emit visible names into a debug ranges section.
|
|
///
|
|
void DwarfDebug::emitDebugRanges() {
|
|
// Start the dwarf ranges section.
|
|
Asm->OutStreamer.SwitchSection(
|
|
Asm->getObjFileLowering().getDwarfRangesSection());
|
|
unsigned char Size = Asm->getTargetData().getPointerSize();
|
|
for (SmallVector<const MCSymbol *, 8>::iterator
|
|
I = DebugRangeSymbols.begin(), E = DebugRangeSymbols.end();
|
|
I != E; ++I) {
|
|
if (*I)
|
|
Asm->OutStreamer.EmitSymbolValue(const_cast<MCSymbol*>(*I), Size, 0);
|
|
else
|
|
Asm->OutStreamer.EmitIntValue(0, Size, /*addrspace*/0);
|
|
}
|
|
}
|
|
|
|
/// emitDebugMacInfo - Emit visible names into a debug macinfo section.
|
|
///
|
|
void DwarfDebug::emitDebugMacInfo() {
|
|
if (const MCSection *LineInfo =
|
|
Asm->getObjFileLowering().getDwarfMacroInfoSection()) {
|
|
// Start the dwarf macinfo section.
|
|
Asm->OutStreamer.SwitchSection(LineInfo);
|
|
}
|
|
}
|
|
|
|
/// emitDebugInlineInfo - Emit inline info using following format.
|
|
/// Section Header:
|
|
/// 1. length of section
|
|
/// 2. Dwarf version number
|
|
/// 3. address size.
|
|
///
|
|
/// Entries (one "entry" for each function that was inlined):
|
|
///
|
|
/// 1. offset into __debug_str section for MIPS linkage name, if exists;
|
|
/// otherwise offset into __debug_str for regular function name.
|
|
/// 2. offset into __debug_str section for regular function name.
|
|
/// 3. an unsigned LEB128 number indicating the number of distinct inlining
|
|
/// instances for the function.
|
|
///
|
|
/// The rest of the entry consists of a {die_offset, low_pc} pair for each
|
|
/// inlined instance; the die_offset points to the inlined_subroutine die in the
|
|
/// __debug_info section, and the low_pc is the starting address for the
|
|
/// inlining instance.
|
|
void DwarfDebug::emitDebugInlineInfo() {
|
|
if (!Asm->MAI->doesDwarfUsesInlineInfoSection())
|
|
return;
|
|
|
|
if (!FirstCU)
|
|
return;
|
|
|
|
Asm->OutStreamer.SwitchSection(
|
|
Asm->getObjFileLowering().getDwarfDebugInlineSection());
|
|
|
|
Asm->OutStreamer.AddComment("Length of Debug Inlined Information Entry");
|
|
Asm->EmitLabelDifference(Asm->GetTempSymbol("debug_inlined_end", 1),
|
|
Asm->GetTempSymbol("debug_inlined_begin", 1), 4);
|
|
|
|
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_inlined_begin", 1));
|
|
|
|
Asm->OutStreamer.AddComment("Dwarf Version");
|
|
Asm->EmitInt16(dwarf::DWARF_VERSION);
|
|
Asm->OutStreamer.AddComment("Address Size (in bytes)");
|
|
Asm->EmitInt8(Asm->getTargetData().getPointerSize());
|
|
|
|
for (SmallVector<const MDNode *, 4>::iterator I = InlinedSPNodes.begin(),
|
|
E = InlinedSPNodes.end(); I != E; ++I) {
|
|
|
|
const MDNode *Node = *I;
|
|
DenseMap<const MDNode *, SmallVector<InlineInfoLabels, 4> >::iterator II
|
|
= InlineInfo.find(Node);
|
|
SmallVector<InlineInfoLabels, 4> &Labels = II->second;
|
|
DISubprogram SP(Node);
|
|
StringRef LName = SP.getLinkageName();
|
|
StringRef Name = SP.getName();
|
|
|
|
Asm->OutStreamer.AddComment("MIPS linkage name");
|
|
if (LName.empty()) {
|
|
Asm->OutStreamer.EmitBytes(Name, 0);
|
|
Asm->OutStreamer.EmitIntValue(0, 1, 0); // nul terminator.
|
|
} else
|
|
Asm->EmitSectionOffset(getStringPoolEntry(getRealLinkageName(LName)),
|
|
DwarfStrSectionSym);
|
|
|
|
Asm->OutStreamer.AddComment("Function name");
|
|
Asm->EmitSectionOffset(getStringPoolEntry(Name), DwarfStrSectionSym);
|
|
Asm->EmitULEB128(Labels.size(), "Inline count");
|
|
|
|
for (SmallVector<InlineInfoLabels, 4>::iterator LI = Labels.begin(),
|
|
LE = Labels.end(); LI != LE; ++LI) {
|
|
if (Asm->isVerbose()) Asm->OutStreamer.AddComment("DIE offset");
|
|
Asm->EmitInt32(LI->second->getOffset());
|
|
|
|
if (Asm->isVerbose()) Asm->OutStreamer.AddComment("low_pc");
|
|
Asm->OutStreamer.EmitSymbolValue(LI->first,
|
|
Asm->getTargetData().getPointerSize(),0);
|
|
}
|
|
}
|
|
|
|
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_inlined_end", 1));
|
|
}
|