390 lines
12 KiB
C++
390 lines
12 KiB
C++
//===- Core/YamlWriter.cpp - Writes YAML ----------------------------------===//
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//
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// The LLVM Linker
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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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#include "YamlKeyValues.h"
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#include "lld/Core/YamlWriter.h"
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#include "lld/Core/Atom.h"
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#include "lld/Core/File.h"
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#include "lld/Core/Reference.h"
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#include "llvm/ADT/OwningPtr.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/system_error.h"
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#include <vector>
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namespace lld {
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namespace yaml {
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namespace {
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///
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/// In most cases, atoms names are unambiguous, so references can just
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/// use the atom name as the target (e.g. target: foo). But in a few
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/// cases that does not work, so ref-names are added. These are labels
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/// used only in yaml. The labels do not exist in the Atom model.
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///
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/// One need for ref-names are when atoms have no user supplied name
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/// (e.g. c-string literal). Another case is when two object files with
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/// identically named static functions are merged (ld -r) into one object file.
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/// In that case referencing the function by name is ambiguous, so a unique
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/// ref-name is added.
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///
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class RefNameBuilder : public File::AtomHandler,
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public DefinedAtom::ReferenceHandler {
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public:
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RefNameBuilder() { }
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virtual void doReference(const Reference& ref) {
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// create refname for any unnamed reference target
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if ( ref.target()->name().empty() ) {
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char* buffer;
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asprintf(&buffer, "L%03d", _unnamedCounter++);
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_refNames[ref.target()] = buffer;
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}
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}
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virtual void doFile(const File &) { }
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virtual void doDefinedAtom(const DefinedAtom& atom) {
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// Build map of atoms names to detect duplicates
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if ( ! atom.name().empty() )
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buildDuplicateNameMap(atom);
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// Find references to unnamed atoms and create ref-names for them.
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_unnamedCounter = 0;
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atom.forEachReference(*this);
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}
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virtual void doUndefinedAtom(const UndefinedAtom& atom) {
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buildDuplicateNameMap(atom);
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}
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void buildDuplicateNameMap(const Atom& atom) {
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assert(!atom.name().empty());
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NameToAtom::iterator pos = _nameMap.find(atom.name());
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if ( pos != _nameMap.end() ) {
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// Found name collision, give each a unique ref-name.
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char* buffer;
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asprintf(&buffer, "%s.%03d", atom.name().data(), ++_collisionCount);
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_refNames[&atom] = buffer;
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const Atom* prevAtom = pos->second;
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AtomToRefName::iterator pos2 = _refNames.find(prevAtom);
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if ( pos2 == _refNames.end() ) {
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// only create ref-name for previous if none already created
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asprintf(&buffer, "%s.%03d", prevAtom->name().data(), ++_collisionCount);
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_refNames[prevAtom] = buffer;
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}
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}
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else {
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// First time we've seen this name, just add it to map.
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_nameMap[atom.name()] = &atom;
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}
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}
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bool hasRefName(const Atom* atom) {
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return _refNames.count(atom);
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}
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const char* refName(const Atom* atom) {
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return _refNames.find(atom)->second;
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}
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private:
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struct MyMappingInfo {
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static llvm::StringRef getEmptyKey() { return llvm::StringRef(); }
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static llvm::StringRef getTombstoneKey() { return llvm::StringRef(" ", 0); }
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static unsigned getHashValue(llvm::StringRef const val) {
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return llvm::HashString(val); }
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static bool isEqual(llvm::StringRef const lhs,
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llvm::StringRef const rhs) { return lhs.equals(rhs); }
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};
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typedef llvm::DenseMap<llvm::StringRef, const Atom*, MyMappingInfo> NameToAtom;
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typedef llvm::DenseMap<const Atom*, const char*> AtomToRefName;
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unsigned int _collisionCount;
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unsigned int _unnamedCounter;
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NameToAtom _nameMap;
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AtomToRefName _refNames;
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};
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///
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/// Helper class for writeObjectText() to write out atoms in yaml format.
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///
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class AtomWriter : public File::AtomHandler,
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public DefinedAtom::ReferenceHandler {
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public:
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AtomWriter(RefNameBuilder& rnb, llvm::raw_ostream &out)
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: _out(out), _rnb(rnb), _firstAtom(true) { }
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virtual void doFile(const class File &) { _firstAtom = true; }
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virtual void doDefinedAtom(const class DefinedAtom &atom) {
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// add blank line between atoms for readability
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if ( !_firstAtom )
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_out << "\n";
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_firstAtom = false;
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bool hasDash = false;
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if ( !atom.name().empty() ) {
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_out << " - "
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<< KeyValues::nameKeyword
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<< ":"
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<< spacePadding(KeyValues::nameKeyword)
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<< atom.name()
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<< "\n";
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hasDash = true;
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}
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if ( _rnb.hasRefName(&atom) ) {
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_out << (hasDash ? " " : " - ")
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<< KeyValues::refNameKeyword
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<< ":"
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<< spacePadding(KeyValues::refNameKeyword)
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<< _rnb.refName(&atom)
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<< "\n";
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hasDash = true;
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}
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if ( atom.definition() != KeyValues::definitionDefault ) {
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_out << (hasDash ? " " : " - ")
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<< KeyValues::definitionKeyword
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<< ":"
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<< spacePadding(KeyValues::definitionKeyword)
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<< KeyValues::definition(atom.definition())
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<< "\n";
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hasDash = true;
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}
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if ( atom.scope() != KeyValues::scopeDefault ) {
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_out << (hasDash ? " " : " - ")
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<< KeyValues::scopeKeyword
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<< ":"
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<< spacePadding(KeyValues::scopeKeyword)
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<< KeyValues::scope(atom.scope())
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<< "\n";
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hasDash = true;
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}
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if ( atom.interposable() != KeyValues::interposableDefault ) {
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_out << " "
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<< KeyValues::interposableKeyword
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<< ":"
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<< spacePadding(KeyValues::interposableKeyword)
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<< KeyValues::interposable(atom.interposable())
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<< "\n";
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}
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if ( atom.merge() != KeyValues::mergeDefault ) {
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_out << " "
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<< KeyValues::mergeKeyword
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<< ":"
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<< spacePadding(KeyValues::mergeKeyword)
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<< KeyValues::merge(atom.merge())
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<< "\n";
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}
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if ( atom.contentType() != KeyValues::contentTypeDefault ) {
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_out << " "
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<< KeyValues::contentTypeKeyword
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<< ":"
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<< spacePadding(KeyValues::contentTypeKeyword)
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<< KeyValues::contentType(atom.contentType())
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<< "\n";
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}
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if ( atom.deadStrip() != KeyValues::deadStripKindDefault ) {
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_out << " "
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<< KeyValues::deadStripKindKeyword
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<< ":"
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<< spacePadding(KeyValues::deadStripKindKeyword)
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<< KeyValues::deadStripKind(atom.deadStrip())
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<< "\n";
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}
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if ( atom.sectionChoice() != KeyValues::sectionChoiceDefault ) {
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_out << " "
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<< KeyValues::sectionChoiceKeyword
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<< ":"
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<< spacePadding(KeyValues::sectionChoiceKeyword)
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<< KeyValues::sectionChoice(atom.sectionChoice())
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<< "\n";
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assert( ! atom.customSectionName().empty() );
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_out << " "
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<< KeyValues::sectionNameKeyword
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<< ":"
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<< spacePadding(KeyValues::sectionNameKeyword)
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<< atom.customSectionName()
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<< "\n";
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}
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if ( atom.isThumb() != KeyValues::isThumbDefault ) {
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_out << " "
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<< KeyValues::isThumbKeyword
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<< ":"
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<< spacePadding(KeyValues::isThumbKeyword)
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<< KeyValues::isThumb(atom.isThumb())
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<< "\n";
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}
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if ( atom.isAlias() != KeyValues::isAliasDefault ) {
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_out << " "
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<< KeyValues::isAliasKeyword
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<< ":"
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<< spacePadding(KeyValues::isAliasKeyword)
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<< KeyValues::isAlias(atom.isAlias())
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<< "\n";
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}
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if ( (atom.contentType() != DefinedAtom::typeZeroFill)
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&& (atom.size() != 0) ) {
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_out << " "
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<< KeyValues::contentKeyword
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<< ":"
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<< spacePadding(KeyValues::contentKeyword)
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<< "[ ";
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llvm::ArrayRef<uint8_t> arr = atom.rawContent();
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bool needComma = false;
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for (unsigned int i=0; i < arr.size(); ++i) {
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if ( needComma )
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_out << ", ";
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_out << hexdigit(arr[i] >> 4);
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_out << hexdigit(arr[i] & 0x0F);
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needComma = true;
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}
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_out << " ]\n";
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}
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_wroteFirstFixup = false;
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atom.forEachReference(*this);
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}
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virtual void doReference(const Reference& ref) {
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if ( !_wroteFirstFixup ) {
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_out << " fixups:\n";
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_wroteFirstFixup = true;
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}
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_out << " - "
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<< KeyValues::fixupsOffsetKeyword
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<< ":"
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<< spacePadding(KeyValues::fixupsOffsetKeyword)
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<< ref.offsetInAtom()
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<< "\n";
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_out << " "
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<< KeyValues::fixupsKindKeyword
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<< ":"
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<< spacePadding(KeyValues::fixupsKindKeyword)
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<< ref.kind()
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<< "\n";
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const Atom* target = ref.target();
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if ( target != NULL ) {
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llvm::StringRef refName = target->name();
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if ( _rnb.hasRefName(target) )
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refName = _rnb.refName(target);
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assert(!refName.empty());
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_out << " "
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<< KeyValues::fixupsTargetKeyword
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<< ":"
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<< spacePadding(KeyValues::fixupsTargetKeyword)
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<< refName
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<< "\n";
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}
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if ( ref.addend() != 0 ) {
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_out << " "
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<< KeyValues::fixupsAddendKeyword
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<< ":"
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<< spacePadding(KeyValues::fixupsAddendKeyword)
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<< ref.addend()
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<< "\n";
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}
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}
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virtual void doUndefinedAtom(const class UndefinedAtom &atom) {
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// add blank line between atoms for readability
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if ( !_firstAtom )
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_out << "\n";
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_firstAtom = false;
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_out << " - "
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<< KeyValues::nameKeyword
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<< ":"
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<< spacePadding(KeyValues::nameKeyword)
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<< atom.name()
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<< "\n";
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_out << " "
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<< KeyValues::definitionKeyword
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<< ":"
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<< spacePadding(KeyValues::definitionKeyword)
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<< KeyValues::definition(atom.definition())
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<< "\n";
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if ( atom.weakImport() != KeyValues::weakImportDefault ) {
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_out << " "
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<< KeyValues::weakImportKeyword
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<< ":"
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<< spacePadding(KeyValues::weakImportKeyword)
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<< KeyValues::weakImport(atom.weakImport())
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<< "\n";
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}
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}
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private:
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// return a string of the correct number of spaces to align value
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const char* spacePadding(const char* key) {
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const char* spaces = " ";
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assert(strlen(spaces) > strlen(key));
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return &spaces[strlen(key)];
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}
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char hexdigit(uint8_t nibble) {
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if ( nibble < 0x0A )
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return '0' + nibble;
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else
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return 'A' + nibble - 0x0A;
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}
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llvm::raw_ostream& _out;
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RefNameBuilder _rnb;
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bool _firstAtom;
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bool _wroteFirstFixup;
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};
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} // anonymous namespace
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///
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/// writeObjectText - writes the lld::File object as in YAML
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/// format to the specified stream.
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///
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void writeObjectText(const File &file, llvm::raw_ostream &out) {
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// Figure what ref-name labels are needed
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RefNameBuilder rnb;
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file.forEachAtom(rnb);
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// Write out all atoms
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AtomWriter h(rnb, out);
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out << "---\n";
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out << "atoms:\n";
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file.forEachAtom(h);
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out << "...\n";
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}
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} // namespace yaml
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} // namespace lld
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