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Reland "[yaml2obj][ELF] - Simplify the code that performs sections validation."

This reverts commit 1b589f4d4db27e3fcd81fdc5abeb9407753ab790 and relands the D89463
with the fix: update `MappingTraits<FileFilter>::validate()` in ClangTidyOptions.cpp to
match the new signature (change the return type to "std::string" from "StringRef").

Original commit message:

This:

Changes the return type of MappingTraits<T>>::validate to std::string
instead of StringRef. It allows to create more complex error messages.

It introduces std::vector<std::pair<StringRef, bool>> getEntries():
a new virtual method of Section, which is the base class for all sections.
It returns names of special section specific keys (e.g. "Entries") and flags that says if them exist in a YAML.
The code in validate() uses this list of entries descriptions to generalize validation.
This approach was discussed in the D89039 thread.

Differential revision: https://reviews.llvm.org/D89463
This commit is contained in:
Georgii Rymar 2020-10-20 16:01:01 +03:00
parent d0cd8409eb
commit d93677f652
11 changed files with 138 additions and 147 deletions

View File

@ -359,7 +359,7 @@ struct MappingTraits<DWARFYAML::ListTable<EntryType>> {
template <typename EntryType>
struct MappingTraits<DWARFYAML::ListEntries<EntryType>> {
static void mapping(IO &IO, DWARFYAML::ListEntries<EntryType> &ListEntries);
static StringRef validate(IO &IO,
static std::string validate(IO &IO,
DWARFYAML::ListEntries<EntryType> &ListEntries);
};

View File

@ -193,6 +193,13 @@ struct Section : public Chunk {
static bool classof(const Chunk *S) { return S->Kind != ChunkKind::Fill; }
// Some derived sections might have their own special entries. This method
// returns a vector of <entry name, is used> pairs. It is used for section
// validation.
virtual std::vector<std::pair<StringRef, bool>> getEntries() const {
return {};
};
// The following members are used to override section fields which is
// useful for creating invalid objects.
@ -235,6 +242,10 @@ struct StackSizesSection : Section {
StackSizesSection() : Section(ChunkKind::StackSizes) {}
std::vector<std::pair<StringRef, bool>> getEntries() const override {
return {{"Entries", Entries.hasValue()}};
};
static bool classof(const Chunk *S) {
return S->Kind == ChunkKind::StackSizes;
}
@ -249,6 +260,10 @@ struct DynamicSection : Section {
DynamicSection() : Section(ChunkKind::Dynamic) {}
std::vector<std::pair<StringRef, bool>> getEntries() const override {
return {{"Entries", Entries.hasValue()}};
};
static bool classof(const Chunk *S) { return S->Kind == ChunkKind::Dynamic; }
};
@ -276,6 +291,10 @@ struct NoteSection : Section {
NoteSection() : Section(ChunkKind::Note) {}
std::vector<std::pair<StringRef, bool>> getEntries() const override {
return {{"Notes", Notes.hasValue()}};
};
static bool classof(const Chunk *S) { return S->Kind == ChunkKind::Note; }
};
@ -283,6 +302,10 @@ struct HashSection : Section {
Optional<std::vector<uint32_t>> Bucket;
Optional<std::vector<uint32_t>> Chain;
std::vector<std::pair<StringRef, bool>> getEntries() const override {
return {{"Bucket", Bucket.hasValue()}, {"Chain", Chain.hasValue()}};
};
// The following members are used to override section fields.
// This is useful for creating invalid objects.
Optional<llvm::yaml::Hex64> NBucket;
@ -321,6 +344,13 @@ struct GnuHashSection : Section {
GnuHashSection() : Section(ChunkKind::GnuHash) {}
std::vector<std::pair<StringRef, bool>> getEntries() const override {
return {{"Header", Header.hasValue()},
{"BloomFilter", BloomFilter.hasValue()},
{"HashBuckets", HashBuckets.hasValue()},
{"HashValues", HashValues.hasValue()}};
};
static bool classof(const Chunk *S) { return S->Kind == ChunkKind::GnuHash; }
};
@ -343,6 +373,10 @@ struct VerneedSection : Section {
VerneedSection() : Section(ChunkKind::Verneed) {}
std::vector<std::pair<StringRef, bool>> getEntries() const override {
return {{"Dependencies", VerneedV.hasValue()}};
};
static bool classof(const Chunk *S) {
return S->Kind == ChunkKind::Verneed;
}
@ -353,6 +387,10 @@ struct AddrsigSection : Section {
AddrsigSection() : Section(ChunkKind::Addrsig) {}
std::vector<std::pair<StringRef, bool>> getEntries() const override {
return {{"Symbols", Symbols.hasValue()}};
};
static bool classof(const Chunk *S) { return S->Kind == ChunkKind::Addrsig; }
};
@ -366,6 +404,10 @@ struct LinkerOptionsSection : Section {
LinkerOptionsSection() : Section(ChunkKind::LinkerOptions) {}
std::vector<std::pair<StringRef, bool>> getEntries() const override {
return {{"Options", Options.hasValue()}};
};
static bool classof(const Chunk *S) {
return S->Kind == ChunkKind::LinkerOptions;
}
@ -376,6 +418,10 @@ struct DependentLibrariesSection : Section {
DependentLibrariesSection() : Section(ChunkKind::DependentLibraries) {}
std::vector<std::pair<StringRef, bool>> getEntries() const override {
return {{"Libraries", Libs.hasValue()}};
};
static bool classof(const Chunk *S) {
return S->Kind == ChunkKind::DependentLibraries;
}
@ -396,6 +442,10 @@ struct CallGraphProfileSection : Section {
CallGraphProfileSection() : Section(ChunkKind::CallGraphProfile) {}
std::vector<std::pair<StringRef, bool>> getEntries() const override {
return {{"Entries", Entries.hasValue()}};
};
static bool classof(const Chunk *S) {
return S->Kind == ChunkKind::CallGraphProfile;
}
@ -406,6 +456,10 @@ struct SymverSection : Section {
SymverSection() : Section(ChunkKind::Symver) {}
std::vector<std::pair<StringRef, bool>> getEntries() const override {
return {{"Entries", Entries.hasValue()}};
};
static bool classof(const Chunk *S) { return S->Kind == ChunkKind::Symver; }
};
@ -424,6 +478,10 @@ struct VerdefSection : Section {
VerdefSection() : Section(ChunkKind::Verdef) {}
std::vector<std::pair<StringRef, bool>> getEntries() const override {
return {{"Entries", Entries.hasValue()}};
};
static bool classof(const Chunk *S) { return S->Kind == ChunkKind::Verdef; }
};
@ -435,6 +493,10 @@ struct GroupSection : Section {
GroupSection() : Section(ChunkKind::Group) {}
std::vector<std::pair<StringRef, bool>> getEntries() const override {
return {{"Members", Members.hasValue()}};
};
static bool classof(const Chunk *S) { return S->Kind == ChunkKind::Group; }
};
@ -451,6 +513,10 @@ struct RelocationSection : Section {
RelocationSection() : Section(ChunkKind::Relocation) {}
std::vector<std::pair<StringRef, bool>> getEntries() const override {
return {{"Relocations", Relocations.hasValue()}};
};
static bool classof(const Chunk *S) {
return S->Kind == ChunkKind::Relocation;
}
@ -461,6 +527,10 @@ struct RelrSection : Section {
RelrSection() : Section(ChunkKind::Relr) {}
std::vector<std::pair<StringRef, bool>> getEntries() const override {
return {{"Entries", Entries.hasValue()}};
};
static bool classof(const Chunk *S) {
return S->Kind == ChunkKind::Relr;
}
@ -471,6 +541,10 @@ struct SymtabShndxSection : Section {
SymtabShndxSection() : Section(ChunkKind::SymtabShndxSection) {}
std::vector<std::pair<StringRef, bool>> getEntries() const override {
return {{"Entries", Entries.hasValue()}};
};
static bool classof(const Chunk *S) {
return S->Kind == ChunkKind::SymtabShndxSection;
}
@ -486,6 +560,10 @@ struct ARMIndexTableSection : Section {
ARMIndexTableSection() : Section(ChunkKind::ARMIndexTable) {}
std::vector<std::pair<StringRef, bool>> getEntries() const override {
return {{"Entries", Entries.hasValue()}};
};
static bool classof(const Chunk *S) {
return S->Kind == ChunkKind::ARMIndexTable;
}
@ -699,7 +777,7 @@ struct MappingTraits<ELFYAML::FileHeader> {
template <> struct MappingTraits<ELFYAML::SectionHeaderTable> {
static void mapping(IO &IO, ELFYAML::SectionHeaderTable &SecHdrTable);
static StringRef validate(IO &IO, ELFYAML::SectionHeaderTable &SecHdrTable);
static std::string validate(IO &IO, ELFYAML::SectionHeaderTable &SecHdrTable);
};
template <> struct MappingTraits<ELFYAML::SectionHeader> {
@ -713,7 +791,7 @@ template <> struct MappingTraits<ELFYAML::ProgramHeader> {
template <>
struct MappingTraits<ELFYAML::Symbol> {
static void mapping(IO &IO, ELFYAML::Symbol &Symbol);
static StringRef validate(IO &IO, ELFYAML::Symbol &Symbol);
static std::string validate(IO &IO, ELFYAML::Symbol &Symbol);
};
template <> struct MappingTraits<ELFYAML::StackSizeEntry> {
@ -762,7 +840,7 @@ template <> struct MappingTraits<ELFYAML::ARMIndexTableEntry> {
template <> struct MappingTraits<std::unique_ptr<ELFYAML::Chunk>> {
static void mapping(IO &IO, std::unique_ptr<ELFYAML::Chunk> &C);
static StringRef validate(IO &io, std::unique_ptr<ELFYAML::Chunk> &C);
static std::string validate(IO &io, std::unique_ptr<ELFYAML::Chunk> &C);
};
template <>

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@ -220,7 +220,7 @@ template <> struct MappingTraits<MachOYAML::Relocation> {
template <> struct MappingTraits<MachOYAML::Section> {
static void mapping(IO &IO, MachOYAML::Section &Section);
static StringRef validate(IO &io, MachOYAML::Section &Section);
static std::string validate(IO &io, MachOYAML::Section &Section);
};
template <> struct MappingTraits<MachOYAML::NListEntry> {

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@ -236,7 +236,7 @@ template <> struct BlockScalarTraits<MinidumpYAML::BlockStringRef> {
template <> struct MappingTraits<std::unique_ptr<MinidumpYAML::Stream>> {
static void mapping(IO &IO, std::unique_ptr<MinidumpYAML::Stream> &S);
static StringRef validate(IO &IO, std::unique_ptr<MinidumpYAML::Stream> &S);
static std::string validate(IO &IO, std::unique_ptr<MinidumpYAML::Stream> &S);
};
template <> struct MappingContextTraits<minidump::MemoryDescriptor, BinaryRef> {

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@ -61,7 +61,7 @@ struct MappingTraits {
// Must provide:
// static void mapping(IO &io, T &fields);
// Optionally may provide:
// static StringRef validate(IO &io, T &fields);
// static std::string validate(IO &io, T &fields);
//
// The optional flow flag will cause generated YAML to use a flow mapping
// (e.g. { a: 0, b: 1 }):
@ -83,7 +83,7 @@ template <class T, class Context> struct MappingContextTraits {
// Must provide:
// static void mapping(IO &io, T &fields, Context &Ctx);
// Optionally may provide:
// static StringRef validate(IO &io, T &fields, Context &Ctx);
// static std::string validate(IO &io, T &fields, Context &Ctx);
//
// The optional flow flag will cause generated YAML to use a flow mapping
// (e.g. { a: 0, b: 1 }):
@ -421,7 +421,7 @@ template <class T> struct has_MappingTraits<T, EmptyContext> {
// Test if MappingContextTraits<T>::validate() is defined on type T.
template <class T, class Context> struct has_MappingValidateTraits {
using Signature_validate = StringRef (*)(class IO &, T &, Context &);
using Signature_validate = std::string (*)(class IO &, T &, Context &);
template <typename U>
static char test(SameType<Signature_validate, &U::validate>*);
@ -435,7 +435,7 @@ template <class T, class Context> struct has_MappingValidateTraits {
// Test if MappingTraits<T>::validate() is defined on type T.
template <class T> struct has_MappingValidateTraits<T, EmptyContext> {
using Signature_validate = StringRef (*)(class IO &, T &);
using Signature_validate = std::string (*)(class IO &, T &);
template <typename U>
static char test(SameType<Signature_validate, &U::validate> *);
@ -1041,7 +1041,7 @@ yamlize(IO &io, T &Val, bool, Context &Ctx) {
else
io.beginMapping();
if (io.outputting()) {
StringRef Err = MappingTraits<T>::validate(io, Val);
std::string Err = MappingTraits<T>::validate(io, Val);
if (!Err.empty()) {
errs() << Err << "\n";
assert(Err.empty() && "invalid struct trying to be written as yaml");
@ -1049,7 +1049,7 @@ yamlize(IO &io, T &Val, bool, Context &Ctx) {
}
detail::doMapping(io, Val, Ctx);
if (!io.outputting()) {
StringRef Err = MappingTraits<T>::validate(io, Val);
std::string Err = MappingTraits<T>::validate(io, Val);
if (!Err.empty())
io.setError(Err);
}

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@ -304,11 +304,11 @@ void MappingTraits<DWARFYAML::ListEntries<EntryType>>::mapping(
}
template <typename EntryType>
StringRef MappingTraits<DWARFYAML::ListEntries<EntryType>>::validate(
std::string MappingTraits<DWARFYAML::ListEntries<EntryType>>::validate(
IO &IO, DWARFYAML::ListEntries<EntryType> &ListEntries) {
if (ListEntries.Entries && ListEntries.Content)
return "Entries and Content can't be used together";
return StringRef();
return "";
}
template <typename EntryType>

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@ -864,14 +864,14 @@ void MappingTraits<ELFYAML::SectionHeaderTable>::mapping(
IO.mapOptional("NoHeaders", SectionHeader.NoHeaders);
}
StringRef MappingTraits<ELFYAML::SectionHeaderTable>::validate(
std::string MappingTraits<ELFYAML::SectionHeaderTable>::validate(
IO &IO, ELFYAML::SectionHeaderTable &SecHdrTable) {
if (SecHdrTable.NoHeaders && (SecHdrTable.Sections || SecHdrTable.Excluded))
return "NoHeaders can't be used together with Sections/Excluded";
if (!SecHdrTable.NoHeaders && !SecHdrTable.Sections && !SecHdrTable.Excluded)
return "SectionHeaderTable can't be empty. Use 'NoHeaders' key to drop the "
"section header table";
return StringRef();
return "";
}
void MappingTraits<ELFYAML::FileHeader>::mapping(IO &IO,
@ -1089,11 +1089,11 @@ void MappingTraits<ELFYAML::Symbol>::mapping(IO &IO, ELFYAML::Symbol &Symbol) {
IO.mapOptional("Other", Keys->Other);
}
StringRef MappingTraits<ELFYAML::Symbol>::validate(IO &IO,
std::string MappingTraits<ELFYAML::Symbol>::validate(IO &IO,
ELFYAML::Symbol &Symbol) {
if (Symbol.Index && Symbol.Section.data())
return "Index and Section cannot both be specified for Symbol";
return StringRef();
return "";
}
static void commonSectionMapping(IO &IO, ELFYAML::Section &Section) {
@ -1422,12 +1422,12 @@ void MappingTraits<std::unique_ptr<ELFYAML::Chunk>>::mapping(
}
}
StringRef MappingTraits<std::unique_ptr<ELFYAML::Chunk>>::validate(
std::string MappingTraits<std::unique_ptr<ELFYAML::Chunk>>::validate(
IO &io, std::unique_ptr<ELFYAML::Chunk> &C) {
if (const auto *F = dyn_cast<ELFYAML::Fill>(C.get())) {
if (F->Pattern && F->Pattern->binary_size() != 0 && !F->Size)
return "\"Size\" can't be 0 when \"Pattern\" is not empty";
return {};
return "";
}
const ELFYAML::Section &Sec = *cast<ELFYAML::Section>(C.get());
@ -1435,130 +1435,43 @@ StringRef MappingTraits<std::unique_ptr<ELFYAML::Chunk>>::validate(
(uint64_t)(*Sec.Size) < Sec.Content->binary_size())
return "Section size must be greater than or equal to the content size";
auto BuildErrPrefix = [](ArrayRef<std::pair<StringRef, bool>> EntV) {
std::string Msg;
for (size_t I = 0, E = EntV.size(); I != E; ++I) {
StringRef Name = EntV[I].first;
if (I == 0) {
Msg = "\"" + Name.str() + "\"";
continue;
}
if (I != EntV.size() - 1)
Msg += ", \"" + Name.str() + "\"";
else
Msg += " and \"" + Name.str() + "\"";
}
return Msg;
};
std::vector<std::pair<StringRef, bool>> Entries = Sec.getEntries();
const size_t NumUsedEntries = llvm::count_if(
Entries, [](const std::pair<StringRef, bool> &P) { return P.second; });
if ((Sec.Size || Sec.Content) && NumUsedEntries > 0)
return BuildErrPrefix(Entries) +
" cannot be used with \"Content\" or \"Size\"";
if (NumUsedEntries > 0 && Entries.size() != NumUsedEntries)
return BuildErrPrefix(Entries) + " must be used together";
if (const auto *RawSection = dyn_cast<ELFYAML::RawContentSection>(C.get())) {
if (RawSection->Flags && RawSection->ShFlags)
return "ShFlags and Flags cannot be used together";
return {};
}
if (const auto *SS = dyn_cast<ELFYAML::StackSizesSection>(C.get())) {
if ((SS->Content || SS->Size) && SS->Entries)
return "\"Entries\" cannot be used with \"Content\" or \"Size\"";
return {};
}
if (const auto *HS = dyn_cast<ELFYAML::HashSection>(C.get())) {
if ((HS->Content || HS->Size) && (HS->Bucket || HS->Chain))
return "\"Bucket\" and \"Chain\" cannot be used with \"Content\" or "
"\"Size\"";
if ((HS->Bucket && !HS->Chain) || (!HS->Bucket && HS->Chain))
return "\"Bucket\" and \"Chain\" must be used together";
return {};
}
if (const auto *Sec = dyn_cast<ELFYAML::AddrsigSection>(C.get())) {
if ((Sec->Content || Sec->Size) && Sec->Symbols)
return "\"Symbols\" cannot be used with \"Content\" or \"Size\"";
return {};
}
if (const auto *NS = dyn_cast<ELFYAML::NoteSection>(C.get())) {
if ((NS->Content || NS->Size) && NS->Notes)
return "\"Notes\" cannot be used with \"Content\" or \"Size\"";
return {};
}
if (const auto *Sec = dyn_cast<ELFYAML::GnuHashSection>(C.get())) {
const bool HasSpecialFields =
Sec->Header || Sec->BloomFilter || Sec->HashBuckets || Sec->HashValues;
if (HasSpecialFields && (Sec->Content || Sec->Size))
return "\"Header\", \"BloomFilter\", "
"\"HashBuckets\" and \"HashValues\" can't be used together with "
"\"Content\" or \"Size\"";
if (HasSpecialFields && (!Sec->Header || !Sec->BloomFilter ||
!Sec->HashBuckets || !Sec->HashValues))
return "\"Header\", \"BloomFilter\", "
"\"HashBuckets\" and \"HashValues\" must be used together";
return {};
}
if (const auto *Sec = dyn_cast<ELFYAML::LinkerOptionsSection>(C.get())) {
if ((Sec->Content || Sec->Size) && Sec->Options)
return "\"Options\" cannot be used with \"Content\" or \"Size\"";
return {};
}
if (const auto *Sec = dyn_cast<ELFYAML::DependentLibrariesSection>(C.get())) {
if ((Sec->Content || Sec->Size) && Sec->Libs)
return "\"Libraries\" cannot be used with \"Content\" or \"Size\"";
return {};
}
if (const auto *VD = dyn_cast<ELFYAML::VerdefSection>(C.get())) {
if ((VD->Content || VD->Size) && VD->Entries)
return "\"Entries\" cannot be used with \"Content\" or \"Size\"";
return {};
}
if (const auto *VN = dyn_cast<ELFYAML::VerneedSection>(C.get())) {
if ((VN->Content || VN->Size) && VN->VerneedV)
return "\"Dependencies\" cannot be used with \"Content\" or \"Size\"";
return {};
}
if (const auto *SV = dyn_cast<ELFYAML::SymverSection>(C.get())) {
if ((SV->Content || SV->Size) && SV->Entries)
return "\"Entries\" cannot be used with \"Content\" or \"Size\"";
return {};
}
if (const auto *RS = dyn_cast<ELFYAML::RelrSection>(C.get())) {
if ((RS->Content || RS->Size) && RS->Entries)
return "\"Entries\" cannot be used with \"Content\" or \"Size\"";
return {};
}
if (const auto *CGP = dyn_cast<ELFYAML::CallGraphProfileSection>(C.get())) {
if ((CGP->Content || CGP->Size) && CGP->Entries)
return "\"Entries\" cannot be used with \"Content\" or \"Size\"";
return {};
}
if (const auto *IT = dyn_cast<ELFYAML::ARMIndexTableSection>(C.get())) {
if ((IT->Content || IT->Size) && IT->Entries)
return "\"Entries\" cannot be used with \"Content\" or \"Size\"";
return {};
}
if (const auto *RS = dyn_cast<ELFYAML::RelocationSection>(C.get())) {
if ((RS->Content || RS->Size) && RS->Relocations)
return "\"Relocations\" cannot be used with \"Content\" or \"Size\"";
return {};
}
if (const auto *SS = dyn_cast<ELFYAML::SymtabShndxSection>(C.get())) {
if ((SS->Content || SS->Size) && SS->Entries)
return "\"Entries\" cannot be used with \"Content\" or \"Size\"";
return {};
}
if (const auto *GS = dyn_cast<ELFYAML::GroupSection>(C.get())) {
if ((GS->Content || GS->Size) && GS->Members)
return "\"Members\" cannot be used with \"Content\" or \"Size\"";
return {};
return "";
}
if (const auto *NB = dyn_cast<ELFYAML::NoBitsSection>(C.get())) {
if (NB->Content)
return "SHT_NOBITS section cannot have \"Content\"";
return {};
}
if (const auto *DS = dyn_cast<ELFYAML::DynamicSection>(C.get())) {
if ((DS->Content || DS->Size) && DS->Entries)
return "\"Entries\" cannot be used with \"Content\" or \"Size\"";
return {};
return "";
}
if (const auto *MF = dyn_cast<ELFYAML::MipsABIFlags>(C.get())) {
@ -1567,10 +1480,10 @@ StringRef MappingTraits<std::unique_ptr<ELFYAML::Chunk>>::validate(
"sections";
if (MF->Size)
return "\"Size\" key is not implemented for SHT_MIPS_ABIFLAGS sections";
return {};
return "";
}
return {};
return "";
}
namespace {

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@ -305,12 +305,12 @@ void MappingTraits<MachOYAML::Section>::mapping(IO &IO,
IO.mapOptional("relocations", Section.relocations);
}
StringRef
std::string
MappingTraits<MachOYAML::Section>::validate(IO &IO,
MachOYAML::Section &Section) {
if (Section.content && Section.size < Section.content->binary_size())
return "Section size must be greater than or equal to the content size";
return {};
return "";
}
void MappingTraits<MachO::build_tool_version>::mapping(

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@ -292,7 +292,7 @@ static void streamMapping(yaml::IO &IO, RawContentStream &Stream) {
IO.mapOptional("Size", Stream.Size, Stream.Content.binary_size());
}
static StringRef streamValidate(RawContentStream &Stream) {
static std::string streamValidate(RawContentStream &Stream) {
if (Stream.Size.value < Stream.Content.binary_size())
return "Stream size must be greater or equal to the content size";
return "";
@ -434,7 +434,7 @@ void yaml::MappingTraits<std::unique_ptr<Stream>>::mapping(
}
}
StringRef yaml::MappingTraits<std::unique_ptr<Stream>>::validate(
std::string yaml::MappingTraits<std::unique_ptr<Stream>>::validate(
yaml::IO &IO, std::unique_ptr<MinidumpYAML::Stream> &S) {
switch (S->Kind) {
case MinidumpYAML::Stream::StreamKind::RawContent:

View File

@ -231,7 +231,7 @@ Sections:
# RUN: not yaml2obj --docnum=11 -DCONTENT="" %s 2>&1 | FileCheck %s --check-prefix=TOGETHER
# RUN: not yaml2obj --docnum=11 -DSIZE=0 %s 2>&1 | FileCheck %s --check-prefix=TOGETHER
# TOGETHER: error: "Header", "BloomFilter", "HashBuckets" and "HashValues" can't be used together with "Content" or "Size"
# TOGETHER: error: "Header", "BloomFilter", "HashBuckets" and "HashValues" cannot be used with "Content" or "Size"
--- !ELF
FileHeader:

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@ -1782,10 +1782,10 @@ namespace yaml {
static void mapping(IO &io, MyValidation &d) {
io.mapRequired("value", d.value);
}
static StringRef validate(IO &io, MyValidation &d) {
static std::string validate(IO &io, MyValidation &d) {
if (d.value < 0)
return "negative value";
return StringRef();
return {};
}
};
}