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[WebAssembly] Add support for named data sections in wasm binaries

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Followup to https://reviews.llvm.org/D91769 which added support
for names globals.

Differential Revision: https://reviews.llvm.org/D92909
This commit is contained in:
Sam Clegg 2020-12-08 21:47:19 -08:00
parent 99ada595aa
commit cee0963ebc
6 changed files with 40 additions and 12 deletions
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10
include/llvm/BinaryFormat/Wasm.h
View File

@ -202,7 +202,8 @@ struct WasmSymbolInfo {
enum class NameType {
FUNCTION,
GLOBAL
GLOBAL,
DATA_SEGMENT,
};
struct WasmDebugName {
@ -313,9 +314,10 @@ enum : uint8_t {
// Kind codes used in the custom "name" section
enum : unsigned {
WASM_NAMES_FUNCTION = 0x1,
WASM_NAMES_LOCAL = 0x2,
WASM_NAMES_GLOBAL = 0x7,
WASM_NAMES_FUNCTION = 1,
WASM_NAMES_LOCAL = 2,
WASM_NAMES_GLOBAL = 7,
WASM_NAMES_DATA_SEGMENT = 9,
};
// Kind codes used in the custom "linking" section

1
include/llvm/ObjectYAML/WasmYAML.h
View File

@ -222,6 +222,7 @@ struct NameSection : CustomSection {
std::vector<NameEntry> FunctionNames;
std::vector<NameEntry> GlobalNames;
std::vector<NameEntry> DataSegmentNames;
};
struct LinkingSection : CustomSection {

21
lib/Object/WasmObjectFile.cpp
View File

@ -357,6 +357,7 @@ Error WasmObjectFile::parseDylinkSection(ReadContext &Ctx) {
Error WasmObjectFile::parseNameSection(ReadContext &Ctx) {
llvm::DenseSet<uint64_t> SeenFunctions;
llvm::DenseSet<uint64_t> SeenGlobals;
llvm::DenseSet<uint64_t> SeenSegments;
if (FunctionTypes.size() && !SeenCodeSection) {
return make_error<GenericBinaryError>("Names must come after code section",
object_error::parse_failed);
@ -368,11 +369,13 @@ Error WasmObjectFile::parseNameSection(ReadContext &Ctx) {
const uint8_t *SubSectionEnd = Ctx.Ptr + Size;
switch (Type) {
case wasm::WASM_NAMES_FUNCTION:
case wasm::WASM_NAMES_GLOBAL: {
case wasm::WASM_NAMES_GLOBAL:
case wasm::WASM_NAMES_DATA_SEGMENT: {
uint32_t Count = readVaruint32(Ctx);
while (Count--) {
uint32_t Index = readVaruint32(Ctx);
StringRef Name = readString(Ctx);
wasm::NameType nameType = wasm::NameType::FUNCTION;
if (Type == wasm::WASM_NAMES_FUNCTION) {
if (!SeenFunctions.insert(Index).second)
return make_error<GenericBinaryError>(
@ -383,18 +386,24 @@ Error WasmObjectFile::parseNameSection(ReadContext &Ctx) {
if (isDefinedFunctionIndex(Index))
getDefinedFunction(Index).DebugName = Name;
} else {
} else if (Type == wasm::WASM_NAMES_GLOBAL) {
nameType = wasm::NameType::GLOBAL;
if (!SeenGlobals.insert(Index).second)
return make_error<GenericBinaryError>("Global named more than once",
object_error::parse_failed);
if (!isValidGlobalIndex(Index) || Name.empty())
return make_error<GenericBinaryError>("Invalid name entry",
object_error::parse_failed);
} else {
nameType = wasm::NameType::DATA_SEGMENT;
if (!SeenSegments.insert(Index).second)
return make_error<GenericBinaryError>(
"Segment named more than once", object_error::parse_failed);
if (Index > DataSegments.size())
return make_error<GenericBinaryError>("Invalid named data segment",
object_error::parse_failed);
}
wasm::NameType T = Type == wasm::WASM_NAMES_FUNCTION
? wasm::NameType::FUNCTION
: wasm::NameType::GLOBAL;
DebugNames.push_back(wasm::WasmDebugName{T, Index, Name});
DebugNames.push_back(wasm::WasmDebugName{nameType, Index, Name});
}
break;
}

13
lib/ObjectYAML/WasmEmitter.cpp
View File

@ -281,6 +281,19 @@ void WasmWriter::writeSectionContent(raw_ostream &OS,
writeStringRef(NameEntry.Name, SubSection.getStream());
}
SubSection.done();
}
if (Section.DataSegmentNames.size()) {
writeUint8(OS, wasm::WASM_NAMES_DATA_SEGMENT);
SubSectionWriter SubSection(OS);
encodeULEB128(Section.DataSegmentNames.size(), SubSection.getStream());
for (const WasmYAML::NameEntry &NameEntry : Section.DataSegmentNames) {
encodeULEB128(NameEntry.Index, SubSection.getStream());
writeStringRef(NameEntry.Name, SubSection.getStream());
}
SubSection.done();
}
}

1
lib/ObjectYAML/WasmYAML.cpp
View File

@ -62,6 +62,7 @@ static void sectionMapping(IO &IO, WasmYAML::NameSection &Section) {
IO.mapRequired("Name", Section.Name);
IO.mapOptional("FunctionNames", Section.FunctionNames);
IO.mapOptional("GlobalNames", Section.GlobalNames);
IO.mapOptional("DataSegmentNames", Section.DataSegmentNames);
}
static void sectionMapping(IO &IO, WasmYAML::LinkingSection &Section) {

6
tools/obj2yaml/wasm2yaml.cpp
View File

@ -70,9 +70,11 @@ WasmDumper::dumpCustomSection(const WasmSection &WasmSec) {
NameEntry.Index = Name.Index;
if (Name.Type == llvm::wasm::NameType::FUNCTION) {
NameSec->FunctionNames.push_back(NameEntry);
} else {
assert(Name.Type == llvm::wasm::NameType::GLOBAL);
} else if (Name.Type == llvm::wasm::NameType::GLOBAL) {
NameSec->GlobalNames.push_back(NameEntry);
} else {
assert(Name.Type == llvm::wasm::NameType::DATA_SEGMENT);
NameSec->DataSegmentNames.push_back(NameEntry);
}
}
CustomSec = std::move(NameSec);