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[WebAssembly] Remove DataSize from linking metadata section

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Neither the linker nor the runtime need this information
anymore.  We were originally using this to model BSS size
but the plan is now to use the segment metadata to allow
for BSS segments.

Differential Revision: https://reviews.llvm.org/D41366

llvm-svn: 326267
This commit is contained in:
Sam Clegg 2018-02-27 23:57:37 +00:00
parent cbd1ba2fe2
commit b53932efa7
24 changed files with 3 additions and 43 deletions
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2
include/llvm/BinaryFormat/Wasm.h
View File

@ -158,7 +158,6 @@ struct WasmFunctionName {
};
struct WasmLinkingData {
uint32_t DataSize;
std::vector<WasmInitFunc> InitFunctions;
std::vector<WasmSymbolInfo> SymbolTable;
};
@ -227,7 +226,6 @@ enum : unsigned {
// Kind codes used in the custom "linking" section
enum : unsigned {
WASM_DATA_SIZE = 0x3,
WASM_SEGMENT_INFO = 0x5,
WASM_INIT_FUNCS = 0x6,
WASM_COMDAT_INFO = 0x7,

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

@ -195,7 +195,6 @@ struct LinkingSection : CustomSection {
return C && C->Name == "linking";
}
uint32_t DataSize;
std::vector<SymbolInfo> SymbolTable;
std::vector<SegmentInfo> SegmentInfos;
std::vector<InitFunction> InitFunctions;

12
lib/MC/WasmObjectWriter.cpp
View File

@ -274,7 +274,7 @@ private:
void writeCodeRelocSection();
void writeDataRelocSection();
void writeLinkingMetaDataSection(
uint32_t DataSize, ArrayRef<wasm::WasmSymbolInfo> SymbolInfos,
ArrayRef<wasm::WasmSymbolInfo> SymbolInfos,
ArrayRef<std::pair<uint16_t, uint32_t>> InitFuncs,
const std::map<StringRef, std::vector<WasmComdatEntry>> &Comdats);
@ -862,7 +862,7 @@ void WasmObjectWriter::writeDataRelocSection() {
}
void WasmObjectWriter::writeLinkingMetaDataSection(
uint32_t DataSize, ArrayRef<wasm::WasmSymbolInfo> SymbolInfos,
ArrayRef<wasm::WasmSymbolInfo> SymbolInfos,
ArrayRef<std::pair<uint16_t, uint32_t>> InitFuncs,
const std::map<StringRef, std::vector<WasmComdatEntry>> &Comdats) {
SectionBookkeeping Section;
@ -897,12 +897,6 @@ void WasmObjectWriter::writeLinkingMetaDataSection(
endSection(SubSection);
}
if (DataSize > 0) {
startSection(SubSection, wasm::WASM_DATA_SIZE);
encodeULEB128(DataSize, getStream());
endSection(SubSection);
}
if (DataSegments.size()) {
startSection(SubSection, wasm::WASM_SEGMENT_INFO);
encodeULEB128(DataSegments.size(), getStream());
@ -1316,7 +1310,7 @@ void WasmObjectWriter::writeObject(MCAssembler &Asm,
writeDataSection();
writeCodeRelocSection();
writeDataRelocSection();
writeLinkingMetaDataSection(DataSize, SymbolInfos, InitFuncs, Comdats);
writeLinkingMetaDataSection(SymbolInfos, InitFuncs, Comdats);
// TODO: Translate the .comment section to the output.
// TODO: Translate debug sections to the output.

5
lib/Object/WasmObjectFile.cpp
View File

@ -197,8 +197,6 @@ static Error readSection(WasmSection &Section, const uint8_t *&Ptr,
WasmObjectFile::WasmObjectFile(MemoryBufferRef Buffer, Error &Err)
: ObjectFile(Binary::ID_Wasm, Buffer) {
LinkingData.DataSize = 0;
ErrorAsOutParameter ErrAsOutParam(&Err);
Header.Magic = getData().substr(0, 4);
if (Header.Magic != StringRef("\0asm", 4)) {
@ -334,9 +332,6 @@ Error WasmObjectFile::parseLinkingSection(const uint8_t *Ptr,
if (Error Err = parseLinkingSectionSymtab(Ptr, SubSectionEnd))
return Err;
break;
case wasm::WASM_DATA_SIZE:
LinkingData.DataSize = readVaruint32(Ptr);
break;
case wasm::WASM_SEGMENT_INFO: {
uint32_t Count = readVaruint32(Ptr);
if (Count > DataSegments.size())

1
lib/ObjectYAML/WasmYAML.cpp
View File

@ -57,7 +57,6 @@ static void sectionMapping(IO &IO, WasmYAML::NameSection &Section) {
static void sectionMapping(IO &IO, WasmYAML::LinkingSection &Section) {
commonSectionMapping(IO, Section);
IO.mapRequired("Name", Section.Name);
IO.mapRequired("DataSize", Section.DataSize);
IO.mapOptional("SymbolTable", Section.SymbolTable);
IO.mapOptional("SegmentInfo", Section.SegmentInfos);
IO.mapOptional("InitFunctions", Section.InitFunctions);

1
test/MC/WebAssembly/array-fill.ll
View File

@ -14,7 +14,6 @@ target triple = "wasm32-unknown-unknown-wasm"
; CHECK: - Type: CUSTOM
; CHECK-NEXT: Name: linking
; CHECK-NEXT: DataSize: 2
; CHECK-NEXT: SymbolTable:
; CHECK-NEXT: - Index: 0
; CHECK-NEXT: Kind: DATA

1
test/MC/WebAssembly/bss.ll
View File

@ -37,7 +37,6 @@ target triple = "wasm32-unknown-unknown-wasm"
; CHECK-NEXT: Content: ''
; CHECK-NEXT: - Type: CUSTOM
; CHECK-NEXT: Name: linking
; CHECK-NEXT: DataSize: 8
; CHECK-NEXT: SymbolTable:
; CHECK-NEXT: - Index: 0
; CHECK-NEXT: Kind: DATA

1
test/MC/WebAssembly/comdat.ll
View File

@ -75,7 +75,6 @@ define linkonce_odr i32 @sharedFn() #1 comdat($sharedComdat) {
; CHECK-NEXT: Content: '616263'
; CHECK-NEXT: - Type: CUSTOM
; CHECK-NEXT: Name: linking
; CHECK-NEXT: DataSize: 3
; CHECK-NEXT: SymbolTable:
; CHECK-NEXT: - Index: 0
; CHECK-NEXT: Kind: FUNCTION

1
test/MC/WebAssembly/explicit-sections.ll
View File

@ -32,7 +32,6 @@ target triple = "wasm32-unknown-unknown-wasm"
; CHECK-NEXT: Content: '08000000'
; CHECK-NEXT: - Type: CUSTOM
; CHECK-NEXT: Name: linking
; CHECK-NEXT: DataSize: 28
; CHECK-NEXT: SymbolTable:
; CHECK-NEXT: - Index: 0
; CHECK-NEXT: Kind: DATA

1
test/MC/WebAssembly/global-ctor-dtor.ll
View File

@ -110,7 +110,6 @@ declare void @func3()
; CHECK-NEXT: Content: '01040000'
; CHECK-NEXT: - Type: CUSTOM
; CHECK-NEXT: Name: linking
; CHECK-NEXT: DataSize: 4
; CHECK-NEXT: SymbolTable:
; CHECK-NEXT: - Index: 0
; CHECK-NEXT: Kind: FUNCTION

1
test/MC/WebAssembly/unnamed-data.ll
View File

@ -44,7 +44,6 @@ target triple = "wasm32-unknown-unknown-wasm"
; CHECK-NEXT: Content: '06000000'
; CHECK-NEXT: - Type: CUSTOM
; CHECK-NEXT: Name: linking
; CHECK-NEXT: DataSize: 28
; CHECK-NEXT: SymbolTable:
; CHECK-NEXT: - Index: 0
; CHECK-NEXT: Kind: DATA

1
test/MC/WebAssembly/visibility.ll
View File

@ -16,7 +16,6 @@ entry:
; CHECK: - Type: CUSTOM
; CHECK-NEXT: Name: linking
; CHECK-NEXT: DataSize: 0
; CHECK-NEXT: SymbolTable:
; CHECK-NEXT: - Index: 0
; CHECK-NEXT: Kind: FUNCTION

1
test/MC/WebAssembly/weak-alias.ll
View File

@ -138,7 +138,6 @@ entry:
; CHECK-NEXT: Content: '01000000'
; CHECK-NEXT: - Type: CUSTOM
; CHECK-NEXT: Name: linking
; CHECK-NEXT: DataSize: 20
; CHECK-NEXT: SymbolTable:
; CHECK-NEXT: - Index: 0
; CHECK-NEXT: Kind: FUNCTION

1
test/MC/WebAssembly/weak.ll
View File

@ -22,7 +22,6 @@ entry:
; CHECK: - Type: CUSTOM
; CHECK-NEXT: Name: linking
; CHECK-NEXT: DataSize: 0
; CHECK-NEXT: SymbolTable:
; CHECK-NEXT: - Index: 0
; CHECK-NEXT: Kind: DATA

1
test/Object/obj2yaml.test
View File

@ -651,7 +651,6 @@ WASM-NEXT: FileHeader:
WASM-NEXT: Version: 0x00000001
WASM: - Type: CUSTOM
WASM-NEXT: Name: linking
WASM-NEXT: DataSize: 20
WASM-NEXT: SymbolTable:
WASM-NEXT: - Index: 0
WASM-NEXT: Kind: FUNCTION

2
test/ObjectYAML/wasm/linking_section.yaml
View File

@ -29,7 +29,6 @@ Sections:
Content: '11110000'
- Type: CUSTOM
Name: linking
DataSize: 999
SymbolTable:
- Index: 0
Kind: FUNCTION
@ -51,7 +50,6 @@ Sections:
...
# CHECK: - Type: CUSTOM
# CHECK-NEXT: Name: linking
# CHECK-NEXT: DataSize: 999
# CHECK-NEXT: SymbolTable:
# CHECK-NEXT: - Index: 0
# CHECK-NEXT: Kind: FUNCTION

2
test/ObjectYAML/wasm/weak_symbols.yaml
View File

@ -36,7 +36,6 @@ Sections:
Body: 00
- Type: CUSTOM
Name: linking
DataSize: 10
SymbolTable:
- Index: 0
Kind: FUNCTION
@ -63,7 +62,6 @@ Sections:
# CHECK: Index: 0
# CHECK: - Type: CUSTOM
# CHECK: Name: linking
# CHECK: DataSize: 10
# CHECK: SymbolTable:
# CHECK: - Index: 0
# CHECK: Kind: FUNCTION

1
test/tools/llvm-nm/wasm/exports.yaml
View File

@ -37,7 +37,6 @@ Sections:
Content: '616263'
- Type: CUSTOM
Name: linking
DataSize: 3
SymbolTable:
- Index: 0
Kind: FUNCTION

1
test/tools/llvm-nm/wasm/imports.yaml
View File

@ -25,7 +25,6 @@ Sections:
GlobalMutable: false
- Type: CUSTOM
Name: linking
DataSize: 3
SymbolTable:
- Index: 0
Kind: FUNCTION

1
test/tools/llvm-nm/wasm/weak-symbols.yaml
View File

@ -48,7 +48,6 @@ Sections:
Content: '616263'
- Type: CUSTOM
Name: linking
DataSize: 3
SymbolTable:
- Index: 0
Kind: DATA

1
test/tools/llvm-readobj/sections.test
View File

@ -537,6 +537,5 @@ WASM-NEXT: Type: CUSTOM (0x0)
WASM-NEXT: Size: 72
WASM-NEXT: Offset: 220
WASM-NEXT: Name: linking
WASM-NEXT: DataSize: 13
WASM-NEXT: }
WASM-NEXT: ]

1
tools/llvm-readobj/WasmDumper.cpp
View File

@ -153,7 +153,6 @@ void WasmDumper::printSections() {
W.printString("Name", WasmSec.Name);
if (WasmSec.Name == "linking") {
const wasm::WasmLinkingData &LinkingData = Obj->linkingData();
W.printNumber("DataSize", LinkingData.DataSize);
if (!LinkingData.InitFunctions.empty()) {
ListScope Group(W, "InitFunctions");
for (const wasm::WasmInitFunc &F: LinkingData.InitFunctions)

1
tools/obj2yaml/wasm2yaml.cpp
View File

@ -109,7 +109,6 @@ std::unique_ptr<WasmYAML::CustomSection> WasmDumper::dumpCustomSection(const Was
}
LinkingSec->SymbolTable.emplace_back(Info);
}
LinkingSec->DataSize = Obj.linkingData().DataSize;
for (const wasm::WasmInitFunc &Func : Obj.linkingData().InitFunctions) {
WasmYAML::InitFunction F{Func.Priority, Func.Symbol};
LinkingSec->InitFunctions.emplace_back(F);

5
tools/yaml2obj/yaml2wasm.cpp
View File

@ -136,11 +136,6 @@ int WasmWriter::writeSectionContent(raw_ostream &OS, WasmYAML::LinkingSection &S
SubSectionWriter SubSection(OS);
// DATA_SIZE subsection
encodeULEB128(wasm::WASM_DATA_SIZE, OS);
encodeULEB128(Section.DataSize, SubSection.GetStream());
SubSection.Done();
// SYMBOL_TABLE subsection
if (Section.SymbolTable.size()) {
encodeULEB128(wasm::WASM_SYMBOL_TABLE, OS);