[lld][WebAssembly] Move input vectors from symtab to ctx. NFC #78640
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@llvm/pr-subscribers-lld @llvm/pr-subscribers-lld-wasm Author: Sam Clegg (sbc100) ChangesAlso convert from std::vector to SmallVector. This matches the ELF linker where these were moved into the ctx object in 9a57216 and converted to SmallVector in ba948c5. Full diff: https://github.com/llvm/llvm-project/pull/78640.diff 8 Files Affected:
diff --git a/lld/wasm/Config.h b/lld/wasm/Config.h
index cc8a1dcb69afe06..dc7ca265e9a2cb1 100644
--- a/lld/wasm/Config.h
+++ b/lld/wasm/Config.h
@@ -23,6 +23,13 @@ enum class CodeGenOptLevel;
namespace lld::wasm {
class InputFile;
+class StubFile;
+class ObjFile;
+class SharedFile;
+class BitcodeFile;
+class InputTable;
+class InputGlobal;
+class InputFunction;
class Symbol;
// For --unresolved-symbols.
@@ -108,6 +115,14 @@ extern Configuration *config;
// The Ctx object hold all other (non-configuration) global state.
struct Ctx {
+ llvm::SmallVector<ObjFile *, 0> objectFiles;
+ llvm::SmallVector<StubFile *, 0> stubFiles;
+ llvm::SmallVector<SharedFile *, 0> sharedFiles;
+ llvm::SmallVector<BitcodeFile *, 0> bitcodeFiles;
+ llvm::SmallVector<InputFunction *, 0> syntheticFunctions;
+ llvm::SmallVector<InputGlobal *, 0> syntheticGlobals;
+ llvm::SmallVector<InputTable *, 0> syntheticTables;
+
// True if we are creating position-independent code.
bool isPic;
diff --git a/lld/wasm/Driver.cpp b/lld/wasm/Driver.cpp
index 05a96860966ea3d..4a4f9a96227946d 100644
--- a/lld/wasm/Driver.cpp
+++ b/lld/wasm/Driver.cpp
@@ -899,7 +899,7 @@ static void createOptionalSymbols() {
static void processStubLibrariesPreLTO() {
log("-- processStubLibrariesPreLTO");
- for (auto &stub_file : symtab->stubFiles) {
+ for (auto &stub_file : ctx.stubFiles) {
LLVM_DEBUG(llvm::dbgs()
<< "processing stub file: " << stub_file->getName() << "\n");
for (auto [name, deps]: stub_file->symbolDependencies) {
@@ -924,7 +924,7 @@ static void processStubLibraries() {
bool depsAdded = false;
do {
depsAdded = false;
- for (auto &stub_file : symtab->stubFiles) {
+ for (auto &stub_file : ctx.stubFiles) {
LLVM_DEBUG(llvm::dbgs()
<< "processing stub file: " << stub_file->getName() << "\n");
for (auto [name, deps]: stub_file->symbolDependencies) {
@@ -1075,7 +1075,7 @@ static void wrapSymbols(ArrayRef<WrappedSymbol> wrapped) {
}
// Update pointers in input files.
- parallelForEach(symtab->objectFiles, [&](InputFile *file) {
+ parallelForEach(ctx.objectFiles, [&](InputFile *file) {
MutableArrayRef<Symbol *> syms = file->getMutableSymbols();
for (size_t i = 0, e = syms.size(); i != e; ++i)
if (Symbol *s = map.lookup(syms[i]))
@@ -1091,7 +1091,7 @@ static void splitSections() {
// splitIntoPieces needs to be called on each MergeInputChunk
// before calling finalizeContents().
LLVM_DEBUG(llvm::dbgs() << "splitSections\n");
- parallelForEach(symtab->objectFiles, [](ObjFile *file) {
+ parallelForEach(ctx.objectFiles, [](ObjFile *file) {
for (InputChunk *seg : file->segments) {
if (auto *s = dyn_cast<MergeInputChunk>(seg))
s->splitIntoPieces();
@@ -1263,7 +1263,7 @@ void LinkerDriver::linkerMain(ArrayRef<const char *> argsArr) {
// We only need to add libcall symbols to the link before LTO if the symbol's
// definition is in bitcode. Any other required libcall symbols will be added
// to the link after LTO when we add the LTO object file to the link.
- if (!symtab->bitcodeFiles.empty())
+ if (!ctx.bitcodeFiles.empty())
for (auto *s : lto::LTO::getRuntimeLibcallSymbols())
handleLibcall(s);
if (errorCount())
diff --git a/lld/wasm/MapFile.cpp b/lld/wasm/MapFile.cpp
index 288c189854dbd12..c96b64cb648381c 100644
--- a/lld/wasm/MapFile.cpp
+++ b/lld/wasm/MapFile.cpp
@@ -51,7 +51,7 @@ static void writeHeader(raw_ostream &os, int64_t vma, uint64_t lma,
// Returns a list of all symbols that we want to print out.
static std::vector<Symbol *> getSymbols() {
std::vector<Symbol *> v;
- for (InputFile *file : symtab->objectFiles)
+ for (InputFile *file : ctx.objectFiles)
for (Symbol *b : file->getSymbols())
if (auto *dr = dyn_cast<Symbol>(b))
if ((!isa<SectionSymbol>(dr)) && dr->isLive() &&
diff --git a/lld/wasm/MarkLive.cpp b/lld/wasm/MarkLive.cpp
index 773af2f7e2360ec..b8ab7741ff1cb31 100644
--- a/lld/wasm/MarkLive.cpp
+++ b/lld/wasm/MarkLive.cpp
@@ -97,7 +97,7 @@ void MarkLive::run() {
enqueue(WasmSym::callDtors);
// Enqueue constructors in objects explicitly live from the command-line.
- for (const ObjFile *obj : symtab->objectFiles)
+ for (const ObjFile *obj : ctx.objectFiles)
if (obj->isLive())
enqueueInitFunctions(obj);
@@ -151,7 +151,7 @@ void markLive() {
// Report garbage-collected sections.
if (config->printGcSections) {
- for (const ObjFile *obj : symtab->objectFiles) {
+ for (const ObjFile *obj : ctx.objectFiles) {
for (InputChunk *c : obj->functions)
if (!c->live)
message("removing unused section " + toString(c));
@@ -168,13 +168,13 @@ void markLive() {
if (!t->live)
message("removing unused section " + toString(t));
}
- for (InputChunk *c : symtab->syntheticFunctions)
+ for (InputChunk *c : ctx.syntheticFunctions)
if (!c->live)
message("removing unused section " + toString(c));
- for (InputGlobal *g : symtab->syntheticGlobals)
+ for (InputGlobal *g : ctx.syntheticGlobals)
if (!g->live)
message("removing unused section " + toString(g));
- for (InputTable *t : symtab->syntheticTables)
+ for (InputTable *t : ctx.syntheticTables)
if (!t->live)
message("removing unused section " + toString(t));
}
@@ -192,7 +192,7 @@ bool MarkLive::isCallCtorsLive() {
// If there are any init functions, mark `__wasm_call_ctors` live so that
// it can call them.
- for (const ObjFile *file : symtab->objectFiles) {
+ for (const ObjFile *file : ctx.objectFiles) {
const WasmLinkingData &l = file->getWasmObj()->linkingData();
for (const WasmInitFunc &f : l.InitFunctions) {
auto *sym = file->getFunctionSymbol(f.Symbol);
diff --git a/lld/wasm/SymbolTable.cpp b/lld/wasm/SymbolTable.cpp
index 9dd599e18975e31..9988490e14b0bc1 100644
--- a/lld/wasm/SymbolTable.cpp
+++ b/lld/wasm/SymbolTable.cpp
@@ -34,14 +34,14 @@ void SymbolTable::addFile(InputFile *file, StringRef symName) {
// .so file
if (auto *f = dyn_cast<SharedFile>(file)) {
- sharedFiles.push_back(f);
+ ctx.sharedFiles.push_back(f);
return;
}
// stub file
if (auto *f = dyn_cast<StubFile>(file)) {
f->parse();
- stubFiles.push_back(f);
+ ctx.stubFiles.push_back(f);
return;
}
@@ -52,7 +52,7 @@ void SymbolTable::addFile(InputFile *file, StringRef symName) {
if (auto *f = dyn_cast<BitcodeFile>(file)) {
// This order, first adding to `bitcodeFiles` and then parsing is necessary.
// See https://github.com/llvm/llvm-project/pull/73095
- bitcodeFiles.push_back(f);
+ ctx.bitcodeFiles.push_back(f);
f->parse(symName);
return;
}
@@ -60,7 +60,7 @@ void SymbolTable::addFile(InputFile *file, StringRef symName) {
// Regular object file
auto *f = cast<ObjFile>(file);
f->parse(false);
- objectFiles.push_back(f);
+ ctx.objectFiles.push_back(f);
}
// This function is where all the optimizations of link-time
@@ -74,18 +74,18 @@ void SymbolTable::compileBitcodeFiles() {
// Prevent further LTO objects being included
BitcodeFile::doneLTO = true;
- if (bitcodeFiles.empty())
+ if (ctx.bitcodeFiles.empty())
return;
// Compile bitcode files and replace bitcode symbols.
lto.reset(new BitcodeCompiler);
- for (BitcodeFile *f : bitcodeFiles)
+ for (BitcodeFile *f : ctx.bitcodeFiles)
lto->add(*f);
for (StringRef filename : lto->compile()) {
auto *obj = make<ObjFile>(MemoryBufferRef(filename, "lto.tmp"), "");
obj->parse(true);
- objectFiles.push_back(obj);
+ ctx.objectFiles.push_back(obj);
}
}
@@ -218,7 +218,7 @@ DefinedFunction *SymbolTable::addSyntheticFunction(StringRef name,
InputFunction *function) {
LLVM_DEBUG(dbgs() << "addSyntheticFunction: " << name << "\n");
assert(!find(name));
- syntheticFunctions.emplace_back(function);
+ ctx.syntheticFunctions.emplace_back(function);
return replaceSymbol<DefinedFunction>(insertName(name).first, name,
flags, nullptr, function);
}
@@ -255,7 +255,7 @@ DefinedGlobal *SymbolTable::addSyntheticGlobal(StringRef name, uint32_t flags,
LLVM_DEBUG(dbgs() << "addSyntheticGlobal: " << name << " -> " << global
<< "\n");
assert(!find(name));
- syntheticGlobals.emplace_back(global);
+ ctx.syntheticGlobals.emplace_back(global);
return replaceSymbol<DefinedGlobal>(insertName(name).first, name, flags,
nullptr, global);
}
@@ -267,7 +267,7 @@ DefinedGlobal *SymbolTable::addOptionalGlobalSymbol(StringRef name,
return nullptr;
LLVM_DEBUG(dbgs() << "addOptionalGlobalSymbol: " << name << " -> " << global
<< "\n");
- syntheticGlobals.emplace_back(global);
+ ctx.syntheticGlobals.emplace_back(global);
return replaceSymbol<DefinedGlobal>(s, name, WASM_SYMBOL_VISIBILITY_HIDDEN,
nullptr, global);
}
@@ -280,7 +280,7 @@ DefinedTable *SymbolTable::addSyntheticTable(StringRef name, uint32_t flags,
assert(!s || s->isUndefined());
if (!s)
s = insertName(name).first;
- syntheticTables.emplace_back(table);
+ ctx.syntheticTables.emplace_back(table);
return replaceSymbol<DefinedTable>(s, name, flags, nullptr, table);
}
@@ -855,7 +855,7 @@ InputFunction *SymbolTable::replaceWithUnreachable(Symbol *sym,
StringRef debugName) {
auto *func = make<SyntheticFunction>(sig, sym->getName(), debugName);
func->setBody(unreachableFn);
- syntheticFunctions.emplace_back(func);
+ ctx.syntheticFunctions.emplace_back(func);
// Mark new symbols as local. For relocatable output we don't want them
// to be exported outside the object file.
replaceSymbol<DefinedFunction>(sym, debugName, WASM_SYMBOL_BINDING_LOCAL,
diff --git a/lld/wasm/SymbolTable.h b/lld/wasm/SymbolTable.h
index 59eda1c0b6740c2..c5518ee23da26da 100644
--- a/lld/wasm/SymbolTable.h
+++ b/lld/wasm/SymbolTable.h
@@ -101,14 +101,6 @@ class SymbolTable {
void handleWeakUndefines();
DefinedFunction *createUndefinedStub(const WasmSignature &sig);
- std::vector<ObjFile *> objectFiles;
- std::vector<StubFile *> stubFiles;
- std::vector<SharedFile *> sharedFiles;
- std::vector<BitcodeFile *> bitcodeFiles;
- std::vector<InputFunction *> syntheticFunctions;
- std::vector<InputGlobal *> syntheticGlobals;
- std::vector<InputTable *> syntheticTables;
-
private:
std::pair<Symbol *, bool> insert(StringRef name, const InputFile *file);
std::pair<Symbol *, bool> insertName(StringRef name);
diff --git a/lld/wasm/SyntheticSections.cpp b/lld/wasm/SyntheticSections.cpp
index f95174fe6f2695c..72e255951608e1b 100644
--- a/lld/wasm/SyntheticSections.cpp
+++ b/lld/wasm/SyntheticSections.cpp
@@ -57,7 +57,7 @@ class SubSection {
bool DylinkSection::isNeeded() const {
return ctx.isPic ||
config->unresolvedSymbols == UnresolvedPolicy::ImportDynamic ||
- !symtab->sharedFiles.empty();
+ !ctx.sharedFiles.empty();
}
void DylinkSection::writeBody() {
@@ -72,10 +72,10 @@ void DylinkSection::writeBody() {
sub.writeTo(os);
}
- if (symtab->sharedFiles.size()) {
+ if (ctx.sharedFiles.size()) {
SubSection sub(WASM_DYLINK_NEEDED);
- writeUleb128(sub.os, symtab->sharedFiles.size(), "Needed");
- for (auto *so : symtab->sharedFiles)
+ writeUleb128(sub.os, ctx.sharedFiles.size(), "Needed");
+ for (auto *so : ctx.sharedFiles)
writeStr(sub.os, llvm::sys::path::filename(so->getName()), "so name");
sub.writeTo(os);
}
diff --git a/lld/wasm/Writer.cpp b/lld/wasm/Writer.cpp
index 7c19a1baf4c0451..d1a06c9ac9c2aee 100644
--- a/lld/wasm/Writer.cpp
+++ b/lld/wasm/Writer.cpp
@@ -133,7 +133,7 @@ class Writer {
void Writer::calculateCustomSections() {
log("calculateCustomSections");
bool stripDebug = config->stripDebug || config->stripAll;
- for (ObjFile *file : symtab->objectFiles) {
+ for (ObjFile *file : ctx.objectFiles) {
for (InputChunk *section : file->customSections) {
// Exclude COMDAT sections that are not selected for inclusion
if (section->discarded)
@@ -207,7 +207,7 @@ void Writer::createRelocSections() {
}
void Writer::populateProducers() {
- for (ObjFile *file : symtab->objectFiles) {
+ for (ObjFile *file : ctx.objectFiles) {
const WasmProducerInfo &info = file->getWasmObj()->getProducerInfo();
out.producersSec->addInfo(info);
}
@@ -591,7 +591,7 @@ void Writer::populateTargetFeatures() {
}
// Find the sets of used, required, and disallowed features
- for (ObjFile *file : symtab->objectFiles) {
+ for (ObjFile *file : ctx.objectFiles) {
StringRef fileName(file->getName());
for (auto &feature : file->getWasmObj()->getTargetFeatures()) {
switch (feature.Prefix) {
@@ -654,7 +654,7 @@ void Writer::populateTargetFeatures() {
}
// Validate the required and disallowed constraints for each file
- for (ObjFile *file : symtab->objectFiles) {
+ for (ObjFile *file : ctx.objectFiles) {
StringRef fileName(file->getName());
SmallSet<std::string, 8> objectFeatures;
for (const auto &feature : file->getWasmObj()->getTargetFeatures()) {
@@ -832,7 +832,7 @@ void Writer::populateSymtab() {
if (sym->isUsedInRegularObj && sym->isLive())
out.linkingSec->addToSymtab(sym);
- for (ObjFile *file : symtab->objectFiles) {
+ for (ObjFile *file : ctx.objectFiles) {
LLVM_DEBUG(dbgs() << "Local symtab entries: " << file->getName() << "\n");
for (Symbol *sym : file->getSymbols())
if (sym->isLocal() && !isa<SectionSymbol>(sym) && sym->isLive())
@@ -848,7 +848,7 @@ void Writer::calculateTypes() {
// 4. The signatures of all imported tags
// 5. The signatures of all defined tags
- for (ObjFile *file : symtab->objectFiles) {
+ for (ObjFile *file : ctx.objectFiles) {
ArrayRef<WasmSignature> types = file->getWasmObj()->types();
for (uint32_t i = 0; i < types.size(); i++)
if (file->typeIsUsed[i])
@@ -939,7 +939,7 @@ static void finalizeIndirectFunctionTable() {
}
static void scanRelocations() {
- for (ObjFile *file : symtab->objectFiles) {
+ for (ObjFile *file : ctx.objectFiles) {
LLVM_DEBUG(dbgs() << "scanRelocations: " << file->getName() << "\n");
for (InputChunk *chunk : file->functions)
scanRelocations(chunk);
@@ -955,37 +955,37 @@ void Writer::assignIndexes() {
// global are effected by the number of imports.
out.importSec->seal();
- for (InputFunction *func : symtab->syntheticFunctions)
+ for (InputFunction *func : ctx.syntheticFunctions)
out.functionSec->addFunction(func);
- for (ObjFile *file : symtab->objectFiles) {
+ for (ObjFile *file : ctx.objectFiles) {
LLVM_DEBUG(dbgs() << "Functions: " << file->getName() << "\n");
for (InputFunction *func : file->functions)
out.functionSec->addFunction(func);
}
- for (InputGlobal *global : symtab->syntheticGlobals)
+ for (InputGlobal *global : ctx.syntheticGlobals)
out.globalSec->addGlobal(global);
- for (ObjFile *file : symtab->objectFiles) {
+ for (ObjFile *file : ctx.objectFiles) {
LLVM_DEBUG(dbgs() << "Globals: " << file->getName() << "\n");
for (InputGlobal *global : file->globals)
out.globalSec->addGlobal(global);
}
- for (ObjFile *file : symtab->objectFiles) {
+ for (ObjFile *file : ctx.objectFiles) {
LLVM_DEBUG(dbgs() << "Tags: " << file->getName() << "\n");
for (InputTag *tag : file->tags)
out.tagSec->addTag(tag);
}
- for (ObjFile *file : symtab->objectFiles) {
+ for (ObjFile *file : ctx.objectFiles) {
LLVM_DEBUG(dbgs() << "Tables: " << file->getName() << "\n");
for (InputTable *table : file->tables)
out.tableSec->addTable(table);
}
- for (InputTable *table : symtab->syntheticTables)
+ for (InputTable *table : ctx.syntheticTables)
out.tableSec->addTable(table);
out.globalSec->assignIndexes();
@@ -1022,7 +1022,7 @@ OutputSegment *Writer::createOutputSegment(StringRef name) {
}
void Writer::createOutputSegments() {
- for (ObjFile *file : symtab->objectFiles) {
+ for (ObjFile *file : ctx.objectFiles) {
for (InputChunk *segment : file->segments) {
if (!segment->live)
continue;
@@ -1639,7 +1639,7 @@ void Writer::calculateInitFunctions() {
if (!config->relocatable && !WasmSym::callCtors->isLive())
return;
- for (ObjFile *file : symtab->objectFiles) {
+ for (ObjFile *file : ctx.objectFiles) {
const WasmLinkingData &l = file->getWasmObj()->linkingData();
for (const WasmInitFunc &f : l.InitFunctions) {
FunctionSymbol *sym = file->getFunctionSymbol(f.Symbol);
|
MaskRay
approved these changes
Jan 18, 2024
|
This change has apparently injected crashes in Halide when we use LLD in library form for WebAssembly... SISGSEV in calls to MarkLive::enqueueInitFunctions: |
|
...hmm, do we ever clear those newly added vectors in |
|
Yep, that's it, if I clear those reset the Ctx to initial state at the top of each call to link() it heals it. I'll prep a PR if no one is already doing so. |
|
(The ELF linker might need a similar fix?) |
|
The ELF linker already handles clearing all the stuff. I think the fix is straight forward, but writing tests is the tricky part.. I'll see how this is tested in ELF and try to replicate. |
|
Ah, OK: I'll skip the PR if you are already on it. |
|
(But may I suggest that a quick fix-or-rollback would be appropriate if adding tests will take a while, because in this state, using wasm-lld as a library is extremely broken.) |
sbc100
added a commit
to sbc100/llvm-project
that referenced
this pull request
Jan 19, 2024
This mirrors who the ELF linker works. I wasn't able to find anywhere where this is currently tested. Followup to llvm#78640, which triggered a regression.
sbc100
added a commit
that referenced
this pull request
Jan 19, 2024
This mirrors how the ELF linker works. I wasn't able to find anywhere where this is currently tested. Followup to #78640, which triggered a regression.
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Also convert from std::vector to SmallVector.
This matches the ELF linker where these were moved into the ctx object in 9a57216 and converted to SmallVector in ba948c5.