d851fce4cb
Summary: This patch fixes a bug where initialization code for .bss segments was emitted in the memory initialization function even though the .bss segments were discounted in the datacount section and omitted in the data section. This was producing invalid binaries due to out-of-bounds segment indices on the memory.init and data.drop instructions that were trying to operate on the nonexistent .bss segments. Reviewers: sbc100 Subscribers: dschuff, jgravelle-google, aheejin, sunfish, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D80354
583 lines
18 KiB
C++
583 lines
18 KiB
C++
//===- SyntheticSections.cpp ----------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains linker-synthesized sections.
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//
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//===----------------------------------------------------------------------===//
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#include "SyntheticSections.h"
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#include "InputChunks.h"
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#include "InputEvent.h"
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#include "InputGlobal.h"
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#include "OutputSegment.h"
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#include "SymbolTable.h"
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#include "llvm/Support/Path.h"
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using namespace llvm;
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using namespace llvm::wasm;
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namespace lld {
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namespace wasm {
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OutStruct out;
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namespace {
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// Some synthetic sections (e.g. "name" and "linking") have subsections.
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// Just like the synthetic sections themselves these need to be created before
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// they can be written out (since they are preceded by their length). This
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// class is used to create subsections and then write them into the stream
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// of the parent section.
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class SubSection {
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public:
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explicit SubSection(uint32_t type) : type(type) {}
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void writeTo(raw_ostream &to) {
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os.flush();
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writeUleb128(to, type, "subsection type");
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writeUleb128(to, body.size(), "subsection size");
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to.write(body.data(), body.size());
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}
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private:
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uint32_t type;
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std::string body;
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public:
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raw_string_ostream os{body};
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};
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} // namespace
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void DylinkSection::writeBody() {
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raw_ostream &os = bodyOutputStream;
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writeUleb128(os, memSize, "MemSize");
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writeUleb128(os, memAlign, "MemAlign");
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writeUleb128(os, out.elemSec->numEntries(), "TableSize");
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writeUleb128(os, 0, "TableAlign");
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writeUleb128(os, symtab->sharedFiles.size(), "Needed");
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for (auto *so : symtab->sharedFiles)
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writeStr(os, llvm::sys::path::filename(so->getName()), "so name");
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}
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uint32_t TypeSection::registerType(const WasmSignature &sig) {
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auto pair = typeIndices.insert(std::make_pair(sig, types.size()));
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if (pair.second) {
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LLVM_DEBUG(llvm::dbgs() << "type " << toString(sig) << "\n");
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types.push_back(&sig);
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}
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return pair.first->second;
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}
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uint32_t TypeSection::lookupType(const WasmSignature &sig) {
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auto it = typeIndices.find(sig);
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if (it == typeIndices.end()) {
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error("type not found: " + toString(sig));
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return 0;
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}
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return it->second;
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}
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void TypeSection::writeBody() {
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writeUleb128(bodyOutputStream, types.size(), "type count");
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for (const WasmSignature *sig : types)
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writeSig(bodyOutputStream, *sig);
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}
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uint32_t ImportSection::getNumImports() const {
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assert(isSealed);
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uint32_t numImports = importedSymbols.size() + gotSymbols.size();
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if (config->importMemory)
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++numImports;
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if (config->importTable)
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++numImports;
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return numImports;
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}
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void ImportSection::addGOTEntry(Symbol *sym) {
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assert(!isSealed);
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if (sym->hasGOTIndex())
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return;
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LLVM_DEBUG(dbgs() << "addGOTEntry: " << toString(*sym) << "\n");
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sym->setGOTIndex(numImportedGlobals++);
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gotSymbols.push_back(sym);
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}
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void ImportSection::addImport(Symbol *sym) {
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assert(!isSealed);
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importedSymbols.emplace_back(sym);
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if (auto *f = dyn_cast<FunctionSymbol>(sym))
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f->setFunctionIndex(numImportedFunctions++);
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else if (auto *g = dyn_cast<GlobalSymbol>(sym))
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g->setGlobalIndex(numImportedGlobals++);
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else
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cast<EventSymbol>(sym)->setEventIndex(numImportedEvents++);
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}
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void ImportSection::writeBody() {
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raw_ostream &os = bodyOutputStream;
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writeUleb128(os, getNumImports(), "import count");
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if (config->importMemory) {
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WasmImport import;
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import.Module = defaultModule;
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import.Field = "memory";
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import.Kind = WASM_EXTERNAL_MEMORY;
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import.Memory.Flags = 0;
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import.Memory.Initial = out.memorySec->numMemoryPages;
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if (out.memorySec->maxMemoryPages != 0 || config->sharedMemory) {
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import.Memory.Flags |= WASM_LIMITS_FLAG_HAS_MAX;
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import.Memory.Maximum = out.memorySec->maxMemoryPages;
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}
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if (config->sharedMemory)
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import.Memory.Flags |= WASM_LIMITS_FLAG_IS_SHARED;
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writeImport(os, import);
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}
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if (config->importTable) {
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uint32_t tableSize = config->tableBase + out.elemSec->numEntries();
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WasmImport import;
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import.Module = defaultModule;
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import.Field = functionTableName;
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import.Kind = WASM_EXTERNAL_TABLE;
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import.Table.ElemType = WASM_TYPE_FUNCREF;
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import.Table.Limits = {0, tableSize, 0};
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writeImport(os, import);
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}
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for (const Symbol *sym : importedSymbols) {
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WasmImport import;
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if (auto *f = dyn_cast<UndefinedFunction>(sym)) {
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import.Field = f->importName ? *f->importName : sym->getName();
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import.Module = f->importModule ? *f->importModule : defaultModule;
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} else if (auto *g = dyn_cast<UndefinedGlobal>(sym)) {
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import.Field = g->importName ? *g->importName : sym->getName();
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import.Module = g->importModule ? *g->importModule : defaultModule;
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} else {
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import.Field = sym->getName();
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import.Module = defaultModule;
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}
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if (auto *functionSym = dyn_cast<FunctionSymbol>(sym)) {
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import.Kind = WASM_EXTERNAL_FUNCTION;
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import.SigIndex = out.typeSec->lookupType(*functionSym->signature);
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} else if (auto *globalSym = dyn_cast<GlobalSymbol>(sym)) {
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import.Kind = WASM_EXTERNAL_GLOBAL;
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import.Global = *globalSym->getGlobalType();
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} else {
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auto *eventSym = cast<EventSymbol>(sym);
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import.Kind = WASM_EXTERNAL_EVENT;
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import.Event.Attribute = eventSym->getEventType()->Attribute;
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import.Event.SigIndex = out.typeSec->lookupType(*eventSym->signature);
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}
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writeImport(os, import);
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}
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for (const Symbol *sym : gotSymbols) {
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WasmImport import;
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import.Kind = WASM_EXTERNAL_GLOBAL;
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import.Global = {WASM_TYPE_I32, true};
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if (isa<DataSymbol>(sym))
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import.Module = "GOT.mem";
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else
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import.Module = "GOT.func";
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import.Field = sym->getName();
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writeImport(os, import);
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}
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}
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void FunctionSection::writeBody() {
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raw_ostream &os = bodyOutputStream;
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writeUleb128(os, inputFunctions.size(), "function count");
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for (const InputFunction *func : inputFunctions)
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writeUleb128(os, out.typeSec->lookupType(func->signature), "sig index");
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}
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void FunctionSection::addFunction(InputFunction *func) {
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if (!func->live)
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return;
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uint32_t functionIndex =
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out.importSec->getNumImportedFunctions() + inputFunctions.size();
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inputFunctions.emplace_back(func);
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func->setFunctionIndex(functionIndex);
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}
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void TableSection::writeBody() {
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uint32_t tableSize = config->tableBase + out.elemSec->numEntries();
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raw_ostream &os = bodyOutputStream;
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writeUleb128(os, 1, "table count");
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WasmLimits limits;
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if (config->growableTable)
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limits = {0, tableSize, 0};
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else
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limits = {WASM_LIMITS_FLAG_HAS_MAX, tableSize, tableSize};
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writeTableType(os, WasmTable{WASM_TYPE_FUNCREF, limits});
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}
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void MemorySection::writeBody() {
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raw_ostream &os = bodyOutputStream;
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bool hasMax = maxMemoryPages != 0 || config->sharedMemory;
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writeUleb128(os, 1, "memory count");
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unsigned flags = 0;
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if (hasMax)
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flags |= WASM_LIMITS_FLAG_HAS_MAX;
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if (config->sharedMemory)
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flags |= WASM_LIMITS_FLAG_IS_SHARED;
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writeUleb128(os, flags, "memory limits flags");
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writeUleb128(os, numMemoryPages, "initial pages");
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if (hasMax)
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writeUleb128(os, maxMemoryPages, "max pages");
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}
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void EventSection::writeBody() {
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raw_ostream &os = bodyOutputStream;
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writeUleb128(os, inputEvents.size(), "event count");
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for (InputEvent *e : inputEvents) {
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e->event.Type.SigIndex = out.typeSec->lookupType(e->signature);
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writeEvent(os, e->event);
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}
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}
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void EventSection::addEvent(InputEvent *event) {
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if (!event->live)
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return;
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uint32_t eventIndex =
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out.importSec->getNumImportedEvents() + inputEvents.size();
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LLVM_DEBUG(dbgs() << "addEvent: " << eventIndex << "\n");
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event->setEventIndex(eventIndex);
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inputEvents.push_back(event);
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}
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void GlobalSection::assignIndexes() {
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uint32_t globalIndex = out.importSec->getNumImportedGlobals();
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for (InputGlobal *g : inputGlobals)
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g->setGlobalIndex(globalIndex++);
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for (Symbol *sym : staticGotSymbols)
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sym->setGOTIndex(globalIndex++);
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isSealed = true;
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}
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void GlobalSection::addStaticGOTEntry(Symbol *sym) {
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assert(!isSealed);
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if (sym->requiresGOT)
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return;
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LLVM_DEBUG(dbgs() << "addStaticGOTEntry: " << sym->getName() << " "
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<< toString(sym->kind()) << "\n");
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sym->requiresGOT = true;
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if (auto *F = dyn_cast<FunctionSymbol>(sym))
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out.elemSec->addEntry(F);
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staticGotSymbols.push_back(sym);
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}
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void GlobalSection::writeBody() {
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raw_ostream &os = bodyOutputStream;
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writeUleb128(os, numGlobals(), "global count");
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for (InputGlobal *g : inputGlobals)
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writeGlobal(os, g->global);
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for (const Symbol *sym : staticGotSymbols) {
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WasmGlobal global;
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global.Type = {WASM_TYPE_I32, false};
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global.InitExpr.Opcode = WASM_OPCODE_I32_CONST;
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if (auto *d = dyn_cast<DefinedData>(sym))
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global.InitExpr.Value.Int32 = d->getVirtualAddress();
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else if (auto *f = dyn_cast<FunctionSymbol>(sym))
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global.InitExpr.Value.Int32 = f->getTableIndex();
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else {
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assert(isa<UndefinedData>(sym));
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global.InitExpr.Value.Int32 = 0;
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}
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writeGlobal(os, global);
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}
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for (const DefinedData *sym : dataAddressGlobals) {
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WasmGlobal global;
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global.Type = {WASM_TYPE_I32, false};
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global.InitExpr.Opcode = WASM_OPCODE_I32_CONST;
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global.InitExpr.Value.Int32 = sym->getVirtualAddress();
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writeGlobal(os, global);
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}
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}
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void GlobalSection::addGlobal(InputGlobal *global) {
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assert(!isSealed);
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if (!global->live)
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return;
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inputGlobals.push_back(global);
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}
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void ExportSection::writeBody() {
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raw_ostream &os = bodyOutputStream;
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writeUleb128(os, exports.size(), "export count");
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for (const WasmExport &export_ : exports)
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writeExport(os, export_);
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}
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bool StartSection::isNeeded() const {
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return !config->relocatable && hasInitializedSegments && config->sharedMemory;
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}
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void StartSection::writeBody() {
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raw_ostream &os = bodyOutputStream;
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writeUleb128(os, WasmSym::initMemory->getFunctionIndex(), "function index");
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}
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void ElemSection::addEntry(FunctionSymbol *sym) {
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if (sym->hasTableIndex())
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return;
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sym->setTableIndex(config->tableBase + indirectFunctions.size());
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indirectFunctions.emplace_back(sym);
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}
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void ElemSection::writeBody() {
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raw_ostream &os = bodyOutputStream;
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writeUleb128(os, 1, "segment count");
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writeUleb128(os, 0, "table index");
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WasmInitExpr initExpr;
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if (config->isPic) {
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initExpr.Opcode = WASM_OPCODE_GLOBAL_GET;
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initExpr.Value.Global = WasmSym::tableBase->getGlobalIndex();
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} else {
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initExpr.Opcode = WASM_OPCODE_I32_CONST;
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initExpr.Value.Int32 = config->tableBase;
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}
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writeInitExpr(os, initExpr);
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writeUleb128(os, indirectFunctions.size(), "elem count");
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uint32_t tableIndex = config->tableBase;
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for (const FunctionSymbol *sym : indirectFunctions) {
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assert(sym->getTableIndex() == tableIndex);
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writeUleb128(os, sym->getFunctionIndex(), "function index");
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++tableIndex;
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}
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}
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DataCountSection::DataCountSection(ArrayRef<OutputSegment *> segments)
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: SyntheticSection(llvm::wasm::WASM_SEC_DATACOUNT),
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numSegments(std::count_if(
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segments.begin(), segments.end(),
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[](OutputSegment *const segment) { return !segment->isBss; })) {}
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void DataCountSection::writeBody() {
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writeUleb128(bodyOutputStream, numSegments, "data count");
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}
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bool DataCountSection::isNeeded() const {
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return numSegments && config->sharedMemory;
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}
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void LinkingSection::writeBody() {
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raw_ostream &os = bodyOutputStream;
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writeUleb128(os, WasmMetadataVersion, "Version");
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if (!symtabEntries.empty()) {
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SubSection sub(WASM_SYMBOL_TABLE);
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writeUleb128(sub.os, symtabEntries.size(), "num symbols");
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for (const Symbol *sym : symtabEntries) {
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assert(sym->isDefined() || sym->isUndefined());
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WasmSymbolType kind = sym->getWasmType();
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uint32_t flags = sym->flags;
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writeU8(sub.os, kind, "sym kind");
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writeUleb128(sub.os, flags, "sym flags");
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if (auto *f = dyn_cast<FunctionSymbol>(sym)) {
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writeUleb128(sub.os, f->getFunctionIndex(), "index");
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if (sym->isDefined() || (flags & WASM_SYMBOL_EXPLICIT_NAME) != 0)
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writeStr(sub.os, sym->getName(), "sym name");
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} else if (auto *g = dyn_cast<GlobalSymbol>(sym)) {
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writeUleb128(sub.os, g->getGlobalIndex(), "index");
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if (sym->isDefined() || (flags & WASM_SYMBOL_EXPLICIT_NAME) != 0)
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writeStr(sub.os, sym->getName(), "sym name");
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} else if (auto *e = dyn_cast<EventSymbol>(sym)) {
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writeUleb128(sub.os, e->getEventIndex(), "index");
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if (sym->isDefined() || (flags & WASM_SYMBOL_EXPLICIT_NAME) != 0)
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writeStr(sub.os, sym->getName(), "sym name");
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} else if (isa<DataSymbol>(sym)) {
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writeStr(sub.os, sym->getName(), "sym name");
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if (auto *dataSym = dyn_cast<DefinedData>(sym)) {
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writeUleb128(sub.os, dataSym->getOutputSegmentIndex(), "index");
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writeUleb128(sub.os, dataSym->getOutputSegmentOffset(),
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"data offset");
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writeUleb128(sub.os, dataSym->getSize(), "data size");
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}
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} else {
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auto *s = cast<OutputSectionSymbol>(sym);
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writeUleb128(sub.os, s->section->sectionIndex, "sym section index");
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}
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}
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sub.writeTo(os);
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}
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if (dataSegments.size()) {
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SubSection sub(WASM_SEGMENT_INFO);
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writeUleb128(sub.os, dataSegments.size(), "num data segments");
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for (const OutputSegment *s : dataSegments) {
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writeStr(sub.os, s->name, "segment name");
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writeUleb128(sub.os, s->alignment, "alignment");
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writeUleb128(sub.os, 0, "flags");
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}
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sub.writeTo(os);
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}
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if (!initFunctions.empty()) {
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SubSection sub(WASM_INIT_FUNCS);
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writeUleb128(sub.os, initFunctions.size(), "num init functions");
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for (const WasmInitEntry &f : initFunctions) {
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writeUleb128(sub.os, f.priority, "priority");
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writeUleb128(sub.os, f.sym->getOutputSymbolIndex(), "function index");
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}
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sub.writeTo(os);
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}
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struct ComdatEntry {
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unsigned kind;
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uint32_t index;
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};
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std::map<StringRef, std::vector<ComdatEntry>> comdats;
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for (const InputFunction *f : out.functionSec->inputFunctions) {
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StringRef comdat = f->getComdatName();
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if (!comdat.empty())
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comdats[comdat].emplace_back(
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ComdatEntry{WASM_COMDAT_FUNCTION, f->getFunctionIndex()});
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}
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for (uint32_t i = 0; i < dataSegments.size(); ++i) {
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const auto &inputSegments = dataSegments[i]->inputSegments;
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if (inputSegments.empty())
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continue;
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StringRef comdat = inputSegments[0]->getComdatName();
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#ifndef NDEBUG
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for (const InputSegment *isec : inputSegments)
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assert(isec->getComdatName() == comdat);
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#endif
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if (!comdat.empty())
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comdats[comdat].emplace_back(ComdatEntry{WASM_COMDAT_DATA, i});
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}
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if (!comdats.empty()) {
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SubSection sub(WASM_COMDAT_INFO);
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writeUleb128(sub.os, comdats.size(), "num comdats");
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for (const auto &c : comdats) {
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writeStr(sub.os, c.first, "comdat name");
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writeUleb128(sub.os, 0, "comdat flags"); // flags for future use
|
|
writeUleb128(sub.os, c.second.size(), "num entries");
|
|
for (const ComdatEntry &entry : c.second) {
|
|
writeU8(sub.os, entry.kind, "entry kind");
|
|
writeUleb128(sub.os, entry.index, "entry index");
|
|
}
|
|
}
|
|
sub.writeTo(os);
|
|
}
|
|
}
|
|
|
|
void LinkingSection::addToSymtab(Symbol *sym) {
|
|
sym->setOutputSymbolIndex(symtabEntries.size());
|
|
symtabEntries.emplace_back(sym);
|
|
}
|
|
|
|
unsigned NameSection::numNames() const {
|
|
unsigned numNames = out.importSec->getNumImportedFunctions();
|
|
for (const InputFunction *f : out.functionSec->inputFunctions)
|
|
if (!f->getName().empty() || !f->getDebugName().empty())
|
|
++numNames;
|
|
|
|
return numNames;
|
|
}
|
|
|
|
// Create the custom "name" section containing debug symbol names.
|
|
void NameSection::writeBody() {
|
|
SubSection sub(WASM_NAMES_FUNCTION);
|
|
writeUleb128(sub.os, numNames(), "name count");
|
|
|
|
// Names must appear in function index order. As it happens importedSymbols
|
|
// and inputFunctions are numbered in order with imported functions coming
|
|
// first.
|
|
for (const Symbol *s : out.importSec->importedSymbols) {
|
|
if (auto *f = dyn_cast<FunctionSymbol>(s)) {
|
|
writeUleb128(sub.os, f->getFunctionIndex(), "func index");
|
|
writeStr(sub.os, toString(*s), "symbol name");
|
|
}
|
|
}
|
|
for (const InputFunction *f : out.functionSec->inputFunctions) {
|
|
if (!f->getName().empty()) {
|
|
writeUleb128(sub.os, f->getFunctionIndex(), "func index");
|
|
if (!f->getDebugName().empty()) {
|
|
writeStr(sub.os, f->getDebugName(), "symbol name");
|
|
} else {
|
|
writeStr(sub.os, maybeDemangleSymbol(f->getName()), "symbol name");
|
|
}
|
|
}
|
|
}
|
|
|
|
sub.writeTo(bodyOutputStream);
|
|
}
|
|
|
|
void ProducersSection::addInfo(const WasmProducerInfo &info) {
|
|
for (auto &producers :
|
|
{std::make_pair(&info.Languages, &languages),
|
|
std::make_pair(&info.Tools, &tools), std::make_pair(&info.SDKs, &sDKs)})
|
|
for (auto &producer : *producers.first)
|
|
if (producers.second->end() ==
|
|
llvm::find_if(*producers.second,
|
|
[&](std::pair<std::string, std::string> seen) {
|
|
return seen.first == producer.first;
|
|
}))
|
|
producers.second->push_back(producer);
|
|
}
|
|
|
|
void ProducersSection::writeBody() {
|
|
auto &os = bodyOutputStream;
|
|
writeUleb128(os, fieldCount(), "field count");
|
|
for (auto &field :
|
|
{std::make_pair("language", languages),
|
|
std::make_pair("processed-by", tools), std::make_pair("sdk", sDKs)}) {
|
|
if (field.second.empty())
|
|
continue;
|
|
writeStr(os, field.first, "field name");
|
|
writeUleb128(os, field.second.size(), "number of entries");
|
|
for (auto &entry : field.second) {
|
|
writeStr(os, entry.first, "producer name");
|
|
writeStr(os, entry.second, "producer version");
|
|
}
|
|
}
|
|
}
|
|
|
|
void TargetFeaturesSection::writeBody() {
|
|
SmallVector<std::string, 8> emitted(features.begin(), features.end());
|
|
llvm::sort(emitted);
|
|
auto &os = bodyOutputStream;
|
|
writeUleb128(os, emitted.size(), "feature count");
|
|
for (auto &feature : emitted) {
|
|
writeU8(os, WASM_FEATURE_PREFIX_USED, "feature used prefix");
|
|
writeStr(os, feature, "feature name");
|
|
}
|
|
}
|
|
|
|
void RelocSection::writeBody() {
|
|
uint32_t count = sec->getNumRelocations();
|
|
assert(sec->sectionIndex != UINT32_MAX);
|
|
writeUleb128(bodyOutputStream, sec->sectionIndex, "reloc section");
|
|
writeUleb128(bodyOutputStream, count, "reloc count");
|
|
sec->writeRelocations(bodyOutputStream);
|
|
}
|
|
|
|
} // namespace wasm
|
|
} // namespace lld
|