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1eb79e732c
Previously we were relying on the dynamic loader to take care of this but it simple and correct for us to do it here instead. Now we initialize bss segments as part of `__wasm_init_memory` at the same time we initialize passive segments. In addition we extent the us of `__wasm_init_memory` outside of shared memory situations. Specifically it is now used to initialize bss segments when the memory is imported. Differential Revision: https://reviews.llvm.org/D112667
107 lines
3.0 KiB
C++
107 lines
3.0 KiB
C++
//===- Config.h -------------------------------------------------*- C++ -*-===//
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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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#ifndef LLD_WASM_CONFIG_H
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#define LLD_WASM_CONFIG_H
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/StringSet.h"
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#include "llvm/BinaryFormat/Wasm.h"
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#include "llvm/Support/CachePruning.h"
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namespace lld {
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namespace wasm {
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// For --unresolved-symbols.
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enum class UnresolvedPolicy { ReportError, Warn, Ignore };
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// This struct contains the global configuration for the linker.
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// Most fields are direct mapping from the command line options
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// and such fields have the same name as the corresponding options.
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// Most fields are initialized by the driver.
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struct Configuration {
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bool bsymbolic;
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bool checkFeatures;
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bool compressRelocations;
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bool demangle;
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bool disableVerify;
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bool experimentalPic;
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bool emitRelocs;
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bool exportAll;
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bool exportDynamic;
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bool exportTable;
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bool growableTable;
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bool gcSections;
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bool importMemory;
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bool sharedMemory;
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bool importTable;
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bool importUndefined;
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llvm::Optional<bool> is64;
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bool mergeDataSegments;
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bool pie;
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bool printGcSections;
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bool relocatable;
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bool saveTemps;
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bool shared;
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bool stripAll;
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bool stripDebug;
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bool stackFirst;
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bool trace;
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uint64_t globalBase;
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uint64_t initialMemory;
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uint64_t maxMemory;
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uint64_t zStackSize;
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unsigned ltoPartitions;
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unsigned ltoo;
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unsigned optimize;
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llvm::StringRef thinLTOJobs;
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bool ltoNewPassManager;
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bool ltoDebugPassManager;
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UnresolvedPolicy unresolvedSymbols;
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llvm::StringRef entry;
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llvm::StringRef mapFile;
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llvm::StringRef outputFile;
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llvm::StringRef thinLTOCacheDir;
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llvm::StringSet<> allowUndefinedSymbols;
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llvm::StringSet<> exportedSymbols;
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std::vector<llvm::StringRef> requiredExports;
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std::vector<llvm::StringRef> searchPaths;
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llvm::CachePruningPolicy thinLTOCachePolicy;
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llvm::Optional<std::vector<std::string>> features;
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// The following config options do not directly correspond to any
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// particular command line options.
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// True if we are creating position-independent code.
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bool isPic;
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// True if we have an MVP input that uses __indirect_function_table and which
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// requires it to be allocated to table number 0.
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bool legacyFunctionTable = false;
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// The table offset at which to place function addresses. We reserve zero
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// for the null function pointer. This gets set to 1 for executables and 0
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// for shared libraries (since they always added to a dynamic offset at
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// runtime).
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uint32_t tableBase = 0;
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// Will be set to true if bss data segments should be emitted. In most cases
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// this is not necessary.
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bool emitBssSegments = false;
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};
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// The only instance of Configuration struct.
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extern Configuration *config;
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} // namespace wasm
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} // namespace lld
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#endif
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