1 //===- Config.h -------------------------------------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef LLD_WASM_CONFIG_H 10 #define LLD_WASM_CONFIG_H 11 12 #include "llvm/ADT/StringRef.h" 13 #include "llvm/ADT/StringSet.h" 14 #include "llvm/BinaryFormat/Wasm.h" 15 #include "llvm/Support/CachePruning.h" 16 17 namespace lld { 18 namespace wasm { 19 20 // For --unresolved-symbols. 21 enum class UnresolvedPolicy { ReportError, Warn, Ignore, ImportDynamic }; 22 23 // This struct contains the global configuration for the linker. 24 // Most fields are direct mapping from the command line options 25 // and such fields have the same name as the corresponding options. 26 // Most fields are initialized by the driver. 27 struct Configuration { 28 bool bsymbolic; 29 bool checkFeatures; 30 bool compressRelocations; 31 bool demangle; 32 bool disableVerify; 33 bool experimentalPic; 34 bool emitRelocs; 35 bool exportAll; 36 bool exportDynamic; 37 bool exportTable; 38 bool extendedConst; 39 bool growableTable; 40 bool gcSections; 41 bool importMemory; 42 bool sharedMemory; 43 bool importTable; 44 bool importUndefined; 45 llvm::Optional<bool> is64; 46 bool mergeDataSegments; 47 bool pie; 48 bool printGcSections; 49 bool relocatable; 50 bool saveTemps; 51 bool shared; 52 bool stripAll; 53 bool stripDebug; 54 bool stackFirst; 55 bool trace; 56 uint64_t globalBase; 57 uint64_t initialMemory; 58 uint64_t maxMemory; 59 uint64_t zStackSize; 60 unsigned ltoPartitions; 61 unsigned ltoo; 62 unsigned optimize; 63 llvm::StringRef thinLTOJobs; 64 bool ltoDebugPassManager; 65 UnresolvedPolicy unresolvedSymbols; 66 67 llvm::StringRef entry; 68 llvm::StringRef mapFile; 69 llvm::StringRef outputFile; 70 llvm::StringRef thinLTOCacheDir; 71 72 llvm::StringSet<> allowUndefinedSymbols; 73 llvm::StringSet<> exportedSymbols; 74 std::vector<llvm::StringRef> requiredExports; 75 std::vector<llvm::StringRef> searchPaths; 76 llvm::CachePruningPolicy thinLTOCachePolicy; 77 llvm::Optional<std::vector<std::string>> features; 78 79 // The following config options do not directly correspond to any 80 // particular command line options. 81 82 // True if we are creating position-independent code. 83 bool isPic; 84 85 // True if we have an MVP input that uses __indirect_function_table and which 86 // requires it to be allocated to table number 0. 87 bool legacyFunctionTable = false; 88 89 // The table offset at which to place function addresses. We reserve zero 90 // for the null function pointer. This gets set to 1 for executables and 0 91 // for shared libraries (since they always added to a dynamic offset at 92 // runtime). 93 uint32_t tableBase = 0; 94 95 // Will be set to true if bss data segments should be emitted. In most cases 96 // this is not necessary. 97 bool emitBssSegments = false; 98 }; 99 100 // The only instance of Configuration struct. 101 extern Configuration *config; 102 103 } // namespace wasm 104 } // namespace lld 105 106 #endif 107