206884bf90
This is a more full featured version of ``--allow-undefined``. The semantics of the different methods are as follows: report-all: Report all unresolved symbols. This is the default. Normally the linker will generate an error message for each reported unresolved symbol but the option ``--warn-unresolved-symbols`` can change this to a warning. ignore-all: Resolve all undefined symbols to zero. For data and function addresses this is trivial. For direct function calls, the linker will generate a trapping stub function in place of the undefined function. import-functions: Generate WebAssembly imports for any undefined functions. Undefined data symbols are resolved to zero as in `ignore-all`. This corresponds to the legacy ``--allow-undefined`` flag. The plan is to followup with a new mode called `import-dynamic` which allows for statically linked binaries to refer to both data and functions symbols from the embedder. Differential Revision: https://reviews.llvm.org/D79248
98 lines
2.8 KiB
C++
98 lines
2.8 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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// The `ImportFuncs` mode is an additional mode that corresponds to the
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// --allow-undefined flag which turns undefined functions in imports
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// as opposed ed to Ignore or Warn which turn them into unreachables.
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enum class UnresolvedPolicy { ReportError, Warn, Ignore, ImportFuncs };
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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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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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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> 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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// particualr 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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// 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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};
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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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