b2cdf3cc4c
It is beneficial to preallocate a certain number of pages in the linear memory (i. e. use the "minimum" field of WASM memories) so that fewer "memory.grow"s are needed at startup. So far, the way to do that has been to pass the "--initial-memory" option to the linker. It works, but has the very significant downside of requiring the user to know the size of static data beforehand, as it must not exceed the number of bytes passed-in as "--initial-memory". The new "--initial-heap" option avoids this downside by simply appending the specified number of pages to static data (and stack), regardless of how large they already are. Ref: https://github.com/emscripten-core/emscripten/issues/20888.
133 lines
3.9 KiB
C++
133 lines
3.9 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/SmallVector.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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#include <optional>
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namespace llvm {
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enum class CodeGenOptLevel;
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} // namespace llvm
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namespace lld::wasm {
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class InputFile;
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class Symbol;
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// For --unresolved-symbols.
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enum class UnresolvedPolicy { ReportError, Warn, Ignore, ImportDynamic };
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// For --build-id.
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enum class BuildIdKind { None, Fast, Sha1, Hexstring, Uuid };
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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 extendedConst;
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bool growableTable;
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bool gcSections;
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llvm::StringSet<> keepSections;
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std::optional<std::pair<llvm::StringRef, llvm::StringRef>> memoryImport;
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std::optional<llvm::StringRef> memoryExport;
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bool sharedMemory;
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bool importTable;
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bool importUndefined;
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std::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 isStatic = false;
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bool trace;
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uint64_t globalBase;
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uint64_t initialHeap;
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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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llvm::CodeGenOptLevel ltoCgo;
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unsigned optimize;
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llvm::StringRef thinLTOJobs;
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bool ltoDebugPassManager;
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UnresolvedPolicy unresolvedSymbols;
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BuildIdKind buildId = BuildIdKind::None;
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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 soName;
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llvm::StringRef thinLTOCacheDir;
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llvm::StringRef whyExtract;
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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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llvm::SmallVector<llvm::StringRef, 0> searchPaths;
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llvm::CachePruningPolicy thinLTOCachePolicy;
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std::optional<std::vector<std::string>> features;
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std::optional<std::vector<std::string>> extraFeatures;
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llvm::SmallVector<uint8_t, 0> buildIdVector;
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// The following config options do not directly correspond to any
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// particular command line options, and should probably be moved to separate
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// Ctx struct as in ELF/Config.h
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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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// A tuple of (reference, extractedFile, sym). Used by --why-extract=.
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llvm::SmallVector<std::tuple<std::string, const InputFile *, const Symbol &>,
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0>
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whyExtractRecords;
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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 lld::wasm
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#endif
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