128 lines
4.6 KiB
C++
128 lines
4.6 KiB
C++
//===- Utils.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 LLVM_DWARFLINKER_UTILS_H
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#define LLVM_DWARFLINKER_UTILS_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/DebugInfo/DWARF/DWARFDebugLine.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Path.h"
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namespace llvm {
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namespace dwarf_linker {
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/// Build a map from an input DW_AT_LLVM_stmt_sequence byte offset to
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/// the first-row index (in \p LT.Rows) of the corresponding line-table
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/// sequence. Seeds the map from \p LT.Sequences (the DWARF parser's
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/// discovered sequences), then augments it by walking row boundaries
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/// (DW_LNE_end_sequence markers) and matching them against the sorted
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/// input offsets in \p SortedStmtSeqOffsets, using the parser's results
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/// as ground-truth anchors. This recovers sequences the parser may not
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/// have registered and keeps the classic and parallel DWARFLinkers in
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/// lockstep. Caller passes \p SortedStmtSeqOffsets sorted ascending
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/// and deduplicated.
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LLVM_ABI void buildStmtSeqOffsetToFirstRowIndex(
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const DWARFDebugLine::LineTable <,
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ArrayRef<uint64_t> SortedStmtSeqOffsets,
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DenseMap<uint64_t, uint64_t> &SeqOffToFirstRow);
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/// This function calls \p Iteration() until it returns false.
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/// If number of iterations exceeds \p MaxCounter then an Error is returned.
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/// This function should be used for loops which assumed to have number of
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/// iterations significantly smaller than \p MaxCounter to avoid infinite
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/// looping in error cases.
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inline Error finiteLoop(function_ref<Expected<bool>()> Iteration,
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size_t MaxCounter = 100000) {
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size_t iterationsCounter = 0;
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while (iterationsCounter++ < MaxCounter) {
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Expected<bool> IterationResultOrError = Iteration();
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if (!IterationResultOrError)
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return IterationResultOrError.takeError();
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if (!IterationResultOrError.get())
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return Error::success();
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}
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return createStringError(std::errc::invalid_argument, "Infinite recursion");
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}
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/// Make a best effort to guess the
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/// Xcode.app/Contents/Developer path from an SDK path.
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inline StringRef guessDeveloperDir(StringRef SysRoot) {
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// Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk
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auto it = sys::path::rbegin(SysRoot);
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auto end = sys::path::rend(SysRoot);
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if (it == end || !it->ends_with(".sdk"))
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return {};
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++it;
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// Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs
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if (it == end || *it != "SDKs")
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return {};
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auto developerEnd = it;
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++it;
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while (it != end) {
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// Contents/Developer/Platforms/MacOSX.platform/Developer
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if (*it != "Developer")
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return {};
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++it;
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if (it == end)
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return {};
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if (*it == "Contents")
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return StringRef(SysRoot.data(),
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developerEnd - sys::path::rend(SysRoot) - 1);
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// Contents/Developer/Platforms/MacOSX.platform
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if (!it->ends_with(".platform"))
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return {};
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++it;
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// Contents/Developer/Platforms
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if (it == end || *it != "Platforms")
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return {};
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developerEnd = it;
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++it;
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}
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return {};
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}
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/// Make a best effort to determine whether Path is inside a toolchain.
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inline bool isInToolchainDir(StringRef Path) {
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// Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-05-15-a.xctoolchain/usr/lib/swift/macosx/_StringProcessing.swiftmodule/arm64-apple-macos.private.swiftinterface
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for (auto it = sys::path::rbegin(Path), end = sys::path::rend(Path);
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it != end; ++it) {
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if (it->ends_with(".xctoolchain")) {
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++it;
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if (it == end)
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return false;
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if (*it != "Toolchains")
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return false;
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++it;
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if (it == end)
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return false;
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if (*it != "Developer")
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return false;
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return true;
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}
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}
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return false;
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}
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inline bool isPathAbsoluteOnWindowsOrPosix(const Twine &Path) {
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// Debug info can contain paths from any OS, not necessarily
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// an OS we're currently running on. Moreover different compilation units can
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// be compiled on different operating systems and linked together later.
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return sys::path::is_absolute(Path, sys::path::Style::posix) ||
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sys::path::is_absolute(Path, sys::path::Style::windows);
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}
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} // end of namespace dwarf_linker
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} // end of namespace llvm
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#endif // LLVM_DWARFLINKER_UTILS_H
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