07bb29d8ff
This avoid rediscovering this table when reading each options, providing a sensible 2% speedup when processing and empty file, and a measurable speedup on typical workloads, see: This is optional, the legacy, on-the-fly, approach can still be used through the GenericOptTable class, while the new one is used through PrecomputedOptTable. https://llvm-compile-time-tracker.com/compare.php?from=4da6cb3202817ee2897d6b690e4af950459caea4&to=19a492b704e8f5c1dea120b9c0d3859bd78796be&stat=instructions:u Differential Revision: https://reviews.llvm.org/D140800
89 lines
3.5 KiB
C++
89 lines
3.5 KiB
C++
//===-- COFFDirectiveParser.cpp - JITLink coff directive parser --*- 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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//
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// MSVC COFF directive parser
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//
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//===----------------------------------------------------------------------===//
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#include "COFFDirectiveParser.h"
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#include <array>
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using namespace llvm;
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using namespace jitlink;
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#define DEBUG_TYPE "jitlink"
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// Create prefix string literals used in Options.td
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#define PREFIX(NAME, VALUE) \
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static constexpr StringLiteral NAME##_init[] = VALUE; \
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static constexpr ArrayRef<StringLiteral> NAME(NAME##_init, \
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std::size(NAME##_init) - 1);
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#include "COFFOptions.inc"
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#undef PREFIX
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static constexpr const StringLiteral PrefixTable_init[] =
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#define PREFIX_UNION(VALUES) VALUES
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#include "COFFOptions.inc"
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#undef PREFIX_UNION
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;
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static constexpr const ArrayRef<StringLiteral>
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PrefixTable(PrefixTable_init, std::size(PrefixTable_init) - 1);
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// Create table mapping all options defined in COFFOptions.td
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static constexpr opt::OptTable::Info infoTable[] = {
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#define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X7, X8, X9, X10, X11, X12) \
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{X1, \
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X2, \
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X10, \
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X11, \
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COFF_OPT_##ID, \
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opt::Option::KIND##Class, \
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X9, \
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X8, \
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COFF_OPT_##GROUP, \
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COFF_OPT_##ALIAS, \
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X7, \
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X12},
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#include "COFFOptions.inc"
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#undef OPTION
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};
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class COFFOptTable : public opt::PrecomputedOptTable {
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public:
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COFFOptTable() : PrecomputedOptTable(infoTable, PrefixTable, true) {}
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};
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static COFFOptTable optTable;
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Expected<opt::InputArgList> COFFDirectiveParser::parse(StringRef Str) {
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SmallVector<StringRef, 16> Tokens;
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SmallVector<const char *, 16> Buffer;
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cl::TokenizeWindowsCommandLineNoCopy(Str, saver, Tokens);
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for (StringRef Tok : Tokens) {
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bool HasNul = Tok.end() != Str.end() && Tok.data()[Tok.size()] == '\0';
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Buffer.push_back(HasNul ? Tok.data() : saver.save(Tok).data());
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}
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unsigned missingIndex;
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unsigned missingCount;
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auto Result = optTable.ParseArgs(Buffer, missingIndex, missingCount);
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if (missingCount)
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return make_error<JITLinkError>(Twine("COFF directive parsing failed: ") +
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Result.getArgString(missingIndex) +
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" missing argument");
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LLVM_DEBUG({
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for (auto *arg : Result.filtered(COFF_OPT_UNKNOWN))
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dbgs() << "Unknown coff option argument: " << arg->getAsString(Result)
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<< "\n";
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});
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return std::move(Result);
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}
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