43fcc262e7
LLDB parses compiler versions out of DW_AT_producer DWARF attributes into a VersionTuple. The Swift compiler recently switched to 5-component version numbers. In order to support this version scheme without growing the size of VersionTuple, this patch dedicates the last 10 bits of the build version to a 5th "sub-build" component. The Swift compiler currently uses 1 digit for this and promises to never use more than 3 digits for the last 3 components. This patch still leaves 6 decimal digits for the build component for other version schemes. rdar://170181060
140 lines
3.6 KiB
C++
140 lines
3.6 KiB
C++
//===- VersionTuple.cpp - Version Number Handling ---------------*- 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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// This file implements the VersionTuple class, which represents a version in
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// the form major[.minor[.subminor]].
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/VersionTuple.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cassert>
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using namespace llvm;
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std::string VersionTuple::getAsString() const {
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std::string Result;
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{
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llvm::raw_string_ostream Out(Result);
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Out << *this;
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}
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return Result;
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}
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raw_ostream &llvm::operator<<(raw_ostream &Out, const VersionTuple &V) {
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Out << V.getMajor();
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if (std::optional<unsigned> Minor = V.getMinor())
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Out << '.' << *Minor;
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if (std::optional<unsigned> Subminor = V.getSubminor())
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Out << '.' << *Subminor;
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if (std::optional<unsigned> Build = V.getBuild())
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Out << '.' << *Build;
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if (std::optional<unsigned> Subbuild = V.getSubbuild())
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Out << '.' << *Subbuild;
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return Out;
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}
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static bool parseInt(StringRef &input, unsigned &value) {
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assert(value == 0);
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if (input.empty())
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return true;
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char next = input[0];
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input = input.substr(1);
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if (next < '0' || next > '9')
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return true;
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value = (unsigned)(next - '0');
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while (!input.empty()) {
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next = input[0];
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if (next < '0' || next > '9')
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return false;
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input = input.substr(1);
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value = value * 10 + (unsigned)(next - '0');
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}
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return false;
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}
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bool VersionTuple::tryParse(StringRef input) {
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unsigned major = 0, minor = 0, subminor = 0, build = 0, subbuild = 0;
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// Parse the major version, [0-9]+
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if (parseInt(input, major))
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return true;
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if (input.empty()) {
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*this = VersionTuple(major);
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return false;
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}
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// If we're not done, parse the minor version, \.[0-9]+
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if (input[0] != '.')
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return true;
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input = input.substr(1);
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if (parseInt(input, minor))
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return true;
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if (input.empty()) {
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*this = VersionTuple(major, minor);
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return false;
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}
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// If we're not done, parse the subminor version, \.[0-9]+
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if (!input.consume_front("."))
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return true;
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if (parseInt(input, subminor))
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return true;
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if (input.empty()) {
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*this = VersionTuple(major, minor, subminor);
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return false;
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}
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// If we're not done, parse the build version, \.[0-9]+
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if (!input.consume_front("."))
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return true;
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if (parseInt(input, build))
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return true;
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if (build >= 1024 * 1024)
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return true;
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if (input.empty()) {
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*this = VersionTuple(major, minor, subminor, build);
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return false;
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}
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// And the subbuild version, \.[0-9]+
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if (!input.consume_front("."))
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return true;
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if (parseInt(input, subbuild))
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return true;
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if (subbuild >= 1024)
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return true;
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// If we have characters left over, it's an error.
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if (!input.empty())
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return true;
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*this = VersionTuple(major, minor, subminor, build, subbuild);
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return false;
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}
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VersionTuple VersionTuple::withMajorReplaced(unsigned NewMajor) const {
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if (HasSubbuild)
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return VersionTuple(NewMajor, Minor, Subminor, Build, Subbuild);
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if (HasBuild)
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return VersionTuple(NewMajor, Minor, Subminor, Build);
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if (HasSubminor)
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return VersionTuple(NewMajor, Minor, Subminor);
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if (HasMinor)
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return VersionTuple(NewMajor, Minor);
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return VersionTuple(NewMajor);
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}
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