--- /dev/null
+//===- VersionTuple.h - Version Number Handling -----------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Defines the llvm::VersionTuple class, which represents a version in
+/// the form major[.minor[.subminor]].
+///
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_SUPPORT_VERSIONTUPLE_H
+#define LLVM_SUPPORT_VERSIONTUPLE_H
+
+#include "llvm/ADT/Optional.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/raw_ostream.h"
+#include <string>
+#include <tuple>
+
+namespace llvm {
+
+/// Represents a version number in the form major[.minor[.subminor[.build]]].
+class VersionTuple {
+ unsigned Major : 32;
+
+ unsigned Minor : 31;
+ unsigned HasMinor : 1;
+
+ unsigned Subminor : 31;
+ unsigned HasSubminor : 1;
+
+ unsigned Build : 31;
+ unsigned HasBuild : 1;
+
+public:
+ VersionTuple()
+ : Major(0), Minor(0), HasMinor(false), Subminor(0), HasSubminor(false),
+ Build(0), HasBuild(false) {}
+
+ explicit VersionTuple(unsigned Major)
+ : Major(Major), Minor(0), HasMinor(false), Subminor(0),
+ HasSubminor(false), Build(0), HasBuild(false) {}
+
+ explicit VersionTuple(unsigned Major, unsigned Minor)
+ : Major(Major), Minor(Minor), HasMinor(true), Subminor(0),
+ HasSubminor(false), Build(0), HasBuild(false) {}
+
+ explicit VersionTuple(unsigned Major, unsigned Minor, unsigned Subminor)
+ : Major(Major), Minor(Minor), HasMinor(true), Subminor(Subminor),
+ HasSubminor(true), Build(0), HasBuild(false) {}
+
+ explicit VersionTuple(unsigned Major, unsigned Minor, unsigned Subminor,
+ unsigned Build)
+ : Major(Major), Minor(Minor), HasMinor(true), Subminor(Subminor),
+ HasSubminor(true), Build(Build), HasBuild(true) {}
+
+ /// Determine whether this version information is empty
+ /// (e.g., all version components are zero).
+ bool empty() const {
+ return Major == 0 && Minor == 0 && Subminor == 0 && Build == 0;
+ }
+
+ /// Retrieve the major version number.
+ unsigned getMajor() const { return Major; }
+
+ /// Retrieve the minor version number, if provided.
+ Optional<unsigned> getMinor() const {
+ if (!HasMinor)
+ return None;
+ return Minor;
+ }
+
+ /// Retrieve the subminor version number, if provided.
+ Optional<unsigned> getSubminor() const {
+ if (!HasSubminor)
+ return None;
+ return Subminor;
+ }
+
+ /// Retrieve the build version number, if provided.
+ Optional<unsigned> getBuild() const {
+ if (!HasBuild)
+ return None;
+ return Build;
+ }
+
+ /// Determine if two version numbers are equivalent. If not
+ /// provided, minor and subminor version numbers are considered to be zero.
+ friend bool operator==(const VersionTuple &X, const VersionTuple &Y) {
+ return X.Major == Y.Major && X.Minor == Y.Minor &&
+ X.Subminor == Y.Subminor && X.Build == Y.Build;
+ }
+
+ /// Determine if two version numbers are not equivalent.
+ ///
+ /// If not provided, minor and subminor version numbers are considered to be
+ /// zero.
+ friend bool operator!=(const VersionTuple &X, const VersionTuple &Y) {
+ return !(X == Y);
+ }
+
+ /// Determine whether one version number precedes another.
+ ///
+ /// If not provided, minor and subminor version numbers are considered to be
+ /// zero.
+ friend bool operator<(const VersionTuple &X, const VersionTuple &Y) {
+ return std::tie(X.Major, X.Minor, X.Subminor, X.Build) <
+ std::tie(Y.Major, Y.Minor, Y.Subminor, Y.Build);
+ }
+
+ /// Determine whether one version number follows another.
+ ///
+ /// If not provided, minor and subminor version numbers are considered to be
+ /// zero.
+ friend bool operator>(const VersionTuple &X, const VersionTuple &Y) {
+ return Y < X;
+ }
+
+ /// Determine whether one version number precedes or is
+ /// equivalent to another.
+ ///
+ /// If not provided, minor and subminor version numbers are considered to be
+ /// zero.
+ friend bool operator<=(const VersionTuple &X, const VersionTuple &Y) {
+ return !(Y < X);
+ }
+
+ /// Determine whether one version number follows or is
+ /// equivalent to another.
+ ///
+ /// If not provided, minor and subminor version numbers are considered to be
+ /// zero.
+ friend bool operator>=(const VersionTuple &X, const VersionTuple &Y) {
+ return !(X < Y);
+ }
+
+ /// Retrieve a string representation of the version number.
+ std::string getAsString() const;
+
+ /// Try to parse the given string as a version number.
+ /// \returns \c true if the string does not match the regular expression
+ /// [0-9]+(\.[0-9]+){0,3}
+ bool tryParse(StringRef string);
+};
+
+/// Print a version number.
+raw_ostream &operator<<(raw_ostream &Out, const VersionTuple &V);
+
+} // end namespace llvm
+#endif // LLVM_SUPPORT_VERSIONTUPLE_H
--- /dev/null
+//===- VersionTuple.cpp - Version Number Handling ---------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the VersionTuple class, which represents a version in
+// the form major[.minor[.subminor]].
+//
+//===----------------------------------------------------------------------===//
+#include "llvm/Support/VersionTuple.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace llvm;
+
+std::string VersionTuple::getAsString() const {
+ std::string Result;
+ {
+ llvm::raw_string_ostream Out(Result);
+ Out << *this;
+ }
+ return Result;
+}
+
+raw_ostream &llvm::operator<<(raw_ostream &Out, const VersionTuple &V) {
+ Out << V.getMajor();
+ if (Optional<unsigned> Minor = V.getMinor())
+ Out << '.' << *Minor;
+ if (Optional<unsigned> Subminor = V.getSubminor())
+ Out << '.' << *Subminor;
+ if (Optional<unsigned> Build = V.getBuild())
+ Out << '.' << *Build;
+ return Out;
+}
+
+static bool parseInt(StringRef &input, unsigned &value) {
+ assert(value == 0);
+ if (input.empty())
+ return true;
+
+ char next = input[0];
+ input = input.substr(1);
+ if (next < '0' || next > '9')
+ return true;
+ value = (unsigned)(next - '0');
+
+ while (!input.empty()) {
+ next = input[0];
+ if (next < '0' || next > '9')
+ return false;
+ input = input.substr(1);
+ value = value * 10 + (unsigned)(next - '0');
+ }
+
+ return false;
+}
+
+bool VersionTuple::tryParse(StringRef input) {
+ unsigned major = 0, minor = 0, micro = 0, build = 0;
+
+ // Parse the major version, [0-9]+
+ if (parseInt(input, major))
+ return true;
+
+ if (input.empty()) {
+ *this = VersionTuple(major);
+ return false;
+ }
+
+ // If we're not done, parse the minor version, \.[0-9]+
+ if (input[0] != '.')
+ return true;
+ input = input.substr(1);
+ if (parseInt(input, minor))
+ return true;
+
+ if (input.empty()) {
+ *this = VersionTuple(major, minor);
+ return false;
+ }
+
+ // If we're not done, parse the micro version, \.[0-9]+
+ if (input[0] != '.')
+ return true;
+ input = input.substr(1);
+ if (parseInt(input, micro))
+ return true;
+
+ if (input.empty()) {
+ *this = VersionTuple(major, minor, micro);
+ return false;
+ }
+
+ // If we're not done, parse the micro version, \.[0-9]+
+ if (input[0] != '.')
+ return true;
+ input = input.substr(1);
+ if (parseInt(input, build))
+ return true;
+
+ // If we have characters left over, it's an error.
+ if (!input.empty())
+ return true;
+
+ *this = VersionTuple(major, minor, micro, build);
+ return false;
+}
--- /dev/null
+//===- VersionTupleTests.cpp - Version Number Handling Tests --------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/VersionTuple.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+
+TEST(VersionTuple, getAsString) {
+ EXPECT_EQ("0", VersionTuple().getAsString());
+ EXPECT_EQ("1", VersionTuple(1).getAsString());
+ EXPECT_EQ("1.2", VersionTuple(1, 2).getAsString());
+ EXPECT_EQ("1.2.3", VersionTuple(1, 2, 3).getAsString());
+ EXPECT_EQ("1.2.3.4", VersionTuple(1, 2, 3, 4).getAsString());
+}
+
+TEST(VersionTuple, tryParse) {
+ VersionTuple VT;
+
+ EXPECT_FALSE(VT.tryParse("1"));
+ EXPECT_EQ("1", VT.getAsString());
+
+ EXPECT_FALSE(VT.tryParse("1.2"));
+ EXPECT_EQ("1.2", VT.getAsString());
+
+ EXPECT_FALSE(VT.tryParse("1.2.3"));
+ EXPECT_EQ("1.2.3", VT.getAsString());
+
+ EXPECT_FALSE(VT.tryParse("1.2.3.4"));
+ EXPECT_EQ("1.2.3.4", VT.getAsString());
+
+ EXPECT_TRUE(VT.tryParse(""));
+ EXPECT_TRUE(VT.tryParse("1."));
+ EXPECT_TRUE(VT.tryParse("1.2."));
+ EXPECT_TRUE(VT.tryParse("1.2.3."));
+ EXPECT_TRUE(VT.tryParse("1.2.3.4."));
+ EXPECT_TRUE(VT.tryParse("1.2.3.4.5"));
+ EXPECT_TRUE(VT.tryParse("1-2"));
+ EXPECT_TRUE(VT.tryParse("1+2"));
+ EXPECT_TRUE(VT.tryParse(".1"));
+ EXPECT_TRUE(VT.tryParse(" 1"));
+ EXPECT_TRUE(VT.tryParse("1 "));
+ EXPECT_TRUE(VT.tryParse("."));
+}
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