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https://github.com/c64scene-ar/llvm-6502.git
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Allow llvm::Optional to work with types without default constructors.
This generalizes Optional to require less from the T type by using aligned storage for backing & placement new/deleting the T into it when necessary. Also includes unit tests. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175580 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie
parent
9bc2c99482
commit
a28eda7e40
@ -17,6 +17,7 @@
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#define LLVM_ADT_OPTIONAL_H
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/AlignOf.h"
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#include <cassert>
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#if LLVM_HAS_RVALUE_REFERENCES
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@ -27,14 +28,22 @@ namespace llvm {
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template<typename T>
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class Optional {
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T x;
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AlignedCharArrayUnion<T> storage;
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bool hasVal;
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public:
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explicit Optional() : x(), hasVal(false) {}
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Optional(const T &y) : x(y), hasVal(true) {}
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explicit Optional() : hasVal(false) {}
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Optional(const T &y) : hasVal(true) {
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new (storage.buffer) T(y);
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}
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Optional(const Optional &O) : hasVal(O.hasVal) {
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if (hasVal)
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new (storage.buffer) T(*O);
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}
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#if LLVM_HAS_RVALUE_REFERENCES
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Optional(T &&y) : x(std::forward<T>(y)), hasVal(true) {}
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Optional(T &&y) : hasVal(true) {
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new (storage.buffer) T(std::forward<T>(y));
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}
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#endif
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static inline Optional create(const T* y) {
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@ -42,22 +51,49 @@ public:
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}
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Optional &operator=(const T &y) {
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x = y;
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hasVal = true;
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if (hasVal)
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**this = y;
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else {
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new (storage.buffer) T(y);
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hasVal = true;
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}
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return *this;
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}
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Optional &operator=(const Optional &O) {
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if (!O)
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Reset();
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else
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*this = *O;
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return *this;
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}
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void Reset() {
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if (hasVal) {
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(*this)->~T();
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hasVal = false;
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}
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}
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~Optional() {
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Reset();
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}
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const T* getPointer() const { assert(hasVal); return &x; }
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const T& getValue() const LLVM_LVALUE_FUNCTION { assert(hasVal); return x; }
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const T* getPointer() const { assert(hasVal); return reinterpret_cast<const T*>(storage.buffer); }
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T* getPointer() { assert(hasVal); return reinterpret_cast<T*>(storage.buffer); }
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const T& getValue() const LLVM_LVALUE_FUNCTION { assert(hasVal); return *getPointer(); }
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T& getValue() LLVM_LVALUE_FUNCTION { assert(hasVal); return *getPointer(); }
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operator bool() const { return hasVal; }
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bool hasValue() const { return hasVal; }
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const T* operator->() const { return getPointer(); }
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const T& operator*() const LLVM_LVALUE_FUNCTION { assert(hasVal); return x; }
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T* operator->() { return getPointer(); }
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const T& operator*() const LLVM_LVALUE_FUNCTION { assert(hasVal); return *getPointer(); }
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T& operator*() LLVM_LVALUE_FUNCTION { assert(hasVal); return *getPointer(); }
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#if LLVM_HAS_RVALUE_REFERENCE_THIS
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T&& getValue() && { assert(hasVal); return std::move(x); }
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T&& operator*() && { assert(hasVal); return std::move(x); }
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T&& getValue() && { assert(hasVal); return std::move(*getPointer()); }
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T&& operator*() && { assert(hasVal); return std::move(*getPointer()); }
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#endif
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};
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@ -19,6 +19,7 @@ set(ADTSources
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IntervalMapTest.cpp
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IntrusiveRefCntPtrTest.cpp
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MapVectorTest.cpp
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OptionalTest.cpp
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PackedVectorTest.cpp
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SCCIteratorTest.cpp
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SmallPtrSetTest.cpp
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173
unittests/ADT/OptionalTest.cpp
Normal file
173
unittests/ADT/OptionalTest.cpp
Normal file
@ -0,0 +1,173 @@
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//===- llvm/unittest/ADT/OptionalTest.cpp - Optional unit tests -----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "gtest/gtest.h"
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#include "llvm/ADT/Optional.h"
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using namespace llvm;
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namespace {
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struct NonDefaultConstructible {
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static unsigned CopyConstructions;
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static unsigned Destructions;
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static unsigned CopyAssignments;
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explicit NonDefaultConstructible(int) {
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}
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NonDefaultConstructible(const NonDefaultConstructible&) {
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++CopyConstructions;
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}
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NonDefaultConstructible &operator=(const NonDefaultConstructible&) {
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++CopyAssignments;
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return *this;
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}
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~NonDefaultConstructible() {
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++Destructions;
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}
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static void ResetCounts() {
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CopyConstructions = 0;
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Destructions = 0;
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CopyAssignments = 0;
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}
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};
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unsigned NonDefaultConstructible::CopyConstructions = 0;
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unsigned NonDefaultConstructible::Destructions = 0;
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unsigned NonDefaultConstructible::CopyAssignments = 0;
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// Test fixture
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class OptionalTest : public testing::Test {
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};
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TEST_F(OptionalTest, NonDefaultConstructibleTest) {
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Optional<NonDefaultConstructible> O;
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EXPECT_FALSE(O);
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}
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TEST_F(OptionalTest, ResetTest) {
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NonDefaultConstructible::ResetCounts();
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Optional<NonDefaultConstructible> O(NonDefaultConstructible(3));
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EXPECT_EQ(1u, NonDefaultConstructible::CopyConstructions);
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EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
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EXPECT_EQ(1u, NonDefaultConstructible::Destructions);
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NonDefaultConstructible::ResetCounts();
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O.Reset();
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EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
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EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
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EXPECT_EQ(1u, NonDefaultConstructible::Destructions);
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}
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TEST_F(OptionalTest, InitializationLeakTest) {
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NonDefaultConstructible::ResetCounts();
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Optional<NonDefaultConstructible>(NonDefaultConstructible(3));
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EXPECT_EQ(1u, NonDefaultConstructible::CopyConstructions);
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EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
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EXPECT_EQ(2u, NonDefaultConstructible::Destructions);
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}
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TEST_F(OptionalTest, CopyConstructionTest) {
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NonDefaultConstructible::ResetCounts();
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{
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Optional<NonDefaultConstructible> A(NonDefaultConstructible(3));
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EXPECT_EQ(1u, NonDefaultConstructible::CopyConstructions);
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EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
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EXPECT_EQ(1u, NonDefaultConstructible::Destructions);
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NonDefaultConstructible::ResetCounts();
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Optional<NonDefaultConstructible> B(A);
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EXPECT_EQ(1u, NonDefaultConstructible::CopyConstructions);
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EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
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EXPECT_EQ(0u, NonDefaultConstructible::Destructions);
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NonDefaultConstructible::ResetCounts();
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}
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EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
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EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
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EXPECT_EQ(2u, NonDefaultConstructible::Destructions);
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}
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TEST_F(OptionalTest, ConstructingCopyAssignmentTest) {
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NonDefaultConstructible::ResetCounts();
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{
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Optional<NonDefaultConstructible> A(NonDefaultConstructible(3));
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Optional<NonDefaultConstructible> B;
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EXPECT_EQ(1u, NonDefaultConstructible::CopyConstructions);
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EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
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EXPECT_EQ(1u, NonDefaultConstructible::Destructions);
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NonDefaultConstructible::ResetCounts();
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B = A;
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EXPECT_EQ(1u, NonDefaultConstructible::CopyConstructions);
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EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
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EXPECT_EQ(0u, NonDefaultConstructible::Destructions);
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NonDefaultConstructible::ResetCounts();
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}
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EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
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EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
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EXPECT_EQ(2u, NonDefaultConstructible::Destructions);
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}
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TEST_F(OptionalTest, CopyingCopyAssignmentTest) {
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NonDefaultConstructible::ResetCounts();
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{
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Optional<NonDefaultConstructible> A(NonDefaultConstructible(3));
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Optional<NonDefaultConstructible> B(NonDefaultConstructible(4));
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EXPECT_EQ(2u, NonDefaultConstructible::CopyConstructions);
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EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
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EXPECT_EQ(2u, NonDefaultConstructible::Destructions);
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NonDefaultConstructible::ResetCounts();
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B = A;
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EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
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EXPECT_EQ(1u, NonDefaultConstructible::CopyAssignments);
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EXPECT_EQ(0u, NonDefaultConstructible::Destructions);
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NonDefaultConstructible::ResetCounts();
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}
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EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
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EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
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EXPECT_EQ(2u, NonDefaultConstructible::Destructions);
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}
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TEST_F(OptionalTest, DeletingCopyAssignmentTest) {
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NonDefaultConstructible::ResetCounts();
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{
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Optional<NonDefaultConstructible> A;
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Optional<NonDefaultConstructible> B(NonDefaultConstructible(3));
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EXPECT_EQ(1u, NonDefaultConstructible::CopyConstructions);
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EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
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EXPECT_EQ(1u, NonDefaultConstructible::Destructions);
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NonDefaultConstructible::ResetCounts();
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B = A;
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EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
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EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
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EXPECT_EQ(1u, NonDefaultConstructible::Destructions);
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NonDefaultConstructible::ResetCounts();
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}
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EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
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EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
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EXPECT_EQ(0u, NonDefaultConstructible::Destructions);
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}
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TEST_F(OptionalTest, NullCopyConstructionTest) {
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NonDefaultConstructible::ResetCounts();
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{
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Optional<NonDefaultConstructible> A;
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Optional<NonDefaultConstructible> B;
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EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
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EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
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EXPECT_EQ(0u, NonDefaultConstructible::Destructions);
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NonDefaultConstructible::ResetCounts();
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B = A;
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EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
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EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
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EXPECT_EQ(0u, NonDefaultConstructible::Destructions);
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NonDefaultConstructible::ResetCounts();
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}
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EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
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EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
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EXPECT_EQ(0u, NonDefaultConstructible::Destructions);
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}
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} // end anonymous namespace
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