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Imported Upstream version 5.18.0.182
Former-commit-id: f9d55cf82631bfd710c387739687e5845296aea1
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// Compile with "cl /c /Zi /GR- SimplePaddingTest.cpp"
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// Link with "link SimplePaddingTest.obj /debug /nodefaultlib /entry:main"
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#include <stdint.h>
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extern "C" using at_exit_handler = void();
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int atexit(at_exit_handler handler) { return 0; }
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struct SimplePadNoPadding {
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int32_t X;
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int32_t Y;
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// No padding anywhere, sizeof(T) = 8
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} A;
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struct SimplePadUnion {
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union {
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int32_t X;
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int64_t Y;
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struct {
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int32_t X;
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// 4 bytes of padding here
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int64_t Y;
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} Z;
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};
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// Since the padding occurs at a location that is occupied by other storage
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// (namely the Y member), the storage will still be considered used, and so
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// there will be no unused bytes in the larger class. But in the debug
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// info for the nested struct, we should see padding.
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// sizeof(SimplePadUnion) == sizeof(Z) == 16
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} B;
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struct SimplePadNoPadding2 {
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bool A;
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bool B;
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bool C;
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bool D;
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// No padding anywhere, sizeof(T) = 4
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} C;
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struct alignas(4) SimplePadFields1 {
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char A;
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char B;
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char C;
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// 1 byte of padding here, sizeof(T) = 4
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} E;
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struct SimplePadFields2 {
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int32_t Y;
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char X;
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} F;
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struct SimplePadBase {
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// Make sure this class is 4 bytes, and the derived class requires 8 byte
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// alignment, so that padding is inserted between base and derived.
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int32_t X;
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// No padding here
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} G;
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struct SimplePadDerived : public SimplePadBase {
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// 4 bytes of padding here due to Y requiring 8 byte alignment.
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// Thus, sizeof(T) = 16
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int64_t Y;
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} H;
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struct SimplePadEmptyBase1 {};
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struct SimplePadEmptyBase2 {};
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struct SimplePadEmpty : public SimplePadEmptyBase1, SimplePadEmptyBase2 {
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// Bases have to occupy at least 1 byte of storage, so this requires
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// 2 bytes of padding, plus 1 byte for each base, yielding sizeof(T) = 8
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int32_t X;
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} I;
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struct SimplePadVfptr {
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virtual ~SimplePadVfptr() {}
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static void operator delete(void *ptr, size_t sz) {}
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int32_t X;
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} J;
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struct NonEmptyBase1 {
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bool X;
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};
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struct NonEmptyBase2 {
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bool Y;
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};
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struct SimplePadMultiInherit : public NonEmptyBase1, public NonEmptyBase2 {
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// X and Y from the 2 bases will get squished together, leaving 2 bytes
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// of padding necessary for proper alignment of an int32.
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// Therefore, sizeof(T) = 2 + 2 + 4 = 8
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int32_t X;
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} K;
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struct SimplePadMultiInherit2 : public SimplePadFields1, SimplePadFields2 {
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// There should be 1 byte of padding after the first class, and
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// 3 bytes of padding after the second class.
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int32_t X;
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} L;
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struct OneLevelInherit : public NonEmptyBase1 {
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short Y;
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};
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struct SimplePadTwoLevelInherit : public OneLevelInherit {
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// OneLevelInherit has nested padding because of its base,
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// and then padding again because of this class. So each
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// class should be 4 bytes, yielding sizeof(T) = 12.
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int64_t Z;
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} M;
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struct SimplePadAggregate {
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NonEmptyBase1 X;
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int32_t Y;
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// the presence of X will cause 3 bytes of padding to be injected.
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SimplePadFields1 Fields;
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} N;
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struct SimplePadVtable1 {
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static void operator delete(void *ptr, size_t sz) {}
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virtual ~SimplePadVtable1() {}
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virtual void A1() {}
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virtual void B1() {}
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} O;
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struct SimplePadVtable2 {
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static void operator delete(void *ptr, size_t sz) {}
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virtual ~SimplePadVtable2() {}
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virtual void X2() {}
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virtual void Y2() {}
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virtual void Z2() {}
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} P;
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struct SimplePadVtable3 {
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static void operator delete(void *ptr, size_t sz) {}
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virtual ~SimplePadVtable3() {}
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virtual void Foo3() {}
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virtual void Bar3() {}
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virtual void Baz3() {}
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virtual void Buzz3() {}
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} Q;
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struct SimplePadMultiVTables
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: public SimplePadVtable1,
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public SimplePadVtable2,
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public SimplePadVtable3 {
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~SimplePadMultiVTables() override {}
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static void operator delete(void *ptr, size_t sz) {}
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// SimplePadVtable1 overrides
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void A1() override {}
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// SimplePadVtable2 overrides
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void Y2() override {}
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void Z2() override {}
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// SimplePadVtable3 overrides
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void Bar3() override {}
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void Baz3() override {}
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void Buzz3() override {}
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} R;
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int main(int argc, char **argv) {
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return 0;
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}
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