12c4be1ba8
Fixes: ``` [113/324] Building CXX object tools\clang\unittests\AST\ByteCode\CMakeFiles\InterpTests.dir\BitcastBuffer.cpp.obj C:\git\llvm-project\clang\unittests\AST\ByteCode\BitcastBuffer.cpp(52): warning C4309: 'initializing': truncation of constant value C:\git\llvm-project\clang\unittests\AST\ByteCode\BitcastBuffer.cpp(53): warning C4309: 'initializing': truncation of constant value ```
88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
#include "../../../lib/AST/ByteCode/BitcastBuffer.h"
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#include "clang/AST/ASTContext.h"
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#include "gtest/gtest.h"
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#include <bitset>
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#include <cassert>
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#include <cmath>
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#include <memory>
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#include <string>
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using namespace clang;
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using namespace clang::interp;
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TEST(BitcastBuffer, PushData) {
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BitcastBuffer Buff1(Bytes(sizeof(int)).toBits());
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const unsigned V = 0xCAFEBABE;
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Bits VSize = Bytes(sizeof(V)).toBits();
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std::byte Data[sizeof(V)];
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std::memcpy(Data, &V, sizeof(V));
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Endian HostEndianness =
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llvm::sys::IsLittleEndianHost ? Endian::Little : Endian::Big;
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Buff1.pushData(Data, Bits::zero(), VSize, HostEndianness);
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// The buffer is in host-endianness.
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if (llvm::sys::IsLittleEndianHost) {
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ASSERT_EQ(Buff1.Data[0], std::byte{0xbe});
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ASSERT_EQ(Buff1.Data[1], std::byte{0xba});
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ASSERT_EQ(Buff1.Data[2], std::byte{0xfe});
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ASSERT_EQ(Buff1.Data[3], std::byte{0xca});
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} else {
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ASSERT_EQ(Buff1.Data[0], std::byte{0xca});
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ASSERT_EQ(Buff1.Data[1], std::byte{0xfe});
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ASSERT_EQ(Buff1.Data[2], std::byte{0xba});
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ASSERT_EQ(Buff1.Data[3], std::byte{0xbe});
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}
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{
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unsigned V2;
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auto D = Buff1.copyBits(Bits::zero(), VSize, VSize, Endian::Little);
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std::memcpy(&V2, D.get(), sizeof(V));
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ASSERT_EQ(V, V2);
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D = Buff1.copyBits(Bits::zero(), VSize, VSize, Endian::Big);
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std::memcpy(&V2, D.get(), sizeof(V));
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ASSERT_EQ(V, V2);
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}
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BitcastBuffer Buff2(Bytes(sizeof(int)).toBits());
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{
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short s1 = (short)0xCAFE;
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short s2 = (short)0xBABE;
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std::byte sdata[2];
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std::memcpy(sdata, &s1, sizeof(s1));
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Buff2.pushData(sdata, Bits::zero(), Bits(sizeof(s1) * 8), HostEndianness);
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std::memcpy(sdata, &s2, sizeof(s2));
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Buff2.pushData(sdata, Bits(sizeof(s1) * 8), Bits(sizeof(s2) * 8),
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HostEndianness);
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}
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if (llvm::sys::IsLittleEndianHost) {
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ASSERT_EQ(Buff2.Data[0], std::byte{0xfe});
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ASSERT_EQ(Buff2.Data[1], std::byte{0xca});
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ASSERT_EQ(Buff2.Data[2], std::byte{0xbe});
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ASSERT_EQ(Buff2.Data[3], std::byte{0xba});
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} else {
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ASSERT_EQ(Buff2.Data[0], std::byte{0xba});
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ASSERT_EQ(Buff2.Data[1], std::byte{0xbe});
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ASSERT_EQ(Buff2.Data[2], std::byte{0xca});
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ASSERT_EQ(Buff2.Data[3], std::byte{0xfe});
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}
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{
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unsigned V;
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auto D = Buff2.copyBits(Bits::zero(), Bits(sizeof(V) * 8),
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Bits(sizeof(V) * 8), Endian::Little);
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std::memcpy(&V, D.get(), sizeof(V));
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ASSERT_EQ(V, 0xBABECAFE);
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D = Buff2.copyBits(Bits::zero(), Bits(sizeof(V) * 8), Bits(sizeof(V) * 8),
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Endian::Big);
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std::memcpy(&V, D.get(), sizeof(V));
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ASSERT_EQ(V, 0xBABECAFE);
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}
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}
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