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[Object] Provide operator< for ELFSymbolRef #89861

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Merged
merged 6 commits into from
Apr 29, 2024
Merged

[Object] Provide operator< for ELFSymbolRef #89861

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b6630e8
[Object] Provide operator< for ELFSymbolRef
aaupov Apr 24, 2024
0e9aab8
Add ELFObjectFileTest::ELFSymbolRefLess
aaupov Apr 24, 2024
978d8fb
Fix typo
aaupov Apr 25, 2024
fb87c76
Added tests, addressed comments
aaupov Apr 26, 2024
2249f8d
Add helper, rename variables, prune redundant checks
aaupov Apr 29, 2024
2437017
Remove tautological comments
aaupov Apr 29, 2024
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66 changes: 47 additions & 19 deletions llvm/unittests/Object/ELFObjectFileTest.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1519,24 +1519,52 @@ TEST(ELFObjectFileTest, ELFSymbolRefLess) {
ASSERT_THAT_EXPECTED(ElfOrErr, Succeeded());
const ELFObjectFile<ELF64LE> &Obj = *ElfOrErr;

llvm::object::DataRefImpl Data1;
Data1.d.a = 0x00000000;
Data1.d.b = 0x00000001;
SymbolRef Symbol1(Data1, &Obj);
ELFSymbolRef ELFSymbol1(Symbol1);

llvm::object::DataRefImpl Data2;
Data2.d.a = 0x00000000;
Data2.d.b = 0x00000100;
SymbolRef Symbol2(Data2, &Obj);
ELFSymbolRef ELFSymbol2(Symbol2);

// SymbolRef operator< uses std::memcmp treating the union as char string.
if (llvm::sys::IsLittleEndianHost)
EXPECT_FALSE(Symbol1 < Symbol2);
else
EXPECT_TRUE(Symbol1 < Symbol2);

// ELFSymbolRef operator< compares struct fields.
const uint32_t Val1 = 0x00000001;
const uint32_t Val2 = 0x00000100;

DataRefImpl Data1, Data2, Data3, Data4;

// Symtab index
Data1.d.a = Data2.d.a = Val1;
Data3.d.a = Data4.d.a = Val2;

// Symbol index
Data1.d.b = Data3.d.b = Val1;
Data2.d.b = Data4.d.b = Val2;

SymbolRef Symbol1(Data1, &Obj), Symbol2(Data2, &Obj), Symbol3(Data3, &Obj),
Symbol4(Data4, &Obj);
ELFSymbolRef ELFSymbol1(Symbol1), ELFSymbol2(Symbol2), ELFSymbol3(Symbol3),
ELFSymbol4(Symbol4);

// Symtab index match
// left sym index is lower
EXPECT_TRUE(ELFSymbol1 < ELFSymbol2);
EXPECT_TRUE(ELFSymbol3 < ELFSymbol4);
// right sym index is lower
EXPECT_FALSE(ELFSymbol2 < ELFSymbol1);
EXPECT_FALSE(ELFSymbol4 < ELFSymbol3);
// sym indexes match
EXPECT_FALSE(ELFSymbol1 < ELFSymbol1);
EXPECT_FALSE(ELFSymbol2 < ELFSymbol2);
EXPECT_FALSE(ELFSymbol3 < ELFSymbol3);
EXPECT_FALSE(ELFSymbol4 < ELFSymbol4);

// Left symtab index is lower
// left sym index is lower
EXPECT_TRUE(ELFSymbol1 < ELFSymbol4);
// right sym index is lower
EXPECT_TRUE(ELFSymbol2 < ELFSymbol3);
// sym indexes match
EXPECT_TRUE(ELFSymbol1 < ELFSymbol3);
EXPECT_TRUE(ELFSymbol2 < ELFSymbol4);

// Right symtab index is lower
// left sym index is lower
EXPECT_FALSE(ELFSymbol3 < ELFSymbol2);
// right sym index is lower
EXPECT_FALSE(ELFSymbol4 < ELFSymbol1);
// sym indexes match
EXPECT_FALSE(ELFSymbol3 < ELFSymbol1);
EXPECT_FALSE(ELFSymbol4 < ELFSymbol2);
}