/// Build a bit set for BitSet using the object layouts in
/// GlobalLayout.
BitSetInfo LowerBitSets::buildBitSet(
Metadata *BitSet,
const DenseMap<GlobalObject *, uint64_t> &GlobalLayout) {
BitSetBuilder BSB;
// Compute the byte offset of each element of this bitset.
if (BitSetNM) {
for (MDNode *Op : BitSetNM->operands()) {
if (Op->getOperand(0) != BitSet || !Op->getOperand(1))
continue;
Constant *OpConst =
cast<ConstantAsMetadata>(Op->getOperand(1))->getValue();
if (auto GA = dyn_cast<GlobalAlias>(OpConst))
OpConst = GA->getAliasee();
auto OpGlobal = dyn_cast<GlobalObject>(OpConst);
if (!OpGlobal)
continue;
uint64_t Offset =
cast<ConstantInt>(cast<ConstantAsMetadata>(Op->getOperand(2))
->getValue())->getZExtValue();
Offset += GlobalLayout.find(OpGlobal)->second;
BSB.addOffset(Offset);
}
}
return BSB.build();
}
/// Build a bit set for TypeId using the object layouts in
/// GlobalLayout.
BitSetInfo LowerTypeTestsModule::buildBitSet(
Metadata *TypeId, const DenseMap<GlobalObject *, uint64_t> &GlobalLayout) {
BitSetBuilder BSB;
// Compute the byte offset of each address associated with this type
// identifier.
SmallVector<MDNode *, 2> Types;
for (auto &GlobalAndOffset : GlobalLayout) {
Types.clear();
GlobalAndOffset.first->getMetadata(LLVMContext::MD_type, Types);
for (MDNode *Type : Types) {
if (Type->getOperand(1) != TypeId)
continue;
uint64_t Offset =
cast<ConstantInt>(
cast<ConstantAsMetadata>(Type->getOperand(0))->getValue())
->getZExtValue();
BSB.addOffset(GlobalAndOffset.second + Offset);
}
}
return BSB.build();
}
TEST(LowerTypeTests, BitSetBuilder) {
struct {
std::vector<uint64_t> Offsets;
std::set<uint64_t> Bits;
uint64_t ByteOffset;
uint64_t BitSize;
unsigned AlignLog2;
bool IsSingleOffset;
bool IsAllOnes;
} BSBTests[] = {
{{}, std::set<uint64_t>{}, 0, 1, 0, false, false},
{{0}, {0}, 0, 1, 0, true, true},
{{4}, {0}, 4, 1, 0, true, true},
{{37}, {0}, 37, 1, 0, true, true},
{{0, 1}, {0, 1}, 0, 2, 0, false, true},
{{0, 4}, {0, 1}, 0, 2, 2, false, true},
{{0, uint64_t(1) << 33}, {0, 1}, 0, 2, 33, false, true},
{{3, 7}, {0, 1}, 3, 2, 2, false, true},
{{0, 1, 7}, {0, 1, 7}, 0, 8, 0, false, false},
{{0, 2, 14}, {0, 1, 7}, 0, 8, 1, false, false},
{{0, 1, 8}, {0, 1, 8}, 0, 9, 0, false, false},
{{0, 2, 16}, {0, 1, 8}, 0, 9, 1, false, false},
{ {0, 1, 2, 3, 4, 5, 6, 7},
{0, 1, 2, 3, 4, 5, 6, 7},
0,
8,
0,
false,
true
},
{ {0, 1, 2, 3, 4, 5, 6, 7, 8},
{0, 1, 2, 3, 4, 5, 6, 7, 8},
0,
9,
0,
false,
true
},
};
for (auto &&T : BSBTests) {
BitSetBuilder BSB;
for (auto Offset : T.Offsets)
BSB.addOffset(Offset);
BitSetInfo BSI = BSB.build();
EXPECT_EQ(T.Bits, BSI.Bits);
EXPECT_EQ(T.ByteOffset, BSI.ByteOffset);
EXPECT_EQ(T.BitSize, BSI.BitSize);
EXPECT_EQ(T.AlignLog2, BSI.AlignLog2);
EXPECT_EQ(T.IsSingleOffset, BSI.isSingleOffset());
EXPECT_EQ(T.IsAllOnes, BSI.isAllOnes());
for (auto Offset : T.Offsets)
EXPECT_TRUE(BSI.containsGlobalOffset(Offset));
auto I = T.Offsets.begin();
for (uint64_t NonOffset = 0; NonOffset != 256; ++NonOffset) {
if (I != T.Offsets.end() && *I == NonOffset) {
++I;
continue;
}
EXPECT_FALSE(BSI.containsGlobalOffset(NonOffset));
}
}
}
