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AsmWriter: Handle broken metadata nodes

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Print out temporary `MDNode`s so we don't crash in the verifier (or
during `dump()` output).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232417 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith 2015-03-16 21:21:10 +00:00
parent 763e18696f
commit bee74a3ad4
2 changed files with 18 additions and 2 deletions
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4
lib/IR/AsmWriter.cpp
View File

@ -1916,10 +1916,10 @@ static void WriteMDNodeBodyInternal(raw_ostream &Out, const MDNode *Node,
TypePrinting *TypePrinter,
SlotTracker *Machine,
const Module *Context) {
assert(!Node->isTemporary() && "Unexpected forward declaration");
if (Node->isDistinct())
Out << "distinct ";
else if (Node->isTemporary())
Out << "<temporary!> "; // Handle broken code.
switch (Node->getMetadataID()) {
default:

16
unittests/IR/MetadataTest.cpp
View File

@ -251,6 +251,22 @@ TEST_F(MDNodeTest, Print) {
EXPECT_EQ(Expected_, Actual_); \
} while (false)
TEST_F(MDNodeTest, PrintTemporary) {
MDNode *Arg = getNode();
TempMDNode Temp = MDNode::getTemporary(Context, Arg);
MDNode *N = getNode(Temp.get());
Module M("test", Context);
NamedMDNode *NMD = M.getOrInsertNamedMetadata("named");
NMD->addOperand(N);
EXPECT_PRINTER_EQ("!0 = !{!1}", N->print(OS, &M));
EXPECT_PRINTER_EQ("!1 = <temporary!> !{!2}", Temp->print(OS, &M));
EXPECT_PRINTER_EQ("!2 = !{}", Arg->print(OS, &M));
// Cleanup.
Temp->replaceAllUsesWith(Arg);
}
TEST_F(MDNodeTest, PrintFromModule) {
Constant *C = ConstantInt::get(Type::getInt32Ty(Context), 7);
MDString *S = MDString::get(Context, "foo");