[clang][bytecode] Remove dummy variables once they are proper globals#166174
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@llvm/pr-subscribers-clang Author: Timm Baeder (tbaederr) ChangesDummy variables have an entry in Fixes #165952 Full diff: https://github.com/llvm/llvm-project/pull/166174.diff 3 Files Affected:
diff --git a/clang/lib/AST/ByteCode/Program.cpp b/clang/lib/AST/ByteCode/Program.cpp
index e0b2852f0e906..2425373ab2ef8 100644
--- a/clang/lib/AST/ByteCode/Program.cpp
+++ b/clang/lib/AST/ByteCode/Program.cpp
@@ -218,21 +218,42 @@ UnsignedOrNone Program::createGlobal(const ValueDecl *VD, const Expr *Init) {
return std::nullopt;
Global *NewGlobal = Globals[*Idx];
+ // Note that this loop has one iteration where Redecl == VD.
for (const Decl *Redecl : VD->redecls()) {
- unsigned &PIdx = GlobalIndices[Redecl];
+
+ // If this redecl was registered as a dummy variable, it is now a proper
+ // global variable and points to the block we just created.
+ if (auto DummyIt = DummyVariables.find(Redecl);
+ DummyIt != DummyVariables.end()) {
+ assert(!Globals[DummyIt->second]->block()->hasPointers());
+ Globals[DummyIt->second] = NewGlobal;
+ DummyVariables.erase(DummyIt);
+ }
+ // If the redeclaration hasn't been registered yet at all, we just set its
+ // global index to Idx. If it has been registered yet, it might have
+ // pointers pointing to it and we need to transfer those pointers to the new
+ // block.
+ auto [Iter, Inserted] = GlobalIndices.try_emplace(Redecl);
+ if (Inserted) {
+ GlobalIndices[Redecl] = *Idx;
+ continue;
+ }
+
if (Redecl != VD) {
- if (Block *RedeclBlock = Globals[PIdx]->block();
+ if (Block *RedeclBlock = Globals[Iter->second]->block();
RedeclBlock->isExtern()) {
- Globals[PIdx] = NewGlobal;
+
// All pointers pointing to the previous extern decl now point to the
// new decl.
// A previous iteration might've already fixed up the pointers for this
// global.
if (RedeclBlock != NewGlobal->block())
RedeclBlock->movePointersTo(NewGlobal->block());
+
+ Globals[Iter->second] = NewGlobal;
}
}
- PIdx = *Idx;
+ Iter->second = *Idx;
}
return *Idx;
diff --git a/clang/lib/AST/ByteCode/Program.h b/clang/lib/AST/ByteCode/Program.h
index 28fcc97f5339d..cc9127dc77860 100644
--- a/clang/lib/AST/ByteCode/Program.h
+++ b/clang/lib/AST/ByteCode/Program.h
@@ -205,7 +205,6 @@ class Program final {
const Block *block() const { return &B; }
private:
- /// Required metadata - does not actually track pointers.
Block B;
};
diff --git a/clang/test/AST/ByteCode/records.cpp b/clang/test/AST/ByteCode/records.cpp
index 83f32c97c50c7..4799ebe25dde1 100644
--- a/clang/test/AST/ByteCode/records.cpp
+++ b/clang/test/AST/ByteCode/records.cpp
@@ -1882,3 +1882,14 @@ namespace MethodWillHaveBody {
}
int n = f(0); // both-note {{instantiation of}}
}
+
+namespace StaticRedecl {
+ struct T {
+ static T tt;
+ constexpr T() : p(&tt) {}
+ T *p;
+ };
+ T T::tt;
+ constexpr T t;
+ static_assert(t.p == &T::tt, "");
+}
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/123/builds/30142 Here is the relevant piece of the build log for the reference |
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Dummy variables have an entry in
Program::Globals, but they are not added toGlobalIndices. When registering redeclarations, we used to only patch up the global indices, but that left the dummy variables alone. Update the dummy variables of all redeclarations as well.Fixes #165952