This revision was automatically updated to reflect the committed changes.
Closed by commit rGc5e1b5e6a99f: [Clang][Sema] Do not evaluate value-dependent
immediate invocations (authored by Izaron, committed by cor3ntin).
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D119375/new/
https://reviews.llvm.org/D119375
Files:
clang/lib/Sema/SemaExpr.cpp
clang/test/SemaCXX/cxx2a-consteval.cpp
Index: clang/test/SemaCXX/cxx2a-consteval.cpp
===================================================================
--- clang/test/SemaCXX/cxx2a-consteval.cpp
+++ clang/test/SemaCXX/cxx2a-consteval.cpp
@@ -613,6 +613,32 @@
} // namespace unevaluated
+namespace value_dependent {
+
+consteval int foo(int x) {
+ return x;
+}
+
+template <int X> constexpr int bar() {
+ // Previously this call was rejected as value-dependent constant expressions
+ // can't be immediately evaluated. Now we show that we don't immediately
+ // evaluate them until they are instantiated.
+ return foo(X);
+}
+
+template <typename T> constexpr int baz() {
+ constexpr int t = sizeof(T);
+ // Previously this call was rejected as `t` is value-dependent and its value
+ // is unknown until the function is instantiated. Now we show that we don't
+ // reject such calls.
+ return foo(t);
+}
+
+static_assert(bar<15>() == 15);
+static_assert(baz<int>() == sizeof(int));
+
+} // namespace value_dependent
+
namespace PR50779 {
struct derp {
int b = 0;
Index: clang/lib/Sema/SemaExpr.cpp
===================================================================
--- clang/lib/Sema/SemaExpr.cpp
+++ clang/lib/Sema/SemaExpr.cpp
@@ -16817,7 +16817,10 @@
ConstantExpr::getStorageKind(Decl->getReturnType().getTypePtr(),
getASTContext()),
/*IsImmediateInvocation*/ true);
- ExprEvalContexts.back().ImmediateInvocationCandidates.emplace_back(Res, 0);
+ /// Value-dependent constant expressions should not be immediately
+ /// evaluated until they are instantiated.
+ if (!Res->isValueDependent())
+ ExprEvalContexts.back().ImmediateInvocationCandidates.emplace_back(Res, 0);
return Res;
}
Index: clang/test/SemaCXX/cxx2a-consteval.cpp
===================================================================
--- clang/test/SemaCXX/cxx2a-consteval.cpp
+++ clang/test/SemaCXX/cxx2a-consteval.cpp
@@ -613,6 +613,32 @@
} // namespace unevaluated
+namespace value_dependent {
+
+consteval int foo(int x) {
+ return x;
+}
+
+template <int X> constexpr int bar() {
+ // Previously this call was rejected as value-dependent constant expressions
+ // can't be immediately evaluated. Now we show that we don't immediately
+ // evaluate them until they are instantiated.
+ return foo(X);
+}
+
+template <typename T> constexpr int baz() {
+ constexpr int t = sizeof(T);
+ // Previously this call was rejected as `t` is value-dependent and its value
+ // is unknown until the function is instantiated. Now we show that we don't
+ // reject such calls.
+ return foo(t);
+}
+
+static_assert(bar<15>() == 15);
+static_assert(baz<int>() == sizeof(int));
+
+} // namespace value_dependent
+
namespace PR50779 {
struct derp {
int b = 0;
Index: clang/lib/Sema/SemaExpr.cpp
===================================================================
--- clang/lib/Sema/SemaExpr.cpp
+++ clang/lib/Sema/SemaExpr.cpp
@@ -16817,7 +16817,10 @@
ConstantExpr::getStorageKind(Decl->getReturnType().getTypePtr(),
getASTContext()),
/*IsImmediateInvocation*/ true);
- ExprEvalContexts.back().ImmediateInvocationCandidates.emplace_back(Res, 0);
+ /// Value-dependent constant expressions should not be immediately
+ /// evaluated until they are instantiated.
+ if (!Res->isValueDependent())
+ ExprEvalContexts.back().ImmediateInvocationCandidates.emplace_back(Res, 0);
return Res;
}
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