[flang-commits] [flang] [flang] Silence impossible error about SMP interface incompatibility (PR #112054)
Peter Klausler via flang-commits
flang-commits at lists.llvm.org
Fri Oct 11 15:07:04 PDT 2024
https://github.com/klausler created https://github.com/llvm/llvm-project/pull/112054
It is possible for the compiler to emit an impossible error message about dummy argument character length incompatibility in the case of a MODULE SUBROUTINE or FUNCTION defined later in a submodule with MODULE PROCEDURE, when the character length is defined by USE association in its interface. The checking for separate module procedure interface compatibility needs to use a more flexible check than just operator== on a semantics::ParamValue.
>From 4c73e1568315330b1729a36c0fc566e70454d284 Mon Sep 17 00:00:00 2001
From: Peter Klausler <pklausler at nvidia.com>
Date: Fri, 11 Oct 2024 14:22:26 -0700
Subject: [PATCH] [flang] Silence impossible error about SMP interface
incompatibility
It is possible for the compiler to emit an impossible error message
about dummy argument character length incompatibility in the case
of a MODULE SUBROUTINE or FUNCTION defined later in a submodule
with MODULE PROCEDURE, when the character length is defined by USE
association in its interface. The checking for separate module
procedure interface compatibility needs to use a more flexible
check than just operator== on a semantics::ParamValue.
---
flang/include/flang/Evaluate/tools.h | 6 +++++-
flang/include/flang/Semantics/type.h | 1 +
flang/lib/Evaluate/tools.cpp | 16 ++++++++++++++--
flang/lib/Evaluate/type.cpp | 5 ++++-
flang/lib/Semantics/type.cpp | 6 ++++++
flang/test/Semantics/smp-def01.f90 | 23 +++++++++++++++++++++++
6 files changed, 53 insertions(+), 4 deletions(-)
create mode 100644 flang/test/Semantics/smp-def01.f90
diff --git a/flang/include/flang/Evaluate/tools.h b/flang/include/flang/Evaluate/tools.h
index d2887b69cc6de1..f547138f5a116c 100644
--- a/flang/include/flang/Evaluate/tools.h
+++ b/flang/include/flang/Evaluate/tools.h
@@ -1252,8 +1252,12 @@ class ArrayConstantBoundChanger {
// Predicate: should two expressions be considered identical for the purposes
// of determining whether two procedure interfaces are compatible, modulo
// naming of corresponding dummy arguments?
-std::optional<bool> AreEquivalentInInterface(
+template <typename T>
+std::optional<bool> AreEquivalentInInterface(const Expr<T> &, const Expr<T> &);
+extern template std::optional<bool> AreEquivalentInInterface<SubscriptInteger>(
const Expr<SubscriptInteger> &, const Expr<SubscriptInteger> &);
+extern template std::optional<bool> AreEquivalentInInterface<SomeInteger>(
+ const Expr<SomeInteger> &, const Expr<SomeInteger> &);
bool CheckForCoindexedObject(parser::ContextualMessages &,
const std::optional<ActualArgument> &, const std::string &procName,
diff --git a/flang/include/flang/Semantics/type.h b/flang/include/flang/Semantics/type.h
index e2131e7e160cb6..1292c381b65f72 100644
--- a/flang/include/flang/Semantics/type.h
+++ b/flang/include/flang/Semantics/type.h
@@ -110,6 +110,7 @@ class ParamValue {
return category_ == that.category_ && expr_ == that.expr_;
}
bool operator!=(const ParamValue &that) const { return !(*this == that); }
+ bool IsEquivalentInInterface(const ParamValue &) const;
std::string AsFortran() const;
private:
diff --git a/flang/lib/Evaluate/tools.cpp b/flang/lib/Evaluate/tools.cpp
index c2545a87099426..4d98220a7065ca 100644
--- a/flang/lib/Evaluate/tools.cpp
+++ b/flang/lib/Evaluate/tools.cpp
@@ -1320,8 +1320,10 @@ std::optional<Expr<SomeType>> HollerithToBOZ(FoldingContext &context,
// Extracts a whole symbol being used as a bound of a dummy argument,
// possibly wrapped with parentheses or MAX(0, ...).
+// Works with any integer expression.
+template <typename T> const Symbol *GetBoundSymbol(const Expr<T> &);
template <int KIND>
-static const Symbol *GetBoundSymbol(
+const Symbol *GetBoundSymbol(
const Expr<Type<TypeCategory::Integer, KIND>> &expr) {
using T = Type<TypeCategory::Integer, KIND>;
return common::visit(
@@ -1358,9 +1360,15 @@ static const Symbol *GetBoundSymbol(
},
expr.u);
}
+template <>
+const Symbol *GetBoundSymbol<SomeInteger>(const Expr<SomeInteger> &expr) {
+ return common::visit(
+ [](const auto &kindExpr) { return GetBoundSymbol(kindExpr); }, expr.u);
+}
+template <typename T>
std::optional<bool> AreEquivalentInInterface(
- const Expr<SubscriptInteger> &x, const Expr<SubscriptInteger> &y) {
+ const Expr<T> &x, const Expr<T> &y) {
auto xVal{ToInt64(x)};
auto yVal{ToInt64(y)};
if (xVal && yVal) {
@@ -1394,6 +1402,10 @@ std::optional<bool> AreEquivalentInInterface(
return std::nullopt; // not sure
}
}
+template std::optional<bool> AreEquivalentInInterface<SubscriptInteger>(
+ const Expr<SubscriptInteger> &, const Expr<SubscriptInteger> &);
+template std::optional<bool> AreEquivalentInInterface<SomeInteger>(
+ const Expr<SomeInteger> &, const Expr<SomeInteger> &);
bool CheckForCoindexedObject(parser::ContextualMessages &messages,
const std::optional<ActualArgument> &arg, const std::string &procName,
diff --git a/flang/lib/Evaluate/type.cpp b/flang/lib/Evaluate/type.cpp
index a1df40667471ad..c00688853cd006 100644
--- a/flang/lib/Evaluate/type.cpp
+++ b/flang/lib/Evaluate/type.cpp
@@ -518,7 +518,10 @@ static bool AreSameDerivedType(
bool DynamicType::IsEquivalentTo(const DynamicType &that) const {
return category_ == that.category_ && kind_ == that.kind_ &&
- PointeeComparison(charLengthParamValue_, that.charLengthParamValue_) &&
+ (charLengthParamValue_ == that.charLengthParamValue_ ||
+ (charLengthParamValue_ && that.charLengthParamValue_ &&
+ charLengthParamValue_->IsEquivalentInInterface(
+ *that.charLengthParamValue_))) &&
knownLength().has_value() == that.knownLength().has_value() &&
(!knownLength() || *knownLength() == *that.knownLength()) &&
AreSameDerivedType(derived_, that.derived_);
diff --git a/flang/lib/Semantics/type.cpp b/flang/lib/Semantics/type.cpp
index e867d7ad6e2536..7f5f4e98a7d6c1 100644
--- a/flang/lib/Semantics/type.cpp
+++ b/flang/lib/Semantics/type.cpp
@@ -758,6 +758,12 @@ void ParamValue::SetExplicit(SomeIntExpr &&x) {
expr_ = std::move(x);
}
+bool ParamValue::IsEquivalentInInterface(const ParamValue &that) const {
+ return (category_ == that.category_ &&
+ expr_.has_value() == that.expr_.has_value() &&
+ (!expr_ || evaluate::AreEquivalentInInterface(*expr_, *that.expr_)));
+}
+
std::string ParamValue::AsFortran() const {
switch (category_) {
SWITCH_COVERS_ALL_CASES
diff --git a/flang/test/Semantics/smp-def01.f90 b/flang/test/Semantics/smp-def01.f90
new file mode 100644
index 00000000000000..7169bba4509990
--- /dev/null
+++ b/flang/test/Semantics/smp-def01.f90
@@ -0,0 +1,23 @@
+!RUN: %flang -fsyntax-only %s 2>&1 | FileCheck --allow-empty %s
+!Ensure no bogus error message about incompatible character length
+!CHECK-NOT: error
+
+module m1
+ integer :: n = 1
+end
+
+module m2
+ interface
+ module subroutine s(a,b)
+ use m1
+ character(n) :: a
+ character(n) :: b
+ end
+ end interface
+end
+
+submodule(m2) m2s1
+ contains
+ module procedure s
+ end
+end
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