[flang][runtime] Preserve type when remapping monomorphic pointers#149427
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[flang][runtime] Preserve type when remapping monomorphic pointers#149427
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@llvm/pr-subscribers-flang-fir-hlfir Author: Peter Klausler (klausler) ChangesPointer associations unconditionally update the element byte size and derived type of the pointer's descriptor. This is okay when the pointer is polymorphic, but not when a pointer is associated with an extended type. To communicate this monomorphic case to the runtime, add new entry points, so as to not break forward binary compatibility. Fixes #149353. Full diff: https://github.com/llvm/llvm-project/pull/149427.diff 9 Files Affected:
diff --git a/flang-rt/include/flang-rt/runtime/descriptor.h b/flang-rt/include/flang-rt/runtime/descriptor.h
index 68106f3462c9b..bc5a5b5f14697 100644
--- a/flang-rt/include/flang-rt/runtime/descriptor.h
+++ b/flang-rt/include/flang-rt/runtime/descriptor.h
@@ -478,7 +478,8 @@ class Descriptor {
const SubscriptValue *upper = nullptr,
const SubscriptValue *stride = nullptr);
- RT_API_ATTRS void ApplyMold(const Descriptor &, int rank);
+ RT_API_ATTRS void ApplyMold(
+ const Descriptor &, int rank, bool isMonomorphic = false);
RT_API_ATTRS void Check() const;
diff --git a/flang-rt/lib/runtime/descriptor.cpp b/flang-rt/lib/runtime/descriptor.cpp
index b723acdd27bd5..e735116bc7c28 100644
--- a/flang-rt/lib/runtime/descriptor.cpp
+++ b/flang-rt/lib/runtime/descriptor.cpp
@@ -252,18 +252,21 @@ RT_API_ATTRS bool Descriptor::EstablishPointerSection(const Descriptor &source,
return CFI_section(&raw_, &source.raw_, lower, upper, stride) == CFI_SUCCESS;
}
-RT_API_ATTRS void Descriptor::ApplyMold(const Descriptor &mold, int rank) {
- raw_.elem_len = mold.raw_.elem_len;
+RT_API_ATTRS void Descriptor::ApplyMold(
+ const Descriptor &mold, int rank, bool isMonomorphic) {
raw_.rank = rank;
- raw_.type = mold.raw_.type;
for (int j{0}; j < rank && j < mold.raw_.rank; ++j) {
GetDimension(j) = mold.GetDimension(j);
}
- if (auto *addendum{Addendum()}) {
- if (auto *moldAddendum{mold.Addendum()}) {
- *addendum = *moldAddendum;
- } else {
- INTERNAL_CHECK(!addendum->derivedType());
+ if (!isMonomorphic) {
+ raw_.elem_len = mold.raw_.elem_len;
+ raw_.type = mold.raw_.type;
+ if (auto *addendum{Addendum()}) {
+ if (auto *moldAddendum{mold.Addendum()}) {
+ *addendum = *moldAddendum;
+ } else {
+ INTERNAL_CHECK(!addendum->derivedType());
+ }
}
}
}
diff --git a/flang-rt/lib/runtime/pointer.cpp b/flang-rt/lib/runtime/pointer.cpp
index 04487abd3272e..5aea501e00487 100644
--- a/flang-rt/lib/runtime/pointer.cpp
+++ b/flang-rt/lib/runtime/pointer.cpp
@@ -71,6 +71,20 @@ void RTDEF(PointerAssociate)(Descriptor &pointer, const Descriptor &target) {
pointer.raw().attribute = CFI_attribute_pointer;
}
+void RTDEF(PointerAssociateMonomorphic)(
+ Descriptor &pointer, const Descriptor &target) {
+ DescriptorAddendum *addendum{pointer.Addendum()};
+ const typeInfo::DerivedType *derived{
+ addendum ? addendum->derivedType() : nullptr};
+ std::size_t elementBytes{pointer.ElementBytes()};
+ RTNAME(PointerAssociate)(pointer, target);
+ // Restore the original type information for a monomophic pointer
+ if (addendum) {
+ addendum->set_derivedType(derived);
+ }
+ pointer.raw().elem_len = elementBytes;
+}
+
void RTDEF(PointerAssociateLowerBounds)(Descriptor &pointer,
const Descriptor &target, const Descriptor &lowerBounds) {
pointer = target;
@@ -87,9 +101,9 @@ void RTDEF(PointerAssociateLowerBounds)(Descriptor &pointer,
}
}
-void RTDEF(PointerAssociateRemapping)(Descriptor &pointer,
+static void RT_API_ATTRS PointerRemapping(Descriptor &pointer,
const Descriptor &target, const Descriptor &bounds, const char *sourceFile,
- int sourceLine) {
+ int sourceLine, bool isMonomorphic) {
Terminator terminator{sourceFile, sourceLine};
SubscriptValue byteStride{/*captured from first dimension*/};
std::size_t boundElementBytes{bounds.ElementBytes()};
@@ -99,7 +113,7 @@ void RTDEF(PointerAssociateRemapping)(Descriptor &pointer,
// the ranks may mismatch. Use target as a mold for initializing
// the pointer descriptor.
INTERNAL_CHECK(static_cast<std::size_t>(pointer.rank()) == boundsRank);
- pointer.ApplyMold(target, boundsRank);
+ pointer.ApplyMold(target, boundsRank, isMonomorphic);
pointer.set_base_addr(target.raw().base_addr);
pointer.raw().attribute = CFI_attribute_pointer;
for (unsigned j{0}; j < boundsRank; ++j) {
@@ -124,6 +138,19 @@ void RTDEF(PointerAssociateRemapping)(Descriptor &pointer,
}
}
+void RTDEF(PointerAssociateRemapping)(Descriptor &pointer,
+ const Descriptor &target, const Descriptor &bounds, const char *sourceFile,
+ int sourceLine) {
+ PointerRemapping(
+ pointer, target, bounds, sourceFile, sourceLine, /*isMonomorphic=*/false);
+}
+void RTDEF(PointerAssociateRemappingMonomorphic)(Descriptor &pointer,
+ const Descriptor &target, const Descriptor &bounds, const char *sourceFile,
+ int sourceLine) {
+ PointerRemapping(
+ pointer, target, bounds, sourceFile, sourceLine, /*isMonomorphic=*/true);
+}
+
RT_API_ATTRS void *AllocateValidatedPointerPayload(
std::size_t byteSize, int allocatorIdx) {
// Add space for a footer to validate during deallocation.
diff --git a/flang/include/flang/Lower/Runtime.h b/flang/include/flang/Lower/Runtime.h
index 77e98a1e019e7..6c6b27fafefd4 100644
--- a/flang/include/flang/Lower/Runtime.h
+++ b/flang/include/flang/Lower/Runtime.h
@@ -67,10 +67,11 @@ void genUnlockStatement(AbstractConverter &, const parser::UnlockStmt &);
void genPauseStatement(AbstractConverter &, const parser::PauseStmt &);
void genPointerAssociate(fir::FirOpBuilder &, mlir::Location,
- mlir::Value pointer, mlir::Value target);
+ mlir::Value pointer, mlir::Value target,
+ bool isMonomorphic);
void genPointerAssociateRemapping(fir::FirOpBuilder &, mlir::Location,
mlir::Value pointer, mlir::Value target,
- mlir::Value bounds);
+ mlir::Value bounds, bool isMonomorphic);
void genPointerAssociateLowerBounds(fir::FirOpBuilder &, mlir::Location,
mlir::Value pointer, mlir::Value target,
mlir::Value lbounds);
diff --git a/flang/include/flang/Optimizer/Builder/Runtime/Intrinsics.h b/flang/include/flang/Optimizer/Builder/Runtime/Intrinsics.h
index 9ca4b2baeaa65..a01dad8e40d0a 100644
--- a/flang/include/flang/Optimizer/Builder/Runtime/Intrinsics.h
+++ b/flang/include/flang/Optimizer/Builder/Runtime/Intrinsics.h
@@ -34,10 +34,11 @@ mlir::Value genAssociated(fir::FirOpBuilder &, mlir::Location,
mlir::Value pointer, mlir::Value target);
void genPointerAssociate(fir::FirOpBuilder &, mlir::Location,
- mlir::Value pointer, mlir::Value target);
+ mlir::Value pointer, mlir::Value target,
+ bool isMonomorphic);
void genPointerAssociateRemapping(fir::FirOpBuilder &, mlir::Location,
mlir::Value pointer, mlir::Value target,
- mlir::Value bounds);
+ mlir::Value bounds, bool isMonomorphic);
mlir::Value genCpuTime(fir::FirOpBuilder &, mlir::Location);
void genDateAndTime(fir::FirOpBuilder &, mlir::Location,
diff --git a/flang/include/flang/Runtime/pointer.h b/flang/include/flang/Runtime/pointer.h
index 83472ee59d2ab..9bca99cc3d1d9 100644
--- a/flang/include/flang/Runtime/pointer.h
+++ b/flang/include/flang/Runtime/pointer.h
@@ -52,7 +52,10 @@ void RTDECL(PointerAssociateScalar)(Descriptor &, void *);
// Associates a pointer with a target of the same rank, possibly with new lower
// bounds, which are passed in a vector whose length must equal the rank.
+// Use the Monomorphic form if the pointer's type shouldn't change.
void RTDECL(PointerAssociate)(Descriptor &, const Descriptor &target);
+void RTDECL(PointerAssociateMonomorphic)(
+ Descriptor &, const Descriptor &target);
void RTDECL(PointerAssociateLowerBounds)(
Descriptor &, const Descriptor &target, const Descriptor &lowerBounds);
@@ -62,6 +65,9 @@ void RTDECL(PointerAssociateLowerBounds)(
void RTDECL(PointerAssociateRemapping)(Descriptor &, const Descriptor &target,
const Descriptor &bounds, const char *sourceFile = nullptr,
int sourceLine = 0);
+void RTDECL(PointerAssociateRemappingMonomorphic)(Descriptor &,
+ const Descriptor &target, const Descriptor &bounds,
+ const char *sourceFile = nullptr, int sourceLine = 0);
// Data pointer allocation and deallocation
diff --git a/flang/lib/Lower/Bridge.cpp b/flang/lib/Lower/Bridge.cpp
index 33c1f1e7a3c3a..f4da50174464a 100644
--- a/flang/lib/Lower/Bridge.cpp
+++ b/flang/lib/Lower/Bridge.cpp
@@ -4517,7 +4517,8 @@ class FirConverter : public Fortran::lower::AbstractConverter {
boundsDesc);
return;
}
- Fortran::lower::genPointerAssociate(*builder, loc, lhs, rhs);
+ Fortran::lower::genPointerAssociate(*builder, loc, lhs, rhs,
+ /*isMonomorphic=*/false);
return;
}
@@ -4703,8 +4704,9 @@ class FirConverter : public Fortran::lower::AbstractConverter {
mlir::Value lhs = lhsMutableBox.getAddr();
mlir::Value rhs = fir::getBase(genExprBox(loc, assign.rhs, stmtCtx));
mlir::Value boundsDesc = createBoundArray(lbounds, ubounds, loc);
- Fortran::lower::genPointerAssociateRemapping(*builder, loc, lhs, rhs,
- boundsDesc);
+ Fortran::lower::genPointerAssociateRemapping(
+ *builder, loc, lhs, rhs, boundsDesc,
+ lhsType && !lhsType->IsPolymorphic());
return;
}
if (!lowerToHighLevelFIR() && explicitIterationSpace()) {
diff --git a/flang/lib/Lower/Runtime.cpp b/flang/lib/Lower/Runtime.cpp
index 2be5ef76e46b8..bf3f5305c17d8 100644
--- a/flang/lib/Lower/Runtime.cpp
+++ b/flang/lib/Lower/Runtime.cpp
@@ -205,22 +205,28 @@ void Fortran::lower::genPauseStatement(
void Fortran::lower::genPointerAssociate(fir::FirOpBuilder &builder,
mlir::Location loc,
mlir::Value pointer,
- mlir::Value target) {
+ mlir::Value target,
+ bool isMonomorphic) {
mlir::func::FuncOp func =
- fir::runtime::getRuntimeFunc<mkRTKey(PointerAssociate)>(loc, builder);
+ isMonomorphic
+ ? fir::runtime::getRuntimeFunc<mkRTKey(PointerAssociateMonomorphic)>(
+ loc, builder)
+ : fir::runtime::getRuntimeFunc<mkRTKey(PointerAssociate)>(loc,
+ builder);
llvm::SmallVector<mlir::Value> args = fir::runtime::createArguments(
builder, loc, func.getFunctionType(), pointer, target);
builder.create<fir::CallOp>(loc, func, args);
}
-void Fortran::lower::genPointerAssociateRemapping(fir::FirOpBuilder &builder,
- mlir::Location loc,
- mlir::Value pointer,
- mlir::Value target,
- mlir::Value bounds) {
+void Fortran::lower::genPointerAssociateRemapping(
+ fir::FirOpBuilder &builder, mlir::Location loc, mlir::Value pointer,
+ mlir::Value target, mlir::Value bounds, bool isMonomorphic) {
mlir::func::FuncOp func =
- fir::runtime::getRuntimeFunc<mkRTKey(PointerAssociateRemapping)>(loc,
- builder);
+ isMonomorphic
+ ? fir::runtime::getRuntimeFunc<mkRTKey(
+ PointerAssociateRemappingMonomorphic)>(loc, builder)
+ : fir::runtime::getRuntimeFunc<mkRTKey(PointerAssociateRemapping)>(
+ loc, builder);
auto fTy = func.getFunctionType();
auto sourceFile = fir::factory::locationToFilename(builder, loc);
auto sourceLine =
diff --git a/flang/test/Lower/polymorphic.f90 b/flang/test/Lower/polymorphic.f90
index b7be5f685d9e3..1c1bc78e9b34a 100644
--- a/flang/test/Lower/polymorphic.f90
+++ b/flang/test/Lower/polymorphic.f90
@@ -178,6 +178,17 @@ subroutine polymorphic_to_nonpolymorphic(p)
! CHECK-LABEL: func.func @_QMpolymorphic_testPpolymorphic_to_nonpolymorphic
! Just checking that FIR is generated without error.
+ subroutine nonpolymorphic_to_polymorphic(p, t)
+ type p1
+ end type
+ type(p1), pointer :: p(:)
+ class(p1), target :: t(:)
+ p(0:1) => t
+ end subroutine
+
+! CHECK-LABEL: func.func @_QMpolymorphic_testPnonpolymorphic_to_polymorphic
+! CHECK: fir.call @_FortranAPointerAssociateRemappingMonomorphic
+
! Test that lowering does not crash for function return with unlimited
! polymoprhic value.
|
Pointer remappings unconditionally update the element byte size and derived type of the pointer's descriptor. This is okay when the pointer is polymorphic, but not when a pointer is associated with an extended type. To communicate this monomorphic case to the runtime, add a new entry point so as to not break forward binary compatibility. Fixes llvm#149353.
klausler
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This was referenced Jul 23, 2025
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Pointer remappings unconditionally update the element byte size and derived type of the pointer's descriptor. This is okay when the pointer is polymorphic, but not when a pointer is associated with an extended type.
To communicate this monomorphic case to the runtime, add a new entry point so as to not break forward binary compatibility.
Fixed #149353.