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[flang][runtime] add IsAssumedSize API #93857

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Merged
merged 1 commit into from
May 31, 2024
Merged

[flang][runtime] add IsAssumedSize API #93857

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3 changes: 3 additions & 0 deletions flang/include/flang/Runtime/support.h
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Expand Up @@ -34,6 +34,9 @@ extern "C" {
// Predicate: is the storage described by a Descriptor contiguous in memory?
bool RTDECL(IsContiguous)(const Descriptor &);

// Predicate: is this descriptor describing an assumed-size array?
bool RTDECL(IsAssumedSize)(const Descriptor &);

// Copy "from" descriptor into "to" descriptor and update "to" dynamic type,
// CFI_attribute, and lower bounds according to the other arguments.
// "newDynamicType" may be a null pointer in which case "to" dynamic type is the
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5 changes: 5 additions & 0 deletions flang/runtime/support.cpp
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Expand Up @@ -7,6 +7,7 @@
//===----------------------------------------------------------------------===//

#include "flang/Runtime/support.h"
#include "ISO_Fortran_util.h"
#include "type-info.h"
#include "flang/Runtime/descriptor.h"

Expand All @@ -18,6 +19,10 @@ bool RTDEF(IsContiguous)(const Descriptor &descriptor) {
return descriptor.IsContiguous();
}

bool RTDEF(IsAssumedSize)(const Descriptor &descriptor) {
return ISO::IsAssumedSize(&descriptor.raw());
}

void RTDEF(CopyAndUpdateDescriptor)(Descriptor &to, const Descriptor &from,
const typeInfo::DerivedType *newDynamicType,
ISO::CFI_attribute_t newAttribute, enum LowerBoundModifier newLowerBounds) {
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11 changes: 11 additions & 0 deletions flang/unittests/Runtime/Support.cpp
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Expand Up @@ -56,3 +56,14 @@ TEST(CopyAndUpdateDescriptor, Basic) {
EXPECT_EQ(result.GetDimension(1).Extent(), x->GetDimension(1).Extent());
EXPECT_EQ(result.GetDimension(1).LowerBound(), 1);
}

TEST(IsAssumedSize, Basic) {
auto x{MakeArray<TypeCategory::Integer, 4>(
std::vector<int>{2, 3}, std::vector<std::int32_t>{0, 1, 2, 3, 4, 5})};
EXPECT_FALSE(RTNAME(IsAssumedSize)(*x));
x->GetDimension(1).SetExtent(-1);
EXPECT_TRUE(RTNAME(IsAssumedSize)(*x));
auto scalar{MakeArray<TypeCategory::Integer, 4>(
std::vector<int>{}, std::vector<std::int32_t>{0})};
EXPECT_FALSE(RTNAME(IsAssumedSize)(*scalar));
}
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