641ede93ef
This patch plugs many holes in static initializer semantics, improves error messages for default initial values and other component properties in parameterized derived type instantiations, and cleans up several small issues noticed during development. We now do proper scalar expansion, folding, and type, rank, and shape conformance checking for component default initializers in derived types and PDT instantiations. The initial values of named constants are now guaranteed to have been folded when installed in the symbol table, and are no longer folded or scalar-expanded at each use in expression folding. Semantics documentation was extended with information about the various kinds of initializations in Fortran and when each of them are processed in the compiler. Some necessary concomitant changes have bulked this patch out a bit: * contextual messages attachments, which are now produced for parameterized derived type instantiations so that the user can figure out which instance caused a problem with a component, have been added as part of ContextualMessages, and their implementation was debugged * several APIs in evaluate::characteristics was changed so that a FoldingContext is passed as an argument rather than just its intrinsic procedure table; this affected client call sites in many files * new tools in Evaluate/check-expression.cpp to determine when an Expr actually is a single constant value and to validate a non-pointer variable initializer or object component default value * shape conformance checking has additional arguments that control whether scalar expansion is allowed * several now-unused functions and data members noticed and removed * several crashes and bogus errors exposed by testing this new code were fixed * a -fdebug-stack-trace option to enable LLVM's stack tracing on a crash, which might be useful in the future TL;DR: Initialization processing does more and takes place at the right times for all of the various kinds of things that can be initialized. Differential Review: https://reviews.llvm.org/D92783
86 lines
3.7 KiB
Fortran
86 lines
3.7 KiB
Fortran
! RUN: %S/test_errors.sh %s %t %f18
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! Initializer error tests
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subroutine objectpointers(j)
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integer, intent(in) :: j
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real, allocatable, target, save :: x1
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real, codimension[*], target, save :: x2
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real, save :: x3
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real, target :: x4
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real, target, save :: x5(10)
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!ERROR: An initial data target may not be a reference to an ALLOCATABLE 'x1'
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real, pointer :: p1 => x1
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!ERROR: An initial data target may not be a reference to a coarray 'x2'
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real, pointer :: p2 => x2
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!ERROR: An initial data target may not be a reference to an object 'x3' that lacks the TARGET attribute
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real, pointer :: p3 => x3
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!ERROR: An initial data target may not be a reference to an object 'x4' that lacks the SAVE attribute
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real, pointer :: p4 => x4
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!ERROR: An initial data target must be a designator with constant subscripts
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real, pointer :: p5 => x5(j)
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!ERROR: Pointer has rank 0 but target has rank 1
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real, pointer :: p6 => x5
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!TODO: type incompatibility, non-deferred type parameter values, contiguity
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end subroutine
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subroutine dataobjects(j)
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integer, intent(in) :: j
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real, parameter :: x1(*) = [1., 2.]
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!ERROR: Implied-shape parameter 'x2' has rank 2 but its initializer has rank 1
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real, parameter :: x2(*,*) = [1., 2.]
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!ERROR: Named constant 'x3' array must have constant shape
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real, parameter :: x3(j) = [1., 2.]
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!ERROR: Shape of initialized object 'x4' must be constant
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real :: x4(j) = [1., 2.]
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!ERROR: Rank of initialized object is 2, but initialization expression has rank 1
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real :: x5(2,2) = [1., 2., 3., 4.]
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real :: x6(2,2) = 5.
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!ERROR: Rank of initialized object is 0, but initialization expression has rank 1
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real :: x7 = [1.]
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real :: x8(2,2) = reshape([1., 2., 3., 4.], [2, 2])
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!ERROR: Dimension 1 of initialized object has extent 3, but initialization expression has extent 2
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real :: x9(3) = [1., 2.]
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!ERROR: Dimension 1 of initialized object has extent 2, but initialization expression has extent 3
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real :: x10(2,3) = reshape([real::(k,k=1,6)], [3, 2])
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end subroutine
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subroutine components
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real, target, save :: a1(3)
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real, target :: a2
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real, save :: a3
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real, target, save :: a4
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type :: t1
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!ERROR: Dimension 1 of initialized object has extent 2, but initialization expression has extent 3
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real :: x1(2) = [1., 2., 3.]
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end type
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type :: t2(kind, len)
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integer, kind :: kind
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integer, len :: len
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!ERROR: Dimension 1 of initialized object has extent 2, but initialization expression has extent 3
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!ERROR: Dimension 1 of initialized object has extent 2, but initialization expression has extent 3
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real :: x1(2) = [1., 2., 3.]
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!ERROR: Dimension 1 of initialized object has extent 2, but initialization expression has extent 3
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real :: x2(kind) = [1., 2., 3.]
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!ERROR: Dimension 1 of initialized object has extent 2, but initialization expression has extent 3
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!ERROR: An automatic variable or component must not be initialized
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real :: x3(len) = [1., 2., 3.]
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real, pointer :: p1(:) => a1
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!ERROR: An initial data target may not be a reference to an object 'a2' that lacks the SAVE attribute
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!ERROR: An initial data target may not be a reference to an object 'a2' that lacks the SAVE attribute
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real, pointer :: p2 => a2
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!ERROR: An initial data target may not be a reference to an object 'a3' that lacks the TARGET attribute
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!ERROR: An initial data target may not be a reference to an object 'a3' that lacks the TARGET attribute
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real, pointer :: p3 => a3
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!ERROR: Pointer has rank 0 but target has rank 1
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!ERROR: Pointer has rank 0 but target has rank 1
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real, pointer :: p4 => a1
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!ERROR: Pointer has rank 1 but target has rank 0
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!ERROR: Pointer has rank 1 but target has rank 0
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real, pointer :: p5(:) => a4
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end type
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type(t2(3,3)) :: o1
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type(t2(2,2)) :: o2
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end subroutine
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