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
56 lines
2.6 KiB
Fortran
56 lines
2.6 KiB
Fortran
! RUN: %S/test_errors.sh %s %t %f18
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subroutine s1()
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! C701 (R701) The type-param-value for a kind type parameter shall be a
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! constant expression.
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!
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! C702 (R701) A colon shall not be used as a type-param-value except in the
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! declaration of an entity that has the POINTER or ALLOCATABLE attribute.
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!
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! C704 (R703) In a declaration-type-spec, every type-param-value that is
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! not a colon or an asterisk shall be a specification expression.
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! Section 10.1.11 defines specification expressions
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!
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integer, parameter :: constVal = 1
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integer :: nonConstVal = 1
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!ERROR: Invalid specification expression: reference to local entity 'nonconstval'
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character(nonConstVal) :: colonString1
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character(len=20, kind=constVal + 1) :: constKindString
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character(len=:, kind=constVal + 1), pointer :: constKindString1
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!ERROR: The type parameter LEN cannot be deferred without the POINTER or ALLOCATABLE attribute
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character(len=:, kind=constVal + 1) :: constKindString2
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!ERROR: Must be a constant value
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character(len=20, kind=nonConstVal) :: nonConstKindString
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!ERROR: The type parameter LEN cannot be deferred without the POINTER or ALLOCATABLE attribute
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character(len=:) :: deferredString
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!ERROR: The type parameter LEN cannot be deferred without the POINTER or ALLOCATABLE attribute
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character(:) :: colonString2
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!OK because of the allocatable attribute
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character(:), allocatable :: colonString3
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!ERROR: Must have INTEGER type, but is REAL(4)
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character(3.5) :: badParamValue
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type derived(typeKind, typeLen)
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integer, kind :: typeKind
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integer, len :: typeLen
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end type derived
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type (derived(constVal, 3)) :: constDerivedKind
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!ERROR: Value of kind type parameter 'typekind' (nonconstval) must be a scalar INTEGER constant
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!ERROR: Invalid specification expression: reference to local entity 'nonconstval'
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type (derived(nonConstVal, 3)) :: nonConstDerivedKind
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!OK because all type-params are constants
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type (derived(3, constVal)) :: constDerivedLen
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!ERROR: Invalid specification expression: reference to local entity 'nonconstval'
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type (derived(3, nonConstVal)) :: nonConstDerivedLen
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!ERROR: The value of type parameter 'typelen' cannot be deferred without the POINTER or ALLOCATABLE attribute
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type (derived(3, :)) :: colonDerivedLen
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!ERROR: The value of type parameter 'typekind' cannot be deferred without the POINTER or ALLOCATABLE attribute
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!ERROR: The value of type parameter 'typelen' cannot be deferred without the POINTER or ALLOCATABLE attribute
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type (derived( :, :)) :: colonDerivedLen1
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type (derived( :, :)), pointer :: colonDerivedLen2
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type (derived(4, :)), pointer :: colonDerivedLen3
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end subroutine s1
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