llvm-project/flang/test/Semantics/dosemantics03.f90

! RUN: %S/test_errors.sh %s %t %f18 -Mstandard -Werror

! Issue 458 -- semantic checks for a normal DO loop.  The DO variable
! and the initial, final, and step expressions must be INTEGER if the
! options for standard conformance and turning warnings into errors
! are both in effect.  This test turns on the options for standards
! conformance and turning warnings into errors.  This produces error
! messages for the cases where REAL and DOUBLE PRECISION variables
! and expressions are used in the DO controls.

! C1120 -- DO variable (and associated expressions) must be INTEGER.
! This is extended by allowing REAL and DOUBLE PRECISION

MODULE share
  INTEGER :: intvarshare
  REAL :: realvarshare
  DOUBLE PRECISION :: dpvarshare
END MODULE share

PROGRAM do_issue_458
  USE share
  IMPLICIT NONE
  INTEGER :: ivar
  REAL :: rvar
  DOUBLE PRECISION :: dvar
  LOGICAL :: lvar
  COMPLEX :: cvar
  CHARACTER :: chvar
  INTEGER, DIMENSION(3) :: avar
  TYPE derived
    REAL :: first
    INTEGER :: second
  END TYPE derived
  TYPE(derived) :: devar
  INTEGER, POINTER :: pivar
  REAL, POINTER :: prvar
  DOUBLE PRECISION, POINTER :: pdvar
  LOGICAL, POINTER :: plvar
  INTERFACE
    SUBROUTINE sub()
    END SUBROUTINE sub
    FUNCTION ifunc()
    END FUNCTION ifunc
  END INTERFACE
  PROCEDURE(ifunc), POINTER :: pifunc => NULL()

! DO variables
! INTEGER DO variable
  DO ivar = 1, 10, 3
    PRINT *, "ivar is: ", ivar
  END DO

! REAL DO variable
  DO rvar = 1, 10, 3
    PRINT *, "rvar is: ", rvar
  END DO

! DOUBLE PRECISISON DO variable
  DO dvar = 1, 10, 3
    PRINT *, "dvar is: ", dvar
  END DO

! Pointer to INTEGER DO variable
  ALLOCATE(pivar)
  DO pivar = 1, 10, 3
    PRINT *, "pivar is: ", pivar
  END DO

! Pointer to REAL DO variable
  ALLOCATE(prvar)
  DO prvar = 1, 10, 3
    PRINT *, "prvar is: ", prvar
  END DO

! Pointer to DOUBLE PRECISION DO variable
  ALLOCATE(pdvar)
  DO pdvar = 1, 10, 3
    PRINT *, "pdvar is: ", pdvar
  END DO

! CHARACTER DO variable
!ERROR: DO controls should be INTEGER
  DO chvar = 1, 10, 3
    PRINT *, "chvar is: ", chvar
  END DO

! LOGICAL DO variable
!ERROR: DO controls should be INTEGER
  DO lvar = 1, 10, 3
    PRINT *, "lvar is: ", lvar
  END DO

! COMPLEX DO variable
!ERROR: DO controls should be INTEGER
  DO cvar = 1, 10, 3
    PRINT *, "cvar is: ", cvar
  END DO

! Derived type DO variable
!ERROR: DO controls should be INTEGER
  DO devar = 1, 10, 3
    PRINT *, "devar is: ", devar
  END DO

! Pointer to LOGICAL DO variable
  ALLOCATE(plvar)
!ERROR: DO controls should be INTEGER
  DO plvar = 1, 10, 3
    PRINT *, "plvar is: ", plvar
  END DO

! SUBROUTINE DO variable
!ERROR: DO control must be an INTEGER variable
  DO sub = 1, 10, 3
    PRINT *, "ivar is: ", ivar
  END DO

! FUNCTION DO variable
!ERROR: DO control must be an INTEGER variable
  DO ifunc = 1, 10, 3
    PRINT *, "ivar is: ", ivar
  END DO

! POINTER to FUNCTION DO variable
!ERROR: DO control must be an INTEGER variable
  DO pifunc = 1, 10, 3
    PRINT *, "ivar is: ", ivar
  END DO

! Array DO variable
!ERROR: Must be a scalar value, but is a rank-1 array
  DO avar = 1, 10, 3
    PRINT *, "plvar is: ", plvar
  END DO

! Undeclared DO variable
!ERROR: No explicit type declared for 'undeclared'
  DO undeclared = 1, 10, 3
    PRINT *, "plvar is: ", plvar
  END DO

! Shared association INTEGER DO variable
  DO intvarshare = 1, 10, 3
    PRINT *, "ivar is: ", ivar
  END DO

! Shared association REAL DO variable
  DO realvarshare = 1, 10, 3
    PRINT *, "ivar is: ", ivar
  END DO

! Shared association DOUBLE PRECISION DO variable
  DO dpvarshare = 1, 10, 3
    PRINT *, "ivar is: ", ivar
  END DO

! Initial expressions
! REAL initial expression
  DO ivar = rvar, 10, 3
    PRINT *, "ivar is: ", ivar
  END DO

! DOUBLE PRECISION initial expression
  DO ivar = dvar, 10, 3
    PRINT *, "ivar is: ", ivar
  END DO

! Pointer to INTEGER initial expression
  DO ivar = pivar, 10, 3
    PRINT *, "ivar is: ", ivar
  END DO

! Pointer to REAL initial expression
  DO ivar = prvar, 10, 3
    PRINT *, "ivar is: ", ivar
  END DO

! Pointer to DOUBLE PRECISION initial expression
  DO ivar = pdvar, 10, 3
    PRINT *, "ivar is: ", ivar
  END DO

! LOGICAL initial expression
!ERROR: DO controls should be INTEGER
  DO ivar = lvar, 10, 3
    PRINT *, "ivar is: ", ivar
  END DO

! COMPLEX initial expression
!ERROR: DO controls should be INTEGER
  DO ivar = cvar, 10, 3
    PRINT *, "ivar is: ", ivar
  END DO

! Derived type initial expression
!ERROR: DO controls should be INTEGER
  DO ivar = devar, 10, 3
    PRINT *, "ivar is: ", ivar
  END DO

! Pointer to LOGICAL initial expression
!ERROR: DO controls should be INTEGER
  DO ivar = plvar, 10, 3
    PRINT *, "ivar is: ", ivar
  END DO

! Invalid initial expression
!ERROR: Integer literal is too large for INTEGER(KIND=4)
  DO ivar = -2147483648_4, 10, 3
    PRINT *, "ivar is: ", ivar
  END DO

! Final expression
! REAL final expression
  DO ivar = 1, rvar, 3
    PRINT *, "ivar is: ", ivar
  END DO

! DOUBLE PRECISION final expression
  DO ivar = 1, dvar, 3
    PRINT *, "ivar is: ", ivar
  END DO

! Pointer to INTEGER final expression
  DO ivar = 1, pivar, 3
    PRINT *, "ivar is: ", ivar
  END DO

! Pointer to REAL final expression
  DO ivar = 1, prvar, 3
    PRINT *, "ivar is: ", ivar
  END DO

! Pointer to DOUBLE PRECISION final expression
  DO ivar = pdvar, 10, 3
    PRINT *, "ivar is: ", ivar
  END DO

! COMPLEX final expression
!ERROR: DO controls should be INTEGER
  DO ivar = 1, cvar, 3
    PRINT *, "ivar is: ", ivar
  END DO

! Invalid final expression
!ERROR: Integer literal is too large for INTEGER(KIND=4)
  DO ivar = 1, -2147483648_4, 3
    PRINT *, "ivar is: ", ivar
  END DO

! Step expression
! REAL step expression
  DO ivar = 1, 10, rvar
    PRINT *, "ivar is: ", ivar
  END DO

! DOUBLE PRECISION step expression
  DO ivar = 1, 10, dvar
    PRINT *, "ivar is: ", ivar
  END DO

! Pointer to INTEGER step expression
  DO ivar = 1, 10, pivar
    PRINT *, "ivar is: ", ivar
  END DO

! Pointer to REAL step expression
  DO ivar = 1, 10, prvar
    PRINT *, "ivar is: ", ivar
  END DO

! Pointer to DOUBLE PRECISION step expression
  DO ivar = 1, 10, pdvar
    PRINT *, "ivar is: ", ivar
  END DO

! COMPLEX Step expression
!ERROR: DO controls should be INTEGER
  DO ivar = 1, 10, cvar
    PRINT *, "ivar is: ", ivar
  END DO

! Invalid step expression
!ERROR: Integer literal is too large for INTEGER(KIND=4)
  DO ivar = 1, 10, -2147483648_4
    PRINT *, "ivar is: ", ivar
  END DO

END PROGRAM do_issue_458