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[flang][runtime] Initialize uninitialized pointer components
Pointer components without default initialization pose some difficult (or impossible) problems when they appear as right-hand side targets in pointer assignment statements; they may contain garbage or stale data that looks enough like a valid descriptor to cause a crash. Solve the problem by avoiding it -- ensure that pointers' descriptors are at least minimally established. Differential Revision: https://reviews.llvm.org/D149979
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! RUN: %flang_fc1 -fdebug-unparse-with-symbols %s 2>&1 | FileCheck %s | ||
! CHECK: end do | ||
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! RUN: %flang_fc1 -fdebug-unparse %s 2>&1 | FileCheck %s | ||
type :: hasPointer | ||
class(*), pointer :: sp | ||
end type | ||
type(hasPointer) hp | ||
!CHECK: hp=haspointer(sp=NULL()) | ||
hp = hasPointer() | ||
end | ||
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!RUN: bbc --dump-symbols %s | FileCheck %s | ||
!RUN: %flang_fc1 -fdebug-dump-symbols %s | FileCheck %s | ||
!Ensure that type with pointer component(s) has "noinitializationneeded=0" | ||
module m | ||
type hasPointer | ||
class(*), pointer :: sp, ap(:) | ||
end type | ||
end module | ||
!CHECK: .dt.haspointer, SAVE, TARGET (CompilerCreated, ReadOnly): ObjectEntity type: TYPE(derivedtype) init:derivedtype(binding=NULL(),name=.n.haspointer,sizeinbytes=104_8,uninstantiated=NULL(),kindparameter=NULL(),lenparameterkind=NULL(),component=.c.haspointer,procptr=NULL(),special=NULL(),specialbitset=0_4,hasparent=0_1,noinitializationneeded=0_1,nodestructionneeded=1_1,nofinalizationneeded=1_1) |