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[flang][OpenMP] Prescanning bug with !$ fixed form line continuation #135416

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Merged
klausler merged 1 commit into from
Apr 14, 2025
Merged

[flang][OpenMP] Prescanning bug with !$ fixed form line continuation #135416

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22 changes: 10 additions & 12 deletions flang/lib/Parser/prescan.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1309,22 +1309,22 @@ const char *Prescanner::FixedFormContinuationLine(bool mightNeedSpace) {
tabInCurrentLine_ = false;
char col1{*nextLine_};
if (InCompilerDirective()) {
if (directiveSentinel_[0] == '$' && directiveSentinel_[1] == '\0') {
if (!IsFixedFormCommentChar(col1)) {
return nullptr;
} else if (directiveSentinel_[0] == '$' && directiveSentinel_[1] == '\0') {
// !$ OpenMP conditional compilation
if (preprocessingOnly_) {
// in -E mode, don't treat "!$ &" as a continuation
return nullptr;
} else if (IsFixedFormCommentChar(col1)) {
if (nextLine_[1] == '$') {
// accept but do not require a matching sentinel
if (!(nextLine_[2] == '&' || IsSpaceOrTab(&nextLine_[2]))) {
return nullptr;
}
} else {
return nullptr; // distinct directive
} else if (nextLine_[1] == '$') {
// accept but do not require a matching sentinel
if (!(nextLine_[2] == '&' || IsSpaceOrTab(&nextLine_[2]))) {
return nullptr;
}
} else {
return nullptr; // distinct directive
}
} else if (IsFixedFormCommentChar(col1)) {
} else { // all other directives
int j{1};
for (; j < 5; ++j) {
char ch{directiveSentinel_[j - 1]};
Expand All @@ -1339,8 +1339,6 @@ const char *Prescanner::FixedFormContinuationLine(bool mightNeedSpace) {
return nullptr;
}
}
} else {
return nullptr;
}
const char *col6{nextLine_ + 5};
if (*col6 != '\n' && *col6 != '0' && !IsSpaceOrTab(col6)) {
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24 changes: 24 additions & 0 deletions flang/test/Parser/OpenMP/bug518.f
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Original file line number Diff line number Diff line change
@@ -0,0 +1,24 @@
! RUN: %flang_fc1 -E %s 2>&1 | FileCheck %s --strict-whitespace --check-prefix=CHECK-E
! RUN: %flang_fc1 -fopenmp -fdebug-unparse %s 2>&1 | FileCheck %s --check-prefix=CHECK-OMP
! RUN: %flang_fc1 -fdebug-unparse %s 2>&1 | FileCheck %s --check-prefix=CHECK-NO-OMP

!$ thread = OMP_GET_MAX_THREADS()

!$omp parallel private(ia)
!$ continue
!$omp end parallel
end

!CHECK-E:{{^}}!$ thread = OMP_GET_MAX_THREADS()
!CHECK-E:{{^}}!$omp parallel private(ia)
!CHECK-E:{{^}}!$ continue
!CHECK-E:{{^}}!$omp end parallel

!CHECK-OMP:thread=omp_get_max_threads()
!CHECK-OMP:!$OMP PARALLEL PRIVATE(ia)
!CHECK-OMP: CONTINUE
!CHECK-OMP:!$OMP END PARALLEL

!CHECK-NO-OMP-NOT:thread=
!CHECK-NO-OMP-NOT:!$OMP
!CHECK-NO-OMP:END PROGRAM