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[flang] Skip over fixed form spaces when prescanning exponents & kind… #145347

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Merged
merged 1 commit into from
Jun 30, 2025
Merged

[flang] Skip over fixed form spaces when prescanning exponents & kind… #145347

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18 changes: 18 additions & 0 deletions flang/lib/Parser/prescan.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -915,12 +915,21 @@ bool Prescanner::HandleExponent(TokenSequence &tokens) {
int startColumn{column_};
TokenSequence possible;
EmitCharAndAdvance(possible, *at_);
if (InFixedFormSource()) {
SkipSpaces();
}
if (*at_ == '+' || *at_ == '-') {
EmitCharAndAdvance(possible, *at_);
if (InFixedFormSource()) {
SkipSpaces();
}
}
if (IsDecimalDigit(*at_)) { // it's an exponent; scan it
while (IsDecimalDigit(*at_)) {
EmitCharAndAdvance(possible, *at_);
if (InFixedFormSource()) {
SkipSpaces();
}
}
possible.CloseToken();
tokens.AppendRange(possible, 0); // appends to current token
Expand All @@ -940,13 +949,22 @@ bool Prescanner::HandleKindSuffix(TokenSequence &tokens) {
TokenSequence withUnderscore, separate;
EmitChar(withUnderscore, '_');
EmitCharAndAdvance(separate, '_');
if (InFixedFormSource()) {
SkipSpaces();
}
if (IsLegalInIdentifier(*at_)) {
separate.CloseToken();
EmitChar(withUnderscore, *at_);
EmitCharAndAdvance(separate, *at_);
if (InFixedFormSource()) {
SkipSpaces();
}
while (IsLegalInIdentifier(*at_)) {
EmitChar(withUnderscore, *at_);
EmitCharAndAdvance(separate, *at_);
if (InFixedFormSource()) {
SkipSpaces();
}
}
}
withUnderscore.CloseToken();
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2 changes: 1 addition & 1 deletion flang/test/Preprocessing/bug518.F
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
! RUN: %flang_fc1 -fdebug-unparse %s 2>&1 | FileCheck %s
! CHECK: k=1_4
k= 1_99999999
&4
& 4
end
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