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[flang][preprocessor] Extend handling of line continuation replacements #107010

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merged 1 commit into from
Sep 4, 2024
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[flang][preprocessor] Extend handling of line continuation replacements #107010

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12 changes: 8 additions & 4 deletions flang/lib/Parser/prescan.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -712,12 +712,16 @@ bool Prescanner::NextToken(TokenSequence &tokens) {
// Subtlety: When an identifier is split across three or more continuation
// lines (or two continuation lines, immediately preceded or followed
// by '&' free form continuation line markers, its parts are kept as
// distinct pp-tokens so that macro operates on them independently.
// This trick accommodates the historic practice of using line
// continuation for token pasting after replacement.
// distinct pp-tokens so that macro replacement operates on them
// independently. This trick accommodates the historic practice of
// using line continuation for token pasting after replacement.
} else if (parts == 2) {
if (afterLast && afterLast < limit_) {
afterLast = SkipWhiteSpace(afterLast);
}
if ((start > start_ && start[-1] == '&') ||
(afterLast < limit_ && (*afterLast == '&' || *afterLast == '\n'))) {
(afterLast && afterLast < limit_ &&
(*afterLast == '&' || *afterLast == '\n'))) {
// call & call foo& call foo&
// &MACRO& OR &MACRO& OR &MACRO
// &foo(...) &(...)
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12 changes: 8 additions & 4 deletions flang/test/Preprocessing/pp134.F90
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Original file line number Diff line number Diff line change
@@ -1,7 +1,8 @@
! RUN: %flang -E %s 2>&1 | FileCheck %s
! CHECK: print *, ADC, 1
! CHECK: print *, AD, 1
! CHECK: print *, DC, 1
! CHECK: print *, AD, 2
! CHECK: print *, DC, 3
! CHECK: print *, AD(1), 4
! CHECK: print *, AD
! CHECK: print *, AB
#define B D
Expand All @@ -12,10 +13,13 @@
&C, 1
print *, A&
&B&
&, 1
&, 2
print *, &
&B&
&C, 1
&C, 3
print *, A&
&B &
&(1), 4
print *, A&
&B
print *, A&
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