[flang-commits] [flang] [flang] Skip over fixed form spaces when prescanning exponents & kind… (PR #145347)
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Mon Jun 23 08:57:06 PDT 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-flang-parser
Author: Peter Klausler (klausler)
<details>
<summary>Changes</summary>
… suffixes
When performing conditional tokenization of exponents and numeric kind suffixes, be sure to skip over spaces in fixed form source.
Fixes https://github.com/llvm/llvm-project/issues/145333.
---
Full diff: https://github.com/llvm/llvm-project/pull/145347.diff
2 Files Affected:
- (modified) flang/lib/Parser/prescan.cpp (+18)
- (modified) flang/test/Preprocessing/bug518.F (+1-1)
``````````diff
diff --git a/flang/lib/Parser/prescan.cpp b/flang/lib/Parser/prescan.cpp
index 9aef0c9981e3c..ed5184b0aa13d 100644
--- a/flang/lib/Parser/prescan.cpp
+++ b/flang/lib/Parser/prescan.cpp
@@ -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
@@ -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();
diff --git a/flang/test/Preprocessing/bug518.F b/flang/test/Preprocessing/bug518.F
index 0b680dd5751b9..beb33564e4232 100644
--- a/flang/test/Preprocessing/bug518.F
+++ b/flang/test/Preprocessing/bug518.F
@@ -1,5 +1,5 @@
! RUN: %flang_fc1 -fdebug-unparse %s 2>&1 | FileCheck %s
! CHECK: k=1_4
k= 1_99999999
- &4
+ & 4
end
``````````
</details>
https://github.com/llvm/llvm-project/pull/145347
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