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[flang][OpenMP] Detect BLOCK construct through lookahead #150617

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merged 1 commit into from
Jul 25, 2025
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[flang][OpenMP] Detect BLOCK construct through lookahead #150617

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17 changes: 12 additions & 5 deletions flang/lib/Parser/openmp-parsers.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1222,11 +1222,14 @@ struct StrictlyStructuredBlockParser {
using resultType = Block;

std::optional<resultType> Parse(ParseState &state) const {
if (auto epc{Parser<ExecutionPartConstruct>{}.Parse(state)}) {
if (IsFortranBlockConstruct(*epc)) {
Block block;
block.emplace_back(std::move(*epc));
return std::move(block);
// Detect BLOCK construct without parsing the entire thing.
if (lookAhead(skipStuffBeforeStatement >> "BLOCK"_tok).Parse(state)) {
if (auto epc{Parser<ExecutionPartConstruct>{}.Parse(state)}) {
if (IsFortranBlockConstruct(*epc)) {
Block block;
block.emplace_back(std::move(*epc));
return std::move(block);
}
}
}
return std::nullopt;
Expand All @@ -1237,6 +1240,10 @@ struct LooselyStructuredBlockParser {
using resultType = Block;

std::optional<resultType> Parse(ParseState &state) const {
// Detect BLOCK construct without parsing the entire thing.
if (lookAhead(skipStuffBeforeStatement >> "BLOCK"_tok).Parse(state)) {
return std::nullopt;
}
Block body;
if (auto epc{attempt(Parser<ExecutionPartConstruct>{}).Parse(state)}) {
if (!IsFortranBlockConstruct(*epc)) {
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