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[mlir][Transforms] More detailed error message when new IR cannot be legalized #152297

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Merged
merged 3 commits into from
Aug 7, 2025
Merged

[mlir][Transforms] More detailed error message when new IR cannot be legalized #152297

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[mlir][Transforms] More detailed error message when new IR cannot be …
matthias-springer Aug 6, 2025
6d03ac0
Update mlir/lib/Transforms/Utils/DialectConversion.cpp
matthias-springer Aug 7, 2025
73dfec2
reformat
matthias-springer Aug 7, 2025
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29 changes: 27 additions & 2 deletions mlir/lib/Transforms/Utils/DialectConversion.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2302,6 +2302,31 @@ OperationLegalizer::legalizeWithFold(Operation *op,
return success();
}

/// Report a fatal error indicating that newly produced or modified IR could
/// not be legalized.
static void
reportNewIrLegalizationFatalError(const Pattern &pattern,
const SetVector<Operation *> &newOps,
const SetVector<Operation *> &modifiedOps,
const SetVector<Block *> &insertedBlocks) {
auto newOpNames = llvm::map_range(
newOps, [](Operation *op) { return op->getName().getStringRef(); });
auto modifiedOpNames = llvm::map_range(
modifiedOps, [](Operation *op) { return op->getName().getStringRef(); });
StringRef detachedBlockStr = "(detached block)";
auto insertedBlockNames = llvm::map_range(insertedBlocks, [&](Block *block) {
if (block->getParentOp())
return block->getParentOp()->getName().getStringRef();
return detachedBlockStr;
});
llvm::report_fatal_error(
"pattern '" + pattern.getDebugName() +
"' produced IR that could not be legalized. " + "new ops: {" +
llvm::join(newOpNames, ", ") + "}, " + "modified ops: {" +
llvm::join(modifiedOpNames, ", ") + "}, " + "inserted block into ops: {" +
llvm::join(insertedBlockNames, ", ") + "}");
}

LogicalResult
OperationLegalizer::legalizeWithPattern(Operation *op,
ConversionPatternRewriter &rewriter) {
Expand Down Expand Up @@ -2389,8 +2414,8 @@ OperationLegalizer::legalizeWithPattern(Operation *op,
appliedPatterns.erase(&pattern);
if (failed(result)) {
if (!rewriterImpl.config.allowPatternRollback)
llvm::report_fatal_error("pattern '" + pattern.getDebugName() +
"' produced IR that could not be legalized");
reportNewIrLegalizationFatalError(pattern, newOps, modifiedOps,
insertedBlocks);
rewriterImpl.resetState(curState, pattern.getDebugName());
}
if (config.listener)
Expand Down