708cbda577
This reapplies54a61c94f9, its follow up in547b712500, which were reverted95fe61e639. Original commit message: VarLoc based LiveDebugValues will abandon variable location propagation if there are too many blocks and variable assignments in the function. If it didn't, and we had (say) 1000 blocks and 1000 variables in scope, we'd end up with 1 million DBG_VALUEs just at the start of blocks. Instruction-referencing LiveDebugValues should honour this limitation too (because the same limitation applies to it). Hoist the relevant command line options into LiveDebugValues.cpp and pass it down into the implementation classes as an argument to ExtendRanges. I've duplicated all the run-lines in live-debug-values-cutoffs.mir to have an instruction-referencing flavour. Differential Revision: https://reviews.llvm.org/D107823
40 lines
1.4 KiB
C++
40 lines
1.4 KiB
C++
//===- LiveDebugValues.cpp - Tracking Debug Value MIs ---------*- C++ -*---===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_CODEGEN_LIVEDEBUGVALUES_LIVEDEBUGVALUES_H
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#define LLVM_LIB_CODEGEN_LIVEDEBUGVALUES_LIVEDEBUGVALUES_H
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/TargetPassConfig.h"
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namespace llvm {
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// Inline namespace for types / symbols shared between different
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// LiveDebugValues implementations.
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inline namespace SharedLiveDebugValues {
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// Expose a base class for LiveDebugValues interfaces to inherit from. This
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// allows the generic LiveDebugValues pass handles to call into the
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// implementation.
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class LDVImpl {
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public:
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virtual bool ExtendRanges(MachineFunction &MF, TargetPassConfig *TPC,
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unsigned InputBBLimit,
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unsigned InputDbgValLimit) = 0;
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virtual ~LDVImpl() {}
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};
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} // namespace SharedLiveDebugValues
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// Factory functions for LiveDebugValues implementations.
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extern LDVImpl *makeVarLocBasedLiveDebugValues();
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extern LDVImpl *makeInstrRefBasedLiveDebugValues();
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} // namespace llvm
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#endif // LLVM_LIB_CODEGEN_LIVEDEBUGVALUES_LIVEDEBUGVALUES_H
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