ae6f788240
This patch imports the instruction-referencing implementation of LiveDebugValues proposed here: http://lists.llvm.org/pipermail/llvm-dev/2020-June/142368.html The new implementation is unreachable in this patch, it's the next patch that enables it behind a command line switch. Briefly, rather than tracking variable locations by just their location as the 'VarLoc' implementation does, this implementation does it by value: * Each value defined in a function is numbered, and propagated through dataflow, * Each DBG_VALUE reads a machine value number from a machine location, * Variable _values_ are propagated through dataflow, * Variable values are translated back into locations, DBG_VALUEs inserted to specify where those locations are. The ultimate aim of this is to enable referring to variable values throughout post-isel code, rather than locations. Those patches will build on top of this new LiveDebugValues implementation in later patches -- it can't be done with the VarLoc implementation as we don't have value information, only locations. Differential Revision: https://reviews.llvm.org/D83047
33 lines
1.1 KiB
C++
33 lines
1.1 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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#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) = 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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