diff options
author | Dimitry Andric <dim@FreeBSD.org> | 2021-08-22 19:00:43 +0000 |
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committer | Dimitry Andric <dim@FreeBSD.org> | 2021-11-13 20:39:49 +0000 |
commit | fe6060f10f634930ff71b7c50291ddc610da2475 (patch) | |
tree | 1483580c790bd4d27b6500a7542b5ee00534d3cc /contrib/llvm-project/llvm/lib/Target/WebAssembly/WebAssemblyNullifyDebugValueLists.cpp | |
parent | b61bce17f346d79cecfd8f195a64b10f77be43b1 (diff) | |
parent | 344a3780b2e33f6ca763666c380202b18aab72a3 (diff) |
Diffstat (limited to 'contrib/llvm-project/llvm/lib/Target/WebAssembly/WebAssemblyNullifyDebugValueLists.cpp')
-rw-r--r-- | contrib/llvm-project/llvm/lib/Target/WebAssembly/WebAssemblyNullifyDebugValueLists.cpp | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/contrib/llvm-project/llvm/lib/Target/WebAssembly/WebAssemblyNullifyDebugValueLists.cpp b/contrib/llvm-project/llvm/lib/Target/WebAssembly/WebAssemblyNullifyDebugValueLists.cpp new file mode 100644 index 000000000000..62fa089a94d4 --- /dev/null +++ b/contrib/llvm-project/llvm/lib/Target/WebAssembly/WebAssemblyNullifyDebugValueLists.cpp @@ -0,0 +1,68 @@ +//=== WebAssemblyNullifyDebugValueLists.cpp - Nullify DBG_VALUE_LISTs ---===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// +/// +/// \file +/// Nullify DBG_VALUE_LISTs instructions as a temporary measure before we +/// implement DBG_VALUE_LIST handling in WebAssemblyDebugValueManager. +/// See https://bugs.llvm.org/show_bug.cgi?id=50361. +/// TODO Correctly handle DBG_VALUE_LISTs +/// +//===----------------------------------------------------------------------===// + +#include "WebAssembly.h" +#include "WebAssemblySubtarget.h" +using namespace llvm; + +#define DEBUG_TYPE "wasm-nullify-dbg-value-lists" + +namespace { +class WebAssemblyNullifyDebugValueLists final : public MachineFunctionPass { + StringRef getPassName() const override { + return "WebAssembly Nullify DBG_VALUE_LISTs"; + } + + bool runOnMachineFunction(MachineFunction &MF) override; + +public: + static char ID; // Pass identification, replacement for typeid + WebAssemblyNullifyDebugValueLists() : MachineFunctionPass(ID) {} +}; +} // end anonymous namespace + +char WebAssemblyNullifyDebugValueLists::ID = 0; +INITIALIZE_PASS(WebAssemblyNullifyDebugValueLists, DEBUG_TYPE, + "WebAssembly Nullify DBG_VALUE_LISTs", false, false) + +FunctionPass *llvm::createWebAssemblyNullifyDebugValueLists() { + return new WebAssemblyNullifyDebugValueLists(); +} + +bool WebAssemblyNullifyDebugValueLists::runOnMachineFunction( + MachineFunction &MF) { + LLVM_DEBUG(dbgs() << "********** Nullify DBG_VALUE_LISTs **********\n" + "********** Function: " + << MF.getName() << '\n'); + const auto &TII = *MF.getSubtarget<WebAssemblySubtarget>().getInstrInfo(); + SmallVector<MachineInstr *, 2> DbgValueLists; + for (auto &MBB : MF) + for (auto &MI : MBB) + if (MI.getOpcode() == TargetOpcode::DBG_VALUE_LIST) + DbgValueLists.push_back(&MI); + + // Our backend, including WebAssemblyDebugValueManager, currently cannot + // handle DBG_VALUE_LISTs correctly. So this converts DBG_VALUE_LISTs to + // "DBG_VALUE $noreg", which will appear as "optimized out". + for (auto *DVL : DbgValueLists) { + BuildMI(*DVL->getParent(), DVL, DVL->getDebugLoc(), + TII.get(TargetOpcode::DBG_VALUE), false, Register(), + DVL->getOperand(0).getMetadata(), DVL->getOperand(1).getMetadata()); + DVL->eraseFromParent(); + } + + return !DbgValueLists.empty(); +} |