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authorDimitry Andric <dim@FreeBSD.org>2021-08-22 19:00:43 +0000
committerDimitry Andric <dim@FreeBSD.org>2021-11-13 20:39:49 +0000
commitfe6060f10f634930ff71b7c50291ddc610da2475 (patch)
tree1483580c790bd4d27b6500a7542b5ee00534d3cc /contrib/llvm-project/llvm/lib/Target/WebAssembly/WebAssemblyNullifyDebugValueLists.cpp
parentb61bce17f346d79cecfd8f195a64b10f77be43b1 (diff)
parent344a3780b2e33f6ca763666c380202b18aab72a3 (diff)
Diffstat (limited to 'contrib/llvm-project/llvm/lib/Target/WebAssembly/WebAssemblyNullifyDebugValueLists.cpp')
-rw-r--r--contrib/llvm-project/llvm/lib/Target/WebAssembly/WebAssemblyNullifyDebugValueLists.cpp68
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();
+}