1 //===-- WebAssemblyDebugValueManager.cpp - WebAssembly DebugValue Manager -===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 ///
9 /// \file
10 /// This file implements the manager for MachineInstr DebugValues.
11 ///
12 //===----------------------------------------------------------------------===//
13 
14 #include "WebAssemblyDebugValueManager.h"
15 #include "WebAssembly.h"
16 #include "WebAssemblyMachineFunctionInfo.h"
17 #include "llvm/CodeGen/MachineInstr.h"
18 
19 using namespace llvm;
20 
WebAssemblyDebugValueManager(MachineInstr * Instr)21 WebAssemblyDebugValueManager::WebAssemblyDebugValueManager(
22     MachineInstr *Instr) {
23   // This code differs from MachineInstr::collectDebugValues in that it scans
24   // the whole BB, not just contiguous DBG_VALUEs.
25   if (!Instr->getOperand(0).isReg())
26     return;
27 
28   MachineBasicBlock::iterator DI = *Instr;
29   ++DI;
30   for (MachineBasicBlock::iterator DE = Instr->getParent()->end(); DI != DE;
31        ++DI) {
32     if (DI->isDebugValue() &&
33         DI->getDebugOperandForReg(Instr->getOperand(0).getReg()))
34       DbgValues.push_back(&*DI);
35   }
36 }
37 
move(MachineInstr * Insert)38 void WebAssemblyDebugValueManager::move(MachineInstr *Insert) {
39   MachineBasicBlock *MBB = Insert->getParent();
40   for (MachineInstr *DBI : reverse(DbgValues))
41     MBB->splice(Insert, DBI->getParent(), DBI);
42 }
43 
updateReg(unsigned Reg)44 void WebAssemblyDebugValueManager::updateReg(unsigned Reg) {
45   for (auto *DBI : DbgValues)
46     DBI->getDebugOperand(0).setReg(Reg);
47 }
48 
clone(MachineInstr * Insert,unsigned NewReg)49 void WebAssemblyDebugValueManager::clone(MachineInstr *Insert,
50                                          unsigned NewReg) {
51   MachineBasicBlock *MBB = Insert->getParent();
52   MachineFunction *MF = MBB->getParent();
53   for (MachineInstr *DBI : reverse(DbgValues)) {
54     MachineInstr *Clone = MF->CloneMachineInstr(DBI);
55     Clone->getDebugOperand(0).setReg(NewReg);
56     MBB->insert(Insert, Clone);
57   }
58 }
59 
replaceWithLocal(unsigned LocalId)60 void WebAssemblyDebugValueManager::replaceWithLocal(unsigned LocalId) {
61   for (auto *DBI : DbgValues) {
62     MachineOperand &Op = DBI->getDebugOperand(0);
63     Op.ChangeToTargetIndex(llvm::WebAssembly::TI_LOCAL, LocalId);
64   }
65 }
66