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comparison llvm/lib/IR/SymbolTableListTraitsImpl.h @ 150:1d019706d866

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LLVM10
author anatofuz
date Thu, 13 Feb 2020 15:10:13 +0900
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children 0572611fdcc8
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147:c2174574ed3a 150:1d019706d866
1 //===-- llvm/SymbolTableListTraitsImpl.h - Implementation ------*- C++ -*--===//
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 // This file implements the stickier parts of the SymbolTableListTraits class,
10 // and is explicitly instantiated where needed to avoid defining all this code
11 // in a widely used header.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #ifndef LLVM_LIB_IR_SYMBOLTABLELISTTRAITSIMPL_H
16 #define LLVM_LIB_IR_SYMBOLTABLELISTTRAITSIMPL_H
17
18 #include "llvm/IR/SymbolTableListTraits.h"
19 #include "llvm/IR/ValueSymbolTable.h"
20
21 namespace llvm {
22
23 /// setSymTabObject - This is called when (f.e.) the parent of a basic block
24 /// changes. This requires us to remove all the instruction symtab entries from
25 /// the current function and reinsert them into the new function.
26 template <typename ValueSubClass>
27 template <typename TPtr>
28 void SymbolTableListTraits<ValueSubClass>::setSymTabObject(TPtr *Dest,
29 TPtr Src) {
30 // Get the old symtab and value list before doing the assignment.
31 ValueSymbolTable *OldST = getSymTab(getListOwner());
32
33 // Do it.
34 *Dest = Src;
35
36 // Get the new SymTab object.
37 ValueSymbolTable *NewST = getSymTab(getListOwner());
38
39 // If there is nothing to do, quick exit.
40 if (OldST == NewST) return;
41
42 // Move all the elements from the old symtab to the new one.
43 ListTy &ItemList = getList(getListOwner());
44 if (ItemList.empty()) return;
45
46 if (OldST) {
47 // Remove all entries from the previous symtab.
48 for (auto I = ItemList.begin(); I != ItemList.end(); ++I)
49 if (I->hasName())
50 OldST->removeValueName(I->getValueName());
51 }
52
53 if (NewST) {
54 // Add all of the items to the new symtab.
55 for (auto I = ItemList.begin(); I != ItemList.end(); ++I)
56 if (I->hasName())
57 NewST->reinsertValue(&*I);
58 }
59
60 }
61
62 template <typename ValueSubClass>
63 void SymbolTableListTraits<ValueSubClass>::addNodeToList(ValueSubClass *V) {
64 assert(!V->getParent() && "Value already in a container!!");
65 ItemParentClass *Owner = getListOwner();
66 V->setParent(Owner);
67 if (V->hasName())
68 if (ValueSymbolTable *ST = getSymTab(Owner))
69 ST->reinsertValue(V);
70 }
71
72 template <typename ValueSubClass>
73 void SymbolTableListTraits<ValueSubClass>::removeNodeFromList(
74 ValueSubClass *V) {
75 V->setParent(nullptr);
76 if (V->hasName())
77 if (ValueSymbolTable *ST = getSymTab(getListOwner()))
78 ST->removeValueName(V->getValueName());
79 }
80
81 template <typename ValueSubClass>
82 void SymbolTableListTraits<ValueSubClass>::transferNodesFromList(
83 SymbolTableListTraits &L2, iterator first, iterator last) {
84 // We only have to do work here if transferring instructions between BBs
85 ItemParentClass *NewIP = getListOwner(), *OldIP = L2.getListOwner();
86 if (NewIP == OldIP)
87 return;
88
89 // We only have to update symbol table entries if we are transferring the
90 // instructions to a different symtab object...
91 ValueSymbolTable *NewST = getSymTab(NewIP);
92 ValueSymbolTable *OldST = getSymTab(OldIP);
93 if (NewST != OldST) {
94 for (; first != last; ++first) {
95 ValueSubClass &V = *first;
96 bool HasName = V.hasName();
97 if (OldST && HasName)
98 OldST->removeValueName(V.getValueName());
99 V.setParent(NewIP);
100 if (NewST && HasName)
101 NewST->reinsertValue(&V);
102 }
103 } else {
104 // Just transferring between blocks in the same function, simply update the
105 // parent fields in the instructions...
106 for (; first != last; ++first)
107 first->setParent(NewIP);
108 }
109 }
110
111 } // End llvm namespace
112
113 #endif