1 //===-- FormatCache.cpp ---------------------------------------------------===//
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 
10 
11 
12 #include "lldb/DataFormatters/FormatCache.h"
13 
14 using namespace lldb;
15 using namespace lldb_private;
16 
17 FormatCache::Entry::Entry()
18     : m_format_cached(false), m_summary_cached(false),
19       m_synthetic_cached(false) {}
20 
21 bool FormatCache::Entry::IsFormatCached() { return m_format_cached; }
22 
23 bool FormatCache::Entry::IsSummaryCached() { return m_summary_cached; }
24 
25 bool FormatCache::Entry::IsSyntheticCached() { return m_synthetic_cached; }
26 
27 void FormatCache::Entry::Get(lldb::TypeFormatImplSP &retval) {
28   retval = m_format_sp;
29 }
30 
31 void FormatCache::Entry::Get(lldb::TypeSummaryImplSP &retval) {
32   retval = m_summary_sp;
33 }
34 
35 void FormatCache::Entry::Get(lldb::SyntheticChildrenSP &retval) {
36   retval = m_synthetic_sp;
37 }
38 
39 void FormatCache::Entry::Set(lldb::TypeFormatImplSP format_sp) {
40   m_format_cached = true;
41   m_format_sp = format_sp;
42 }
43 
44 void FormatCache::Entry::Set(lldb::TypeSummaryImplSP summary_sp) {
45   m_summary_cached = true;
46   m_summary_sp = summary_sp;
47 }
48 
49 void FormatCache::Entry::Set(lldb::SyntheticChildrenSP synthetic_sp) {
50   m_synthetic_cached = true;
51   m_synthetic_sp = synthetic_sp;
52 }
53 
54 FormatCache::Entry &FormatCache::GetEntry(ConstString type) {
55   auto i = m_map.find(type), e = m_map.end();
56   if (i != e)
57     return i->second;
58   m_map[type] = FormatCache::Entry();
59   return m_map[type];
60 }
61 
62 namespace lldb_private {
63 
64 template<> bool FormatCache::Entry::IsCached<lldb::TypeFormatImplSP>() {
65   return IsFormatCached();
66 }
67 template<> bool FormatCache::Entry::IsCached<lldb::TypeSummaryImplSP> () {
68   return IsSummaryCached();
69 }
70 template<> bool FormatCache::Entry::IsCached<lldb::SyntheticChildrenSP>() {
71   return IsSyntheticCached();
72 }
73 
74 } // namespace lldb_private
75 
76 template <typename ImplSP>
77 bool FormatCache::Get(ConstString type, ImplSP &format_impl_sp) {
78   std::lock_guard<std::recursive_mutex> guard(m_mutex);
79   auto entry = GetEntry(type);
80   if (entry.IsCached<ImplSP>()) {
81     m_cache_hits++;
82     entry.Get(format_impl_sp);
83     return true;
84   }
85   m_cache_misses++;
86   format_impl_sp.reset();
87   return false;
88 }
89 
90 /// Explicit instantiations for the three types.
91 /// \{
92 template bool
93 FormatCache::Get<lldb::TypeFormatImplSP>(ConstString, lldb::TypeFormatImplSP &);
94 template bool
95 FormatCache::Get<lldb::TypeSummaryImplSP>(ConstString,
96                                           lldb::TypeSummaryImplSP &);
97 template bool
98 FormatCache::Get<lldb::SyntheticChildrenSP>(ConstString,
99                                             lldb::SyntheticChildrenSP &);
100 /// \}
101 
102 void FormatCache::Set(ConstString type, lldb::TypeFormatImplSP &format_sp) {
103   std::lock_guard<std::recursive_mutex> guard(m_mutex);
104   GetEntry(type).Set(format_sp);
105 }
106 
107 void FormatCache::Set(ConstString type, lldb::TypeSummaryImplSP &summary_sp) {
108   std::lock_guard<std::recursive_mutex> guard(m_mutex);
109   GetEntry(type).Set(summary_sp);
110 }
111 
112 void FormatCache::Set(ConstString type,
113                       lldb::SyntheticChildrenSP &synthetic_sp) {
114   std::lock_guard<std::recursive_mutex> guard(m_mutex);
115   GetEntry(type).Set(synthetic_sp);
116 }
117 
118 void FormatCache::Clear() {
119   std::lock_guard<std::recursive_mutex> guard(m_mutex);
120   m_map.clear();
121 }
122