1//===-- WatchpointResource.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#include <assert.h>
10
11#include "lldb/Breakpoint/WatchpointResource.h"
12#include "lldb/Utility/Stream.h"
13
14#include <algorithm>
15
16using namespace lldb;
17using namespace lldb_private;
18
19WatchpointResource::WatchpointResource(lldb::addr_t addr, size_t size,
20 bool read, bool write)
21 : m_id(GetNextID()), m_addr(addr), m_size(size),
22 m_watch_read(read), m_watch_write(write) {}
23
24WatchpointResource::~WatchpointResource() {
25 std::lock_guard<std::mutex> guard(m_constituents_mutex);
26 m_constituents.clear();
27}
28
29addr_t WatchpointResource::GetLoadAddress() const { return m_addr; }
30
31size_t WatchpointResource::GetByteSize() const { return m_size; }
32
33bool WatchpointResource::WatchpointResourceRead() const { return m_watch_read; }
34
35bool WatchpointResource::WatchpointResourceWrite() const {
36 return m_watch_write;
37}
38
39void WatchpointResource::SetType(bool read, bool write) {
40 m_watch_read = read;
41 m_watch_write = write;
42}
43
44wp_resource_id_t WatchpointResource::GetID() const { return m_id; }
45
46bool WatchpointResource::Contains(addr_t addr) {
47 if (addr >= m_addr && addr < m_addr + m_size)
48 return true;
49 return false;
50}
51
52void WatchpointResource::AddConstituent(const WatchpointSP &wp_sp) {
53 std::lock_guard<std::mutex> guard(m_constituents_mutex);
54 m_constituents.push_back(x: wp_sp);
55}
56
57void WatchpointResource::RemoveConstituent(WatchpointSP &wp_sp) {
58 std::lock_guard<std::mutex> guard(m_constituents_mutex);
59 const auto &it =
60 std::find(first: m_constituents.begin(), last: m_constituents.end(), val: wp_sp);
61 if (it != m_constituents.end())
62 m_constituents.erase(position: it);
63}
64
65size_t WatchpointResource::GetNumberOfConstituents() {
66 std::lock_guard<std::mutex> guard(m_constituents_mutex);
67 return m_constituents.size();
68}
69
70bool WatchpointResource::ConstituentsContains(const WatchpointSP &wp_sp) {
71 return ConstituentsContains(wp: wp_sp.get());
72}
73
74bool WatchpointResource::ConstituentsContains(const Watchpoint *wp) {
75 std::lock_guard<std::mutex> guard(m_constituents_mutex);
76 WatchpointCollection::const_iterator match =
77 std::find_if(first: m_constituents.begin(), last: m_constituents.end(),
78 pred: [&wp](const WatchpointSP &x) { return x.get() == wp; });
79 return match != m_constituents.end();
80}
81
82WatchpointSP WatchpointResource::GetConstituentAtIndex(size_t idx) {
83 std::lock_guard<std::mutex> guard(m_constituents_mutex);
84 assert(idx < m_constituents.size());
85 if (idx >= m_constituents.size())
86 return {};
87
88 return m_constituents[idx];
89}
90
91WatchpointResource::WatchpointCollection
92WatchpointResource::CopyConstituentsList() {
93 std::lock_guard<std::mutex> guard(m_constituents_mutex);
94 return m_constituents;
95}
96
97bool WatchpointResource::ShouldStop(StoppointCallbackContext *context) {
98 // LWP_TODO: Need to poll all Watchpoint constituents and see if
99 // we should stop, like BreakpointSites do.
100#if 0
101 m_hit_counter.Increment();
102 // ShouldStop can do a lot of work, and might even come back and hit
103 // this breakpoint site again. So don't hold the m_constituents_mutex the
104 // whole while. Instead make a local copy of the collection and call
105 // ShouldStop on the copy.
106 WatchpointResourceCollection constituents_copy;
107 {
108 std::lock_guard<std::recursive_mutex> guard(m_constituents_mutex);
109 constituents_copy = m_constituents;
110 }
111 return constituents_copy.ShouldStop(context);
112#endif
113 return true;
114}
115
116void WatchpointResource::Dump(Stream *s) const {
117 s->Printf(format: "addr = 0x%8.8" PRIx64 " size = %zu", m_addr, m_size);
118}
119
120wp_resource_id_t WatchpointResource::GetNextID() {
121 static wp_resource_id_t g_next_id = 0;
122 return ++g_next_id;
123}
124

source code of lldb/source/Breakpoint/WatchpointResource.cpp