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
16 using namespace lldb;
17 using namespace lldb_private;
18
WatchpointResource(lldb::addr_t addr,size_t size,bool read,bool write)19 WatchpointResource::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
~WatchpointResource()24 WatchpointResource::~WatchpointResource() {
25 std::lock_guard<std::mutex> guard(m_constituents_mutex);
26 m_constituents.clear();
27 }
28
GetLoadAddress() const29 addr_t WatchpointResource::GetLoadAddress() const { return m_addr; }
30
GetByteSize() const31 size_t WatchpointResource::GetByteSize() const { return m_size; }
32
WatchpointResourceRead() const33 bool WatchpointResource::WatchpointResourceRead() const { return m_watch_read; }
34
WatchpointResourceWrite() const35 bool WatchpointResource::WatchpointResourceWrite() const {
36 return m_watch_write;
37 }
38
SetType(bool read,bool write)39 void WatchpointResource::SetType(bool read, bool write) {
40 m_watch_read = read;
41 m_watch_write = write;
42 }
43
GetID() const44 wp_resource_id_t WatchpointResource::GetID() const { return m_id; }
45
Contains(addr_t addr)46 bool WatchpointResource::Contains(addr_t addr) {
47 if (addr >= m_addr && addr < m_addr + m_size)
48 return true;
49 return false;
50 }
51
AddConstituent(const WatchpointSP & wp_sp)52 void WatchpointResource::AddConstituent(const WatchpointSP &wp_sp) {
53 std::lock_guard<std::mutex> guard(m_constituents_mutex);
54 m_constituents.push_back(wp_sp);
55 }
56
RemoveConstituent(WatchpointSP & wp_sp)57 void WatchpointResource::RemoveConstituent(WatchpointSP &wp_sp) {
58 std::lock_guard<std::mutex> guard(m_constituents_mutex);
59 const auto &it =
60 std::find(m_constituents.begin(), m_constituents.end(), wp_sp);
61 if (it != m_constituents.end())
62 m_constituents.erase(it);
63 }
64
GetNumberOfConstituents()65 size_t WatchpointResource::GetNumberOfConstituents() {
66 std::lock_guard<std::mutex> guard(m_constituents_mutex);
67 return m_constituents.size();
68 }
69
ConstituentsContains(const WatchpointSP & wp_sp)70 bool WatchpointResource::ConstituentsContains(const WatchpointSP &wp_sp) {
71 return ConstituentsContains(wp_sp.get());
72 }
73
ConstituentsContains(const Watchpoint * wp)74 bool WatchpointResource::ConstituentsContains(const Watchpoint *wp) {
75 std::lock_guard<std::mutex> guard(m_constituents_mutex);
76 WatchpointCollection::const_iterator match =
77 std::find_if(m_constituents.begin(), m_constituents.end(),
78 [&wp](const WatchpointSP &x) { return x.get() == wp; });
79 return match != m_constituents.end();
80 }
81
GetConstituentAtIndex(size_t idx)82 WatchpointSP 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
91 WatchpointResource::WatchpointCollection
CopyConstituentsList()92 WatchpointResource::CopyConstituentsList() {
93 std::lock_guard<std::mutex> guard(m_constituents_mutex);
94 return m_constituents;
95 }
96
ShouldStop(StoppointCallbackContext * context)97 bool 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
Dump(Stream * s) const116 void WatchpointResource::Dump(Stream *s) const {
117 s->Printf("addr = 0x%8.8" PRIx64 " size = %zu", m_addr, m_size);
118 }
119
GetNextID()120 wp_resource_id_t WatchpointResource::GetNextID() {
121 static wp_resource_id_t g_next_id = 0;
122 return ++g_next_id;
123 }
124