LLDB mainline
TraceIntelPTGDBRemotePackets.cpp
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1//===-- TraceIntelPTGDBRemotePackets.cpp ------------------------*- 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
10
11using namespace llvm;
12using namespace llvm::json;
13
14namespace lldb_private {
15
16const char *IntelPTDataKinds::kProcFsCpuInfo = "procfsCpuInfo";
17const char *IntelPTDataKinds::kIptTrace = "iptTrace";
19 "perfContextSwitchTrace";
20
22 return per_cpu_tracing.value_or(false);
23}
24
25json::Value toJSON(const JSONUINT64 &uint64, bool hex) {
26 if (hex)
27 return json::Value(formatv("{0:x+}", uint64.value));
28 else
29 return json::Value(formatv("{0}", uint64.value));
30}
31
32bool fromJSON(const json::Value &value, JSONUINT64 &uint64, Path path) {
33 if (std::optional<uint64_t> val = value.getAsUINT64()) {
34 uint64.value = *val;
35 return true;
36 } else if (std::optional<StringRef> val = value.getAsString()) {
37 if (!val->getAsInteger(/*radix=*/0, uint64.value))
38 return true;
39 path.report("invalid string number");
40 }
41 path.report("invalid number or string number");
42 return false;
43}
44
45bool fromJSON(const json::Value &value, TraceIntelPTStartRequest &packet,
46 Path path) {
47 ObjectMapper o(value, path);
48 if (!(o && fromJSON(value, (TraceStartRequest &)packet, path) &&
49 o.map("enableTsc", packet.enable_tsc) &&
50 o.map("psbPeriod", packet.psb_period) &&
51 o.map("iptTraceSize", packet.ipt_trace_size)))
52 return false;
53
54 if (packet.IsProcessTracing()) {
55 if (!o.map("processBufferSizeLimit", packet.process_buffer_size_limit) ||
56 !o.map("perCpuTracing", packet.per_cpu_tracing) ||
57 !o.map("disableCgroupTracing", packet.disable_cgroup_filtering))
58 return false;
59 }
60 return true;
61}
62
63json::Value toJSON(const TraceIntelPTStartRequest &packet) {
64 json::Value base = toJSON((const TraceStartRequest &)packet);
65 json::Object &obj = *base.getAsObject();
66 obj.try_emplace("iptTraceSize", packet.ipt_trace_size);
67 obj.try_emplace("processBufferSizeLimit", packet.process_buffer_size_limit);
68 obj.try_emplace("psbPeriod", packet.psb_period);
69 obj.try_emplace("enableTsc", packet.enable_tsc);
70 obj.try_emplace("perCpuTracing", packet.per_cpu_tracing);
71 obj.try_emplace("disableCgroupTracing", packet.disable_cgroup_filtering);
72 return base;
73}
74
75uint64_t LinuxPerfZeroTscConversion::ToNanos(uint64_t tsc) const {
76 uint64_t quot = tsc >> time_shift;
77 uint64_t rem_flag = (((uint64_t)1 << time_shift) - 1);
78 uint64_t rem = tsc & rem_flag;
79 return time_zero.value + quot * time_mult + ((rem * time_mult) >> time_shift);
80}
81
82uint64_t LinuxPerfZeroTscConversion::ToTSC(uint64_t nanos) const {
83 uint64_t time = nanos - time_zero.value;
84 uint64_t quot = time / time_mult;
85 uint64_t rem = time % time_mult;
86 return (quot << time_shift) + (rem << time_shift) / time_mult;
87}
88
89json::Value toJSON(const LinuxPerfZeroTscConversion &packet) {
90 return json::Value(json::Object{
91 {"timeMult", packet.time_mult},
92 {"timeShift", packet.time_shift},
93 {"timeZero", toJSON(packet.time_zero, /*hex=*/false)},
94 });
95}
96
97bool fromJSON(const json::Value &value, LinuxPerfZeroTscConversion &packet,
98 json::Path path) {
99 ObjectMapper o(value, path);
100 uint64_t time_mult, time_shift;
101 if (!(o && o.map("timeMult", time_mult) && o.map("timeShift", time_shift) &&
102 o.map("timeZero", packet.time_zero)))
103 return false;
104 packet.time_mult = time_mult;
105 packet.time_shift = time_shift;
106 return true;
107}
108
109bool fromJSON(const json::Value &value, TraceIntelPTGetStateResponse &packet,
110 json::Path path) {
111 ObjectMapper o(value, path);
112 return o && fromJSON(value, (TraceGetStateResponse &)packet, path) &&
113 o.map("tscPerfZeroConversion", packet.tsc_perf_zero_conversion) &&
114 o.map("usingCgroupFiltering", packet.using_cgroup_filtering);
115}
116
117json::Value toJSON(const TraceIntelPTGetStateResponse &packet) {
118 json::Value base = toJSON((const TraceGetStateResponse &)packet);
119 json::Object &obj = *base.getAsObject();
120 obj.insert({"tscPerfZeroConversion", packet.tsc_perf_zero_conversion});
121 obj.insert({"usingCgroupFiltering", packet.using_cgroup_filtering});
122 return base;
123}
124
125} // namespace lldb_private
A class that represents a running process on the host machine.
Definition: SBAttachInfo.h:14
bool fromJSON(const llvm::json::Value &value, TraceSupportedResponse &info, llvm::json::Path path)
llvm::json::Value toJSON(const TraceSupportedResponse &packet)
Definition: Debugger.h:54
Helper structure to help parse long numbers that can't be easily represented by a JSON number that is...
uint64_t ToNanos(uint64_t tsc) const
Convert TSC value to nanosecond wall time.
std::optional< LinuxPerfZeroTscConversion > tsc_perf_zero_conversion
The TSC to wall time conversion if it exists, otherwise nullptr.
std::optional< bool > disable_cgroup_filtering
Disable the cgroup filtering that is automatically applied in per cpu mode.
std::optional< bool > per_cpu_tracing
Whether to have a trace buffer per thread or per cpu cpu.
std::optional< uint64_t > psb_period
PSB packet period.
std::optional< uint64_t > process_buffer_size_limit
Required when doing "process tracing".
uint64_t ipt_trace_size
Size in bytes to use for each thread's trace buffer.
jLLDBTraceStart gdb-remote packet
bool IsProcessTracing() const
jLLDBTraceStart