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//===-- CommandObjectTraceStartIntelPT.cpp --------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "CommandObjectTraceStartIntelPT.h"
#include "TraceIntelPT.h"
#include "TraceIntelPTConstants.h"
#include "lldb/Host/OptionParser.h"
#include "lldb/Interpreter/CommandOptionArgumentTable.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Trace.h"
#include <optional>
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::trace_intel_pt;
using namespace llvm;
// CommandObjectThreadTraceStartIntelPT
#define LLDB_OPTIONS_thread_trace_start_intel_pt
#include "TraceIntelPTCommandOptions.inc"
Status CommandObjectThreadTraceStartIntelPT::CommandOptions::SetOptionValue(
uint32_t option_idx, llvm::StringRef option_arg,
ExecutionContext *execution_context) {
Status error;
const int short_option = m_getopt_table[option_idx].val;
switch (short_option) {
case 's': {
if (std::optional<uint64_t> bytes =
ParsingUtils::ParseUserFriendlySizeExpression(option_arg))
m_ipt_trace_size = *bytes;
else
error.SetErrorStringWithFormat("invalid bytes expression for '%s'",
option_arg.str().c_str());
break;
}
case 't': {
m_enable_tsc = true;
break;
}
case 'p': {
int64_t psb_period;
if (option_arg.empty() || option_arg.getAsInteger(0, psb_period) ||
psb_period < 0)
error.SetErrorStringWithFormat("invalid integer value for option '%s'",
option_arg.str().c_str());
else
m_psb_period = psb_period;
break;
}
default:
llvm_unreachable("Unimplemented option");
}
return error;
}
void CommandObjectThreadTraceStartIntelPT::CommandOptions::
OptionParsingStarting(ExecutionContext *execution_context) {
m_ipt_trace_size = kDefaultIptTraceSize;
m_enable_tsc = kDefaultEnableTscValue;
m_psb_period = kDefaultPsbPeriod;
}
llvm::ArrayRef<OptionDefinition>
CommandObjectThreadTraceStartIntelPT::CommandOptions::GetDefinitions() {
return llvm::ArrayRef(g_thread_trace_start_intel_pt_options);
}
bool CommandObjectThreadTraceStartIntelPT::DoExecuteOnThreads(
Args &command, CommandReturnObject &result,
llvm::ArrayRef<lldb::tid_t> tids) {
if (Error err = m_trace.Start(tids, m_options.m_ipt_trace_size,
m_options.m_enable_tsc, m_options.m_psb_period))
result.SetError(Status(std::move(err)));
else
result.SetStatus(eReturnStatusSuccessFinishResult);
return result.Succeeded();
}
/// CommandObjectProcessTraceStartIntelPT
#define LLDB_OPTIONS_process_trace_start_intel_pt
#include "TraceIntelPTCommandOptions.inc"
Status CommandObjectProcessTraceStartIntelPT::CommandOptions::SetOptionValue(
uint32_t option_idx, llvm::StringRef option_arg,
ExecutionContext *execution_context) {
Status error;
const int short_option = m_getopt_table[option_idx].val;
switch (short_option) {
case 's': {
if (std::optional<uint64_t> bytes =
ParsingUtils::ParseUserFriendlySizeExpression(option_arg))
m_ipt_trace_size = *bytes;
else
error.SetErrorStringWithFormat("invalid bytes expression for '%s'",
option_arg.str().c_str());
break;
}
case 'l': {
if (std::optional<uint64_t> bytes =
ParsingUtils::ParseUserFriendlySizeExpression(option_arg))
m_process_buffer_size_limit = *bytes;
else
error.SetErrorStringWithFormat("invalid bytes expression for '%s'",
option_arg.str().c_str());
break;
}
case 't': {
m_enable_tsc = true;
break;
}
case 'c': {
m_per_cpu_tracing = true;
break;
}
case 'd': {
m_disable_cgroup_filtering = true;
break;
}
case 'p': {
int64_t psb_period;
if (option_arg.empty() || option_arg.getAsInteger(0, psb_period) ||
psb_period < 0)
error.SetErrorStringWithFormat("invalid integer value for option '%s'",
option_arg.str().c_str());
else
m_psb_period = psb_period;
break;
}
default:
llvm_unreachable("Unimplemented option");
}
return error;
}
void CommandObjectProcessTraceStartIntelPT::CommandOptions::
OptionParsingStarting(ExecutionContext *execution_context) {
m_ipt_trace_size = kDefaultIptTraceSize;
m_process_buffer_size_limit = kDefaultProcessBufferSizeLimit;
m_enable_tsc = kDefaultEnableTscValue;
m_psb_period = kDefaultPsbPeriod;
m_per_cpu_tracing = kDefaultPerCpuTracing;
m_disable_cgroup_filtering = kDefaultDisableCgroupFiltering;
}
llvm::ArrayRef<OptionDefinition>
CommandObjectProcessTraceStartIntelPT::CommandOptions::GetDefinitions() {
return llvm::ArrayRef(g_process_trace_start_intel_pt_options);
}
bool CommandObjectProcessTraceStartIntelPT::DoExecute(
Args &command, CommandReturnObject &result) {
if (Error err = m_trace.Start(
m_options.m_ipt_trace_size, m_options.m_process_buffer_size_limit,
m_options.m_enable_tsc, m_options.m_psb_period,
m_options.m_per_cpu_tracing, m_options.m_disable_cgroup_filtering))
result.SetError(Status(std::move(err)));
else
result.SetStatus(eReturnStatusSuccessFinishResult);
return result.Succeeded();
}
std::optional<uint64_t>
ParsingUtils::ParseUserFriendlySizeExpression(llvm::StringRef size_expression) {
if (size_expression.empty()) {
return std::nullopt;
}
const uint64_t kBytesMultiplier = 1;
const uint64_t kKibiBytesMultiplier = 1024;
const uint64_t kMebiBytesMultiplier = 1024 * 1024;
DenseMap<StringRef, uint64_t> multipliers = {
{"mib", kMebiBytesMultiplier}, {"mb", kMebiBytesMultiplier},
{"m", kMebiBytesMultiplier}, {"kib", kKibiBytesMultiplier},
{"kb", kKibiBytesMultiplier}, {"k", kKibiBytesMultiplier},
{"b", kBytesMultiplier}, {"", kBytesMultiplier}};
const auto non_digit_index = size_expression.find_first_not_of("0123456789");
if (non_digit_index == 0) { // expression starts from from non-digit char.
return std::nullopt;
}
const llvm::StringRef number_part =
non_digit_index == llvm::StringRef::npos
? size_expression
: size_expression.substr(0, non_digit_index);
uint64_t parsed_number;
if (number_part.getAsInteger(10, parsed_number)) {
return std::nullopt;
}
if (non_digit_index != llvm::StringRef::npos) { // if expression has units.
const auto multiplier = size_expression.substr(non_digit_index).lower();
auto it = multipliers.find(multiplier);
if (it == multipliers.end())
return std::nullopt;
return parsed_number * it->second;
} else {
return parsed_number;
}
}
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