1 files changed, 114 insertions, 0 deletions
diff --git a/Source/cmMakefileProfilingData.cxx b/Source/cmMakefileProfilingData.cxx
new file mode 100644
index 000000000..29fd44051
--- /dev/null
+++ b/Source/cmMakefileProfilingData.cxx
@@ -0,0 +1,114 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#include "cmMakefileProfilingData.h"
+
+#include <chrono>
+#include <stdexcept>
+#include <vector>
+
+#include <cm3p/json/value.h>
+#include <cm3p/json/writer.h>
+
+#include "cmsys/FStream.hxx"
+#include "cmsys/SystemInformation.hxx"
+
+#include "cmListFileCache.h"
+#include "cmStringAlgorithms.h"
+#include "cmSystemTools.h"
+
+cmMakefileProfilingData::cmMakefileProfilingData(
+  const std::string& profileStream)
+{
+  std::ios::openmode omode = std::ios::out | std::ios::trunc;
+  this->ProfileStream.open(profileStream.c_str(), omode);
+  Json::StreamWriterBuilder wbuilder;
+  this->JsonWriter =
+    std::unique_ptr<Json::StreamWriter>(wbuilder.newStreamWriter());
+  if (!this->ProfileStream.good()) {
+    throw std::runtime_error(std::string("Unable to open: ") + profileStream);
+  }
+
+  this->ProfileStream << "[";
+};
+
+cmMakefileProfilingData::~cmMakefileProfilingData() noexcept
+{
+  if (this->ProfileStream.good()) {
+    try {
+      this->ProfileStream << "]";
+      this->ProfileStream.close();
+    } catch (...) {
+      cmSystemTools::Error("Error writing profiling output!");
+    }
+  }
+}
+
+void cmMakefileProfilingData::StartEntry(const cmListFileFunction& lff,
+                                         cmListFileContext const& lfc)
+{
+  /* Do not try again if we previously failed to write to output. */
+  if (!this->ProfileStream.good()) {
+    return;
+  }
+
+  try {
+    if (this->ProfileStream.tellp() > 1) {
+      this->ProfileStream << ",";
+    }
+    cmsys::SystemInformation info;
+    Json::Value v;
+    v["ph"] = "B";
+    v["name"] = lff.Name.Lower;
+    v["cat"] = "cmake";
+    v["ts"] = Json::Value::UInt64(
+      std::chrono::duration_cast<std::chrono::microseconds>(
+        std::chrono::steady_clock::now().time_since_epoch())
+        .count());
+    v["pid"] = static_cast<int>(info.GetProcessId());
+    v["tid"] = 0;
+    Json::Value argsValue;
+    if (!lff.Arguments.empty()) {
+      std::string args;
+      for (const auto& a : lff.Arguments) {
+        args += (args.empty() ? "" : " ") + a.Value;
+      }
+      argsValue["functionArgs"] = args;
+    }
+    argsValue["location"] = lfc.FilePath + ":" + std::to_string(lfc.Line);
+    v["args"] = argsValue;
+
+    this->JsonWriter->write(v, &this->ProfileStream);
+  } catch (std::ios_base::failure& fail) {
+    cmSystemTools::Error(
+      cmStrCat("Failed to write to profiling output: ", fail.what()));
+  } catch (...) {
+    cmSystemTools::Error("Error writing profiling output!");
+  }
+}
+
+void cmMakefileProfilingData::StopEntry()
+{
+  /* Do not try again if we previously failed to write to output. */
+  if (!this->ProfileStream.good()) {
+    return;
+  }
+
+  try {
+    this->ProfileStream << ",";
+    cmsys::SystemInformation info;
+    Json::Value v;
+    v["ph"] = "E";
+    v["ts"] = Json::Value::UInt64(
+      std::chrono::duration_cast<std::chrono::microseconds>(
+        std::chrono::steady_clock::now().time_since_epoch())
+        .count());
+    v["pid"] = static_cast<int>(info.GetProcessId());
+    v["tid"] = 0;
+    this->JsonWriter->write(v, &this->ProfileStream);
+  } catch (std::ios_base::failure& fail) {
+    cmSystemTools::Error(
+      cmStrCat("Failed to write to profiling output:", fail.what()));
+  } catch (...) {
+    cmSystemTools::Error("Error writing profiling output!");
+  }
+}