instrumentation: Fix crash on cmake_instrumentation() call in initial cache

Source/cmake.cxx

@@ -719,6 +719,7 @@ bool cmake::SetCacheArgs(std::vector<std::string> const& args)
         // relative to $PWD.
         auto path = cmSystemTools::ToNormalizedPathOnDisk(value);
         state->InitializeFileAPI();
+        state->InitializeInstrumentation();
         state->ReadListFile(args, path);
         return true;
       } },
@@ -2668,11 +2669,7 @@ int cmake::ActualConfigure()
 #if !defined(CMAKE_BOOTSTRAP)
   this->InitializeFileAPI();
   this->FileAPI->ReadQueries();
-
-  this->Instrumentation = cm::make_unique<cmInstrumentation>(
-    this->State->GetBinaryDirectory(),
-    cmInstrumentation::LoadQueriesAfter::No);
-  this->Instrumentation->ClearGeneratedQueries();
+  this->InitializeInstrumentation();
 
   if (!this->GetIsInTryCompile()) {
     this->TruncateOutputLog("CMakeConfigureLog.yaml");
@@ -2939,6 +2936,18 @@ void cmake::InitializeFileAPI()
 #endif
 }
 
+void cmake::InitializeInstrumentation()
+{
+#ifndef CMAKE_BOOTSTRAP
+  if (!this->Instrumentation) {
+    this->Instrumentation = cm::make_unique<cmInstrumentation>(
+      this->State->GetBinaryDirectory(),
+      cmInstrumentation::LoadQueriesAfter::No);
+    this->Instrumentation->ClearGeneratedQueries();
+  }
+#endif
+}
+
 // handle a command line invocation
 int cmake::Run(std::vector<std::string> const& args, bool noconfigure)
 {

Source/cmake.h

@@ -709,6 +709,7 @@ public:
   }
 #endif
   void InitializeFileAPI();
+  void InitializeInstrumentation();
 
   cmState* GetState() const { return this->State.get(); }
   void SetCurrentSnapshot(cmStateSnapshot const& snapshot)

Tests/RunCMake/Instrumentation/RunCMakeTest.cmake

@@ -28,6 +28,7 @@ function(instrument test)
   set(v1 ${RunCMake_TEST_BINARY_DIR}/.cmake/instrumentation-${uuid}/v1)
   set(v1 ${v1} PARENT_SCOPE)
   set(query_dir ${CMAKE_CURRENT_LIST_DIR}/query)
+  configure_file(${RunCMake_SOURCE_DIR}/initial.cmake.in ${RunCMake_BINARY_DIR}/initial.cmake)
 
   # Clear previous instrumentation data
   # We can't use RunCMake_TEST_NO_CLEAN 0 because we preserve queries placed in the build tree after
@@ -189,6 +190,10 @@ instrument(cmake-command-bad-arg NO_WARN)
 instrument(cmake-command-parallel-install
   BUILD INSTALL TEST NO_WARN INSTALL_PARALLEL DYNAMIC_QUERY
   CHECK_SCRIPT check-data-dir.cmake)
+instrument(cmake-command-initial-cache
+  CONFIGURE_ARG "-C ${RunCMake_BINARY_DIR}/initial.cmake"
+  CHECK_SCRIPT check-data-dir.cmake
+)
 instrument(cmake-command-resets-generated
   NO_WARN COPY_QUERIES_GENERATED
   CHECK_SCRIPT check-data-dir.cmake

Tests/RunCMake/Instrumentation/cmake-command-initial-cache-stderr.txt

@@ -0,0 +1,4 @@
+CMake Warning \(dev\) at .*
+  CMake's support for collecting instrumentation data is experimental.  It is
+  meant only for experimentation and feedback to CMake developers.
+This warning is for project developers.  Use -Wno-dev to suppress it.

Tests/RunCMake/Instrumentation/initial.cmake.in

@@ -0,0 +1,5 @@
+set(CMAKE_EXPERIMENTAL_INSTRUMENTATION @uuid@)
+cmake_instrumentation(
+  API_VERSION 1
+  DATA_VERSION 1
+)