[MinGW][Coverage] Workaround for missing lprofGetHostName.

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/KonanConfig.kt

@@ -150,9 +150,13 @@ class KonanConfig(val project: Project, val configuration: CompilerConfiguration
         return resolvedLibraries.filterRoots { (!it.isDefault && !this.purgeUserLibs) || it.isNeededForLink }.getFullList(TopologicalLibraryOrder) as List<KonanLibrary>
     }
 
+    val shouldCoverSources = configuration.getBoolean(KonanConfigKeys.COVERAGE)
+    val shouldCoverLibraries = !configuration.getList(KonanConfigKeys.LIBRARIES_TO_COVER).isNullOrEmpty()
+
     internal val runtimeNativeLibraries: List<String> = mutableListOf<String>().apply {
         add(if (debug) "debug.bc" else "release.bc")
         add(if (memoryModel == MemoryModel.STRICT) "strict.bc" else "relaxed.bc")
+        if (shouldCoverLibraries || shouldCoverSources) add("profileRuntime.bc")
     }.map {
         File(distribution.defaultNatives(target)).child(it).absolutePath
     }

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/coverage/CoverageManager.kt

@@ -21,8 +21,8 @@ import org.jetbrains.kotlin.resolve.descriptorUtil.module
  */
 internal class CoverageManager(val context: Context) {
 
-    private val shouldCoverProgram: Boolean =
-            context.config.configuration.getBoolean(KonanConfigKeys.COVERAGE)
+    private val shouldCoverSources: Boolean =
+            context.config.shouldCoverSources
 
     private val librariesToCover: Set<String> =
             context.config.coveredLibraries.map { it.libraryName }.toSet()
@@ -39,7 +39,7 @@ internal class CoverageManager(val context: Context) {
                     ?: defaultOutputFilePath
 
     val enabled: Boolean =
-            shouldCoverProgram || librariesToCover.isNotEmpty()
+            shouldCoverSources || librariesToCover.isNotEmpty()
 
     init {
         if (enabled && !checkRestrictions()) {
@@ -60,10 +60,10 @@ internal class CoverageManager(val context: Context) {
             filesRegionsInfo.flatMap { it.functions }.firstOrNull { it.function == irFunction }
 
     private val coveredModules: Set<ModuleDescriptor> by lazy {
-        val coveredUserCode = if (shouldCoverProgram) setOf(context.moduleDescriptor) else emptySet()
+        val coveredUserCode = if (shouldCoverSources) setOf(context.moduleDescriptor) else emptySet()
         val coveredLibs = context.irModules.filter { it.key in librariesToCover }.values
                 .map { it.descriptor }.toSet()
-        val coveredIncludedLibs = if (shouldCoverProgram) context.getIncludedLibraryDescriptors().toSet() else emptySet()
+        val coveredIncludedLibs = if (shouldCoverSources) context.getIncludedLibraryDescriptors().toSet() else emptySet()
         coveredLibs + coveredUserCode + coveredIncludedLibs
     }
 

runtime/build.gradle

@@ -21,6 +21,7 @@ targetList.each { targetName ->
         dependsOn "${targetName}Release"
         dependsOn "${targetName}Strict"
         dependsOn "${targetName}Relaxed"
+        dependsOn "${targetName}ProfileRuntime"
         target targetName
         includeRuntime(delegate)
         linkerArgs project.file("../common/build/$targetName/hash.bc").path
@@ -60,6 +61,12 @@ targetList.each { targetName ->
         target targetName
         includeRuntime(delegate)
     }
+
+    task ("${targetName}ProfileRuntime", type: CompileCppToBitcode) {
+        name "profileRuntime"
+        srcRoot file('src/profile_runtime')
+        target targetName
+    }
 }
 
 task hostRuntime(dependsOn: "${hostName}Runtime")

runtime/src/profile_runtime/cpp/ProfileRuntime.cpp

@@ -0,0 +1,28 @@
+// Define symbols that are required for code coverage but missing in compiler-RT for MinGW.

+// See https://reviews.llvm.org/D58106/ for details.
+#ifdef KONAN_WINDOWS
+
+#include <windows.h>
+
+extern "C" {
+
+__attribute__((used))
+int lprofGetHostName(char *hostName, int length) {
+  const int maxHostNameLength = 128;
+  WCHAR buffer[maxHostNameLength];
+  DWORD bufferSize = sizeof(buffer);
+  COMPUTER_NAME_FORMAT nameType = ComputerNameDnsFullyQualified;
+  if (!GetComputerNameExW(nameType, buffer, &bufferSize)) {
+    return -1;
+  }
+  int bytesWritten = WideCharToMultiByte(CP_UTF8, 0, buffer, -1, hostName, length, nullptr, nullptr);
+  if (bytesWritten == 0) {
+    return -1;
+  } else {
+    return 0;
+  }
+}
+
+}
+
+#endif