Windows linker magic

gistfile1.txt

diff --git a/compiler-rt/lib/profile/InstrProfilingPlatformWindows.c b/compiler-rt/lib/profile/InstrProfilingPlatformWindows.c
index 4800ec72c77d..a7237a03fca2 100644
--- a/compiler-rt/lib/profile/InstrProfilingPlatformWindows.c
+++ b/compiler-rt/lib/profile/InstrProfilingPlatformWindows.c
@@ -28,6 +28,10 @@
 /* Allocate read-only section bounds. */
 #pragma section(".lprfn$A", read)
 #pragma section(".lprfn$Z", read)
+#pragma section(".lprfvn$A", read, write)
+#pragma section(".lprfvn$Z", read, write)
+#pragma section(".lprfvt$A", read, write)
+#pragma section(".lprfvt$Z", read, write)

 /* Allocate read-write section bounds. */
 #pragma section(".lprfd$A", read, write)
@@ -44,9 +48,15 @@
 __llvm_profile_data COMPILER_RT_SECTION(".lprfd$A") DataStart = {0};
 __llvm_profile_data COMPILER_RT_SECTION(".lprfd$Z") DataEnd = {0};

+VTableProfData COMPILER_RT_SECTION(".lprfvt$A") VTableProfDataStart = {0};
+VTableProfData COMPILER_RT_SECTION(".lprfvt$Z") VTableProfDataEnd = {0};
+
 const char COMPILER_RT_SECTION(".lprfn$A") NamesStart = '\0';
 const char COMPILER_RT_SECTION(".lprfn$Z") NamesEnd = '\0';

+const char COMPILER_RT_SECTION(".lprfvn$A") VNamesStart = '\0';
+const char COMPILER_RT_SECTION(".lprfvn$Z") VNamesEnd = '\0';
+
 char COMPILER_RT_SECTION(".lprfc$A") CountersStart;
 char COMPILER_RT_SECTION(".lprfc$Z") CountersEnd;
 char COMPILER_RT_SECTION(".lprfb$A") BitmapStart;
@@ -61,16 +71,19 @@ const __llvm_profile_data *__llvm_profile_begin_data(void) {
 }
 const __llvm_profile_data *__llvm_profile_end_data(void) { return &DataEnd; }

-// TODO: Implement the linker magic on Windows.
-const VTableProfData *__llvm_profile_begin_vtables(void) { return NULL; }
+const VTableProfData *__llvm_profile_begin_vtables(void) {
+  return &VTableProfDataStart + 1;
+}

-const VTableProfData *__llvm_profile_end_vtables(void) { return NULL; }
+const VTableProfData *__llvm_profile_end_vtables(void) {
+  return &VTableProfDataEnd;
+}

 const char *__llvm_profile_begin_names(void) { return &NamesStart + 1; }
 const char *__llvm_profile_end_names(void) { return &NamesEnd; }

-const char *__llvm_profile_begin_vtabnames(void) { return NULL; }
-const char *__llvm_profile_end_vtabnames(void) { return NULL; }
+const char *__llvm_profile_begin_vtabnames(void) { return &VNamesStart + 1; }
+const char *__llvm_profile_end_vtabnames(void) { return &VNamesEnd; }

 char *__llvm_profile_begin_counters(void) { return &CountersStart + 1; }
 char *__llvm_profile_end_counters(void) { return &CountersEnd; }