[OpenMP][OMPD] Implementation of OMPD debugging library - libompd.

This is a continuation of the review: https://reviews.llvm.org/D100183
It contains routines that retrieve OpenMP ICV values for OMPD.

Reviewed By: @hbae
Differential Revision: https://reviews.llvm.org/D100184

openmp/libompd/src/CMakeLists.txt

@@ -11,7 +11,7 @@
 project (libompd)
 cmake_minimum_required(VERSION 3.13.4)
 
-add_library (ompd SHARED TargetValue.cpp omp-debug.cpp)
+add_library (ompd SHARED TargetValue.cpp omp-debug.cpp omp-state.cpp omp-icv.cpp)
 
 add_dependencies(ompd omp) # ensure generated import library is created first
 
@@ -38,9 +38,6 @@ if(${LIBOMPD_LD_STD_FLAGS})
    endif()
 endif()
 
-#TODO: Required temporarily for lib to build as during patch submission.
-#when lld used, it expects every symbol to be defined, whereas a few function defined as a part of the next patch
-string(REPLACE "-Wl,-z,defs" "" CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS}")
 include_directories (
         ${CMAKE_CURRENT_SOURCE_DIR}
         ${LIBOMP_INCLUDE_DIR}

openmp/libompd/src/omp-state.cpp

@@ -0,0 +1,64 @@
+/*
+ * omp-state.cpp -- OMPD states
+ */
+
+//===----------------------------------------------------------------------===//
+//
+// 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 "omp-debug.h"
+#include "ompd-private.h"
+#include <cstring>
+
+void __ompd_init_states(const ompd_callbacks_t *table) { callbacks = table; }
+
+static const char *get_ompd_state_name(ompd_word_t state) {
+  switch (state) {
+#define ompd_state_macro(state, code)                                          \
+  case code:                                                                   \
+    return #state;
+    FOREACH_OMPD_STATE(ompd_state_macro)
+#undef ompd_state_macro
+  default:
+    return NULL;
+  }
+}
+
+ompd_rc_t
+ompd_enumerate_states(ompd_address_space_handle_t *address_space_handle,
+                      ompd_word_t current_state, ompd_word_t *next_state,
+                      const char **next_state_name, ompd_word_t *more_enums) {
+  ompd_rc_t ret;
+  if (current_state > ompt_state_undefined &&
+      current_state >= OMPD_LAST_OMP_STATE) {
+    return ompd_rc_bad_input;
+  }
+  const char *find_next_state_name;
+  *next_state = (current_state == ompt_state_undefined ? ompt_state_work_serial
+                                                       : current_state + 1);
+  while (!(find_next_state_name = get_ompd_state_name(*next_state))) {
+    ++(*next_state);
+  }
+
+  char *next_state_name_cpy;
+  ret = callbacks->alloc_memory(strlen(find_next_state_name) + 1,
+                                (void **)&next_state_name_cpy);
+  if (ret != ompd_rc_ok) {
+    return ret;
+  }
+  strcpy(next_state_name_cpy, find_next_state_name);
+
+  *next_state_name = next_state_name_cpy;
+
+  if (*next_state == OMPD_LAST_OMP_STATE) {
+    *more_enums = 0;
+  } else {
+    *more_enums = 1;
+  }
+
+  return ompd_rc_ok;
+}