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//===-- diagnostic.cpp - tool for testing libLLVM and llvm-c API ----------===//
// 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
// This file implements the --test-diagnostic-handler command in llvm-c-test.
// This command uses the C API to read a module with a custom diagnostic
// handler set to test the diagnostic handler functionality.

#include "llvm-c-test.h"
#include "llvm-c/BitReader.h"
#include "llvm-c/Core.h"

#include <stdio.h>

static void diagnosticHandler(LLVMDiagnosticInfoRef DI, void *C) {
  fprintf(stderr, "Executing diagnostic handler\n");

  fprintf(stderr, "Diagnostic severity is of type ");
  switch (LLVMGetDiagInfoSeverity(DI)) {
  case LLVMDSError:
    fprintf(stderr, "error");
  case LLVMDSWarning:
    fprintf(stderr, "warning");
  case LLVMDSRemark:
    fprintf(stderr, "remark");
  case LLVMDSNote:
    fprintf(stderr, "note");
  fprintf(stderr, "\n");

  (*(int *)C) = 1;

static int handlerCalled = 0;

int llvm_test_diagnostic_handler(void) {
  LLVMContextRef C = LLVMGetGlobalContext();
  LLVMContextSetDiagnosticHandler(C, diagnosticHandler, &handlerCalled);

  if (LLVMContextGetDiagnosticHandler(C) != diagnosticHandler) {
    fprintf(stderr, "LLVMContext{Set,Get}DiagnosticHandler failed\n");
    return 1;

  int *DC = (int *)LLVMContextGetDiagnosticContext(C);
  if (DC != &handlerCalled || *DC) {
    fprintf(stderr, "LLVMContextGetDiagnosticContext failed\n");
    return 1;

  LLVMMemoryBufferRef MB;
  char *msg = NULL;
  if (LLVMCreateMemoryBufferWithSTDIN(&MB, &msg)) {
    fprintf(stderr, "Error reading file: %s\n", msg);
    return 1;

  LLVMModuleRef M;
  int Ret = LLVMGetBitcodeModule2(MB, &M);
  if (Ret) {
    // We do not return if the bitcode was invalid, as we want to test whether
    // the diagnostic handler was executed.
    fprintf(stderr, "Error parsing bitcode: %s\n", msg);


  if (handlerCalled) {
    fprintf(stderr, "Diagnostic handler was called while loading module\n");
  } else {
    fprintf(stderr, "Diagnostic handler was not called while loading module\n");

  return 0;