//===- pass.c - Simple test of C APIs -------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

/* RUN: mlir-capi-pass-test 2>&1 | FileCheck %s
 */

#include "mlir-c/Pass.h"
#include "mlir-c/IR.h"
#include "mlir-c/Registration.h"
#include "mlir-c/Transforms.h"

#include <assert.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void testRunPassOnModule() {
  MlirContext ctx = mlirContextCreate();
  mlirRegisterAllDialects(ctx);

  MlirModule module = mlirModuleCreateParse(
      ctx,
      // clang-format off
                            mlirStringRefCreateFromCString(
"func @foo(%arg0 : i32) -> i32 {                                            \n"
"  %res = addi %arg0, %arg0 : i32                                           \n"
"  return %res : i32                                                        \n"
"}"));
  // clang-format on
  if (mlirModuleIsNull(module)) {
    fprintf(stderr, "Unexpected failure parsing module.\n");
    exit(EXIT_FAILURE);
  }

  // Run the print-op-stats pass on the top-level module:
  // CHECK-LABEL: Operations encountered:
  // CHECK: func              , 1
  // CHECK: module_terminator , 1
  // CHECK: std.addi          , 1
  // CHECK: std.return        , 1
  {
    MlirPassManager pm = mlirPassManagerCreate(ctx);
    MlirPass printOpStatPass = mlirCreateTransformsPrintOpStats();
    mlirPassManagerAddOwnedPass(pm, printOpStatPass);
    MlirLogicalResult success = mlirPassManagerRun(pm, module);
    if (mlirLogicalResultIsFailure(success)) {
      fprintf(stderr, "Unexpected failure running pass manager.\n");
      exit(EXIT_FAILURE);
    }
    mlirPassManagerDestroy(pm);
  }
  mlirModuleDestroy(module);
  mlirContextDestroy(ctx);
}

void testRunPassOnNestedModule() {
  MlirContext ctx = mlirContextCreate();
  mlirRegisterAllDialects(ctx);

  MlirModule module = mlirModuleCreateParse(
      ctx,
      // clang-format off
                            mlirStringRefCreateFromCString(
"func @foo(%arg0 : i32) -> i32 {                                            \n"
"  %res = addi %arg0, %arg0 : i32                                           \n"
"  return %res : i32                                                        \n"
"}                                                                          \n"
"module {                                                                   \n"
"  func @bar(%arg0 : f32) -> f32 {                                          \n"
"    %res = addf %arg0, %arg0 : f32                                         \n"
"    return %res : f32                                                      \n"
"  }                                                                        \n"
"}"));
  // clang-format on
  if (mlirModuleIsNull(module))
    exit(1);

  // Run the print-op-stats pass on functions under the top-level module:
  // CHECK-LABEL: Operations encountered:
  // CHECK-NOT: module_terminator
  // CHECK: func              , 1
  // CHECK: std.addi          , 1
  // CHECK: std.return        , 1
  {
    MlirPassManager pm = mlirPassManagerCreate(ctx);
    MlirOpPassManager nestedFuncPm = mlirPassManagerGetNestedUnder(
        pm, mlirStringRefCreateFromCString("func"));
    MlirPass printOpStatPass = mlirCreateTransformsPrintOpStats();
    mlirOpPassManagerAddOwnedPass(nestedFuncPm, printOpStatPass);
    MlirLogicalResult success = mlirPassManagerRun(pm, module);
    if (mlirLogicalResultIsFailure(success))
      exit(2);
    mlirPassManagerDestroy(pm);
  }
  // Run the print-op-stats pass on functions under the nested module:
  // CHECK-LABEL: Operations encountered:
  // CHECK-NOT: module_terminator
  // CHECK: func              , 1
  // CHECK: std.addf          , 1
  // CHECK: std.return        , 1
  {
    MlirPassManager pm = mlirPassManagerCreate(ctx);
    MlirOpPassManager nestedModulePm = mlirPassManagerGetNestedUnder(
        pm, mlirStringRefCreateFromCString("module"));
    MlirOpPassManager nestedFuncPm = mlirOpPassManagerGetNestedUnder(
        nestedModulePm, mlirStringRefCreateFromCString("func"));
    MlirPass printOpStatPass = mlirCreateTransformsPrintOpStats();
    mlirOpPassManagerAddOwnedPass(nestedFuncPm, printOpStatPass);
    MlirLogicalResult success = mlirPassManagerRun(pm, module);
    if (mlirLogicalResultIsFailure(success))
      exit(2);
    mlirPassManagerDestroy(pm);
  }

  mlirModuleDestroy(module);
  mlirContextDestroy(ctx);
}

static void printToStderr(MlirStringRef str, void *userData) {
  (void)userData;
  fwrite(str.data, 1, str.length, stderr);
}

void testPrintPassPipeline() {
  MlirContext ctx = mlirContextCreate();
  MlirPassManager pm = mlirPassManagerCreate(ctx);
  // Populate the pass-manager
  MlirOpPassManager nestedModulePm = mlirPassManagerGetNestedUnder(
      pm, mlirStringRefCreateFromCString("module"));
  MlirOpPassManager nestedFuncPm = mlirOpPassManagerGetNestedUnder(
      nestedModulePm, mlirStringRefCreateFromCString("func"));
  MlirPass printOpStatPass = mlirCreateTransformsPrintOpStats();
  mlirOpPassManagerAddOwnedPass(nestedFuncPm, printOpStatPass);

  // Print the top level pass manager
  // CHECK: Top-level: module(func(print-op-stats))
  fprintf(stderr, "Top-level: ");
  mlirPrintPassPipeline(mlirPassManagerGetAsOpPassManager(pm), printToStderr,
                        NULL);
  fprintf(stderr, "\n");

  // Print the pipeline nested one level down
  // CHECK: Nested Module: func(print-op-stats)
  fprintf(stderr, "Nested Module: ");
  mlirPrintPassPipeline(nestedModulePm, printToStderr, NULL);
  fprintf(stderr, "\n");

  // Print the pipeline nested two levels down
  // CHECK: Nested Module>Func: print-op-stats
  fprintf(stderr, "Nested Module>Func: ");
  mlirPrintPassPipeline(nestedFuncPm, printToStderr, NULL);
  fprintf(stderr, "\n");

  mlirPassManagerDestroy(pm);
  mlirContextDestroy(ctx);
}

void testParsePassPipeline() {
  MlirContext ctx = mlirContextCreate();
  MlirPassManager pm = mlirPassManagerCreate(ctx);
  // Try parse a pipeline.
  MlirLogicalResult status = mlirParsePassPipeline(
      mlirPassManagerGetAsOpPassManager(pm),
      mlirStringRefCreateFromCString(
          "module(func(print-op-stats), func(print-op-stats))"));
  // Expect a failure, we haven't registered the print-op-stats pass yet.
  if (mlirLogicalResultIsSuccess(status)) {
    fprintf(stderr, "Unexpected success parsing pipeline without registering the pass\n");
    exit(EXIT_FAILURE);
  }
  // Try again after registrating the pass.
  mlirRegisterTransformsPrintOpStats();
  status = mlirParsePassPipeline(
      mlirPassManagerGetAsOpPassManager(pm),
      mlirStringRefCreateFromCString(
          "module(func(print-op-stats), func(print-op-stats))"));
  // Expect a failure, we haven't registered the print-op-stats pass yet.
  if (mlirLogicalResultIsFailure(status)) {
    fprintf(stderr, "Unexpected failure parsing pipeline after registering the pass\n");
    exit(EXIT_FAILURE);
  }

  // CHECK: Round-trip: module(func(print-op-stats), func(print-op-stats))
  fprintf(stderr, "Round-trip: ");
  mlirPrintPassPipeline(mlirPassManagerGetAsOpPassManager(pm), printToStderr,
                        NULL);
  fprintf(stderr, "\n");
}

int main() {
  testRunPassOnModule();
  testRunPassOnNestedModule();
  testPrintPassPipeline();
  testParsePassPipeline();
  return 0;
}