// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "src/api/api-inl.h"
#include "src/codegen/assembler-inl.h"
#include "src/trap-handler/trap-handler.h"
#include "test/cctest/cctest.h"
#include "test/cctest/compiler/value-helper.h"
#include "test/cctest/wasm/wasm-run-utils.h"
#include "test/common/wasm/test-signatures.h"
#include "test/common/wasm/wasm-macro-gen.h"

namespace v8 {
namespace internal {
namespace wasm {
namespace test_wasm_trap_position {

using v8::Local;
using v8::Utils;

namespace {

#define CHECK_CSTREQ(exp, found)                                              \
  do {                                                                        \
    const char* exp_ = (exp);                                                 \
    const char* found_ = (found);                                             \
    DCHECK_NOT_NULL(exp);                                                     \
    if (V8_UNLIKELY(found_ == nullptr || strcmp(exp_, found_) != 0)) {        \
      FATAL("Check failed: (%s) != (%s) ('%s' vs '%s').", #exp, #found, exp_, \
            found_ ? found_ : "<null>");                                      \
    }                                                                         \
  } while (false)

struct ExceptionInfo {
  const char* func_name;
  int line_nr;
  int column;
};

template <int N>
void CheckExceptionInfos(v8::internal::Isolate* i_isolate, Handle<Object> exc,
                         const ExceptionInfo (&excInfos)[N]) {
  // Check that it's indeed an Error object.
  CHECK(exc->IsJSError());
  v8::Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(i_isolate);

  exc->Print();
  // Extract stack frame from the exception.
  Local<v8::Value> localExc = Utils::ToLocal(exc);
  v8::Local<v8::StackTrace> stack = v8::Exception::GetStackTrace(localExc);
  CHECK(!stack.IsEmpty());
  CHECK_EQ(N, stack->GetFrameCount());

  for (int frameNr = 0; frameNr < N; ++frameNr) {
    v8::Local<v8::StackFrame> frame = stack->GetFrame(v8_isolate, frameNr);
    v8::String::Utf8Value funName(v8_isolate, frame->GetFunctionName());
    CHECK_CSTREQ(excInfos[frameNr].func_name, *funName);
    CHECK_EQ(excInfos[frameNr].line_nr, frame->GetLineNumber());
    CHECK_EQ(excInfos[frameNr].column, frame->GetColumn());
  }
}

#undef CHECK_CSTREQ

}  // namespace

// Trigger a trap for executing unreachable.
WASM_EXEC_TEST(Unreachable) {
  // Create a WasmRunner with stack checks and traps enabled.
  WasmRunner<void> r(execution_tier, nullptr, "main", kRuntimeExceptionSupport);
  TestSignatures sigs;

  BUILD(r, WASM_UNREACHABLE);
  uint32_t wasm_index = r.function()->func_index;

  Handle<JSFunction> js_wasm_wrapper = r.builder().WrapCode(wasm_index);

  Handle<JSFunction> js_trampoline = Handle<JSFunction>::cast(
      v8::Utils::OpenHandle(*v8::Local<v8::Function>::Cast(
          CompileRun("(function callFn(fn) { fn(); })"))));

  Isolate* isolate = js_wasm_wrapper->GetIsolate();
  isolate->SetCaptureStackTraceForUncaughtExceptions(true, 10,
                                                     v8::StackTrace::kOverview);
  Handle<Object> global(isolate->context().global_object(), isolate);
  MaybeHandle<Object> maybe_exc;
  Handle<Object> args[] = {js_wasm_wrapper};
  MaybeHandle<Object> returnObjMaybe =
      Execution::TryCall(isolate, js_trampoline, global, 1, args,
                         Execution::MessageHandling::kReport, &maybe_exc);
  CHECK(returnObjMaybe.is_null());

  // Line and column are 1-based, so add 1 for the expected wasm output.
  ExceptionInfo expected_exceptions[] = {
      {"main", static_cast<int>(wasm_index) + 1, 2},  // --
      {"callFn", 1, 24}                               // --
  };
  CheckExceptionInfos(isolate, maybe_exc.ToHandleChecked(),
                      expected_exceptions);
}

// Trigger a trap for loading from out-of-bounds.
WASM_EXEC_TEST(IllegalLoad) {
  WasmRunner<void> r(execution_tier, nullptr, "main", kRuntimeExceptionSupport);
  TestSignatures sigs;

  r.builder().AddMemory(0L);

  BUILD(r, WASM_IF(WASM_ONE, WASM_SEQ(WASM_LOAD_MEM(MachineType::Int32(),
                                                    WASM_I32V_1(-3)),
                                      WASM_DROP)));
  uint32_t wasm_index_1 = r.function()->func_index;

  WasmFunctionCompiler& f2 = r.NewFunction<void>("call_main");
  // Insert a NOP such that the position of the call is not one.
  BUILD(f2, WASM_NOP, WASM_CALL_FUNCTION0(wasm_index_1));
  uint32_t wasm_index_2 = f2.function_index();

  Handle<JSFunction> js_wasm_wrapper = r.builder().WrapCode(wasm_index_2);

  Handle<JSFunction> js_trampoline = Handle<JSFunction>::cast(
      v8::Utils::OpenHandle(*v8::Local<v8::Function>::Cast(
          CompileRun("(function callFn(fn) { fn(); })"))));

  Isolate* isolate = js_wasm_wrapper->GetIsolate();
  isolate->SetCaptureStackTraceForUncaughtExceptions(true, 10,
                                                     v8::StackTrace::kOverview);
  Handle<Object> global(isolate->context().global_object(), isolate);
  MaybeHandle<Object> maybe_exc;
  Handle<Object> args[] = {js_wasm_wrapper};
  MaybeHandle<Object> returnObjMaybe =
      Execution::TryCall(isolate, js_trampoline, global, 1, args,
                         Execution::MessageHandling::kReport, &maybe_exc);
  CHECK(returnObjMaybe.is_null());

  // Line and column are 1-based, so add 1 for the expected wasm output.
  ExceptionInfo expected_exceptions[] = {
      {"main", static_cast<int>(wasm_index_1) + 1, 8},       // --
      {"call_main", static_cast<int>(wasm_index_2) + 1, 3},  // --
      {"callFn", 1, 24}                                      // --
  };
  CheckExceptionInfos(isolate, maybe_exc.ToHandleChecked(),
                      expected_exceptions);
}

}  // namespace test_wasm_trap_position
}  // namespace wasm
}  // namespace internal
}  // namespace v8