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#include <iterator>
#include "js/ErrorInterceptor.h"
#include "jsapi-tests/tests.h"
#include "util/StringBuilder.h"
// Tests for JS_GetErrorInterceptorCallback and JS_SetErrorInterceptorCallback.
namespace {
MOZ_RUNINIT static JS::PersistentRootedString gLatestMessage;
// An interceptor that stores the error in `gLatestMessage`.
struct SimpleInterceptor : JSErrorInterceptor {
virtual void interceptError(JSContext* cx, JS::HandleValue val) override {
js::JSStringBuilder buffer(cx);
if (!ValueToStringBuilder(cx, val, buffer)) {
MOZ_CRASH("Could not convert to string buffer");
}
gLatestMessage = buffer.finishString();
if (!gLatestMessage) {
MOZ_CRASH("Could not convert to string");
}
}
};
bool equalStrings(JSContext* cx, JSString* a, JSString* b) {
int32_t result = 0;
if (!JS_CompareStrings(cx, a, b, &result)) {
MOZ_CRASH("Could not compare strings");
}
return result == 0;
}
} // namespace
BEGIN_TEST(testErrorInterceptor) {
// Run the following snippets.
const char* SAMPLES[] = {
"throw new Error('I am an Error')\0",
"throw new TypeError('I am a TypeError')\0",
"throw new ReferenceError('I am a ReferenceError')\0",
"throw new SyntaxError('I am a SyntaxError')\0",
"throw 5\0",
"foo[0]\0",
"b[\0",
};
// With the simpleInterceptor, we should end up with the following error:
const char* TO_STRING[] = {
"Error: I am an Error\0",
"TypeError: I am a TypeError\0",
"ReferenceError: I am a ReferenceError\0",
"SyntaxError: I am a SyntaxError\0",
"5\0",
"ReferenceError: foo is not defined\0",
"SyntaxError: expected expression, got end of script\0",
};
static_assert(std::size(SAMPLES) == std::size(TO_STRING));
// Save original callback.
JSErrorInterceptor* original = JS_GetErrorInterceptorCallback(cx->runtime());
gLatestMessage.init(cx);
// Test without callback.
JS_SetErrorInterceptorCallback(cx->runtime(), nullptr);
CHECK(gLatestMessage == nullptr);
for (auto sample : SAMPLES) {
if (execDontReport(sample, __FILE__, __LINE__)) {
MOZ_CRASH("This sample should have failed");
}
CHECK(JS_IsExceptionPending(cx));
CHECK(gLatestMessage == nullptr);
JS_ClearPendingException(cx);
}
// Test with callback.
SimpleInterceptor simpleInterceptor;
JS_SetErrorInterceptorCallback(cx->runtime(), &simpleInterceptor);
// Test that we return the right callback.
CHECK_EQUAL(JS_GetErrorInterceptorCallback(cx->runtime()),
&simpleInterceptor);
// This shouldn't cause any error.
EXEC("function bar() {}");
CHECK(gLatestMessage == nullptr);
// Test error throwing with a callback that succeeds.
for (size_t i = 0; i < std::size(SAMPLES); ++i) {
// This should cause the appropriate error.
if (execDontReport(SAMPLES[i], __FILE__, __LINE__)) {
MOZ_CRASH("This sample should have failed");
}
CHECK(JS_IsExceptionPending(cx));
// Check result of callback.
CHECK(gLatestMessage != nullptr);
CHECK(js::StringEqualsAscii(&gLatestMessage->asLinear(), TO_STRING[i]));
// Check the final error.
JS::RootedValue exn(cx);
CHECK(JS_GetPendingException(cx, &exn));
JS_ClearPendingException(cx);
js::JSStringBuilder buffer(cx);
CHECK(ValueToStringBuilder(cx, exn, buffer));
JS::Rooted<JSLinearString*> linear(cx, buffer.finishString());
CHECK(equalStrings(cx, linear, gLatestMessage));
// Cleanup.
gLatestMessage = nullptr;
}
// Test again without callback.
JS_SetErrorInterceptorCallback(cx->runtime(), nullptr);
for (size_t i = 0; i < std::size(SAMPLES); ++i) {
if (execDontReport(SAMPLES[i], __FILE__, __LINE__)) {
MOZ_CRASH("This sample should have failed");
}
CHECK(JS_IsExceptionPending(cx));
// Check that the callback wasn't called.
CHECK(gLatestMessage == nullptr);
// Check the final error.
JS::RootedValue exn(cx);
CHECK(JS_GetPendingException(cx, &exn));
JS_ClearPendingException(cx);
js::JSStringBuilder buffer(cx);
CHECK(ValueToStringBuilder(cx, exn, buffer));
JS::Rooted<JSLinearString*> linear(cx, buffer.finishString());
CHECK(js::StringEqualsAscii(linear, TO_STRING[i]));
// Cleanup.
gLatestMessage = nullptr;
}
// Cleanup
JS_SetErrorInterceptorCallback(cx->runtime(), original);
gLatestMessage = nullptr;
JS_ClearPendingException(cx);
return true;
}
END_TEST(testErrorInterceptor)