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n-api: fix warning about size_t compare with int #15508

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n-api: fix warning about size_t compare with int #15508

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657d660
n-api: fix warning about size_t compare with int
Sep 20, 2017
b1bf44a
Define NAPI_AUTO_LENGTH for string length
Sep 21, 2017
a7ab686
Use std::string for copying string
Sep 22, 2017
c4732e7
squash: address latest comments
mhdawson Sep 22, 2017
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40 changes: 23 additions & 17 deletions src/node_api.cc
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Expand Up @@ -120,13 +120,14 @@ struct napi_env__ {
#define CHECK_NEW_FROM_UTF8_LEN(env, result, str, len) \
do { \
auto str_maybe = v8::String::NewFromUtf8( \
(env)->isolate, (str), v8::NewStringType::kInternalized, (len)); \
(env)->isolate, (str), v8::NewStringType::kInternalized, \
static_cast<int>(len)); \
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It would be nice to have a static_assert(static_cast<int>(NAPI_AUTO_LENGTH) == -1) somewhere

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@addaleax that is a good idea.

Do you think it would make sense to add it just after

namespace {
namespace v8impl {

in node_api.cc

along with a comment indicating the v8 implementation of n-api depends on it being true ?

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@mhdawson I like to put that near where it’s actually used (i.e. around here) but feel free to put it wherever you like :)

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I was thinking you had somewhere else in mind, I'm good with it going into the macro itself

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@mhdawson The issue remains that this static_cast is invalid if len > INT_MAX && len != NAPI_AUTO_LENGTH, there needs to code that checks for that condition and errors out if it is met … if necessary, I guess that can be done in a subsequent PR, but it’s a bug that ought to be fixed.

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@addaleax thanks for the clarification, will look at that. Since we want to have the breaking changes in before 8.6 and we are almost out of time I may do it in a follow up PR, but I'll see on Monday.

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@mhdawson mhdawson Sep 22, 2017 •
edited
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I think this check may do the trick

RETURN_STATUS_IF_FALSE((env), len <= INT_MAX, (napi_invalid_arg));

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I do think you need to check for NAPI_AUTO_LENGTH because that value is usually larger than INT_MAX :) But yes, something like that sounds good

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@addaleax agreed I also need to check for NAPI_AUTO_LENGTH. I'm going to land this PR to make sure we don't fix the Tuesday cutoff, and I'll submit a separate one to fix the bug caused by the cast on Monday.

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To be clear, the current check does not have well-defined behavior. Compiler A might do the right thing, compiler B might do something completely different. IOW, this is not release-ready code.

CHECK_MAYBE_EMPTY((env), str_maybe, napi_generic_failure); \
(result) = str_maybe.ToLocalChecked(); \
} while (0)

#define CHECK_NEW_FROM_UTF8(env, result, str) \
CHECK_NEW_FROM_UTF8_LEN((env), (result), (str), -1)
CHECK_NEW_FROM_UTF8_LEN((env), (result), (str), NAPI_AUTO_LENGTH)

#define GET_RETURN_STATUS(env) \
(!try_catch.HasCaught() ? napi_ok \
Expand Down Expand Up @@ -918,21 +919,26 @@ NAPI_NO_RETURN void napi_fatal_error(const char* location,
size_t location_len,
const char* message,
size_t message_len) {
char* location_string = const_cast<char*>(location);
char* message_string = const_cast<char*>(message);
if (location_len != -1) {
location_string = reinterpret_cast<char*>(
malloc(location_len * sizeof(char) + 1));
strncpy(location_string, location, location_len);
location_string[location_len] = '\0';
}
if (message_len != -1) {
message_string = reinterpret_cast<char*>(
malloc(message_len * sizeof(char) + 1));
strncpy(message_string, message, message_len);
message_string[message_len] = '\0';
}
node::FatalError(location_string, message_string);
std::string location_string;
std::string message_string;

if (static_cast<int>(location_len) != NAPI_AUTO_LENGTH) {
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@fhinkel fhinkel Sep 22, 2017 •
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I don't think that size_t always fits into an int. Why do we need to cast here? (Feel free to land once this is addressed if I don't get around to change my review to approve in time.)

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I agree it should not be needed in this check. In places where it is passed on to v8 then it is needed.

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@mhdawson No, the issue isn’t that it’s in the wrong place – it’s that a downcast is a real bug here, because it truncates location_len

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@addaleax, to clarify we know that size_t does not fit into an int, so where its going to be passed to v8 a cast is required to avoid warnings. In this case we should just be comparing NAPI_AUTO_LENGTH directly against location_len.

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@mhdawson Yeah, but we can’t just downcast without any checks in this case. Imagine a platform that has 32-bit int, and 64-bit size_t. When an addon tries to create a N-API string that contains (2^32 + 1) characters – not knowing that that doesn’t work, because, how would it tell? – N-API would currently silently truncate that size argument to 1, and happily create a one-character string. I think that qualifies as a bug.

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I think I'm still missing something here, sorry. If we change to be:

if (location_len != NAPI_AUTO_LENGTH)

is it that there is a problem later on ?

location_string.assign(
const_cast<char*>(location), location_len);
} else {
location_string.assign(
const_cast<char*>(location), strlen(location));
}

if (static_cast<int>(message_len) != NAPI_AUTO_LENGTH) {
message_string.assign(
const_cast<char*>(message), message_len);
} else {
message_string.assign(
const_cast<char*>(message), strlen(message));
}

node::FatalError(location_string.c_str(), message_string.c_str());
}

napi_status napi_create_function(napi_env env,
Expand Down
2 changes: 2 additions & 0 deletions src/node_api.h
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Expand Up @@ -100,6 +100,8 @@ typedef struct {
#define NAPI_MODULE(modname, regfunc) \
NAPI_MODULE_X(modname, regfunc, NULL, 0)

#define NAPI_AUTO_LENGTH SIZE_MAX

EXTERN_C_START

NAPI_EXTERN void napi_module_register(napi_module* mod);
Expand Down
8 changes: 4 additions & 4 deletions test/addons-napi/test_async/test_async.cc
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Expand Up @@ -95,8 +95,8 @@ napi_value Test(napi_env env, napi_callback_info info) {
NAPI_CALL(env,
napi_create_reference(env, argv[2], 1, &the_carrier._callback));

NAPI_CALL(env,
napi_create_string_utf8(env, "TestResource", -1, &resource_name));
NAPI_CALL(env, napi_create_string_utf8(
env, "TestResource", NAPI_AUTO_LENGTH, &resource_name));
NAPI_CALL(env, napi_create_async_work(env, argv[1], resource_name,
Execute, Complete, &the_carrier, &the_carrier._request));
NAPI_CALL(env,
Expand Down Expand Up @@ -145,8 +145,8 @@ napi_value TestCancel(napi_env env, napi_callback_info info) {
napi_value resource_name;
void* data;

NAPI_CALL(env,
napi_create_string_utf8(env, "TestResource", -1, &resource_name));
NAPI_CALL(env, napi_create_string_utf8(
env, "TestResource", NAPI_AUTO_LENGTH, &resource_name));

// make sure the work we are going to cancel will not be
// able to start by using all the threads in the pool
Expand Down
2 changes: 1 addition & 1 deletion test/addons-napi/test_constructor/test_constructor.c
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Expand Up @@ -77,7 +77,7 @@ napi_value Init(napi_env env, napi_value exports) {
};

napi_value cons;
NAPI_CALL(env, napi_define_class(env, "MyObject", -1, New,
NAPI_CALL(env, napi_define_class(env, "MyObject", NAPI_AUTO_LENGTH, New,
NULL, sizeof(properties)/sizeof(*properties), properties, &cons));

NAPI_CALL(env, napi_create_reference(env, cons, 1, &constructor_));
Expand Down
3 changes: 2 additions & 1 deletion test/addons-napi/test_conversions/test_conversions.c
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Expand Up @@ -81,7 +81,8 @@ napi_value AsString(napi_env env, napi_callback_info info) {
napi_get_value_string_utf8(env, args[0], value, sizeof(value), NULL));

napi_value output;
NAPI_CALL(env, napi_create_string_utf8(env, value, -1, &output));
NAPI_CALL(env, napi_create_string_utf8(
env, value, NAPI_AUTO_LENGTH, &output));

return output;
}
Expand Down
3 changes: 2 additions & 1 deletion test/addons-napi/test_env_sharing/compare_env.c
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Expand Up @@ -15,7 +15,8 @@ napi_value compare(napi_env env, napi_callback_info info) {
}

napi_value Init(napi_env env, napi_value exports) {
NAPI_CALL(env, napi_create_function(env, "exports", -1, compare, NULL, &exports));
NAPI_CALL(env, napi_create_function(
env, "exports", NAPI_AUTO_LENGTH, compare, NULL, &exports));
return exports;
}

Expand Down
28 changes: 18 additions & 10 deletions test/addons-napi/test_error/test_error.cc
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Expand Up @@ -18,7 +18,8 @@ napi_value checkError(napi_env env, napi_callback_info info) {
napi_value throwExistingError(napi_env env, napi_callback_info info) {
napi_value message;
napi_value error;
NAPI_CALL(env, napi_create_string_utf8(env, "existing error", -1, &message));
NAPI_CALL(env, napi_create_string_utf8(
env, "existing error", NAPI_AUTO_LENGTH, &message));
NAPI_CALL(env, napi_create_error(env, nullptr, message, &error));
NAPI_CALL(env, napi_throw(env, error));
return nullptr;
Expand Down Expand Up @@ -62,23 +63,26 @@ napi_value throwTypeErrorCode(napi_env env, napi_callback_info info) {
napi_value createError(napi_env env, napi_callback_info info) {
napi_value result;
napi_value message;
NAPI_CALL(env, napi_create_string_utf8(env, "error", -1, &message));
NAPI_CALL(env, napi_create_string_utf8(
env, "error", NAPI_AUTO_LENGTH, &message));
NAPI_CALL(env, napi_create_error(env, nullptr, message, &result));
return result;
}

napi_value createRangeError(napi_env env, napi_callback_info info) {
napi_value result;
napi_value message;
NAPI_CALL(env, napi_create_string_utf8(env, "range error", -1, &message));
NAPI_CALL(env, napi_create_string_utf8(
env, "range error", NAPI_AUTO_LENGTH, &message));
NAPI_CALL(env, napi_create_range_error(env, nullptr, message, &result));
return result;
}

napi_value createTypeError(napi_env env, napi_callback_info info) {
napi_value result;
napi_value message;
NAPI_CALL(env, napi_create_string_utf8(env, "type error", -1, &message));
NAPI_CALL(env, napi_create_string_utf8(
env, "type error", NAPI_AUTO_LENGTH, &message));
NAPI_CALL(env, napi_create_type_error(env, nullptr, message, &result));
return result;
}
Expand All @@ -87,8 +91,10 @@ napi_value createErrorCode(napi_env env, napi_callback_info info) {
napi_value result;
napi_value message;
napi_value code;
NAPI_CALL(env, napi_create_string_utf8(env, "Error [error]", -1, &message));
NAPI_CALL(env, napi_create_string_utf8(env, "ERR_TEST_CODE", -1, &code));
NAPI_CALL(env, napi_create_string_utf8(
env, "Error [error]", NAPI_AUTO_LENGTH, &message));
NAPI_CALL(env, napi_create_string_utf8(
env, "ERR_TEST_CODE", NAPI_AUTO_LENGTH, &code));
NAPI_CALL(env, napi_create_error(env, code, message, &result));
return result;
}
Expand All @@ -99,9 +105,10 @@ napi_value createRangeErrorCode(napi_env env, napi_callback_info info) {
napi_value code;
NAPI_CALL(env, napi_create_string_utf8(env,
"RangeError [range error]",
-1,
NAPI_AUTO_LENGTH,
&message));
NAPI_CALL(env, napi_create_string_utf8(env, "ERR_TEST_CODE", -1, &code));
NAPI_CALL(env, napi_create_string_utf8(
env, "ERR_TEST_CODE", NAPI_AUTO_LENGTH, &code));
NAPI_CALL(env, napi_create_range_error(env, code, message, &result));
return result;
}
Expand All @@ -112,9 +119,10 @@ napi_value createTypeErrorCode(napi_env env, napi_callback_info info) {
napi_value code;
NAPI_CALL(env, napi_create_string_utf8(env,
"TypeError [type error]",
-1,
NAPI_AUTO_LENGTH,
&message));
NAPI_CALL(env, napi_create_string_utf8(env, "ERR_TEST_CODE", -1, &code));
NAPI_CALL(env, napi_create_string_utf8(
env, "ERR_TEST_CODE", NAPI_AUTO_LENGTH, &code));
NAPI_CALL(env, napi_create_type_error(env, code, message, &result));
return result;
}
Expand Down
3 changes: 2 additions & 1 deletion test/addons-napi/test_fatal/test_fatal.c
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Expand Up @@ -2,7 +2,8 @@
#include "../common.h"

napi_value Test(napi_env env, napi_callback_info info) {
napi_fatal_error("test_fatal::Test", -1, "fatal message", -1);
napi_fatal_error("test_fatal::Test", NAPI_AUTO_LENGTH,
"fatal message", NAPI_AUTO_LENGTH);
return NULL;
}

Expand Down
4 changes: 2 additions & 2 deletions test/addons-napi/test_function/test_function.c
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Expand Up @@ -33,11 +33,11 @@ napi_value TestFunctionName(napi_env env, napi_callback_info info) {
napi_value Init(napi_env env, napi_value exports) {
napi_value fn1;
NAPI_CALL(env, napi_create_function(
env, NULL, -1, TestCallFunction, NULL, &fn1));
env, NULL, NAPI_AUTO_LENGTH, TestCallFunction, NULL, &fn1));

napi_value fn2;
NAPI_CALL(env, napi_create_function(
env, "Name", -1, TestFunctionName, NULL, &fn2));
env, "Name", NAPI_AUTO_LENGTH, TestFunctionName, NULL, &fn2));

napi_value fn3;
NAPI_CALL(env, napi_create_function(
Expand Down
26 changes: 17 additions & 9 deletions test/addons-napi/test_general/test_general.c
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Expand Up @@ -43,7 +43,7 @@ napi_value testGetNodeVersion(napi_env env, napi_callback_info info) {
NAPI_CALL(env, napi_create_uint32(env, node_version->patch, &patch));
NAPI_CALL(env, napi_create_string_utf8(env,
node_version->release,
(size_t)-1,
NAPI_AUTO_LENGTH,
&release));
NAPI_CALL(env, napi_create_array_with_length(env, 4, &result));
NAPI_CALL(env, napi_set_element(env, result, 0, major));
Expand Down Expand Up @@ -120,21 +120,29 @@ napi_value testNapiTypeof(napi_env env, napi_callback_info info) {

napi_value result = NULL;
if (argument_type == napi_number) {
NAPI_CALL(env, napi_create_string_utf8(env, "number", -1, &result));
NAPI_CALL(env, napi_create_string_utf8(
env, "number", NAPI_AUTO_LENGTH, &result));
} else if (argument_type == napi_string) {
NAPI_CALL(env, napi_create_string_utf8(env, "string", -1, &result));
NAPI_CALL(env, napi_create_string_utf8(
env, "string", NAPI_AUTO_LENGTH, &result));
} else if (argument_type == napi_function) {
NAPI_CALL(env, napi_create_string_utf8(env, "function", -1, &result));
NAPI_CALL(env, napi_create_string_utf8(
env, "function", NAPI_AUTO_LENGTH, &result));
} else if (argument_type == napi_object) {
NAPI_CALL(env, napi_create_string_utf8(env, "object", -1, &result));
NAPI_CALL(env, napi_create_string_utf8(
env, "object", NAPI_AUTO_LENGTH, &result));
} else if (argument_type == napi_boolean) {
NAPI_CALL(env, napi_create_string_utf8(env, "boolean", -1, &result));
NAPI_CALL(env, napi_create_string_utf8(
env, "boolean", NAPI_AUTO_LENGTH, &result));
} else if (argument_type == napi_undefined) {
NAPI_CALL(env, napi_create_string_utf8(env, "undefined", -1, &result));
NAPI_CALL(env, napi_create_string_utf8(
env, "undefined", NAPI_AUTO_LENGTH, &result));
} else if (argument_type == napi_symbol) {
NAPI_CALL(env, napi_create_string_utf8(env, "symbol", -1, &result));
NAPI_CALL(env, napi_create_string_utf8(
env, "symbol", NAPI_AUTO_LENGTH, &result));
} else if (argument_type == napi_null) {
NAPI_CALL(env, napi_create_string_utf8(env, "null", -1, &result));
NAPI_CALL(env, napi_create_string_utf8(
env, "null", NAPI_AUTO_LENGTH, &result));
}
return result;
}
Expand Down
6 changes: 4 additions & 2 deletions test/addons-napi/test_make_callback/binding.cc
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Expand Up @@ -25,7 +25,8 @@ napi_value MakeCallback(napi_env env, napi_callback_info info) {
NAPI_CALL(env, napi_typeof(env, func, &func_type));

napi_value resource_name;
NAPI_CALL(env, napi_create_string_utf8(env, "test", -1, &resource_name));
NAPI_CALL(env, napi_create_string_utf8(
env, "test", NAPI_AUTO_LENGTH, &resource_name));

napi_async_context context;
NAPI_CALL(env, napi_async_init(env, func, resource_name, &context));
Expand All @@ -45,7 +46,8 @@ napi_value MakeCallback(napi_env env, napi_callback_info info) {

napi_value Init(napi_env env, napi_value exports) {
napi_value fn;
NAPI_CALL(env, napi_create_function(env, NULL, -1, MakeCallback, NULL, &fn));
NAPI_CALL(env, napi_create_function(
env, NULL, NAPI_AUTO_LENGTH, MakeCallback, NULL, &fn));
NAPI_CALL(env, napi_set_named_property(env, exports, "makeCallback", fn));
return exports;
}
Expand Down
3 changes: 2 additions & 1 deletion test/addons-napi/test_make_callback_recurse/binding.cc
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Expand Up @@ -20,7 +20,8 @@ napi_value MakeCallback(napi_env env, napi_callback_info info) {

napi_value Init(napi_env env, napi_value exports) {
napi_value fn;
NAPI_CALL(env, napi_create_function(env, NULL, -1, MakeCallback, NULL, &fn));
NAPI_CALL(env, napi_create_function(
env, NULL, NAPI_AUTO_LENGTH, MakeCallback, NULL, &fn));
NAPI_CALL(env, napi_set_named_property(env, exports, "makeCallback", fn));
return exports;
}
Expand Down
4 changes: 2 additions & 2 deletions test/addons-napi/test_properties/test_properties.c
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Expand Up @@ -66,14 +66,14 @@ napi_value Init(napi_env env, napi_value exports) {
napi_value name_value;
NAPI_CALL(env, napi_create_string_utf8(env,
"NameKeyValue",
-1,
NAPI_AUTO_LENGTH,
&name_value));

napi_value symbol_description;
napi_value name_symbol;
NAPI_CALL(env, napi_create_string_utf8(env,
"NameKeySymbol",
-1,
NAPI_AUTO_LENGTH,
&symbol_description));
NAPI_CALL(env, napi_create_symbol(env,
symbol_description,
Expand Down