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src: fix compile warnings in node_url.cc #31689

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@addaleax addaleax commented Feb 7, 2020

Since for all affected conversions there is a preceding type check,
it’s safe to use .FromJust() instead.

This fixes the following compile warnings:

../src/node_url.cc: In function ‘void node::url::{anonymous}::ToUSVString(const v8::FunctionCallbackInfo<v8::Value>&)’:
../src/node_url.cc:2242:43: warning: ignoring return value of ‘bool v8::Maybe<T>::To(T*) const [with T = long int]’, declared with attribute warn_unused_result [-Wunused-result]
 2242 |   args[1]->IntegerValue(env->context()).To(&start);
      |   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
../src/node_url.cc: In function ‘node::url::url_data node::url::{anonymous}::HarvestBase(node::Environment*, v8::Local<v8::Object>)’:
../src/node_url.cc:1206:34: warning: ignoring return value of ‘bool v8::Maybe<T>::To(T*) const [with T = int]’, declared with attribute warn_unused_result [-Wunused-result]
 1206 |     flags->Int32Value(context).To(&base.flags);
      |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
../src/node_url.cc:1211:33: warning: ignoring return value of ‘bool v8::Maybe<T>::To(T*) const [with T = int]’, declared with attribute warn_unused_result [-Wunused-result]
 1211 |     port->Int32Value(context).To(&base.port);
      |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
../src/node_url.cc: In function ‘void node::url::{anonymous}::ToUSVString(const v8::FunctionCallbackInfo<v8::Value>&)’:
../src/node_url.cc:2245:15: warning: ‘start’ may be used uninitialized in this function [-Wmaybe-uninitialized]
 2245 |   for (size_t i = start; i < value.length(); i++) {
      |               ^
Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • commit message follows commit guidelines

Since for all affected conversions there is a preceding type check,
it’s safe to use `.FromJust()` instead.

This fixes the following compile warnings:

    ../src/node_url.cc: In function ‘void node::url::{anonymous}::ToUSVString(const v8::FunctionCallbackInfo<v8::Value>&)’:
    ../src/node_url.cc:2242:43: warning: ignoring return value of ‘bool v8::Maybe<T>::To(T*) const [with T = long int]’, declared with attribute warn_unused_result [-Wunused-result]
     2242 |   args[1]->IntegerValue(env->context()).To(&start);
          |   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
    ../src/node_url.cc: In function ‘node::url::url_data node::url::{anonymous}::HarvestBase(node::Environment*, v8::Local<v8::Object>)’:
    ../src/node_url.cc:1206:34: warning: ignoring return value of ‘bool v8::Maybe<T>::To(T*) const [with T = int]’, declared with attribute warn_unused_result [-Wunused-result]
     1206 |     flags->Int32Value(context).To(&base.flags);
          |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
    ../src/node_url.cc:1211:33: warning: ignoring return value of ‘bool v8::Maybe<T>::To(T*) const [with T = int]’, declared with attribute warn_unused_result [-Wunused-result]
     1211 |     port->Int32Value(context).To(&base.port);
          |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
    ../src/node_url.cc: In function ‘void node::url::{anonymous}::ToUSVString(const v8::FunctionCallbackInfo<v8::Value>&)’:
    ../src/node_url.cc:2245:15: warning: ‘start’ may be used uninitialized in this function [-Wmaybe-uninitialized]
     2245 |   for (size_t i = start; i < value.length(); i++) {
          |               ^
@nodejs-github-bot nodejs-github-bot added the c++ Issues and PRs that require attention from people who are familiar with C++. label Feb 7, 2020
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jasnell commented Feb 8, 2020

Ugh so irritating these aren't reported when building on Windows.

@BridgeAR BridgeAR added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Feb 9, 2020
addaleax added a commit that referenced this pull request Feb 10, 2020
Since for all affected conversions there is a preceding type check,
it’s safe to use `.FromJust()` instead.

This fixes the following compile warnings:

    ../src/node_url.cc: In function ‘void node::url::{anonymous}::ToUSVString(const v8::FunctionCallbackInfo<v8::Value>&)’:
    ../src/node_url.cc:2242:43: warning: ignoring return value of ‘bool v8::Maybe<T>::To(T*) const [with T = long int]’, declared with attribute warn_unused_result [-Wunused-result]
     2242 |   args[1]->IntegerValue(env->context()).To(&start);
          |   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
    ../src/node_url.cc: In function ‘node::url::url_data node::url::{anonymous}::HarvestBase(node::Environment*, v8::Local<v8::Object>)’:
    ../src/node_url.cc:1206:34: warning: ignoring return value of ‘bool v8::Maybe<T>::To(T*) const [with T = int]’, declared with attribute warn_unused_result [-Wunused-result]
     1206 |     flags->Int32Value(context).To(&base.flags);
          |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
    ../src/node_url.cc:1211:33: warning: ignoring return value of ‘bool v8::Maybe<T>::To(T*) const [with T = int]’, declared with attribute warn_unused_result [-Wunused-result]
     1211 |     port->Int32Value(context).To(&base.port);
          |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
    ../src/node_url.cc: In function ‘void node::url::{anonymous}::ToUSVString(const v8::FunctionCallbackInfo<v8::Value>&)’:
    ../src/node_url.cc:2245:15: warning: ‘start’ may be used uninitialized in this function [-Wmaybe-uninitialized]
     2245 |   for (size_t i = start; i < value.length(); i++) {
          |               ^

PR-URL: #31689
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
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Landed in 2b1c18f

@addaleax addaleax closed this Feb 10, 2020
@addaleax addaleax deleted the url-compile-warnings branch February 10, 2020 14:43
codebytere pushed a commit that referenced this pull request Feb 17, 2020
Since for all affected conversions there is a preceding type check,
it’s safe to use `.FromJust()` instead.

This fixes the following compile warnings:

    ../src/node_url.cc: In function ‘void node::url::{anonymous}::ToUSVString(const v8::FunctionCallbackInfo<v8::Value>&)’:
    ../src/node_url.cc:2242:43: warning: ignoring return value of ‘bool v8::Maybe<T>::To(T*) const [with T = long int]’, declared with attribute warn_unused_result [-Wunused-result]
     2242 |   args[1]->IntegerValue(env->context()).To(&start);
          |   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
    ../src/node_url.cc: In function ‘node::url::url_data node::url::{anonymous}::HarvestBase(node::Environment*, v8::Local<v8::Object>)’:
    ../src/node_url.cc:1206:34: warning: ignoring return value of ‘bool v8::Maybe<T>::To(T*) const [with T = int]’, declared with attribute warn_unused_result [-Wunused-result]
     1206 |     flags->Int32Value(context).To(&base.flags);
          |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
    ../src/node_url.cc:1211:33: warning: ignoring return value of ‘bool v8::Maybe<T>::To(T*) const [with T = int]’, declared with attribute warn_unused_result [-Wunused-result]
     1211 |     port->Int32Value(context).To(&base.port);
          |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
    ../src/node_url.cc: In function ‘void node::url::{anonymous}::ToUSVString(const v8::FunctionCallbackInfo<v8::Value>&)’:
    ../src/node_url.cc:2245:15: warning: ‘start’ may be used uninitialized in this function [-Wmaybe-uninitialized]
     2245 |   for (size_t i = start; i < value.length(); i++) {
          |               ^

PR-URL: #31689
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
@codebytere codebytere mentioned this pull request Feb 17, 2020
codebytere pushed a commit that referenced this pull request Mar 15, 2020
Since for all affected conversions there is a preceding type check,
it’s safe to use `.FromJust()` instead.

This fixes the following compile warnings:

    ../src/node_url.cc: In function ‘void node::url::{anonymous}::ToUSVString(const v8::FunctionCallbackInfo<v8::Value>&)’:
    ../src/node_url.cc:2242:43: warning: ignoring return value of ‘bool v8::Maybe<T>::To(T*) const [with T = long int]’, declared with attribute warn_unused_result [-Wunused-result]
     2242 |   args[1]->IntegerValue(env->context()).To(&start);
          |   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
    ../src/node_url.cc: In function ‘node::url::url_data node::url::{anonymous}::HarvestBase(node::Environment*, v8::Local<v8::Object>)’:
    ../src/node_url.cc:1206:34: warning: ignoring return value of ‘bool v8::Maybe<T>::To(T*) const [with T = int]’, declared with attribute warn_unused_result [-Wunused-result]
     1206 |     flags->Int32Value(context).To(&base.flags);
          |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
    ../src/node_url.cc:1211:33: warning: ignoring return value of ‘bool v8::Maybe<T>::To(T*) const [with T = int]’, declared with attribute warn_unused_result [-Wunused-result]
     1211 |     port->Int32Value(context).To(&base.port);
          |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
    ../src/node_url.cc: In function ‘void node::url::{anonymous}::ToUSVString(const v8::FunctionCallbackInfo<v8::Value>&)’:
    ../src/node_url.cc:2245:15: warning: ‘start’ may be used uninitialized in this function [-Wmaybe-uninitialized]
     2245 |   for (size_t i = start; i < value.length(); i++) {
          |               ^

PR-URL: #31689
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
codebytere pushed a commit that referenced this pull request Mar 17, 2020
Since for all affected conversions there is a preceding type check,
it’s safe to use `.FromJust()` instead.

This fixes the following compile warnings:

    ../src/node_url.cc: In function ‘void node::url::{anonymous}::ToUSVString(const v8::FunctionCallbackInfo<v8::Value>&)’:
    ../src/node_url.cc:2242:43: warning: ignoring return value of ‘bool v8::Maybe<T>::To(T*) const [with T = long int]’, declared with attribute warn_unused_result [-Wunused-result]
     2242 |   args[1]->IntegerValue(env->context()).To(&start);
          |   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
    ../src/node_url.cc: In function ‘node::url::url_data node::url::{anonymous}::HarvestBase(node::Environment*, v8::Local<v8::Object>)’:
    ../src/node_url.cc:1206:34: warning: ignoring return value of ‘bool v8::Maybe<T>::To(T*) const [with T = int]’, declared with attribute warn_unused_result [-Wunused-result]
     1206 |     flags->Int32Value(context).To(&base.flags);
          |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
    ../src/node_url.cc:1211:33: warning: ignoring return value of ‘bool v8::Maybe<T>::To(T*) const [with T = int]’, declared with attribute warn_unused_result [-Wunused-result]
     1211 |     port->Int32Value(context).To(&base.port);
          |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
    ../src/node_url.cc: In function ‘void node::url::{anonymous}::ToUSVString(const v8::FunctionCallbackInfo<v8::Value>&)’:
    ../src/node_url.cc:2245:15: warning: ‘start’ may be used uninitialized in this function [-Wmaybe-uninitialized]
     2245 |   for (size_t i = start; i < value.length(); i++) {
          |               ^

PR-URL: #31689
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
@codebytere codebytere mentioned this pull request Mar 17, 2020
codebytere pushed a commit that referenced this pull request Mar 30, 2020
Since for all affected conversions there is a preceding type check,
it’s safe to use `.FromJust()` instead.

This fixes the following compile warnings:

    ../src/node_url.cc: In function ‘void node::url::{anonymous}::ToUSVString(const v8::FunctionCallbackInfo<v8::Value>&)’:
    ../src/node_url.cc:2242:43: warning: ignoring return value of ‘bool v8::Maybe<T>::To(T*) const [with T = long int]’, declared with attribute warn_unused_result [-Wunused-result]
     2242 |   args[1]->IntegerValue(env->context()).To(&start);
          |   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
    ../src/node_url.cc: In function ‘node::url::url_data node::url::{anonymous}::HarvestBase(node::Environment*, v8::Local<v8::Object>)’:
    ../src/node_url.cc:1206:34: warning: ignoring return value of ‘bool v8::Maybe<T>::To(T*) const [with T = int]’, declared with attribute warn_unused_result [-Wunused-result]
     1206 |     flags->Int32Value(context).To(&base.flags);
          |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
    ../src/node_url.cc:1211:33: warning: ignoring return value of ‘bool v8::Maybe<T>::To(T*) const [with T = int]’, declared with attribute warn_unused_result [-Wunused-result]
     1211 |     port->Int32Value(context).To(&base.port);
          |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
    ../src/node_url.cc: In function ‘void node::url::{anonymous}::ToUSVString(const v8::FunctionCallbackInfo<v8::Value>&)’:
    ../src/node_url.cc:2245:15: warning: ‘start’ may be used uninitialized in this function [-Wmaybe-uninitialized]
     2245 |   for (size_t i = start; i < value.length(); i++) {
          |               ^

PR-URL: #31689
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
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