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fix: don't unsafely clone env

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was safe but better no unsafe at all
This commit is contained in:
əlemi 2024-09-24 03:14:45 +02:00
parent ef9237b74a
commit a7c0b6881e
Signed by: alemi
GPG key ID: A4895B84D311642C
1 changed files with 22 additions and 21 deletions
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43
macro/src/wrapper.rs
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@ -1,12 +1,9 @@
use proc_macro2::{Span, TokenStream}; use proc_macro2::{Span, TokenStream};
use quote::TokenStreamExt;
use syn::Item; use syn::Item;
use crate::{args::ArgumentOptions, attrs::AttrsOptions, ret::ReturnOptions}; use crate::{args::ArgumentOptions, attrs::AttrsOptions, ret::ReturnOptions};
pub(crate) fn generate_jni_wrapper(attrs: TokenStream, input: TokenStream) -> Result<TokenStream, syn::Error> { pub(crate) fn generate_jni_wrapper(attrs: TokenStream, input: TokenStream) -> Result<TokenStream, syn::Error> {
let mut out = TokenStream::new();
let Item::Fn(fn_item) = syn::parse2(input.clone())? else { let Item::Fn(fn_item) = syn::parse2(input.clone())? else {
return Err(syn::Error::new(Span::call_site(), "#[jni] is only supported on functions")); return Err(syn::Error::new(Span::call_site(), "#[jni] is only supported on functions"));
}; };
@ -47,10 +44,9 @@ pub(crate) fn generate_jni_wrapper(attrs: TokenStream, input: TokenStream) -> Re
}; };
let env_ident = args.env; let env_iden = args.env;
let forwarding = args.forwarding; let forwarding = args.forwarding;
let invocation = quote::quote! { let invocation = quote::quote! {
let mut env_copy = unsafe { #env_ident.unsafe_clone() };
let result = #fn_name_inner(#forwarding); let result = #fn_name_inner(#forwarding);
}; };
@ -60,7 +56,7 @@ pub(crate) fn generate_jni_wrapper(attrs: TokenStream, input: TokenStream) -> Re
quote::quote! { quote::quote! {
let ret = match result { let ret = match result {
Ok(x) => x, Ok(x) => x,
Err(e) => match env_copy.throw_new(#exception, format!("{e:?}")) { Err(e) => match #env_iden.throw_new(#exception, format!("{e:?}")) {
Ok(_) => return #return_expr, Ok(_) => return #return_expr,
Err(e) => panic!("error throwing java exception: {e}"), Err(e) => panic!("error throwing java exception: {e}"),
} }
@ -70,13 +66,13 @@ pub(crate) fn generate_jni_wrapper(attrs: TokenStream, input: TokenStream) -> Re
quote::quote! { quote::quote! {
let ret = match result { let ret = match result {
Ok(x) => x, Ok(x) => x,
Err(e) => match env_copy.find_class(e.jclass()) { Err(e) => match #env_iden.find_class(e.jclass()) {
Err(e) => panic!("error throwing Java exception -- failed resolving error class: {e}"), Err(e) => panic!("error throwing Java exception -- failed resolving error class: {e}"),
Ok(class) => match env_copy.new_string(format!("{e:?}")) { Ok(class) => match #env_iden.new_string(format!("{e:?}")) {
Err(e) => panic!("error throwing Java exception -- failed creating error string: {e}"), Err(e) => panic!("error throwing Java exception -- failed creating error string: {e}"),
Ok(msg) => match env_copy.new_object(class, "(Ljava/lang/String;)V", &[jni::objects::JValueGen::Object(&msg)]) { Ok(msg) => match #env_iden.new_object(class, "(Ljava/lang/String;)V", &[jni::objects::JValueGen::Object(&msg)]) {
Err(e) => panic!("error throwing Java exception -- failed creating object: {e}"), Err(e) => panic!("error throwing Java exception -- failed creating object: {e}"),
Ok(obj) => match env_copy.throw(jni::objects::JThrowable::from(obj)) { Ok(obj) => match #env_iden.throw(jni::objects::JThrowable::from(obj)) {
Err(e) => panic!("error throwing Java exception -- failed throwing: {e}"), Err(e) => panic!("error throwing Java exception -- failed throwing: {e}"),
Ok(_) => return #return_expr, Ok(_) => return #return_expr,
}, },
@ -92,18 +88,28 @@ pub(crate) fn generate_jni_wrapper(attrs: TokenStream, input: TokenStream) -> Re
let reverse_transformations = quote::quote! { let reverse_transformations = quote::quote! {
match ret.into_java(&mut env_copy) { match ret.into_java(&mut #env_iden) {
Ok(fin) => fin, Ok(fin) => fin,
Err(e) => { Err(e) => {
// TODO should we panic instead? // TODO should we panic instead?
let _ = env_copy.throw_new("java/lang/RuntimeException", format!("{e:?}")); let _ = #env_iden.throw_new("java/lang/RuntimeException", format!("{e:?}"));
#return_expr #return_expr
} }
} }
}; };
let body = quote::quote! { let inline_macro = if attrs.inline {
{ quote::quote!(#[inline])
} else {
quote::quote!()
};
Ok(quote::quote! {
#inline_macro
#input
#header {
#transformations #transformations
#invocation #invocation
@ -111,12 +117,7 @@ pub(crate) fn generate_jni_wrapper(attrs: TokenStream, input: TokenStream) -> Re
#error_handling #error_handling
#reverse_transformations #reverse_transformations
} }
}; })
out.append_all(input);
out.append_all(header);
out.append_all(body);
Ok(out)
} }