rustdoc --output-format json command seems broken #25108

GuillaumeGomez · 2015-05-04T21:47:56Z

I tried this command:

> rustdoc --output-format json src/sysinfo.rs

On this repo.

Result:

src/sysinfo.rs:13:1: 13:19 error: use of unstable library feature 'libc'
src/sysinfo.rs:13 extern crate libc;
                  ^~~~~~~~~~~~~~~~~~
src/sysinfo.rs:13:1: 13:19 help: add #![feature(libc)] to the crate attributes to enable
src/processus.rs:43:42: 43:47 error: use of unstable library feature 'libc'
src/processus.rs:43         unsafe { ::ffi::kill(self.pid as c_int, signal as c_int) == 0 }
                                                             ^~~~~
src/processus.rs:43:42: 43:47 help: add #![feature(libc)] to the crate attributes to enable
src/processus.rs:43:59: 43:64 error: use of unstable library feature 'libc'
src/processus.rs:43         unsafe { ::ffi::kill(self.pid as c_int, signal as c_int) == 0 }
                                                                              ^~~~~
src/processus.rs:43:59: 43:64 help: add #![feature(libc)] to the crate attributes to enable
src/system.rs:15:5: 15:41 error: use of unstable library feature 'libc'
src/system.rs:15 use libc::types::os::arch::posix01::stat;
                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/system.rs:15:5: 15:41 help: add #![feature(libc)] to the crate attributes to enable
src/system.rs:16:5: 16:17 error: use of unstable library feature 'libc'
src/system.rs:16 use libc::c_char;
                     ^~~~~~~~~~~~
src/system.rs:16:5: 16:17 help: add #![feature(libc)] to the crate attributes to enable
src/system.rs:17:5: 17:39 error: use of unstable library feature 'libc'
src/system.rs:17 use libc::funcs::posix01::stat_::lstat;
                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/system.rs:17:5: 17:39 help: add #![feature(libc)] to the crate attributes to enable
src/system.rs:279:35: 279:39 error: use of unstable library feature 'libc'
src/system.rs:279                     let mut buf : stat = unsafe { ::std::mem::uninitialized() };
                                                    ^~~~
src/system.rs:279:35: 279:39 help: add #![feature(libc)] to the crate attributes to enable
src/system.rs:280:90: 280:96 error: use of unstable library feature 'libc'
src/system.rs:280                     let res = unsafe { lstat(result.to_str().unwrap().as_ptr() as *const c_char, &mut buf as *mut stat) };
                                                                                                           ^~~~~~
src/system.rs:280:90: 280:96 help: add #![feature(libc)] to the crate attributes to enable
src/system.rs:280:115: 280:119 error: use of unstable library feature 'libc'
src/system.rs:280                     let res = unsafe { lstat(result.to_str().unwrap().as_ptr() as *const c_char, &mut buf as *mut stat) };
                                                                                                                                    ^~~~
src/system.rs:280:115: 280:119 help: add #![feature(libc)] to the crate attributes to enable
src/system.rs:280:40: 280:45 error: use of unstable library feature 'libc'
src/system.rs:280                     let res = unsafe { lstat(result.to_str().unwrap().as_ptr() as *const c_char, &mut buf as *mut stat) };
                                                         ^~~~~
src/system.rs:280:40: 280:45 help: add #![feature(libc)] to the crate attributes to enable
src/system.rs:282:40: 282:47 error: use of unstable library feature 'libc'
src/system.rs:282                     if res < 0 || (buf.st_mode  & S_IFMT) != S_IFLNK {
                                                         ^~~~~~~
src/system.rs:282:40: 282:47 help: add #![feature(libc)] to the crate attributes to enable
src/system.rs:282:51: 282:57 error: use of unstable library feature 'libc'
src/system.rs:282                     if res < 0 || (buf.st_mode  & S_IFMT) != S_IFLNK {
                                                                    ^~~~~~
src/system.rs:282:51: 282:57 help: add #![feature(libc)] to the crate attributes to enable
src/system.rs:282:62: 282:69 error: use of unstable library feature 'libc'
src/system.rs:282                     if res < 0 || (buf.st_mode  & S_IFMT) != S_IFLNK {
                                                                               ^~~~~~~
src/system.rs:282:62: 282:69 help: add #![feature(libc)] to the crate attributes to enable
src/ffi.rs:10:19: 10:24 error: use of unstable library feature 'libc'
src/ffi.rs:10   pub fn kill(pid: c_int, signal: c_int) -> c_int;
                                 ^~~~~
src/ffi.rs:10:19: 10:24 help: add #![feature(libc)] to the crate attributes to enable
src/ffi.rs:10:34: 10:39 error: use of unstable library feature 'libc'
src/ffi.rs:10   pub fn kill(pid: c_int, signal: c_int) -> c_int;
                                                ^~~~~
src/ffi.rs:10:34: 10:39 help: add #![feature(libc)] to the crate attributes to enable
src/ffi.rs:10:44: 10:49 error: use of unstable library feature 'libc'
src/ffi.rs:10   pub fn kill(pid: c_int, signal: c_int) -> c_int;
                                                          ^~~~~
src/ffi.rs:10:44: 10:49 help: add #![feature(libc)] to the crate attributes to enable
error: aborting due to 16 previous errors
thread '<unnamed>' panicked at 'Box<Any>', /home/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libsyntax/diagnostic.rs:192
thread '<unnamed>' panicked at 'called `Result::unwrap()` on an `Err` value: "rustc failed"', /home/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/result.rs:729
thread '<main>' panicked at 'called `Result::unwrap()` on an `Err` value: Any', /home/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/result.rs:729

So then I added the "missing" feature (that's weird by the way) and then I got:

> rustdoc --output-format json src/sysinfo.rs 
thread '<unnamed>' panicked at 'Rust generated JSON is invalid: SyntaxError(EOFWhileParsingObject, 1, 99690)', /home/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/librustdoc/lib.rs:525
thread '<main>' panicked at 'called `Result::unwrap()` on an `Err` value: Any', /home/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/result.rs:729

I guess rustdoc is broken somehow ? Here's my current rustdoc version:

> rustdoc --version
rustdoc 1.1.0-nightly (ce1150b9f 2015-05-04) (built 2015-05-04)

retep998 · 2015-05-08T22:17:51Z

That part about libc isn't weird, because normally when you invoke cargo doc it passes in all the dependency information, including the external libc. But when you invoked rustdoc manually you didn't include that dependency information, this the only libc it knew about was the internal one which is unstable.

GuillaumeGomez · 2015-05-08T22:31:08Z

So how am I supposed to test it ? Or just make it work ?

retep998 · 2015-05-09T00:10:55Z

Do cargo doc --verbose to get the exact command that Cargo uses to invoke rustdoc, and then modify that command to add the --output-format json bit.

GuillaumeGomez · 2015-05-09T00:16:28Z

It uses rustc and not rustdoc, I'll have to find what the equivalent of --output-format json is. Thanks for your help.

GuillaumeGomez · 2015-05-09T00:19:56Z

Never mind, I'm just getting really tired... Here is what I get :

> rustdoc src/sysinfo.rs --crate-name sysinfo -o /home/imperio/rust/sysinfo/target/doc -L dependency=/home/imperio/rust/sysinfo/target/debug -L dependency=/home/imperio/rust/sysinfo/target/debug/deps --extern libc=/home/imperio/rust/sysinfo/target/debug/deps/liblibc-9b7976990ae0dbd4.rlib --extern libc=/home/imperio/rust/sysinfo/target/debug/deps/liblibc-9b7976990ae0dbd4.rlib --output-format json
thread '<unnamed>' panicked at 'Rust generated JSON is invalid: SyntaxError(EOFWhileParsingObject, 1, 105198)', /home/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/librustdoc/lib.rs:525
thread '<main>' panicked at 'called `Result::unwrap()` on an `Err` value: Any', /home/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/result.rs:729

If I'm not wrong, that's the same error...

bltavares · 2016-01-05T18:49:03Z

Triaging:

Still happening on rustdoc 1.7.0-nightly (8f11a9ef4 2016-01-03)

bltavares · 2016-01-06T16:18:04Z

I was able to reduce it to this point on the rustdoc.

rust/src/librustdoc/lib.rs

Line 518 in d5ac1a1

let crate_json_str = format!("{}", json::as_json(&krate));

The generated json is prematurely ending after opening the external_crates property

{"name":"sysinfo","src":"src/sysinfo.rs","module":{"source":{"filename":"src/sysinfo.rs","loline":7,"locol":0,"hiline":92,"hicol":0},"name":"","attrs":[{"variant":"NameValue","fields":["crate_name","sysinfo"]},{"variant":"NameValue","fields":["crate_type","lib"]},{"variant":"NameValue","fields":["crate_type","rlib"]},{"variant":"List","fields":["feature",[{"variant":"Word","fields":["libc"]}]]}],"inner":{"variant":"ModuleItem","fields":[{"items":[{"source":{"filename":"src/sysinfo.rs","loline":14,"locol":0,"hiline":14,"hicol":31},"name":null,"attrs":[],"inner":{"variant":"ImportItem","fields":[{"variant":"SimpleImport","fields":["Process",{"path":{"global":false,"segments":[{"name":"self","params":{"variant":"AngleBracketed","fields":[[],[],[]]}},{"name":"process","params":{"variant":"AngleBracketed","fields":[[],[],[]]}},{"name":"Process","params":{"variant":"AngleBracketed","fields":[[],[],[]]}}]},"did":{"krate":0,"index":{"_field0":12}}}]}]},"visibility":"Public","def_id":{"krate":0,"index":{"_field0":0}},"stability":null},{"source":{"filename":"src/sysinfo.rs","loline":15,"locol":0,"hiline":15,"hicol":35},"name":null,"attrs":[],"inner":{"variant":"ImportItem","fields":[{"variant":"SimpleImport","fields":["Processor",{"path":{"global":false,"segments":[{"name":"self","params":{"variant":"AngleBracketed","fields":[[],[],[]]}},{"name":"processor","params":{"variant":"AngleBracketed","fields":[[],[],[]]}},{"name":"Processor","params":{"variant":"AngleBracketed","fields":[[],[],[]]}}]},"did":{"krate":0,"index":{"_field0":148}}}]}]},"visibility":"Public","def_id":{"krate":0,"index":{"_field0":0}},"stability":null},{"source":{"filename":"src/sysinfo.rs","loline":16,"locol":0,"hiline":16,"hicol":24},"name":null,"attrs":[],"inner":{"variant":"ImportItem","fields":[{"variant":"GlobImport","fields":[{"path":{"global":false,"segments":[{"name":"self","params":{"variant":"AngleBracketed","fields":[[],[],[]]}},{"name":"system","params":{"variant":"AngleBracketed","fields":[[],[],[]]}}]},"did":{"krate":0,"index":{"_field0":219}}}]}]},"visibility":"Public","def_id":{"krate":0,"index":{"_field0":0}},"stability":null},{"source":{"filename":"src/sysinfo.rs","loline":25,"locol":0,"hiline":92,"hicol":1},"name":"Signal","attrs":[{"variant":"List","fields":["repr",[{"variant":"Word","fields":["C"]}]]}],"inner":{"variant":"EnumItem","fields":[{"variants":[{"source":{"filename":"src/sysinfo.rs","loline":27,"locol":1,"hiline":27,"hicol":11},"name":"Hangup","attrs":[{"variant":"NameValue","fields":["doc","Hangup 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Clicking on interesting things should"]},{"variant":"NameValue","fields":["doc"," generally lead you to interesting places. Still, there are important bits"]},{"variant":"NameValue","fields":["doc"," you don't want to miss, so read on for a tour of the standard library and"]},{"variant":"NameValue","fields":["doc"," its documentation!"]},{"variant":"NameValue","fields":["doc",""]},{"variant":"NameValue","fields":["doc"," Once you are familiar with the contents of the standard library you may"]},{"variant":"NameValue","fields":["doc"," begin to find the verbosity of the prose distracting. At this stage in your"]},{"variant":"NameValue","fields":["doc"," development you may want to press the **[-]** button near the top of the"]},{"variant":"NameValue","fields":["doc"," page to collapse it into a more skimmable view."]},{"variant":"NameValue","fields":["doc",""]},{"variant":"NameValue","fields":["doc"," While you are looking at that **[-]** button also notice the **[src]**"]},{"variant":"NameValue","fields":["doc"," button. Rust's API documentation comes with the source code and you are"]},{"variant":"NameValue","fields":["doc"," encouraged to read it. The standard library source is generally high"]},{"variant":"NameValue","fields":["doc"," quality and a peek behind the curtains is often enlightening."]},{"variant":"NameValue","fields":["doc",""]},{"variant":"NameValue","fields":["doc"," # What is in the standard library documentation?"]},{"variant":"NameValue","fields":["doc",""]},{"variant":"NameValue","fields":["doc"," First of all, The Rust Standard Library is divided into a number of focused"]},{"variant":"NameValue","fields":["doc"," modules, [all listed further down this page](#modules). These modules are"]},{"variant":"NameValue","fields":["doc"," the bedrock upon which all of Rust is forged, and they have mighty names"]},{"variant":"NameValue","fields":["doc"," like [`std::slice`] and [`std::cmp`]. Modules' documentation typically"]},{"variant":"NameValue","fields":["doc"," includes an overview of the module along with examples, and are a smart"]},{"variant":"NameValue","fields":["doc"," place to start familiarizing yourself with the library."]},{"variant":"NameValue","fields":["doc",""]},{"variant":"NameValue","fields":["doc"," Second, implicit methods on [primitive types] are documented here. This can"]},{"variant":"NameValue","fields":["doc"," be a source of confusion for two reasons:"]},{"variant":"NameValue","fields":["doc",""]},{"variant":"NameValue","fields":["doc"," 1. While primitives are implemented by the compiler, the standard library"]},{"variant":"NameValue","fields":["doc","    implements methods directly on the primitive types (and it is the only"]},{"variant":"NameValue","fields":["doc","    library that does so), which are [documented in the section on"]},{"variant":"NameValue","fields":["doc","    primitives](#primitives)."]},{"variant":"NameValue","fields":["doc"," 2. The standard library exports many modules *with the same name as"]},{"variant":"NameValue","fields":["doc","    primitive types*. These define additional items related to the primitive"]},{"variant":"NameValue","fields":["doc","    type, but not the all-important methods."]},{"variant":"NameValue","fields":["doc",""]},{"variant":"NameValue","fields":["doc"," So for example there is a [page for the primitive type"]},{"variant":"NameValue","fields":["doc"," `i32`](primitive.i32.html) that lists all the methods that can be called on"]},{"variant":"NameValue","fields":["doc"," 32-bit integers (very useful), and there is a [page for the module"]},{"variant":"NameValue","fields":["doc"," `std::i32`](i32/index.html) that documents the constant values [`MIN`] and"]},{"variant":"NameValue","fields":["doc"," [`MAX`](i32/constant.MAX.html) (rarely useful)."]},{"variant":"NameValue","fields":["doc",""]},{"variant":"NameValue","fields":["doc"," Note the documentation for the primitives [`str`] and [`[T]`][slice] (also"]},{"variant":"NameValue","fields":["doc"," called 'slice'). Many method calls on [`String`] and [`Vec<T>`] are actually"]},{"variant":"NameValue","fields":["doc"," calls to methods on [`str`] and [`[T]`][slice] respectively, via [deref"]},{"variant":"NameValue","fields":["doc"," coercions]."]},{"variant":"NameValue","fields":["doc",""]},{"variant":"NameValue","fields":["doc"," Third, the standard library defines [The Rust Prelude], a small collection"]},{"variant":"NameValue","fields":["doc"," of items - mostly traits - that are imported into every module of every"]},{"variant":"NameValue","fields":["doc"," crate. 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Like the prelude, the"]},{"variant":"NameValue","fields":["doc"," standard macros are imported by default into all crates."]},{"variant":"NameValue","fields":["doc",""]},{"variant":"NameValue","fields":["doc"," # A Tour of The Rust Standard Library"]},{"variant":"NameValue","fields":["doc",""]},{"variant":"NameValue","fields":["doc"," The rest of this crate documentation is dedicated to pointing out notable"]},{"variant":"NameValue","fields":["doc"," features of The Rust Standard Library."]},{"variant":"NameValue","fields":["doc",""]},{"variant":"NameValue","fields":["doc"," ## Containers and collections"]},{"variant":"NameValue","fields":["doc",""]},{"variant":"NameValue","fields":["doc"," The [`option`] and [`result`] modules define optional and error-handling"]},{"variant":"NameValue","fields":["doc"," types, [`Option<T>`] and [`Result<T, E>`]. 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It is the portable glue"]},{"variant":"NameValue","fields":["doc"," between the language and its libraries, defining the intrinsic and"]},{"variant":"NameValue","fields":["doc"," primitive building blocks of all Rust code. It links to no"]},{"variant":"NameValue","fields":["doc"," upstream libraries, no system libraries, and no libc."]},{"variant":"NameValue","fields":["doc",""]},{"variant":"NameValue","fields":["doc"," [^free]: Strictly speaking, there are some symbols which are needed but"]},{"variant":"NameValue","fields":["doc","          they aren't always necessary."]},{"variant":"NameValue","fields":["doc",""]},{"variant":"NameValue","fields":["doc"," The core library is *minimal*: it isn't even aware of heap allocation,"]},{"variant":"NameValue","fields":["doc"," nor does it provide concurrency or I/O. These things require"]},{"variant":"NameValue","fields":["doc"," platform integration, and this library is platform-agnostic."]},{"variant":"NameValue","fields":["doc",""]},{"variant":"NameValue","fields":["doc"," *It is not recommended to use the core library*. The stable"]},{"variant":"NameValue","fields":["doc"," functionality of libcore is reexported from the"]},{"variant":"NameValue","fields":["doc"," [standard library](../std/index.html). The composition of this library is"]},{"variant":"NameValue","fields":["doc"," subject to change over time; only the interface exposed through libstd is"]},{"variant":"NameValue","fields":["doc"," intended to be stable."]},{"variant":"NameValue","fields":["doc",""]},{"variant":"NameValue","fields":["doc"," # How to use the core library"]},{"variant":"NameValue","fields":["doc",""]},{"variant":"NameValue","fields":["doc"," This library is built on the assumption of a few existing symbols:"]},{"variant":"NameValue","fields":["doc",""]},{"variant":"NameValue","fields":["doc"," * `memcpy`, `memcmp`, `memset` - These are core memory routines which are"]},{"variant":"NameValue","fields":["doc","   often generated by LLVM. Additionally, this library can make explicit"]},{"variant":"NameValue","fields":["doc","   calls to these functions. Their signatures are the same as found in C."]},{"variant":"NameValue","fields":["doc","   These functions are often provided by the system libc, but can also be"]},{"variant":"NameValue","fields":["doc","   provided by the [rlibc crate](https://crates.io/crates/rlibc)."]},{"variant":"NameValue","fields":["doc",""]},{"variant":"NameValue","fields":["doc"," * `rust_begin_unwind` - This function takes three arguments, a"]},{"variant":"NameValue","fields":["doc","   `fmt::Arguments`, a `&str`, and a `u32`. 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When it tries to parse back, it fails as it is incomplete. I'm not sure if this is hitting a buffer limit for the json generation or there is an issue on implementing the Encodable trait.

mitaa · 2016-03-31T06:38:07Z

Minimal testcase:

use std::collections::HashMap;

extern crate rustc_serialize;

#[derive(Hash, Eq, PartialEq, RustcEncodable, RustcDecodable)]
struct DefId(u32);

fn main() {
    let mut coll = HashMap::new();
    coll.insert(DefId(0), ());
    let json = rustc_serialize::json::as_json(&coll).to_string();
    println!("json = {}", json);
}

Outputs just json = {

mitaa · 2016-03-31T07:08:36Z

Encoding coll yields a EncoderError::BadHashmapKey error, but the formatting machinery seems to discard it.

mitaa · 2016-03-31T07:10:56Z

Oh, that makes sense, only strings are allowed as keys in json.

@alexcrichton

(for reference rust-lang#32698) fixes rust-lang#25108 r? @alexcrichton

@alexcrichton

rustdoc: Remove the json-{input, output} format (for reference #32698) fixes #25108 r? @alexcrichton

sanxiyn added the T-rustdoc Relevant to the rustdoc team, which will review and decide on the PR/issue. label May 6, 2015

mitaa mentioned this issue Mar 31, 2016

error generating stdlib in json #32638

Closed

This was referenced Apr 3, 2016

rustdoc: Fix generating documentation from json #32698

Closed

rustdoc: Remove the json-{input, output} format #32773

Merged

Manishearth added a commit to Manishearth/rust that referenced this issue Apr 8, 2016

Rollup merge of rust-lang#32773 - mitaa:rdoc-ttfn-json, r=alexcrichton

3f0daf4

(for reference rust-lang#32698) fixes rust-lang#25108 r? @alexcrichton

bors added a commit that referenced this issue Apr 9, 2016

Auto merge of #32773 - mitaa:rdoc-ttfn-json, r=alexcrichton

c22302f

rustdoc: Remove the json-{input, output} format (for reference #32698) fixes #25108 r? @alexcrichton

bors closed this as completed in #32773 Apr 9, 2016

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rustdoc --output-format json command seems broken #25108

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rustdoc --output-format json command seems broken #25108

rustdoc --output-format json command seems broken #25108

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