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librustc_back: add ToJson trait to Target

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Target's can already be built up from JSON files as well as built into
librustc_back so this adds the ability to convert any Target back into
JSON.

Signed-off-by: Doug Goldstein <cardoe@cardoe.com>
This commit is contained in:
Doug Goldstein 2016-04-07 22:29:01 -05:00
parent 9c83fa41b0
commit c7b6ed27bc
1 changed files with 96 additions and 2 deletions
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98
src/librustc_back/target/mod.rs
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@ -44,7 +44,8 @@
//! the target's settings, though `target-feature` and `link-args` will *add*
//! to the list specified by the target, rather than replace.
use serialize::json::Json;
use serialize::json::{Json, ToJson};
use std::collections::BTreeMap;
use std::default::Default;
use std::io::prelude::*;
use syntax::abi::Abi;
@ -364,7 +365,12 @@ impl Target {
/// Load a target descriptor from a JSON object.
pub fn from_json(obj: Json) -> Target {
// this is 1. ugly, 2. error prone.
// While ugly, this code must remain this way to retain
// compatibility with existing JSON fields and the internal
// expected naming of the Target and TargetOptions structs.
// To ensure compatibility is retained, the built-in targets
// are round-tripped through this code to catch cases where
// the JSON parser is not updated to match the structs.
let get_req_field = |name: &str| {
match obj.find(name)
@ -535,6 +541,94 @@ impl Target {
}
}
impl ToJson for Target {
fn to_json(&self) -> Json {
let mut d = BTreeMap::new();
let default: TargetOptions = Default::default();
macro_rules! target_val {
($attr:ident) => ( {
let name = (stringify!($attr)).replace("_", "-");
d.insert(name.to_string(), self.$attr.to_json());
} );
($attr:ident, $key_name:expr) => ( {
let name = $key_name;
d.insert(name.to_string(), self.$attr.to_json());
} );
}
macro_rules! target_option_val {
($attr:ident) => ( {
let name = (stringify!($attr)).replace("_", "-");
if default.$attr != self.options.$attr {
d.insert(name.to_string(), self.options.$attr.to_json());
}
} );
($attr:ident, $key_name:expr) => ( {
let name = $key_name;
if default.$attr != self.options.$attr {
d.insert(name.to_string(), self.options.$attr.to_json());
}
} );
}
target_val!(llvm_target);
target_val!(target_endian);
target_val!(target_pointer_width);
target_val!(arch);
target_val!(target_os, "os");
target_val!(target_env, "env");
target_val!(target_vendor, "vendor");
target_val!(arch);
target_val!(data_layout);
target_option_val!(is_builtin);
target_option_val!(linker);
target_option_val!(ar);
target_option_val!(pre_link_args);
target_option_val!(pre_link_objects_exe);
target_option_val!(pre_link_objects_dll);
target_option_val!(late_link_args);
target_option_val!(post_link_objects);
target_option_val!(post_link_args);
target_option_val!(cpu);
target_option_val!(features);
target_option_val!(dynamic_linking);
target_option_val!(executables);
target_option_val!(relocation_model);
target_option_val!(code_model);
target_option_val!(disable_redzone);
target_option_val!(eliminate_frame_pointer);
target_option_val!(function_sections);
target_option_val!(dll_prefix);
target_option_val!(dll_suffix);
target_option_val!(exe_suffix);
target_option_val!(staticlib_prefix);
target_option_val!(staticlib_suffix);
target_option_val!(target_family);
target_option_val!(is_like_osx);
target_option_val!(is_like_solaris);
target_option_val!(is_like_windows);
target_option_val!(is_like_msvc);
target_option_val!(is_like_android);
target_option_val!(linker_is_gnu);
target_option_val!(has_rpath);
target_option_val!(no_compiler_rt);
target_option_val!(no_default_libraries);
target_option_val!(position_independent_executables);
target_option_val!(archive_format);
target_option_val!(allow_asm);
target_option_val!(custom_unwind_resume);
target_option_val!(lib_allocation_crate);
target_option_val!(exe_allocation_crate);
target_option_val!(has_elf_tls);
target_option_val!(obj_is_bitcode);
target_option_val!(max_atomic_width);
Json::Object(d)
}
}
fn maybe_jemalloc() -> String {
if cfg!(feature = "jemalloc") {
"alloc_jemalloc".to_string()