// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

//! The Rust compiler.
//!
//! # Note
//!
//! This API is completely unstable and subject to change.

#![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
      html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
      html_root_url = "https://doc.rust-lang.org/nightly/")]
#![deny(warnings)]

#![feature(box_patterns)]
#![feature(box_syntax)]
#![feature(custom_attribute)]
#![feature(fs_read_write)]
#![allow(unused_attributes)]
#![feature(i128_type)]
#![feature(i128)]
#![feature(inclusive_range)]
#![feature(inclusive_range_syntax)]
#![feature(libc)]
#![feature(quote)]
#![feature(rustc_diagnostic_macros)]
#![feature(slice_patterns)]
#![feature(conservative_impl_trait)]
#![feature(optin_builtin_traits)]

use rustc::dep_graph::WorkProduct;
use syntax_pos::symbol::Symbol;

#[macro_use]
extern crate bitflags;
extern crate flate2;
extern crate libc;
#[macro_use] extern crate rustc;
extern crate jobserver;
extern crate num_cpus;
extern crate rustc_mir;
extern crate rustc_allocator;
extern crate rustc_apfloat;
extern crate rustc_back;
extern crate rustc_binaryen;
extern crate rustc_const_math;
extern crate rustc_data_structures;
extern crate rustc_demangle;
extern crate rustc_incremental;
extern crate rustc_llvm as llvm;
extern crate rustc_platform_intrinsics as intrinsics;
extern crate rustc_trans_utils;

#[macro_use] extern crate log;
#[macro_use] extern crate syntax;
extern crate syntax_pos;
extern crate rustc_errors as errors;
extern crate serialize;
#[cfg(windows)]
extern crate cc; // Used to locate MSVC
extern crate tempdir;

use back::bytecode::RLIB_BYTECODE_EXTENSION;

pub use llvm_util::{target_features, print_version, print_passes};

use std::any::Any;
use std::path::PathBuf;
use std::rc::Rc;
use std::sync::mpsc;

use rustc::dep_graph::DepGraph;
use rustc::hir::def_id::CrateNum;
use rustc::middle::cstore::MetadataLoader;
use rustc::middle::cstore::{NativeLibrary, CrateSource, LibSource};
use rustc::session::{Session, CompileIncomplete};
use rustc::session::config::{OutputFilenames, OutputType, PrintRequest};
use rustc::ty::{self, TyCtxt};
use rustc::util::nodemap::{FxHashSet, FxHashMap};
use rustc_mir::monomorphize;
use rustc_trans_utils::trans_crate::TransCrate;

mod diagnostics;

mod back {
    pub use rustc_trans_utils::symbol_names;
    mod archive;
    pub mod bytecode;
    mod command;
    pub mod linker;
    pub mod link;
    mod lto;
    pub mod symbol_export;
    pub mod write;
    mod rpath;
}

mod abi;
mod allocator;
mod asm;
mod attributes;
mod base;
mod builder;
mod cabi_aarch64;
mod cabi_arm;
mod cabi_asmjs;
mod cabi_hexagon;
mod cabi_mips;
mod cabi_mips64;
mod cabi_msp430;
mod cabi_nvptx;
mod cabi_nvptx64;
mod cabi_powerpc;
mod cabi_powerpc64;
mod cabi_s390x;
mod cabi_sparc;
mod cabi_sparc64;
mod cabi_x86;
mod cabi_x86_64;
mod cabi_x86_win64;
mod callee;
mod common;
mod consts;
mod context;
mod debuginfo;
mod declare;
mod glue;
mod intrinsic;
mod llvm_util;
mod metadata;
mod meth;
mod mir;
mod time_graph;
mod trans_item;
mod type_;
mod type_of;
mod value;

pub struct LlvmTransCrate(());

impl !Send for LlvmTransCrate {} // Llvm is on a per-thread basis
impl !Sync for LlvmTransCrate {}

impl LlvmTransCrate {
    pub fn new(sess: &Session) -> Box<TransCrate> {
        llvm_util::init(sess); // Make sure llvm is inited
        box LlvmTransCrate(())
    }
}

impl TransCrate for LlvmTransCrate {
    fn print(&self, req: PrintRequest, sess: &Session) {
        match req {
            PrintRequest::RelocationModels => {
                println!("Available relocation models:");
                for &(name, _) in back::write::RELOC_MODEL_ARGS.iter() {
                    println!("    {}", name);
                }
                println!("");
            }
            PrintRequest::CodeModels => {
                println!("Available code models:");
                for &(name, _) in back::write::CODE_GEN_MODEL_ARGS.iter(){
                    println!("    {}", name);
                }
                println!("");
            }
            PrintRequest::TlsModels => {
                println!("Available TLS models:");
                for &(name, _) in back::write::TLS_MODEL_ARGS.iter(){
                    println!("    {}", name);
                }
                println!("");
            }
            req => llvm_util::print(req, sess),
        }
    }

    fn target_features(&self, sess: &Session) -> Vec<Symbol> {
        target_features(sess)
    }

    fn metadata_loader(&self) -> Box<MetadataLoader> {
        box metadata::LlvmMetadataLoader
    }

    fn provide(&self, providers: &mut ty::maps::Providers) {
        back::symbol_names::provide(providers);
        back::symbol_export::provide(providers);
        base::provide(providers);
        attributes::provide(providers);
    }

    fn provide_extern(&self, providers: &mut ty::maps::Providers) {
        back::symbol_export::provide_extern(providers);
    }

    fn trans_crate<'a, 'tcx>(
        &self,
        tcx: TyCtxt<'a, 'tcx, 'tcx>,
        rx: mpsc::Receiver<Box<Any + Send>>
    ) -> Box<Any> {
        box base::trans_crate(tcx, rx)
    }

    fn join_trans_and_link(
        &self,
        trans: Box<Any>,
        sess: &Session,
        dep_graph: &DepGraph,
        outputs: &OutputFilenames,
    ) -> Result<(), CompileIncomplete>{
        use rustc::util::common::time;
        let trans = trans.downcast::<::back::write::OngoingCrateTranslation>()
            .expect("Expected LlvmTransCrate's OngoingCrateTranslation, found Box<Any>")
            .join(sess, dep_graph);
        if sess.opts.debugging_opts.incremental_info {
            back::write::dump_incremental_data(&trans);
        }

        time(sess.time_passes(),
             "serialize work products",
             move || rustc_incremental::save_work_products(sess, &dep_graph));

        sess.compile_status()?;

        if !sess.opts.output_types.keys().any(|&i| i == OutputType::Exe ||
                                                   i == OutputType::Metadata) {
            return Ok(());
        }

        // Run the linker on any artifacts that resulted from the LLVM run.
        // This should produce either a finished executable or library.
        time(sess.time_passes(), "linking", || {
            back::link::link_binary(sess, &trans, outputs, &trans.crate_name.as_str());
        });

        // Now that we won't touch anything in the incremental compilation directory
        // any more, we can finalize it (which involves renaming it)
        rustc_incremental::finalize_session_directory(sess, trans.link.crate_hash);

        Ok(())
    }
}

/// This is the entrypoint for a hot plugged rustc_trans
#[no_mangle]
pub fn __rustc_codegen_backend(sess: &Session) -> Box<TransCrate> {
    LlvmTransCrate::new(sess)
}

struct ModuleTranslation {
    /// The name of the module. When the crate may be saved between
    /// compilations, incremental compilation requires that name be
    /// unique amongst **all** crates.  Therefore, it should contain
    /// something unique to this crate (e.g., a module path) as well
    /// as the crate name and disambiguator.
    name: String,
    llmod_id: String,
    source: ModuleSource,
    kind: ModuleKind,
}

#[derive(Copy, Clone, Debug, PartialEq)]
enum ModuleKind {
    Regular,
    Metadata,
    Allocator,
}

impl ModuleTranslation {
    fn llvm(&self) -> Option<&ModuleLlvm> {
        match self.source {
            ModuleSource::Translated(ref llvm) => Some(llvm),
            ModuleSource::Preexisting(_) => None,
        }
    }

    fn into_compiled_module(self,
                                emit_obj: bool,
                                emit_bc: bool,
                                emit_bc_compressed: bool,
                                outputs: &OutputFilenames) -> CompiledModule {
        let pre_existing = match self.source {
            ModuleSource::Preexisting(_) => true,
            ModuleSource::Translated(_) => false,
        };
        let object = if emit_obj {
            Some(outputs.temp_path(OutputType::Object, Some(&self.name)))
        } else {
            None
        };
        let bytecode = if emit_bc {
            Some(outputs.temp_path(OutputType::Bitcode, Some(&self.name)))
        } else {
            None
        };
        let bytecode_compressed = if emit_bc_compressed {
            Some(outputs.temp_path(OutputType::Bitcode, Some(&self.name))
                    .with_extension(RLIB_BYTECODE_EXTENSION))
        } else {
            None
        };

        CompiledModule {
            llmod_id: self.llmod_id,
            name: self.name.clone(),
            kind: self.kind,
            pre_existing,
            object,
            bytecode,
            bytecode_compressed,
        }
    }
}

#[derive(Debug)]
struct CompiledModule {
    name: String,
    llmod_id: String,
    kind: ModuleKind,
    pre_existing: bool,
    object: Option<PathBuf>,
    bytecode: Option<PathBuf>,
    bytecode_compressed: Option<PathBuf>,
}

enum ModuleSource {
    /// Copy the `.o` files or whatever from the incr. comp. directory.
    Preexisting(WorkProduct),

    /// Rebuild from this LLVM module.
    Translated(ModuleLlvm),
}

#[derive(Debug)]
struct ModuleLlvm {
    llcx: llvm::ContextRef,
    llmod: llvm::ModuleRef,
    tm: llvm::TargetMachineRef,
}

unsafe impl Send for ModuleLlvm { }
unsafe impl Sync for ModuleLlvm { }

impl Drop for ModuleLlvm {
    fn drop(&mut self) {
        unsafe {
            llvm::LLVMDisposeModule(self.llmod);
            llvm::LLVMContextDispose(self.llcx);
            llvm::LLVMRustDisposeTargetMachine(self.tm);
        }
    }
}

struct CrateTranslation {
    crate_name: Symbol,
    modules: Vec<CompiledModule>,
    allocator_module: Option<CompiledModule>,
    metadata_module: CompiledModule,
    link: rustc::middle::cstore::LinkMeta,
    metadata: rustc::middle::cstore::EncodedMetadata,
    windows_subsystem: Option<String>,
    linker_info: back::linker::LinkerInfo,
    crate_info: CrateInfo,
}

// Misc info we load from metadata to persist beyond the tcx
struct CrateInfo {
    panic_runtime: Option<CrateNum>,
    compiler_builtins: Option<CrateNum>,
    profiler_runtime: Option<CrateNum>,
    sanitizer_runtime: Option<CrateNum>,
    is_no_builtins: FxHashSet<CrateNum>,
    native_libraries: FxHashMap<CrateNum, Rc<Vec<NativeLibrary>>>,
    crate_name: FxHashMap<CrateNum, String>,
    used_libraries: Rc<Vec<NativeLibrary>>,
    link_args: Rc<Vec<String>>,
    used_crate_source: FxHashMap<CrateNum, Rc<CrateSource>>,
    used_crates_static: Vec<(CrateNum, LibSource)>,
    used_crates_dynamic: Vec<(CrateNum, LibSource)>,
}

#[cfg(not(stage0))] // remove after the next snapshot
__build_diagnostic_array! { librustc_trans, DIAGNOSTICS }
