use std::lang::sexpr;

use std::lang::gen::data;

use std::lang::gen::types;

use std::sys;

use std::sys::unix;

/// Maximum number of modules we can load per package.

const MAX_LOADED_MODULES: u32 = 64;

/// Maximum number of packages we can compile.

const MAX_PACKAGES: u32 = 4;

/// Errors emitted by resolver.

static RESOLVER_ERRORS: [resolver::Error; resolver::MAX_ERRORS] = undefined;

/// Code generation storage.

static CODEGEN_DATA_SYMS: [data::DataSym; data::MAX_DATA_SYMS] = undefined;

/// Debug info file extension.

const DEBUG_EXT: *[u8] = ".debug";

/// Read-only data file extension.

        io::print("\n");

        return;

    }

    if ctx.dump == Dump::Asm {

        // TODO: Why do we generate code in two places?

        printer::printCodeTo(&mut out, entryPkg.name, result.code, result.funcs, &mut res.arena);

        io::print("\n");

        return;

    }

    // Generate binary output if path specified.

        io::printError("radiance: fatal: no default function found\n");

        throw Error::Other;

    }

    pkgLog(entryPkg, &["generating code", "(", outPath, ")", ".."]);

    let result = rv64::generate(&program, storage, &mut RO_DATA_BUF[..], &mut RW_DATA_BUF[..], &mut res.arena, ctx.debug);

    if not writeCode(result.code, outPath) {

        io::printError("radiance: fatal: failed to write output file\n");

        throw Error::Other;

    }

pub mod printer;

@test mod tests;

use std::mem;

use std::lang::il;

use std::lang::alloc;

use std::lang::gen::labels;

use std::lang::gen::regalloc;

use std::lang::gen::data;

/// Storage buffers passed from driver for code generation.

pub record Storage {

    /// Buffer for data symbols.

    dataSyms: *mut [data::DataSym],

}

/// Result of code generation.

pub record Program {

    /// Slice of emitted code.

    let mut dataSymCount: u32 = 0;

    let roLayoutSize = data::layoutSection(program, storage.dataSyms, &mut dataSymCount, RO_DATA_BASE, true);

    data::layoutSection(program, storage.dataSyms, &mut dataSymCount, RW_DATA_BASE, false);

    // Code base address: code follows read-only data, aligned to dword boundary.

    let codeBase = mem::alignUp(RO_DATA_BASE + roLayoutSize, DWORD_SIZE as u32);

    // Emit placeholder entry jump to default function if there is one.

    // We'll patch this at the end once we know where the function is.

        emit::emit(&mut e, encode::nop()); // Placeholder for two-instruction jump.

        emit::emit(&mut e, encode::nop()); //

    }

    // Generate code for all functions.

    for i in 0..program.fns.len {

        let func = program.fns[i];

        if not func.isExtern {

            let checkpoint = alloc::save(arena);

            let ralloc = try! regalloc::allocate(func, &config, arena);

            // Reclaim unused memory after instruction selection.

            alloc::restore(arena, checkpoint);

        }

    }

    // Patch function calls and address loads now that all functions are emitted.

    emit::patchCalls(&mut e);

    emit::patchAddrLoads(&mut e);

    // Emit data sections.

    return Program {

        code: emit::getCode(&e),

        funcs: emit::getFuncs(&e),

        roDataSize,

pub record Selector {

    /// Emitter for outputting instructions.

    e: *mut emit::Emitter,

    /// Register allocation result.

    ralloc: *regalloc::AllocResult,

    /// Total stack frame size.

    frameSize: i32,

    /// Running offset into the reserve region of the frame.

    /// Tracks current position within the pre-allocated reserve slots.

    reserveOffset: i32,

    return getReg(s, ssa);

}

/// Look up symbol address in data map.

fn lookupDataSym(s: *Selector, name: *[u8]) -> u32 throws (SelectorError) {

        throw SelectorError::Internal;

    };

    return addr;

}

}

/// Select instructions for a function.

pub fn selectFn(

    e: *mut emit::Emitter,

    ralloc: *regalloc::AllocResult,

    func: *il::Fn

) {

    // Reset block offsets for this function.

    labels::resetBlocks(&mut e.labels);

        ralloc.usedCalleeSaved,

        func.blocks.len

    );

    // Synthetic block indices start after real blocks and the epilogue block.

    let mut s = Selector {

        reserveOffset: 0, pendingSpill: nil,

        nextSynthBlock: func.blocks.len + 1,

    };

    // Record function name for printing.

    emit::recordFunc(s.e, func.name);

//!

//! Target-independent routines for laying out data symbols and

//! serializing initialized data into binary sections.

use std::mem;

use std::lang::il;

use std::lang::gen::labels;

/// Maximum number of data symbols.

pub const MAX_DATA_SYMS: u32 = 8192;

/// Data symbol entry mapping name to address.

pub record DataSym {

    /// Symbol name.

    name: *[u8],

    /// Absolute address, including data base address.

    addr: u32,

}

/// Lay out data symbols for a single section.

/// Initialized data is placed first, then uninitialized, so that only

/// initialized data needs to be written to the output file.

/// Returns the updated offset past all placed symbols.

pub fn layoutSection(

/// Emit data bytes for a single section (read-only or read-write) into `buf`.

/// Iterates initialized data in the IL program, serializing each data item.

/// Returns the total number of bytes written.

pub fn emitSection(

    program: *il::Program,

    fnLabels: *labels::Labels,

    codeBase: u32,

    buf: *mut [u8],

    readOnly: bool

) -> u32 {

                            let valPtr = &val as *u8;

                            try! mem::copy(&mut buf[offset..], @sliceOf(valPtr, size));

                            offset += size;

                        },

                        case il::DataItem::Sym(name) => {

                                panic "emitSection: data symbol not found";

                            };

                            // Write 8-byte pointer: low 4 bytes are the

                            // address, high 4 bytes are zero.

                            // TODO: Use `u64` once it's supported.

        }

    }

    return offset;

}

pub fn lookupDataSymAddr(dataSyms: *[DataSym], name: *[u8]) -> ?u32 {

    for i in 0..dataSyms.len {

        let sym = dataSyms[i];

        if mem::eq(sym.name, name) {

            return sym.addr;