config: &regalloc::TargetConfig,

    storage: &Session 'scratch

) throws (alloc::AllocError) {

    let view = try il::published::publish(func, storage);

    let ralloc = try regalloc::allocate(&view, config, storage);

}

/// Record an alternate name for the next function emitted.

export fn recordFunctionAlias(generator: &mut Generator, name: *[u8]) {

    let codeLen = generator.e.codeLen;

use super::isel;

/// Branch forms whose taken edge supplies block parameters.

union ParameterEdge: Copy { Jump, Then, Else, Case, Default }

@test unsafe fn publishedParameters() throws (testing::TestError) {

    for edge in [ParameterEdge::Jump, ParameterEdge::Then, ParameterEdge::Else,

        ParameterEdge::Case, ParameterEdge::Default]

    {

        let mut params = [il::Param { value: il::Reg { n: 0 }, type: il::Type::W64 }];

        let mut gen = generator(&mut code);

        use arena as storage in {

            let view = try! il::published::publish(&func, &storage);

            let config = super::targetConfig();

            let allocation = try! regalloc::allocate(&view, &config, &storage);

            assert gen.e.error == nil;

            let expected = try! storage.copy(&gen.e.code[..gen.e.codeLen]);

            set params[0].value.n = 0xffffffff;

            set targetParams[0].value.n = 0xffffffff;

            alloc::reset(&mut code);

            set gen = generator(&mut code);

            assert gen.e.error == nil and gen.e.codeLen == expected.len;

            for word, i in expected {

                assert gen.e.code[i] == word;

            }

        }

}

/// Reusable emitter allocation storage.

static MEMORY: [u8; 16777216] = [0; 16777216];

/// Selection retains published locations and consecutive-location deduplication.

@test unsafe fn publishedLocations() throws (testing::TestError) {

    // Storage for machine instructions, fixups, and source location entries.

    static DEBUG_MEMORY: [u8; 33554432] = [0; 33554432];

    let mut locations = [il::SrcLoc { moduleId: 1, offset: 10 },

        let config = super::targetConfig();

        let allocation = try! regalloc::allocate(&view, &config, &storage);

        for i in 0..locations.len {

            set locations[i] = il::SrcLoc { moduleId: 9, offset: 99 };

        }

        assert emitter.error == nil;

        let output: 'output = &emitter in {

            let entries = emit::getDebugEntries(output);

            assert entries.len == 2;

            assert entries[0].moduleId == 1 and entries[0].offset == 10;

    isDynamic: bool,

}

/// Add a block's reserve instructions to the accumulated frame requirements.

/// Returns the total size needed for all static reserves, respecting alignment.

    let mut offset = previous.size;

    let mut isDynamic = previous.isDynamic;

    for instr in instrs {

            case il::Instr::Reserve { size, alignment, .. } => {

                if let case il::Val::Imm(sz) = size {

                    if alignment == 0 or (alignment & (alignment - 1)) <> 0 or sz < 0 {

                        return nil;

                    }

        }

    }

    return ReserveInfo { size: offset, isDynamic };

}

    e: &mut emit::Emitter,

    ralloc: &regalloc::AllocResult 'scratch,

    view: &il::published::Function 'scratch

) {

    if e.error <> nil {

        return;

    }

    // Reset block offsets for this function.

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

    // Pre-scan for constant-sized reserves to promote to fixed frame slots.

    let mut reserveInfo = ReserveInfo { size: 0, isDynamic: false };

            set e.error = super::Error::Capacity;

            return;

        };

        set reserveInfo = next;

    }

    if reserveInfo.size as u64 + ralloc.spill.frameSize as u64 > 0x7fffff00 {

        set e.error = super::Error::Capacity; return;

    }

    // Compute frame layout from spill slots, reserve slots, and used callee-saved registers.

    let frame = emit::computeFrame(

        ralloc.spill.frameSize + reserveInfo.size,

        ralloc.usedCalleeSaved,

        view.blocks.len,

            reserveOffset: 0, pendingSpill: nil,

            nextSynthBlock: view.blocks.len + 1,

            isDynamic: frame.isDynamic,

        };

        // Record function name for printing.

        // Record function code offset for call patching.

        // Emit prologue.

        emit::emitPrologue(s.e, &frame);

        // Move function params from arg registers to assigned registers.

        // Cross-call params may have been assigned to callee-saved registers

        // Emit each block.

        for i in 0..view.blocks.len {

            if s.e.error <> nil {

                return;

            }

        }

        // Emit epilogue.

        emit::emitEpilogue(s.e, &frame);

        // Patch local branches now that all blocks are emitted.

        emit::patchLocalBranches(s.e);

    }

}

/// Select instructions for a block.

    // Record block address for branch patching.

    emit::recordBlock(s.e, blockIdx);

    // Block parameters are handled at jump sites (in `Jmp`/`Br`).

    // By the time we enter the block, the arguments have already been

    // moved to the parameter registers by the predecessor's terminator.

    // Process each instruction, auto-committing any pending spill after each.

    let locations = view.blocks[blockIdx].locations;

    let hasLocs = locations.len > 0;

        if s.e.error <> nil {

            return;

        }

        // Record debug location before emitting machine instructions.

        if hasLocs {

            emit::recordSrcLoc(s.e, locations[i]);

        }

        set s.pendingSpill = nil;

        // Flush the pending spill store, if any.

        if let p = s.pendingSpill {

            if let slot = regalloc::spill::spillSlot(&s.ralloc.spill, p.ssa) {

                emit::emitSd(s.e, p.rd, spillBase(s), spillOffset(s, slot));

        }

    }

}

/// Select instructions for a single IL instruction.

    match *instr {

            selectJump(s, blockIdx, target, view.blocks[target].params, args);

        },

            let params: &'scratch [il::Param] = view.blocks[thenTarget].params

                if thenArgs.len > 0 and elseArgs.len == 0

                else view.blocks[elseTarget].params if elseArgs.len > 0 and thenArgs.len == 0

                else &view.params[..0];

            selectBranch(s, blockIdx, instr, params, thenArgs, elseArgs);

        },

            let rs1 = resolveVal(s, super::SCRATCH1, val);

            for c in cases {

                let params: &'scratch [il::Param] = view.blocks[c.target].params

                    if c.args.len > 0 else &view.params[..0];

                selectSwitchCase(s, rs1, c.value, c.target, params, c.args);

            }

            // Fall through to default.

            emitBlockArgs(s, view.blocks[defaultTarget].params, defaultArgs);

            emit::recordBranch(s.e, defaultTarget, emit::BranchKind::Jump);

        },

    }

}

/// Compare one switch case and emit its argument moves only on a match.

fn selectSwitchCase 'scratch 'selection (

/// Select a conditional branch with parameters for its argument-bearing edge.

fn selectBranch 'scratch 'selection (

    s: &mut Selector 'scratch 'selection,

    blockIdx: u32,

    params: &[il::Param],

    thenArgs: &[il::Val],

    elseArgs: &[il::Val]

) where 'scratch: 'selection {

        else panic "selectBranch: expected conditional branch";

    // Use zero register directly for immediate `0` operands.

    let aIsZero = isZeroImm(a);

    let bIsZero = isZeroImm(b);

//!

use std::lang::alloc;

use std::lang::il;

/// Largest element count represented by an analysis slice.

constant MAX_ELEMENTS: u32 = 0xffffffff;

/// Published function tables within one analysis lifetime.

export record Function: 'view + Copy {

    /// Function parameter definitions.

    params: &'view [il::Param],

    /// Blocks in source order.

    blocks: &'view [Block 'view],

}

    locations: &'view [il::SrcLoc],

    /// Loop nesting depth for cost weighting.

    loopDepth: u32,

}

export opaque record Instruction: 'view + Copy {

    /// Original instruction pointer, used only for identity comparisons.

    identity: *unsafe il::Instr,

    /// Destination register, when the instruction defines a value.

    destination: ?il::Reg,

    /// Whether the instruction has call-clobber semantics.

    isCall: bool,

    /// Source registers in operand order, including repeated uses.

    operands: &'view [il::Reg],

    /// Successor block positions in branch order.

    targets: &'view [u32],

}

/// All source tables and nested arrays must remain valid during this call.

/// Original node pointers are identity values, not published storage borrows.

export unsafe fn publish 'view (function: &il::Fn, storage: &Session 'view)

    -> Function 'view throws (alloc::AllocError)

{

    let params = try storage.copy(function.params);

    let blocks: &[il::Block] = function.blocks;

    if blocks.len == 0 {

        let none: [Block 'view; 0] = [];

    }

    let first = try publishBlock(&blocks[0], storage);

    let views = try storage.fill(first, blocks.len);

    for i in 1..blocks.len {

        set views[i] = try publishBlock(&blocks[i], storage);

    }

}

/// Copy block definitions and each instruction's analysis tables.

unsafe fn publishBlock 'view (block: &il::Block, storage: &Session 'view)

    -> Block 'view throws (alloc::AllocError)

    for i in 0..count {

        let reg = il::nextReg(&mut cursor, source)

            else panic "publishInstruction: operand count changed";

        set operands[i] = reg;

    }

        destination: il::instrDst(*source), isCall: il::isCall(*source),

        operands: &operands[..], targets };

}

/// Return the original instruction pointer for identity comparisons.

export fn identity 'view (instruction: &Instruction 'view) -> *unsafe il::Instr {

    return instruction.identity;

}

        assert not published::isCall(&block.instructions[0]);

        let returned = published::registers(&block.instructions[1]);

        assert returned.len == 1 and returned[0].n == 9;

        assert published::destination(&block.instructions[1]) == nil;

        assert published::successors(&block.instructions[1]).len == 0;

    }

}

/// Empty functions require no analysis storage.

@test unsafe fn testEmptyPublication() throws (testing::TestError) {

            for reg in registers {

                assert reg.n == 7;

            }

            let targets = published::successors(instruction);

            assert targets.len == 2 and targets[0] == 0 and targets[1] == 0;

        }

    }

}

/// Allocation failures leave no borrowed source storage in published results.

@test unsafe fn testPublicationAllocationFailure() throws (testing::TestError) {

    let mut instructions = [il::Instr::Call { retTy: il::Type::W64, dst: nil,

    let blocks = [il::Block { label: "entry", params: &[], instrs: &mut instructions[..],

        locs: &locations[..], preds: &[], loopDepth: 0 }];

    let function = il::Fn { name: "allocation", params: &[], returnType: il::Type::W64,

        isExtern: false, isLeaf: false, blocks: &blocks[..] };

    let mut succeeded = false;

        let mut arena = alloc::new(&mut DATA[..capacity]);

        let input: 'input = &function in {

            use arena as storage in {

                if let view = try? published::publish(input, &storage) {

                    let registers = published::registers(&view.blocks[0].instructions[0]);

                    assert registers.len == 1 and registers[0].n == 4;

                    assert view.blocks[0].locations[0].offset == 17;

                    set succeeded = true;

                } else {

                    assert not succeeded;

                }

            }