thread.rs 8.89 KB
Newer Older
qinsoon's avatar
qinsoon committed
1
#![allow(dead_code)]
qinsoon's avatar
qinsoon committed
2 3

use ast::ir::*;
qinsoon's avatar
qinsoon committed
4 5 6
use ast::ptr::*;
use ast::types::*;
use vm::VM;
7
use runtime;
8
use runtime::ValueLocation;
9
use runtime::mm;
qinsoon's avatar
qinsoon committed
10

qinsoon's avatar
qinsoon committed
11
use utils::ByteSize;
qinsoon's avatar
qinsoon committed
12 13 14 15
use utils::Address;
use utils::mem::memmap;
use utils::mem::memsec;

16
use std::mem;
qinsoon's avatar
qinsoon committed
17 18
use std::thread;
use std::thread::JoinHandle;
qinsoon's avatar
qinsoon committed
19 20 21 22 23 24

pub const STACK_SIZE : ByteSize = (4 << 20); // 4mb

#[cfg(target_arch = "x86_64")]
pub const PAGE_SIZE  : ByteSize = (4 << 10); // 4kb

qinsoon's avatar
qinsoon committed
25 26 27
impl_mu_entity!(MuThread);
impl_mu_entity!(MuStack);

28
#[repr(C)]
qinsoon's avatar
qinsoon committed
29
pub struct MuStack {
qinsoon's avatar
qinsoon committed
30
    pub hdr: MuEntityHeader,
qinsoon's avatar
qinsoon committed
31
    
32 33
    func_addr: ValueLocation,
    func_id: MuID, 
qinsoon's avatar
qinsoon committed
34
    
qinsoon's avatar
qinsoon committed
35
    size: ByteSize,
qinsoon's avatar
qinsoon committed
36 37 38 39 40 41 42 43 44 45
    //    lo addr                                                    hi addr
    //     | overflow guard page | actual stack ..................... | underflow guard page|
    //     |                     |                                    |                     |
    // overflowGuard           lowerBound                           upperBound
    //                                                              underflowGuard    
    overflow_guard : Address,
    lower_bound    : Address,
    upper_bound    : Address,
    underflow_guard: Address,
    
qinsoon's avatar
qinsoon committed
46 47 48 49 50
    // this frame pointers should only be used when stack is not active
    sp : Address,
    bp : Address,
    ip : Address,
    
qinsoon's avatar
qinsoon committed
51 52
    exception_obj  : Option<Address>,
    
53
    state: MuStackState,
qinsoon's avatar
qinsoon committed
54 55 56 57 58
    #[allow(dead_code)]
    mmap           : memmap::Mmap
}

impl MuStack {
59
    pub fn new(id: MuID, func_addr: ValueLocation, func: &MuFunction) -> MuStack {
qinsoon's avatar
qinsoon committed
60 61 62 63 64 65 66
        let total_size = PAGE_SIZE * 2 + STACK_SIZE;
        
        let anon_mmap = match memmap::Mmap::anonymous(total_size, memmap::Protection::ReadWrite) {
            Ok(m) => m,
            Err(_) => panic!("failed to mmap for a stack"),
        };
        
qinsoon's avatar
qinsoon committed
67 68 69 70 71 72 73 74 75 76 77 78
        let mmap_start = Address::from_ptr(anon_mmap.ptr());
        debug_assert!(mmap_start.is_aligned_to(PAGE_SIZE));
        
        let overflow_guard = mmap_start;
        let lower_bound = mmap_start.plus(PAGE_SIZE);
        let upper_bound = lower_bound.plus(STACK_SIZE);
        let underflow_guard = upper_bound;
        
        unsafe {
            memsec::mprotect(overflow_guard.to_ptr_mut::<u8>(),  PAGE_SIZE, memsec::Prot::NoAccess);
            memsec::mprotect(underflow_guard.to_ptr_mut::<u8>(), PAGE_SIZE, memsec::Prot::NoAccess);
        }
qinsoon's avatar
qinsoon committed
79
        
qinsoon's avatar
qinsoon committed
80 81 82 83 84 85 86 87
        debug!("creating stack {} with entry func {:?}", id, func);
        debug!("overflow_guard : {}", overflow_guard);
        debug!("lower_bound    : {}", lower_bound);
        debug!("upper_bound    : {}", upper_bound);
        debug!("underflow_guard: {}", underflow_guard);
        
        MuStack {
            hdr: MuEntityHeader::unnamed(id),
88
            func_addr: func_addr,
qinsoon's avatar
qinsoon committed
89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106
            func_id: func.id(),
            
            state: MuStackState::Ready(func.sig.arg_tys.clone()),
            
            size: STACK_SIZE,
            overflow_guard: overflow_guard,
            lower_bound: lower_bound,
            upper_bound: upper_bound,
            underflow_guard: upper_bound,
            
            sp: upper_bound,
            bp: upper_bound,
            ip: unsafe {Address::zero()},
            
            exception_obj: None,
            
            mmap: anon_mmap
        }
qinsoon's avatar
qinsoon committed
107
    }
108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161
    
    #[cfg(target_arch = "x86_64")]
    pub fn runtime_load_args(&mut self, vals: Vec<ValueLocation>) {
        use compiler::backend::Word;
        use compiler::backend::WORD_SIZE;
        use compiler::backend::RegGroup;
        use compiler::backend::x86_64;
        
        let mut gpr_used = vec![];
        let mut fpr_used = vec![];
        
        for i in 0..vals.len() {
            let ref val = vals[i];
            let (reg_group, word) = val.load_value();
            
            match reg_group {
                RegGroup::GPR => gpr_used.push(word),
                RegGroup::FPR => fpr_used.push(word),
            }
        }
        
        let mut stack_ptr = self.sp;
        for i in 0..x86_64::ARGUMENT_FPRs.len() {
            stack_ptr = stack_ptr.sub(WORD_SIZE);
            let val = {
                if i < fpr_used.len() {
                    fpr_used[i]
                } else {
                    0 as Word
                }
            };
            
            debug!("store {} to {}", val, stack_ptr);
            unsafe {stack_ptr.store(val);}
        }
        
        for i in 0..x86_64::ARGUMENT_GPRs.len() {
            stack_ptr = stack_ptr.sub(WORD_SIZE);
            let val = {
                if i < gpr_used.len() {
                    gpr_used[i]
                } else {
                    0 as Word
                }
            };
            
            debug!("store {} to {}", val, stack_ptr);
            unsafe {stack_ptr.store(val);}
        }
        
        // should have put 6 + 6 words on the stack
        debug_assert!(self.sp.diff(stack_ptr) == 12 * WORD_SIZE);
        // save it back
        self.sp = stack_ptr;
162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193
        
        self.print_stack(Some(20));
    }
    
    pub fn print_stack(&self, n_entries: Option<usize>) {
        use compiler::backend::Word;
        use compiler::backend::WORD_SIZE;
        
        let mut cursor = self.upper_bound.sub(WORD_SIZE);
        let mut count = 0;
        
        println!("0x{:x} | UPPER_BOUND", self.upper_bound); 
        while cursor >= self.lower_bound {
            let val = unsafe{cursor.load::<Word>()};
            print!("0x{:x} | 0x{:x} ({})", cursor, val, val);
            
            if cursor == self.sp {
                print!(" <- SP");
            }
            
            println!("");
            
            cursor = cursor.sub(WORD_SIZE);
            count += 1;
            
            if n_entries.is_some() && count > n_entries.unwrap() {
                println!("...");
                break;
            }
        }
        
        println!("0x{:x} | LOWER_BOUND", self.lower_bound); 
194
    }
qinsoon's avatar
qinsoon committed
195 196
}

qinsoon's avatar
qinsoon committed
197 198 199 200 201 202
pub enum MuStackState {
    Ready(Vec<P<MuType>>), // ready to resume when values of given types are supplied (can be empty)
    Active,
    Dead
}

203
#[repr(C)]
204
#[allow(improper_ctypes)]
qinsoon's avatar
qinsoon committed
205
pub struct MuThread {
qinsoon's avatar
qinsoon committed
206
    pub hdr: MuEntityHeader,
207
    allocator: Box<mm::Mutator>,
qinsoon's avatar
qinsoon committed
208 209
    stack: Option<Box<MuStack>>,
    
210
    native_sp_loc: Address,
qinsoon's avatar
qinsoon committed
211 212 213
    user_tls: Option<Address>
}

214 215 216 217 218
// this depends on the layout of MuThread
lazy_static! {
    pub static ref NATIVE_SP_LOC_OFFSET : usize = mem::size_of::<MuEntityHeader>() 
                + mem::size_of::<Box<mm::Mutator>>()
                + mem::size_of::<Option<Box<MuStack>>>();
qinsoon's avatar
qinsoon committed
219 220
    
    pub static ref ALLOCATOR_OFFSET : usize = mem::size_of::<MuEntityHeader>();
221 222
}

223 224 225 226
#[cfg(target_arch = "x86_64")]
#[cfg(target_os = "macos")]
#[link(name = "runtime")]
extern "C" {
qinsoon's avatar
qinsoon committed
227
    pub fn set_thread_local(thread: *mut MuThread);
228
    pub fn get_thread_local() -> Address;
229 230 231 232 233 234 235 236
}

#[cfg(target_arch = "x86_64")]
#[cfg(target_os = "macos")]
#[link(name = "swap_stack")]
extern "C" {
    fn swap_to_mu_stack(new_sp: Address, entry: Address, old_sp_loc: Address);
    fn swap_back_to_native_stack(sp_loc: Address);
237 238
}

qinsoon's avatar
qinsoon committed
239
impl MuThread {
240
    pub fn new(id: MuID, allocator: Box<mm::Mutator>, stack: Box<MuStack>, user_tls: Option<Address>) -> MuThread {
qinsoon's avatar
qinsoon committed
241 242 243 244
        MuThread {
            hdr: MuEntityHeader::unnamed(id),
            allocator: allocator,
            stack: Some(stack),
245
            native_sp_loc: unsafe {Address::zero()},
qinsoon's avatar
qinsoon committed
246 247 248
            user_tls: user_tls
        }
    }
qinsoon's avatar
qinsoon committed
249
    
qinsoon's avatar
qinsoon committed
250 251 252 253 254 255 256 257 258 259
    pub fn fake_thread(id: MuID, allocator: Box<mm::Mutator>) -> MuThread {
        MuThread {
            hdr: MuEntityHeader::unnamed(id),
            allocator: allocator,
            stack: None,
            native_sp_loc: unsafe {Address::zero()},
            user_tls: None
        }
    }
    
260
    #[no_mangle]
qinsoon's avatar
qinsoon committed
261
    #[allow(unused_variables)]
262
    pub extern fn mu_thread_launch(id: MuID, stack: Box<MuStack>, user_tls: Option<Address>, vm: &VM) -> JoinHandle<()> {
263 264 265 266
        let new_sp = stack.sp;
        let entry = runtime::resolve_symbol(vm.name_of(stack.func_id));
        debug!("entry : 0x{:x}", entry);
        
qinsoon's avatar
qinsoon committed
267
        match thread::Builder::new().name(format!("Mu Thread #{}", id)).spawn(move || {
268
            let muthread : *mut MuThread = Box::into_raw(Box::new(MuThread::new(id, mm::new_mutator(), stack, user_tls)));
269 270
            
            // set thread local
271 272 273 274
            unsafe {set_thread_local(muthread)};
            
            let addr = unsafe {get_thread_local()};
            let sp_threadlocal_loc = addr.plus(*NATIVE_SP_LOC_OFFSET);
275 276 277
            
            debug!("new sp: 0x{:x}", new_sp);
            debug!("sp_store: 0x{:x}", sp_threadlocal_loc);
278
            
279 280 281
            unsafe {
                swap_to_mu_stack(new_sp, entry, sp_threadlocal_loc); 
            }
282 283
            
            debug!("returned to Rust stack. Going to quit");
qinsoon's avatar
qinsoon committed
284 285 286 287 288
        }) {
            Ok(handle) => handle,
            Err(_) => panic!("failed to create a thread")
        }
    }
289 290
}

qinsoon's avatar
qinsoon committed
291
#[derive(Debug, RustcEncodable, RustcDecodable)]
292 293 294
pub struct MuPrimordialThread {
    pub func_id: MuID,
    pub args: Vec<Constant>
qinsoon's avatar
qinsoon committed
295
}