thread.rs 9.98 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;
19
use std::sync::Arc;
qinsoon's avatar
qinsoon committed
20 21 22 23 24 25

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
26 27 28
impl_mu_entity!(MuThread);
impl_mu_entity!(MuStack);

29
#[repr(C)]
qinsoon's avatar
qinsoon committed
30
pub struct MuStack {
qinsoon's avatar
qinsoon committed
31
    pub hdr: MuEntityHeader,
qinsoon's avatar
qinsoon committed
32
    
33 34
    func_addr: ValueLocation,
    func_id: MuID, 
qinsoon's avatar
qinsoon committed
35
    
qinsoon's avatar
qinsoon committed
36
    size: ByteSize,
qinsoon's avatar
qinsoon committed
37 38 39 40 41 42 43 44 45 46
    //    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
47 48 49 50 51
    // this frame pointers should only be used when stack is not active
    sp : Address,
    bp : Address,
    ip : Address,
    
qinsoon's avatar
qinsoon committed
52 53
    exception_obj  : Option<Address>,
    
54
    state: MuStackState,
qinsoon's avatar
qinsoon committed
55 56 57 58 59
    #[allow(dead_code)]
    mmap           : memmap::Mmap
}

impl MuStack {
60
    pub fn new(id: MuID, func_addr: ValueLocation, func: &MuFunction) -> MuStack {
qinsoon's avatar
qinsoon committed
61 62 63 64 65 66 67
        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
68 69 70 71 72 73 74 75 76 77 78 79
        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
80
        
qinsoon's avatar
qinsoon committed
81 82 83 84 85 86 87 88
        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),
89
            func_addr: func_addr,
qinsoon's avatar
qinsoon committed
90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107
            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
108
    }
109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162
    
    #[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;
163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194
        
        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); 
195
    }
qinsoon's avatar
qinsoon committed
196 197
}

qinsoon's avatar
qinsoon committed
198 199 200 201 202 203
pub enum MuStackState {
    Ready(Vec<P<MuType>>), // ready to resume when values of given types are supplied (can be empty)
    Active,
    Dead
}

204
#[repr(C)]
205
#[allow(improper_ctypes)]
206
// do not change the layout (unless change the offset of fields correspondingly)
qinsoon's avatar
qinsoon committed
207
pub struct MuThread {
qinsoon's avatar
qinsoon committed
208
    pub hdr: MuEntityHeader,
209
    allocator: mm::Mutator,
qinsoon's avatar
qinsoon committed
210
    pub stack: Option<Box<MuStack>>,
qinsoon's avatar
qinsoon committed
211
    
212
    native_sp_loc: Address,
213 214
    user_tls: Option<Address>,
    
qinsoon's avatar
qinsoon committed
215 216
    pub vm: Arc<VM>,
    pub exception_obj: Address
qinsoon's avatar
qinsoon committed
217 218
}

219 220 221 222 223
// 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
224 225
    
    pub static ref ALLOCATOR_OFFSET : usize = mem::size_of::<MuEntityHeader>();
226 227 228 229 230 231
    
    pub static ref VM_OFFSET : usize = mem::size_of::<MuEntityHeader>() 
                + mem::size_of::<Box<mm::Mutator>>()
                + mem::size_of::<Option<Box<MuStack>>>()
                + mem::size_of::<Address>()
                + mem::size_of::<Option<Address>>();
232 233
}

234 235 236 237
#[cfg(target_arch = "x86_64")]
#[cfg(target_os = "macos")]
#[link(name = "runtime")]
extern "C" {
qinsoon's avatar
qinsoon committed
238
    pub fn set_thread_local(thread: *mut MuThread);
239
    pub fn get_thread_local() -> Address;
240 241 242 243 244 245 246 247
}

#[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);
qinsoon's avatar
qinsoon committed
248
    pub fn get_current_frame_rbp() -> Address;
249 250
}

qinsoon's avatar
qinsoon committed
251
impl MuThread {
252
    pub fn new(id: MuID, allocator: mm::Mutator, stack: Box<MuStack>, user_tls: Option<Address>, vm: Arc<VM>) -> MuThread {
qinsoon's avatar
qinsoon committed
253 254 255 256
        MuThread {
            hdr: MuEntityHeader::unnamed(id),
            allocator: allocator,
            stack: Some(stack),
257
            native_sp_loc: unsafe {Address::zero()},
258 259 260
            user_tls: user_tls,
            vm: vm,
            exception_obj: unsafe {Address::zero()}
qinsoon's avatar
qinsoon committed
261 262
        }
    }
qinsoon's avatar
qinsoon committed
263
    
qinsoon's avatar
qinsoon committed
264
    #[inline(always)]
265 266 267
    pub fn current() -> &'static MuThread {
        unsafe{
            get_thread_local().to_ptr::<MuThread>().as_ref().unwrap()
qinsoon's avatar
qinsoon committed
268 269 270
        }
    }
    
qinsoon's avatar
qinsoon committed
271
    #[inline(always)]
272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292
    pub fn current_mut() -> &'static mut MuThread {
        unsafe{
            get_thread_local().to_ptr_mut::<MuThread>().as_mut().unwrap()
        }
    }
    
    pub fn new_thread_normal(mut stack: Box<MuStack>, threadlocal: Address, vals: Vec<ValueLocation>, vm: Arc<VM>) -> JoinHandle<()> {
        let user_tls = {
            if threadlocal.is_zero() {
                None
            } else {
                Some(threadlocal)
            }
        };
        
        // set up arguments on stack
        stack.runtime_load_args(vals);
        
        MuThread::mu_thread_launch(vm.next_id(), stack, user_tls, vm)
    }    
    
293
    #[no_mangle]
qinsoon's avatar
qinsoon committed
294
    #[allow(unused_variables)]
295
    pub extern fn mu_thread_launch(id: MuID, stack: Box<MuStack>, user_tls: Option<Address>, vm: Arc<VM>) -> JoinHandle<()> {
296 297 298 299
        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
300
        match thread::Builder::new().name(format!("Mu Thread #{}", id)).spawn(move || {
301
            let muthread : *mut MuThread = Box::into_raw(Box::new(MuThread::new(id, mm::new_mutator(), stack, user_tls, vm)));
302 303
            
            // set thread local
304 305 306 307
            unsafe {set_thread_local(muthread)};
            
            let addr = unsafe {get_thread_local()};
            let sp_threadlocal_loc = addr.plus(*NATIVE_SP_LOC_OFFSET);
308 309 310
            
            debug!("new sp: 0x{:x}", new_sp);
            debug!("sp_store: 0x{:x}", sp_threadlocal_loc);
311
            
312 313 314
            unsafe {
                swap_to_mu_stack(new_sp, entry, sp_threadlocal_loc); 
            }
315 316
            
            debug!("returned to Rust stack. Going to quit");
qinsoon's avatar
qinsoon committed
317 318 319 320 321
        }) {
            Ok(handle) => handle,
            Err(_) => panic!("failed to create a thread")
        }
    }
322 323
}

qinsoon's avatar
qinsoon committed
324
#[derive(Debug, RustcEncodable, RustcDecodable)]
325 326 327
pub struct MuPrimordialThread {
    pub func_id: MuID,
    pub args: Vec<Constant>
qinsoon's avatar
qinsoon committed
328
}