mod.rs 7.97 KB
Newer Older
1
use utils;
2
use ast::ir::*;
3
use vm::VM;
4 5
use compiler::backend::Word;
use compiler::backend::RegGroup;
qinsoon's avatar
qinsoon committed
6
use utils::Address;
7

8
use std::fmt;
9 10 11
use std::os::raw::c_char;
use std::os::raw::c_void;
use std::ffi::CString;
12 13
use std::ffi::CStr;
use std::sync::Arc;
14

15
pub mod mm;
qinsoon's avatar
qinsoon committed
16
pub mod thread;
qinsoon's avatar
qinsoon committed
17
pub mod math;
qinsoon's avatar
qinsoon committed
18
pub mod entrypoints;
qinsoon's avatar
qinsoon committed
19 20 21

#[cfg(target_arch = "x86_64")]
#[path = "exception_x64.rs"]
22
pub mod exception;
qinsoon's avatar
qinsoon committed
23

24 25 26
// consider using libloading crate instead of the raw c functions for dynalic libraries
// however i am not sure if libloading can load symbols from current process (not from an actual dylib)
// so here i use dlopen/dlsym from C
27 28 29 30
#[link(name="dl")]
extern "C" {
    fn dlopen(filename: *const c_char, flags: isize) -> *const c_void;
    fn dlsym(handle: *const c_void, symbol: *const c_char) -> *const c_void;
31
    fn dlerror() -> *const c_char;
32 33 34 35 36 37 38
}

pub fn resolve_symbol(symbol: String) -> Address {
    use std::ptr;
    
    let rtld_default = unsafe {dlopen(ptr::null(), 0)};
    let ret = unsafe {dlsym(rtld_default, CString::new(symbol.clone()).unwrap().as_ptr())};
39 40 41 42 43 44 45 46

    let error = unsafe {dlerror()};
    if !error.is_null() {
        let cstr = unsafe {CStr::from_ptr(error)};
        println!("cannot find symbol: {}", symbol);
        println!("{}", cstr.to_str().unwrap());

        panic!("failed to resolve symbol");
47 48 49 50 51
    }
    
    Address::from_ptr(ret)
}

qinsoon's avatar
qinsoon committed
52 53
use rustc_serialize::{Encodable, Encoder, Decodable, Decoder};

qinsoon's avatar
qinsoon committed
54
#[derive(PartialEq, Eq, Hash, Clone, Debug)]
55
pub enum ValueLocation {
qinsoon's avatar
qinsoon committed
56 57 58
    Register(RegGroup, MuID),     // 0
    Constant(RegGroup, Word),     // 1    
    Relocatable(RegGroup, MuName),// 2
59
    
qinsoon's avatar
qinsoon committed
60 61 62 63
    Direct(RegGroup, Address),    // 3
    Indirect(RegGroup, Address),  // 4
}

64 65 66 67 68 69 70 71 72 73 74 75
impl fmt::Display for ValueLocation {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            &ValueLocation::Register(_, id) => write!(f, "VL_Reg: {}", id),
            &ValueLocation::Constant(_, val) => write!(f, "VL_Const: {}", val),
            &ValueLocation::Relocatable(_, ref name) => write!(f, "VL_Reloc: {}", name),
            &ValueLocation::Direct(_, addr) => write!(f, "VL_Direct: 0x{:x}", addr),
            &ValueLocation::Indirect(_, addr) => write!(f, "VL_Indirect: 0x{:x}", addr)
        }
    }
}

qinsoon's avatar
qinsoon committed
76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141
impl Encodable for ValueLocation {
    fn encode<S: Encoder> (&self, s: &mut S) -> Result<(), S::Error> {
        s.emit_enum("ValueLocation", |s| {
            match self {
                &ValueLocation::Register(grp, id) => {
                    s.emit_enum_variant("Register", 0, 2, |s| {
                        try!(s.emit_enum_variant_arg(0, |s| grp.encode(s)));
                        try!(s.emit_enum_variant_arg(1, |s| id.encode(s)));
                        Ok(())
                    })
                }
                &ValueLocation::Constant(grp, val) => {
                    s.emit_enum_variant("Constant", 1, 2, |s| {
                        try!(s.emit_enum_variant_arg(0, |s| grp.encode(s)));
                        try!(s.emit_enum_variant_arg(1, |s| val.encode(s)));
                        Ok(())
                    })    
                }                
                &ValueLocation::Relocatable(grp, ref name) => {
                    s.emit_enum_variant("Relocatable", 2, 2, |s| {
                        try!(s.emit_enum_variant_arg(0, |s| grp.encode(s)));
                        try!(s.emit_enum_variant_arg(1, |s| name.encode(s)));
                        Ok(())
                    })
                }
                &ValueLocation::Direct(_, _)
                | &ValueLocation::Indirect(_, _) => {
                    panic!("trying to encode an address location (not persistent)")
                }
            }
        })
    }
}

impl Decodable for ValueLocation {
    fn decode<D: Decoder>(d: &mut D) -> Result<ValueLocation, D::Error> {
        d.read_enum("ValueLocation", |d| {
            d.read_enum_variant(
                &vec!["Register", "Constant", "Relocatable"],
                |d, idx| {
                    match idx {
                        0 => {
                            // Register variant
                            let grp = try!(d.read_enum_variant_arg(0, |d| Decodable::decode(d)));
                            let id = try!(d.read_enum_variant_arg(1, |d| Decodable::decode(d)));
                            
                            Ok(ValueLocation::Register(grp, id))
                        }
                        1 => {
                            // Constant
                            let grp = try!(d.read_enum_variant_arg(0, |d| Decodable::decode(d)));
                            let val = try!(d.read_enum_variant_arg(1, |d| Decodable::decode(d)));
                            Ok(ValueLocation::Constant(grp, val))
                        }
                        2 => {
                            // Relocatable
                            let grp = try!(d.read_enum_variant_arg(0, |d| Decodable::decode(d)));
                            let name = try!(d.read_enum_variant_arg(1, |d| Decodable::decode(d)));
                            Ok(ValueLocation::Relocatable(grp, name))
                        }
                        _ => panic!("unexpected enum variant for ValueLocation: {}", idx)
                    }
                }
             ) 
        })
    }
142 143 144 145 146 147 148
}

impl ValueLocation {
    pub fn load_value(&self) -> (RegGroup, Word) {
        match self {
            &ValueLocation::Register(_, _)
            | &ValueLocation::Direct(_, _)
149 150 151 152 153
            | &ValueLocation::Indirect(_, _) => unimplemented!(),
            
            &ValueLocation::Constant(group, word) => {
                (group, word)
            }
154 155 156
            &ValueLocation::Relocatable(_, _) => panic!("expect a runtime value")
        }
    }
qinsoon's avatar
qinsoon committed
157
    
158
    #[allow(unused_variables)]
qinsoon's avatar
qinsoon committed
159
    pub fn from_constant(c: Constant) -> ValueLocation {
160 161 162 163 164 165 166
        match c {
            Constant::Int(int_val) => ValueLocation::Constant(RegGroup::GPR, utils::mem::u64_to_raw(int_val)),
            Constant::Float(f32_val) => ValueLocation::Constant(RegGroup::FPR, utils::mem::f32_to_raw(f32_val)),
            Constant::Double(f64_val) => ValueLocation::Constant(RegGroup::FPR, utils::mem::f64_to_raw(f64_val)),
            
            _ => unimplemented!()
        }
qinsoon's avatar
qinsoon committed
167
    }
qinsoon's avatar
qinsoon committed
168 169 170 171 172 173 174 175 176 177
    
    pub fn to_address(&self) -> Address {
        match self {
            &ValueLocation::Register(_, _)
            | &ValueLocation::Constant(_, _) => panic!("a register/constant cannot be turned into address"),
            &ValueLocation::Direct(_, addr) => addr, 
            &ValueLocation::Indirect(_, addr) => unsafe {addr.load::<Address>()},
            &ValueLocation::Relocatable(_, ref symbol) => resolve_symbol(symbol.clone())
        }
    }
178 179 180 181 182 183 184

    pub fn to_relocatable(&self) -> MuName {
        match self {
            &ValueLocation::Relocatable(_, ref name) => name.clone(),
            _ => panic!("expecting Relocatable location, found {}", self)
        }
    }
185 186
}

187 188
pub const PRIMORDIAL_ENTRY : &'static str = "src/runtime/main.c";

189 190
#[no_mangle]
pub extern fn mu_trace_level_log() {
qinsoon's avatar
qinsoon committed
191
    VM::start_logging_trace();
192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214
}

#[no_mangle]
pub extern fn mu_main(serialized_vm : *const c_char) {      
    debug!("mu_main() started...");
    
    let str_vm = unsafe{CStr::from_ptr(serialized_vm)}.to_str().unwrap();
    
    let vm : Arc<VM> = Arc::new(VM::resume_vm(str_vm));
    
    let primordial = vm.primordial.read().unwrap();
    if primordial.is_none() {
        panic!("no primordial thread/stack/function. Client should provide an entry point");
    } else {
        let primordial = primordial.as_ref().unwrap();
        
        // create mu stack
        let stack = vm.new_stack(primordial.func_id);
        
        let args : Vec<ValueLocation> = primordial.args.iter().map(|arg| ValueLocation::from_constant(arg.clone())).collect();
        
        // FIXME: currently assumes no user defined thread local
        // will need to fix this after we can serialize heap object
215
        let thread = thread::MuThread::new_thread_normal(stack, unsafe{Address::zero()}, args, vm.clone());
216 217 218
        
        thread.join().unwrap();
    }
219
}