dynasm 5.0.0

A plugin for assembling code at runtime. Combined with the runtime crate dynasmrt it can be used to write JIT compilers easily.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
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

use syn::parse;
use proc_macro_error2::emit_error;

mod ast;
mod compiler;
mod parser;
mod debug;
mod x64data;

use crate::State;
use crate::arch::Arch;

#[cfg(feature = "dynasm_opmap")]
pub use debug::create_opmap;

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum X86Mode {
    Long,
    Protected
}

struct Context<'a, 'b: 'a> {
    pub state: &'a mut State<'b>,
    pub mode: X86Mode,
    pub features: x64data::Features
}

#[derive(Clone, Debug)]
pub struct Archx64 {
    features: x64data::Features
}

impl Default for Archx64 {
    fn default() -> Archx64 {
        Archx64 { features: x64data::Features::all() }
    }
}

impl Arch for Archx64 {
    fn set_features(&mut self, features: &[syn::Ident]) {
        let mut new_features = x64data::Features::empty();
        for ident in features {
            new_features |= match x64data::Features::from_str(&ident.to_string()) {
                Some(feature) => feature,
                None => {
                    emit_error!(ident, "Architecture x64 does not support feature '{}'", ident);
                    continue;
                }
            }
        }
        self.features = new_features;
    }

    fn default_align(&self) -> u8 {
        0x90
    }

    fn compile_instruction(&self, state: &mut State, input: parse::ParseStream) -> parse::Result<()> {
        let mut ctx = Context {
            state,
            mode: X86Mode::Long,
            features: self.features
        };
        let (instruction, args) = parser::parse_instruction(&mut ctx, input)?;
        let span = instruction.span;

        if let Err(Some(e)) = compiler::compile_instruction(&mut ctx, instruction, args) {
            emit_error!(span, e);
        }
        Ok(())
    }
}

#[derive(Clone, Debug)]
pub struct Archx86 {
    features: x64data::Features
}

impl Default for Archx86 {
    fn default() -> Archx86 {
        Archx86 { features: x64data::Features::all() }
    }
}

impl Arch for Archx86 {
    fn set_features(&mut self, features: &[syn::Ident]) {
        let mut new_features = x64data::Features::empty();
        for ident in features {
            new_features |= match x64data::Features::from_str(&ident.to_string()) {
                Some(feature) => feature,
                None => {
                    emit_error!(ident, "Architecture x86 does not support feature '{}'", ident);
                    continue;
                }
            }
        }
        self.features = new_features;
    }

    fn default_align(&self) -> u8 {
        0x90
    }

    fn compile_instruction(&self, state: &mut State, input: parse::ParseStream) -> parse::Result<()> {
        let mut ctx = Context {
            state,
            mode: X86Mode::Protected,
            features: self.features
        };
        let (instruction, args) = parser::parse_instruction(&mut ctx, input)?;
        let span = instruction.span;

        if let Err(Some(e)) = compiler::compile_instruction(&mut ctx, instruction, args) {
            emit_error!(span, e);
        }
        Ok(())
    }
}