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
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139

// This file contains code from external sources.
// Attributions: https://github.com/wasmerio/wasmer/blob/master/ATTRIBUTIONS.md

//! A `Compilation` contains the compiled function bodies for a WebAssembly
//! module (`CompiledFunction`).

use super::trap::TrapInformation;
use crate::entity::PrimaryMap;
use crate::lib::std::vec::Vec;
use crate::{CompiledFunctionUnwindInfo, FunctionAddressMap};
use crate::{
    CustomSection, FunctionIndex, LocalFunctionIndex, Relocation, SectionIndex, SignatureIndex,
};
use rkyv::{Archive, Deserialize as RkyvDeserialize, Serialize as RkyvSerialize};
#[cfg(feature = "enable-serde")]
use serde::{Deserialize, Serialize};

/// The frame info for a Compiled function.
///
/// This structure is only used for reconstructing
/// the frame information after a `Trap`.
#[cfg_attr(feature = "enable-serde", derive(Deserialize, Serialize))]
#[derive(RkyvSerialize, RkyvDeserialize, Archive, Debug, Clone, PartialEq, Eq, Default)]
pub struct CompiledFunctionFrameInfo {
    /// The traps (in the function body).
    ///
    /// Code offsets of the traps MUST be in ascending order.
    pub traps: Vec<TrapInformation>,

    /// The address map.
    pub address_map: FunctionAddressMap,
}

/// The function body.
#[cfg_attr(feature = "enable-serde", derive(Deserialize, Serialize))]
#[derive(RkyvSerialize, RkyvDeserialize, Archive, Debug, Clone, PartialEq, Eq)]
pub struct FunctionBody {
    /// The function body bytes.
    #[cfg_attr(feature = "enable-serde", serde(with = "serde_bytes"))]
    pub body: Vec<u8>,

    /// The function unwind info
    pub unwind_info: Option<CompiledFunctionUnwindInfo>,
}

/// The result of compiling a WebAssembly function.
///
/// This structure only have the compiled information data
/// (function bytecode body, relocations, traps, jump tables
/// and unwind information).
#[cfg_attr(feature = "enable-serde", derive(Deserialize, Serialize))]
#[derive(RkyvSerialize, RkyvDeserialize, Archive, Debug, Clone, PartialEq, Eq)]
pub struct CompiledFunction {
    /// The function body.
    pub body: FunctionBody,

    /// The relocations (in the body)
    pub relocations: Vec<Relocation>,

    /// The frame information.
    pub frame_info: CompiledFunctionFrameInfo,
}

/// The compiled functions map (index in the Wasm -> function)
pub type Functions = PrimaryMap<LocalFunctionIndex, CompiledFunction>;

/// The custom sections for a Compilation.
pub type CustomSections = PrimaryMap<SectionIndex, CustomSection>;

/// The DWARF information for this Compilation.
///
/// It is used for retrieving the unwind information once an exception
/// happens.
/// In the future this structure may also hold other information useful
/// for debugging.
#[cfg_attr(feature = "enable-serde", derive(Deserialize, Serialize))]
#[derive(RkyvSerialize, RkyvDeserialize, Archive, Debug, PartialEq, Eq, Clone)]
#[archive(as = "Self")]
pub struct Dwarf {
    /// The section index in the [`Compilation`] that corresponds to the exception frames.
    /// [Learn
    /// more](https://refspecs.linuxfoundation.org/LSB_3.0.0/LSB-PDA/LSB-PDA/ehframechpt.html).
    pub eh_frame: SectionIndex,
}

impl Dwarf {
    /// Creates a `Dwarf` struct with the corresponding indices for its sections
    pub fn new(eh_frame: SectionIndex) -> Self {
        Self { eh_frame }
    }
}

/// The result of compiling a WebAssembly module's functions.
#[cfg_attr(feature = "enable-serde", derive(Deserialize, Serialize))]
#[derive(Debug, PartialEq, Eq)]
pub struct Compilation {
    /// Compiled code for the function bodies.
    pub functions: Functions,

    /// Custom sections for the module.
    /// It will hold the data, for example, for constants used in a
    /// function, global variables, rodata_64, hot/cold function partitioning, ...
    pub custom_sections: CustomSections,

    /// Trampolines to call a function defined locally in the wasm via a
    /// provided `Vec` of values.
    ///
    /// This allows us to call easily Wasm functions, such as:
    ///
    /// ```ignore
    /// let func = instance.exports.get_function("my_func");
    /// func.call(&[Value::I32(1)]);
    /// ```
    pub function_call_trampolines: PrimaryMap<SignatureIndex, FunctionBody>,

    /// Trampolines to call a dynamic function defined in
    /// a host, from a Wasm module.
    ///
    /// This allows us to create dynamic Wasm functions, such as:
    ///
    /// ```ignore
    /// fn my_func(values: &[Val]) -> Result<Vec<Val>, RuntimeError> {
    ///     // do something
    /// }
    ///
    /// let my_func_type = FunctionType::new(vec![Type::I32], vec![Type::I32]);
    /// let imports = imports!{
    ///     "namespace" => {
    ///         "my_func" => Function::new(&store, my_func_type, my_func),
    ///     }
    /// }
    /// ```
    ///
    /// Note: Dynamic function trampolines are only compiled for imported function types.
    pub dynamic_function_trampolines: PrimaryMap<FunctionIndex, FunctionBody>,

    /// Section ids corresponding to the Dwarf debug info
    pub debug: Option<Dwarf>,
}