wasmtime_environ/
module_artifacts.rs

1//! Definitions of runtime structures and metadata which are serialized into ELF
2//! with `bincode` as part of a module's compilation process.
3
4use crate::prelude::*;
5use crate::{DefinedFuncIndex, FilePos, FuncIndex, Module, ModuleInternedTypeIndex, PrimaryMap};
6use core::fmt;
7use core::ops::Range;
8use core::str;
9use serde_derive::{Deserialize, Serialize};
10
11/// Secondary in-memory results of function compilation.
12#[derive(Clone, Serialize, Deserialize)]
13pub struct CompiledFunctionInfo {
14    /// Where this function was found in the original wasm file.
15    pub start_srcloc: FilePos,
16    /// The [`FunctionLoc`] indicating the location of this function in the text
17    /// section of the competition artifact.
18    pub wasm_func_loc: FunctionLoc,
19    /// A trampoline for array callers (e.g. `Func::new`) calling into this function (if needed).
20    pub array_to_wasm_trampoline: Option<FunctionLoc>,
21}
22
23/// Description of where a function is located in the text section of a
24/// compiled image.
25#[derive(Copy, Clone, Debug, Serialize, Deserialize)]
26pub struct FunctionLoc {
27    /// The byte offset from the start of the text section where this
28    /// function starts.
29    pub start: u32,
30    /// The byte length of this function's function body.
31    pub length: u32,
32}
33
34/// Secondary in-memory results of module compilation.
35///
36/// This opaque structure can be optionally passed back to
37/// `CompiledModule::from_artifacts` to avoid decoding extra information there.
38#[derive(Serialize, Deserialize)]
39pub struct CompiledModuleInfo {
40    /// Type information about the compiled WebAssembly module.
41    pub module: Module,
42
43    /// Metadata about each compiled function.
44    pub funcs: PrimaryMap<DefinedFuncIndex, CompiledFunctionInfo>,
45
46    /// Sorted list, by function index, of names we have for this module.
47    pub func_names: Vec<FunctionName>,
48
49    /// Metadata about wasm-to-array trampolines. Used when exposing a native
50    /// callee (e.g. `Func::wrap`) to a Wasm caller. Sorted by signature index.
51    pub wasm_to_array_trampolines: Vec<(ModuleInternedTypeIndex, FunctionLoc)>,
52
53    /// General compilation metadata.
54    pub meta: Metadata,
55}
56
57/// The name of a function stored in the
58/// [`ELF_NAME_DATA`](crate::obj::ELF_NAME_DATA) section.
59#[derive(Serialize, Deserialize)]
60pub struct FunctionName {
61    /// The Wasm function index of this function.
62    pub idx: FuncIndex,
63    /// The offset of the name in the
64    /// [`ELF_NAME_DATA`](crate::obj::ELF_NAME_DATA) section.
65    pub offset: u32,
66    /// The length of the name in bytes.
67    pub len: u32,
68}
69
70/// Metadata associated with a compiled ELF artifact.
71#[derive(Serialize, Deserialize)]
72pub struct Metadata {
73    /// Whether or not the original wasm module contained debug information that
74    /// we skipped and did not parse.
75    pub has_unparsed_debuginfo: bool,
76
77    /// Offset in the original wasm file to the code section.
78    pub code_section_offset: u64,
79
80    /// Whether or not custom wasm-specific dwarf sections were inserted into
81    /// the ELF image.
82    ///
83    /// Note that even if this flag is `true` sections may be missing if they
84    /// weren't found in the original wasm module itself.
85    pub has_wasm_debuginfo: bool,
86
87    /// Dwarf sections and the offsets at which they're stored in the
88    /// ELF_WASMTIME_DWARF
89    pub dwarf: Vec<(u8, Range<u64>)>,
90}
91
92/// Value of a configured setting for a [`Compiler`](crate::Compiler)
93#[derive(Serialize, Deserialize, Hash, Eq, PartialEq, Debug)]
94pub enum FlagValue<'a> {
95    /// Name of the value that has been configured for this setting.
96    Enum(&'a str),
97    /// The numerical value of the configured settings.
98    Num(u8),
99    /// Whether the setting is on or off.
100    Bool(bool),
101}
102
103impl fmt::Display for FlagValue<'_> {
104    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
105        match self {
106            Self::Enum(v) => v.fmt(f),
107            Self::Num(v) => v.fmt(f),
108            Self::Bool(v) => v.fmt(f),
109        }
110    }
111}
112
113/// Types of objects that can be created by `Compiler::object`
114pub enum ObjectKind {
115    /// A core wasm compilation artifact
116    Module,
117    /// A component compilation artifact
118    Component,
119}
wasmtime_environ/module_artifacts.rs

wasmtime_environ/
module_artifacts.rs
