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use crate::{
error::CompileResult,
module::ModuleInner,
state::ModuleStateMap,
typed_func::Wasm,
types::{LocalFuncIndex, SigIndex},
vm,
};
use crate::{
cache::{Artifact, Error as CacheError},
codegen::BreakpointMap,
module::ModuleInfo,
sys::Memory,
};
use std::{any::Any, ptr::NonNull};
use std::collections::HashMap;
pub mod sys {
pub use crate::sys::*;
}
pub use crate::sig_registry::SigRegistry;
/// The target architecture for code generation.
#[derive(Copy, Clone, Debug)]
pub enum Architecture {
/// x86-64.
X64,
/// Aarch64 (ARM64).
Aarch64,
}
/// The type of an inline breakpoint.
#[repr(u8)]
#[derive(Copy, Clone, Debug)]
pub enum InlineBreakpointType {
/// A middleware invocation breakpoint.
Middleware,
}
/// Information of an inline breakpoint.
#[derive(Clone, Debug)]
pub struct InlineBreakpoint {
/// Size in bytes taken by this breakpoint's instruction sequence.
pub size: usize,
/// Type of the inline breakpoint.
pub ty: InlineBreakpointType,
}
/// This type cannot be constructed from
/// outside the runtime crate.
pub struct Token {
_private: (),
}
impl Token {
pub(crate) fn generate() -> Self {
Self { _private: () }
}
}
#[derive(Copy, Clone, Debug)]
pub enum MemoryBoundCheckMode {
Default,
Enable,
Disable,
}
impl Default for MemoryBoundCheckMode {
fn default() -> MemoryBoundCheckMode {
MemoryBoundCheckMode::Default
}
}
/// Controls which experimental features will be enabled.
#[derive(Debug, Default)]
pub struct Features {
pub simd: bool,
pub threads: bool,
}
/// Use this to point to a compiler config struct provided by the backend.
/// The backend struct must support runtime reflection with `Any`, which is any
/// struct that does not contain a non-`'static` reference.
#[derive(Debug)]
pub struct BackendCompilerConfig(pub Box<dyn Any + 'static>);
impl BackendCompilerConfig {
/// Obtain the backend-specific compiler config struct.
pub fn get_specific<T: 'static>(&self) -> Option<&T> {
self.0.downcast_ref::<T>()
}
}
/// Configuration data for the compiler
#[derive(Debug, Default)]
pub struct CompilerConfig {
/// Symbol information generated from emscripten; used for more detailed debug messages
pub symbol_map: Option<HashMap<u32, String>>,
pub memory_bound_check_mode: MemoryBoundCheckMode,
pub enforce_stack_check: bool,
pub track_state: bool,
pub features: Features,
// Target info. Presently only supported by LLVM.
pub triple: Option<String>,
pub cpu_name: Option<String>,
pub cpu_features: Option<String>,
pub backend_specific_config: Option<BackendCompilerConfig>,
}
pub trait Compiler {
/// Compiles a `Module` from WebAssembly binary format.
/// The `CompileToken` parameter ensures that this can only
/// be called from inside the runtime.
fn compile(
&self,
wasm: &[u8],
comp_conf: CompilerConfig,
_: Token,
) -> CompileResult<ModuleInner>;
unsafe fn from_cache(&self, cache: Artifact, _: Token) -> Result<ModuleInner, CacheError>;
}
pub trait RunnableModule: Send + Sync {
/// This returns a pointer to the function designated by the `local_func_index`
/// parameter.
fn get_func(
&self,
info: &ModuleInfo,
local_func_index: LocalFuncIndex,
) -> Option<NonNull<vm::Func>>;
fn get_module_state_map(&self) -> Option<ModuleStateMap> {
None
}
fn get_breakpoints(&self) -> Option<BreakpointMap> {
None
}
unsafe fn patch_local_function(&self, _idx: usize, _target_address: usize) -> bool {
false
}
/// A wasm trampoline contains the necessary data to dynamically call an exported wasm function.
/// Given a particular signature index, we return a trampoline that is matched with that
/// signature and an invoke function that can call the trampoline.
fn get_trampoline(&self, info: &ModuleInfo, sig_index: SigIndex) -> Option<Wasm>;
/// Trap an error.
unsafe fn do_early_trap(&self, data: Box<dyn Any + Send>) -> !;
/// Returns the machine code associated with this module.
fn get_code(&self) -> Option<&[u8]> {
None
}
/// Returns the beginning offsets of all functions, including import trampolines.
fn get_offsets(&self) -> Option<Vec<usize>> {
None
}
/// Returns the beginning offsets of all local functions.
fn get_local_function_offsets(&self) -> Option<Vec<usize>> {
None
}
/// Returns the inline breakpoint size corresponding to an Architecture (None in case is not implemented)
fn get_inline_breakpoint_size(&self, _arch: Architecture) -> Option<usize> {
None
}
/// Attempts to read an inline breakpoint from the code.
///
/// Inline breakpoints are detected by special instruction sequences that never
/// appear in valid code.
fn read_inline_breakpoint(
&self,
_arch: Architecture,
_code: &[u8],
) -> Option<InlineBreakpoint> {
None
}
}
pub trait CacheGen: Send + Sync {
fn generate_cache(&self) -> Result<(Box<[u8]>, Memory), CacheError>;
}