/
codegen.rs
264 lines (233 loc) 路 7.47 KB
/
codegen.rs
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
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
use crate::{
backend::RunnableModule,
backend::{Backend, CacheGen, Compiler, CompilerConfig, Token},
cache::{Artifact, Error as CacheError},
error::{CompileError, CompileResult},
module::{ModuleInfo, ModuleInner},
structures::Map,
types::{FuncIndex, FuncSig, SigIndex},
};
use smallvec::SmallVec;
use std::fmt;
use std::fmt::Debug;
use std::marker::PhantomData;
use wasmparser::{Operator, Type as WpType};
#[derive(Debug)]
pub enum Event<'a, 'b> {
Internal(InternalEvent),
Wasm(&'b Operator<'a>),
}
pub enum InternalEvent {
FunctionBegin(u32),
FunctionEnd,
Breakpoint(Box<Fn(BkptInfo) + Send + Sync + 'static>),
SetInternal(u32),
GetInternal(u32),
}
impl fmt::Debug for InternalEvent {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
InternalEvent::FunctionBegin(_) => write!(f, "FunctionBegin"),
InternalEvent::FunctionEnd => write!(f, "FunctionEnd"),
InternalEvent::Breakpoint(_) => write!(f, "Breakpoint"),
InternalEvent::SetInternal(_) => write!(f, "SetInternal"),
InternalEvent::GetInternal(_) => write!(f, "GetInternal"),
}
}
}
pub struct BkptInfo {}
pub trait ModuleCodeGenerator<FCG: FunctionCodeGenerator<E>, RM: RunnableModule, E: Debug> {
fn new() -> Self;
fn backend_id() -> Backend;
fn check_precondition(&mut self, module_info: &ModuleInfo) -> Result<(), E>;
/// Creates a new function and returns the function-scope code generator for it.
fn next_function(&mut self) -> Result<&mut FCG, E>;
fn finalize(self, module_info: &ModuleInfo) -> Result<(RM, Box<dyn CacheGen>), E>;
fn feed_signatures(&mut self, signatures: Map<SigIndex, FuncSig>) -> Result<(), E>;
/// Sets function signatures.
fn feed_function_signatures(&mut self, assoc: Map<FuncIndex, SigIndex>) -> Result<(), E>;
/// Adds an import function.
fn feed_import_function(&mut self) -> Result<(), E>;
unsafe fn from_cache(cache: Artifact, _: Token) -> Result<ModuleInner, CacheError>;
}
pub struct StreamingCompiler<
MCG: ModuleCodeGenerator<FCG, RM, E>,
FCG: FunctionCodeGenerator<E>,
RM: RunnableModule + 'static,
E: Debug,
CGEN: Fn() -> MiddlewareChain,
> {
middleware_chain_generator: CGEN,
_phantom_mcg: PhantomData<MCG>,
_phantom_fcg: PhantomData<FCG>,
_phantom_rm: PhantomData<RM>,
_phantom_e: PhantomData<E>,
}
pub struct SimpleStreamingCompilerGen<
MCG: ModuleCodeGenerator<FCG, RM, E>,
FCG: FunctionCodeGenerator<E>,
RM: RunnableModule + 'static,
E: Debug,
> {
_phantom_mcg: PhantomData<MCG>,
_phantom_fcg: PhantomData<FCG>,
_phantom_rm: PhantomData<RM>,
_phantom_e: PhantomData<E>,
}
impl<
MCG: ModuleCodeGenerator<FCG, RM, E>,
FCG: FunctionCodeGenerator<E>,
RM: RunnableModule + 'static,
E: Debug,
> SimpleStreamingCompilerGen<MCG, FCG, RM, E>
{
pub fn new() -> StreamingCompiler<MCG, FCG, RM, E, impl Fn() -> MiddlewareChain> {
StreamingCompiler::new(|| MiddlewareChain::new())
}
}
impl<
MCG: ModuleCodeGenerator<FCG, RM, E>,
FCG: FunctionCodeGenerator<E>,
RM: RunnableModule + 'static,
E: Debug,
CGEN: Fn() -> MiddlewareChain,
> StreamingCompiler<MCG, FCG, RM, E, CGEN>
{
pub fn new(chain_gen: CGEN) -> Self {
Self {
middleware_chain_generator: chain_gen,
_phantom_mcg: PhantomData,
_phantom_fcg: PhantomData,
_phantom_rm: PhantomData,
_phantom_e: PhantomData,
}
}
}
impl<
MCG: ModuleCodeGenerator<FCG, RM, E>,
FCG: FunctionCodeGenerator<E>,
RM: RunnableModule + 'static,
E: Debug,
CGEN: Fn() -> MiddlewareChain,
> Compiler for StreamingCompiler<MCG, FCG, RM, E, CGEN>
{
fn compile(
&self,
wasm: &[u8],
compiler_config: CompilerConfig,
_: Token,
) -> CompileResult<ModuleInner> {
let mut mcg = MCG::new();
let mut chain = (self.middleware_chain_generator)();
let info = crate::parse::read_module(
wasm,
MCG::backend_id(),
&mut mcg,
&mut chain,
&compiler_config,
)?;
let (exec_context, cache_gen) =
mcg.finalize(&info)
.map_err(|x| CompileError::InternalError {
msg: format!("{:?}", x),
})?;
Ok(ModuleInner {
cache_gen,
runnable_module: Box::new(exec_context),
info,
})
}
unsafe fn from_cache(
&self,
artifact: Artifact,
token: Token,
) -> Result<ModuleInner, CacheError> {
MCG::from_cache(artifact, token)
}
}
pub struct EventSink<'a, 'b> {
buffer: SmallVec<[Event<'a, 'b>; 2]>,
}
impl<'a, 'b> EventSink<'a, 'b> {
pub fn push(&mut self, ev: Event<'a, 'b>) {
self.buffer.push(ev);
}
}
pub struct MiddlewareChain {
chain: Vec<Box<GenericFunctionMiddleware>>,
}
impl MiddlewareChain {
pub fn new() -> MiddlewareChain {
MiddlewareChain { chain: vec![] }
}
pub fn push<M: FunctionMiddleware + 'static>(&mut self, m: M) {
self.chain.push(Box::new(m));
}
pub(crate) fn run<E: Debug, FCG: FunctionCodeGenerator<E>>(
&mut self,
fcg: Option<&mut FCG>,
ev: Event,
module_info: &ModuleInfo,
) -> Result<(), String> {
let mut sink = EventSink {
buffer: SmallVec::new(),
};
sink.push(ev);
for m in &mut self.chain {
let prev: SmallVec<[Event; 2]> = sink.buffer.drain().collect();
for ev in prev {
m.feed_event(ev, module_info, &mut sink)?;
}
}
if let Some(fcg) = fcg {
for ev in sink.buffer {
fcg.feed_event(ev, module_info)
.map_err(|x| format!("{:?}", x))?;
}
}
Ok(())
}
}
pub trait FunctionMiddleware {
type Error: Debug;
fn feed_event<'a, 'b: 'a>(
&mut self,
op: Event<'a, 'b>,
module_info: &ModuleInfo,
sink: &mut EventSink<'a, 'b>,
) -> Result<(), Self::Error>;
}
pub(crate) trait GenericFunctionMiddleware {
fn feed_event<'a, 'b: 'a>(
&mut self,
op: Event<'a, 'b>,
module_info: &ModuleInfo,
sink: &mut EventSink<'a, 'b>,
) -> Result<(), String>;
}
impl<E: Debug, T: FunctionMiddleware<Error = E>> GenericFunctionMiddleware for T {
fn feed_event<'a, 'b: 'a>(
&mut self,
op: Event<'a, 'b>,
module_info: &ModuleInfo,
sink: &mut EventSink<'a, 'b>,
) -> Result<(), String> {
<Self as FunctionMiddleware>::feed_event(self, op, module_info, sink)
.map_err(|x| format!("{:?}", x))
}
}
/// The function-scope code generator trait.
pub trait FunctionCodeGenerator<E: Debug> {
/// Sets the return type.
fn feed_return(&mut self, ty: WpType) -> Result<(), E>;
/// Adds a parameter to the function.
fn feed_param(&mut self, ty: WpType) -> Result<(), E>;
/// Adds `n` locals to the function.
fn feed_local(&mut self, ty: WpType, n: usize) -> Result<(), E>;
/// Called before the first call to `feed_opcode`.
fn begin_body(&mut self, module_info: &ModuleInfo) -> Result<(), E>;
/// Called for each operator.
fn feed_event(&mut self, op: Event, module_info: &ModuleInfo) -> Result<(), E>;
/// Finalizes the function.
fn finalize(&mut self) -> Result<(), E>;
}