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
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
use container;
use cretonne_codegen::binemit::{Addend, CodeOffset, NullTrapSink, Reloc, RelocSink};
use cretonne_codegen::isa::TargetIsa;
use cretonne_codegen::{self, binemit, ir};
use cretonne_module::{
Backend, DataContext, DataDescription, Init, Linkage, ModuleError, ModuleNamespace,
ModuleResult,
};
use faerie;
use failure::Error;
use std::fs::File;
use target_lexicon::Triple;
use traps::{FaerieTrapManifest, FaerieTrapSink};
#[derive(Debug)]
pub enum FaerieTrapCollection {
Disabled,
Enabled,
}
pub struct FaerieBuilder {
isa: Box<TargetIsa>,
name: String,
collect_traps: FaerieTrapCollection,
libcall_names: Box<Fn(ir::LibCall) -> String>,
}
impl FaerieBuilder {
pub fn new(
isa: Box<TargetIsa>,
name: String,
collect_traps: FaerieTrapCollection,
libcall_names: Box<Fn(ir::LibCall) -> String>,
) -> ModuleResult<Self> {
if !isa.flags().is_pic() {
return Err(ModuleError::Backend(
"faerie requires TargetIsa be PIC".to_owned(),
));
}
Ok(Self {
isa,
name,
collect_traps,
libcall_names,
})
}
pub fn default_libcall_names() -> Box<Fn(ir::LibCall) -> String> {
Box::new(move |libcall| match libcall {
ir::LibCall::Probestack => "__cretonne_probestack".to_owned(),
ir::LibCall::CeilF32 => "ceilf".to_owned(),
ir::LibCall::CeilF64 => "ceil".to_owned(),
ir::LibCall::FloorF32 => "floorf".to_owned(),
ir::LibCall::FloorF64 => "floor".to_owned(),
ir::LibCall::TruncF32 => "truncf".to_owned(),
ir::LibCall::TruncF64 => "trunc".to_owned(),
ir::LibCall::NearestF32 => "nearbyintf".to_owned(),
ir::LibCall::NearestF64 => "nearbyint".to_owned(),
})
}
}
pub struct FaerieBackend {
isa: Box<TargetIsa>,
artifact: faerie::Artifact,
trap_manifest: Option<FaerieTrapManifest>,
libcall_names: Box<Fn(ir::LibCall) -> String>,
}
pub struct FaerieCompiledFunction {}
pub struct FaerieCompiledData {}
impl Backend for FaerieBackend {
type Builder = FaerieBuilder;
type CompiledFunction = FaerieCompiledFunction;
type CompiledData = FaerieCompiledData;
type FinalizedFunction = ();
type FinalizedData = ();
type Product = FaerieProduct;
fn new(builder: FaerieBuilder) -> Self {
Self {
artifact: faerie::Artifact::new(builder.isa.triple().clone(), builder.name),
isa: builder.isa,
trap_manifest: match builder.collect_traps {
FaerieTrapCollection::Enabled => Some(FaerieTrapManifest::new()),
FaerieTrapCollection::Disabled => None,
},
libcall_names: builder.libcall_names,
}
}
fn isa(&self) -> &TargetIsa {
&*self.isa
}
fn declare_function(&mut self, name: &str, linkage: Linkage) {
self.artifact
.declare(name, translate_function_linkage(linkage))
.expect("inconsistent declarations");
}
fn declare_data(&mut self, name: &str, linkage: Linkage, writable: bool) {
self.artifact
.declare(name, translate_data_linkage(linkage, writable))
.expect("inconsistent declarations");
}
fn define_function(
&mut self,
name: &str,
ctx: &cretonne_codegen::Context,
namespace: &ModuleNamespace<Self>,
code_size: u32,
) -> ModuleResult<FaerieCompiledFunction> {
let mut code: Vec<u8> = Vec::with_capacity(code_size as usize);
code.resize(code_size as usize, 0);
{
let mut reloc_sink = FaerieRelocSink {
triple: self.isa.triple().clone(),
artifact: &mut self.artifact,
name,
namespace,
libcall_names: &self.libcall_names,
};
if let Some(ref mut trap_manifest) = self.trap_manifest {
let mut trap_sink = FaerieTrapSink::new(name, code_size);
unsafe {
ctx.emit_to_memory(
&*self.isa,
code.as_mut_ptr(),
&mut reloc_sink,
&mut trap_sink,
)
};
trap_manifest.add_sink(trap_sink);
} else {
let mut trap_sink = NullTrapSink {};
unsafe {
ctx.emit_to_memory(
&*self.isa,
code.as_mut_ptr(),
&mut reloc_sink,
&mut trap_sink,
)
};
}
}
self.artifact
.define(name, code)
.expect("inconsistent declaration");
Ok(FaerieCompiledFunction {})
}
fn define_data(
&mut self,
name: &str,
data_ctx: &DataContext,
namespace: &ModuleNamespace<Self>,
) -> ModuleResult<FaerieCompiledData> {
let &DataDescription {
writable: _writable,
ref init,
ref function_decls,
ref data_decls,
ref function_relocs,
ref data_relocs,
} = data_ctx.description();
let size = init.size();
let mut bytes = Vec::with_capacity(size);
match *init {
Init::Uninitialized => {
panic!("data is not initialized yet");
}
Init::Zeros { .. } => {
bytes.resize(size, 0);
}
Init::Bytes { ref contents } => {
bytes.extend_from_slice(contents);
}
}
for &(offset, id) in function_relocs {
let to = &namespace.get_function_decl(&function_decls[id]).name;
self.artifact
.link(faerie::Link {
from: name,
to,
at: offset as usize,
})
.map_err(|e| ModuleError::Backend(e.to_string()))?;
}
for &(offset, id, addend) in data_relocs {
debug_assert_eq!(
addend, 0,
"faerie doesn't support addends in data section relocations yet"
);
let to = &namespace.get_data_decl(&data_decls[id]).name;
self.artifact
.link(faerie::Link {
from: name,
to,
at: offset as usize,
})
.map_err(|e| ModuleError::Backend(e.to_string()))?;
}
self.artifact
.define(name, bytes)
.expect("inconsistent declaration");
Ok(FaerieCompiledData {})
}
fn write_data_funcaddr(
&mut self,
_data: &mut FaerieCompiledData,
_offset: usize,
_what: ir::FuncRef,
) {
unimplemented!()
}
fn write_data_dataaddr(
&mut self,
_data: &mut FaerieCompiledData,
_offset: usize,
_what: ir::GlobalValue,
_usize: binemit::Addend,
) {
unimplemented!()
}
fn finalize_function(
&mut self,
_func: &FaerieCompiledFunction,
_namespace: &ModuleNamespace<Self>,
) {
}
fn finalize_data(&mut self, _data: &FaerieCompiledData, _namespace: &ModuleNamespace<Self>) {
}
fn finish(self) -> FaerieProduct {
FaerieProduct {
artifact: self.artifact,
trap_manifest: self.trap_manifest,
}
}
}
pub struct FaerieProduct {
pub artifact: faerie::Artifact,
pub trap_manifest: Option<FaerieTrapManifest>,
}
impl FaerieProduct {
pub fn name(&self) -> &str {
&self.artifact.name
}
pub fn emit(&self) -> Result<Vec<u8>, Error> {
self.artifact.emit()
}
pub fn write(&self, sink: File) -> Result<(), Error> {
self.artifact.write(sink)
}
}
fn translate_function_linkage(linkage: Linkage) -> faerie::Decl {
match linkage {
Linkage::Import => faerie::Decl::FunctionImport,
Linkage::Local => faerie::Decl::Function { global: false },
Linkage::Preemptible | Linkage::Export => faerie::Decl::Function { global: true },
}
}
fn translate_data_linkage(linkage: Linkage, writable: bool) -> faerie::Decl {
match linkage {
Linkage::Import => faerie::Decl::DataImport,
Linkage::Local => faerie::Decl::Data {
global: false,
writeable: writable,
},
Linkage::Export => faerie::Decl::Data {
global: true,
writeable: writable,
},
Linkage::Preemptible => {
unimplemented!("faerie doesn't support preemptible globals yet");
}
}
}
struct FaerieRelocSink<'a> {
triple: Triple,
artifact: &'a mut faerie::Artifact,
name: &'a str,
namespace: &'a ModuleNamespace<'a, FaerieBackend>,
libcall_names: &'a Box<Fn(ir::LibCall) -> String>,
}
impl<'a> RelocSink for FaerieRelocSink<'a> {
fn reloc_ebb(&mut self, _offset: CodeOffset, _reloc: Reloc, _ebb_offset: CodeOffset) {
unimplemented!();
}
fn reloc_external(
&mut self,
offset: CodeOffset,
reloc: Reloc,
name: &ir::ExternalName,
addend: Addend,
) {
let ref_name: String = match name {
&ir::ExternalName::User { .. } => {
if self.namespace.is_function(name) {
self.namespace.get_function_decl(name).name.clone()
} else {
self.namespace.get_data_decl(name).name.clone()
}
}
&ir::ExternalName::LibCall(ref libcall) => {
let sym = (self.libcall_names)(*libcall);
self.artifact
.declare(sym.clone(), faerie::Decl::FunctionImport)
.expect("faerie declaration of libcall");
sym
}
_ => panic!("invalid ExternalName {}", name),
};
let (raw_reloc, raw_addend) = container::raw_relocation(reloc, &self.triple);
let final_addend = addend + raw_addend;
let addend_i32 = final_addend as i32;
debug_assert!(i64::from(addend_i32) == final_addend);
self.artifact
.link_with(
faerie::Link {
from: self.name,
to: &ref_name,
at: offset as usize,
},
faerie::RelocOverride {
reloc: raw_reloc,
addend: addend_i32,
},
)
.expect("faerie relocation error");
}
fn reloc_jt(&mut self, _offset: CodeOffset, _reloc: Reloc, _jt: ir::JumpTable) {
unimplemented!();
}
}