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
use std;
use super::{
optimize,
pack_instance,
ununderscore_funcs,
externalize_mem,
shrink_unknown_stack,
inject_runtime_type,
PackingError,
OptimizerError,
TargetRuntime,
};
use susy_wasm;
use susy_wasm::elements;
#[derive(Debug)]
pub enum Error {
Encoding(elements::Error),
Packing(PackingError),
Optimizer,
}
impl From<OptimizerError> for Error {
fn from(_err: OptimizerError) -> Self {
Error::Optimizer
}
}
impl From<PackingError> for Error {
fn from(err: PackingError) -> Self {
Error::Packing(err)
}
}
#[derive(Debug, Clone, Copy)]
pub enum SourceTarget {
Emscripten,
Unknown,
}
impl std::fmt::Display for Error {
fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
use self::Error::*;
match *self {
Encoding(ref err) => write!(f, "Encoding error ({})", err),
Optimizer => write!(f, "Optimization error due to missing export section. Pointed wrong file?"),
Packing(ref e) => write!(f, "Packing failed due to module structure error: {}. Sure used correct libraries for building contracts?", e),
}
}
}
fn has_ctor(module: &elements::Module, target_runtime: &TargetRuntime) -> bool {
if let Some(ref section) = module.export_section() {
section.entries().iter().any(|e| target_runtime.symbols().create == e.field())
} else {
false
}
}
pub fn build(
mut module: elements::Module,
source_target: SourceTarget,
runtime_type_version: Option<([u8; 4], u32)>,
public_api_entries: &[&str],
enforce_stack_adjustment: bool,
stack_size: u32,
skip_optimization: bool,
target_runtime: &TargetRuntime,
) -> Result<(elements::Module, Option<elements::Module>), Error> {
if let SourceTarget::Emscripten = source_target {
module = ununderscore_funcs(module);
}
if let SourceTarget::Unknown = source_target {
if enforce_stack_adjustment {
assert!(stack_size <= 1024*1024);
let (new_module, new_stack_top) = shrink_unknown_stack(module, 1024 * 1024 - stack_size);
module = new_module;
let mut stack_top_page = new_stack_top / 65536;
if new_stack_top % 65536 > 0 { stack_top_page += 1 };
module = externalize_mem(module, Some(stack_top_page), 16);
} else {
module = externalize_mem(module, None, 16);
}
}
if let Some(runtime_type_version) = runtime_type_version {
let (runtime_type, runtime_version) = runtime_type_version;
module = inject_runtime_type(module, runtime_type, runtime_version);
}
let mut ctor_module = module.clone();
let mut public_api_entries = public_api_entries.to_vec();
public_api_entries.push(target_runtime.symbols().call);
if !skip_optimization {
optimize(&mut module, public_api_entries)?;
}
if !has_ctor(&ctor_module, target_runtime) {
return Ok((module, None))
}
if !skip_optimization {
let preserved_exports = match target_runtime {
TargetRuntime::PWasm(_) => vec![target_runtime.symbols().call],
TargetRuntime::Substrate(_) => vec![target_runtime.symbols().call, target_runtime.symbols().create],
};
optimize(&mut ctor_module, preserved_exports)?;
}
if let TargetRuntime::PWasm(_) = target_runtime {
ctor_module = pack_instance(
susy_wasm::serialize(module.clone()).map_err(Error::Encoding)?,
ctor_module.clone(),
target_runtime,
)?;
}
Ok((module, Some(ctor_module)))
}