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use std;
use super::{
CREATE_SYMBOL,
CALL_SYMBOL,
optimize,
pack_instance,
ununderscore_funcs,
externalize_mem,
shrink_unknown_stack,
inject_runtime_type,
PackingError,
OptimizerError,
};
use parity_wasm;
use parity_wasm::elements;
#[derive(Debug)]
pub enum Error {
Encoding(elements::Error),
Packing(PackingError),
NoCreateSymbolFound,
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),
NoCreateSymbolFound => write!(f, "Packing failed: no \"{}\" symbol found?", CREATE_SYMBOL),
}
}
}
fn has_ctor(module: &elements::Module) -> bool {
if let Some(ref section) = module.export_section() {
section.entries().iter().any(|e| CREATE_SYMBOL == e.field())
} else {
false
}
}
pub fn build(
mut module: elements::Module,
constructor: bool,
source_target: SourceTarget,
runtime_type_version: Option<([u8; 4], u32)>,
public_api_entries: &[&str],
enforce_stack_adjustment: bool,
stack_size: u32,
skip_optimization: bool,
) -> 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(CALL_SYMBOL);
if !skip_optimization {
optimize(
&mut module,
public_api_entries,
)?;
}
if constructor {
if !has_ctor(&ctor_module) {
Err(Error::NoCreateSymbolFound)?
}
if !skip_optimization {
optimize(&mut ctor_module, vec![CREATE_SYMBOL])?;
}
let ctor_module = pack_instance(
parity_wasm::serialize(module.clone()).map_err(Error::Encoding)?,
ctor_module.clone(),
)?;
Ok((module, Some(ctor_module)))
} else {
Ok((module, None))
}
}