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Merge pull request #986 from alexcrichton/gc-types

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Eliminate duplicate types in the type section
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Alex Crichton 2018-10-29 14:11:58 -07:00 committed by GitHub
commit a0a9ed4686
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2 changed files with 13 additions and 7 deletions
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2
crates/gc/Cargo.toml
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@ -11,6 +11,6 @@ Support for removing unused items from a wasm executable
"""
[dependencies]
parity-wasm = "0.35"
parity-wasm = "0.35.1"
log = "0.4"
rustc-demangle = "0.1.9"

18
crates/gc/src/lib.rs
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@ -8,7 +8,7 @@ extern crate parity_wasm;
extern crate log;
extern crate rustc_demangle;
use std::collections::HashSet;
use std::collections::{HashSet, HashMap};
use std::iter;
use std::mem;
@ -474,14 +474,20 @@ impl<'a> RemapContext<'a> {
let mut memories = Vec::new();
if let Some(s) = m.type_section() {
let mut removed = 0;
for i in 0..(s.types().len() as u32) {
if analysis.types.contains(&i) {
types.push(i - removed);
let mut ntypes = 0;
let mut map = HashMap::new();
for (i, ty) in s.types().iter().enumerate() {
if analysis.types.contains(&(i as u32)) {
if let Some(prev) = map.get(&ty) {
types.push(*prev);
continue
}
map.insert(ty, ntypes);
types.push(ntypes);
ntypes += 1;
} else {
debug!("gc type {}", i);
types.push(u32::max_value());
removed += 1;
}
}
}