bjoernager/rust
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Auto merge of #83682 - bjorn3:mmap_wrapper, r=cjgillot

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Add an Mmap wrapper to rustc_data_structures

This wrapper implements StableAddress and falls back to directly reading the file on wasm32.

Taken from #83640, which I will close due to the perf regression.
This commit is contained in:
bors 2021-04-03 13:23:42 +00:00
commit 97717a5618
12 changed files with 63 additions and 50 deletions
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3
compiler/rustc_codegen_ssa/src/back/write.rs
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@ -10,6 +10,7 @@ use crate::{
use crate::traits::*;
use jobserver::{Acquired, Client};
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::memmap::Mmap;
use rustc_data_structures::profiling::SelfProfilerRef;
use rustc_data_structures::profiling::TimingGuard;
use rustc_data_structures::profiling::VerboseTimingGuard;
@ -1958,7 +1959,7 @@ pub fn submit_pre_lto_module_to_llvm<B: ExtraBackendMethods>(
.unwrap_or_else(|e| panic!("failed to open bitcode file `{}`: {}", bc_path.display(), e));
let mmap = unsafe {
memmap2::Mmap::map(&file).unwrap_or_else(|e| {
Mmap::map(file).unwrap_or_else(|e| {
panic!("failed to mmap bitcode file `{}`: {}", bc_path.display(), e)
})
};