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Better allocator for wasm (#1460)

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* Add Arch Linux installation instructions

* Enable tracing heap size

* Extract heap

* Replace linear allocator with buddy allocator

* Fix test

The purose of this big block is for the tests
to test a failure when the block is too big
though. The improved buddy allocation strategy
results in this block fitting on the heap now.
Hence the increase.

* Get rid of memcpy in to_vec()

* fixup: Style and comments

* fixup: Split Linux instructions by distribution

To prevent misunderstandings of people executing both.

* fixup: Remove unnecessary types and code

* fixup: Make Pointers start from 1, remove some panics, code improvements

* fixup: Return 0 on errors

* fixup: Move loop to separate function

* fixup: Use FnvHashMap instead of HashMap

* fixup: Fix error handling

* fixup: Use current_size() instead of used_size()

* fixup: Fix and document allocation offset

* fixup: Remove unnecessary multiplication

* fixup: Fix comments

* fixup: Remove Arch installation instructions

* Revert "Fix test"

This reverts commit 292c177df8efaa4658293748a13b1ab1c0b76ea8.

* fixup: Remove unused code, improve import

* fixup: Proper alignment

* fixup: Do not use internal constant in public description

* fixup: Add comment regarding invariants

* fixup: Move assertion to compile-time check
This commit is contained in:
Michael Müller
2019-01-18 17:29:47 +01:00
committed by Sergei Pepyakin
parent b066d25cc7
commit 1ccb590d18
6 changed files with 400 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files
substrate/core/sr-io/without_std.rs
+8 -6
View File
@@ -132,9 +132,10 @@ pub fn storage(key: &[u8]) -> Option<Vec<u8>> {
if length == u32::max_value() {
None
} else {
let ret = slice::from_raw_parts(ptr, length as usize).to_vec();
ext_free(ptr);
Some(ret)
// Invariants required by Vec::from_raw_parts are not formally fulfilled.
// We don't allocate via String/Vec<T>, but use a custom allocator instead.
// See #300 for more details.
Some(<Vec<u8>>::from_raw_parts(ptr, length as usize, length as usize))
}
}
}
@@ -147,9 +148,10 @@ pub fn child_storage(storage_key: &[u8], key: &[u8]) -> Option<Vec<u8>> {
if length == u32::max_value() {
None
} else {
let ret = slice::from_raw_parts(ptr, length as usize).to_vec();
ext_free(ptr);
Some(ret)
// Invariants required by Vec::from_raw_parts are not formally fulfilled.
// We don't allocate via String/Vec<T>, but use a custom allocator instead.
// See #300 for more details.
Some(<Vec<u8>>::from_raw_parts(ptr, length as usize, length as usize))
}
}
}