cerc-io/solidity
11
0
Fork 0
mirror of https://github.com/ethereum/solidity synced 2023-10-03 13:03:40 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Add LEB128 encoding functions & tests.

Browse Source
This commit is contained in:
Alexander Arlt
2020-09-28 16:06:19 -05:00
parent dd5b0a715c
commit b6e1415509
5 changed files with 163 additions and 22 deletions
Download Patch File Download Diff File Expand all files Collapse all files
libyul/backends/wasm/BinaryTransform.cpp
+1 -22
View File
@@ -24,6 +24,7 @@
#include <libyul/Exceptions.h>
#include <libsolutil/CommonData.h>
#include <libsolutil/Visitor.h>
#include <libsolutil/LEB128.h>
#include <boost/range/adaptor/reversed.hpp>
#include <boost/range/adaptor/map.hpp>
@@ -239,28 +240,6 @@ static map<string, uint8_t> const builtins = {
{"i64.extend_i32_u", 0xad},
};
bytes lebEncode(uint64_t _n)
{
bytes encoded;
while (_n > 0x7f)
{
encoded.emplace_back(uint8_t(0x80 | (_n & 0x7f)));
_n >>= 7;
}
encoded.emplace_back(_n);
return encoded;
}
bytes lebEncodeSigned(int64_t _n)
{
if (_n >= 0 && _n < 0x40)
return toBytes(uint8_t(uint64_t(_n) & 0xff));
else if (-_n > 0 && -_n < 0x40)
return toBytes(uint8_t(uint64_t(_n + 0x80) & 0xff));
else
return toBytes(uint8_t(0x80 | uint8_t(_n & 0x7f))) + lebEncodeSigned(_n / 0x80);
}
bytes prefixSize(bytes _data)
{
size_t size = _data.size();