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Implement built-in for bit32.byteswap

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Dekkonot 2023-10-16 17:56:25 -07:00
parent e34b0160f1
commit f6c07e2032
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3 changed files with 30 additions and 0 deletions
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3
Common/include/Luau/Bytecode.h
View file

@ -560,6 +560,9 @@ enum LuauBuiltinFunction
// tonumber/tostring
LBF_TONUMBER,
LBF_TOSTRING,
// bit32.byteswap(n)
LBF_BIT32_BYTESWAP,
};
// Capture type, used in LOP_CAPTURE

10
Compiler/src/Builtins.cpp
View file

@ -4,6 +4,8 @@
#include "Luau/Bytecode.h"
#include "Luau/Compiler.h"
LUAU_FASTFLAG(LuauBit32ByteswapBuiltin)
namespace Luau
{
namespace Compile
@ -166,6 +168,11 @@ static int getBuiltinFunctionId(const Builtin& builtin, const CompileOptions& op
return LBF_BIT32_COUNTLZ;
if (builtin.method == "countrz")
return LBF_BIT32_COUNTRZ;
if (builtin.method == "byteswap")
{
LUAU_ASSERT(FFlag::LuauBit32ByteswapBuiltin);
return LBF_BIT32_BYTESWAP;
}
}
if (builtin.object == "string")
@ -402,6 +409,9 @@ BuiltinInfo getBuiltinInfo(int bfid)
case LBF_TOSTRING:
return {1, 1};
case LBF_BIT32_BYTESWAP:
return {1, 1, BuiltinInfo::Flag_NoneSafe};
};
LUAU_UNREACHABLE();

17
VM/src/lbuiltins.cpp
View file

@ -1319,6 +1319,21 @@ static int luauF_tostring(lua_State* L, StkId res, TValue* arg0, int nresults, S
return -1;
}
static int luauF_byteswap(lua_State* L, StkId res, TValue* arg0, int nresults, StkId args, int nparams)
{
if (nparams >= 1 && nresults <= 1 && ttisnumber(arg0))
{
double a1 = nvalue(arg0);
unsigned n;
luai_num2unsigned(n, a1);
setnvalue(res, double(((n >> 24) & 0xff) | ((n << 8) & 0xff0000) | ((n >> 8) & 0xff00) | ((n << 24) & 0xff000000)));
return 1;
}
return -1;
}
static int luauF_missing(lua_State* L, StkId res, TValue* arg0, int nresults, StkId args, int nparams)
{
return -1;
@ -1486,6 +1501,8 @@ const luau_FastFunction luauF_table[256] = {
luauF_tonumber,
luauF_tostring,
luauF_byteswap,
// When adding builtins, add them above this line; what follows is 64 "dummy" entries with luauF_missing fallback.
// This is important so that older versions of the runtime that don't support newer builtins automatically fall back via luauF_missing.
// Given the builtin addition velocity this should always provide a larger compatibility window than bytecode versions suggest.