Get number constant reading working

.gitignore

@@ -1 +1,2 @@
 *.luo
+lunaclib.so

build.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+cc -shared $(pkg-config --cflags luajit) lunaclib.c $(pkg-config --libs luajit) -o lunaclib.so
+

lunaclib.c

@@ -0,0 +1,31 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <lua.h>
+#include <lauxlib.h>
+
+static int u64_to_num(lua_State* L) {
+    #ifndef LUA_NUMBER_DOUBLE
+    #error Lua must be compiled with number as a double floating point
+    #endif
+
+    const uint64_t h1 = luaL_checkint(L, 1);
+    const uint64_t h2 = luaL_checkint(L, 2);
+
+    const uint64_t stacked = (h2 << 32) | h1;
+
+    double res = *(double *)((char *)&stacked);
+    lua_pushnumber(L, res);
+
+    return 1;
+}
+
+static const struct luaL_Reg lib[] = {
+    {"u64_to_num", u64_to_num},
+    {NULL, NULL}
+};
+
+int luaopen_lunaclib(lua_State *L) {
+    luaL_openlib(L, "lunaclib", lib, 0);
+    return 1;
+}
+

lunajit.lua

@@ -2,7 +2,7 @@ local readbc = require('readbc')
 local vm = require('vm')
 local VM = vm.VM
 
-fp = io.open('tests/test1.luo')
+fp = io.open('snippets/test1.luo')
 header = readbc.read_header(fp)
 proto = readbc.read_proto(fp)
 fp:close()

opcodes.lua

@@ -68,9 +68,9 @@ local Metamethod = {
 }
 
 local Opcodes_defs = gen_opcodes {
-    opcode(37, 'POW', Mode.dst, Mode.none, Mode.lits, Metamethod.none),
-    opcode(41, 'KSHORT', Mode.dst, Mode.var, Mode.var, Metamethod.pow),
-    opcode(75, 'RET0', Mode.rbase, Mode.none, Mode.lit, Mode.none),
+    opcode(0x25, 'POW', Mode.dst, Mode.none, Mode.lits, Metamethod.none),
+    opcode(0x29, 'KSHORT', Mode.dst, Mode.var, Mode.var, Metamethod.pow),
+    opcode(0x4b, 'RET0', Mode.rbase, Mode.none, Mode.lit, Mode.none),
 }
 
 local function decode(ins)

readbc.lua

@@ -1,6 +1,8 @@
 -- module for reading serialized lua bytecode
 
-local bit=require('bit')
+local bit = require('bit')
+local lunaclib = require('lunaclib')
+local u64_to_num = lunaclib.u64_to_num
 
 local HEADER_MAGIC = {27, string.byte('L'), string.byte('J')}
 local FLAG_STRIP = 0x02
@@ -53,6 +55,7 @@ local function read_uleb128(fp)
     while not last_byte do
         local uleb_byte = read_u8(fp)
         res = bit.bor(res, bit.lshift(bit.band(uleb_byte, 0x7f), shift))
+        shift = shift + 7
 
         if bit.band(uleb_byte, 0x80) == 0 then
             last_byte = true
@@ -124,7 +127,16 @@ local function read_proto(fp)
     local bcins = read_u32n(fp, numbc)
     local uvdata = read_u16n(fp, numuv)
     -- local kgc
-    -- local numkn
+    local num = {}
+    for i = 1, numkn do
+        local x = read_uleb128(fp)
+        if bit.band(x, 1) == 1 then
+            local y = read_uleb128(fp)
+            num[i] = u64_to_num(x, y)
+        else
+            num[i] = (x/2)-1
+        end
+    end
     -- local debug = fp:read(debugLen)
 
     -- TODO: remove when reading of kgc, numkn and debug is implemented

snippets/test5.lua

@@ -0,0 +1,3 @@
+local num = 2^15+1
+local num64 = 2^32
+local fp = 0.75