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includes/type: Add signed LEB128 type support (#86)

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Chris
2023-02-17 20:35:27 +01:00
committed by GitHub
parent 0673673b99
commit 15234a284d
1 changed files with 31 additions and 9 deletions
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40
includes/type/leb128.pat
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@@ -5,29 +5,51 @@
namespace type { namespace type {
struct LEB128 { struct _LEB128 {
u8 array[while($ == addressof(this) || std::mem::read_unsigned($-1, 1) & 0x80 != 0)] [[hidden]]; u8 array[while($ == addressof(this) || std::mem::read_unsigned($-1, 1) & 0x80 != 0)] [[hidden]];
} [[sealed, format("type::impl::format_leb128"), transform("type::impl::transform_leb128")]]; } [[sealed]];
using uLEB128 = _LEB128 [[format("type::impl::format_uleb128"), transform("type::impl::transform_uleb128")]];
using sLEB128 = _LEB128 [[format("type::impl::format_sleb128"), transform("type::impl::transform_sleb128")]];
using LEB128 = uLEB128;
namespace impl { namespace impl {
fn transform_leb128_array(auto array) { fn transform_uleb128_array(auto array) {
u128 res = array[0] & 0x7f; u128 res = array[0] & 0x7f;
for(u8 i = 1, array[i-1] & 0x80 != 0, i+=1) { for(u8 i = 1, array[i-1] & 0x80 != 0, i+=1) {
res |= u64(array[i] & 0x7f) << 7 * i; res |= u128(array[i] & 0x7f) << 7 * i;
}
return res;
};
fn transform_sleb128_array(auto array) {
s128 res = type::impl::transform_uleb128_array(array);
if (res & 0x40 != 0) {
res |= ~0 << (sizeof(array) / sizeof(u8)) * 7;
} }
return res; return res;
}; };
fn format_leb128(auto leb128) { fn format_uleb128(auto leb128) {
u128 res = type::impl::transform_leb128_array(leb128.array); u128 res = type::impl::transform_uleb128_array(leb128.array);
return std::format("{} ({:#x})", res, res); return std::format("{} ({:#x})", res, res);
}; };
fn transform_leb128(auto leb128) { fn transform_uleb128(auto leb128) {
return type::impl::transform_leb128_array(leb128.array); return type::impl::transform_uleb128_array(leb128.array);
}; };
fn format_sleb128(auto leb128) {
s128 res = type::impl::transform_sleb128_array(leb128.array);
return std::format("{} ({:#x})", res, res);
};
fn transform_sleb128(auto leb128) {
return type::impl::transform_sleb128_array(leb128.array);
};
} }
} }