File Coverage

/usr/local/lib/perl5/site_perl/5.26.1/x86_64-linux/XS/libpanda.x/i/panda/cast.h

Criterion	Covered	Total	%
statement	17	17	100.0
branch	194	438	44.2
condition			n/a
subroutine			n/a
pod			n/a
total	211	455	46.3

line	stmt	bran	code
1			#pragma once
2			#include
3			#include
4			#include
5			#include
6			#include
7
8			namespace panda {
9
10			namespace detail { namespace cast {
11			typedef std::map DynCastCacheMap;
12
13			template
14	292		DynCastCacheMap& get_map () {
15			thread_local DynCastCacheMap* map;
16	292	50	if (!map) {
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17	185	50	thread_local struct { DynCastCacheMap map; } wrp;
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18	37		map = &wrp.map;
19			}
20	292		return *map;
21			}
22
23			constexpr const ptrdiff_t INCORRECT_PTRDIFF = PTRDIFF_MAX;
24			}}
25
26			template
27	1676		DERIVED_PTR dyn_cast (BASE* obj) {
28			using namespace detail::cast;
29			using DERIVED = typename std::remove_pointer::type;
30
31	1092		if (std::is_same::value) return (DERIVED_PTR)((void*)obj);
32	292	50	if (!obj) return NULL;
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33
34	292	50	intptr_t key = (intptr_t)typeid(*obj).name();
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35	292		auto& map = get_map();
36			//auto& map = DynCastCache::map;
37	292	50	DynCastCacheMap::iterator it = map.find(key);
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38	292	50	if (it != map.end())
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39	228	0	return it->second != INCORRECT_PTRDIFF ? reinterpret_cast((char*)obj - it->second) : NULL;
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40	61	50	DERIVED* ret = dynamic_cast(obj);
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41	64	50	if (ret) map[key] = (char)obj - (char)ret;
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42	15	0	else map[key] = INCORRECT_PTRDIFF;
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43	292		return ret;
44			}
45
46			template
47			DERIVED_REF dyn_cast (BASE& obj) {
48			using namespace detail::cast;
49			using DERIVED = typename std::remove_reference::type;
50
51			if (std::is_same::value) return reinterpret_cast(obj);
52
53			intptr_t key = (intptr_t)typeid(obj).name();
54			auto& map = get_map();
55			DynCastCacheMap::iterator it = map.find(key);
56			if (it != map.end() && it->second != INCORRECT_PTRDIFF)
57			return (reinterpret_cast((char)&obj - it->second));
58			// dont cache fails, as exceptions are much slower than dynamic_cast, let it always fall here
59			DERIVED& ret = dynamic_cast(obj);
60			map[key] = (char)&obj - (char)&ret;
61			return ret;
62			}
63
64			}