Showing the changes to src/include (2 of 3 files). Show all
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| @@ -166,6 +166,7 @@ namespace disvm · 165 unmodified lines | ||
| 166 | 166 | // Returns this string. |
| 167 | 167 | vm_string_t &append(const vm_string_t &other); |
| 168 | 168 | |
| 169 | + // Returns the character length of the string. | |
| 169 | 170 | word_t get_length() const; |
| 170 | 171 | |
| 171 | 172 | rune_t get_rune(word_t index) const; |
| @@ -9,6 +9,7 @@ · 8 unmodified lines | ||
| 9 | 9 | |
| 10 | 10 | #include <cstdint> |
| 11 | 11 | #include <cassert> |
| 12 | +#include <limits> | |
| 12 | 13 | #include <mutex> |
| 13 | 14 | #include <memory> |
| 14 | 15 | #include <bitset> |
| @@ -89,7 +90,7 @@ namespace disvm · 74 unmodified lines | ||
| 89 | 90 | { |
| 90 | 91 | const auto flags = std::bitset<sizeof(words8) * 8>{ words8 }; |
| 91 | 92 | |
| 92 | − // Enumerating the flags in reverse order so memory access is linear. | |
| 93 | + // Enumerating the flags in reverse order so memory access is sequential. | |
| 93 | 94 | if (flags[7] && (memory[0] != runtime_constants::nil)) callback(reinterpret_cast<pointer_t>(memory[0])); |
| 94 | 95 | if (flags[6] && (memory[1] != runtime_constants::nil)) callback(reinterpret_cast<pointer_t>(memory[1])); |
| 95 | 96 | if (flags[5] && (memory[2] != runtime_constants::nil)) callback(reinterpret_cast<pointer_t>(memory[2])); |
| @@ -101,6 +102,30 @@ namespace disvm · 5 unmodified lines | ||
| 101 | 102 | } |
| 102 | 103 | } |
| 103 | 104 | } |
| 105 | + | |
| 106 | + // Check if a specific pointer-sized offset in a type represents a pointer | |
| 107 | + inline bool is_offset_pointer(const type_descriptor_t &type_desc, std::size_t offset) | |
| 108 | + { | |
| 109 | + if (type_desc.size_in_bytes == 0) | |
| 110 | + return false; | |
| 111 | + | |
| 112 | + assert(offset < static_cast<std::size_t>(std::numeric_limits<word_t>::max())); | |
| 113 | + const auto byte_offset = static_cast<word_t>(offset / 8); | |
| 114 | + | |
| 115 | + // Highest order bit is the first field | |
| 116 | + const auto bit_offset = 7 - (offset % 8); | |
| 117 | + if (byte_offset < type_desc.map_in_bytes) | |
| 118 | + { | |
| 119 | + const auto words8 = type_desc.pointer_map[byte_offset]; | |
| 120 | + if (words8 != 0) | |
| 121 | + { | |
| 122 | + const auto flags = std::bitset<sizeof(words8) * 8>{ words8 }; | |
| 123 | + return flags[bit_offset]; | |
| 124 | + } | |
| 125 | + } | |
| 126 | + | |
| 127 | + return false; | |
| 128 | + } | |
| 104 | 129 | } |
| 105 | 130 | } |
| 106 | 131 | |