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| 1 | +/** |
| 2 | + * This module implements the runtime-part of LDC exceptions |
| 3 | + * on Windows win32. |
| 4 | + */ |
| 5 | +module ldc.eh.win32; |
| 6 | + |
| 7 | +version(CRuntime_Microsoft): |
| 8 | +version(Win32): |
| 9 | + |
| 10 | +import ldc.eh.common; |
| 11 | +import core.sys.windows.windows; |
| 12 | +import core.exception : onOutOfMemoryError; |
| 13 | +import core.stdc.stdlib : malloc; |
| 14 | +import core.stdc.string : memcpy; |
| 15 | + |
| 16 | +// pointers are image relative for Win64 versions |
| 17 | +version(Win64) |
| 18 | + alias ImgPtr(T) = uint; // offset into image |
| 19 | +else |
| 20 | + alias ImgPtr(T) = T; |
| 21 | + |
| 22 | +alias PMFN = ImgPtr!(void function(void*)); |
| 23 | + |
| 24 | +struct TypeDescriptor(int N) |
| 25 | +{ |
| 26 | + version(_RTTI) |
| 27 | + const void * pVFTable; // Field overloaded by RTTI |
| 28 | + else |
| 29 | + uint hash; // Hash value computed from type's decorated name |
| 30 | + |
| 31 | + void * spare; // reserved, possible for RTTI |
| 32 | + char[N+1] name; // variable size, zero terminated |
| 33 | +} |
| 34 | + |
| 35 | +struct PMD |
| 36 | +{ |
| 37 | + int mdisp; // Offset of intended data within base |
| 38 | + int pdisp; // Displacement to virtual base pointer |
| 39 | + int vdisp; // Index within vbTable to offset of base |
| 40 | +} |
| 41 | + |
| 42 | +struct CatchableType |
| 43 | +{ |
| 44 | + uint properties; // Catchable Type properties (Bit field) |
| 45 | + ImgPtr!(TypeDescriptor!1*) pType; // Pointer to TypeDescriptor |
| 46 | + PMD thisDisplacement; // Pointer to instance of catch type within thrown object. |
| 47 | + int sizeOrOffset; // Size of simple-type object or offset into buffer of 'this' pointer for catch object |
| 48 | + PMFN copyFunction; // Copy constructor or CC-closure |
| 49 | +} |
| 50 | + |
| 51 | +enum CT_IsSimpleType = 0x00000001; // type is a simple type (includes pointers) |
| 52 | +enum CT_ByReferenceOnly = 0x00000002; // type must be caught by reference |
| 53 | +enum CT_HasVirtualBase = 0x00000004; // type is a class with virtual bases |
| 54 | +enum CT_IsWinRTHandle = 0x00000008; // type is a winrt handle |
| 55 | +enum CT_IsStdBadAlloc = 0x00000010; // type is a a std::bad_alloc |
| 56 | + |
| 57 | +struct CatchableTypeArray |
| 58 | +{ |
| 59 | + int nCatchableTypes; |
| 60 | + ImgPtr!(CatchableType*)[2] arrayOfCatchableTypes; |
| 61 | +} |
| 62 | + |
| 63 | +struct _ThrowInfo |
| 64 | +{ |
| 65 | + uint attributes; // Throw Info attributes (Bit field) |
| 66 | + PMFN pmfnUnwind; // Destructor to call when exception has been handled or aborted. |
| 67 | + PMFN pForwardCompat; // pointer to Forward compatibility frame handler |
| 68 | + ImgPtr!(CatchableTypeArray*) pCatchableTypeArray; // pointer to CatchableTypeArray |
| 69 | +} |
| 70 | + |
| 71 | +enum TI_IsConst = 0x00000001; // thrown object has const qualifier |
| 72 | +enum TI_IsVolatile = 0x00000002; // thrown object has volatile qualifier |
| 73 | +enum TI_IsUnaligned = 0x00000004; // thrown object has unaligned qualifier |
| 74 | +enum TI_IsPure = 0x00000008; // object thrown from a pure module |
| 75 | +enum TI_IsWinRT = 0x00000010; // object thrown is a WinRT Exception |
| 76 | + |
| 77 | +extern(Windows) void RaiseException(DWORD dwExceptionCode, |
| 78 | + DWORD dwExceptionFlags, |
| 79 | + DWORD nNumberOfArguments, |
| 80 | + ULONG_PTR* lpArguments); |
| 81 | + |
| 82 | +__gshared TypeDescriptor!16 tdObject = { 0, null, "_D6object6Object\0" }; |
| 83 | +__gshared TypeDescriptor!20 tdThrowable = { 0, null, "_D6object9Throwable\0" }; |
| 84 | +__gshared TypeDescriptor!12 tdException = { 0, null, "_D9Exception\0" }; |
| 85 | +version(none) { |
| 86 | +__gshared CatchableType ctThrowable = { CT_IsSimpleType, cast(TypeDescriptor!1*) &tdThrowable, { 0, -1, 0 }, 4, null }; |
| 87 | +__gshared CatchableType ctException = { CT_IsSimpleType, cast(TypeDescriptor!1*) &tdException, { 0, -1, 0 }, 4, null }; |
| 88 | +__gshared CatchableTypeArray ctArray = { 2, [ &ctThrowable, &ctException ] }; |
| 89 | +__gshared _ThrowInfo objectThrowInfo = { 0, null, null, &ctArray }; |
| 90 | +} |
| 91 | + |
| 92 | +enum int STATUS_MSC_EXCEPTION = 0xe0000000 | ('m' << 16) | ('s' << 8) | ('c' << 0); |
| 93 | + |
| 94 | +enum EXCEPTION_NONCONTINUABLE = 0x01; |
| 95 | +enum EXCEPTION_UNWINDING = 0x02; |
| 96 | + |
| 97 | +enum EH_MAGIC_NUMBER1 = 0x19930520; |
| 98 | + |
| 99 | +extern(C) void _d_throw_exception(Object e) |
| 100 | +{ |
| 101 | + if (e is null) |
| 102 | + fatalerror("Cannot throw null exception"); |
| 103 | + auto ti = typeid(e); |
| 104 | + if (ti is null) |
| 105 | + fatalerror("Cannot throw corrupt exception object with null classinfo"); |
| 106 | + |
| 107 | + ULONG_PTR[3] ExceptionInformation; |
| 108 | + ExceptionInformation[0] = EH_MAGIC_NUMBER1; |
| 109 | + ExceptionInformation[1] = cast(ULONG_PTR) cast(void*) &e; |
| 110 | + ExceptionInformation[2] = cast(ULONG_PTR) getThrowInfo(ti); |
| 111 | + |
| 112 | + RaiseException(STATUS_MSC_EXCEPTION, EXCEPTION_NONCONTINUABLE, 3, ExceptionInformation.ptr); |
| 113 | +} |
| 114 | + |
| 115 | +import rt.util.container.hashtab; |
| 116 | +import core.sync.mutex; |
| 117 | + |
| 118 | +__gshared HashTab!(TypeInfo_Class, _ThrowInfo) throwInfoHashtab; |
| 119 | +__gshared HashTab!(TypeInfo_Class, CatchableType) catchableHashtab; |
| 120 | +__gshared Mutex throwInfoMutex; |
| 121 | + |
| 122 | +// create and cache throwinfo for ti |
| 123 | +_ThrowInfo* getThrowInfo(TypeInfo_Class ti) |
| 124 | +{ |
| 125 | + throwInfoMutex.lock(); |
| 126 | + if (auto p = ti in throwInfoHashtab) |
| 127 | + { |
| 128 | + throwInfoMutex.unlock(); |
| 129 | + return p; |
| 130 | + } |
| 131 | + |
| 132 | + size_t classes = 0; |
| 133 | + for (TypeInfo_Class tic = ti; tic; tic = tic.base) |
| 134 | + classes++; |
| 135 | + |
| 136 | + size_t sz = int.sizeof + classes * ImgPtr!(CatchableType*).sizeof; |
| 137 | + auto cta = cast(CatchableTypeArray*) malloc(sz); |
| 138 | + if (!cta) |
| 139 | + onOutOfMemoryError(); |
| 140 | + cta.nCatchableTypes = classes; |
| 141 | + |
| 142 | + size_t c = 0; |
| 143 | + for (TypeInfo_Class tic = ti; tic; tic = tic.base) |
| 144 | + cta.arrayOfCatchableTypes.ptr[c++] = getCatchableType(tic); |
| 145 | + |
| 146 | + _ThrowInfo tinf = { 0, null, null, cta }; |
| 147 | + throwInfoHashtab[ti] = tinf; |
| 148 | + auto pti = ti in throwInfoHashtab; |
| 149 | + throwInfoMutex.unlock(); |
| 150 | + return pti; |
| 151 | +} |
| 152 | + |
| 153 | +CatchableType* getCatchableType(TypeInfo_Class ti) |
| 154 | +{ |
| 155 | + if (auto p = ti in catchableHashtab) |
| 156 | + return p; |
| 157 | + |
| 158 | + static size_t mangledNameLength(string s) |
| 159 | + { |
| 160 | + size_t len = 2 + s.length; // "_D" + identifier + 1 digit per dot |
| 161 | + for (size_t q = 0; q < s.length; ) |
| 162 | + { |
| 163 | + size_t p = q; |
| 164 | + while (p < s.length && s.ptr[p] != '.') |
| 165 | + p++; |
| 166 | + for (size_t r = p - q; r >= 10; r /= 10) // add digits for length >= 10 |
| 167 | + len++; |
| 168 | + q = p + 1; |
| 169 | + } |
| 170 | + return len; |
| 171 | + } |
| 172 | + |
| 173 | + static void mangleName(string s, char* buf) |
| 174 | + { |
| 175 | + *buf++ = '_'; |
| 176 | + *buf++ = 'D'; |
| 177 | + for (size_t q = 0; q < s.length; ) |
| 178 | + { |
| 179 | + size_t p = q; |
| 180 | + while (p < s.length && s.ptr[p] != '.') |
| 181 | + p++; |
| 182 | + size_t digits = 10; |
| 183 | + size_t len = p - q; |
| 184 | + for ( ; len >= digits; digits *= 10) {} |
| 185 | + for (digits /= 10; digits > 1; digits /= 10) |
| 186 | + { |
| 187 | + size_t dig = len / digits; |
| 188 | + *buf++ = cast(char)('0' + dig); |
| 189 | + len -= dig * digits; |
| 190 | + } |
| 191 | + *buf++ = cast(char)('0' + len); |
| 192 | + memcpy(buf, s.ptr + q, p - q); |
| 193 | + buf += p - q; |
| 194 | + q = p + 1; |
| 195 | + } |
| 196 | + *buf = 0; |
| 197 | + } |
| 198 | + |
| 199 | + size_t mangledLength = mangledNameLength(ti.name) + 1; |
| 200 | + size_t sz = TypeDescriptor!1.sizeof + mangledLength; |
| 201 | + auto td = cast(TypeDescriptor!1*) malloc(sz); |
| 202 | + if (!td) |
| 203 | + onOutOfMemoryError(); |
| 204 | + |
| 205 | + td.hash = 0; |
| 206 | + td.spare = null; |
| 207 | + mangleName(ti.name, td.name.ptr); |
| 208 | + |
| 209 | + CatchableType ct = { CT_IsSimpleType, td, { 0, -1, 0 }, 4, null }; |
| 210 | + catchableHashtab[ti] = ct; |
| 211 | + return ti in catchableHashtab; |
| 212 | +} |
| 213 | + |
| 214 | +void msvc_eh_init() |
| 215 | +{ |
| 216 | + throwInfoMutex = new Mutex; |
| 217 | + |
| 218 | + // Exception has a special mangling that's not reflected in the name |
| 219 | + |
| 220 | + CatchableType ctObject = { CT_IsSimpleType, cast(TypeDescriptor!1*) &tdObject, { 0, -1, 0 }, 4, null }; |
| 221 | + catchableHashtab[typeid(Object)] = ctObject; |
| 222 | + CatchableType ctThrowable = { CT_IsSimpleType, cast(TypeDescriptor!1*) &tdThrowable, { 0, -1, 0 }, 4, null }; |
| 223 | + catchableHashtab[typeid(Throwable)] = ctThrowable; |
| 224 | + CatchableType ctException = { CT_IsSimpleType, cast(TypeDescriptor!1*) &tdException, { 0, -1, 0 }, 4, null }; |
| 225 | + catchableHashtab[typeid(Exception)] = ctException; |
| 226 | +} |
| 227 | + |
| 228 | +shared static this() |
| 229 | +{ |
| 230 | + // should be called from rt_init |
| 231 | + msvc_eh_init(); |
| 232 | +} |
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