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| 1 | +//===----------------------------------------------------------------------===// |
| 2 | +// |
| 3 | +// This source file is part of the Swift.org open source project |
| 4 | +// |
| 5 | +// Copyright (c) 2014 - 2020 Apple Inc. and the Swift project authors |
| 6 | +// Licensed under Apache License v2.0 with Runtime Library Exception |
| 7 | +// |
| 8 | +// See https://swift.org/LICENSE.txt for license information |
| 9 | +// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors |
| 10 | +// |
| 11 | +//===----------------------------------------------------------------------===// |
| 12 | + |
| 13 | +#if defined(_WIN32) |
| 14 | + |
| 15 | +#pragma comment(lib, "swiftCore.lib") |
| 16 | + |
| 17 | +#include "../SwiftInspectClientInterface/SwiftInspectClientInterface.h" |
| 18 | +#include <memory> |
| 19 | +#include <stdio.h> |
| 20 | +#include <strsafe.h> |
| 21 | +#include <vector> |
| 22 | +#include <windows.h> |
| 23 | + |
| 24 | +namespace { |
| 25 | + |
| 26 | +struct ScopedHandle { |
| 27 | + HANDLE Handle; |
| 28 | + explicit ScopedHandle(HANDLE Handle) noexcept : Handle(Handle) {} |
| 29 | + ~ScopedHandle() noexcept { |
| 30 | + if (Handle != NULL) { |
| 31 | + CloseHandle(Handle); |
| 32 | + } |
| 33 | + } |
| 34 | + HANDLE get() const { return Handle; } |
| 35 | +}; |
| 36 | + |
| 37 | +struct ScopedViewOfFile { |
| 38 | + void *View; |
| 39 | + explicit ScopedViewOfFile(void *View) noexcept : View(View) {} |
| 40 | + ~ScopedViewOfFile() noexcept { |
| 41 | + if (View != NULL) { |
| 42 | + UnmapViewOfFile(View); |
| 43 | + } |
| 44 | + } |
| 45 | + void *get() const { return View; } |
| 46 | + template <typename T> T *as() const { return reinterpret_cast<T *>(View); } |
| 47 | +}; |
| 48 | + |
| 49 | +struct ScopedHeapLock { |
| 50 | + HANDLE Heap; |
| 51 | + bool Failure = false; |
| 52 | + explicit ScopedHeapLock(HANDLE Heap) noexcept : Heap(Heap) { |
| 53 | + if (!HeapLock(Heap)) { |
| 54 | + OutputDebugStringA("Failed to lock heap\n"); |
| 55 | + Failure = true; |
| 56 | + } |
| 57 | + } |
| 58 | + ~ScopedHeapLock() noexcept { |
| 59 | + if (Heap != NULL && !Failure) { |
| 60 | + if (!HeapUnlock(Heap)) { |
| 61 | + OutputDebugStringA("Failed to lock heap\n"); |
| 62 | + } |
| 63 | + } |
| 64 | + } |
| 65 | +}; |
| 66 | + |
| 67 | +} // anonymous namespace |
| 68 | + |
| 69 | +#define BUF_NUM_ENTRIES (BUF_SIZE / sizeof(HeapEntry)) |
| 70 | + |
| 71 | +static int heapWalk() { |
| 72 | + // Format the shared mem and event object names |
| 73 | + DWORD Pid = GetCurrentProcessId(); |
| 74 | + char SharedMemName[128]; |
| 75 | + char ReadEventName[128]; |
| 76 | + char WriteEventName[128]; |
| 77 | + if (StringCbPrintfA(SharedMemName, sizeof(SharedMemName), "%hS-%lu", |
| 78 | + SHARED_MEM_NAME_PREFIX, Pid) != S_OK) { |
| 79 | + OutputDebugStringA("StringCbPrintfA for SharedMemName failed\n"); |
| 80 | + return 1; |
| 81 | + } |
| 82 | + if (StringCbPrintfA(ReadEventName, sizeof(ReadEventName), "%hS-%lu", |
| 83 | + READ_EVENT_NAME_PREFIX, Pid) != S_OK) { |
| 84 | + OutputDebugStringA("StringCbPrintfA for ReadEventName failed\n"); |
| 85 | + return 1; |
| 86 | + } |
| 87 | + if (StringCbPrintfA(WriteEventName, sizeof(WriteEventName), "%hS-%lu", |
| 88 | + WRITE_EVENT_NAME_PREFIX, Pid) != S_OK) { |
| 89 | + OutputDebugStringA("StringCbPrintfA for WriteEventName failed\n"); |
| 90 | + return 1; |
| 91 | + } |
| 92 | + |
| 93 | + ScopedHandle MapFile( |
| 94 | + OpenFileMappingA(FILE_MAP_ALL_ACCESS, false, SharedMemName)); |
| 95 | + if (MapFile.get() == NULL) { |
| 96 | + OutputDebugStringA("OpenFileMapping failed\n"); |
| 97 | + return 1; |
| 98 | + } |
| 99 | + ScopedViewOfFile Buf( |
| 100 | + MapViewOfFile(MapFile.Handle, FILE_MAP_ALL_ACCESS, 0, 0, BUF_SIZE)); |
| 101 | + if (Buf.get() == NULL) { |
| 102 | + OutputDebugStringA("MapViewOfFile failed\n"); |
| 103 | + return 1; |
| 104 | + } |
| 105 | + std::memset(Buf.get(), 0, BUF_SIZE); |
| 106 | + ScopedHandle WriteEvent(OpenEventA(EVENT_ALL_ACCESS, false, WriteEventName)); |
| 107 | + if (WriteEvent.get() == NULL) { |
| 108 | + OutputDebugStringA("OpenEventA failed\n"); |
| 109 | + return 1; |
| 110 | + } |
| 111 | + ScopedHandle ReadEvent(OpenEventA(EVENT_ALL_ACCESS, false, ReadEventName)); |
| 112 | + if (ReadEvent.get() == NULL) { |
| 113 | + OutputDebugStringA("OpenEventA failed\n"); |
| 114 | + return 1; |
| 115 | + } |
| 116 | + |
| 117 | + // Collect heaps. This is a loop because GetProcessHeaps requires |
| 118 | + // specifying the max number of heaps to get upfront. |
| 119 | + std::vector<HANDLE> Heaps; |
| 120 | + while (TRUE) { |
| 121 | + DWORD ActualHeapCount = GetProcessHeaps(Heaps.size(), Heaps.data()); |
| 122 | + if (ActualHeapCount <= Heaps.size()) { |
| 123 | + Heaps.resize(ActualHeapCount); |
| 124 | + break; |
| 125 | + } |
| 126 | + Heaps.resize(ActualHeapCount); |
| 127 | + } |
| 128 | + |
| 129 | + // Iterate heaps and heap entries |
| 130 | + size_t Count = 0; |
| 131 | + for (HANDLE Heap : Heaps) { |
| 132 | + PROCESS_HEAP_ENTRY Entry; |
| 133 | + |
| 134 | + ScopedHeapLock HeapLock(Heap); |
| 135 | + if (HeapLock.Failure) { |
| 136 | + continue; |
| 137 | + } |
| 138 | + |
| 139 | + Entry.lpData = NULL; |
| 140 | + while (HeapWalk(Heap, &Entry)) { |
| 141 | + if ((!(Entry.wFlags & PROCESS_HEAP_REGION)) && |
| 142 | + (!(Entry.wFlags & PROCESS_HEAP_UNCOMMITTED_RANGE)) && |
| 143 | + (Entry.wFlags & PROCESS_HEAP_ENTRY_BUSY)) { |
| 144 | + if (Count < BUF_NUM_ENTRIES) { |
| 145 | + Buf.as<HeapEntry>()[Count].Address = |
| 146 | + reinterpret_cast<uintptr_t>(Entry.lpData); |
| 147 | + Buf.as<HeapEntry>()[Count].Size = Entry.cbData + Entry.cbOverhead; |
| 148 | + ++Count; |
| 149 | + } else { |
| 150 | + if (!SetEvent(ReadEvent.get())) { |
| 151 | + OutputDebugStringA("SetEvent on ReadEvent failed\n"); |
| 152 | + return 1; |
| 153 | + } |
| 154 | + DWORD Wait = WaitForSingleObject(WriteEvent.get(), WAIT_TIMEOUT_MS); |
| 155 | + if (Wait != WAIT_OBJECT_0) { |
| 156 | + char Msg[128]; |
| 157 | + if (StringCbPrintfA(Msg, sizeof(Msg), |
| 158 | + "WaitForSingleObject failed %lu\n", |
| 159 | + Wait) == S_OK) { |
| 160 | + OutputDebugStringA(Msg); |
| 161 | + } |
| 162 | + return 1; |
| 163 | + } |
| 164 | + std::memset(Buf.get(), 0, BUF_SIZE); |
| 165 | + Count = 0; |
| 166 | + } |
| 167 | + } |
| 168 | + } |
| 169 | + |
| 170 | + // Write the remaining entries. |
| 171 | + if (!SetEvent(ReadEvent.get())) { |
| 172 | + OutputDebugStringA("SetEvent on ReadEvent failed\n"); |
| 173 | + return 1; |
| 174 | + } |
| 175 | + if (Count > 0) { |
| 176 | + DWORD Wait = WaitForSingleObject(WriteEvent.get(), WAIT_TIMEOUT_MS); |
| 177 | + if (Wait != WAIT_OBJECT_0) { |
| 178 | + char Msg[128]; |
| 179 | + if (StringCbPrintfA(Msg, sizeof(Msg), |
| 180 | + "WaitForSingleObject failed %lu\n", Wait) == S_OK) { |
| 181 | + OutputDebugStringA(Msg); |
| 182 | + } |
| 183 | + return 1; |
| 184 | + } |
| 185 | + std::memset(Buf.get(), 0, BUF_SIZE); |
| 186 | + Count = 0; |
| 187 | + } |
| 188 | + } |
| 189 | + |
| 190 | + // Indicate the end of iteration with one last write. |
| 191 | + std::memset(Buf.get(), 0, BUF_SIZE); |
| 192 | + Buf.as<HeapEntry>()[0].Address = -1; |
| 193 | + if (!SetEvent(ReadEvent.get())) { |
| 194 | + OutputDebugStringA("SetEvent at the end of heap iteration failed\n"); |
| 195 | + return 1; |
| 196 | + } |
| 197 | + DWORD Wait = WaitForSingleObject(WriteEvent.get(), WAIT_TIMEOUT_MS); |
| 198 | + if (Wait != WAIT_OBJECT_0) { |
| 199 | + char Msg[128]; |
| 200 | + if (StringCbPrintfA(Msg, sizeof(Msg), "WaitForSingleObject failed %lu\n", |
| 201 | + Wait) == S_OK) { |
| 202 | + OutputDebugStringA(Msg); |
| 203 | + } |
| 204 | + return 1; |
| 205 | + } |
| 206 | + |
| 207 | + return 0; |
| 208 | +} |
| 209 | + |
| 210 | +BOOL APIENTRY DllMain(HANDLE hModule, DWORD ul_reason_for_call, |
| 211 | + LPVOID lpReserved) { |
| 212 | + if (ul_reason_for_call == DLL_PROCESS_ATTACH) { |
| 213 | + heapWalk(); |
| 214 | + } |
| 215 | + return TRUE; |
| 216 | +} |
| 217 | + |
| 218 | +#endif |
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