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-rw-r--r--mozglue/baseprofiler/core/shared-libraries-win32.cc198
1 files changed, 198 insertions, 0 deletions
diff --git a/mozglue/baseprofiler/core/shared-libraries-win32.cc b/mozglue/baseprofiler/core/shared-libraries-win32.cc
new file mode 100644
index 0000000000..2a453612d3
--- /dev/null
+++ b/mozglue/baseprofiler/core/shared-libraries-win32.cc
@@ -0,0 +1,198 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <windows.h>
+
+#include "BaseProfilerSharedLibraries.h"
+
+#include "mozilla/glue/WindowsUnicode.h"
+#include "mozilla/NativeNt.h"
+#include "mozilla/WindowsEnumProcessModules.h"
+
+#include <cctype>
+#include <string>
+
+static constexpr char uppercaseDigits[16] = {'0', '1', '2', '3', '4', '5',
+ '6', '7', '8', '9', 'A', 'B',
+ 'C', 'D', 'E', 'F'};
+static constexpr char lowercaseDigits[16] = {'0', '1', '2', '3', '4', '5',
+ '6', '7', '8', '9', 'a', 'b',
+ 'c', 'd', 'e', 'f'};
+
+static void AppendHex(const unsigned char* aBegin, const unsigned char* aEnd,
+ std::string& aOut) {
+ for (const unsigned char* p = aBegin; p < aEnd; ++p) {
+ unsigned char c = *p;
+ aOut += uppercaseDigits[c >> 4];
+ aOut += uppercaseDigits[c & 0xFu];
+ }
+}
+
+static constexpr bool WITH_PADDING = true;
+static constexpr bool WITHOUT_PADDING = false;
+static constexpr bool LOWERCASE = true;
+static constexpr bool UPPERCASE = false;
+template <typename T>
+static void AppendHex(T aValue, std::string& aOut, bool aWithPadding,
+ bool aLowercase = UPPERCASE) {
+ for (int i = sizeof(T) * 2 - 1; i >= 0; --i) {
+ unsigned nibble = (aValue >> (i * 4)) & 0xFu;
+ // If no-padding requested, skip starting zeroes -- unless we're on the very
+ // last nibble (so we don't output a blank).
+ if (!aWithPadding && i != 0) {
+ if (nibble == 0) {
+ // Requested no padding, skip zeroes.
+ continue;
+ }
+ // Requested no padding, got first non-zero, pretend we now want padding
+ // so we don't skip zeroes anymore.
+ aWithPadding = true;
+ }
+ aOut += aLowercase ? lowercaseDigits[nibble] : uppercaseDigits[nibble];
+ }
+}
+
+static bool IsModuleUnsafeToLoad(const std::string& aModuleName) {
+ auto LowerCaseEqualsLiteral = [](char aModuleChar, char aDetouredChar) {
+ return std::tolower(aModuleChar) == aDetouredChar;
+ };
+
+ // Hackaround for Bug 1723868. There is no safe way to prevent the module
+ // Microsoft's VP9 Video Decoder from being unloaded because mfplat.dll may
+ // have posted more than one task to unload the module in the work queue
+ // without calling LoadLibrary.
+ constexpr std::string_view vp9_decoder_dll = "msvp9dec_store.dll";
+ if (std::equal(aModuleName.cbegin(), aModuleName.cend(),
+ vp9_decoder_dll.cbegin(), vp9_decoder_dll.cend(),
+ LowerCaseEqualsLiteral)) {
+ return true;
+ }
+
+ return false;
+}
+
+void SharedLibraryInfo::AddSharedLibraryFromModuleInfo(
+ const wchar_t* aModulePath, mozilla::Maybe<HMODULE> aModule) {
+ mozilla::UniquePtr<char[]> utf8ModulePath(
+ mozilla::glue::WideToUTF8(aModulePath));
+ if (!utf8ModulePath) {
+ return;
+ }
+
+ std::string modulePathStr(utf8ModulePath.get());
+ size_t pos = modulePathStr.find_last_of("\\/");
+ std::string moduleNameStr = (pos != std::string::npos)
+ ? modulePathStr.substr(pos + 1)
+ : modulePathStr;
+
+ // If the module is unsafe to call LoadLibraryEx for, we skip.
+ if (IsModuleUnsafeToLoad(moduleNameStr)) {
+ return;
+ }
+
+ // Load the module again - to make sure that its handle will remain valid as
+ // we attempt to read the PDB information from it - or for the first time if
+ // we only have a path. We want to load the DLL without running the newly
+ // loaded module's DllMain function, but not as a data file because we want
+ // to be able to do RVA computations easily. Hence, we use the flag
+ // LOAD_LIBRARY_AS_IMAGE_RESOURCE which ensures that the sections (not PE
+ // headers) will be relocated by the loader. Otherwise GetPdbInfo() and/or
+ // GetVersionInfo() can cause a crash. If the original handle |aModule| is
+ // valid, LoadLibraryEx just increments its refcount.
+ nsModuleHandle handleLock(
+ ::LoadLibraryExW(aModulePath, NULL, LOAD_LIBRARY_AS_IMAGE_RESOURCE));
+ if (!handleLock) {
+ return;
+ }
+
+ mozilla::nt::PEHeaders headers(handleLock.get());
+ if (!headers) {
+ return;
+ }
+
+ mozilla::Maybe<mozilla::Range<const uint8_t>> bounds = headers.GetBounds();
+ if (!bounds) {
+ return;
+ }
+
+ // Put the original |aModule| into SharedLibrary, but we get debug info
+ // from |handleLock| as |aModule| might be inaccessible.
+ const uintptr_t modStart =
+ aModule.isSome() ? reinterpret_cast<uintptr_t>(*aModule)
+ : reinterpret_cast<uintptr_t>(handleLock.get());
+ const uintptr_t modEnd = modStart + bounds->length();
+
+ std::string breakpadId;
+ std::string pdbPathStr;
+ std::string pdbNameStr;
+ if (const auto* debugInfo = headers.GetPdbInfo()) {
+ MOZ_ASSERT(breakpadId.empty());
+ const GUID& pdbSig = debugInfo->pdbSignature;
+ AppendHex(pdbSig.Data1, breakpadId, WITH_PADDING);
+ AppendHex(pdbSig.Data2, breakpadId, WITH_PADDING);
+ AppendHex(pdbSig.Data3, breakpadId, WITH_PADDING);
+ AppendHex(reinterpret_cast<const unsigned char*>(&pdbSig.Data4),
+ reinterpret_cast<const unsigned char*>(&pdbSig.Data4) +
+ sizeof(pdbSig.Data4),
+ breakpadId);
+ AppendHex(debugInfo->pdbAge, breakpadId, WITHOUT_PADDING);
+
+ // The PDB file name could be different from module filename,
+ // so report both
+ // e.g. The PDB for C:\Windows\SysWOW64\ntdll.dll is wntdll.pdb
+ pdbPathStr = debugInfo->pdbFileName;
+ size_t pos = pdbPathStr.find_last_of("\\/");
+ pdbNameStr =
+ (pos != std::string::npos) ? pdbPathStr.substr(pos + 1) : pdbPathStr;
+ }
+
+ std::string codeId;
+ DWORD timestamp;
+ DWORD imageSize;
+ if (headers.GetTimeStamp(timestamp) && headers.GetImageSize(imageSize)) {
+ AppendHex(timestamp, codeId, WITH_PADDING);
+ AppendHex(imageSize, codeId, WITHOUT_PADDING, LOWERCASE);
+ }
+
+ std::string versionStr;
+ uint64_t version;
+ if (headers.GetVersionInfo(version)) {
+ versionStr += std::to_string((version >> 48) & 0xFFFF);
+ versionStr += '.';
+ versionStr += std::to_string((version >> 32) & 0xFFFF);
+ versionStr += '.';
+ versionStr += std::to_string((version >> 16) & 0xFFFF);
+ versionStr += '.';
+ versionStr += std::to_string(version & 0xFFFF);
+ }
+
+ SharedLibrary shlib(modStart, modEnd,
+ 0, // DLLs are always mapped at offset 0 on Windows
+ breakpadId, codeId, moduleNameStr, modulePathStr,
+ pdbNameStr, pdbPathStr, versionStr, "");
+ AddSharedLibrary(shlib);
+}
+
+SharedLibraryInfo SharedLibraryInfo::GetInfoForSelf() {
+ SharedLibraryInfo sharedLibraryInfo;
+
+ auto addSharedLibraryFromModuleInfo =
+ [&sharedLibraryInfo](const wchar_t* aModulePath, HMODULE aModule) {
+ sharedLibraryInfo.AddSharedLibraryFromModuleInfo(
+ aModulePath, mozilla::Some(aModule));
+ };
+
+ mozilla::EnumerateProcessModules(addSharedLibraryFromModuleInfo);
+ return sharedLibraryInfo;
+}
+
+SharedLibraryInfo SharedLibraryInfo::GetInfoFromPath(const wchar_t* aPath) {
+ SharedLibraryInfo sharedLibraryInfo;
+ sharedLibraryInfo.AddSharedLibraryFromModuleInfo(aPath, mozilla::Nothing());
+ return sharedLibraryInfo;
+}
+
+void SharedLibraryInfo::Initialize() { /* do nothing */
+}