gecko/tools/profiler/shared-libraries-win32.cc

125 lines
4.3 KiB
C++

/* -*- 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 <tlhelp32.h>
#include <dbghelp.h>
#include "shared-libraries.h"
#include "nsWindowsHelpers.h"
#define CV_SIGNATURE 0x53445352 // 'SDSR'
struct CodeViewRecord70
{
uint32_t signature;
GUID pdbSignature;
uint32_t pdbAge;
char pdbFileName[1];
};
static bool GetPdbInfo(uintptr_t aStart, nsID& aSignature, uint32_t& aAge, char** aPdbName)
{
if (!aStart) {
return false;
}
PIMAGE_DOS_HEADER dosHeader = reinterpret_cast<PIMAGE_DOS_HEADER>(aStart);
if (dosHeader->e_magic != IMAGE_DOS_SIGNATURE) {
return false;
}
PIMAGE_NT_HEADERS ntHeaders = reinterpret_cast<PIMAGE_NT_HEADERS>(
aStart + dosHeader->e_lfanew);
if (ntHeaders->Signature != IMAGE_NT_SIGNATURE) {
return false;
}
uint32_t relativeVirtualAddress =
ntHeaders->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_DEBUG].VirtualAddress;
if (!relativeVirtualAddress) {
return false;
}
PIMAGE_DEBUG_DIRECTORY debugDirectory =
reinterpret_cast<PIMAGE_DEBUG_DIRECTORY>(aStart + relativeVirtualAddress);
if (!debugDirectory || debugDirectory->Type != IMAGE_DEBUG_TYPE_CODEVIEW) {
return false;
}
CodeViewRecord70 *debugInfo = reinterpret_cast<CodeViewRecord70 *>(
aStart + debugDirectory->AddressOfRawData);
if (!debugInfo || debugInfo->signature != CV_SIGNATURE) {
return false;
}
aAge = debugInfo->pdbAge;
GUID& pdbSignature = debugInfo->pdbSignature;
aSignature.m0 = pdbSignature.Data1;
aSignature.m1 = pdbSignature.Data2;
aSignature.m2 = pdbSignature.Data3;
memcpy(aSignature.m3, pdbSignature.Data4, sizeof(pdbSignature.Data4));
// 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
char * leafName = strrchr(debugInfo->pdbFileName, '\\');
if (leafName) {
// Only report the file portion of the path
*aPdbName = leafName + 1;
} else {
*aPdbName = debugInfo->pdbFileName;
}
return true;
}
SharedLibraryInfo SharedLibraryInfo::GetInfoForSelf()
{
SharedLibraryInfo sharedLibraryInfo;
nsAutoHandle snap(CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, GetCurrentProcessId()));
MODULEENTRY32 module = {0};
module.dwSize = sizeof(MODULEENTRY32);
if (Module32First(snap, &module)) {
do {
nsID pdbSig;
uint32_t pdbAge;
char *pdbName = NULL;
// Load the module again to make sure that its handle will remain remain
// valid as we attempt to read the PDB information from it. We load the
// DLL as a datafile so that if the module actually gets unloaded between
// the call to Module32Next and the following LoadLibraryEx, we don't end
// up running the now newly loaded module's DllMain function. If the
// module is already loaded, LoadLibraryEx just increments its refcount.
//
// Note that because of the race condition above, merely loading the DLL
// again is not safe enough, therefore we also need to make sure that we
// can read the memory mapped at the base address before we can safely
// proceed to actually access those pages.
HMODULE handleLock = LoadLibraryEx(module.szExePath, NULL, LOAD_LIBRARY_AS_DATAFILE);
MEMORY_BASIC_INFORMATION vmemInfo = {0};
if (handleLock &&
sizeof(vmemInfo) == VirtualQuery(module.modBaseAddr, &vmemInfo, sizeof(vmemInfo)) &&
vmemInfo.State == MEM_COMMIT &&
GetPdbInfo((uintptr_t)module.modBaseAddr, pdbSig, pdbAge, &pdbName)) {
SharedLibrary shlib((uintptr_t)module.modBaseAddr,
(uintptr_t)module.modBaseAddr+module.modBaseSize,
0, // DLLs are always mapped at offset 0 on Windows
pdbSig,
pdbAge,
pdbName,
module.szModule);
sharedLibraryInfo.AddSharedLibrary(shlib);
}
FreeLibrary(handleLock); // ok to free null handles
} while (Module32Next(snap, &module));
}
return sharedLibraryInfo;
}