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//===--- ImageInspectionWin32.cpp - Win32 image inspection ----------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "SymbolInfo.h"
#if defined(_WIN32) && !defined(__CYGWIN__)
#define WIN32_LEAN_AND_MEAN
#define NOMINMAX
#include <Windows.h>
#include <DbgHelp.h>
#include <psapi.h>
#elif SWIFT_STDLIB_HAS_DLADDR
#include <dlfcn.h>
#endif
#include "swift/Runtime/Win32.h"
#include "ImageInspection.h"
using namespace swift;
const char *SymbolInfo::getFilename() const {
#if defined(_WIN32) && !defined(__CYGWIN__)
return _moduleFileName;
#elif SWIFT_STDLIB_HAS_DLADDR
return _info.dli_fname;
#else
return nullptr;
#endif
}
const void *SymbolInfo::getBaseAddress() const {
#if defined(_WIN32) && !defined(__CYGWIN__)
return _moduleBaseAddress;
#elif SWIFT_STDLIB_HAS_DLADDR
return _info.dli_fbase;
#else
return nullptr;
#endif
}
const char *SymbolInfo::getSymbolName() const {
#if defined(_WIN32) && !defined(__CYGWIN__)
return _symbolName;
#elif SWIFT_STDLIB_HAS_DLADDR
return _info.dli_sname;
#else
return nullptr;
#endif
}
const void *SymbolInfo::getSymbolAddress() const {
#if defined(_WIN32) && !defined(__CYGWIN__)
return _symbolAddress;
#elif SWIFT_STDLIB_HAS_DLADDR
return _info.dli_saddr;
#else
return nullptr;
#endif
}
#if defined(_WIN32) && !defined(__CYGWIN__)
struct Win32ModuleInfo {
const char *name;
const void *base;
};
// Get the filename and base of the module that contains the specified
// address. N.B. This returns a `malloc`-ed copy of the filename in the
// Win32ModuleInfo struct; you are responsible for freeing that.
static Win32ModuleInfo moduleInfoFromAddress(const void *address) {
HMODULE hModule;
if (GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
| GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
(LPCTSTR)address,
&hModule)) {
MODULEINFO mi;
if (!GetModuleInformation(GetCurrentProcess(), hModule,
&mi, sizeof(mi))) {
ZeroMemory(&mi, sizeof(mi));
}
WCHAR wszBuffer[256];
LPWSTR pwszFileName = wszBuffer;
DWORD dwCapacity = sizeof(wszBuffer) / sizeof(*wszBuffer);
DWORD dwRet = GetModuleFileNameW(hModule, pwszFileName, dwCapacity);
if (dwRet == dwCapacity) {
dwCapacity = 512;
pwszFileName = (LPWSTR)::malloc(sizeof(WCHAR) * dwCapacity);
while (true) {
dwRet = GetModuleFileNameW(hModule, pwszFileName, dwCapacity);
if (dwRet != dwCapacity)
break;
dwCapacity *= 2;
pwszFileName = (LPWSTR)::realloc(pwszFileName,
sizeof(WCHAR) * dwCapacity);
}
}
if (dwRet == 0) {
if (pwszFileName != wszBuffer)
::free(pwszFileName);
return { ::strdup("<unknown>"), mi.lpBaseOfDll };
}
const char *result = _swift_win32_copyUTF8FromWide(pwszFileName);
if (pwszFileName != wszBuffer)
::free((void *)pwszFileName);
return { result, mi.lpBaseOfDll };
} else {
return { ::strdup("<unknown>"), nullptr };
}
}
#endif
std::optional<SymbolInfo> SymbolInfo::lookup(const void *address) {
#if defined(__wasm__)
// Currently, Wasm doesn't have a standard stable ABI for exporting address <->
// symbol table, it's work in progress. Also, there is no API to access such
// information from Wasm binary side. It's accessible only from host VM.
// See https://github.com/WebAssembly/tool-conventions/blob/main/DynamicLinking.md
#elif defined(_WIN32) && !defined(__CYGWIN__)
Win32ModuleInfo moduleInfo = moduleInfoFromAddress(address);
SYMBOL_INFO_PACKAGE package;
BOOL bRet;
package.si.SizeOfStruct = sizeof(SYMBOL_INFO);
package.si.MaxNameLen = MAX_SYM_NAME;
_swift_win32_withDbgHelpLibrary([&] (HANDLE hProcess) {
if (!hProcess) {
bRet = false;
return;
}
bRet = SymFromAddr(hProcess, reinterpret_cast<const DWORD64>(address),
nullptr, &package.si);
});
if (bRet) {
return SymbolInfo((const void *)package.si.Address,
::strdup(package.si.Name),
moduleInfo.name,
moduleInfo.base);
} else {
return SymbolInfo(address,
nullptr,
moduleInfo.name,
moduleInfo.base);
}
#elif SWIFT_STDLIB_HAS_DLADDR
SymbolInfo info;
if (dladdr(address, &info._info)) {
return info;
}
#endif
return {};
}
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