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llvm-project/clang/lib/Driver/MSVCToolChain.cpp

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//===--- ToolChains.cpp - ToolChain Implementations -----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "ToolChains.h"
#include "clang/Basic/CharInfo.h"
#include "clang/Basic/Version.h"
#include "clang/Driver/Compilation.h"
#include "clang/Driver/Driver.h"
#include "clang/Driver/DriverDiagnostic.h"
#include "clang/Driver/Options.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/Option/Arg.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Process.h"
// Include the necessary headers to interface with the Windows registry and
// environment.
#if defined(LLVM_ON_WIN32)
#define USE_WIN32
#endif
#ifdef USE_WIN32
#define WIN32_LEAN_AND_MEAN
#define NOGDI
#define NOMINMAX
#include <windows.h>
#endif
using namespace clang::driver;
using namespace clang::driver::toolchains;
using namespace clang;
using namespace llvm::opt;
MSVCToolChain::MSVCToolChain(const Driver &D, const llvm::Triple& Triple,
const ArgList &Args)
: ToolChain(D, Triple, Args) {
}
Tool *MSVCToolChain::buildLinker() const {
return new tools::visualstudio::Link(*this);
}
Tool *MSVCToolChain::buildAssembler() const {
if (getTriple().isOSBinFormatMachO())
return new tools::darwin::Assemble(*this);
getDriver().Diag(clang::diag::err_no_external_assembler);
return nullptr;
}
bool MSVCToolChain::IsIntegratedAssemblerDefault() const {
return true;
}
bool MSVCToolChain::IsUnwindTablesDefault() const {
// Emit unwind tables by default on Win64. All non-x86_32 Windows platforms
// such as ARM and PPC actually require unwind tables, but LLVM doesn't know
// how to generate them yet.
return getArch() == llvm::Triple::x86_64;
}
bool MSVCToolChain::isPICDefault() const {
return getArch() == llvm::Triple::x86_64;
}
bool MSVCToolChain::isPIEDefault() const {
return false;
}
bool MSVCToolChain::isPICDefaultForced() const {
return getArch() == llvm::Triple::x86_64;
}
#ifdef USE_WIN32
static bool readFullStringValue(HKEY hkey, const char *valueName,
std::string &value) {
// FIXME: We should be using the W versions of the registry functions, but
// doing so requires UTF8 / UTF16 conversions similar to how we handle command
// line arguments. The UTF8 conversion functions are not exposed publicly
// from LLVM though, so in order to do this we will probably need to create
// a registry abstraction in LLVMSupport that is Windows only.
DWORD result = 0;
DWORD valueSize = 0;
DWORD type = 0;
// First just query for the required size.
result = RegQueryValueEx(hkey, valueName, NULL, &type, NULL, &valueSize);
if (result != ERROR_SUCCESS || type != REG_SZ)
return false;
std::vector<BYTE> buffer(valueSize);
result = RegQueryValueEx(hkey, valueName, NULL, NULL, &buffer[0], &valueSize);
if (result == ERROR_SUCCESS)
value.assign(reinterpret_cast<const char *>(buffer.data()));
return result;
}
#endif
/// \brief Read registry string.
/// This also supports a means to look for high-versioned keys by use
/// of a $VERSION placeholder in the key path.
/// $VERSION in the key path is a placeholder for the version number,
/// causing the highest value path to be searched for and used.
/// I.e. "SOFTWARE\\Microsoft\\VisualStudio\\$VERSION".
/// There can be additional characters in the component. Only the numeric
/// characters are compared. This function only searches HKLM.
static bool getSystemRegistryString(const char *keyPath, const char *valueName,
std::string &value, std::string *phValue) {
#ifndef USE_WIN32
return false;
#else
HKEY hRootKey = HKEY_LOCAL_MACHINE;
HKEY hKey = NULL;
DWORD valueSize = 0;
long lResult;
bool returnValue = false;
const char *placeHolder = strstr(keyPath, "$VERSION");
std::string bestName;
// If we have a $VERSION placeholder, do the highest-version search.
if (placeHolder) {
const char *keyEnd = placeHolder - 1;
const char *nextKey = placeHolder;
// Find end of previous key.
while ((keyEnd > keyPath) && (*keyEnd != '\\'))
keyEnd--;
// Find end of key containing $VERSION.
while (*nextKey && (*nextKey != '\\'))
nextKey++;
size_t partialKeyLength = keyEnd - keyPath;
char partialKey[256];
if (partialKeyLength > sizeof(partialKey))
partialKeyLength = sizeof(partialKey);
strncpy(partialKey, keyPath, partialKeyLength);
partialKey[partialKeyLength] = '\0';
HKEY hTopKey = NULL;
lResult = RegOpenKeyEx(hRootKey, partialKey, 0, KEY_READ | KEY_WOW64_32KEY,
&hTopKey);
if (lResult == ERROR_SUCCESS) {
char keyName[256];
double bestValue = 0.0;
DWORD index, size = sizeof(keyName) - 1;
for (index = 0; RegEnumKeyEx(hTopKey, index, keyName, &size, NULL,
NULL, NULL, NULL) == ERROR_SUCCESS; index++) {
const char *sp = keyName;
while (*sp && !isDigit(*sp))
sp++;
if (!*sp)
continue;
const char *ep = sp + 1;
while (*ep && (isDigit(*ep) || (*ep == '.')))
ep++;
char numBuf[32];
strncpy(numBuf, sp, sizeof(numBuf) - 1);
numBuf[sizeof(numBuf) - 1] = '\0';
double dvalue = strtod(numBuf, NULL);
if (dvalue > bestValue) {
// Test that InstallDir is indeed there before keeping this index.
// Open the chosen key path remainder.
bestName = keyName;
// Append rest of key.
bestName.append(nextKey);
lResult = RegOpenKeyEx(hTopKey, bestName.c_str(), 0,
KEY_READ | KEY_WOW64_32KEY, &hKey);
if (lResult == ERROR_SUCCESS) {
lResult = readFullStringValue(hKey, valueName, value);
if (lResult == ERROR_SUCCESS) {
bestValue = dvalue;
if (phValue)
*phValue = bestName;
returnValue = true;
}
RegCloseKey(hKey);
}
}
size = sizeof(keyName) - 1;
}
RegCloseKey(hTopKey);
}
} else {
lResult =
RegOpenKeyEx(hRootKey, keyPath, 0, KEY_READ | KEY_WOW64_32KEY, &hKey);
if (lResult == ERROR_SUCCESS) {
lResult = readFullStringValue(hKey, valueName, value);
if (lResult == ERROR_SUCCESS)
returnValue = true;
if (phValue)
phValue->clear();
RegCloseKey(hKey);
}
}
return returnValue;
#endif // USE_WIN32
}
/// \brief Get Windows SDK installation directory.
bool MSVCToolChain::getWindowsSDKDir(std::string &path, int &major,
int &minor) const {
std::string sdkVersion;
// Try the Windows registry.
bool hasSDKDir = getSystemRegistryString(
"SOFTWARE\\Microsoft\\Microsoft SDKs\\Windows\\$VERSION",
"InstallationFolder", path, &sdkVersion);
if (!sdkVersion.empty())
::sscanf(sdkVersion.c_str(), "v%d.%d", &major, &minor);
return hasSDKDir && !path.empty();
}
// Gets the library path required to link against the Windows SDK.
bool MSVCToolChain::getWindowsSDKLibraryPath(std::string &path) const {
std::string sdkPath;
int sdkMajor = 0;
int sdkMinor = 0;
path.clear();
if (!getWindowsSDKDir(sdkPath, sdkMajor, sdkMinor))
return false;
llvm::SmallString<128> libPath(sdkPath);
llvm::sys::path::append(libPath, "Lib");
if (sdkMajor <= 7) {
switch (getArch()) {
// In Windows SDK 7.x, x86 libraries are directly in the Lib folder.
case llvm::Triple::x86:
break;
case llvm::Triple::x86_64:
llvm::sys::path::append(libPath, "x64");
break;
case llvm::Triple::arm:
// It is not necessary to link against Windows SDK 7.x when targeting ARM.
return false;
default:
return false;
}
} else {
// Windows SDK 8.x installs libraries in a folder whose names depend on the
// version of the OS you're targeting. By default choose the newest, which
// usually corresponds to the version of the OS you've installed the SDK on.
const char *tests[] = {"winv6.3", "win8", "win7"};
bool found = false;
for (const char *test : tests) {
llvm::SmallString<128> testPath(libPath);
llvm::sys::path::append(testPath, test);
if (llvm::sys::fs::exists(testPath.c_str())) {
libPath = testPath;
found = true;
break;
}
}
if (!found)
return false;
llvm::sys::path::append(libPath, "um");
switch (getArch()) {
case llvm::Triple::x86:
llvm::sys::path::append(libPath, "x86");
break;
case llvm::Triple::x86_64:
llvm::sys::path::append(libPath, "x64");
break;
case llvm::Triple::arm:
llvm::sys::path::append(libPath, "arm");
break;
default:
return false;
}
}
path = libPath.str();
return true;
}
// Get the location to use for Visual Studio binaries. The location priority
// is: %VCINSTALLDIR% > %PATH% > newest copy of Visual Studio installed on
// system (as reported by the registry).
bool MSVCToolChain::getVisualStudioBinariesFolder(const char *clangProgramPath,
std::string &path) const {
path.clear();
SmallString<128> BinDir;
// First check the environment variables that vsvars32.bat sets.
llvm::Optional<std::string> VcInstallDir =
llvm::sys::Process::GetEnv("VCINSTALLDIR");
if (VcInstallDir.hasValue()) {
BinDir = VcInstallDir.getValue();
llvm::sys::path::append(BinDir, "bin");
} else {
// Next walk the PATH, trying to find a cl.exe in the path. If we find one,
// use that. However, make sure it's not clang's cl.exe.
llvm::Optional<std::string> OptPath = llvm::sys::Process::GetEnv("PATH");
if (OptPath.hasValue()) {
const char EnvPathSeparatorStr[] = {llvm::sys::EnvPathSeparator, '\0'};
SmallVector<StringRef, 8> PathSegments;
llvm::SplitString(OptPath.getValue(), PathSegments, EnvPathSeparatorStr);
for (StringRef PathSegment : PathSegments) {
if (PathSegment.empty())
continue;
SmallString<128> FilePath(PathSegment);
llvm::sys::path::append(FilePath, "cl.exe");
if (llvm::sys::fs::can_execute(FilePath.c_str()) &&
!llvm::sys::fs::equivalent(FilePath.c_str(), clangProgramPath)) {
// If we found it on the PATH, use it exactly as is with no
// modifications.
path = PathSegment;
return true;
}
}
}
std::string installDir;
// With no VCINSTALLDIR and nothing on the PATH, if we can't find it in the
// registry then we have no choice but to fail.
if (!getVisualStudioInstallDir(installDir))
return false;
// Regardless of what binary we're ultimately trying to find, we make sure
// that this is a Visual Studio directory by checking for cl.exe. We use
// cl.exe instead of other binaries like link.exe because programs such as
// GnuWin32 also have a utility called link.exe, so cl.exe is the least
// ambiguous.
BinDir = installDir;
llvm::sys::path::append(BinDir, "VC", "bin");
SmallString<128> ClPath(BinDir);
llvm::sys::path::append(ClPath, "cl.exe");
if (!llvm::sys::fs::can_execute(ClPath.c_str()))
return false;
}
if (BinDir.empty())
return false;
switch (getArch()) {
case llvm::Triple::x86:
break;
case llvm::Triple::x86_64:
llvm::sys::path::append(BinDir, "amd64");
break;
case llvm::Triple::arm:
llvm::sys::path::append(BinDir, "arm");
break;
default:
// Whatever this is, Visual Studio doesn't have a toolchain for it.
return false;
}
path = BinDir.str();
return true;
}
// Get Visual Studio installation directory.
bool MSVCToolChain::getVisualStudioInstallDir(std::string &path) const {
// First check the environment variables that vsvars32.bat sets.
const char *vcinstalldir = getenv("VCINSTALLDIR");
if (vcinstalldir) {
path = vcinstalldir;
path = path.substr(0, path.find("\\VC"));
return true;
}
std::string vsIDEInstallDir;
std::string vsExpressIDEInstallDir;
// Then try the windows registry.
bool hasVCDir =
getSystemRegistryString("SOFTWARE\\Microsoft\\VisualStudio\\$VERSION",
"InstallDir", vsIDEInstallDir, nullptr);
if (hasVCDir && !vsIDEInstallDir.empty()) {
path = vsIDEInstallDir.substr(0, vsIDEInstallDir.find("\\Common7\\IDE"));
return true;
}
bool hasVCExpressDir =
getSystemRegistryString("SOFTWARE\\Microsoft\\VCExpress\\$VERSION",
"InstallDir", vsExpressIDEInstallDir, nullptr);
if (hasVCExpressDir && !vsExpressIDEInstallDir.empty()) {
path = vsExpressIDEInstallDir.substr(
0, vsIDEInstallDir.find("\\Common7\\IDE"));
return true;
}
// Try the environment.
const char *vs120comntools = getenv("VS120COMNTOOLS");
const char *vs100comntools = getenv("VS100COMNTOOLS");
const char *vs90comntools = getenv("VS90COMNTOOLS");
const char *vs80comntools = getenv("VS80COMNTOOLS");
const char *vscomntools = nullptr;
// Find any version we can
if (vs120comntools)
vscomntools = vs120comntools;
else if (vs100comntools)
vscomntools = vs100comntools;
else if (vs90comntools)
vscomntools = vs90comntools;
else if (vs80comntools)
vscomntools = vs80comntools;
if (vscomntools && *vscomntools) {
const char *p = strstr(vscomntools, "\\Common7\\Tools");
path = p ? std::string(vscomntools, p) : vscomntools;
return true;
}
return false;
}
void MSVCToolChain::AddSystemIncludeWithSubfolder(const ArgList &DriverArgs,
ArgStringList &CC1Args,
const std::string &folder,
const char *subfolder) const {
llvm::SmallString<128> path(folder);
llvm::sys::path::append(path, subfolder);
addSystemInclude(DriverArgs, CC1Args, path.str());
}
void MSVCToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
ArgStringList &CC1Args) const {
if (DriverArgs.hasArg(options::OPT_nostdinc))
return;
if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
SmallString<128> P(getDriver().ResourceDir);
llvm::sys::path::append(P, "include");
addSystemInclude(DriverArgs, CC1Args, P.str());
}
if (DriverArgs.hasArg(options::OPT_nostdlibinc))
return;
// Honor %INCLUDE%. It should know essential search paths with vcvarsall.bat.
if (const char *cl_include_dir = getenv("INCLUDE")) {
SmallVector<StringRef, 8> Dirs;
StringRef(cl_include_dir)
.split(Dirs, ";", /*MaxSplit=*/-1, /*KeepEmpty=*/false);
for (StringRef Dir : Dirs)
addSystemInclude(DriverArgs, CC1Args, Dir);
if (!Dirs.empty())
return;
}
std::string VSDir;
// When built with access to the proper Windows APIs, try to actually find
// the correct include paths first.
if (getVisualStudioInstallDir(VSDir)) {
AddSystemIncludeWithSubfolder(DriverArgs, CC1Args, VSDir, "VC\\include");
std::string WindowsSDKDir;
int major, minor;
if (getWindowsSDKDir(WindowsSDKDir, major, minor)) {
if (major >= 8) {
AddSystemIncludeWithSubfolder(DriverArgs, CC1Args, WindowsSDKDir,
"include\\shared");
AddSystemIncludeWithSubfolder(DriverArgs, CC1Args, WindowsSDKDir,
"include\\um");
AddSystemIncludeWithSubfolder(DriverArgs, CC1Args, WindowsSDKDir,
"include\\winrt");
} else {
AddSystemIncludeWithSubfolder(DriverArgs, CC1Args, WindowsSDKDir,
"include");
}
} else {
addSystemInclude(DriverArgs, CC1Args, VSDir);
}
return;
}
// As a fallback, select default install paths.
// FIXME: Don't guess drives and paths like this on Windows.
const StringRef Paths[] = {
"C:/Program Files/Microsoft Visual Studio 10.0/VC/include",
"C:/Program Files/Microsoft Visual Studio 9.0/VC/include",
"C:/Program Files/Microsoft Visual Studio 9.0/VC/PlatformSDK/Include",
"C:/Program Files/Microsoft Visual Studio 8/VC/include",
"C:/Program Files/Microsoft Visual Studio 8/VC/PlatformSDK/Include"
};
addSystemIncludes(DriverArgs, CC1Args, Paths);
}
void MSVCToolChain::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
ArgStringList &CC1Args) const {
// FIXME: There should probably be logic here to find libc++ on Windows.
}
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