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#include "driver/cpreprocessor.h"
#include "dmd/errors.h"
#include "dmd/timetrace.h"
#include "driver/cl_options.h"
#include "driver/tool.h"
#include "gen/irstate.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Program.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/Target/TargetMachine.h"
namespace {
const char *getPathToImportc_h(Loc loc) {
// importc.h should be next to object.d
static const char *cached = nullptr;
if (!cached) {
cached = FileName::searchPath(global.importPaths, "importc.h", false);
if (!cached) {
error(loc, "cannot find \"importc.h\" along import path");
fatal();
}
#ifdef _WIN32
// if the path to importc.h is relative, cl.exe (but not clang-cl) treats it as relative to the .c file!
cached = FileName::toAbsolute(cached);
#endif
}
return cached;
}
const std::string &getCC(bool isMSVC,
std::vector<std::string> &additional_args) {
static std::string cached_cc;
static std::vector<std::string> cached_args;
if (cached_cc.empty()) {
std::string fallback = "cc";
if (isMSVC) {
#ifdef _WIN32
// by default, prefer clang-cl.exe (if in PATH) over cl.exe
// (e.g., no echoing of source filename being preprocessed to stderr)
auto found = llvm::sys::findProgramByName("clang-cl.exe");
if (found) {
fallback = found.get();
} else {
fallback = "cl.exe";
}
#else
fallback = "clang-cl";
#endif
}
cached_cc = getGcc(cached_args, fallback.c_str());
}
additional_args.insert(additional_args.end(), cached_args.cbegin(), cached_args.cend());
return cached_cc;
}
FileName getOutputPath(Loc loc, const char *csrcfile) {
llvm::SmallString<64> buffer;
// 1) create a new temporary directory (e.g., `/tmp/itmp-ldc-10ecec`)
auto ec = llvm::sys::fs::createUniqueDirectory("itmp-ldc", buffer);
if (ec) {
error(loc,
"failed to create temporary directory for preprocessed .i file: %s\n%s",
buffer.c_str(), ec.message().c_str());
fatal();
}
// 2) append the .c file name, replacing the extension with .i
llvm::sys::path::append(buffer, FileName::name(csrcfile));
llvm::sys::path::replace_extension(buffer, i_ext.ptr);
// the directory is removed (after the file) in Module.read()
return FileName::create(buffer.c_str()); // allocates a copy
}
} // anonymous namespace
FileName runCPreprocessor(FileName csrcfile, Loc loc, OutBuffer &defines) {
dmd::TimeTraceScope timeScope("Preprocess C file", csrcfile.toChars(), loc);
const char *importc_h = getPathToImportc_h(loc);
const auto &triple = *global.params.targetTriple;
const bool isMSVC = triple.isWindowsMSVCEnvironment();
#ifdef _WIN32
windows::MsvcEnvironmentScope msvcEnv;
if (isMSVC)
msvcEnv.setup(/*forPreprocessingOnly=*/true);
#endif
FileName ipath = getOutputPath(loc, csrcfile.toChars());
std::vector<std::string> args;
const std::string &cc = getCC(isMSVC, args);
args.push_back(isMSVC ? "/std:c11" : "-std=c11");
if (!isMSVC)
appendTargetArgsForGcc(args);
if (triple.isOSDarwin())
args.push_back("-fno-blocks"); // disable blocks extension
for (const auto &ccSwitch : opts::ccSwitches) {
args.push_back(ccSwitch);
}
for (const auto &cppSwitch : opts::cppSwitches) {
args.push_back(cppSwitch);
}
if (isMSVC) {
args.push_back("/nologo");
args.push_back("/P"); // preprocess only
const bool isClangCl = llvm::StringRef(cc).contains_insensitive("clang-cl");
if (!isClangCl) {
args.push_back("/PD"); // print all macro definitions
args.push_back("/Zc:preprocessor"); // use the new conforming preprocessor
} else {
// propagate the target to the preprocessor
args.push_back("-target");
args.push_back(triple.getTriple());
#if LDC_LLVM_VER >= 1800 // getAllProcessorFeatures was introduced in this version
// propagate all enabled/disabled features to the preprocessor
const auto &subTarget = gTargetMachine->getMCSubtargetInfo();
const auto &featureBits = subTarget->getFeatureBits();
llvm::SmallString<64> featureString;
for (const auto &feature : subTarget->getAllProcessorFeatures()) {
args.push_back("-Xclang");
args.push_back("-target-feature");
args.push_back("-Xclang");
featureString += featureBits.test(feature.Value) ? '+' : '-';
featureString += feature.Key;
args.push_back(featureString.str().str());
featureString.clear();
}
#endif
// print macro definitions (clang-cl doesn't support /PD - use clang's
// -dD)
args.push_back("-Xclang");
args.push_back("-dD");
// need to redefine some macros in importc.h
args.push_back("-Wno-builtin-macro-redefined");
// disable the clang resource headers (immintrin.h etc.), using
// unsupported types like __int128, __bf16 etc. - stick to the MS headers
args.push_back("-nobuiltininc");
}
args.push_back(csrcfile.toChars());
args.push_back((llvm::Twine("/FI") + importc_h).str());
// preprocessed output file
args.push_back((llvm::Twine("/Fi") + ipath.toChars()).str());
} else { // Posix
// merge #define's with output:
// https://gcc.gnu.org/onlinedocs/cpp/Invocation.html#index-dD
args.push_back("-dD");
// need to redefine some macros in importc.h
args.push_back("-Wno-builtin-macro-redefined");
args.push_back("-E"); // run preprocessor only
args.push_back("-include");
args.push_back(importc_h);
args.push_back(csrcfile.toChars());
args.push_back("-o");
args.push_back(ipath.toChars());
}
const int status = executeToolAndWait(loc, cc, args, global.params.v.verbose);
if (status) {
errorSupplemental(loc, "C preprocessor failed for file '%s'", csrcfile.toChars());
fatal();
}
return ipath;
}
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