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llvisitor.cpp
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llvisitor.cpp
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// Copyright (C) 2022-2023 Exaloop Inc. <https://exaloop.io>
#include "llvisitor.h"
#include <algorithm>
#include <cctype>
#include <cstdlib>
#include <fmt/args.h>
#include <sys/wait.h>
#include <unistd.h>
#include <utility>
#include "codon/cir/dsl/codegen.h"
#include "codon/cir/llvm/optimize.h"
#include "codon/cir/util/irtools.h"
#include "codon/compiler/debug_listener.h"
#include "codon/compiler/memory_manager.h"
#include "codon/parser/common.h"
#include "codon/runtime/lib.h"
#include "codon/util/common.h"
namespace codon {
namespace ir {
namespace {
const std::string EXPORT_ATTR = "std.internal.attributes.export";
const std::string INLINE_ATTR = "std.internal.attributes.inline";
const std::string NOINLINE_ATTR = "std.internal.attributes.noinline";
const std::string GPU_KERNEL_ATTR = "std.gpu.kernel";
} // namespace
llvm::DIFile *LLVMVisitor::DebugInfo::getFile(const std::string &path) {
std::string filename;
std::string directory;
auto pos = path.find_last_of("/");
if (pos != std::string::npos) {
filename = path.substr(pos + 1);
directory = path.substr(0, pos);
} else {
filename = path;
directory = ".";
}
return builder->createFile(filename, directory);
}
std::string LLVMVisitor::getNameForFunction(const Func *x) {
if (isA<ExternalFunc>(x) || util::hasAttribute(x, EXPORT_ATTR)) {
return x->getUnmangledName();
} else if (util::hasAttribute(x, GPU_KERNEL_ATTR)) {
return x->getName();
} else {
return x->referenceString();
}
}
LLVMVisitor::LLVMVisitor()
: util::ConstVisitor(), context(std::make_unique<llvm::LLVMContext>()), M(),
B(std::make_unique<llvm::IRBuilder<>>(*context)), func(nullptr), block(nullptr),
value(nullptr), vars(), funcs(), coro(), loops(), trycatch(), catches(), db(),
plugins(nullptr) {
llvm::InitializeAllTargets();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllAsmPrinters();
llvm::InitializeAllAsmParsers();
// Initialize passes
auto ®istry = *llvm::PassRegistry::getPassRegistry();
llvm::initializeCore(registry);
llvm::initializeScalarOpts(registry);
llvm::initializeObjCARCOpts(registry);
llvm::initializeVectorization(registry);
llvm::initializeIPO(registry);
llvm::initializeAnalysis(registry);
llvm::initializeTransformUtils(registry);
llvm::initializeInstCombine(registry);
llvm::initializeAggressiveInstCombine(registry);
llvm::initializeInstrumentation(registry);
llvm::initializeTarget(registry);
llvm::initializeExpandMemCmpPassPass(registry);
llvm::initializeScalarizeMaskedMemIntrinLegacyPassPass(registry);
llvm::initializeSelectOptimizePass(registry);
llvm::initializeCodeGenPreparePass(registry);
llvm::initializeAtomicExpandPass(registry);
llvm::initializeRewriteSymbolsLegacyPassPass(registry);
llvm::initializeWinEHPreparePass(registry);
llvm::initializeDwarfEHPrepareLegacyPassPass(registry);
llvm::initializeSafeStackLegacyPassPass(registry);
llvm::initializeSjLjEHPreparePass(registry);
llvm::initializePreISelIntrinsicLoweringLegacyPassPass(registry);
llvm::initializeGlobalMergePass(registry);
llvm::initializeIndirectBrExpandPassPass(registry);
llvm::initializeInterleavedLoadCombinePass(registry);
llvm::initializeInterleavedAccessPass(registry);
llvm::initializeUnreachableBlockElimLegacyPassPass(registry);
llvm::initializeExpandReductionsPass(registry);
llvm::initializeExpandVectorPredicationPass(registry);
llvm::initializeWasmEHPreparePass(registry);
llvm::initializeWriteBitcodePassPass(registry);
llvm::initializeHardwareLoopsPass(registry);
llvm::initializeTypePromotionPass(registry);
llvm::initializeReplaceWithVeclibLegacyPass(registry);
llvm::initializeJMCInstrumenterPass(registry);
}
void LLVMVisitor::registerGlobal(const Var *var) {
if (!var->isGlobal())
return;
if (auto *f = cast<Func>(var)) {
insertFunc(f, makeLLVMFunction(f));
} else {
llvm::Type *llvmType = getLLVMType(var->getType());
if (llvmType->isVoidTy()) {
insertVar(var, getDummyVoidValue());
} else {
bool external = var->isExternal();
auto linkage = (db.jit || external) ? llvm::GlobalValue::ExternalLinkage
: llvm::GlobalValue::PrivateLinkage;
auto *storage = new llvm::GlobalVariable(
*M, llvmType, /*isConstant=*/false, linkage,
external ? nullptr : llvm::Constant::getNullValue(llvmType), var->getName());
insertVar(var, storage);
if (external) {
storage->setDSOLocal(true);
} else {
// debug info
auto *srcInfo = getSrcInfo(var);
llvm::DIFile *file = db.getFile(srcInfo->file);
llvm::DIScope *scope = db.unit;
llvm::DIGlobalVariableExpression *debugVar =
db.builder->createGlobalVariableExpression(
scope, getDebugNameForVariable(var), var->getName(), file,
srcInfo->line, getDIType(var->getType()), !var->isExternal());
storage->addDebugInfo(debugVar);
}
}
}
}
llvm::Value *LLVMVisitor::getVar(const Var *var) {
auto it = vars.find(var->getId());
if (db.jit && var->isGlobal()) {
if (it != vars.end()) {
if (!it->second) { // if value is null, it's from another module
// see if it's in the module already
auto name = var->getName();
if (auto *global = M->getNamedValue(name))
return global;
llvm::Type *llvmType = getLLVMType(var->getType());
auto *storage = new llvm::GlobalVariable(*M, llvmType, /*isConstant=*/false,
llvm::GlobalValue::ExternalLinkage,
/*Initializer=*/nullptr, name);
storage->setExternallyInitialized(true);
// debug info
auto *srcInfo = getSrcInfo(var);
llvm::DIFile *file = db.getFile(srcInfo->file);
llvm::DIScope *scope = db.unit;
llvm::DIGlobalVariableExpression *debugVar =
db.builder->createGlobalVariableExpression(
scope, getDebugNameForVariable(var), name, file, srcInfo->line,
getDIType(var->getType()),
/*IsLocalToUnit=*/true);
storage->addDebugInfo(debugVar);
insertVar(var, storage);
return storage;
}
} else {
registerGlobal(var);
it = vars.find(var->getId());
return it->second;
}
}
return (it != vars.end()) ? it->second : nullptr;
}
llvm::Function *LLVMVisitor::getFunc(const Func *func) {
auto it = funcs.find(func->getId());
if (db.jit) {
if (it != funcs.end()) {
if (!it->second) { // if value is null, it's from another module
// see if it's in the module already
const std::string name = getNameForFunction(func);
if (auto *g = M->getFunction(name))
return g;
auto *funcType = cast<types::FuncType>(func->getType());
llvm::Type *returnType = getLLVMType(funcType->getReturnType());
std::vector<llvm::Type *> argTypes;
for (const auto &argType : *funcType) {
argTypes.push_back(getLLVMType(argType));
}
auto *llvmFuncType =
llvm::FunctionType::get(returnType, argTypes, funcType->isVariadic());
auto *g = llvm::Function::Create(llvmFuncType, llvm::Function::ExternalLinkage,
name, M.get());
insertFunc(func, g);
return g;
}
} else {
registerGlobal(func);
it = funcs.find(func->getId());
return it->second;
}
}
return (it != funcs.end()) ? it->second : nullptr;
}
std::unique_ptr<llvm::Module> LLVMVisitor::makeModule(llvm::LLVMContext &context,
const SrcInfo *src) {
auto M = std::make_unique<llvm::Module>("codon", context);
M->setTargetTriple(llvm::EngineBuilder().selectTarget()->getTargetTriple().str());
M->setDataLayout(llvm::EngineBuilder().selectTarget()->createDataLayout());
B = std::make_unique<llvm::IRBuilder<>>(context);
auto *srcInfo = src ? src : getDefaultSrcInfo();
M->setSourceFileName(srcInfo->file);
// debug info setup
db.builder = std::make_unique<llvm::DIBuilder>(*M);
llvm::DIFile *file = db.getFile(srcInfo->file);
db.unit = db.builder->createCompileUnit(llvm::dwarf::DW_LANG_C, file,
("codon version " CODON_VERSION), !db.debug,
db.flags,
/*RV=*/0);
M->addModuleFlag(llvm::Module::Warning, "Debug Info Version",
llvm::DEBUG_METADATA_VERSION);
// darwin only supports dwarf2
if (llvm::Triple(M->getTargetTriple()).isOSDarwin()) {
M->addModuleFlag(llvm::Module::Warning, "Dwarf Version", 2);
}
return M;
}
void LLVMVisitor::clearLLVMData() {
B = {};
func = nullptr;
block = nullptr;
value = nullptr;
for (auto it = funcs.begin(); it != funcs.end();) {
if (it->second && it->second->hasPrivateLinkage()) {
it = funcs.erase(it);
} else {
it->second = nullptr;
++it;
}
}
for (auto it = vars.begin(); it != vars.end();) {
if (it->second && !llvm::isa<llvm::GlobalValue>(it->second)) {
it = vars.erase(it);
} else {
it->second = nullptr;
++it;
}
}
coro.reset();
loops.clear();
trycatch.clear();
catches.clear();
db.reset();
context = {};
M = {};
}
std::pair<std::unique_ptr<llvm::Module>, std::unique_ptr<llvm::LLVMContext>>
LLVMVisitor::takeModule(Module *module, const SrcInfo *src) {
// process any new functions or globals
if (module) {
std::unordered_set<id_t> funcsToProcess;
for (auto *var : *module) {
auto id = var->getId();
if (auto *func = cast<Func>(var)) {
if (funcs.find(id) != funcs.end())
continue;
else
funcsToProcess.insert(id);
} else {
if (vars.find(id) != vars.end())
continue;
}
registerGlobal(var);
}
for (auto *var : *module) {
if (auto *func = cast<Func>(var)) {
if (funcsToProcess.find(func->getId()) != funcsToProcess.end()) {
process(func);
}
}
}
}
db.builder->finalize();
auto currentContext = std::move(context);
auto currentModule = std::move(M);
// reset all LLVM fields/data -- they are owned by the context
clearLLVMData();
context = std::make_unique<llvm::LLVMContext>();
M = makeModule(*context, src);
return {std::move(currentModule), std::move(currentContext)};
}
void LLVMVisitor::setDebugInfoForNode(const Node *x) {
if (x && func) {
auto *srcInfo = getSrcInfo(x);
B->SetCurrentDebugLocation(llvm::DILocation::get(
*context, srcInfo->line, srcInfo->col, func->getSubprogram()));
} else {
B->SetCurrentDebugLocation(llvm::DebugLoc());
}
}
void LLVMVisitor::process(const Node *x) {
setDebugInfoForNode(x);
x->accept(*this);
}
void LLVMVisitor::dump(const std::string &filename) { writeToLLFile(filename, false); }
void LLVMVisitor::runLLVMPipeline() {
db.builder->finalize();
optimize(M.get(), db.debug, db.jit, plugins);
}
void LLVMVisitor::writeToObjectFile(const std::string &filename, bool pic) {
runLLVMPipeline();
std::error_code err;
auto out =
std::make_unique<llvm::ToolOutputFile>(filename, err, llvm::sys::fs::OF_None);
if (err)
compilationError(err.message());
llvm::raw_pwrite_stream *os = &out->os();
auto machine = getTargetMachine(M.get(), /*setFunctionAttributes=*/false, pic);
auto &llvmtm = static_cast<llvm::LLVMTargetMachine &>(*machine);
auto *mmiwp = new llvm::MachineModuleInfoWrapperPass(&llvmtm);
llvm::legacy::PassManager pm;
llvm::TargetLibraryInfoImpl tlii(llvm::Triple(M->getTargetTriple()));
pm.add(new llvm::TargetLibraryInfoWrapperPass(tlii));
seqassertn(!machine->addPassesToEmitFile(pm, *os, nullptr, llvm::CGFT_ObjectFile,
/*DisableVerify=*/true, mmiwp),
"could not add passes");
const_cast<llvm::TargetLoweringObjectFile *>(llvmtm.getObjFileLowering())
->Initialize(mmiwp->getMMI().getContext(), *machine);
pm.run(*M);
out->keep();
}
void LLVMVisitor::writeToBitcodeFile(const std::string &filename) {
runLLVMPipeline();
std::error_code err;
llvm::raw_fd_ostream stream(filename, err, llvm::sys::fs::OF_None);
llvm::WriteBitcodeToFile(*M, stream);
if (err) {
compilationError(err.message());
}
}
void LLVMVisitor::writeToLLFile(const std::string &filename, bool optimize) {
if (optimize)
runLLVMPipeline();
auto fo = fopen(filename.c_str(), "w");
llvm::raw_fd_ostream fout(fileno(fo), true);
fout << *M;
fout.close();
}
namespace {
void executeCommand(const std::vector<std::string> &args) {
std::vector<const char *> cArgs;
for (auto &arg : args) {
cArgs.push_back(arg.c_str());
}
LOG_USER("Executing '{}'", fmt::join(cArgs, " "));
cArgs.push_back(nullptr);
if (fork() == 0) {
int status = execvp(cArgs[0], (char *const *)&cArgs[0]);
exit(status);
} else {
int status;
if (wait(&status) < 0) {
compilationError("process for '" + args[0] + "' encountered an error in wait");
}
if (WEXITSTATUS(status) != 0) {
compilationError("process for '" + args[0] + "' exited with status " +
std::to_string(WEXITSTATUS(status)));
}
}
}
} // namespace
void LLVMVisitor::setupGlobalCtorForSharedLibrary() {
const std::string llvmCtor = "llvm.global_ctors";
auto *main = M->getFunction("main");
main->setName(".main"); // avoid clash with other main
if (M->getNamedValue(llvmCtor) || !main)
return;
auto *ctorFuncTy = llvm::FunctionType::get(B->getVoidTy(), {}, /*isVarArg=*/false);
auto *ctorEntryTy = llvm::StructType::get(B->getInt32Ty(), ctorFuncTy->getPointerTo(),
B->getInt8PtrTy());
auto *ctorArrayTy = llvm::ArrayType::get(ctorEntryTy, 1);
auto *ctor = cast<llvm::Function>(
M->getOrInsertFunction(".main.ctor", ctorFuncTy).getCallee());
ctor->setLinkage(llvm::GlobalValue::InternalLinkage);
auto *entry = llvm::BasicBlock::Create(*context, "entry", ctor);
B->SetInsertPoint(entry);
B->CreateCall({main->getFunctionType(), main},
{B->getInt32(0),
llvm::ConstantPointerNull::get(B->getInt8PtrTy()->getPointerTo())});
B->CreateRetVoid();
const int priority = 65535; // default
auto *ctorEntry = llvm::ConstantStruct::get(
ctorEntryTy,
{B->getInt32(priority), ctor, llvm::ConstantPointerNull::get(B->getInt8PtrTy())});
new llvm::GlobalVariable(*M, ctorArrayTy,
/*isConstant=*/true, llvm::GlobalValue::AppendingLinkage,
llvm::ConstantArray::get(ctorArrayTy, {ctorEntry}),
llvmCtor);
}
void LLVMVisitor::writeToExecutable(const std::string &filename,
const std::string &argv0, bool library,
const std::vector<std::string> &libs,
const std::string &lflags) {
if (library)
setupGlobalCtorForSharedLibrary();
const std::string objFile = filename + ".o";
writeToObjectFile(objFile, /*pic=*/library);
const std::string base = ast::executable_path(argv0.c_str());
auto path = llvm::SmallString<128>(llvm::sys::path::parent_path(base));
std::vector<std::string> relatives = {"../lib", "../lib/codon"};
std::vector<std::string> rpaths;
for (const auto &rel : relatives) {
auto newPath = path;
llvm::sys::path::append(newPath, rel);
llvm::sys::path::remove_dots(newPath, /*remove_dot_dot=*/true);
if (llvm::sys::fs::exists(newPath)) {
rpaths.push_back(std::string(newPath));
}
}
if (rpaths.empty()) {
rpaths.push_back(std::string(path));
}
std::vector<std::string> command = {"gcc"};
// Avoid "argument unused during compilation" warning
command.push_back("-Wno-unused-command-line-argument");
// MUST go before -llib to compile on Linux
command.push_back(objFile);
if (library)
command.push_back("-shared");
for (const auto &rpath : rpaths) {
if (!rpath.empty()) {
command.push_back("-L" + rpath);
command.push_back("-Wl,-rpath," + rpath);
}
}
if (plugins) {
for (auto *plugin : *plugins) {
auto dylibPath = plugin->info.dylibPath;
if (dylibPath.empty())
continue;
llvm::SmallString<128> rpath0 = llvm::sys::path::parent_path(dylibPath);
llvm::sys::fs::make_absolute(rpath0);
llvm::StringRef rpath = rpath0.str();
if (!rpath.empty()) {
command.push_back("-L" + rpath.str());
command.push_back("-Wl,-rpath," + rpath.str());
}
}
}
for (const auto &lib : libs) {
command.push_back("-l" + lib);
}
if (plugins) {
for (auto *plugin : *plugins) {
auto dylibPath = plugin->info.dylibPath;
if (dylibPath.empty())
continue;
auto stem = llvm::sys::path::stem(dylibPath);
if (stem.startswith("lib"))
stem = stem.substr(3);
command.push_back("-l" + stem.str());
}
}
std::vector<std::string> extraArgs = {
"-lcodonrt", "-lomp", "-lpthread", "-ldl", "-lz", "-lm", "-lc", "-o", filename};
for (const auto &arg : extraArgs) {
command.push_back(arg);
}
llvm::SmallVector<llvm::StringRef> userFlags(16);
llvm::StringRef(lflags).split(userFlags, " ", /*MaxSplit=*/-1, /*KeepEmpty=*/false);
for (const auto &uflag : userFlags) {
if (!uflag.empty())
command.push_back(uflag.str());
}
// Avoid "relocation R_X86_64_32 against `.bss' can not be used when making a PIE
// object" complaints by gcc when it is built with --enable-default-pie
if (!library)
command.push_back("-no-pie");
executeCommand(command);
#if __APPLE__
if (db.debug)
executeCommand({"dsymutil", filename});
#endif
llvm::sys::fs::remove(objFile);
}
void LLVMVisitor::compile(const std::string &filename, const std::string &argv0,
const std::vector<std::string> &libs,
const std::string &lflags) {
llvm::StringRef f(filename);
if (f.endswith(".ll")) {
writeToLLFile(filename);
} else if (f.endswith(".bc")) {
writeToBitcodeFile(filename);
} else if (f.endswith(".o") || f.endswith(".obj")) {
writeToObjectFile(filename);
} else if (f.endswith(".so") || f.endswith(".dylib")) {
writeToExecutable(filename, argv0, /*library=*/true, libs, lflags);
} else {
writeToExecutable(filename, argv0, /*library=*/false, libs, lflags);
}
}
void LLVMVisitor::run(const std::vector<std::string> &args,
const std::vector<std::string> &libs, const char *const *envp) {
runLLVMPipeline();
Timer t1("llvm/jitlink");
for (auto &lib : libs) {
std::string err;
if (llvm::sys::DynamicLibrary::LoadLibraryPermanently(lib.c_str(), &err)) {
compilationError(err);
}
}
DebugPlugin *dbp = nullptr;
llvm::Triple triple(M->getTargetTriple());
auto epc = llvm::cantFail(llvm::orc::SelfExecutorProcessControl::Create(
std::make_shared<llvm::orc::SymbolStringPool>()));
llvm::orc::LLJITBuilder builder;
builder.setDataLayout(llvm::DataLayout(M.get()));
builder.setObjectLinkingLayerCreator(
[&epc, &dbp](llvm::orc::ExecutionSession &es, const llvm::Triple &triple)
-> llvm::Expected<std::unique_ptr<llvm::orc::ObjectLayer>> {
auto L = std::make_unique<llvm::orc::ObjectLinkingLayer>(
es, llvm::cantFail(BoehmGCJITLinkMemoryManager::Create()));
L->addPlugin(std::make_unique<llvm::orc::EHFrameRegistrationPlugin>(
es, llvm::cantFail(llvm::orc::EPCEHFrameRegistrar::Create(es))));
L->addPlugin(std::make_unique<llvm::orc::DebugObjectManagerPlugin>(
es, llvm::cantFail(llvm::orc::createJITLoaderGDBRegistrar(es))));
auto dbPlugin = std::make_unique<DebugPlugin>();
dbp = dbPlugin.get();
L->addPlugin(std::move(dbPlugin));
return L;
});
builder.setJITTargetMachineBuilder(llvm::orc::JITTargetMachineBuilder(triple));
auto jit = llvm::cantFail(builder.create());
jit->getMainJITDylib().addGenerator(
llvm::cantFail(llvm::orc::DynamicLibrarySearchGenerator::GetForCurrentProcess(
jit->getDataLayout().getGlobalPrefix())));
llvm::cantFail(jit->addIRModule({std::move(M), std::move(context)}));
clearLLVMData();
auto mainAddr = llvm::cantFail(jit->lookup("main"));
if (db.debug) {
runtime::setJITErrorCallback([dbp](const runtime::JITError &e) {
fmt::print(stderr, "{}\n{}", e.getOutput(),
dbp->getPrettyBacktrace(e.getBacktrace()));
std::abort();
});
} else {
runtime::setJITErrorCallback([](const runtime::JITError &e) {
fmt::print(stderr, "{}", e.getOutput());
std::abort();
});
}
t1.log();
try {
llvm::cantFail(epc->runAsMain(mainAddr, args));
} catch (const runtime::JITError &e) {
fmt::print(stderr, "{}\n", e.getOutput());
std::abort();
}
}
llvm::FunctionCallee LLVMVisitor::makeAllocFunc(bool atomic) {
auto f = M->getOrInsertFunction(atomic ? "seq_alloc_atomic" : "seq_alloc",
B->getInt8PtrTy(), B->getInt64Ty());
auto *g = cast<llvm::Function>(f.getCallee());
g->setDoesNotThrow();
g->setReturnDoesNotAlias();
g->setOnlyAccessesInaccessibleMemory();
return f;
}
llvm::FunctionCallee LLVMVisitor::makePersonalityFunc() {
return M->getOrInsertFunction("seq_personality", B->getInt32Ty(), B->getInt32Ty(),
B->getInt32Ty(), B->getInt64Ty(), B->getInt8PtrTy(),
B->getInt8PtrTy());
}
llvm::FunctionCallee LLVMVisitor::makeExcAllocFunc() {
auto f = M->getOrInsertFunction("seq_alloc_exc", B->getInt8PtrTy(), B->getInt32Ty(),
B->getInt8PtrTy());
auto *g = cast<llvm::Function>(f.getCallee());
g->setDoesNotThrow();
return f;
}
llvm::FunctionCallee LLVMVisitor::makeThrowFunc() {
auto f = M->getOrInsertFunction("seq_throw", B->getVoidTy(), B->getInt8PtrTy());
auto *g = cast<llvm::Function>(f.getCallee());
g->setDoesNotReturn();
return f;
}
llvm::FunctionCallee LLVMVisitor::makeTerminateFunc() {
auto f = M->getOrInsertFunction("seq_terminate", B->getVoidTy(), B->getInt8PtrTy());
auto *g = cast<llvm::Function>(f.getCallee());
g->setDoesNotReturn();
return f;
}
llvm::StructType *LLVMVisitor::getTypeInfoType() {
return llvm::StructType::get(B->getInt32Ty());
}
llvm::StructType *LLVMVisitor::getPadType() {
return llvm::StructType::get(B->getInt8PtrTy(), B->getInt32Ty());
}
llvm::StructType *LLVMVisitor::getExceptionType() {
return llvm::StructType::get(getTypeInfoType(), B->getInt8PtrTy());
}
namespace {
int typeIdxLookup(const std::string &name) {
static std::unordered_map<std::string, int> cache;
static int next = 1000;
if (name.empty())
return 0;
auto it = cache.find(name);
if (it != cache.end()) {
return it->second;
} else {
const int myID = next++;
cache[name] = myID;
return myID;
}
}
} // namespace
llvm::GlobalVariable *LLVMVisitor::getTypeIdxVar(const std::string &name) {
auto *typeInfoType = getTypeInfoType();
const std::string typeVarName = "codon.typeidx." + (name.empty() ? "<all>" : name);
llvm::GlobalVariable *tidx = M->getGlobalVariable(typeVarName);
int idx = typeIdxLookup(name);
if (!tidx) {
tidx = new llvm::GlobalVariable(
*M, typeInfoType, /*isConstant=*/true, llvm::GlobalValue::PrivateLinkage,
llvm::ConstantStruct::get(typeInfoType, B->getInt32(idx)), typeVarName);
}
return tidx;
}
llvm::GlobalVariable *LLVMVisitor::getTypeIdxVar(types::Type *catchType) {
return getTypeIdxVar(catchType ? catchType->getName() : "");
}
int LLVMVisitor::getTypeIdx(types::Type *catchType) {
return typeIdxLookup(catchType ? catchType->getName() : "");
}
llvm::Value *LLVMVisitor::call(llvm::FunctionCallee callee,
llvm::ArrayRef<llvm::Value *> args) {
B->SetInsertPoint(block);
if (trycatch.empty()) {
return B->CreateCall(callee, args);
} else {
auto *normalBlock = llvm::BasicBlock::Create(*context, "invoke.normal", func);
auto *unwindBlock = trycatch.back().exceptionBlock;
auto *result = B->CreateInvoke(callee, normalBlock, unwindBlock, args);
block = normalBlock;
return result;
}
}
static int nextSequenceNumber = 0;
void LLVMVisitor::enterLoop(LoopData data) {
loops.push_back(std::move(data));
loops.back().sequenceNumber = nextSequenceNumber++;
}
void LLVMVisitor::exitLoop() {
seqassertn(!loops.empty(), "no loops present");
loops.pop_back();
}
void LLVMVisitor::enterTryCatch(TryCatchData data) {
trycatch.push_back(std::move(data));
trycatch.back().sequenceNumber = nextSequenceNumber++;
}
void LLVMVisitor::exitTryCatch() {
seqassertn(!trycatch.empty(), "no try catches present");
trycatch.pop_back();
}
void LLVMVisitor::enterCatch(CatchData data) {
catches.push_back(std::move(data));
catches.back().sequenceNumber = nextSequenceNumber++;
}
void LLVMVisitor::exitCatch() {
seqassertn(!catches.empty(), "no catches present");
catches.pop_back();
}
LLVMVisitor::TryCatchData *LLVMVisitor::getInnermostTryCatch() {
return trycatch.empty() ? nullptr : &trycatch.back();
}
LLVMVisitor::TryCatchData *LLVMVisitor::getInnermostTryCatchBeforeLoop() {
if (!trycatch.empty() &&
(loops.empty() || trycatch.back().sequenceNumber > loops.back().sequenceNumber))
return &trycatch.back();
return nullptr;
}
/*
* General values, M, functions, vars
*/
void LLVMVisitor::visit(const Module *x) {
// initialize M
M = makeModule(*context, getSrcInfo(x));
// args variable
seqassertn(x->getArgVar()->isGlobal(), "arg var is not global");
registerGlobal(x->getArgVar());
// set up global variables and initialize functions
for (auto *var : *x) {
registerGlobal(var);
}
// process functions
for (auto *var : *x) {
if (auto *f = cast<Func>(var)) {
process(f);
}
}
const Func *main = x->getMainFunc();
llvm::FunctionCallee realMain = makeLLVMFunction(main);
process(main);
setDebugInfoForNode(nullptr);
// build canonical main function
auto *strType = llvm::StructType::get(*context, {B->getInt64Ty(), B->getInt8PtrTy()});
auto *arrType =
llvm::StructType::get(*context, {B->getInt64Ty(), strType->getPointerTo()});
auto *initFunc = llvm::cast<llvm::Function>(
M->getOrInsertFunction("seq_init", B->getVoidTy(), B->getInt32Ty()).getCallee());
auto *strlenFunc = llvm::cast<llvm::Function>(
M->getOrInsertFunction("strlen", B->getInt64Ty(), B->getInt8PtrTy()).getCallee());
auto *canonicalMainFunc = llvm::cast<llvm::Function>(
M->getOrInsertFunction("main", B->getInt32Ty(), B->getInt32Ty(),
B->getInt8PtrTy()->getPointerTo())
.getCallee());
canonicalMainFunc->setPersonalityFn(
llvm::cast<llvm::Constant>(makePersonalityFunc().getCallee()));
auto argiter = canonicalMainFunc->arg_begin();
llvm::Value *argc = argiter++;
llvm::Value *argv = argiter;
argc->setName("argc");
argv->setName("argv");
// The following generates code to put program arguments in an array, i.e.:
// for (int i = 0; i < argc; i++)
// array[i] = {strlen(argv[i]), argv[i]}
auto *entryBlock = llvm::BasicBlock::Create(*context, "entry", canonicalMainFunc);
auto *loopBlock = llvm::BasicBlock::Create(*context, "loop", canonicalMainFunc);
auto *bodyBlock = llvm::BasicBlock::Create(*context, "body", canonicalMainFunc);
auto *exitBlock = llvm::BasicBlock::Create(*context, "exit", canonicalMainFunc);
B->SetInsertPoint(entryBlock);
auto allocFunc = makeAllocFunc(/*atomic=*/false);
llvm::Value *len = B->CreateZExt(argc, B->getInt64Ty());
llvm::Value *elemSize = B->getInt64(M->getDataLayout().getTypeAllocSize(strType));
llvm::Value *allocSize = B->CreateMul(len, elemSize);
llvm::Value *ptr = B->CreateCall(allocFunc, allocSize);
ptr = B->CreateBitCast(ptr, strType->getPointerTo());
llvm::Value *arr = llvm::UndefValue::get(arrType);
arr = B->CreateInsertValue(arr, len, 0);
arr = B->CreateInsertValue(arr, ptr, 1);
B->CreateBr(loopBlock);
B->SetInsertPoint(loopBlock);
llvm::PHINode *control = B->CreatePHI(B->getInt32Ty(), 2, "i");
llvm::Value *next = B->CreateAdd(control, B->getInt32(1), "next");
llvm::Value *cond = B->CreateICmpSLT(control, argc);
control->addIncoming(B->getInt32(0), entryBlock);
control->addIncoming(next, bodyBlock);
B->CreateCondBr(cond, bodyBlock, exitBlock);
B->SetInsertPoint(bodyBlock);
llvm::Value *arg =
B->CreateLoad(B->getInt8PtrTy(), B->CreateGEP(B->getInt8PtrTy(), argv, control));
llvm::Value *argLen =
B->CreateZExtOrTrunc(B->CreateCall(strlenFunc, arg), B->getInt64Ty());
llvm::Value *str = llvm::UndefValue::get(strType);
str = B->CreateInsertValue(str, argLen, 0);
str = B->CreateInsertValue(str, arg, 1);
B->CreateStore(str, B->CreateGEP(strType, ptr, control));
B->CreateBr(loopBlock);
B->SetInsertPoint(exitBlock);
llvm::Value *argStorage = getVar(x->getArgVar());
seqassertn(argStorage, "argument storage missing");
B->CreateStore(arr, argStorage);
const int flags = (db.debug ? SEQ_FLAG_DEBUG : 0) |
(db.capture ? SEQ_FLAG_CAPTURE_OUTPUT : 0) |
(db.standalone ? SEQ_FLAG_STANDALONE : 0);
B->CreateCall(initFunc, B->getInt32(flags));
// Put the entire program in a new function
{
auto *proxyMainTy = llvm::FunctionType::get(B->getVoidTy(), {}, false);
auto *proxyMain = llvm::cast<llvm::Function>(
M->getOrInsertFunction("codon.proxy_main", proxyMainTy).getCallee());
proxyMain->setLinkage(llvm::GlobalValue::PrivateLinkage);
proxyMain->setPersonalityFn(
llvm::cast<llvm::Constant>(makePersonalityFunc().getCallee()));
auto *proxyBlockEntry = llvm::BasicBlock::Create(*context, "entry", proxyMain);
auto *proxyBlockMain = llvm::BasicBlock::Create(*context, "main", proxyMain);
auto *proxyBlockExit = llvm::BasicBlock::Create(*context, "exit", proxyMain);
B->SetInsertPoint(proxyBlockEntry);
llvm::Value *shouldExit = B->getFalse();
B->CreateCondBr(shouldExit, proxyBlockExit, proxyBlockMain);
B->SetInsertPoint(proxyBlockExit);
B->CreateRetVoid();
// invoke real main
auto *normal = llvm::BasicBlock::Create(*context, "normal", proxyMain);
auto *unwind = llvm::BasicBlock::Create(*context, "unwind", proxyMain);
B->SetInsertPoint(proxyBlockMain);
B->CreateInvoke(realMain, normal, unwind);
B->SetInsertPoint(unwind);
llvm::LandingPadInst *caughtResult = B->CreateLandingPad(getPadType(), 1);
caughtResult->setCleanup(true);
caughtResult->addClause(getTypeIdxVar(nullptr));
llvm::Value *unwindException = B->CreateExtractValue(caughtResult, 0);
B->CreateCall(makeTerminateFunc(), unwindException);
B->CreateUnreachable();
B->SetInsertPoint(normal);
B->CreateRetVoid();
// actually make the call
B->SetInsertPoint(exitBlock);
B->CreateCall(proxyMain);
}
B->SetInsertPoint(exitBlock);
B->CreateRet(B->getInt32(0));
}
llvm::DISubprogram *LLVMVisitor::getDISubprogramForFunc(const Func *x) {
auto *srcInfo = getSrcInfo(x);
llvm::DIFile *file = db.getFile(srcInfo->file);
auto *derivedType = llvm::cast<llvm::DIDerivedType>(getDIType(x->getType()));
auto *subroutineType =
llvm::cast<llvm::DISubroutineType>(derivedType->getRawBaseType());
std::string baseName = x->getUnmangledName();
if (auto *parent = x->getParentType())
baseName = parent->getName() + "." + baseName;
llvm::DISubprogram *subprogram = db.builder->createFunction(
file, baseName, getNameForFunction(x), file, srcInfo->line, subroutineType,
/*ScopeLine=*/0, llvm::DINode::FlagZero,
llvm::DISubprogram::toSPFlags(/*IsLocalToUnit=*/true,
/*IsDefinition=*/true, /*IsOptimized=*/!db.debug));
return subprogram;
}
llvm::Function *LLVMVisitor::makeLLVMFunction(const Func *x) {
// process LLVM functions in full immediately
if (auto *llvmFunc = cast<LLVMFunc>(x)) {
auto *oldFunc = func;
process(llvmFunc);
setDebugInfoForNode(nullptr);
auto *newFunc = func;
func = oldFunc;
return newFunc;
}
auto *funcType = cast<types::FuncType>(x->getType());
llvm::Type *returnType = getLLVMType(funcType->getReturnType());
std::vector<llvm::Type *> argTypes;
for (const auto &argType : *funcType) {
argTypes.push_back(getLLVMType(argType));
}
auto *llvmFuncType =
llvm::FunctionType::get(returnType, argTypes, funcType->isVariadic());
const std::string functionName = getNameForFunction(x);
auto *f = llvm::cast<llvm::Function>(
M->getOrInsertFunction(functionName, llvmFuncType).getCallee());
if (!cast<ExternalFunc>(x)) {
f->setSubprogram(getDISubprogramForFunc(x));
}
return f;
}
void LLVMVisitor::makeYield(llvm::Value *value, bool finalYield) {
B->SetInsertPoint(block);
if (value) {
seqassertn(coro.promise, "promise is null");
B->CreateStore(value, coro.promise);
}
llvm::FunctionCallee coroSuspend =
llvm::Intrinsic::getDeclaration(M.get(), llvm::Intrinsic::coro_suspend);
llvm::Value *suspendResult = B->CreateCall(
coroSuspend, {llvm::ConstantTokenNone::get(*context), B->getInt1(finalYield)});
block = llvm::BasicBlock::Create(*context, "yield.new", func);
llvm::SwitchInst *inst = B->CreateSwitch(suspendResult, coro.suspend, 2);
inst->addCase(B->getInt8(0), block);
inst->addCase(B->getInt8(1), coro.cleanup);
}
void LLVMVisitor::visit(const ExternalFunc *x) {
func = M->getFunction(getNameForFunction(x));
coro = {};
seqassertn(func, "{} not inserted", *x);
func->setDoesNotThrow();
}
namespace {
// internal function type checking
template <typename ParentType>
bool internalFuncMatchesIgnoreArgs(const std::string &name, const InternalFunc *x) {
return name == x->getUnmangledName() && cast<ParentType>(x->getParentType());
}
template <typename ParentType, typename... ArgTypes, std::size_t... Index>
bool internalFuncMatches(const std::string &name, const InternalFunc *x,
std::index_sequence<Index...>) {
auto *funcType = cast<types::FuncType>(x->getType());
if (name != x->getUnmangledName() ||