mirror of
https://github.com/ldc-developers/ldc.git
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305 lines
8.5 KiB
C++
305 lines
8.5 KiB
C++
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#include <cassert>
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#include <stdexcept>
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#include <map>
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#include "optimizer.h"
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#include "context.h"
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#include "utils.h"
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#include "callback_ostream.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/ExecutionEngine/ExecutionEngine.h"
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#include "llvm/ExecutionEngine/RuntimeDyld.h"
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#include "llvm/ExecutionEngine/SectionMemoryManager.h"
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#include "llvm/ExecutionEngine/JITSymbol.h"
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#include "llvm/ExecutionEngine/Orc/CompileUtils.h"
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#include "llvm/ExecutionEngine/Orc/IRCompileLayer.h"
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#include "llvm/ExecutionEngine/Orc/LambdaResolver.h"
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#if LDC_LLVM_VER >= 500
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#include "llvm/ExecutionEngine/Orc/RTDyldObjectLinkingLayer.h"
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#else
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#include "llvm/ExecutionEngine/Orc/ObjectLinkingLayer.h"
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#endif
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#include "llvm/Support/DynamicLibrary.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/TargetSelect.h"
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#include "llvm/Support/Host.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Bitcode/BitcodeReader.h"
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namespace {
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#pragma pack(push,1)
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struct RtCompileFuncList
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{
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const char* name;
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void** func;
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};
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struct RtCompileSymList
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{
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const char* name;
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void* sym;
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};
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struct RtCompileVarList
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{
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const char* name;
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const void* init;
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};
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struct RtComileModuleList
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{
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RtComileModuleList* next;
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const char* irData;
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int irDataSize;
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RtCompileFuncList* funcList;
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int funcListSize;
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RtCompileSymList* symList;
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int symListSize;
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RtCompileVarList* varList;
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int varListSize;
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};
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#pragma pack(pop)
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llvm::SmallVector<std::string, 4> getHostAttrs() {
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llvm::SmallVector<std::string, 4> features;
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llvm::StringMap<bool> hostFeatures;
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if (llvm::sys::getHostCPUFeatures(hostFeatures)) {
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for (auto &&f : hostFeatures) {
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features.push_back(((f.second ? "+" : "-") + f.first()).str());
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}
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}
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return features;
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}
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using SymMap = std::map<std::string, void*>;
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struct llvm_init_obj {
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llvm_init_obj() {
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llvm::InitializeNativeTarget();
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llvm::InitializeNativeTargetAsmPrinter();
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}
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};
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class MyJIT {
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private:
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llvm_init_obj initObj;
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llvm::llvm_shutdown_obj shutdownObj;
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std::unique_ptr<llvm::TargetMachine> targetmachine;
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const llvm::DataLayout dataLayout;
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#if LDC_LLVM_VER >= 500
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using ObjectLayerT = llvm::orc::RTDyldObjectLinkingLayer<>;
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#else
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using ObjectLayerT = llvm::orc::ObjectLinkingLayer<>;
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#endif
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ObjectLayerT objectLayer;
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using CompileLayerT = llvm::orc::IRCompileLayer<ObjectLayerT>;
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CompileLayerT compileLayer;
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llvm::LLVMContext context;
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typedef CompileLayerT::ModuleSetHandleT ModuleHandleT;
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bool compiled = false;
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ModuleHandleT moduleHandle;
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public:
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MyJIT():
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targetmachine(llvm::EngineBuilder()
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.setRelocationModel(llvm::Reloc::Static)
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.selectTarget(llvm::Triple(llvm::sys::getProcessTriple()),
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llvm::StringRef(),
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llvm::sys::getHostCPUName(),
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getHostAttrs())),
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dataLayout(targetmachine->createDataLayout()),
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compileLayer(objectLayer, llvm::orc::SimpleCompiler(*targetmachine))
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{
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llvm::sys::DynamicLibrary::LoadLibraryPermanently(nullptr);
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}
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llvm::TargetMachine& getTargetMachine() { return *targetmachine; }
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void addModules(std::vector<std::unique_ptr<llvm::Module>> &&modules,
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const SymMap& symMap) {
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reset();
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// Build our symbol resolver:
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// Lambda 1: Look back into the JIT itself to find symbols that are part of
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// the same "logical dylib".
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// Lambda 2: Search for external symbols in the host process.
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auto Resolver = llvm::orc::createLambdaResolver(
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[&](const std::string& name) {
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if (auto Sym = compileLayer.findSymbol(name, false)) {
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return Sym;
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}
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return llvm::JITSymbol(nullptr);
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},
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[&](const std::string& name) {
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auto it = symMap.find(name);
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if (symMap.end() != it) {
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return llvm::JITSymbol(reinterpret_cast<llvm::JITTargetAddress>(it->second),
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llvm::JITSymbolFlags::Exported);
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}
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if (auto SymAddr = llvm::RTDyldMemoryManager::getSymbolAddressInProcess(name)) {
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return llvm::JITSymbol(SymAddr, llvm::JITSymbolFlags::Exported);
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}
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return llvm::JITSymbol(nullptr);
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});
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// Add the set to the JIT with the resolver we created above and a newly
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// created SectionMemoryManager.
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moduleHandle = compileLayer.addModuleSet(std::move(modules),
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llvm::make_unique<llvm::SectionMemoryManager>(),
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std::move(Resolver));
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compiled = true;
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}
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llvm::JITSymbol findSymbol(const std::string &name) {
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return compileLayer.findSymbol(name, false);
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}
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llvm::LLVMContext& getContext() { return context; }
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// void removeModule(ModuleHandle H) {
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// CompileLayer.removeModuleSet(H);
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// }
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void reset() {
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if (compiled) {
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compileLayer.removeModuleSet(moduleHandle);
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compiled = false;
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}
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}
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};
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void setRtCompileVars(const Context &context,
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llvm::Module& module,
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llvm::ArrayRef<RtCompileVarList> vals) {
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for (auto&& val: vals) {
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setRtCompileVar(context, module, val.name, val.init);
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}
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}
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template<typename T>
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llvm::ArrayRef<T> toArray(T* ptr, size_t size) {
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return llvm::ArrayRef<T>(ptr, size);
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}
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struct JitFinaliser final {
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MyJIT& jit;
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bool finalized = false;
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explicit JitFinaliser(MyJIT& j):
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jit(j) {}
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~JitFinaliser() {
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if (!finalized) {
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jit.reset();
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}
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}
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void finalze() { finalized = true; }
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};
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MyJIT& getJit()
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{
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static MyJIT jit;
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return jit;
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}
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void rtCompileProcessImplSoInternal(const RtComileModuleList* modlist_head, const Context& context) {
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interruptPoint(context, "Init");
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MyJIT& myJit = getJit();
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auto current = modlist_head;
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std::vector<std::pair<std::string, void**> > functions;
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std::vector<std::unique_ptr<llvm::Module>> ms;
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SymMap symMap;
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OptimizerSettings settings;
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settings.optLevel = context.optLevel;
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settings.sizeLeve = context.sizeLeve;
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while (nullptr != current) {
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interruptPoint(context, "load IR");
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auto buff = llvm::MemoryBuffer::getMemBuffer(llvm::StringRef(current->irData, current->irDataSize), "", false);
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interruptPoint(context, "parse IR");
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auto mod = llvm::parseBitcodeFile(*buff, myJit.getContext());
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if (!mod) {
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fatal(context, "Unable to parse IR");
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}
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else {
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llvm::Module& module = **mod;
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const auto name = module.getName();
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interruptPoint(context,"Verify module", name.data());
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::verifyModule(context, module);
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module.setDataLayout(myJit.getTargetMachine().createDataLayout());
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interruptPoint(context, "setRtCompileVars", name.data());
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setRtCompileVars(context,
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module,
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toArray(current->varList, current->varListSize));
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interruptPoint(context, "Optimize module", name.data());
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optimizeModule(context, myJit.getTargetMachine(), settings, module);
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interruptPoint(context, "Verify module", name.data());
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::verifyModule(context, module);
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if (nullptr != context.dumpHandler) {
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auto callback =[&](const char* str, size_t len) {
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context.dumpHandler(context.dumpHandlerData, str, len);
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};
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CallbackOstream os(callback);
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module.print(os, nullptr, false, true);
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}
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ms.push_back(std::move(*mod));
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for (auto&& fun: toArray(current->funcList, current->funcListSize)) {
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functions.push_back(std::make_pair(fun.name, fun.func));
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}
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for (auto&& sym: toArray(current->symList, current->symListSize)) {
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symMap.insert(std::make_pair(sym.name, sym.sym));
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}
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}
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current = current->next;
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}
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interruptPoint(context, "Add modules");
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myJit.addModules(std::move(ms), symMap);
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JitFinaliser jitFinalizer(myJit);
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interruptPoint(context, "Resolve functions");
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for (auto&& fun: functions) {
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auto symbol = myJit.findSymbol(fun.first);
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const auto addr = symbol.getAddress();
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if (0 == addr) {
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std::string desc = std::string("Symbol not found in jitted code: ") + fun.first;
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fatal(context, desc);
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}
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else {
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*fun.second = reinterpret_cast<void*>(addr);
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}
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}
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jitFinalizer.finalze();
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}
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} // anon namespace
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extern "C" {
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#ifdef _WIN32
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__declspec(dllexport)
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#endif
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void rtCompileProcessImplSo(const void* modlist_head,
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const Context* context,
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size_t contextSize) {
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assert(nullptr != context);
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assert(sizeof(*context) == contextSize);
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rtCompileProcessImplSoInternal(
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static_cast<const RtComileModuleList*>(modlist_head),
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*context);
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}
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}
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