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ExternLayer.cpp
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Fri, Mar 13, 8:06 PM
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Sun, Mar 15, 8:06 PM (1 d, 12 h)
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rXR Xreate
ExternLayer.cpp
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//
// Created by pgess on 4/21/15.
//
#include "ExternLayer.h"
#include <cstdio>
#include <iostream>
#include "clang/Tooling/Tooling.h"
#include "clang/Frontend/ASTUnit.h"
#include "clang/Frontend/CodeGenOptions.h"
#include "clang/ASTMatchers/ASTMatchers.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Basic/TargetInfo.h"
#include <llvm/Support/DynamicLibrary.h>
#include <boost/format.hpp>
#include <boost/algorithm/string/join.hpp>
using namespace xreate;
using namespace std;
using namespace clang;
using namespace clang::driver;
using namespace clang::tooling;
using namespace clang::ast_matchers;
using namespace llvm;
class FinderCallbackTypeDecl : public MatchFinder::MatchCallback {
public :
QualType typeResult;
virtual void run(const MatchFinder::MatchResult &Result) {
if (const TypedefDecl* decl = Result.Nodes.getNodeAs<clang::TypedefDecl>("typename")) {
typeResult = decl->getUnderlyingType();
}
}
};
class FinderCallbackFunction : public MatchFinder::MatchCallback {
public :
QualType typeResult;
virtual void run(const MatchFinder::MatchResult &Result) {
if (const FunctionDecl* decl = Result.Nodes.getNodeAs<clang::FunctionDecl>("function")) {
typeResult = decl->getType();
}
}
};
void
ExternData::addLibrary(Atom<Identifier_t>&& name, Atom<String_t>&& package)
{
__dictLibraries.emplace(name.get(), package.get());
}
void
ExternData::addIncludeDecl(Expression&& e)
{
assert(e.op == Operator::LIST_NAMED);
//TODO ?? implement Expression parsing(Array of Expr as vector<string>);
for(size_t i=0, size=e.operands.size(); i<size; ++i)
{
std::string library = e.bindings.at(i);
assert(__dictLibraries.count(library));
std::string package = __dictLibraries.at(library);
Expression listHeaders = e.operands.at(i);
assert(listHeaders.op == Operator::LIST);
std::vector<std::string> headers;
std::transform(listHeaders.operands.begin(), listHeaders.operands.end(), std::inserter(headers, headers.end()),
[](const Expression& o){
assert(o.__state == Expression::STRING);
return o.getValueString();
});
entries.emplace_back(ExternEntry{package, std::move(headers)});
}
}
void
ExternLayer::addExternalData(const std::vector<ExternEntry>& data){
entries.insert(entries.end(), data.begin(), data.end());
}
ExternLayer::ExternLayer(LLVMLayer *llvm)
: __datalayout(llvm->module), __llvm(llvm)
{}
std::vector<string>
ExternLayer::fetchPackageFlags(const ExternEntry& entry){
std::vector<string> args;
FILE* flags = popen((string("pkg-config --cflags ") + entry.package).c_str(), "r");
size_t linesize=0;
char* linebuf=0;
ssize_t linelen=0;
while ((linelen=getdelim(&linebuf, &linesize, ' ', flags))>0) {
if (linebuf[0]=='\n') continue;
if (linelen==1 && linebuf[0]==' ') continue;
if (linebuf[linelen-1 ] == ' ')
linebuf[linelen-1] = 0;
llvm::outs() << '<' << linebuf << "> ";
args.push_back(linebuf);
free(linebuf);
linebuf = 0;
}
pclose(flags);
return (args);
}
std::vector<string>
ExternLayer::fetchPackageLibs(const ExternEntry& entry){
std::vector<string> libs;
FILE* flags = popen((string("pkg-config --libs ") + entry.package).c_str(), "r");
size_t linesize=0;
char* linebuf=0;
ssize_t linelen=0;
while ((linelen=getdelim(&linebuf, &linesize, ' ', flags))>0) {
if (linebuf[0]=='\n') continue;
if (linelen==1 && linebuf[0]==' ') continue;
if (linebuf[linelen-1 ] == ' ')
linebuf[linelen-1] = 0;
if (linelen>=2 && linebuf[0] == '-' && linebuf[1] == 'l'){
libs.push_back(linebuf + 2);
} else {
libs.push_back(linebuf);
}
llvm::outs() << '<' << linebuf << "> ";
free(linebuf);
linebuf = 0;
}
pclose(flags);
return (libs);
}
void
ExternLayer::loadLibraries(vector<string>&& libs){
string msgErr;
for (const string& lib: libs) {
const string& libName = string("lib")+lib+".so";
if (!llvm::sys::DynamicLibrary::LoadLibraryPermanently(libName.c_str(), &msgErr)){
llvm::errs()<<"\n"<<"Loading library "<<lib<<". " <<msgErr<<"\n";
}
}
}
void
ExternLayer::init(const AST* root) {
addExternalData(root->__externdata);
// TODO use default include path from 'clang -xc++ -E'
list<string> code;
std::vector<string> args{
"-I/usr/include"
,"-I/usr/local/include"
,"-I/usr/lib/llvm-3.6/lib/clang/3.6.2/include"
// ,"-I/usr/lib/gcc/x86_64-linux-gnu/4.9/include"
// ,"-I/usr/include/x86_64-linux-gnu"
};
std::vector<string> libs;
boost::format formatInclude("#include \"%1%\"");
for(const ExternEntry& entry: entries)
{
llvm::outs()<<"[ExternC] Processing package: "<< entry.package << "\n";
llvm::outs()<<"[ExternC] args: ";
vector<string>&& args2 = fetchPackageFlags(entry);
args.insert(args.end(), args2.begin(), args2.end());
for(const string arg: args2) {
llvm::outs()<< "<" << arg << "> ";
}
llvm::outs()<<"\n[ExternC] libs: ";
args2 = fetchPackageLibs(entry);
for(const string arg: args2) {
llvm::outs()<< "<" << arg << "> ";
}
libs.insert(libs.end(), args2.begin(), args2.end());
llvm::outs()<<"\n[ExternC] headers: ";
std::transform(entry.headers.begin(), entry.headers.end(), std::inserter(code, code.begin()),
[&formatInclude](const string header ) {
string line = boost::str(formatInclude % header);
llvm::outs()<< "<" << line << "> ";
return line;
});
llvm::outs() << '\n';
}
loadLibraries(move(libs));
ast = buildASTFromCodeWithArgs(boost::algorithm::join(code, "\n"), args);
__cgo.reset(new CodeGenOptions);
__datalayout = llvm::DataLayout(ast->getASTContext().getTargetInfo().getTargetDescription());
__cgm.reset(new CodeGen::CodeGenModule(ast->getASTContext(), *__cgo, *__llvm->module, __datalayout, ast->getASTContext().getDiagnostics()));
};
bool
ExternLayer::isPointer(const clang::QualType &t) {
const clang::Type * tInfo = t.getTypePtr();
assert(tInfo);
return tInfo->isAnyPointerType();
}
llvm::Type*
ExternLayer::toLLVMType(const clang::QualType& t){
return __cgm->getTypes().ConvertType(t);
}
std::vector<std::string>
ExternLayer::getStructFields(const clang::QualType& ty)
{
clang::QualType t = ty;
if (isPointer(ty)){
const clang::PointerType* tPtr = ty->getAs<clang::PointerType>();
t = tPtr->getPointeeType();
}
assert(t.getTypePtr()->isRecordType());
const RecordType *record = t->getAsStructureType();
assert(record);
std::vector<std::string> result;
//FieldDecl* field: record->getDecl()->fields()
for (auto i=record->getDecl()->field_begin(); i!= record->getDecl()->field_end(); ++i){
result.push_back(i->getName());
}
return result;
}
clang::QualType
ExternLayer::lookupType(const std::string& id){
MatchFinder finder;
FinderCallbackTypeDecl callbackTypeDecl;
auto matcherTypeDecl = typedefDecl(hasName(id)).bind("typename");
finder.addMatcher(matcherTypeDecl, &callbackTypeDecl);
finder.matchAST(ast->getASTContext());
assert(! callbackTypeDecl.typeResult.isNull());
return callbackTypeDecl.typeResult;
}
llvm::Function*
ExternLayer::lookupFunction(const std::string& name){
if (__functions.count(name)){
return __functions.at(name);
}
MatchFinder finder;
FinderCallbackFunction callback;
auto matcher = functionDecl(hasName(name)).bind("function");
finder.addMatcher(matcher, &callback);
finder.matchAST(ast->getASTContext());
if (callback.typeResult.isNull()){
cout <<"[External Layer] " << "Unknown function: "<<name << endl;
assert(false && "Unknown external function");
}
const QualType& tyFuncQual = callback.typeResult;
llvm::Type *tyRaw = __cgm->getTypes().ConvertType(tyFuncQual);
llvm::FunctionType* tyRawFunc = llvm::dyn_cast<llvm::FunctionType>(tyRaw);
llvm::Function* function = llvm::Function::Create(tyRawFunc, llvm::GlobalValue::ExternalLinkage, name, __llvm->module);
__functions.emplace(name, function);
return function;
}
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