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lang_1-llvm.cxx
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lang_1-llvm.cxx
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// (C) Bernard Hugueney, licence GPL v3
#include <string>
#include <iostream>
#include <boost/lexical_cast.hpp>
#include <boost/spirit/include/qi.hpp>
#include <boost/spirit/include/phoenix_operator.hpp>
#include <boost/spirit/include/phoenix_function.hpp>
#include <llvm/LLVMContext.h>
#include <llvm/Module.h>
#include <llvm/Function.h>
#include <llvm/PassManager.h>
#include <llvm/Analysis/Verifier.h>
#include <llvm/Assembly/PrintModulePass.h>
#include <llvm/Support/IRBuilder.h>
#include <llvm/Support/raw_ostream.h>
#include <llvm/DerivedTypes.h>
#include <llvm/ExecutionEngine/ExecutionEngine.h>
#include <llvm/Target/TargetData.h>
#include <llvm/Target/TargetSelect.h>
#include <llvm/Transforms/Scalar.h>
#include <llvm/ExecutionEngine/JIT.h>
// see http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20101115/112020.html
#include <llvm/Support/NoFolder.h>
using namespace llvm;
// g++ -o lang_1-llvm lang_1-llvm.cxx `llvm-config-2.8 --cppflags --ldflags --libs ` -lstdc++ -rdynamic
using namespace boost::spirit;
using namespace boost::spirit::qi;
using namespace boost::spirit::ascii;
// template function to map C++ type -> llvm::Type
template<typename T> static const llvm::Type* type(){ return "unkown type!";}// error
#define MAP_INT_TYPE(cpp_type_) \
template <> \
const llvm::Type* type<cpp_type_>() { \
return llvm::Type::getIntNTy(llvm::getGlobalContext() \
, sizeof(cpp_type_)*8); \
}
#define MAP_TYPE(cpp_type_, fn_) \
template <> \
const llvm::Type* type<cpp_type_>() { \
return llvm::Type::fn_(llvm::getGlobalContext()); \
}
MAP_TYPE(void, getVoidTy)
MAP_INT_TYPE(char)
MAP_INT_TYPE(short)
MAP_INT_TYPE(int)
MAP_INT_TYPE(long)
MAP_INT_TYPE(long long)
MAP_TYPE(float, getFloatTy)
MAP_TYPE(double, getDoubleTy)
// long double is more tricky
#undef MAP_INT_TYPE
#undef MAP_TYPE
// arithmetic expression grammar, using actions to insert nodes into the AST
template <typename value_t, typename Iterator, typename Builder>
struct language_1_grammar : grammar<Iterator, Module*(), boost::spirit::standard::space_type> {
struct builder_helper{
template<typename T1, typename T2=T1, typename T3=T2, typename T4=T3> struct result{ typedef Value* type;};
builder_helper(Builder& b):builder(b){}
typedef Value* (Builder::*binary_op_t)(Value*, Value*, const Twine&);
typedef Value* (Builder::*unary_op_t)(Value*, const Twine&);
typedef ReturnInst* (Builder::*op_no_name )(Value*);
Value* operator()(binary_op_t op, Value* a1, Value* a2, const char * name) const
{ return (builder.*op)(a1, a2, name); }
Value* operator()(unary_op_t op, Value* a, const char * name) const
{ return (builder.*op)(a, name); }
Value* operator()(op_no_name op, Value* const& a) const
{ return (builder.*op)(a); }
Value* operator()(short v) const { return ConstantInt::get(getGlobalContext(), APInt(sizeof(short)*8, v)); }
Value* operator()(int v) const { return ConstantInt::get(getGlobalContext(), APInt(sizeof(int)*8, v)); }
Value* operator()(long v) const { return ConstantInt::get(getGlobalContext(), APInt(sizeof(long)*8, v)); }
Value* operator()(float v) const { return ConstantFP::get(getGlobalContext(), APFloat(v)); }
Value* operator()(double v)const{ return ConstantFP::get(getGlobalContext(), APFloat(v)); }
Builder& builder;
};
language_1_grammar(char const * const name)
: language_1_grammar::base_type(module),
module_ptr(new Module(name, getGlobalContext()))
, build(*(new Builder(BasicBlock::Create(getGlobalContext(),"entry",
cast<Function>(module_ptr->getOrInsertFunction("main", type<value_t>(), NULL))))))
{
module = program[_val=module_ptr];
program = additive_expression [_val=build(&Builder::CreateRet,_1)]
;
additive_expression =
multiplicative_expression [_val=_1]
>> *(
('+' >> multiplicative_expression
[_val= build(&Builder::CreateAdd, _val, _1,"addtmp")])
|('-' >> multiplicative_expression
[_val=build(&Builder::CreateSub, _val, _1,"subtmp")])
)
;
multiplicative_expression =
factor [_val=_1]
>> *(
('*' >> factor[_val= build(&Builder::CreateMul, _val, _1, "multmp")])
|('/' >> factor [_val = build(&Builder::CreateSDiv, _val, _1, "divtmp")])
)
;
factor =
numeric_to_val [_val=_1]
| '(' >> additive_expression [_val=_1] >> ')'
| ('-' >> factor
[_val= build(&Builder::CreateNeg, _1,"negtmp")]
)
| ('+' >> factor [_val=_1])
;
numeric_to_val = boost::spirit::traits::create_parser<value_t>::call()[_val=build(_1)];
}
rule<Iterator, Value*(), boost::spirit::standard::space_type> additive_expression, multiplicative_expression
, factor, numeric_to_val, program;
rule<Iterator, Module*(), boost::spirit::standard::space_type> module;
Module* module_ptr;
boost::phoenix::function<builder_helper> build;
};
int main(int argc, char* argv[]){
typedef int value_t; // value used in arithmetic computations
if(argc > 2 )
{ std::cerr<< "Usage: "<<argv[0]<<" [nb of executions]\n"; return 1;}
std::cin.unsetf(std::ios::skipws); // Turn off white space skipping on the stream
typedef std::string buffer_t;
buffer_t buffer(std::istream_iterator<char>(std::cin), (std::istream_iterator<char>()));
typedef buffer_t::const_iterator iter_t;
iter_t iter(buffer.begin()), end(buffer.end());
typedef language_1_grammar<value_t, iter_t, llvm::IRBuilder<true, NoFolder> > grammar_t;
Module* module_ptr(0);
grammar_t grammar("lang_1");
bool r = phrase_parse(iter, end, grammar, boost::spirit::standard::space, module_ptr);
if (r && iter == end) {
std::cout<<"parsing succeded !\n";
verifyModule(*module_ptr, PrintMessageAction);
module_ptr->dump();
llvm::InitializeNativeTarget();
std::string ErrStr;
llvm::ExecutionEngine* exec_engine_ptr= llvm::EngineBuilder(module_ptr).setErrorStr(&ErrStr).create();
if (!exec_engine_ptr) {
std::cerr<<"Could not create ExecutionEngine:"<< ErrStr.c_str()<<std::endl;
}else {
typedef value_t (*fun_ptr_t)(void);
fun_ptr_t fun_ptr =
reinterpret_cast<fun_ptr_t>(exec_engine_ptr->getPointerToFunction(module_ptr->getFunction("main")));
std::cout<<"result: "<<(*fun_ptr)()<<std::endl;
}
} else {
std::string rest(iter, end);
std::cerr << "parsing failed\n" << "stopped at: \"" << rest << "\"\n";
}
delete module_ptr;
return r ? 0 : 1 ;
}