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//===-- gen_gccbuiltins.cpp - GCC builtin module generator ----------------===//
//
// LDC – the LLVM D compiler
//
// This file is distributed under the BSD-style LDC license. See the LICENSE
// file for details.
//
//===----------------------------------------------------------------------===//
//
// This tool reads the GCC builtin definitions from LLVM's Intrinsics.td for
// a given architecture and accordingly generates a ldc.gccbuiltins_<arch>
// module for using them from D code.
//
//===----------------------------------------------------------------------===//
#include "llvm/TableGen/Main.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Path.h"
#include "llvm/TableGen/Record.h"
#include <algorithm>
#include <assert.h>
#include <map>
#include <stdio.h>
#include <string.h>
#include <string>
using namespace std;
using namespace llvm;
string dtype(Record* rec, bool readOnlyMem)
{
Init* typeInit = rec->getValueInit("VT");
if(!typeInit)
return "";
string type = typeInit->getAsString();
if(type == "iPTR")
return readOnlyMem ? "const void*" : "void*";
string vec = "";
if(type[0] == 'v')
{
size_t i = 1;
while(i != type.size() && type[i] <= '9' && type[i] >= '0')
i++;
vec = type.substr(1, i - 1);
type = type.substr(i);
}
if(type == "i1" && vec.empty())
return "bool";
else if(type == "i8")
return "byte" + vec;
else if(type == "i16")
return "short" + vec;
else if(type == "i32")
return "int" + vec;
else if(type == "i64")
return "long" + vec;
else if(type == "f32")
return "float" + vec;
else if(type == "f64")
return "double" + vec;
else
return "";
}
StringRef attributes(ListInit* propertyList)
{
const auto prop = propertyList->size()
? propertyList->getElementAsRecord(0)->getName()
: "";
if (prop == "IntrNoMem")
return " pure @safe";
if (prop == "IntrReadArgMem" || prop == "IntrReadWriteArgMem")
return " pure";
return "";
}
void processRecord(raw_ostream& os, Record& rec, string arch)
{
if(!rec.getValue("GCCBuiltinName"))
return;
const StringRef builtinName = rec.getValueAsString("GCCBuiltinName");
string name = rec.getName().str();
if(name.substr(0, 4) != "int_" || name.find(arch) == string::npos)
return;
name = name.substr(4);
replace(name.begin(), name.end(), '_', '.');
name = string("llvm.") + name;
ListInit* propsList = rec.getValueAsListInit("IntrProperties");
const StringRef prop =
propsList->size() ? propsList->getElementAsRecord(0)->getName() : "";
bool readOnlyMem = prop == "IntrReadArgMem" || prop == "IntrReadMem";
ListInit* paramsList = rec.getValueAsListInit("ParamTypes");
vector<string> params;
for(unsigned int i = 0; i < paramsList->size(); i++)
{
string t = dtype(paramsList->getElementAsRecord(i), readOnlyMem);
if(t == "")
return;
params.push_back(t);
}
ListInit* retList = rec.getValueAsListInit("RetTypes");
string ret;
size_t sz = retList->size();
if(sz == 0)
ret = "void";
else if(sz == 1)
{
ret = dtype(retList->getElementAsRecord(0), false);
if(ret == "")
return;
}
else
return;
os << "pragma(LDC_intrinsic, \"" << name << "\")\n ";
os << ret << " " << builtinName << "(";
if(params.size())
os << params[0];
for(size_t i = 1; i < params.size(); i++)
os << ", " << params[i];
os << ")" << attributes(propsList) << ";\n\n";
}
std::string arch;
bool emit(raw_ostream& os, RecordKeeper& records)
{
os << "module ldc.gccbuiltins_";
os << arch;
os << "; \n\nimport core.simd;\n\nnothrow @nogc:\n\n";
const auto &defs = records.getDefs();
for (const auto& d : defs)
processRecord(os, *d.second, arch);
return false;
}
int main(int argc, char** argv)
{
if(argc != 3)
{
fprintf(stderr, "There must be exactly two command line arguments\n");
return 1;
}
llvm::SmallString<128> file(LLVM_INTRINSIC_TD_PATH);
sys::path::append(file, "llvm");
sys::path::append(file, "IR");
sys::path::append(file, "Intrinsics.td");
string iStr = string("-I=") + LLVM_INTRINSIC_TD_PATH;
string oStr = string("-o=") + argv[1];
vector<char*> args2(argv, argv + 1);
args2.push_back(const_cast<char*>(file.c_str()));
args2.push_back(const_cast<char*>(iStr.c_str()));
args2.push_back(const_cast<char*>(oStr.c_str()));
cl::ParseCommandLineOptions(args2.size(), &args2[0]);
arch = argv[2];
return TableGenMain(argv[0], emit);
}
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