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#include "cps/TypeSystem.h"
#include <utility>
#include <climits>
#include <limits>
#include <type_traits>
#include <sstream>
using namespace llvm;
using namespace cps;
namespace {
std::string cTypeName(const std::string &Identity) {
return "C_TYPE(\"" + Identity + "\")";
}
// sizeof alone cannot distinguish padded x87 from IEEE quad or double-double.
template<typename T> Type *nativeFloatType(LLVMContext &C) {
constexpr int Digits = std::numeric_limits<T>::digits;
constexpr int Exponent = std::numeric_limits<T>::max_exponent;
static_assert(std::numeric_limits<T>::radix == 2, "Unsupported native C floating-point radix");
static_assert((Digits == 24 && Exponent == 128) ||
(Digits == 53 && Exponent == 1024) ||
(Digits == 64 && Exponent == 16384) ||
(Digits == 113 && Exponent == 16384) ||
(Digits == 106 && Exponent == 1024), "Unsupported native C floating-point format");
if constexpr (Digits == 24) return Type::getFloatTy(C);
if constexpr (Digits == 53) return Type::getDoubleTy(C);
if constexpr (Digits == 64) return Type::getX86_FP80Ty(C);
if constexpr (Digits == 113) return Type::getFP128Ty(C);
return Type::getPPC_FP128Ty(C);
}
} // namespace
void TypeSystem::registerBuiltins() {
registerType("INTEGER", Type::getInt64Ty(Context), TypeKind::Integer);
registerType("REAL", Type::getDoubleTy(Context), TypeKind::Real);
registerType("BOOLEAN", Type::getInt1Ty(Context), TypeKind::Boolean);
registerType("CHAR", Type::getInt8Ty(Context), TypeKind::Char);
registerType("VOID", Type::getVoidTy(Context), TypeKind::Void);
// The compiler's native C/C++ ABI determines representation, not a table
// of assumed LP64/LLP64 widths. LLVM's addressable bytes are eight bits.
static_assert(CHAR_BIT == 8, "LLVM requires eight-bit addressable bytes");
auto Integral = [&](auto Sample, const char *Name, unsigned Rank,
const char *OutputFormat) {
using T = decltype(Sample);
TypeInfo Info;
Info.Name = cTypeName(Name);
Info.CIdentity = Name;
Info.Kind = TypeKind::CScalar;
Info.LLVMType = Type::getIntNTy(Context, sizeof(T) * CHAR_BIT);
Info.CRank = Rank;
Info.CSigned = std::is_signed<T>::value;
Info.COutputFormat = OutputFormat;
Types.emplace(Info.Name, std::move(Info));
};
Integral(char{}, "char", 2, "%c");
Integral(static_cast<signed char>(0), "signed char", 2, "%hhd");
Integral(static_cast<unsigned char>(0), "unsigned char", 2, "%hhu");
Integral(short{}, "short", 3, "%hd");
Integral(static_cast<unsigned short>(0), "unsigned short", 3, "%hu");
Integral(int{}, "int", 4, "%d");
Integral(static_cast<unsigned int>(0), "unsigned int", 4, "%u");
Integral(long{}, "long", 5, "%ld");
Integral(static_cast<unsigned long>(0), "unsigned long", 5, "%lu");
Integral(static_cast<long long>(0), "long long", 6, "%lld");
Integral(static_cast<unsigned long long>(0), "unsigned long long", 6, "%llu");
auto Floating = [&](auto Sample, const char *Name, unsigned Rank) {
TypeInfo Info;
Info.Name = cTypeName(Name);
Info.CIdentity = Name;
Info.Kind = TypeKind::CScalar;
Info.LLVMType = nativeFloatType<decltype(Sample)>(Context);
Info.CRank = Rank;
Info.COutputFormat = Rank == 9 ? "%Lf" : "%f";
Types.emplace(Info.Name, std::move(Info));
};
Floating(float{}, "float", 7);
Floating(double{}, "double", 8);
Floating(static_cast<long double>(0), "long double", 9);
TypeInfo Bool;
Bool.Name = cTypeName("_Bool");
Bool.CIdentity = "_Bool";
Bool.Kind = TypeKind::CScalar;
Bool.LLVMType = Type::getInt1Ty(Context);
Bool.CRank = 1;
Types.emplace(Bool.Name, std::move(Bool));
TypeInfo Void;
Void.Name = cTypeName("void");
Void.CIdentity = "void";
Void.Kind = TypeKind::CScalar;
Void.LLVMType = Type::getVoidTy(Context);
Types.emplace(Void.Name, std::move(Void));
std::string Err;
defineCAlias("C_INT", "int", Err);
defineCAlias("C_CHAR", "char", Err);
defineCAlias("C_STRING", "char*", Err);
defineCAlias("C_DOUBLE", "double", Err);
importCType("void*", Err);
}
const TypeInfo *TypeSystem::promoteCScalar(const TypeInfo *Info) const {
if (!Info || Info->Kind != TypeKind::CScalar || Info->isVoid()) return nullptr;
if (Info->CRank >= 4) return Info;
const TypeInfo *Int = resolve(cTypeName("int"));
unsigned Width = Info->LLVMType->getIntegerBitWidth();
unsigned IntWidth = Int->LLVMType->getIntegerBitWidth();
return Width < IntWidth || (Width == IntWidth && Info->CSigned)
? Int : resolve(cTypeName("unsigned int"));
}
const TypeInfo *TypeSystem::commonCScalar(const TypeInfo *Left, const TypeInfo *Right) const {
const TypeInfo *L = promoteCScalar(Left);
const TypeInfo *R = promoteCScalar(Right);
if (!L || !R) return nullptr;
if (L->isReal() || R->isReal() || L->CSigned == R->CSigned)
return L->CRank >= R->CRank ? L : R;
const TypeInfo *S = L->CSigned ? L : R;
const TypeInfo *U = L->CSigned ? R : L;
if (U->CRank >= S->CRank) return U;
if (S->LLVMType->getIntegerBitWidth() > U->LLVMType->getIntegerBitWidth()) return S;
return resolve(cTypeName("unsigned " + S->CIdentity));
}
const TypeInfo *TypeSystem::importCType(const std::string &Expression, std::string &Err) {
// Whitespace is immaterial around stars; C's multiword base type is
// validated separately. Stars must all precede or all follow the base.
std::istringstream Input(Expression);
std::string Word, Text;
while (Input >> Word) {
if (!Text.empty()) Text += ' ';
Text += Word;
}
unsigned Depth = 0;
bool Prefix = !Text.empty() && Text.front() == '*';
if (Prefix) {
while (!Text.empty() && (Text.front() == '*' || Text.front() == ' ')) {
if (Text.front() == '*') ++Depth;
Text.erase(Text.begin());
}
} else {
while (!Text.empty() && (Text.back() == '*' || Text.back() == ' ')) {
if (Text.back() == '*') ++Depth;
Text.pop_back();
}
}
std::istringstream BaseWords(Text);
std::map<std::string, unsigned> Counts;
bool Valid = !Text.empty();
while (BaseWords >> Word) {
if (Word != "signed" && Word != "unsigned" && Word != "short" &&
Word != "long" && Word != "int" && Word != "char" &&
Word != "float" && Word != "double" && Word != "_Bool" && Word != "void")
Valid = false;
++Counts[Word];
}
for (const auto &Entry : Counts)
if (Entry.second > (Entry.first == "long" ? 2u : 1u)) Valid = false;
auto Has = [&](const char *Name) { return Counts.count(Name) != 0; };
if (Has("signed") && Has("unsigned")) Valid = false;
std::string Base;
if (Has("void") || Has("_Bool") || Has("float")) {
if (Counts.size() != 1) Valid = false;
Base = Has("void") ? "void" : Has("_Bool") ? "_Bool" : "float";
} else if (Has("double")) {
if (Counts.size() != (Has("long") ? 2u : 1u) || (Has("long") && Counts["long"] > 1))
Valid = false;
Base = Has("long") ? "long double" : "double";
} else if (Has("char")) {
if (Has("int") || Has("short") || Has("long")) Valid = false;
Base = Has("unsigned") ? "unsigned char" : Has("signed") ? "signed char" : "char";
} else {
if (Has("short") && Has("long")) Valid = false;
Base = Has("short") ? "short" : Has("long") ?
(Counts["long"] == 2 ? "long long" : "long") : "int";
if (Has("unsigned")) Base = "unsigned " + Base;
}
if (!Valid) {
Err = "Invalid or unsupported C type expression '" + Expression + "'";
return nullptr;
}
const TypeInfo *Info = resolve(cTypeName(Base));
for (unsigned I = 0; I < Depth; ++I) {
std::string Identity = Info->CIdentity + '*';
const TypeInfo *Existing = resolve(cTypeName(Identity));
if (Existing) {
Info = Existing;
continue;
}
TypeInfo Pointer;
Pointer.Name = cTypeName(Identity);
Pointer.CIdentity = Identity;
Pointer.Kind = TypeKind::CPointer;
Pointer.LLVMType = PointerType::getUnqual(Context);
Pointer.Pointer.PointeeTypeName = Info->Name;
auto Result = Types.emplace(Pointer.Name, std::move(Pointer));
Info = &Result.first->second;
}
return Info;
}
bool TypeSystem::defineCAlias(const std::string &Name, const std::string &Expression,
std::string &Err) {
if (Types.count(Name) || EnumConstants.count(Name)) {
Err = "Type name '" + Name + "' is already defined or reserved";
return false;
}
const TypeInfo *C = importCType(Expression, Err);
if (!C) return false;
TypeInfo Alias = *C;
Alias.Name = Name;
Types.emplace(Name, std::move(Alias));
return true;
}
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