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//===--- Builtins.cpp - Builtin function implementation -------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements various things for builtin functions.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/Builtins.h"
#include "clang/AST/ASTContext.h"
#include "clang/Lex/IdentifierTable.h"
using namespace llvm;
using namespace clang;
static const Builtin::Info BuiltinInfo[] = {
{ "not a builtin function", 0, 0 },
#define BUILTIN(ID, TYPE, ATTRS) { #ID, TYPE, ATTRS },
#include "clang/AST/Builtins.def"
};
/// Builtin::GetName - Return the identifier name for the specified builtin,
/// e.g. "__builtin_abs".
const char *Builtin::GetName(ID id) {
if (id >= Builtin::FirstTargetSpecificBuiltin)
return "target-builtin";
return BuiltinInfo[id].Name;
}
/// InitializeBuiltins - Mark the identifiers for all the builtins with their
/// appropriate builtin ID # and mark any non-portable builtin identifiers as
/// such.
void Builtin::InitializeBuiltins(IdentifierTable &Table,
const TargetInfo &Target) {
// Step #1: mark all target-independent builtins with their ID's.
for (unsigned i = Builtin::NotBuiltin+1;
i != Builtin::FirstTargetSpecificBuiltin; ++i)
Table.get(BuiltinInfo[i].Name).setBuiltinID(i);
// Step #2: handle target builtins.
// FIXME: implement.
}
/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the
/// pointer over the consumed characters. This returns the resultant type.
static TypeRef DecodeTypeFromStr(const char *&Str, ASTContext &Context) {
// Modifiers.
bool Long = false, LongLong = false, Signed = false, Unsigned = false;
// Read the modifiers first.
bool Done = false;
while (!Done) {
switch (*Str++) {
default: Done = true; --Str; break;
case 'S':
assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!");
assert(!Signed && "Can't use 'S' modifier multiple times!");
Signed = true;
break;
case 'U':
assert(!Signed && "Can't use both 'S' and 'U' modifiers!");
assert(!Unsigned && "Can't use 'S' modifier multiple times!");
Unsigned = true;
break;
case 'L':
assert(!LongLong && "Can't have LLL modifier");
if (Long)
LongLong = true;
else
Long = true;
break;
}
}
// Read the base type.
switch (*Str++) {
default: assert(0 && "Unknown builtin type letter!");
case 'f':
assert(!Long && !Signed && !Unsigned && "Bad modifiers used with 'f'!");
return Context.FloatTy;
case 'd':
assert(!LongLong && !Signed && !Unsigned && "Bad modifiers used with 'd'!");
if (Long)
return Context.LongDoubleTy;
return Context.DoubleTy;
//case 'i':
}
}
/// GetBuiltinType - Return the type for the specified builtin.
TypeRef Builtin::GetBuiltinType(ID id, ASTContext &Context) {
assert(id < Builtin::FirstTargetSpecificBuiltin &&
"Can't handle target builtins yet!");
const char *TypeStr = BuiltinInfo[id].Type;
SmallVector<TypeRef, 8> ArgTypes;
TypeRef ResType = DecodeTypeFromStr(TypeStr, Context);
while (TypeStr[0] && TypeStr[0] != '.')
ArgTypes.push_back(DecodeTypeFromStr(TypeStr, Context));
assert((TypeStr[0] != '.' || TypeStr[1] == 0) &&
"'.' should only occur at end of builtin type list!");
return Context.getFunctionType(ResType, &ArgTypes[0], ArgTypes.size(),
TypeStr[0] == '.');
}