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//===--- Builtins.cpp - Builtin function implementation -------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file 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/Basic/Builtins.h"
#include "clang/Basic/IdentifierTable.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Basic/TargetInfo.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
using namespace clang;
static const Builtin::Info BuiltinInfo[] = {
{ "not a builtin function", 0, 0, 0, ALL_LANGUAGES },
#define BUILTIN(ID, TYPE, ATTRS) { #ID, TYPE, ATTRS, 0, ALL_LANGUAGES },
#define LANGBUILTIN(ID, TYPE, ATTRS, BUILTIN_LANG) { #ID, TYPE, ATTRS, 0, BUILTIN_LANG },
#define LIBBUILTIN(ID, TYPE, ATTRS, HEADER, BUILTIN_LANG) { #ID, TYPE, ATTRS, HEADER,\
BUILTIN_LANG },
#include "clang/Basic/Builtins.def"
};
const Builtin::Info &Builtin::Context::GetRecord(unsigned ID) const {
if (ID < Builtin::FirstTSBuiltin)
return BuiltinInfo[ID];
assert(ID - Builtin::FirstTSBuiltin < NumTSRecords && "Invalid builtin ID!");
return TSRecords[ID - Builtin::FirstTSBuiltin];
}
Builtin::Context::Context() {
// Get the target specific builtins from the target.
TSRecords = 0;
NumTSRecords = 0;
}
void Builtin::Context::InitializeTarget(const TargetInfo &Target) {
assert(NumTSRecords == 0 && "Already initialized target?");
Target.getTargetBuiltins(TSRecords, NumTSRecords);
}
bool Builtin::Context::BuiltinIsSupported(const Builtin::Info &BuiltinInfo,
const LangOptions &LangOpts) {
bool BuiltinsUnsupported = LangOpts.NoBuiltin &&
strchr(BuiltinInfo.Attributes, 'f');
bool MathBuiltinsUnsupported =
LangOpts.NoMathBuiltin && BuiltinInfo.HeaderName &&
llvm::StringRef(BuiltinInfo.HeaderName).equals("math.h");
bool GnuModeUnsupported = !LangOpts.GNUMode &&
(BuiltinInfo.builtin_lang & GNU_LANG);
bool MSModeUnsupported = !LangOpts.MicrosoftExt &&
(BuiltinInfo.builtin_lang & MS_LANG);
bool ObjCUnsupported = !LangOpts.ObjC1 &&
BuiltinInfo.builtin_lang == OBJC_LANG;
return !BuiltinsUnsupported && !MathBuiltinsUnsupported &&
!GnuModeUnsupported && !MSModeUnsupported && !ObjCUnsupported;
}
/// InitializeBuiltins - Mark the identifiers for all the builtins with their
/// appropriate builtin ID # and mark any non-portable builtin identifiers as
/// such.
void Builtin::Context::InitializeBuiltins(IdentifierTable &Table,
const LangOptions& LangOpts) {
// Step #1: mark all target-independent builtins with their ID's.
for (unsigned i = Builtin::NotBuiltin+1; i != Builtin::FirstTSBuiltin; ++i)
if (BuiltinIsSupported(BuiltinInfo[i], LangOpts)) {
Table.get(BuiltinInfo[i].Name).setBuiltinID(i);
}
// Step #2: Register target-specific builtins.
for (unsigned i = 0, e = NumTSRecords; i != e; ++i)
if (!LangOpts.NoBuiltin || !strchr(TSRecords[i].Attributes, 'f'))
Table.get(TSRecords[i].Name).setBuiltinID(i+Builtin::FirstTSBuiltin);
}
void
Builtin::Context::GetBuiltinNames(SmallVectorImpl<const char *> &Names) {
// Final all target-independent names
for (unsigned i = Builtin::NotBuiltin+1; i != Builtin::FirstTSBuiltin; ++i)
if (!strchr(BuiltinInfo[i].Attributes, 'f'))
Names.push_back(BuiltinInfo[i].Name);
// Find target-specific names.
for (unsigned i = 0, e = NumTSRecords; i != e; ++i)
if (!strchr(TSRecords[i].Attributes, 'f'))
Names.push_back(TSRecords[i].Name);
}
void Builtin::Context::ForgetBuiltin(unsigned ID, IdentifierTable &Table) {
Table.get(GetRecord(ID).Name).setBuiltinID(0);
}
bool
Builtin::Context::isPrintfLike(unsigned ID, unsigned &FormatIdx,
bool &HasVAListArg) {
const char *Printf = strpbrk(GetRecord(ID).Attributes, "pP");
if (!Printf)
return false;
HasVAListArg = (*Printf == 'P');
++Printf;
assert(*Printf == ':' && "p or P specifier must have be followed by a ':'");
++Printf;
assert(strchr(Printf, ':') && "printf specifier must end with a ':'");
FormatIdx = strtol(Printf, 0, 10);
return true;
}
// FIXME: Refactor with isPrintfLike.
bool
Builtin::Context::isScanfLike(unsigned ID, unsigned &FormatIdx,
bool &HasVAListArg) {
const char *Scanf = strpbrk(GetRecord(ID).Attributes, "sS");
if (!Scanf)
return false;
HasVAListArg = (*Scanf == 'S');
++Scanf;
assert(*Scanf == ':' && "s or S specifier must have be followed by a ':'");
++Scanf;
assert(strchr(Scanf, ':') && "printf specifier must end with a ':'");
FormatIdx = strtol(Scanf, 0, 10);
return true;
}
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