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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/StringRef.h"
using namespace clang;
static const Builtin::Info BuiltinInfo[] = {
{ "not a builtin function", nullptr, nullptr, nullptr, ALL_LANGUAGES},
#define BUILTIN(ID, TYPE, ATTRS) { #ID, TYPE, ATTRS, 0, ALL_LANGUAGES },
#define LANGBUILTIN(ID, TYPE, ATTRS, LANGS) \
{ #ID, TYPE, ATTRS, 0, LANGS } \
,
#define LIBBUILTIN(ID, TYPE, ATTRS, HEADER, LANGS) \
{ #ID, TYPE, ATTRS, HEADER, LANGS } \
,
#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 = nullptr;
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.Langs & GNU_LANG);
bool MSModeUnsupported =
!LangOpts.MicrosoftExt && (BuiltinInfo.Langs & MS_LANG);
bool ObjCUnsupported = !LangOpts.ObjC1 && BuiltinInfo.Langs == 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 (BuiltinIsSupported(TSRecords[i], LangOpts))
Table.get(TSRecords[i].Name).setBuiltinID(i+Builtin::FirstTSBuiltin);
}
void Builtin::Context::ForgetBuiltin(unsigned ID, IdentifierTable &Table) {
Table.get(GetRecord(ID).Name).setBuiltinID(0);
}
bool Builtin::Context::isLike(unsigned ID, unsigned &FormatIdx,
bool &HasVAListArg, const char *Fmt) const {
assert(Fmt && "Not passed a format string");
assert(::strlen(Fmt) == 2 &&
"Format string needs to be two characters long");
assert(::toupper(Fmt[0]) == Fmt[1] &&
"Format string is not in the form \"xX\"");
const char *Like = ::strpbrk(GetRecord(ID).Attributes, Fmt);
if (!Like)
return false;
HasVAListArg = (*Like == Fmt[1]);
++Like;
assert(*Like == ':' && "Format specifier must be followed by a ':'");
++Like;
assert(::strchr(Like, ':') && "Format specifier must end with a ':'");
FormatIdx = ::strtol(Like, nullptr, 10);
return true;
}
bool Builtin::Context::isPrintfLike(unsigned ID, unsigned &FormatIdx,
bool &HasVAListArg) {
return isLike(ID, FormatIdx, HasVAListArg, "pP");
}
bool Builtin::Context::isScanfLike(unsigned ID, unsigned &FormatIdx,
bool &HasVAListArg) {
return isLike(ID, FormatIdx, HasVAListArg, "sS");
}
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