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| //===--- Builtins.cpp - Builtin function implementation -------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// 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,nullptr},
#define BUILTIN(ID, TYPE, ATTRS) \
{ #ID, TYPE, ATTRS, nullptr, ALL_LANGUAGES, nullptr },
#define LANGBUILTIN(ID, TYPE, ATTRS, LANGS) \
{ #ID, TYPE, ATTRS, nullptr, LANGS, nullptr },
#define LIBBUILTIN(ID, TYPE, ATTRS, HEADER, LANGS) \
{ #ID, TYPE, ATTRS, HEADER, LANGS, nullptr },
#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) <
(TSRecords.size() + AuxTSRecords.size())) &&
"Invalid builtin ID!");
if (isAuxBuiltinID(ID))
return AuxTSRecords[getAuxBuiltinID(ID) - Builtin::FirstTSBuiltin];
return TSRecords[ID - Builtin::FirstTSBuiltin];
}
void Builtin::Context::InitializeTarget(const TargetInfo &Target,
const TargetInfo *AuxTarget) {
assert(TSRecords.empty() && "Already initialized target?");
TSRecords = Target.getTargetBuiltins();
if (AuxTarget)
AuxTSRecords = AuxTarget->getTargetBuiltins();
}
bool Builtin::Context::isBuiltinFunc(const char *Name) {
StringRef FuncName(Name);
for (unsigned i = Builtin::NotBuiltin + 1; i != Builtin::FirstTSBuiltin; ++i)
if (FuncName.equals(BuiltinInfo[i].Name))
return strchr(BuiltinInfo[i].Attributes, 'f') != nullptr;
return false;
}
bool Builtin::Context::builtinIsSupported(const Builtin::Info &BuiltinInfo,
const LangOptions &LangOpts) {
bool BuiltinsUnsupported =
(LangOpts.NoBuiltin || LangOpts.isNoBuiltinFunc(BuiltinInfo.Name)) &&
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.ObjC && BuiltinInfo.Langs == OBJC_LANG;
bool OclC1Unsupported = (LangOpts.OpenCLVersion / 100) != 1 &&
(BuiltinInfo.Langs & ALL_OCLC_LANGUAGES ) == OCLC1X_LANG;
bool OclC2Unsupported =
(LangOpts.OpenCLVersion != 200 && !LangOpts.OpenCLCPlusPlus) &&
(BuiltinInfo.Langs & ALL_OCLC_LANGUAGES) == OCLC20_LANG;
bool OclCUnsupported = !LangOpts.OpenCL &&
(BuiltinInfo.Langs & ALL_OCLC_LANGUAGES);
bool OpenMPUnsupported = !LangOpts.OpenMP && BuiltinInfo.Langs == OMP_LANG;
bool CPlusPlusUnsupported =
!LangOpts.CPlusPlus && BuiltinInfo.Langs == CXX_LANG;
return !BuiltinsUnsupported && !MathBuiltinsUnsupported && !OclCUnsupported &&
!OclC1Unsupported && !OclC2Unsupported && !OpenMPUnsupported &&
!GnuModeUnsupported && !MSModeUnsupported && !ObjCUnsupported &&
!CPlusPlusUnsupported;
}
/// 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 = TSRecords.size(); i != e; ++i)
if (builtinIsSupported(TSRecords[i], LangOpts))
Table.get(TSRecords[i].Name).setBuiltinID(i + Builtin::FirstTSBuiltin);
// Step #3: Register target-specific builtins for AuxTarget.
for (unsigned i = 0, e = AuxTSRecords.size(); i != e; ++i)
Table.get(AuxTSRecords[i].Name)
.setBuiltinID(i + Builtin::FirstTSBuiltin + TSRecords.size());
}
void Builtin::Context::forgetBuiltin(unsigned ID, IdentifierTable &Table) {
Table.get(getRecord(ID).Name).setBuiltinID(0);
}
unsigned Builtin::Context::getRequiredVectorWidth(unsigned ID) const {
const char *WidthPos = ::strchr(getRecord(ID).Attributes, 'V');
if (!WidthPos)
return 0;
++WidthPos;
assert(*WidthPos == ':' &&
"Vector width specifier must be followed by a ':'");
++WidthPos;
char *EndPos;
unsigned Width = ::strtol(WidthPos, &EndPos, 10);
assert(*EndPos == ':' && "Vector width specific must end with a ':'");
return Width;
}
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");
}
bool Builtin::Context::performsCallback(unsigned ID,
SmallVectorImpl<int> &Encoding) const {
const char *CalleePos = ::strchr(getRecord(ID).Attributes, 'C');
if (!CalleePos)
return false;
++CalleePos;
assert(*CalleePos == '<' &&
"Callback callee specifier must be followed by a '<'");
++CalleePos;
char *EndPos;
int CalleeIdx = ::strtol(CalleePos, &EndPos, 10);
assert(CalleeIdx >= 0 && "Callee index is supposed to be positive!");
Encoding.push_back(CalleeIdx);
while (*EndPos == ',') {
const char *PayloadPos = EndPos + 1;
int PayloadIdx = ::strtol(PayloadPos, &EndPos, 10);
Encoding.push_back(PayloadIdx);
}
assert(*EndPos == '>' && "Callback callee specifier must end with a '>'");
return true;
}
bool Builtin::Context::canBeRedeclared(unsigned ID) const {
return ID == Builtin::NotBuiltin ||
ID == Builtin::BI__va_start ||
(!hasReferenceArgsOrResult(ID) &&
!hasCustomTypechecking(ID));
}
|