forked from OSchip/llvm-project
124 lines
4.9 KiB
C++
124 lines
4.9 KiB
C++
//===--- Builtins.cpp - Builtin function implementation -------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements various things for builtin functions.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Basic/Builtins.h"
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#include "clang/Basic/IdentifierTable.h"
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#include "clang/Basic/LangOptions.h"
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#include "clang/Basic/TargetInfo.h"
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#include "llvm/ADT/StringRef.h"
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using namespace clang;
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static const Builtin::Info BuiltinInfo[] = {
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{ "not a builtin function", nullptr, nullptr, nullptr, ALL_LANGUAGES,nullptr},
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#define BUILTIN(ID, TYPE, ATTRS) \
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{ #ID, TYPE, ATTRS, nullptr, ALL_LANGUAGES, nullptr },
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#define LANGBUILTIN(ID, TYPE, ATTRS, LANGS) \
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{ #ID, TYPE, ATTRS, nullptr, LANGS, nullptr },
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#define LIBBUILTIN(ID, TYPE, ATTRS, HEADER, LANGS) \
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{ #ID, TYPE, ATTRS, HEADER, LANGS, nullptr },
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#include "clang/Basic/Builtins.def"
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};
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const Builtin::Info &Builtin::Context::getRecord(unsigned ID) const {
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if (ID < Builtin::FirstTSBuiltin)
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return BuiltinInfo[ID];
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assert(((ID - Builtin::FirstTSBuiltin) <
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(TSRecords.size() + AuxTSRecords.size())) &&
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"Invalid builtin ID!");
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if (isAuxBuiltinID(ID))
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return AuxTSRecords[getAuxBuiltinID(ID) - Builtin::FirstTSBuiltin];
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return TSRecords[ID - Builtin::FirstTSBuiltin];
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}
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void Builtin::Context::InitializeTarget(const TargetInfo &Target,
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const TargetInfo *AuxTarget) {
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assert(TSRecords.empty() && "Already initialized target?");
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TSRecords = Target.getTargetBuiltins();
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if (AuxTarget)
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AuxTSRecords = AuxTarget->getTargetBuiltins();
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}
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bool Builtin::Context::builtinIsSupported(const Builtin::Info &BuiltinInfo,
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const LangOptions &LangOpts) {
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bool BuiltinsUnsupported = LangOpts.NoBuiltin &&
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strchr(BuiltinInfo.Attributes, 'f');
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bool MathBuiltinsUnsupported =
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LangOpts.NoMathBuiltin && BuiltinInfo.HeaderName &&
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llvm::StringRef(BuiltinInfo.HeaderName).equals("math.h");
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bool GnuModeUnsupported = !LangOpts.GNUMode && (BuiltinInfo.Langs & GNU_LANG);
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bool MSModeUnsupported =
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!LangOpts.MicrosoftExt && (BuiltinInfo.Langs & MS_LANG);
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bool ObjCUnsupported = !LangOpts.ObjC1 && BuiltinInfo.Langs == OBJC_LANG;
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return !BuiltinsUnsupported && !MathBuiltinsUnsupported &&
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!GnuModeUnsupported && !MSModeUnsupported && !ObjCUnsupported;
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}
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/// initializeBuiltins - Mark the identifiers for all the builtins with their
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/// appropriate builtin ID # and mark any non-portable builtin identifiers as
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/// such.
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void Builtin::Context::initializeBuiltins(IdentifierTable &Table,
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const LangOptions& LangOpts) {
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// Step #1: mark all target-independent builtins with their ID's.
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for (unsigned i = Builtin::NotBuiltin+1; i != Builtin::FirstTSBuiltin; ++i)
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if (builtinIsSupported(BuiltinInfo[i], LangOpts)) {
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Table.get(BuiltinInfo[i].Name).setBuiltinID(i);
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}
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// Step #2: Register target-specific builtins.
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for (unsigned i = 0, e = TSRecords.size(); i != e; ++i)
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if (builtinIsSupported(TSRecords[i], LangOpts))
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Table.get(TSRecords[i].Name).setBuiltinID(i + Builtin::FirstTSBuiltin);
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// Step #3: Register target-specific builtins for AuxTarget.
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for (unsigned i = 0, e = AuxTSRecords.size(); i != e; ++i)
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Table.get(AuxTSRecords[i].Name)
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.setBuiltinID(i + Builtin::FirstTSBuiltin + TSRecords.size());
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}
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void Builtin::Context::forgetBuiltin(unsigned ID, IdentifierTable &Table) {
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Table.get(getRecord(ID).Name).setBuiltinID(0);
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}
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bool Builtin::Context::isLike(unsigned ID, unsigned &FormatIdx,
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bool &HasVAListArg, const char *Fmt) const {
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assert(Fmt && "Not passed a format string");
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assert(::strlen(Fmt) == 2 &&
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"Format string needs to be two characters long");
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assert(::toupper(Fmt[0]) == Fmt[1] &&
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"Format string is not in the form \"xX\"");
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const char *Like = ::strpbrk(getRecord(ID).Attributes, Fmt);
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if (!Like)
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return false;
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HasVAListArg = (*Like == Fmt[1]);
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++Like;
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assert(*Like == ':' && "Format specifier must be followed by a ':'");
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++Like;
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assert(::strchr(Like, ':') && "Format specifier must end with a ':'");
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FormatIdx = ::strtol(Like, nullptr, 10);
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return true;
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}
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bool Builtin::Context::isPrintfLike(unsigned ID, unsigned &FormatIdx,
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bool &HasVAListArg) {
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return isLike(ID, FormatIdx, HasVAListArg, "pP");
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}
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bool Builtin::Context::isScanfLike(unsigned ID, unsigned &FormatIdx,
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bool &HasVAListArg) {
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return isLike(ID, FormatIdx, HasVAListArg, "sS");
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}
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