forked from OSchip/llvm-project
132 lines
5.1 KiB
C++
132 lines
5.1 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/SmallVector.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},
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#define BUILTIN(ID, TYPE, ATTRS) { #ID, TYPE, ATTRS, 0, ALL_LANGUAGES },
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#define LANGBUILTIN(ID, TYPE, ATTRS, BUILTIN_LANG) { #ID, TYPE, ATTRS, 0, BUILTIN_LANG },
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#define LIBBUILTIN(ID, TYPE, ATTRS, HEADER, BUILTIN_LANG) { #ID, TYPE, ATTRS, HEADER,\
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BUILTIN_LANG },
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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 < NumTSRecords && "Invalid builtin ID!");
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return TSRecords[ID - Builtin::FirstTSBuiltin];
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}
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Builtin::Context::Context() {
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// Get the target specific builtins from the target.
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TSRecords = nullptr;
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NumTSRecords = 0;
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}
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void Builtin::Context::InitializeTarget(const TargetInfo &Target) {
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assert(NumTSRecords == 0 && "Already initialized target?");
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Target.getTargetBuiltins(TSRecords, NumTSRecords);
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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 &&
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(BuiltinInfo.builtin_lang & GNU_LANG);
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bool MSModeUnsupported = !LangOpts.MicrosoftExt &&
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(BuiltinInfo.builtin_lang & MS_LANG);
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bool ObjCUnsupported = !LangOpts.ObjC1 &&
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BuiltinInfo.builtin_lang == 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 = NumTSRecords; 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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}
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void
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Builtin::Context::GetBuiltinNames(SmallVectorImpl<const char *> &Names) {
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// Final all target-independent names
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for (unsigned i = Builtin::NotBuiltin+1; i != Builtin::FirstTSBuiltin; ++i)
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if (!strchr(BuiltinInfo[i].Attributes, 'f'))
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Names.push_back(BuiltinInfo[i].Name);
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// Find target-specific names.
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for (unsigned i = 0, e = NumTSRecords; i != e; ++i)
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if (!strchr(TSRecords[i].Attributes, 'f'))
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Names.push_back(TSRecords[i].Name);
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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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