94 lines
2.7 KiB
C++
94 lines
2.7 KiB
C++
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//===- Formula.cpp ----------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Analysis/FlowSensitive/Formula.h"
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#include "clang/Basic/LLVM.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/Allocator.h"
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#include "llvm/Support/ErrorHandling.h"
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#include <cassert>
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#include <type_traits>
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namespace clang::dataflow {
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const Formula &Formula::create(llvm::BumpPtrAllocator &Alloc, Kind K,
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ArrayRef<const Formula *> Operands,
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unsigned Value) {
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assert(Operands.size() == numOperands(K));
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if (Value != 0) // Currently, formulas have values or operands, not both.
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assert(numOperands(K) == 0);
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void *Mem = Alloc.Allocate(sizeof(Formula) +
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Operands.size() * sizeof(Operands.front()),
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alignof(Formula));
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Formula *Result = new (Mem) Formula();
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Result->FormulaKind = K;
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Result->Value = Value;
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// Operands are stored as `const Formula *`s after the formula itself.
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// We don't need to construct an object as pointers are trivial types.
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// Formula is alignas(const Formula *), so alignment is satisfied.
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llvm::copy(Operands, reinterpret_cast<const Formula **>(Result + 1));
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return *Result;
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}
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static llvm::StringLiteral sigil(Formula::Kind K) {
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switch (K) {
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case Formula::AtomRef:
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case Formula::Literal:
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return "";
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case Formula::Not:
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return "!";
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case Formula::And:
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return " & ";
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case Formula::Or:
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return " | ";
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case Formula::Implies:
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return " => ";
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case Formula::Equal:
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return " = ";
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}
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llvm_unreachable("unhandled formula kind");
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}
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void Formula::print(llvm::raw_ostream &OS, const AtomNames *Names) const {
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if (Names && kind() == AtomRef)
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if (auto It = Names->find(getAtom()); It != Names->end()) {
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OS << It->second;
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return;
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}
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switch (numOperands(kind())) {
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case 0:
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switch (kind()) {
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case AtomRef:
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OS << getAtom();
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break;
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case Literal:
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OS << (literal() ? "true" : "false");
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break;
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default:
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llvm_unreachable("unhandled formula kind");
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}
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break;
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case 1:
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OS << sigil(kind());
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operands()[0]->print(OS, Names);
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break;
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case 2:
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OS << '(';
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operands()[0]->print(OS, Names);
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OS << sigil(kind());
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operands()[1]->print(OS, Names);
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OS << ')';
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break;
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default:
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llvm_unreachable("unhandled formula arity");
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}
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}
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} // namespace clang::dataflow
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