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`#assert` is a new static assertion statement that will let us write tests for the new constant evaluation infrastructure that we are working on. `#assert` works by lowering to a `Builtin.poundAssert` SIL instruction. The constant evaluation infrastructure will look for these SIL instructions, const-evaluate their conditions, and emit errors if the conditions are non-constant or false. This commit implements parsing, typechecking and SILGen for `#assert`.
90 lines
2.6 KiB
C++
90 lines
2.6 KiB
C++
//===--- IRGenPrepare.cpp -------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2018 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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///
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/// Cleanup SIL to make it suitable for IRGen.
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///
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/// We perform the following canonicalizations:
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///
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/// 1. We remove calls to Builtin.poundAssert() and Builtin.staticReport(),
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/// which are not needed post SIL.
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///
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "sil-cleanup"
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#include "swift/SIL/SILFunction.h"
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#include "swift/SIL/SILInstruction.h"
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#include "swift/SIL/SILModule.h"
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#include "swift/SILOptimizer/PassManager/Passes.h"
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#include "swift/SILOptimizer/PassManager/Transforms.h"
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#include "swift/SILOptimizer/Utils/Local.h"
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#include "swift/Strings.h"
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using namespace swift;
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static bool cleanFunction(SILFunction &fn) {
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bool madeChange = false;
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for (auto &bb : fn) {
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for (auto i = bb.begin(), e = bb.end(); i != e;) {
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// Make sure there is no iterator invalidation if the inspected
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// instruction gets removed from the block.
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SILInstruction *inst = &*i;
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++i;
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// Remove calls to Builtin.poundAssert() and Builtin.staticReport().
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auto *bi = dyn_cast<BuiltinInst>(inst);
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if (!bi) {
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continue;
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}
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const BuiltinInfo &bInfo = bi->getBuiltinInfo();
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if (bInfo.ID != BuiltinValueKind::PoundAssert &&
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bInfo.ID != BuiltinValueKind::StaticReport) {
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continue;
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}
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// The call to the builtin should get removed before we reach
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// IRGen.
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recursivelyDeleteTriviallyDeadInstructions(bi, /* Force */ true);
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madeChange = true;
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}
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}
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return madeChange;
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}
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//===----------------------------------------------------------------------===//
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// Top Level Entrypoint
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//===----------------------------------------------------------------------===//
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namespace {
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class IRGenPrepare : public SILFunctionTransform {
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void run() override {
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SILFunction *F = getFunction();
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bool shouldInvalidate = cleanFunction(*F);
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if (shouldInvalidate)
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invalidateAnalysis(SILAnalysis::InvalidationKind::Instructions);
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}
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};
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} // end anonymous namespace
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SILTransform *swift::createIRGenPrepare() {
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return new IRGenPrepare();
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}
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