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4017501a4c
This re-instates commit cc9e53bb08 with a fix for LLDB (rdar://124228107)
rdar://123772098
112 lines
3.4 KiB
C++
112 lines
3.4 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/SILBuilder.h"
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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/InstructionDeleter.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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switch (bi->getBuiltinInfo().ID) {
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case BuiltinValueKind::CondFailMessage: {
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SILBuilderWithScope Builder(bi);
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Builder.createCondFail(bi->getLoc(), bi->getOperand(0),
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"unknown program error");
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LLVM_FALLTHROUGH;
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}
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case BuiltinValueKind::PoundAssert:
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case BuiltinValueKind::StaticReport: {
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// The call to the builtin should get removed before we reach
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// IRGen.
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InstructionDeleter deleter;
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deleter.forceDelete(bi);
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// StaticReport only takes trivial operands, and therefore doesn't
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// require fixing the lifetime of its operands.
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deleter.cleanupDeadInstructions();
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madeChange = true;
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break;
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}
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default:
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break;
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}
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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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if (getOptions().EmbeddedSwift) {
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// In embedded swift all the code is generated in the top-level module.
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// Even de-serialized functions must be code-gen'd.
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SILLinkage linkage = F->getLinkage();
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if (isAvailableExternally(linkage)) {
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F->setLinkage(stripExternalFromLinkage(linkage));
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}
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}
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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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