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//===--- IRGenPrepare.cpp -------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2018 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
///
/// \file
///
/// Cleanup SIL to make it suitable for IRGen.
///
/// We perform the following canonicalizations:
///
/// 1. We remove calls to Builtin.poundAssert() and Builtin.staticReport(),
/// which are not needed post SIL.
///
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "sil-cleanup"
#include "swift/SIL/SILBuilder.h"
#include "swift/SIL/SILFunction.h"
#include "swift/SIL/SILInstruction.h"
#include "swift/SIL/SILModule.h"
#include "swift/SILOptimizer/PassManager/Passes.h"
#include "swift/SILOptimizer/PassManager/Transforms.h"
#include "swift/SILOptimizer/Utils/InstructionDeleter.h"
#include "swift/Strings.h"
using namespace swift;
static bool cleanFunction(SILFunction &fn) {
bool madeChange = false;
for (auto &bb : fn) {
for (auto i = bb.begin(), e = bb.end(); i != e;) {
// Make sure there is no iterator invalidation if the inspected
// instruction gets removed from the block.
SILInstruction *inst = &*i;
++i;
// Remove calls to Builtin.poundAssert() and Builtin.staticReport().
auto *bi = dyn_cast<BuiltinInst>(inst);
if (!bi) {
continue;
}
switch (bi->getBuiltinInfo().ID) {
case BuiltinValueKind::CondFailMessage: {
SILBuilderWithScope Builder(bi);
Builder.createCondFail(bi->getLoc(), bi->getOperand(0),
"unknown program error");
LLVM_FALLTHROUGH;
}
case BuiltinValueKind::PoundAssert:
case BuiltinValueKind::StaticReport: {
// The call to the builtin should get removed before we reach
// IRGen.
InstructionDeleter deleter;
deleter.forceDelete(bi);
// StaticReport only takes trivial operands, and therefore doesn't
// require fixing the lifetime of its operands.
deleter.cleanupDeadInstructions();
madeChange = true;
break;
}
default:
break;
}
}
}
return madeChange;
}
//===----------------------------------------------------------------------===//
// Top Level Entrypoint
//===----------------------------------------------------------------------===//
namespace {
class IRGenPrepare : public SILFunctionTransform {
void run() override {
SILFunction *F = getFunction();
if (getOptions().EmbeddedSwift) {
// In embedded swift all the code is generated in the top-level module.
// Even de-serialized functions must be code-gen'd.
SILLinkage linkage = F->getLinkage();
if (isAvailableExternally(linkage)) {
F->setLinkage(stripExternalFromLinkage(linkage));
}
}
bool shouldInvalidate = cleanFunction(*F);
if (shouldInvalidate)
invalidateAnalysis(SILAnalysis::InvalidationKind::Instructions);
}
};
} // end anonymous namespace
SILTransform *swift::createIRGenPrepare() {
return new IRGenPrepare();
}
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