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4017501a4c
This re-instates commit cc9e53bb08 with a fix for LLDB (rdar://124228107)
rdar://123772098
108 lines
3.7 KiB
C++
108 lines
3.7 KiB
C++
//===--- Link.cpp - Link in transparent SILFunctions from module ----------===//
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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 - 2017 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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#include "swift/SILOptimizer/PassManager/Passes.h"
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#include "swift/SILOptimizer/PassManager/Transforms.h"
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#include "swift/SIL/SILModule.h"
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#include "swift/Serialization/SerializedSILLoader.h"
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using namespace swift;
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static llvm::cl::opt<bool> LinkEmbeddedRuntime("link-embedded-runtime",
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llvm::cl::init(true));
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//===----------------------------------------------------------------------===//
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// Top Level Driver
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//===----------------------------------------------------------------------===//
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namespace {
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/// Copies code from the standard library into the user program to enable
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/// optimizations.
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class SILLinker : public SILModuleTransform {
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SILModule::LinkingMode LinkMode;
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public:
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explicit SILLinker(SILModule::LinkingMode LinkMode) : LinkMode(LinkMode) {}
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void run() override {
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SILModule &M = *getModule();
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for (auto &Fn : M)
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if (M.linkFunction(&Fn, LinkMode))
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invalidateAnalysis(&Fn, SILAnalysis::InvalidationKind::Everything);
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// In embedded Swift, the stdlib contains all the runtime functions needed
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// (swift_retain, etc.). Link them in so they can be referenced in IRGen.
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if (M.getOptions().EmbeddedSwift && LinkEmbeddedRuntime) {
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linkEmbeddedRuntimeFromStdlib();
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}
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}
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void linkEmbeddedRuntimeFromStdlib() {
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using namespace RuntimeConstants;
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#define FUNCTION(ID, NAME, CC, AVAILABILITY, RETURNS, ARGS, ATTRS, EFFECT, \
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MEMORY_EFFECTS) \
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linkEmbeddedRuntimeFunctionByName(#NAME, EFFECT);
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#define RETURNS(...)
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#define ARGS(...)
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#define NO_ARGS
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#define ATTRS(...)
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#define NO_ATTRS
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#define EFFECT(...) { __VA_ARGS__ }
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#define MEMORY_EFFECTS(...)
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#define UNKNOWN_MEMEFFECTS
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#include "swift/Runtime/RuntimeFunctions.def"
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}
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void linkEmbeddedRuntimeFunctionByName(StringRef name,
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ArrayRef<RuntimeEffect> effects) {
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SILModule &M = *getModule();
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bool allocating = false;
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for (RuntimeEffect rt : effects)
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if (rt == RuntimeEffect::Allocating || rt == RuntimeEffect::Deallocating)
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allocating = true;
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// Don't link allocating runtime functions in -no-allocations mode.
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if (M.getOptions().NoAllocations && allocating) return;
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// Bail if runtime function is already loaded.
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if (M.lookUpFunction(name)) return;
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SILFunction *Fn =
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M.getSILLoader()->lookupSILFunction(name, SILLinkage::PublicExternal);
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if (!Fn) return;
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if (M.linkFunction(Fn, LinkMode))
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invalidateAnalysis(Fn, SILAnalysis::InvalidationKind::Everything);
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// Make sure that dead-function-elimination doesn't remove runtime functions.
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// TODO: lazily emit runtime functions in IRGen so that we don't have to
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// rely on dead-stripping in the linker to remove unused runtime
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// functions.
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if (Fn->isDefinition())
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Fn->setLinkage(SILLinkage::Public);
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}
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};
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} // end anonymous namespace
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SILTransform *swift::createMandatorySILLinker() {
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return new SILLinker(SILModule::LinkingMode::LinkNormal);
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}
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SILTransform *swift::createPerformanceSILLinker() {
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return new SILLinker(SILModule::LinkingMode::LinkAll);
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}
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