mirror of
https://github.com/apple/swift.git
synced 2025-12-14 20:36:38 +01:00
95 lines
2.9 KiB
C++
95 lines
2.9 KiB
C++
//===--- DbgAddrBlockSplitter.cpp -----------------------------------------===//
|
|
//
|
|
// This source file is part of the Swift.org open source project
|
|
//
|
|
// Copyright (c) 2014 - 2021 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
///
|
|
/// This simple pass runs late after all LLVM level optimization passes have
|
|
/// completed and break blocks at llvm.dbg.addr when we are compiling at
|
|
/// -Onone. This helps us avoid bad behavior in SelectionDAG where SelectionDAG
|
|
/// in certain cases sink llvm.dbg.addr to the end of blocks.
|
|
///
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "swift/LLVMPasses/Passes.h"
|
|
#include "swift/LLVMPasses/PassesFwd.h"
|
|
#include "llvm/IR/IntrinsicInst.h"
|
|
#include "llvm/Pass.h"
|
|
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
|
|
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
|
|
struct SwiftDbgAddrBlockSplitter : FunctionPass {
|
|
static char ID;
|
|
SwiftDbgAddrBlockSplitter() : FunctionPass(ID) {}
|
|
|
|
bool runOnFunction(Function &fn) override;
|
|
};
|
|
|
|
} // namespace
|
|
|
|
static bool split(Function &fn) {
|
|
SmallVector<Instruction *, 32> breakBlockPoints;
|
|
|
|
// If we are in the first block,
|
|
|
|
for (auto &block : fn) {
|
|
for (auto &inst : block) {
|
|
if (isa<DbgAddrIntrinsic>(&inst)) {
|
|
breakBlockPoints.push_back(&*std::next(inst.getIterator()));
|
|
}
|
|
}
|
|
}
|
|
|
|
if (breakBlockPoints.empty())
|
|
return false;
|
|
|
|
bool madeChange = false;
|
|
|
|
while (!breakBlockPoints.empty()) {
|
|
auto *i = breakBlockPoints.pop_back_val();
|
|
if (i->isTerminator())
|
|
continue;
|
|
SplitBlock(i->getParent(), i);
|
|
madeChange = true;
|
|
}
|
|
|
|
return madeChange;
|
|
}
|
|
|
|
bool SwiftDbgAddrBlockSplitter::runOnFunction(Function &fn) {
|
|
return split(fn);
|
|
}
|
|
|
|
char SwiftDbgAddrBlockSplitter::ID = 0;
|
|
INITIALIZE_PASS_BEGIN(SwiftDbgAddrBlockSplitter,
|
|
"swift-dbg-addr-block-splitter",
|
|
"Swift pass that splits blocks after llvm.dbg.addr",
|
|
false, false)
|
|
INITIALIZE_PASS_END(SwiftDbgAddrBlockSplitter, "swift-dbg-addr-block-splitter",
|
|
"Swift pass that splits blocks after llvm.dbg.addr", false,
|
|
false)
|
|
|
|
llvm::FunctionPass *swift::createSwiftDbgAddrBlockSplitter() {
|
|
initializeSwiftDbgAddrBlockSplitterPass(
|
|
*llvm::PassRegistry::getPassRegistry());
|
|
return new SwiftDbgAddrBlockSplitter();
|
|
}
|
|
|
|
llvm::PreservedAnalyses
|
|
swift::SwiftDbgAddrBlockSplitterPass::run(llvm::Function &F,
|
|
llvm::FunctionAnalysisManager &AM) {
|
|
bool changed = split(F);
|
|
if (!changed)
|
|
return PreservedAnalyses::all();
|
|
return PreservedAnalyses::none();
|
|
}
|