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e7d4cc83c7
Summary: Looks like many passes print its pass description as a debug message at the start of each pass, so added that to (mostly newly added) other passes as well. Reviewers: dschuff Subscribers: jgravelle-google, sbc100, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D56142 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@350771 91177308-0d34-0410-b5e6-96231b3b80d8
85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
//===-- WebAssemblyOptimizeReturned.cpp - Optimize "returned" attributes --===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// Optimize calls with "returned" attributes for WebAssembly.
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///
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//===----------------------------------------------------------------------===//
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#include "WebAssembly.h"
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#include "llvm/IR/Dominators.h"
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#include "llvm/IR/InstVisitor.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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#define DEBUG_TYPE "wasm-optimize-returned"
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namespace {
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class OptimizeReturned final : public FunctionPass,
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public InstVisitor<OptimizeReturned> {
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StringRef getPassName() const override {
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return "WebAssembly Optimize Returned";
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}
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.setPreservesCFG();
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AU.addRequired<DominatorTreeWrapperPass>();
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AU.addPreserved<DominatorTreeWrapperPass>();
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FunctionPass::getAnalysisUsage(AU);
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}
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bool runOnFunction(Function &F) override;
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DominatorTree *DT;
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public:
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static char ID;
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OptimizeReturned() : FunctionPass(ID), DT(nullptr) {}
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void visitCallSite(CallSite CS);
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};
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} // End anonymous namespace
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char OptimizeReturned::ID = 0;
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INITIALIZE_PASS(OptimizeReturned, DEBUG_TYPE,
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"Optimize calls with \"returned\" attributes for WebAssembly",
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false, false)
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FunctionPass *llvm::createWebAssemblyOptimizeReturned() {
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return new OptimizeReturned();
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}
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void OptimizeReturned::visitCallSite(CallSite CS) {
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for (unsigned i = 0, e = CS.getNumArgOperands(); i < e; ++i)
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if (CS.paramHasAttr(i, Attribute::Returned)) {
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Instruction *Inst = CS.getInstruction();
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Value *Arg = CS.getArgOperand(i);
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// Ignore constants, globals, undef, etc.
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if (isa<Constant>(Arg))
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continue;
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// Like replaceDominatedUsesWith but using Instruction/Use dominance.
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for (auto UI = Arg->use_begin(), UE = Arg->use_end(); UI != UE;) {
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Use &U = *UI++;
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if (DT->dominates(Inst, U))
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U.set(Inst);
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}
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}
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}
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bool OptimizeReturned::runOnFunction(Function &F) {
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LLVM_DEBUG(dbgs() << "********** Optimize returned Attributes **********\n"
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"********** Function: "
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<< F.getName() << '\n');
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DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
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visit(F);
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return true;
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}
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