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8b4d890cfd
Summary: There are functions using the term 'funclet' to refer to both 1. an EH scopes, the structure of BBs that starts with catchpad/cleanuppad and ends with catchret/cleanupret, and 2. a small function that gets outlined in AsmPrinter, which is the original meaning of 'funclet'. So far the two have been the same thing; EH scopes are always outlined in AsmPrinter as funclets at the end of the compilation pipeline. But now wasm also uses scope-based EH but does not outline those, so we now need to correctly distinguish those two use cases in functions. This patch splits `MachineBasicBlock::isFuncletEntry` into `isFuncletEntry` and `isEHScopeEntry`, and `MachineFunction::hasFunclets` into `hasFunclets` and `hasEHScopes`, in order to distinguish the two different use cases. And this also changes some uses of the term 'funclet' to 'scope' in `getFuncletMembership` and change the function name to `getEHScopeMembership` because this function is not about outlined funclets but about EH scope memberships. This change is in the same vein as D45559. Reviewers: majnemer, dschuff Subscribers: sbc100, jgravelle-google, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D47005 llvm-svn: 333045
60 lines
2.0 KiB
C++
60 lines
2.0 KiB
C++
//===-- FuncletLayout.cpp - Contiguously lay out funclets -----------------===//
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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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// This file implements basic block placement transformations which result in
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// funclets being contiguous.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/Analysis.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/Passes.h"
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using namespace llvm;
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#define DEBUG_TYPE "funclet-layout"
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namespace {
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class FuncletLayout : public MachineFunctionPass {
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public:
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static char ID; // Pass identification, replacement for typeid
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FuncletLayout() : MachineFunctionPass(ID) {
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initializeFuncletLayoutPass(*PassRegistry::getPassRegistry());
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}
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bool runOnMachineFunction(MachineFunction &F) override;
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MachineFunctionProperties getRequiredProperties() const override {
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return MachineFunctionProperties().set(
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MachineFunctionProperties::Property::NoVRegs);
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}
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};
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}
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char FuncletLayout::ID = 0;
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char &llvm::FuncletLayoutID = FuncletLayout::ID;
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INITIALIZE_PASS(FuncletLayout, DEBUG_TYPE,
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"Contiguously Lay Out Funclets", false, false)
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bool FuncletLayout::runOnMachineFunction(MachineFunction &F) {
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DenseMap<const MachineBasicBlock *, int> FuncletMembership =
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getEHScopeMembership(F);
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if (FuncletMembership.empty())
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return false;
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F.sort([&](MachineBasicBlock &X, MachineBasicBlock &Y) {
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auto FuncletX = FuncletMembership.find(&X);
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auto FuncletY = FuncletMembership.find(&Y);
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assert(FuncletX != FuncletMembership.end());
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assert(FuncletY != FuncletMembership.end());
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return FuncletX->second < FuncletY->second;
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});
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// Conservatively assume we changed something.
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return true;
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}
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