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eb66b33867
I did this a long time ago with a janky python script, but now clang-format has built-in support for this. I fed clang-format every line with a #include and let it re-sort things according to the precise LLVM rules for include ordering baked into clang-format these days. I've reverted a number of files where the results of sorting includes isn't healthy. Either places where we have legacy code relying on particular include ordering (where possible, I'll fix these separately) or where we have particular formatting around #include lines that I didn't want to disturb in this patch. This patch is *entirely* mechanical. If you get merge conflicts or anything, just ignore the changes in this patch and run clang-format over your #include lines in the files. Sorry for any noise here, but it is important to keep these things stable. I was seeing an increasing number of patches with irrelevant re-ordering of #include lines because clang-format was used. This patch at least isolates that churn, makes it easy to skip when resolving conflicts, and gets us to a clean baseline (again). llvm-svn: 304787
108 lines
3.6 KiB
C++
108 lines
3.6 KiB
C++
//===-- WebAssemblyRegNumbering.cpp - Register Numbering ------------------===//
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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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/// \brief This file implements a pass which assigns WebAssembly register
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/// numbers for CodeGen virtual registers.
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///
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//===----------------------------------------------------------------------===//
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#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
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#include "WebAssembly.h"
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#include "WebAssemblyMachineFunctionInfo.h"
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#include "WebAssemblySubtarget.h"
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#include "WebAssemblyUtilities.h"
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#include "llvm/ADT/SCCIterator.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineLoopInfo.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/CodeGen/Passes.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-reg-numbering"
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namespace {
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class WebAssemblyRegNumbering final : public MachineFunctionPass {
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StringRef getPassName() const override {
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return "WebAssembly Register Numbering";
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}
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.setPreservesCFG();
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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bool runOnMachineFunction(MachineFunction &MF) override;
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public:
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static char ID; // Pass identification, replacement for typeid
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WebAssemblyRegNumbering() : MachineFunctionPass(ID) {}
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};
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} // end anonymous namespace
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char WebAssemblyRegNumbering::ID = 0;
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FunctionPass *llvm::createWebAssemblyRegNumbering() {
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return new WebAssemblyRegNumbering();
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}
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bool WebAssemblyRegNumbering::runOnMachineFunction(MachineFunction &MF) {
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DEBUG(dbgs() << "********** Register Numbering **********\n"
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"********** Function: "
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<< MF.getName() << '\n');
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WebAssemblyFunctionInfo &MFI = *MF.getInfo<WebAssemblyFunctionInfo>();
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MachineRegisterInfo &MRI = MF.getRegInfo();
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MFI.initWARegs();
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// WebAssembly argument registers are in the same index space as local
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// variables. Assign the numbers for them first.
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MachineBasicBlock &EntryMBB = MF.front();
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for (MachineInstr &MI : EntryMBB) {
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if (!WebAssembly::isArgument(MI))
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break;
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int64_t Imm = MI.getOperand(1).getImm();
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DEBUG(dbgs() << "Arg VReg " << MI.getOperand(0).getReg() << " -> WAReg "
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<< Imm << "\n");
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MFI.setWAReg(MI.getOperand(0).getReg(), Imm);
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}
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// Then assign regular WebAssembly registers for all remaining used
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// virtual registers. TODO: Consider sorting the registers by frequency of
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// use, to maximize usage of small immediate fields.
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unsigned NumVRegs = MF.getRegInfo().getNumVirtRegs();
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unsigned NumStackRegs = 0;
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// Start the numbering for locals after the arg regs
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unsigned CurReg = MFI.getParams().size();
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for (unsigned VRegIdx = 0; VRegIdx < NumVRegs; ++VRegIdx) {
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unsigned VReg = TargetRegisterInfo::index2VirtReg(VRegIdx);
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// Skip unused registers.
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if (MRI.use_empty(VReg))
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continue;
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// Handle stackified registers.
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if (MFI.isVRegStackified(VReg)) {
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DEBUG(dbgs() << "VReg " << VReg << " -> WAReg "
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<< (INT32_MIN | NumStackRegs) << "\n");
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MFI.setWAReg(VReg, INT32_MIN | NumStackRegs++);
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continue;
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}
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if (MFI.getWAReg(VReg) == WebAssemblyFunctionInfo::UnusedReg) {
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DEBUG(dbgs() << "VReg " << VReg << " -> WAReg " << CurReg << "\n");
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MFI.setWAReg(VReg, CurReg++);
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}
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}
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return true;
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}
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