984dc4b9cd
Move WebAssemblyUtilities from Utils to the CodeGen library. It primarily deals in MIR layer types, so it really lives in the CodeGen library. Move a variety of other things around to try create better separation. See issue #64166 for more info on layering. Move llvm/include/CodeGen/WasmAddressSpaces.h back to llvm/lib/Target/WebAssembly/Utils. Differential Revision: https://reviews.llvm.org/D156472
103 lines
3.4 KiB
C++
103 lines
3.4 KiB
C++
//===-- WebAssemblyMCLowerPrePass.cpp - Prepare for MC lower --------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// Some information in MC lowering / asm printing gets generated as
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/// instructions get emitted, but may be necessary at the start, such as for
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/// .globaltype declarations. This pass collects this information.
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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/MachineModuleInfoImpls.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-mclower-prepass"
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namespace {
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class WebAssemblyMCLowerPrePass final : public ModulePass {
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StringRef getPassName() const override {
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return "WebAssembly MC Lower Pre Pass";
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}
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.setPreservesCFG();
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ModulePass::getAnalysisUsage(AU);
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}
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bool runOnModule(Module &M) override;
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public:
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static char ID; // Pass identification, replacement for typeid
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WebAssemblyMCLowerPrePass() : ModulePass(ID) {}
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};
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} // end anonymous namespace
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char WebAssemblyMCLowerPrePass::ID = 0;
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INITIALIZE_PASS(
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WebAssemblyMCLowerPrePass, DEBUG_TYPE,
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"Collects information ahead of time for MC lowering",
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false, false)
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ModulePass *llvm::createWebAssemblyMCLowerPrePass() {
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return new WebAssemblyMCLowerPrePass();
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}
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// NOTE: this is a ModulePass since we need to enforce that this code has run
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// for all functions before AsmPrinter. If this way of doing things is ever
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// suboptimal, we could opt to make it a MachineFunctionPass and instead use
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// something like createBarrierNoopPass() to enforce ordering.
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//
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// The information stored here is essential for emitExternalDecls in the Wasm
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// AsmPrinter
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bool WebAssemblyMCLowerPrePass::runOnModule(Module &M) {
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auto *MMIWP = getAnalysisIfAvailable<MachineModuleInfoWrapperPass>();
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if (!MMIWP)
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return true;
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MachineModuleInfo &MMI = MMIWP->getMMI();
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MachineModuleInfoWasm &MMIW = MMI.getObjFileInfo<MachineModuleInfoWasm>();
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for (Function &F : M) {
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MachineFunction *MF = MMI.getMachineFunction(F);
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if (!MF)
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continue;
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LLVM_DEBUG(dbgs() << "********** MC Lower Pre Pass **********\n"
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"********** Function: "
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<< MF->getName() << '\n');
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for (MachineBasicBlock &MBB : *MF) {
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for (auto &MI : MBB) {
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// FIXME: what should all be filtered out beyond these?
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if (MI.isDebugInstr() || MI.isInlineAsm())
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continue;
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for (MachineOperand &MO : MI.uses()) {
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if (MO.isSymbol()) {
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MMIW.MachineSymbolsUsed.insert(MO.getSymbolName());
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}
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}
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}
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}
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}
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return true;
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}
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