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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
81 lines
2.9 KiB
C++
81 lines
2.9 KiB
C++
//===- StripGCRelocates.cpp - Remove gc.relocates inserted by RewriteStatePoints===//
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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 is a little utility pass that removes the gc.relocates inserted by
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// RewriteStatepointsForGC. Note that the generated IR is incorrect,
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// but this is useful as a single pass in itself, for analysis of IR, without
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// the GC.relocates. The statepoint and gc.result instrinsics would still be
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// present.
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/Function.h"
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#include "llvm/IR/InstIterator.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/Statepoint.h"
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#include "llvm/IR/Type.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Transforms/Scalar.h"
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using namespace llvm;
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namespace {
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struct StripGCRelocates : public FunctionPass {
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static char ID; // Pass identification, replacement for typeid
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StripGCRelocates() : FunctionPass(ID) {
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initializeStripGCRelocatesPass(*PassRegistry::getPassRegistry());
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}
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void getAnalysisUsage(AnalysisUsage &Info) const override {}
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bool runOnFunction(Function &F) override;
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};
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char StripGCRelocates::ID = 0;
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}
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bool StripGCRelocates::runOnFunction(Function &F) {
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// Nothing to do for declarations.
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if (F.isDeclaration())
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return false;
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SmallVector<GCRelocateInst *, 20> GCRelocates;
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// TODO: We currently do not handle gc.relocates that are in landing pads,
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// i.e. not bound to a single statepoint token.
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for (Instruction &I : instructions(F)) {
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if (auto *GCR = dyn_cast<GCRelocateInst>(&I))
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if (isStatepoint(GCR->getOperand(0)))
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GCRelocates.push_back(GCR);
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}
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// All gc.relocates are bound to a single statepoint token. The order of
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// visiting gc.relocates for deletion does not matter.
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for (GCRelocateInst *GCRel : GCRelocates) {
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Value *OrigPtr = GCRel->getDerivedPtr();
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Value *ReplaceGCRel = OrigPtr;
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// All gc_relocates are i8 addrspace(1)* typed, we need a bitcast from i8
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// addrspace(1)* to the type of the OrigPtr, if the are not the same.
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if (GCRel->getType() != OrigPtr->getType())
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ReplaceGCRel = new BitCastInst(OrigPtr, GCRel->getType(), "cast", GCRel);
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// Replace all uses of gc.relocate and delete the gc.relocate
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// There maybe unncessary bitcasts back to the OrigPtr type, an instcombine
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// pass would clear this up.
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GCRel->replaceAllUsesWith(ReplaceGCRel);
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GCRel->eraseFromParent();
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}
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return !GCRelocates.empty();
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}
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INITIALIZE_PASS(StripGCRelocates, "strip-gc-relocates",
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"Strip gc.relocates inserted through RewriteStatepointsForGC",
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true, false)
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FunctionPass *llvm::createStripGCRelocatesPass() {
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return new StripGCRelocates();
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}
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