134 lines
3.7 KiB
C++
134 lines
3.7 KiB
C++
/*
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* Copyright 2017, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "GlobalAllocPass.h"
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#include "Context.h"
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#include "RSAllocationUtils.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/Debug.h"
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#define DEBUG_TYPE "rs2spirv-global-alloc"
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using namespace llvm;
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namespace rs2spirv {
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namespace {
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bool collectGlobalAllocs(Module &M,
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SmallVectorImpl<GlobalVariable *> &GlobalAllocs) {
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for (auto &GV : M.globals()) {
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if (!isRSAllocation(GV))
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continue;
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DEBUG(GV.dump());
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GlobalAllocs.push_back(&GV);
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}
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return !GlobalAllocs.empty();
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}
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//
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// This pass would enumerate used global rs_allocations (TBD) and
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// lowers calls to accessors of the following type:
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//
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// rsGetAllocationDimX(g)
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//
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// to
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//
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// __rsov_rsGetAllocationDimX(some uninque constant identifying g) */
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//
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// Note the __rsov_* variant is used as a marker for another SPIRIT
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// transformations (see GlobalAllocSPIRITPass.cpp) to expand them into
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// SPIR-V instructions that loads the metadata.
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//
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class GlobalAllocPass : public ModulePass {
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public:
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static char ID;
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GlobalAllocPass()
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: ModulePass(ID), Allocs(Context::getInstance().getGlobalAllocs()) {}
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const char *getPassName() const override { return "GlobalAllocPass"; }
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bool runOnModule(Module &M) override {
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DEBUG(dbgs() << "RS2SPIRVGlobalAllocPass\n");
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DEBUG(M.dump());
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SmallVector<GlobalVariable *, 8> GlobalAllocs;
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const bool CollectRes = collectGlobalAllocs(M, GlobalAllocs);
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if (!CollectRes)
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return false; // Module not modified.
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SmallVector<RSAllocationCallInfo, 8> Calls;
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getRSAllocationInfo(M, Allocs);
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getRSAllocAccesses(Allocs, Calls);
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// Lower the found accessors
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for (auto &C : Calls) {
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assert(C.Kind == RSAllocAccessKind::DIMX &&
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"Unsupported type of accessor call types");
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solidifyRSAllocAccess(M, C);
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}
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// Return true, as the pass modifies module.
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DEBUG(dbgs() << "RS2SPIRVGlobalAllocPass end\n");
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return true;
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}
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private:
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SmallVectorImpl<RSAllocationInfo> &Allocs;
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};
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// A simple pass to remove all global allocations forcibly
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class RemoveAllGlobalAllocPass : public ModulePass {
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public:
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static char ID;
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RemoveAllGlobalAllocPass() : ModulePass(ID) {}
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const char *getPassName() const override {
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return "RemoveAllGlobalAllocPass";
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}
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bool runOnModule(Module &M) override {
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DEBUG(dbgs() << "RemoveAllGlobalAllocPass\n");
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DEBUG(M.dump());
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SmallVector<GlobalVariable *, 8> GlobalAllocs;
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const bool CollectRes = collectGlobalAllocs(M, GlobalAllocs);
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if (!CollectRes)
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return false; // Module not modified.
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// Remove global allocations
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for (auto *G : GlobalAllocs) {
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G->eraseFromParent();
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}
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DEBUG(dbgs() << "RemoveAllGlobalAllocPass end\n");
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DEBUG(M.dump());
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// Return true, as the pass modifies module.
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return true;
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}
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};
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} // namespace
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char GlobalAllocPass::ID = 0;
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char RemoveAllGlobalAllocPass::ID = 0;
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ModulePass *createRemoveAllGlobalAllocPass() {
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return new RemoveAllGlobalAllocPass();
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}
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ModulePass *createGlobalAllocPass() { return new GlobalAllocPass(); }
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} // namespace rs2spirv
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