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ShadowStackCollector, which additionally has reduced overhead with no sacrifice in portability. Considering a function @fun with 8 loop-local roots, ShadowStackCollector introduces the following overhead (x86): ; shadowstack prologue movl L_llvm_gc_root_chain$non_lazy_ptr, %eax movl (%eax), %ecx movl $___gc_fun, 20(%esp) movl $0, 24(%esp) movl $0, 28(%esp) movl $0, 32(%esp) movl $0, 36(%esp) movl $0, 40(%esp) movl $0, 44(%esp) movl $0, 48(%esp) movl $0, 52(%esp) movl %ecx, 16(%esp) leal 16(%esp), %ecx movl %ecx, (%eax) ; shadowstack loop overhead (none) ; shadowstack epilogue movl 48(%esp), %edx movl %edx, (%ecx) ; shadowstack metadata .align 3 ___gc_fun: # __gc_fun .long 8 .space 4 In comparison to LowerGC: ; lowergc prologue movl L_llvm_gc_root_chain$non_lazy_ptr, %eax movl (%eax), %ecx movl %ecx, 48(%esp) movl $8, 52(%esp) movl $0, 60(%esp) movl $0, 56(%esp) movl $0, 68(%esp) movl $0, 64(%esp) movl $0, 76(%esp) movl $0, 72(%esp) movl $0, 84(%esp) movl $0, 80(%esp) movl $0, 92(%esp) movl $0, 88(%esp) movl $0, 100(%esp) movl $0, 96(%esp) movl $0, 108(%esp) movl $0, 104(%esp) movl $0, 116(%esp) movl $0, 112(%esp) ; lowergc loop overhead leal 44(%esp), %eax movl %eax, 56(%esp) leal 40(%esp), %eax movl %eax, 64(%esp) leal 36(%esp), %eax movl %eax, 72(%esp) leal 32(%esp), %eax movl %eax, 80(%esp) leal 28(%esp), %eax movl %eax, 88(%esp) leal 24(%esp), %eax movl %eax, 96(%esp) leal 20(%esp), %eax movl %eax, 104(%esp) leal 16(%esp), %eax movl %eax, 112(%esp) ; lowergc epilogue movl 48(%esp), %edx movl %edx, (%ecx) ; lowergc metadata (none) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45670 91177308-0d34-0410-b5e6-96231b3b80d8
128 lines
5.2 KiB
C++
128 lines
5.2 KiB
C++
//===- llvm/LinkAllPasses.h ------------ Reference All Passes ---*- C++ -*-===//
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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 header file pulls in all transformation and analysis passes for tools
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// like opt and bugpoint that need this functionality.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LINKALLPASSES_H
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#define LLVM_LINKALLPASSES_H
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#include "llvm/Analysis/AliasSetTracker.h"
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#include "llvm/Analysis/FindUsedTypes.h"
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#include "llvm/Analysis/IntervalPartition.h"
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#include "llvm/Analysis/LoadValueNumbering.h"
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#include "llvm/Analysis/Passes.h"
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#include "llvm/Analysis/PostDominators.h"
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#include "llvm/Analysis/ScalarEvolution.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/Function.h"
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#include "llvm/Transforms/Instrumentation.h"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Transforms/Utils/UnifyFunctionExitNodes.h"
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#include <cstdlib>
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namespace {
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struct ForcePassLinking {
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ForcePassLinking() {
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// We must reference the passes in such a way that compilers will not
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// delete it all as dead code, even with whole program optimization,
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// yet is effectively a NO-OP. As the compiler isn't smart enough
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// to know that getenv() never returns -1, this will do the job.
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if (std::getenv("bar") != (char*) -1)
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return;
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(void) llvm::createAAEvalPass();
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(void) llvm::createAggressiveDCEPass();
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(void) llvm::createAliasAnalysisCounterPass();
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(void) llvm::createAliasDebugger();
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(void) llvm::createAndersensPass();
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(void) llvm::createArgumentPromotionPass();
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(void) llvm::createBasicAliasAnalysisPass();
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(void) llvm::createBasicVNPass();
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(void) llvm::createBlockPlacementPass();
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(void) llvm::createBlockProfilerPass();
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(void) llvm::createBreakCriticalEdgesPass();
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(void) llvm::createCFGSimplificationPass();
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(void) llvm::createConstantMergePass();
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(void) llvm::createConstantPropagationPass();
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(void) llvm::createCorrelatedExpressionEliminationPass();
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(void) llvm::createDeadArgEliminationPass();
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(void) llvm::createDeadCodeEliminationPass();
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(void) llvm::createDeadInstEliminationPass();
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(void) llvm::createDeadStoreEliminationPass();
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(void) llvm::createDeadTypeEliminationPass();
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(void) llvm::createEdgeProfilerPass();
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(void) llvm::createFunctionInliningPass();
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(void) llvm::createFunctionProfilerPass();
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(void) llvm::createGCSEPass();
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(void) llvm::createGlobalDCEPass();
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(void) llvm::createGlobalOptimizerPass();
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(void) llvm::createGlobalsModRefPass();
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(void) llvm::createGVNPREPass();
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(void) llvm::createIPConstantPropagationPass();
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(void) llvm::createIPSCCPPass();
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(void) llvm::createIndVarSimplifyPass();
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(void) llvm::createInstructionCombiningPass();
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(void) llvm::createInternalizePass(false);
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(void) llvm::createLCSSAPass();
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(void) llvm::createLICMPass();
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(void) llvm::createLoadValueNumberingPass();
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(void) llvm::createLoopExtractorPass();
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(void) llvm::createLoopSimplifyPass();
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(void) llvm::createLoopStrengthReducePass();
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(void) llvm::createLoopUnrollPass();
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(void) llvm::createLoopUnswitchPass();
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(void) llvm::createLoopRotatePass();
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(void) llvm::createLoopIndexSplitPass();
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(void) llvm::createLowerAllocationsPass();
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(void) llvm::createLowerInvokePass();
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(void) llvm::createLowerPackedPass();
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(void) llvm::createLowerSelectPass();
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(void) llvm::createLowerSetJmpPass();
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(void) llvm::createLowerSwitchPass();
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(void) llvm::createNoAAPass();
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(void) llvm::createNoProfileInfoPass();
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(void) llvm::createProfileLoaderPass();
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(void) llvm::createPromoteMemoryToRegisterPass();
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(void) llvm::createDemoteRegisterToMemoryPass();
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(void) llvm::createPruneEHPass();
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(void) llvm::createRaiseAllocationsPass();
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(void) llvm::createReassociatePass();
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(void) llvm::createSCCPPass();
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(void) llvm::createScalarReplAggregatesPass();
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(void) llvm::createSimplifyLibCallsPass();
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(void) llvm::createSingleLoopExtractorPass();
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(void) llvm::createStripSymbolsPass();
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(void) llvm::createTailCallEliminationPass();
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(void) llvm::createTailDuplicationPass();
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(void) llvm::createUnifyFunctionExitNodesPass();
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(void) llvm::createCondPropagationPass();
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(void) llvm::createNullProfilerRSPass();
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(void) llvm::createRSProfilingPass();
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(void) llvm::createIndMemRemPass();
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(void) llvm::createInstCountPass();
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(void) llvm::createPredicateSimplifierPass();
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(void) llvm::createCodeGenPreparePass();
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(void) llvm::createGVNPass();
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(void)new llvm::IntervalPartition();
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(void)new llvm::FindUsedTypes();
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(void)new llvm::ScalarEvolution();
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((llvm::Function*)0)->viewCFGOnly();
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llvm::AliasSetTracker X(*(llvm::AliasAnalysis*)0);
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X.add((llvm::Value*)0, 0); // for -print-alias-sets
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}
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} ForcePassLinking; // Force link by creating a global definition.
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}
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#endif
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