forked from OSchip/llvm-project
112 lines
3.8 KiB
C++
112 lines
3.8 KiB
C++
//===- ForceFunctionAttrs.cpp - Force function attrs for debugging --------===//
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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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#include "llvm/Transforms/IPO/ForceFunctionAttrs.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/Support/CommandLine.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 "forceattrs"
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static cl::list<std::string>
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ForceAttributes("force-attribute", cl::Hidden,
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cl::desc("Add an attribute to a function. This should be a "
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"pair of 'function-name:attribute-name', for "
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"example -force-attribute=foo:noinline. This "
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"option can be specified multiple times."));
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static cl::list<std::string> ForceRemoveAttributes(
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"force-remove-attribute", cl::Hidden,
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cl::desc("Remove an attribute from a function. This should be a "
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"pair of 'function-name:attribute-name', for "
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"example -force-remove-attribute=foo:noinline. This "
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"option can be specified multiple times."));
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/// If F has any forced attributes given on the command line, add them.
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/// If F has any forced remove attributes given on the command line, remove
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/// them. When both force and force-remove are given to a function, the latter
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/// takes precedence.
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static void forceAttributes(Function &F) {
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auto ParseFunctionAndAttr = [&](StringRef S) {
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auto Kind = Attribute::None;
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auto KV = StringRef(S).split(':');
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if (KV.first != F.getName())
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return Kind;
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Kind = Attribute::getAttrKindFromName(KV.second);
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if (Kind == Attribute::None || !Attribute::canUseAsFnAttr(Kind)) {
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LLVM_DEBUG(dbgs() << "ForcedAttribute: " << KV.second
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<< " unknown or not a function attribute!\n");
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}
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return Kind;
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};
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for (const auto &S : ForceAttributes) {
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auto Kind = ParseFunctionAndAttr(S);
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if (Kind == Attribute::None || F.hasFnAttribute(Kind))
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continue;
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F.addFnAttr(Kind);
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}
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for (const auto &S : ForceRemoveAttributes) {
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auto Kind = ParseFunctionAndAttr(S);
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if (Kind == Attribute::None || !F.hasFnAttribute(Kind))
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continue;
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F.removeFnAttr(Kind);
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}
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}
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static bool hasForceAttributes() {
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return !ForceAttributes.empty() || !ForceRemoveAttributes.empty();
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}
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PreservedAnalyses ForceFunctionAttrsPass::run(Module &M,
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ModuleAnalysisManager &) {
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if (!hasForceAttributes())
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return PreservedAnalyses::all();
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for (Function &F : M.functions())
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forceAttributes(F);
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// Just conservatively invalidate analyses, this isn't likely to be important.
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return PreservedAnalyses::none();
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}
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namespace {
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struct ForceFunctionAttrsLegacyPass : public ModulePass {
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static char ID; // Pass identification, replacement for typeid
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ForceFunctionAttrsLegacyPass() : ModulePass(ID) {
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initializeForceFunctionAttrsLegacyPassPass(
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*PassRegistry::getPassRegistry());
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}
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bool runOnModule(Module &M) override {
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if (!hasForceAttributes())
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return false;
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for (Function &F : M.functions())
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forceAttributes(F);
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// Conservatively assume we changed something.
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return true;
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}
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};
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}
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char ForceFunctionAttrsLegacyPass::ID = 0;
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INITIALIZE_PASS(ForceFunctionAttrsLegacyPass, "forceattrs",
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"Force set function attributes", false, false)
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Pass *llvm::createForceFunctionAttrsLegacyPass() {
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return new ForceFunctionAttrsLegacyPass();
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}
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