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//===- ForceFunctionAttrs.cpp - Force function attrs for debugging --------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/IPO/ForceFunctionAttrs.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/InitializePasses.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
#define DEBUG_TYPE "forceattrs"
static cl::list<std::string>
ForceAttributes("force-attribute", cl::Hidden,
cl::desc("Add an attribute to a function. This should be a "
"pair of 'function-name:attribute-name', for "
"example -force-attribute=foo:noinline. This "
"option can be specified multiple times."));
static cl::list<std::string> ForceRemoveAttributes(
"force-remove-attribute", cl::Hidden,
cl::desc("Remove an attribute from a function. This should be a "
"pair of 'function-name:attribute-name', for "
"example -force-remove-attribute=foo:noinline. This "
"option can be specified multiple times."));
static Attribute::AttrKind parseAttrKind(StringRef Kind) {
return StringSwitch<Attribute::AttrKind>(Kind)
.Case("alwaysinline", Attribute::AlwaysInline)
.Case("builtin", Attribute::Builtin)
.Case("cold", Attribute::Cold)
.Case("convergent", Attribute::Convergent)
.Case("inlinehint", Attribute::InlineHint)
.Case("jumptable", Attribute::JumpTable)
.Case("minsize", Attribute::MinSize)
.Case("naked", Attribute::Naked)
.Case("nobuiltin", Attribute::NoBuiltin)
.Case("noduplicate", Attribute::NoDuplicate)
.Case("noimplicitfloat", Attribute::NoImplicitFloat)
.Case("noinline", Attribute::NoInline)
.Case("nonlazybind", Attribute::NonLazyBind)
.Case("noredzone", Attribute::NoRedZone)
.Case("noreturn", Attribute::NoReturn)
.Case("nocf_check", Attribute::NoCfCheck)
.Case("norecurse", Attribute::NoRecurse)
.Case("nounwind", Attribute::NoUnwind)
.Case("optforfuzzing", Attribute::OptForFuzzing)
.Case("optnone", Attribute::OptimizeNone)
.Case("optsize", Attribute::OptimizeForSize)
.Case("readnone", Attribute::ReadNone)
.Case("readonly", Attribute::ReadOnly)
.Case("argmemonly", Attribute::ArgMemOnly)
.Case("returns_twice", Attribute::ReturnsTwice)
.Case("safestack", Attribute::SafeStack)
.Case("shadowcallstack", Attribute::ShadowCallStack)
.Case("sanitize_address", Attribute::SanitizeAddress)
.Case("sanitize_hwaddress", Attribute::SanitizeHWAddress)
.Case("sanitize_memory", Attribute::SanitizeMemory)
.Case("sanitize_thread", Attribute::SanitizeThread)
.Case("sanitize_memtag", Attribute::SanitizeMemTag)
.Case("speculative_load_hardening", Attribute::SpeculativeLoadHardening)
.Case("ssp", Attribute::StackProtect)
.Case("sspreq", Attribute::StackProtectReq)
.Case("sspstrong", Attribute::StackProtectStrong)
.Case("strictfp", Attribute::StrictFP)
.Case("uwtable", Attribute::UWTable)
.Default(Attribute::None);
}
/// If F has any forced attributes given on the command line, add them.
/// If F has any forced remove attributes given on the command line, remove
/// them. When both force and force-remove are given to a function, the latter
/// takes precedence.
static void forceAttributes(Function &F) {
auto ParseFunctionAndAttr = [&](StringRef S) {
auto Kind = Attribute::None;
auto KV = StringRef(S).split(':');
if (KV.first != F.getName())
return Kind;
Kind = parseAttrKind(KV.second);
if (Kind == Attribute::None) {
LLVM_DEBUG(dbgs() << "ForcedAttribute: " << KV.second
<< " unknown or not handled!\n");
}
return Kind;
};
for (auto &S : ForceAttributes) {
auto Kind = ParseFunctionAndAttr(S);
if (Kind == Attribute::None || F.hasFnAttribute(Kind))
continue;
F.addFnAttr(Kind);
}
for (auto &S : ForceRemoveAttributes) {
auto Kind = ParseFunctionAndAttr(S);
if (Kind == Attribute::None || !F.hasFnAttribute(Kind))
continue;
F.removeFnAttr(Kind);
}
}
static bool hasForceAttributes() {
return !ForceAttributes.empty() || !ForceRemoveAttributes.empty();
}
PreservedAnalyses ForceFunctionAttrsPass::run(Module &M,
ModuleAnalysisManager &) {
if (!hasForceAttributes())
return PreservedAnalyses::all();
for (Function &F : M.functions())
forceAttributes(F);
// Just conservatively invalidate analyses, this isn't likely to be important.
return PreservedAnalyses::none();
}
namespace {
struct ForceFunctionAttrsLegacyPass : public ModulePass {
static char ID; // Pass identification, replacement for typeid
ForceFunctionAttrsLegacyPass() : ModulePass(ID) {
initializeForceFunctionAttrsLegacyPassPass(
*PassRegistry::getPassRegistry());
}
bool runOnModule(Module &M) override {
if (!hasForceAttributes())
return false;
for (Function &F : M.functions())
forceAttributes(F);
// Conservatively assume we changed something.
return true;
}
};
}
char ForceFunctionAttrsLegacyPass::ID = 0;
INITIALIZE_PASS(ForceFunctionAttrsLegacyPass, "forceattrs",
"Force set function attributes", false, false)
Pass *llvm::createForceFunctionAttrsLegacyPass() {
return new ForceFunctionAttrsLegacyPass();
}
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