54 lines
2 KiB
C++
54 lines
2 KiB
C++
|
//===- InferFunctionAttrs.cpp - Infer implicit function attributes --------===//
|
||
|
|
//
|
||
|
|
// 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/InferFunctionAttrs.h"
|
||
|
|
#include "llvm/Analysis/TargetLibraryInfo.h"
|
||
|
|
#include "llvm/IR/Function.h"
|
||
|
|
#include "llvm/IR/Module.h"
|
||
|
|
#include "llvm/Transforms/Utils/BuildLibCalls.h"
|
||
|
|
#include "llvm/Transforms/Utils/Local.h"
|
||
|
|
using namespace llvm;
|
||
|
|
|
||
|
|
#define DEBUG_TYPE "inferattrs"
|
||
|
|
|
||
|
|
static bool inferAllPrototypeAttributes(
|
||
|
|
Module &M, function_ref<TargetLibraryInfo &(Function &)> GetTLI) {
|
||
|
|
bool Changed = false;
|
||
|
|
|
||
|
|
for (Function &F : M.functions())
|
||
|
|
// We only infer things using the prototype and the name; we don't need
|
||
|
|
// definitions. This ensures libfuncs are annotated and also allows our
|
||
|
|
// CGSCC inference to avoid needing to duplicate the inference from other
|
||
|
|
// attribute logic on all calls to declarations (as declarations aren't
|
||
|
|
// explicitly visited by CGSCC passes in the new pass manager.)
|
||
|
|
if (F.isDeclaration() && !F.hasOptNone()) {
|
||
|
|
if (!F.hasFnAttribute(Attribute::NoBuiltin))
|
||
|
|
Changed |= inferNonMandatoryLibFuncAttrs(F, GetTLI(F));
|
||
|
|
Changed |= inferAttributesFromOthers(F);
|
||
|
|
}
|
||
|
|
|
||
|
|
return Changed;
|
||
|
|
}
|
||
|
|
|
||
|
|
PreservedAnalyses InferFunctionAttrsPass::run(Module &M,
|
||
|
|
ModuleAnalysisManager &AM) {
|
||
|
|
FunctionAnalysisManager &FAM =
|
||
|
|
AM.getResult<FunctionAnalysisManagerModuleProxy>(M).getManager();
|
||
|
|
auto GetTLI = [&FAM](Function &F) -> TargetLibraryInfo & {
|
||
|
|
return FAM.getResult<TargetLibraryAnalysis>(F);
|
||
|
|
};
|
||
|
|
|
||
|
|
if (!inferAllPrototypeAttributes(M, GetTLI))
|
||
|
|
// If we didn't infer anything, preserve all analyses.
|
||
|
|
return PreservedAnalyses::all();
|
||
|
|
|
||
|
|
// Otherwise, we may have changed fundamental function attributes, so clear
|
||
|
|
// out all the passes.
|
||
|
|
return PreservedAnalyses::none();
|
||
|
|
}
|