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//===-- NVPTXAssignValidGlobalNames.cpp - Assign valid names to globals ---===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Clean up the names of global variables in the module to not contain symbols
// that are invalid in PTX.
//
// Currently NVPTX, like other backends, relies on generic symbol name
// sanitizing done by MC. However, the ptxas assembler is more stringent and
// disallows some additional characters in symbol names. This pass makes sure
// such names do not reach MC at all.
//
//===----------------------------------------------------------------------===//
#include "NVPTX.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/raw_ostream.h"
#include <string>
using namespace llvm;
namespace {
/// NVPTXAssignValidGlobalNames
class NVPTXAssignValidGlobalNames : public ModulePass {
public:
static char ID;
NVPTXAssignValidGlobalNames() : ModulePass(ID) {}
bool runOnModule(Module &M) override;
/// Clean up the name to remove symbols invalid in PTX.
std::string cleanUpName(StringRef Name);
};
}
char NVPTXAssignValidGlobalNames::ID = 0;
namespace llvm {
void initializeNVPTXAssignValidGlobalNamesPass(PassRegistry &);
}
INITIALIZE_PASS(NVPTXAssignValidGlobalNames, "nvptx-assign-valid-global-names",
"Assign valid PTX names to globals", false, false)
bool NVPTXAssignValidGlobalNames::runOnModule(Module &M) {
for (GlobalVariable &GV : M.globals()) {
// We are only allowed to rename local symbols.
if (GV.hasLocalLinkage()) {
// setName doesn't do extra work if the name does not change.
// Note: this does not create collisions - if setName is asked to set the
// name to something that already exists, it adds a proper postfix to
// avoid collisions.
GV.setName(cleanUpName(GV.getName()));
}
}
// Do the same for local functions.
for (Function &F : M.functions())
if (F.hasLocalLinkage())
F.setName(cleanUpName(F.getName()));
return true;
}
std::string NVPTXAssignValidGlobalNames::cleanUpName(StringRef Name) {
std::string ValidName;
raw_string_ostream ValidNameStream(ValidName);
for (unsigned I = 0, E = Name.size(); I != E; ++I) {
char C = Name[I];
if (C == '.' || C == '@') {
ValidNameStream << "_$_";
} else {
ValidNameStream << C;
}
}
return ValidNameStream.str();
}
ModulePass *llvm::createNVPTXAssignValidGlobalNamesPass() {
return new NVPTXAssignValidGlobalNames();
}
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