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ea59814b3d
PTX requires that identifiers consist only of [a-zA-Z0-9_$]. The existing pass already ensured this for globals and this patch adds the cleanup for functions with local linkage. However, there was a different problem in the case of collisions of the adjusted name: The ValueSymbolTable then automatically appended ".N" with increasing Ns to get a unique name while helping the ABI demangling. Special case this behavior to omit the dots and append N directly. This will always give us legal names according to the PTX requirements. Differential Revision: https://reviews.llvm.org/D40573 llvm-svn: 319657
91 lines
2.7 KiB
C++
91 lines
2.7 KiB
C++
//===-- NVPTXAssignValidGlobalNames.cpp - Assign valid names to globals ---===//
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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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// Clean up the names of global variables in the module to not contain symbols
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// that are invalid in PTX.
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//
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// Currently NVPTX, like other backends, relies on generic symbol name
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// sanitizing done by MC. However, the ptxas assembler is more stringent and
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// disallows some additional characters in symbol names. This pass makes sure
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// such names do not reach MC at all.
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//
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//===----------------------------------------------------------------------===//
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#include "NVPTX.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Support/raw_ostream.h"
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#include <string>
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using namespace llvm;
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namespace {
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/// \brief NVPTXAssignValidGlobalNames
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class NVPTXAssignValidGlobalNames : public ModulePass {
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public:
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static char ID;
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NVPTXAssignValidGlobalNames() : ModulePass(ID) {}
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bool runOnModule(Module &M) override;
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/// \brief Clean up the name to remove symbols invalid in PTX.
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std::string cleanUpName(StringRef Name);
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};
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}
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char NVPTXAssignValidGlobalNames::ID = 0;
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namespace llvm {
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void initializeNVPTXAssignValidGlobalNamesPass(PassRegistry &);
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}
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INITIALIZE_PASS(NVPTXAssignValidGlobalNames, "nvptx-assign-valid-global-names",
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"Assign valid PTX names to globals", false, false)
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bool NVPTXAssignValidGlobalNames::runOnModule(Module &M) {
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for (GlobalVariable &GV : M.globals()) {
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// We are only allowed to rename local symbols.
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if (GV.hasLocalLinkage()) {
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// setName doesn't do extra work if the name does not change.
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// Note: this does not create collisions - if setName is asked to set the
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// name to something that already exists, it adds a proper postfix to
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// avoid collisions.
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GV.setName(cleanUpName(GV.getName()));
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}
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}
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// Do the same for local functions.
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for (Function &F : M.functions())
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if (F.hasLocalLinkage())
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F.setName(cleanUpName(F.getName()));
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return true;
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}
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std::string NVPTXAssignValidGlobalNames::cleanUpName(StringRef Name) {
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std::string ValidName;
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raw_string_ostream ValidNameStream(ValidName);
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for (unsigned I = 0, E = Name.size(); I != E; ++I) {
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char C = Name[I];
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if (C == '.' || C == '@') {
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ValidNameStream << "_$_";
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} else {
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ValidNameStream << C;
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}
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}
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return ValidNameStream.str();
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}
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ModulePass *llvm::createNVPTXAssignValidGlobalNamesPass() {
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return new NVPTXAssignValidGlobalNames();
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}
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