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//===- ValueSymbolTable.cpp - Implement the ValueSymbolTable class --------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file implements the ValueSymbolTable class for the IR library.
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/ValueSymbolTable.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/Value.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
#include <utility>
using namespace llvm;
#define DEBUG_TYPE "valuesymtab"
// Class destructor
ValueSymbolTable::~ValueSymbolTable() {
#ifndef NDEBUG // Only do this in -g mode...
for (const auto &VI : vmap)
dbgs() << "Value still in symbol table! Type = '"
<< *VI.getValue()->getType() << "' Name = '" << VI.getKeyData()
<< "'\n";
assert(vmap.empty() && "Values remain in symbol table!");
#endif
}
ValueName *ValueSymbolTable::makeUniqueName(Value *V,
SmallString<256> &UniqueName) {
unsigned BaseSize = UniqueName.size();
while (true) {
// Trim any suffix off and append the next number.
UniqueName.resize(BaseSize);
raw_svector_ostream S(UniqueName);
if (auto *GV = dyn_cast<GlobalValue>(V)) {
// A dot is appended to mark it as clone during ABI demangling so that
// for example "_Z1fv" and "_Z1fv.1" both demangle to "f()", the second
// one being a clone.
// On NVPTX we cannot use a dot because PTX only allows [A-Za-z0-9_$] for
// identifiers. This breaks ABI demangling but at least ptxas accepts and
// compiles the program.
const Module *M = GV->getParent();
if (!(M && Triple(M->getTargetTriple()).isNVPTX()))
S << ".";
}
S << ++LastUnique;
// Try insert the vmap entry with this suffix.
auto IterBool = vmap.insert(std::make_pair(UniqueName.str(), V));
if (IterBool.second)
return &*IterBool.first;
}
}
// Insert a value into the symbol table with the specified name...
//
void ValueSymbolTable::reinsertValue(Value *V) {
assert(V->hasName() && "Can't insert nameless Value into symbol table");
// Try inserting the name, assuming it won't conflict.
if (vmap.insert(V->getValueName())) {
// LLVM_DEBUG(dbgs() << " Inserted value: " << V->getValueName() << ": " <<
// *V << "\n");
return;
}
// Otherwise, there is a naming conflict. Rename this value.
SmallString<256> UniqueName(V->getName().begin(), V->getName().end());
// The name is too already used, just free it so we can allocate a new name.
MallocAllocator Allocator;
V->getValueName()->Destroy(Allocator);
ValueName *VN = makeUniqueName(V, UniqueName);
V->setValueName(VN);
}
void ValueSymbolTable::removeValueName(ValueName *V) {
// LLVM_DEBUG(dbgs() << " Removing Value: " << V->getKeyData() << "\n");
// Remove the value from the symbol table.
vmap.remove(V);
}
/// createValueName - This method attempts to create a value name and insert
/// it into the symbol table with the specified name. If it conflicts, it
/// auto-renames the name and returns that instead.
ValueName *ValueSymbolTable::createValueName(StringRef Name, Value *V) {
if (MaxNameSize > -1 && Name.size() > (unsigned)MaxNameSize)
Name = Name.substr(0, std::max(1u, (unsigned)MaxNameSize));
// In the common case, the name is not already in the symbol table.
auto IterBool = vmap.insert(std::make_pair(Name, V));
if (IterBool.second) {
// LLVM_DEBUG(dbgs() << " Inserted value: " << Entry.getKeyData() << ": "
// << *V << "\n");
return &*IterBool.first;
}
// Otherwise, there is a naming conflict. Rename this value.
SmallString<256> UniqueName(Name.begin(), Name.end());
return makeUniqueName(V, UniqueName);
}
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
// dump - print out the symbol table
//
LLVM_DUMP_METHOD void ValueSymbolTable::dump() const {
// dbgs() << "ValueSymbolTable:\n";
for (const auto &I : *this) {
// dbgs() << " '" << I->getKeyData() << "' = ";
I.getValue()->dump();
// dbgs() << "\n";
}
}
#endif
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