128 lines
4.4 KiB
C++
128 lines
4.4 KiB
C++
//===- ValueSymbolTable.cpp - Implement the ValueSymbolTable class --------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the ValueSymbolTable class for the IR library.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/ValueSymbolTable.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/Config/llvm-config.h"
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#include "llvm/IR/GlobalValue.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Type.h"
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#include "llvm/IR/Value.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cassert>
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#include <utility>
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using namespace llvm;
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#define DEBUG_TYPE "valuesymtab"
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// Class destructor
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ValueSymbolTable::~ValueSymbolTable() {
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#ifndef NDEBUG // Only do this in -g mode...
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for (const auto &VI : vmap)
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dbgs() << "Value still in symbol table! Type = '"
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<< *VI.getValue()->getType() << "' Name = '" << VI.getKeyData()
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<< "'\n";
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assert(vmap.empty() && "Values remain in symbol table!");
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#endif
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}
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ValueName *ValueSymbolTable::makeUniqueName(Value *V,
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SmallString<256> &UniqueName) {
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unsigned BaseSize = UniqueName.size();
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while (true) {
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// Trim any suffix off and append the next number.
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UniqueName.resize(BaseSize);
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raw_svector_ostream S(UniqueName);
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if (auto *GV = dyn_cast<GlobalValue>(V)) {
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// A dot is appended to mark it as clone during ABI demangling so that
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// for example "_Z1fv" and "_Z1fv.1" both demangle to "f()", the second
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// one being a clone.
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// On NVPTX we cannot use a dot because PTX only allows [A-Za-z0-9_$] for
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// identifiers. This breaks ABI demangling but at least ptxas accepts and
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// compiles the program.
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const Module *M = GV->getParent();
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if (!(M && Triple(M->getTargetTriple()).isNVPTX()))
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S << ".";
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}
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S << ++LastUnique;
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// Try insert the vmap entry with this suffix.
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auto IterBool = vmap.insert(std::make_pair(UniqueName, V));
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if (IterBool.second)
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return &*IterBool.first;
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}
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}
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// Insert a value into the symbol table with the specified name...
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//
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void ValueSymbolTable::reinsertValue(Value *V) {
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assert(V->hasName() && "Can't insert nameless Value into symbol table");
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// Try inserting the name, assuming it won't conflict.
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if (vmap.insert(V->getValueName())) {
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// LLVM_DEBUG(dbgs() << " Inserted value: " << V->getValueName() << ": " <<
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// *V << "\n");
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return;
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}
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// Otherwise, there is a naming conflict. Rename this value.
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SmallString<256> UniqueName(V->getName().begin(), V->getName().end());
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// The name is too already used, just free it so we can allocate a new name.
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MallocAllocator Allocator;
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V->getValueName()->Destroy(Allocator);
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ValueName *VN = makeUniqueName(V, UniqueName);
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V->setValueName(VN);
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}
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void ValueSymbolTable::removeValueName(ValueName *V) {
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// LLVM_DEBUG(dbgs() << " Removing Value: " << V->getKeyData() << "\n");
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// Remove the value from the symbol table.
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vmap.remove(V);
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}
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/// createValueName - This method attempts to create a value name and insert
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/// it into the symbol table with the specified name. If it conflicts, it
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/// auto-renames the name and returns that instead.
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ValueName *ValueSymbolTable::createValueName(StringRef Name, Value *V) {
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// In the common case, the name is not already in the symbol table.
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auto IterBool = vmap.insert(std::make_pair(Name, V));
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if (IterBool.second) {
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// LLVM_DEBUG(dbgs() << " Inserted value: " << Entry.getKeyData() << ": "
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// << *V << "\n");
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return &*IterBool.first;
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}
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// Otherwise, there is a naming conflict. Rename this value.
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SmallString<256> UniqueName(Name.begin(), Name.end());
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return makeUniqueName(V, UniqueName);
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}
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#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
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// dump - print out the symbol table
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//
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LLVM_DUMP_METHOD void ValueSymbolTable::dump() const {
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// dbgs() << "ValueSymbolTable:\n";
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for (const auto &I : *this) {
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// dbgs() << " '" << I->getKeyData() << "' = ";
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I.getValue()->dump();
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// dbgs() << "\n";
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}
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}
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#endif
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