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7e70829632
For details, See: docs/2002-06-25-MegaPatchInfo.txt git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2779 91177308-0d34-0410-b5e6-96231b3b80d8
347 lines
12 KiB
C++
347 lines
12 KiB
C++
//===-- SlotCalculator.cpp - Calculate what slots values land in ------------=//
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//
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// This file implements a useful analysis step to figure out what numbered
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// slots values in a program will land in (keeping track of per plane
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// information as required.
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//
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// This is used primarily for when writing a file to disk, either in bytecode
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// or source format.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/SlotCalculator.h"
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#include "llvm/Analysis/ConstantsScanner.h"
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#include "llvm/Module.h"
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#include "llvm/iOther.h"
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#include "llvm/Constant.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/SymbolTable.h"
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#include "Support/DepthFirstIterator.h"
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#include "Support/STLExtras.h"
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#include <algorithm>
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#if 0
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#define SC_DEBUG(X) cerr << X
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#else
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#define SC_DEBUG(X)
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#endif
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SlotCalculator::SlotCalculator(const Module *M, bool IgnoreNamed) {
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IgnoreNamedNodes = IgnoreNamed;
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TheModule = M;
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// Preload table... Make sure that all of the primitive types are in the table
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// and that their Primitive ID is equal to their slot #
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//
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for (unsigned i = 0; i < Type::FirstDerivedTyID; ++i) {
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assert(Type::getPrimitiveType((Type::PrimitiveID)i));
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insertVal(Type::getPrimitiveType((Type::PrimitiveID)i), true);
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}
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if (M == 0) return; // Empty table...
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processModule();
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}
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SlotCalculator::SlotCalculator(const Function *M, bool IgnoreNamed) {
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IgnoreNamedNodes = IgnoreNamed;
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TheModule = M ? M->getParent() : 0;
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// Preload table... Make sure that all of the primitive types are in the table
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// and that their Primitive ID is equal to their slot #
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//
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for (unsigned i = 0; i < Type::FirstDerivedTyID; ++i) {
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assert(Type::getPrimitiveType((Type::PrimitiveID)i));
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insertVal(Type::getPrimitiveType((Type::PrimitiveID)i), true);
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}
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if (TheModule == 0) return; // Empty table...
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processModule(); // Process module level stuff
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incorporateFunction(M); // Start out in incorporated state
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}
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// processModule - Process all of the module level function declarations and
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// types that are available.
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//
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void SlotCalculator::processModule() {
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SC_DEBUG("begin processModule!\n");
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// Add all of the constants that the global variables might refer to first.
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//
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for (Module::const_giterator I = TheModule->gbegin(), E = TheModule->gend();
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I != E; ++I) {
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if (I->hasInitializer())
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insertValue(I->getInitializer());
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}
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// Add all of the global variables to the value table...
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//
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for(Module::const_giterator I = TheModule->gbegin(), E = TheModule->gend();
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I != E; ++I)
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insertValue(I);
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// Scavenge the types out of the functions, then add the functions themselves
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// to the value table...
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//
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for(Module::const_iterator I = TheModule->begin(), E = TheModule->end();
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I != E; ++I)
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insertValue(I);
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// Insert constants that are named at module level into the slot pool so that
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// the module symbol table can refer to them...
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//
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if (TheModule->hasSymbolTable() && !IgnoreNamedNodes) {
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SC_DEBUG("Inserting SymbolTable values:\n");
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processSymbolTable(TheModule->getSymbolTable());
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}
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SC_DEBUG("end processModule!\n");
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}
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// processSymbolTable - Insert all of the values in the specified symbol table
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// into the values table...
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//
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void SlotCalculator::processSymbolTable(const SymbolTable *ST) {
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for (SymbolTable::const_iterator I = ST->begin(), E = ST->end(); I != E; ++I)
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for (SymbolTable::type_const_iterator TI = I->second.begin(),
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TE = I->second.end(); TI != TE; ++TI)
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insertValue(TI->second);
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}
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void SlotCalculator::processSymbolTableConstants(const SymbolTable *ST) {
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for (SymbolTable::const_iterator I = ST->begin(), E = ST->end(); I != E; ++I)
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for (SymbolTable::type_const_iterator TI = I->second.begin(),
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TE = I->second.end(); TI != TE; ++TI)
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if (isa<Constant>(TI->second))
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insertValue(TI->second);
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}
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void SlotCalculator::incorporateFunction(const Function *M) {
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assert(ModuleLevel.size() == 0 && "Module already incorporated!");
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SC_DEBUG("begin processFunction!\n");
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// Save the Table state before we process the function...
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for (unsigned i = 0; i < Table.size(); ++i)
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ModuleLevel.push_back(Table[i].size());
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SC_DEBUG("Inserting function arguments\n");
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// Iterate over function arguments, adding them to the value table...
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for(Function::const_aiterator I = M->abegin(), E = M->aend(); I != E; ++I)
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insertValue(I);
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// Iterate over all of the instructions in the function, looking for constant
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// values that are referenced. Add these to the value pools before any
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// nonconstant values. This will be turned into the constant pool for the
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// bytecode writer.
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//
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if (!IgnoreNamedNodes) { // Assembly writer does not need this!
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SC_DEBUG("Inserting function constants:\n";
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for (constant_iterator I = constant_begin(M), E = constant_end(M);
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I != E; ++I) {
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cerr << " " << *I->getType()
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<< " " << *I << "\n";
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});
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// Emit all of the constants that are being used by the instructions in the
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// function...
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for_each(constant_begin(M), constant_end(M),
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bind_obj(this, &SlotCalculator::insertValue));
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// If there is a symbol table, it is possible that the user has names for
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// constants that are not being used. In this case, we will have problems
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// if we don't emit the constants now, because otherwise we will get
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// symboltable references to constants not in the output. Scan for these
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// constants now.
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//
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if (M->hasSymbolTable())
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processSymbolTableConstants(M->getSymbolTable());
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}
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SC_DEBUG("Inserting Labels:\n");
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// Iterate over basic blocks, adding them to the value table...
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for (Function::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
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insertValue(I);
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/* for_each(M->begin(), M->end(),
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bind_obj(this, &SlotCalculator::insertValue));*/
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SC_DEBUG("Inserting Instructions:\n");
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// Add all of the instructions to the type planes...
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for_each(inst_begin(M), inst_end(M),
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bind_obj(this, &SlotCalculator::insertValue));
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if (M->hasSymbolTable() && !IgnoreNamedNodes) {
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SC_DEBUG("Inserting SymbolTable values:\n");
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processSymbolTable(M->getSymbolTable());
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}
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SC_DEBUG("end processFunction!\n");
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}
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void SlotCalculator::purgeFunction() {
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assert(ModuleLevel.size() != 0 && "Module not incorporated!");
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unsigned NumModuleTypes = ModuleLevel.size();
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SC_DEBUG("begin purgeFunction!\n");
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// First, remove values from existing type planes
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for (unsigned i = 0; i < NumModuleTypes; ++i) {
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unsigned ModuleSize = ModuleLevel[i]; // Size of plane before function came
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TypePlane &CurPlane = Table[i];
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//SC_DEBUG("Processing Plane " <<i<< " of size " << CurPlane.size() <<endl);
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while (CurPlane.size() != ModuleSize) {
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//SC_DEBUG(" Removing [" << i << "] Value=" << CurPlane.back() << "\n");
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std::map<const Value *, unsigned>::iterator NI =
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NodeMap.find(CurPlane.back());
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assert(NI != NodeMap.end() && "Node not in nodemap?");
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NodeMap.erase(NI); // Erase from nodemap
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CurPlane.pop_back(); // Shrink plane
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}
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}
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// We don't need this state anymore, free it up.
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ModuleLevel.clear();
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// Next, remove any type planes defined by the function...
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while (NumModuleTypes != Table.size()) {
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TypePlane &Plane = Table.back();
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SC_DEBUG("Removing Plane " << (Table.size()-1) << " of size "
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<< Plane.size() << endl);
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while (Plane.size()) {
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NodeMap.erase(NodeMap.find(Plane.back())); // Erase from nodemap
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Plane.pop_back(); // Shrink plane
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}
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Table.pop_back(); // Nuke the plane, we don't like it.
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}
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SC_DEBUG("end purgeFunction!\n");
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}
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int SlotCalculator::getValSlot(const Value *D) const {
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std::map<const Value*, unsigned>::const_iterator I = NodeMap.find(D);
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if (I == NodeMap.end()) return -1;
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return (int)I->second;
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}
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int SlotCalculator::insertValue(const Value *D) {
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if (isa<Constant>(D) || isa<GlobalVariable>(D)) {
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const User *U = cast<const User>(D);
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// This makes sure that if a constant has uses (for example an array
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// of const ints), that they are inserted also. Same for global variable
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// initializers.
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//
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for(User::const_op_iterator I = U->op_begin(), E = U->op_end(); I != E; ++I)
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if (!isa<GlobalValue>(*I)) // Don't chain insert global values
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insertValue(*I);
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}
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int SlotNo = getValSlot(D); // Check to see if it's already in!
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if (SlotNo != -1) return SlotNo;
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return insertVal(D);
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}
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int SlotCalculator::insertVal(const Value *D, bool dontIgnore = false) {
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assert(D && "Can't insert a null value!");
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assert(getValSlot(D) == -1 && "Value is already in the table!");
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// If this node does not contribute to a plane, or if the node has a
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// name and we don't want names, then ignore the silly node... Note that types
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// do need slot numbers so that we can keep track of where other values land.
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//
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if (!dontIgnore) // Don't ignore nonignorables!
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if (D->getType() == Type::VoidTy || // Ignore void type nodes
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(IgnoreNamedNodes && // Ignore named and constants
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(D->hasName() || isa<Constant>(D)) && !isa<Type>(D))) {
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SC_DEBUG("ignored value " << D << endl);
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return -1; // We do need types unconditionally though
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}
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// If it's a type, make sure that all subtypes of the type are included...
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if (const Type *TheTy = dyn_cast<const Type>(D)) {
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// Insert the current type before any subtypes. This is important because
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// recursive types elements are inserted in a bottom up order. Changing
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// this here can break things. For example:
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//
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// global { \2 * } { { \2 }* null }
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//
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int ResultSlot;
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if ((ResultSlot = getValSlot(TheTy)) == -1) {
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ResultSlot = doInsertVal(TheTy);
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SC_DEBUG(" Inserted type: " << TheTy->getDescription() << " slot=" <<
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ResultSlot << endl);
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}
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// Loop over any contained types in the definition... in reverse depth first
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// order. This assures that all of the leafs of a type are output before
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// the type itself is. This also assures us that we will not hit infinite
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// recursion on recursive types...
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//
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for (df_iterator<const Type*> I = df_begin(TheTy, true),
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E = df_end(TheTy); I != E; ++I)
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if (*I != TheTy) {
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// If we haven't seen this sub type before, add it to our type table!
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const Type *SubTy = *I;
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if (getValSlot(SubTy) == -1) {
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SC_DEBUG(" Inserting subtype: " << SubTy->getDescription() << endl);
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int Slot = doInsertVal(SubTy);
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SC_DEBUG(" Inserted subtype: " << SubTy->getDescription() <<
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" slot=" << Slot << endl);
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}
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}
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return ResultSlot;
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}
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// Okay, everything is happy, actually insert the silly value now...
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return doInsertVal(D);
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}
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// doInsertVal - This is a small helper function to be called only be insertVal.
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//
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int SlotCalculator::doInsertVal(const Value *D) {
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const Type *Typ = D->getType();
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unsigned Ty;
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// Used for debugging DefSlot=-1 assertion...
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//if (Typ == Type::TypeTy)
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// cerr << "Inserting type '" << cast<Type>(D)->getDescription() << "'!\n";
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if (Typ->isDerivedType()) {
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int DefSlot = getValSlot(Typ);
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if (DefSlot == -1) { // Have we already entered this type?
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// Nope, this is the first we have seen the type, process it.
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DefSlot = insertVal(Typ, true);
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assert(DefSlot != -1 && "ProcessType returned -1 for a type?");
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}
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Ty = (unsigned)DefSlot;
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} else {
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Ty = Typ->getPrimitiveID();
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}
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if (Table.size() <= Ty) // Make sure we have the type plane allocated...
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Table.resize(Ty+1, TypePlane());
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// Insert node into table and NodeMap...
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unsigned DestSlot = NodeMap[D] = Table[Ty].size();
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Table[Ty].push_back(D);
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SC_DEBUG(" Inserting value [" << Ty << "] = " << D << " slot=" <<
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DestSlot << " [");
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// G = Global, C = Constant, T = Type, F = Function, o = other
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SC_DEBUG((isa<GlobalVariable>(D) ? "G" : (isa<Constant>(D) ? "C" :
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(isa<Type>(D) ? "T" : (isa<Function>(D) ? "F" : "o")))));
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SC_DEBUG("]\n");
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return (int)DestSlot;
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}
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