forked from OSchip/llvm-project
780 lines
30 KiB
C++
780 lines
30 KiB
C++
//===-- SlotCalculator.cpp - Calculate what slots values land in ----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a useful analysis step to figure out what numbered slots
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// values in a program will land in (keeping track of per plane information).
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//
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// This is used when writing a file to disk, either in bytecode or assembly.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/SlotCalculator.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/iOther.h"
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#include "llvm/Module.h"
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#include "llvm/SymbolTable.h"
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#include "llvm/Analysis/ConstantsScanner.h"
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#include "Support/PostOrderIterator.h"
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#include "Support/STLExtras.h"
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#include <algorithm>
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using namespace llvm;
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#if 0
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#define SC_DEBUG(X) std::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 buildBytecodeInfo) {
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BuildBytecodeInfo = buildBytecodeInfo;
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ModuleContainsAllFunctionConstants = false;
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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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SC_DEBUG("Inserting primitive types:\n");
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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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insertValue(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 buildBytecodeInfo) {
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BuildBytecodeInfo = buildBytecodeInfo;
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ModuleContainsAllFunctionConstants = false;
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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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SC_DEBUG("Inserting primitive types:\n");
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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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insertValue(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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unsigned SlotCalculator::getGlobalSlot(const Value *V) const {
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assert(!CompactionTable.empty() &&
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"This method can only be used when compaction is enabled!");
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if (const ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(V))
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V = CPR->getValue();
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std::map<const Value*, unsigned>::const_iterator I = NodeMap.find(V);
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assert(I != NodeMap.end() && "Didn't find global slot entry!");
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return I->second;
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}
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SlotCalculator::TypePlane &SlotCalculator::getPlane(unsigned Plane) {
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unsigned PIdx = Plane;
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if (CompactionTable.empty()) { // No compaction table active?
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// fall out
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} else if (!CompactionTable[Plane].empty()) { // Compaction table active.
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assert(Plane < CompactionTable.size());
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return CompactionTable[Plane];
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} else {
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// Final case: compaction table active, but this plane is not
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// compactified. If the type plane is compactified, unmap back to the
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// global type plane corresponding to "Plane".
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if (!CompactionTable[Type::TypeTyID].empty()) {
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const Type *Ty = cast<Type>(CompactionTable[Type::TypeTyID][Plane]);
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std::map<const Value*, unsigned>::iterator It = NodeMap.find(Ty);
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assert(It != NodeMap.end() && "Type not in global constant map?");
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PIdx = It->second;
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}
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}
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// Okay we are just returning an entry out of the main Table. Make sure the
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// plane exists and return it.
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if (PIdx >= Table.size())
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Table.resize(PIdx+1);
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return Table[PIdx];
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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 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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getOrCreateSlot(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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getOrCreateSlot(I);
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// Add all of the module level constants used as initializers
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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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getOrCreateSlot(I->getInitializer());
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// Now that all global constants have been added, rearrange constant planes
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// that contain constant strings so that the strings occur at the start of the
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// plane, not somewhere in the middle.
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//
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if (BuildBytecodeInfo) {
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TypePlane &Types = Table[Type::TypeTyID];
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for (unsigned plane = 0, e = Table.size(); plane != e; ++plane) {
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if (const ArrayType *AT = dyn_cast<ArrayType>(Types[plane]))
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if (AT->getElementType() == Type::SByteTy ||
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AT->getElementType() == Type::UByteTy) {
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TypePlane &Plane = Table[plane];
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unsigned FirstNonStringID = 0;
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for (unsigned i = 0, e = Plane.size(); i != e; ++i)
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if (isa<ConstantAggregateZero>(Plane[i]) ||
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cast<ConstantArray>(Plane[i])->isString()) {
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// Check to see if we have to shuffle this string around. If not,
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// don't do anything.
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if (i != FirstNonStringID) {
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// Swap the plane entries....
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std::swap(Plane[i], Plane[FirstNonStringID]);
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// Keep the NodeMap up to date.
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NodeMap[Plane[i]] = i;
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NodeMap[Plane[FirstNonStringID]] = FirstNonStringID;
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}
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++FirstNonStringID;
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}
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}
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}
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}
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// If we are emitting a bytecode file, scan all of the functions for their
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// constants, which allows us to emit more compact modules. This is optional,
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// and is just used to compactify the constants used by different functions
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// together.
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//
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// This functionality is completely optional for the bytecode writer, but
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// tends to produce smaller bytecode files. This should not be used in the
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// future by clients that want to, for example, build and emit functions on
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// the fly. For now, however, it is unconditionally enabled when building
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// bytecode information.
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//
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if (BuildBytecodeInfo) {
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ModuleContainsAllFunctionConstants = true;
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SC_DEBUG("Inserting function constants:\n");
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for (Module::const_iterator F = TheModule->begin(), E = TheModule->end();
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F != E; ++F) {
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for (const_inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I){
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for (unsigned op = 0, e = I->getNumOperands(); op != e; ++op)
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if (isa<Constant>(I->getOperand(op)))
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getOrCreateSlot(I->getOperand(op));
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getOrCreateSlot(I->getType());
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if (const VANextInst *VAN = dyn_cast<VANextInst>(*I))
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getOrCreateSlot(VAN->getArgType());
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}
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processSymbolTableConstants(&F->getSymbolTable());
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}
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}
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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 (BuildBytecodeInfo) {
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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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// Now that we have collected together all of the information relevant to the
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// module, compactify the type table if it is particularly big and outputting
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// a bytecode file. The basic problem we run into is that some programs have
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// a large number of types, which causes the type field to overflow its size,
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// which causes instructions to explode in size (particularly call
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// instructions). To avoid this behavior, we "sort" the type table so that
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// all non-value types are pushed to the end of the type table, giving nice
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// low numbers to the types that can be used by instructions, thus reducing
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// the amount of explodage we suffer.
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if (BuildBytecodeInfo && Table[Type::TypeTyID].size() >= 64) {
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// Scan through the type table moving value types to the start of the table.
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TypePlane *Types = &Table[Type::TypeTyID];
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unsigned FirstNonValueTypeID = 0;
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for (unsigned i = 0, e = Types->size(); i != e; ++i)
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if (cast<Type>((*Types)[i])->isFirstClassType() ||
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cast<Type>((*Types)[i])->isPrimitiveType()) {
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// Check to see if we have to shuffle this type around. If not, don't
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// do anything.
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if (i != FirstNonValueTypeID) {
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assert(i != Type::TypeTyID && FirstNonValueTypeID != Type::TypeTyID &&
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"Cannot move around the type plane!");
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// Swap the type ID's.
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std::swap((*Types)[i], (*Types)[FirstNonValueTypeID]);
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// Keep the NodeMap up to date.
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NodeMap[(*Types)[i]] = i;
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NodeMap[(*Types)[FirstNonValueTypeID]] = FirstNonValueTypeID;
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// When we move a type, make sure to move its value plane as needed.
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if (Table.size() > FirstNonValueTypeID) {
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if (Table.size() <= i) Table.resize(i+1);
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std::swap(Table[i], Table[FirstNonValueTypeID]);
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Types = &Table[Type::TypeTyID];
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}
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}
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++FirstNonValueTypeID;
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}
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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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getOrCreateSlot(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) || isa<Type>(TI->second))
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getOrCreateSlot(TI->second);
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}
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void SlotCalculator::incorporateFunction(const Function *F) {
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assert(ModuleLevel.size() == 0 && "Module already incorporated!");
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SC_DEBUG("begin processFunction!\n");
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// If we emitted all of the function constants, build a compaction table.
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if (BuildBytecodeInfo && ModuleContainsAllFunctionConstants)
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buildCompactionTable(F);
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// Update the ModuleLevel entries to be accurate.
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ModuleLevel.resize(getNumPlanes());
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for (unsigned i = 0, e = getNumPlanes(); i != e; ++i)
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ModuleLevel[i] = getPlane(i).size();
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// Iterate over function arguments, adding them to the value table...
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for(Function::const_aiterator I = F->abegin(), E = F->aend(); I != E; ++I)
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getOrCreateSlot(I);
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if (BuildBytecodeInfo && // Assembly writer does not need this!
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!ModuleContainsAllFunctionConstants) {
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// Iterate over all of the instructions in the function, looking for
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// constant values that are referenced. Add these to the value pools
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// before any nonconstant values. This will be turned into the constant
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// pool for the bytecode writer.
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//
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// Emit all of the constants that are being used by the instructions in
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// the function...
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for_each(constant_begin(F), constant_end(F),
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bind_obj(this, &SlotCalculator::getOrCreateSlot));
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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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// symbol table references to constants not in the output. Scan for these
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// constants now.
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//
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processSymbolTableConstants(&F->getSymbolTable());
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}
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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 (Function::const_iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
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getOrCreateSlot(BB);
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for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I!=E; ++I) {
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getOrCreateSlot(I);
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if (const VANextInst *VAN = dyn_cast<VANextInst>(I))
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getOrCreateSlot(VAN->getArgType());
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}
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}
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// If we are building a compaction table, prune out planes that do not benefit
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// from being compactified.
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if (!CompactionTable.empty())
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pruneCompactionTable();
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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, free the compaction map if used.
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CompactionNodeMap.clear();
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// Next, remove values from existing type planes
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for (unsigned i = 0; i != NumModuleTypes; ++i) {
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// Size of plane before function came
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unsigned ModuleLev = getModuleLevel(i);
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assert(int(ModuleLev) >= 0 && "BAD!");
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TypePlane &Plane = getPlane(i);
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assert(ModuleLev <= Plane.size() && "module levels higher than elements?");
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while (Plane.size() != ModuleLev) {
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assert(!isa<GlobalValue>(Plane.back()) &&
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"Functions cannot define globals!");
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NodeMap.erase(Plane.back()); // Erase from nodemap
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Plane.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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// Finally, remove any type planes defined by the function...
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if (!CompactionTable.empty()) {
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CompactionTable.clear();
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} else {
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while (Table.size() > NumModuleTypes) {
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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() << "\n");
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while (Plane.size()) {
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assert(!isa<GlobalValue>(Plane.back()) &&
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"Functions cannot define globals!");
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NodeMap.erase(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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}
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SC_DEBUG("end purgeFunction!\n");
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}
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static inline bool hasNullValue(unsigned TyID) {
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return TyID != Type::LabelTyID && TyID != Type::TypeTyID &&
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TyID != Type::VoidTyID;
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}
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/// getOrCreateCompactionTableSlot - This method is used to build up the initial
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/// approximation of the compaction table.
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unsigned SlotCalculator::getOrCreateCompactionTableSlot(const Value *V) {
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if (const ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(V))
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V = CPR->getValue();
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std::map<const Value*, unsigned>::iterator I =
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CompactionNodeMap.lower_bound(V);
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if (I != CompactionNodeMap.end() && I->first == V)
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return I->second; // Already exists?
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// Make sure the type is in the table.
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unsigned Ty;
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if (!CompactionTable[Type::TypeTyID].empty())
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Ty = getOrCreateCompactionTableSlot(V->getType());
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else // If the type plane was decompactified, use the global plane ID
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Ty = getSlot(V->getType());
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if (CompactionTable.size() <= Ty)
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CompactionTable.resize(Ty+1);
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assert(!isa<Type>(V) || ModuleLevel.empty());
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TypePlane &TyPlane = CompactionTable[Ty];
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// Make sure to insert the null entry if the thing we are inserting is not a
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// null constant.
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if (TyPlane.empty() && hasNullValue(V->getType()->getPrimitiveID())) {
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Value *ZeroInitializer = Constant::getNullValue(V->getType());
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if (V != ZeroInitializer) {
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TyPlane.push_back(ZeroInitializer);
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CompactionNodeMap[ZeroInitializer] = 0;
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}
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}
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unsigned SlotNo = TyPlane.size();
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TyPlane.push_back(V);
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CompactionNodeMap.insert(std::make_pair(V, SlotNo));
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return SlotNo;
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}
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/// buildCompactionTable - Since all of the function constants and types are
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/// stored in the module-level constant table, we don't need to emit a function
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/// constant table. Also due to this, the indices for various constants and
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/// types might be very large in large programs. In order to avoid blowing up
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/// the size of instructions in the bytecode encoding, we build a compaction
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/// table, which defines a mapping from function-local identifiers to global
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/// identifiers.
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void SlotCalculator::buildCompactionTable(const Function *F) {
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assert(CompactionNodeMap.empty() && "Compaction table already built!");
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// First step, insert the primitive types.
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CompactionTable.resize(Type::TypeTyID+1);
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for (unsigned i = 0; i != Type::FirstDerivedTyID; ++i) {
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const Type *PrimTy = Type::getPrimitiveType((Type::PrimitiveID)i);
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CompactionTable[Type::TypeTyID].push_back(PrimTy);
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CompactionNodeMap[PrimTy] = i;
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}
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// Next, include any types used by function arguments.
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for (Function::const_aiterator I = F->abegin(), E = F->aend(); I != E; ++I)
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getOrCreateCompactionTableSlot(I->getType());
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// Next, find all of the types and values that are referred to by the
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// instructions in the program.
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for (const_inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I) {
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getOrCreateCompactionTableSlot(I->getType());
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for (unsigned op = 0, e = I->getNumOperands(); op != e; ++op)
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if (isa<Constant>(I->getOperand(op)) ||
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isa<GlobalValue>(I->getOperand(op)))
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getOrCreateCompactionTableSlot(I->getOperand(op));
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if (const VANextInst *VAN = dyn_cast<VANextInst>(*I))
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getOrCreateCompactionTableSlot(VAN->getArgType());
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}
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const SymbolTable &ST = F->getSymbolTable();
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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) || isa<Type>(TI->second) ||
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isa<GlobalValue>(TI->second))
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getOrCreateCompactionTableSlot(TI->second);
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// Now that we have all of the values in the table, and know what types are
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// referenced, make sure that there is at least the zero initializer in any
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// used type plane. Since the type was used, we will be emitting instructions
|
|
// to the plane even if there are no constants in it.
|
|
CompactionTable.resize(CompactionTable[Type::TypeTyID].size());
|
|
for (unsigned i = 0, e = CompactionTable.size(); i != e; ++i)
|
|
if (CompactionTable[i].empty() && i != Type::VoidTyID &&
|
|
i != Type::LabelTyID) {
|
|
const Type *Ty = cast<Type>(CompactionTable[Type::TypeTyID][i]);
|
|
getOrCreateCompactionTableSlot(Constant::getNullValue(Ty));
|
|
}
|
|
|
|
// Okay, now at this point, we have a legal compaction table. Since we want
|
|
// to emit the smallest possible binaries, do not compactify the type plane if
|
|
// it will not save us anything. Because we have not yet incorporated the
|
|
// function body itself yet, we don't know whether or not it's a good idea to
|
|
// compactify other planes. We will defer this decision until later.
|
|
TypePlane &GlobalTypes = Table[Type::TypeTyID];
|
|
|
|
// All of the values types will be scrunched to the start of the types plane
|
|
// of the global table. Figure out just how many there are.
|
|
assert(!GlobalTypes.empty() && "No global types???");
|
|
unsigned NumFCTypes = GlobalTypes.size()-1;
|
|
while (!cast<Type>(GlobalTypes[NumFCTypes])->isFirstClassType())
|
|
--NumFCTypes;
|
|
|
|
// If there are fewer that 64 types, no instructions will be exploded due to
|
|
// the size of the type operands. Thus there is no need to compactify types.
|
|
// Also, if the compaction table contains most of the entries in the global
|
|
// table, there really is no reason to compactify either.
|
|
if (NumFCTypes < 64) {
|
|
// Decompactifying types is tricky, because we have to move type planes all
|
|
// over the place. At least we don't need to worry about updating the
|
|
// CompactionNodeMap for non-types though.
|
|
std::vector<TypePlane> TmpCompactionTable;
|
|
std::swap(CompactionTable, TmpCompactionTable);
|
|
TypePlane Types;
|
|
std::swap(Types, TmpCompactionTable[Type::TypeTyID]);
|
|
|
|
// Move each plane back over to the uncompactified plane
|
|
while (!Types.empty()) {
|
|
const Type *Ty = cast<Type>(Types.back());
|
|
Types.pop_back();
|
|
CompactionNodeMap.erase(Ty); // Decompactify type!
|
|
|
|
if (Ty != Type::TypeTy) {
|
|
// Find the global slot number for this type.
|
|
int TySlot = getSlot(Ty);
|
|
assert(TySlot != -1 && "Type doesn't exist in global table?");
|
|
|
|
// Now we know where to put the compaction table plane.
|
|
if (CompactionTable.size() <= unsigned(TySlot))
|
|
CompactionTable.resize(TySlot+1);
|
|
// Move the plane back into the compaction table.
|
|
std::swap(CompactionTable[TySlot], TmpCompactionTable[Types.size()]);
|
|
|
|
// And remove the empty plane we just moved in.
|
|
TmpCompactionTable.pop_back();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/// pruneCompactionTable - Once the entire function being processed has been
|
|
/// incorporated into the current compaction table, look over the compaction
|
|
/// table and check to see if there are any values whose compaction will not
|
|
/// save us any space in the bytecode file. If compactifying these values
|
|
/// serves no purpose, then we might as well not even emit the compactification
|
|
/// information to the bytecode file, saving a bit more space.
|
|
///
|
|
/// Note that the type plane has already been compactified if possible.
|
|
///
|
|
void SlotCalculator::pruneCompactionTable() {
|
|
TypePlane &TyPlane = CompactionTable[Type::TypeTyID];
|
|
for (unsigned ctp = 0, e = CompactionTable.size(); ctp != e; ++ctp)
|
|
if (ctp != Type::TypeTyID && !CompactionTable[ctp].empty()) {
|
|
TypePlane &CPlane = CompactionTable[ctp];
|
|
unsigned GlobalSlot = ctp;
|
|
if (!TyPlane.empty())
|
|
GlobalSlot = getGlobalSlot(TyPlane[ctp]);
|
|
|
|
if (GlobalSlot >= Table.size())
|
|
Table.resize(GlobalSlot+1);
|
|
TypePlane &GPlane = Table[GlobalSlot];
|
|
|
|
unsigned ModLevel = getModuleLevel(ctp);
|
|
unsigned NumFunctionObjs = CPlane.size()-ModLevel;
|
|
|
|
// If the maximum index required if all entries in this plane were merged
|
|
// into the global plane is less than 64, go ahead and eliminate the
|
|
// plane.
|
|
bool PrunePlane = GPlane.size() + NumFunctionObjs < 64;
|
|
|
|
// If there are no function-local values defined, and the maximum
|
|
// referenced global entry is less than 64, we don't need to compactify.
|
|
if (!PrunePlane && NumFunctionObjs == 0) {
|
|
unsigned MaxIdx = 0;
|
|
for (unsigned i = 0; i != ModLevel; ++i) {
|
|
unsigned Idx = NodeMap[CPlane[i]];
|
|
if (Idx > MaxIdx) MaxIdx = Idx;
|
|
}
|
|
PrunePlane = MaxIdx < 64;
|
|
}
|
|
|
|
// Ok, finally, if we decided to prune this plane out of the compaction
|
|
// table, do so now.
|
|
if (PrunePlane) {
|
|
TypePlane OldPlane;
|
|
std::swap(OldPlane, CPlane);
|
|
|
|
// Loop over the function local objects, relocating them to the global
|
|
// table plane.
|
|
for (unsigned i = ModLevel, e = OldPlane.size(); i != e; ++i) {
|
|
const Value *V = OldPlane[i];
|
|
CompactionNodeMap.erase(V);
|
|
assert(NodeMap.count(V) == 0 && "Value already in table??");
|
|
getOrCreateSlot(V);
|
|
}
|
|
|
|
// For compactified global values, just remove them from the compaction
|
|
// node map.
|
|
for (unsigned i = 0; i != ModLevel; ++i)
|
|
CompactionNodeMap.erase(OldPlane[i]);
|
|
|
|
// Update the new modulelevel for this plane.
|
|
assert(ctp < ModuleLevel.size() && "Cannot set modulelevel!");
|
|
ModuleLevel[ctp] = GPlane.size()-NumFunctionObjs;
|
|
assert((int)ModuleLevel[ctp] >= 0 && "Bad computation!");
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
int SlotCalculator::getSlot(const Value *V) const {
|
|
// If there is a CompactionTable active...
|
|
if (!CompactionNodeMap.empty()) {
|
|
std::map<const Value*, unsigned>::const_iterator I =
|
|
CompactionNodeMap.find(V);
|
|
if (I != CompactionNodeMap.end())
|
|
return (int)I->second;
|
|
// Otherwise, if it's not in the compaction table, it must be in a
|
|
// non-compactified plane.
|
|
}
|
|
|
|
std::map<const Value*, unsigned>::const_iterator I = NodeMap.find(V);
|
|
if (I != NodeMap.end())
|
|
return (int)I->second;
|
|
|
|
// Do not number ConstantPointerRef's at all. They are an abomination.
|
|
if (const ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(V))
|
|
return getSlot(CPR->getValue());
|
|
|
|
return -1;
|
|
}
|
|
|
|
|
|
int SlotCalculator::getOrCreateSlot(const Value *V) {
|
|
if (V->getType() == Type::VoidTy) return -1;
|
|
|
|
int SlotNo = getSlot(V); // Check to see if it's already in!
|
|
if (SlotNo != -1) return SlotNo;
|
|
|
|
// Do not number ConstantPointerRef's at all. They are an abomination.
|
|
if (const ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(V))
|
|
return getOrCreateSlot(CPR->getValue());
|
|
|
|
if (!isa<GlobalValue>(V)) // Initializers for globals are handled explicitly
|
|
if (const Constant *C = dyn_cast<Constant>(V)) {
|
|
assert(CompactionNodeMap.empty() &&
|
|
"All needed constants should be in the compaction map already!");
|
|
|
|
// If we are emitting a bytecode file, do not index the characters that
|
|
// make up constant strings. We emit constant strings as special
|
|
// entities that don't require their individual characters to be emitted.
|
|
if (!BuildBytecodeInfo || !isa<ConstantArray>(C) ||
|
|
!cast<ConstantArray>(C)->isString()) {
|
|
// This makes sure that if a constant has uses (for example an array of
|
|
// const ints), that they are inserted also.
|
|
//
|
|
for (User::const_op_iterator I = C->op_begin(), E = C->op_end();
|
|
I != E; ++I)
|
|
getOrCreateSlot(*I);
|
|
} else {
|
|
assert(ModuleLevel.empty() &&
|
|
"How can a constant string be directly accessed in a function?");
|
|
// Otherwise, if we are emitting a bytecode file and this IS a string,
|
|
// remember it.
|
|
if (!C->isNullValue())
|
|
ConstantStrings.push_back(cast<ConstantArray>(C));
|
|
}
|
|
}
|
|
|
|
return insertValue(V);
|
|
}
|
|
|
|
|
|
int SlotCalculator::insertValue(const Value *D, bool dontIgnore) {
|
|
assert(D && "Can't insert a null value!");
|
|
assert(getSlot(D) == -1 && "Value is already in the table!");
|
|
|
|
// If we are building a compaction map, and if this plane is being compacted,
|
|
// insert the value into the compaction map, not into the global map.
|
|
if (!CompactionNodeMap.empty()) {
|
|
if (D->getType() == Type::VoidTy) return -1; // Do not insert void values
|
|
assert(!isa<Type>(D) && !isa<Constant>(D) && !isa<GlobalValue>(D) &&
|
|
"Types, constants, and globals should be in global SymTab!");
|
|
|
|
int Plane = getSlot(D->getType());
|
|
assert(Plane != -1 && CompactionTable.size() > (unsigned)Plane &&
|
|
"Didn't find value type!");
|
|
if (!CompactionTable[Plane].empty())
|
|
return getOrCreateCompactionTableSlot(D);
|
|
}
|
|
|
|
// If this node does not contribute to a plane, or if the node has a
|
|
// name and we don't want names, then ignore the silly node... Note that types
|
|
// do need slot numbers so that we can keep track of where other values land.
|
|
//
|
|
if (!dontIgnore) // Don't ignore nonignorables!
|
|
if (D->getType() == Type::VoidTy || // Ignore void type nodes
|
|
(!BuildBytecodeInfo && // Ignore named and constants
|
|
(D->hasName() || isa<Constant>(D)) && !isa<Type>(D))) {
|
|
SC_DEBUG("ignored value " << *D << "\n");
|
|
return -1; // We do need types unconditionally though
|
|
}
|
|
|
|
// If it's a type, make sure that all subtypes of the type are included...
|
|
if (const Type *TheTy = dyn_cast<Type>(D)) {
|
|
|
|
// Insert the current type before any subtypes. This is important because
|
|
// recursive types elements are inserted in a bottom up order. Changing
|
|
// this here can break things. For example:
|
|
//
|
|
// global { \2 * } { { \2 }* null }
|
|
//
|
|
int ResultSlot = doInsertValue(TheTy);
|
|
SC_DEBUG(" Inserted type: " << TheTy->getDescription() << " slot=" <<
|
|
ResultSlot << "\n");
|
|
|
|
// Loop over any contained types in the definition... in post
|
|
// order.
|
|
//
|
|
for (po_iterator<const Type*> I = po_begin(TheTy), E = po_end(TheTy);
|
|
I != E; ++I) {
|
|
if (*I != TheTy) {
|
|
const Type *SubTy = *I;
|
|
// If we haven't seen this sub type before, add it to our type table!
|
|
if (getSlot(SubTy) == -1) {
|
|
SC_DEBUG(" Inserting subtype: " << SubTy->getDescription() << "\n");
|
|
int Slot = doInsertValue(SubTy);
|
|
SC_DEBUG(" Inserted subtype: " << SubTy->getDescription() <<
|
|
" slot=" << Slot << "\n");
|
|
}
|
|
}
|
|
}
|
|
return ResultSlot;
|
|
}
|
|
|
|
// Okay, everything is happy, actually insert the silly value now...
|
|
return doInsertValue(D);
|
|
}
|
|
|
|
// doInsertValue - This is a small helper function to be called only
|
|
// be insertValue.
|
|
//
|
|
int SlotCalculator::doInsertValue(const Value *D) {
|
|
const Type *Typ = D->getType();
|
|
unsigned Ty;
|
|
|
|
// Used for debugging DefSlot=-1 assertion...
|
|
//if (Typ == Type::TypeTy)
|
|
// cerr << "Inserting type '" << cast<Type>(D)->getDescription() << "'!\n";
|
|
|
|
if (Typ->isDerivedType()) {
|
|
int ValSlot;
|
|
if (CompactionTable.empty())
|
|
ValSlot = getSlot(Typ);
|
|
else
|
|
ValSlot = getGlobalSlot(Typ);
|
|
if (ValSlot == -1) { // Have we already entered this type?
|
|
// Nope, this is the first we have seen the type, process it.
|
|
ValSlot = insertValue(Typ, true);
|
|
assert(ValSlot != -1 && "ProcessType returned -1 for a type?");
|
|
}
|
|
Ty = (unsigned)ValSlot;
|
|
} else {
|
|
Ty = Typ->getPrimitiveID();
|
|
}
|
|
|
|
if (Table.size() <= Ty) // Make sure we have the type plane allocated...
|
|
Table.resize(Ty+1, TypePlane());
|
|
|
|
// If this is the first value to get inserted into the type plane, make sure
|
|
// to insert the implicit null value...
|
|
if (Table[Ty].empty() && BuildBytecodeInfo && hasNullValue(Ty)) {
|
|
Value *ZeroInitializer = Constant::getNullValue(Typ);
|
|
|
|
// If we are pushing zeroinit, it will be handled below.
|
|
if (D != ZeroInitializer) {
|
|
Table[Ty].push_back(ZeroInitializer);
|
|
NodeMap[ZeroInitializer] = 0;
|
|
}
|
|
}
|
|
|
|
// Insert node into table and NodeMap...
|
|
unsigned DestSlot = NodeMap[D] = Table[Ty].size();
|
|
Table[Ty].push_back(D);
|
|
|
|
SC_DEBUG(" Inserting value [" << Ty << "] = " << D << " slot=" <<
|
|
DestSlot << " [");
|
|
// G = Global, C = Constant, T = Type, F = Function, o = other
|
|
SC_DEBUG((isa<GlobalVariable>(D) ? "G" : (isa<Constant>(D) ? "C" :
|
|
(isa<Type>(D) ? "T" : (isa<Function>(D) ? "F" : "o")))));
|
|
SC_DEBUG("]\n");
|
|
return (int)DestSlot;
|
|
}
|