mirror of
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137fa92dce
because the slot calculator is already part of the VMCore library. * Rename incorporateMethod and purgeMethod to *Function llvm-svn: 2154
531 lines
17 KiB
C++
531 lines
17 KiB
C++
//===-- ConstantVals.cpp - Implement Constant nodes --------------*- C++ -*--=//
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//
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// This file implements the Constant* classes...
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//
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//===----------------------------------------------------------------------===//
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#define __STDC_LIMIT_MACROS // Get defs for INT64_MAX and friends...
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#include "llvm/ConstantVals.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/SymbolTable.h"
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#include "llvm/GlobalValue.h"
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#include "llvm/Module.h"
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#include "llvm/SlotCalculator.h"
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#include "Support/StringExtras.h"
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#include <algorithm>
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using std::map;
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using std::pair;
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using std::make_pair;
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ConstantBool *ConstantBool::True = new ConstantBool(true);
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ConstantBool *ConstantBool::False = new ConstantBool(false);
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//===----------------------------------------------------------------------===//
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// Constant Class
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//===----------------------------------------------------------------------===//
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// Specialize setName to take care of symbol table majik
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void Constant::setName(const std::string &Name, SymbolTable *ST) {
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assert(ST && "Type::setName - Must provide symbol table argument!");
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if (Name.size()) ST->insert(Name, this);
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}
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// Static constructor to create a '0' constant of arbitrary type...
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Constant *Constant::getNullConstant(const Type *Ty) {
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switch (Ty->getPrimitiveID()) {
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case Type::BoolTyID: return ConstantBool::get(false);
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case Type::SByteTyID:
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case Type::ShortTyID:
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case Type::IntTyID:
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case Type::LongTyID: return ConstantSInt::get(Ty, 0);
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case Type::UByteTyID:
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case Type::UShortTyID:
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case Type::UIntTyID:
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case Type::ULongTyID: return ConstantUInt::get(Ty, 0);
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case Type::FloatTyID:
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case Type::DoubleTyID: return ConstantFP::get(Ty, 0);
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case Type::PointerTyID:
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return ConstantPointerNull::get(cast<PointerType>(Ty));
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default:
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return 0;
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}
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}
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void Constant::destroyConstantImpl() {
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// When a Constant is destroyed, there may be lingering
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// references to the constant by other constants in the constant pool. These
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// constants are implicitly dependant on the module that is being deleted,
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// but they don't know that. Because we only find out when the CPV is
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// deleted, we must now notify all of our users (that should only be
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// Constants) that they are, in fact, invalid now and should be deleted.
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//
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while (!use_empty()) {
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Value *V = use_back();
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#ifndef NDEBUG // Only in -g mode...
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if (!isa<Constant>(V)) {
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std::cerr << "While deleting: ";
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dump();
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std::cerr << "\nUse still stuck around after Def is destroyed: ";
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V->dump();
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std::cerr << "\n";
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}
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#endif
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assert(isa<Constant>(V) && "References remain to ConstantPointerRef!");
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Constant *CPV = cast<Constant>(V);
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CPV->destroyConstant();
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// The constant should remove itself from our use list...
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assert((use_empty() || use_back() == V) && "Constant not removed!");
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}
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// Value has no outstanding references it is safe to delete it now...
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delete this;
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}
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//===----------------------------------------------------------------------===//
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// ConstantXXX Classes
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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// Normal Constructors
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ConstantBool::ConstantBool(bool V) : Constant(Type::BoolTy) {
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Val = V;
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}
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ConstantInt::ConstantInt(const Type *Ty, uint64_t V) : Constant(Ty) {
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Val.Unsigned = V;
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}
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ConstantSInt::ConstantSInt(const Type *Ty, int64_t V) : ConstantInt(Ty, V) {
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assert(isValueValidForType(Ty, V) && "Value too large for type!");
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}
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ConstantUInt::ConstantUInt(const Type *Ty, uint64_t V) : ConstantInt(Ty, V) {
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assert(isValueValidForType(Ty, V) && "Value too large for type!");
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}
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ConstantFP::ConstantFP(const Type *Ty, double V) : Constant(Ty) {
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assert(isValueValidForType(Ty, V) && "Value too large for type!");
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Val = V;
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}
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ConstantArray::ConstantArray(const ArrayType *T,
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const std::vector<Constant*> &V) : Constant(T) {
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for (unsigned i = 0; i < V.size(); i++) {
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assert(V[i]->getType() == T->getElementType());
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Operands.push_back(Use(V[i], this));
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}
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}
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ConstantStruct::ConstantStruct(const StructType *T,
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const std::vector<Constant*> &V) : Constant(T) {
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const StructType::ElementTypes &ETypes = T->getElementTypes();
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for (unsigned i = 0; i < V.size(); i++) {
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assert(V[i]->getType() == ETypes[i]);
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Operands.push_back(Use(V[i], this));
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}
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}
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ConstantPointerRef::ConstantPointerRef(GlobalValue *GV)
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: ConstantPointer(GV->getType()) {
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Operands.push_back(Use(GV, this));
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}
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//===----------------------------------------------------------------------===//
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// getStrValue implementations
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std::string ConstantBool::getStrValue() const {
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return Val ? "true" : "false";
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}
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std::string ConstantSInt::getStrValue() const {
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return itostr(Val.Signed);
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}
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std::string ConstantUInt::getStrValue() const {
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return utostr(Val.Unsigned);
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}
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// ConstantFP::getStrValue - We would like to output the FP constant value in
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// exponential notation, but we cannot do this if doing so will lose precision.
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// Check here to make sure that we only output it in exponential format if we
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// can parse the value back and get the same value.
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//
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std::string ConstantFP::getStrValue() const {
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std::string StrVal = ftostr(Val);
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// Check to make sure that the stringized number is not some string like "Inf"
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// or NaN, that atof will accept, but the lexer will not. Check that the
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// string matches the "[-+]?[0-9]" regex.
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//
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if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
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((StrVal[0] == '-' || StrVal[0] == '+') &&
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(StrVal[0] >= '0' && StrVal[0] <= '9'))) {
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double TestVal = atof(StrVal.c_str()); // Reparse stringized version!
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if (TestVal == Val)
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return StrVal;
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}
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// Otherwise we could not reparse it to exactly the same value, so we must
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// output the string in hexadecimal format!
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//
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// Behave nicely in the face of C TBAA rules... see:
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// http://www.nullstone.com/htmls/category/aliastyp.htm
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//
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char *Ptr = (char*)&Val;
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assert(sizeof(double) == sizeof(uint64_t) && sizeof(double) == 8 &&
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"assuming that double is 64 bits!");
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return "0x"+utohexstr(*(uint64_t*)Ptr);
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}
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std::string ConstantArray::getStrValue() const {
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std::string Result;
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// As a special case, print the array as a string if it is an array of
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// ubytes or an array of sbytes with positive values.
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//
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const Type *ETy = cast<ArrayType>(getType())->getElementType();
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bool isString = (ETy == Type::SByteTy || ETy == Type::UByteTy);
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if (ETy == Type::SByteTy) {
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for (unsigned i = 0; i < Operands.size(); ++i)
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if (ETy == Type::SByteTy &&
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cast<ConstantSInt>(Operands[i])->getValue() < 0) {
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isString = false;
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break;
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}
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}
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if (isString) {
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Result = "c\"";
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for (unsigned i = 0; i < Operands.size(); ++i) {
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unsigned char C = (ETy == Type::SByteTy) ?
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(unsigned char)cast<ConstantSInt>(Operands[i])->getValue() :
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(unsigned char)cast<ConstantUInt>(Operands[i])->getValue();
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if (isprint(C)) {
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Result += C;
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} else {
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Result += '\\';
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Result += ( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A');
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Result += ((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A');
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}
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}
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Result += "\"";
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} else {
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Result = "[";
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if (Operands.size()) {
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Result += " " + Operands[0]->getType()->getDescription() +
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" " + cast<Constant>(Operands[0])->getStrValue();
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for (unsigned i = 1; i < Operands.size(); i++)
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Result += ", " + Operands[i]->getType()->getDescription() +
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" " + cast<Constant>(Operands[i])->getStrValue();
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}
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Result += " ]";
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}
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return Result;
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}
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std::string ConstantStruct::getStrValue() const {
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std::string Result = "{";
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if (Operands.size()) {
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Result += " " + Operands[0]->getType()->getDescription() +
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" " + cast<Constant>(Operands[0])->getStrValue();
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for (unsigned i = 1; i < Operands.size(); i++)
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Result += ", " + Operands[i]->getType()->getDescription() +
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" " + cast<Constant>(Operands[i])->getStrValue();
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}
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return Result + " }";
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}
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std::string ConstantPointerNull::getStrValue() const {
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return "null";
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}
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std::string ConstantPointerRef::getStrValue() const {
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const GlobalValue *V = getValue();
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if (V->hasName()) return "%" + V->getName();
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// FIXME: This is a gross hack.
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SlotCalculator *Table = new SlotCalculator(V->getParent(), true);
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int Slot = Table->getValSlot(V);
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delete Table;
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if (Slot >= 0) return std::string(" %") + itostr(Slot);
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else return "<pointer reference badref>";
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}
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//===----------------------------------------------------------------------===//
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// classof implementations
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bool ConstantInt::classof(const Constant *CPV) {
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return CPV->getType()->isIntegral();
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}
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bool ConstantSInt::classof(const Constant *CPV) {
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return CPV->getType()->isSigned();
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}
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bool ConstantUInt::classof(const Constant *CPV) {
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return CPV->getType()->isUnsigned();
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}
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bool ConstantFP::classof(const Constant *CPV) {
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const Type *Ty = CPV->getType();
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return Ty == Type::FloatTy || Ty == Type::DoubleTy;
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}
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bool ConstantArray::classof(const Constant *CPV) {
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return isa<ArrayType>(CPV->getType());
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}
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bool ConstantStruct::classof(const Constant *CPV) {
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return isa<StructType>(CPV->getType());
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}
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bool ConstantPointer::classof(const Constant *CPV) {
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return isa<PointerType>(CPV->getType());
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}
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//===----------------------------------------------------------------------===//
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// isValueValidForType implementations
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bool ConstantSInt::isValueValidForType(const Type *Ty, int64_t Val) {
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switch (Ty->getPrimitiveID()) {
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default:
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return false; // These can't be represented as integers!!!
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// Signed types...
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case Type::SByteTyID:
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return (Val <= INT8_MAX && Val >= INT8_MIN);
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case Type::ShortTyID:
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return (Val <= INT16_MAX && Val >= INT16_MIN);
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case Type::IntTyID:
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return (Val <= INT32_MAX && Val >= INT32_MIN);
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case Type::LongTyID:
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return true; // This is the largest type...
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}
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assert(0 && "WTF?");
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return false;
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}
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bool ConstantUInt::isValueValidForType(const Type *Ty, uint64_t Val) {
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switch (Ty->getPrimitiveID()) {
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default:
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return false; // These can't be represented as integers!!!
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// Unsigned types...
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case Type::UByteTyID:
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return (Val <= UINT8_MAX);
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case Type::UShortTyID:
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return (Val <= UINT16_MAX);
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case Type::UIntTyID:
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return (Val <= UINT32_MAX);
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case Type::ULongTyID:
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return true; // This is the largest type...
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}
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assert(0 && "WTF?");
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return false;
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}
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bool ConstantFP::isValueValidForType(const Type *Ty, double Val) {
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switch (Ty->getPrimitiveID()) {
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default:
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return false; // These can't be represented as floating point!
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// TODO: Figure out how to test if a double can be cast to a float!
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case Type::FloatTyID:
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/*
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return (Val <= UINT8_MAX);
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*/
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case Type::DoubleTyID:
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return true; // This is the largest type...
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}
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};
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//===----------------------------------------------------------------------===//
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// Hash Function Implementations
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#if 0
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unsigned ConstantSInt::hash(const Type *Ty, int64_t V) {
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return unsigned(Ty->getPrimitiveID() ^ V);
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}
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unsigned ConstantUInt::hash(const Type *Ty, uint64_t V) {
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return unsigned(Ty->getPrimitiveID() ^ V);
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}
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unsigned ConstantFP::hash(const Type *Ty, double V) {
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return Ty->getPrimitiveID() ^ unsigned(V);
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}
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unsigned ConstantArray::hash(const ArrayType *Ty,
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const std::vector<Constant*> &V) {
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unsigned Result = (Ty->getUniqueID() << 5) ^ (Ty->getUniqueID() * 7);
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for (unsigned i = 0; i < V.size(); ++i)
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Result ^= V[i]->getHash() << (i & 7);
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return Result;
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}
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unsigned ConstantStruct::hash(const StructType *Ty,
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const std::vector<Constant*> &V) {
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unsigned Result = (Ty->getUniqueID() << 5) ^ (Ty->getUniqueID() * 7);
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for (unsigned i = 0; i < V.size(); ++i)
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Result ^= V[i]->getHash() << (i & 7);
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return Result;
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}
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#endif
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//===----------------------------------------------------------------------===//
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// Factory Function Implementation
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template<class ValType, class ConstantClass>
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struct ValueMap {
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typedef pair<const Type*, ValType> ConstHashKey;
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map<ConstHashKey, ConstantClass *> Map;
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inline ConstantClass *get(const Type *Ty, ValType V) {
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map<ConstHashKey,ConstantClass *>::iterator I =
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Map.find(ConstHashKey(Ty, V));
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return (I != Map.end()) ? I->second : 0;
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}
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inline void add(const Type *Ty, ValType V, ConstantClass *CP) {
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Map.insert(make_pair(ConstHashKey(Ty, V), CP));
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}
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inline void remove(ConstantClass *CP) {
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for (map<ConstHashKey,ConstantClass *>::iterator I = Map.begin(),
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E = Map.end(); I != E;++I)
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if (I->second == CP) {
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Map.erase(I);
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return;
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}
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}
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};
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//---- ConstantUInt::get() and ConstantSInt::get() implementations...
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//
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static ValueMap<uint64_t, ConstantInt> IntConstants;
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ConstantSInt *ConstantSInt::get(const Type *Ty, int64_t V) {
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ConstantSInt *Result = (ConstantSInt*)IntConstants.get(Ty, (uint64_t)V);
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if (!Result) // If no preexisting value, create one now...
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IntConstants.add(Ty, V, Result = new ConstantSInt(Ty, V));
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return Result;
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}
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ConstantUInt *ConstantUInt::get(const Type *Ty, uint64_t V) {
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ConstantUInt *Result = (ConstantUInt*)IntConstants.get(Ty, V);
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if (!Result) // If no preexisting value, create one now...
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IntConstants.add(Ty, V, Result = new ConstantUInt(Ty, V));
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return Result;
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}
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ConstantInt *ConstantInt::get(const Type *Ty, unsigned char V) {
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assert(V <= 127 && "Can only be used with very small positive constants!");
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if (Ty->isSigned()) return ConstantSInt::get(Ty, V);
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return ConstantUInt::get(Ty, V);
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}
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//---- ConstantFP::get() implementation...
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//
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static ValueMap<double, ConstantFP> FPConstants;
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ConstantFP *ConstantFP::get(const Type *Ty, double V) {
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ConstantFP *Result = FPConstants.get(Ty, V);
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if (!Result) // If no preexisting value, create one now...
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FPConstants.add(Ty, V, Result = new ConstantFP(Ty, V));
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return Result;
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}
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//---- ConstantArray::get() implementation...
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//
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static ValueMap<std::vector<Constant*>, ConstantArray> ArrayConstants;
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ConstantArray *ConstantArray::get(const ArrayType *Ty,
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const std::vector<Constant*> &V) {
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ConstantArray *Result = ArrayConstants.get(Ty, V);
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if (!Result) // If no preexisting value, create one now...
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ArrayConstants.add(Ty, V, Result = new ConstantArray(Ty, V));
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return Result;
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}
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// ConstantArray::get(const string&) - Return an array that is initialized to
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// contain the specified string. A null terminator is added to the specified
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// string so that it may be used in a natural way...
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//
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ConstantArray *ConstantArray::get(const std::string &Str) {
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std::vector<Constant*> ElementVals;
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for (unsigned i = 0; i < Str.length(); ++i)
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ElementVals.push_back(ConstantSInt::get(Type::SByteTy, Str[i]));
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// Add a null terminator to the string...
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ElementVals.push_back(ConstantSInt::get(Type::SByteTy, 0));
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ArrayType *ATy = ArrayType::get(Type::SByteTy, Str.length()+1);
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return ConstantArray::get(ATy, ElementVals);
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}
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// destroyConstant - Remove the constant from the constant table...
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//
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void ConstantArray::destroyConstant() {
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ArrayConstants.remove(this);
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destroyConstantImpl();
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}
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//---- ConstantStruct::get() implementation...
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//
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static ValueMap<std::vector<Constant*>, ConstantStruct> StructConstants;
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ConstantStruct *ConstantStruct::get(const StructType *Ty,
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const std::vector<Constant*> &V) {
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ConstantStruct *Result = StructConstants.get(Ty, V);
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if (!Result) // If no preexisting value, create one now...
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StructConstants.add(Ty, V, Result = new ConstantStruct(Ty, V));
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return Result;
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}
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// destroyConstant - Remove the constant from the constant table...
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//
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void ConstantStruct::destroyConstant() {
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StructConstants.remove(this);
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destroyConstantImpl();
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}
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//---- ConstantPointerNull::get() implementation...
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//
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static ValueMap<char, ConstantPointerNull> NullPtrConstants;
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ConstantPointerNull *ConstantPointerNull::get(const PointerType *Ty) {
|
|
ConstantPointerNull *Result = NullPtrConstants.get(Ty, 0);
|
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if (!Result) // If no preexisting value, create one now...
|
|
NullPtrConstants.add(Ty, 0, Result = new ConstantPointerNull(Ty));
|
|
return Result;
|
|
}
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|
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//---- ConstantPointerRef::get() implementation...
|
|
//
|
|
ConstantPointerRef *ConstantPointerRef::get(GlobalValue *GV) {
|
|
assert(GV->getParent() && "Global Value must be attached to a module!");
|
|
|
|
// The Module handles the pointer reference sharing...
|
|
return GV->getParent()->getConstantPointerRef(GV);
|
|
}
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|
|
|
|
|
void ConstantPointerRef::mutateReference(GlobalValue *NewGV) {
|
|
getValue()->getParent()->mutateConstantPointerRef(getValue(), NewGV);
|
|
Operands[0] = NewGV;
|
|
}
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