mirror of
https://github.com/c64scene-ar/llvm-6502.git
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5efec28901
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@657 91177308-0d34-0410-b5e6-96231b3b80d8
156 lines
4.8 KiB
C++
156 lines
4.8 KiB
C++
//===-- Value.cpp - Implement the Value class -----------------------------===//
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//
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// This file implements the Value, User, and SymTabValue classes.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ValueHolderImpl.h"
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#include "llvm/InstrTypes.h"
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#include "llvm/SymbolTable.h"
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#include "llvm/SymTabValue.h"
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#include "llvm/ConstPoolVals.h"
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#include "llvm/Type.h"
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#ifndef NDEBUG // Only in -g mode...
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#include "llvm/Assembly/Writer.h"
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#endif
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#include <algorithm>
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//===----------------------------------------------------------------------===//
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// Value Class
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//===----------------------------------------------------------------------===//
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Value::Value(const Type *ty, ValueTy vty, const string &name = "")
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: Name(name), Ty(ty, this) {
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VTy = vty;
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}
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Value::~Value() {
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#ifndef NDEBUG // Only in -g mode...
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// Check to make sure that there are no uses of this value that are still
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// around when the value is destroyed. If there are, then we have a dangling
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// reference and something is wrong. This code is here to print out what is
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// still being referenced. The value in question should be printed as
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// a <badref>
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//
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if (Uses.begin() != Uses.end()) {
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cerr << "While deleting: " << this;
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for (use_const_iterator I = Uses.begin(); I != Uses.end(); ++I)
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cerr << "Use still stuck around after Def is destroyed:" << *I << endl;
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}
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#endif
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assert(Uses.begin() == Uses.end());
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}
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void Value::replaceAllUsesWith(Value *D) {
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assert(D && "Value::replaceAllUsesWith(<null>) is invalid!");
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assert(D != this && "V->replaceAllUsesWith(V) is NOT valid!");
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while (!Uses.empty()) {
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User *Use = Uses.back();
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#ifndef NDEBUG
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unsigned NumUses = Uses.size();
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#endif
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Use->replaceUsesOfWith(this, D);
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#ifndef NDEBUG // only in -g mode...
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if (Uses.size() == NumUses)
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cerr << "Use: " << Use << "replace with: " << D;
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#endif
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assert(Uses.size() != NumUses && "Didn't remove definition!");
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}
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}
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// refineAbstractType - This function is implemented because we use
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// potentially abstract types, and these types may be resolved to more
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// concrete types after we are constructed. For the value class, we simply
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// change Ty to point to the right type. :)
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//
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void Value::refineAbstractType(const DerivedType *OldTy, const Type *NewTy) {
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assert(Ty.get() == (const Type*)OldTy &&"Can't refine anything but my type!");
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Ty = NewTy;
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}
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void Value::killUse(User *i) {
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if (i == 0) return;
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use_iterator I = find(Uses.begin(), Uses.end(), i);
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assert(I != Uses.end() && "Use not in uses list!!");
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Uses.erase(I);
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}
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User *Value::use_remove(use_iterator &I) {
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assert(I != Uses.end() && "Trying to remove the end of the use list!!!");
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User *i = *I;
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I = Uses.erase(I);
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return i;
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}
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#ifndef NDEBUG // Only in -g mode...
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void Value::dump() const {
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cerr << this;
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}
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#endif
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//===----------------------------------------------------------------------===//
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// User Class
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//===----------------------------------------------------------------------===//
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User::User(const Type *Ty, ValueTy vty, const string &name)
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: Value(Ty, vty, name) {
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}
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// replaceUsesOfWith - Replaces all references to the "From" definition with
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// references to the "To" definition.
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//
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void User::replaceUsesOfWith(Value *From, Value *To) {
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if (From == To) return; // Duh what?
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for (unsigned i = 0, E = getNumOperands(); i != E; ++i)
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if (getOperand(i) == From) { // Is This operand is pointing to oldval?
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// The side effects of this setOperand call include linking to
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// "To", adding "this" to the uses list of To, and
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// most importantly, removing "this" from the use list of "From".
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setOperand(i, To); // Fix it now...
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}
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}
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//===----------------------------------------------------------------------===//
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// SymTabValue Class
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//===----------------------------------------------------------------------===//
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SymTabValue::SymTabValue(Value *p) : ValueParent(p) {
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assert(ValueParent && "SymTavValue without parent!?!");
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ParentSymTab = SymTab = 0;
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}
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SymTabValue::~SymTabValue() {
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delete SymTab;
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}
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void SymTabValue::setParentSymTab(SymbolTable *ST) {
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ParentSymTab = ST;
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if (SymTab)
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SymTab->setParentSymTab(ST);
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}
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SymbolTable *SymTabValue::getSymbolTableSure() {
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if (!SymTab) SymTab = new SymbolTable(ParentSymTab);
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return SymTab;
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}
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// hasSymbolTable() - Returns true if there is a symbol table allocated to
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// this object AND if there is at least one name in it!
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//
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bool SymTabValue::hasSymbolTable() const {
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if (!SymTab) return false;
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for (SymbolTable::const_iterator I = SymTab->begin();
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I != SymTab->end(); ++I) {
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if (I->second.begin() != I->second.end())
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return true; // Found nonempty type plane!
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}
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return false;
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}
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