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More symbol table bugfixes that are impossible to track down. Goody

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@960 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2001-10-23 02:32:45 +00:00
parent 5855f0db2a
commit e638c10cb0
2 changed files with 38 additions and 35 deletions
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19
include/llvm/SymbolTable.h
View File

@ -24,13 +24,8 @@
#include "llvm/ConstPoolVals.h" #include "llvm/ConstPoolVals.h"
#endif #endif
class Value;
class Type; class Type;
// TODO: Change this back to vector<map<const string, Value *> >
// Make the vector be a data member, and base it on UniqueID's
// That should be much more efficient!
//
class SymbolTable : public AbstractTypeUser, class SymbolTable : public AbstractTypeUser,
public map<const Type *, map<const string, Value *> > { public map<const Type *, map<const string, Value *> > {
public: public:
@ -47,7 +42,10 @@ public:
typedef VarMap::iterator type_iterator; typedef VarMap::iterator type_iterator;
typedef VarMap::const_iterator type_const_iterator; typedef VarMap::const_iterator type_const_iterator;
inline SymbolTable(SymbolTable *P = 0) { ParentSymTab = P; } inline SymbolTable(SymbolTable *P = 0) {
ParentSymTab = P;
InternallyInconsistent = false;
}
~SymbolTable(); ~SymbolTable();
SymbolTable *getParentSymTab() { return ParentSymTab; } SymbolTable *getParentSymTab() { return ParentSymTab; }
@ -106,6 +104,15 @@ public:
void dump() const; // Debug method, print out symbol table void dump() const; // Debug method, print out symbol table
private: private:
// InternallyInconsistent - There are times when the symbol table is
// internally inconsistent with the rest of the program. In this one case, a
// value exists with a Name, and it's not in the symbol table. When we call
// V->setName(""), it tries to remove itself from the symbol table and dies.
// We know this is happening, and so if the flag InternallyInconsistent is
// set, removal from the symbol table is a noop.
//
bool InternallyInconsistent;
inline super::value_type operator[](const Type *Ty) { inline super::value_type operator[](const Type *Ty) {
assert(0 && "Should not use this operator to access symbol table!"); assert(0 && "Should not use this operator to access symbol table!");
return super::value_type(); return super::value_type();

26
lib/VMCore/SymbolTable.cpp
View File

@ -80,6 +80,7 @@ void SymbolTable::remove(Value *N) {
// removeEntry - Remove a value from the symbol table... // removeEntry - Remove a value from the symbol table...
// //
Value *SymbolTable::removeEntry(iterator Plane, type_iterator Entry) { Value *SymbolTable::removeEntry(iterator Plane, type_iterator Entry) {
if (InternallyInconsistent) return 0;
assert(Plane != super::end() && assert(Plane != super::end() &&
Entry != Plane->second.end() && "Invalid entry to remove!"); Entry != Plane->second.end() && "Invalid entry to remove!");
@ -206,9 +207,10 @@ void SymbolTable::refineAbstractType(const DerivedType *OldType,
// The only thing we are allowing for now is two method prototypes being // The only thing we are allowing for now is two method prototypes being
// folded into one. // folded into one.
// //
if (Method *ExistM = dyn_cast<Method>(TI->second)) Method *ExistM = dyn_cast<Method>(TI->second);
if (Method *NewM = dyn_cast<Method>(V.second)) Method *NewM = dyn_cast<Method>(V.second);
if (ExistM->isExternal() && NewM->isExternal()) {
if (ExistM && NewM && ExistM->isExternal() && NewM->isExternal()) {
// Ok we have two external methods. Make all uses of the new one // Ok we have two external methods. Make all uses of the new one
// use the old one... // use the old one...
// //
@ -218,25 +220,19 @@ void SymbolTable::refineAbstractType(const DerivedType *OldType,
// added to our symbol table. The problem is that if we call // added to our symbol table. The problem is that if we call
// setName on the method that it will try to remove itself from // setName on the method that it will try to remove itself from
// the symbol table and die... because it's not in the symtab // the symbol table and die... because it's not in the symtab
// right now. To fix this, we temporarily insert it (by setting // right now. To fix this, we have an internally consistent flag
// TI's entry to the old value. Then after it is removed, we // that turns remove into a noop. Thus the name will get null'd
// restore ExistM into the symbol table. // out, but the symbol table won't get upset.
// //
if (NewM->getType() == NewType) { InternallyInconsistent = true;
TI->second = NewM; // Add newM to the symtab
// Remove newM from the symtab // Remove newM from the symtab
NewM->setName(""); NewM->setName("");
InternallyInconsistent = false;
// Readd ExistM to the symbol table....
NewPlane.insert(make_pair(V.first, ExistM));
} else { } else {
NewM->setName("");
}
continue;
}
assert(0 && "Two ploanes folded together with overlapping " assert(0 && "Two ploanes folded together with overlapping "
"value names!"); "value names!");
}
} else { } else {
insertEntry(V.first, NewType, V.second); insertEntry(V.first, NewType, V.second);