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Update obsolete comments

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Fix iterator invalidation problems which was causing -mstrip to miss some
entries, and read free'd memory.  This shrinks the symbol table of 254.gap
from 333 to 284 bytes!  :)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10751 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-01-10 21:36:49 +00:00
parent 737d3cd719
commit 2cacc0a306
1 changed files with 9 additions and 6 deletions
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15
lib/Transforms/Scalar/SymbolStripping.cpp
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@ -10,9 +10,9 @@
// This file implements stripping symbols out of symbol tables. // This file implements stripping symbols out of symbol tables.
// //
// Specifically, this allows you to strip all of the symbols out of: // Specifically, this allows you to strip all of the symbols out of:
// * A function
// * All functions in a module // * All functions in a module
// * All symbols in a module (all function symbols + all module scope symbols) // * All non-essential symbols in a module (all function symbols + all module
// scope symbols)
// //
// Notice that: // Notice that:
// * This pass makes code much less readable, so it should only be used in // * This pass makes code much less readable, so it should only be used in
@ -30,12 +30,15 @@ using namespace llvm;
static bool StripSymbolTable(SymbolTable &SymTab) { static bool StripSymbolTable(SymbolTable &SymTab) {
bool RemovedSymbol = false; bool RemovedSymbol = false;
for (SymbolTable::iterator I = SymTab.begin(); I != SymTab.end(); ++I) { for (SymbolTable::iterator I = SymTab.begin(); I != SymTab.end();) {
std::map<const std::string, Value *> &Plane = I->second; // Removing items from the plane can cause the plane itself to get deleted.
// If this happens, make sure we incremented our plane iterator already!
std::map<const std::string, Value *> &Plane = (I++)->second;
SymbolTable::type_iterator B = Plane.begin(); SymbolTable::type_iterator B = Plane.begin(), Bend = Plane.end();
while (B != Plane.end()) { // Found nonempty type plane! while (B != Bend) { // Found nonempty type plane!
Value *V = B->second; Value *V = B->second;
if (isa<Constant>(V) || isa<Type>(V)) { if (isa<Constant>(V) || isa<Type>(V)) {
SymTab.type_remove(B++); SymTab.type_remove(B++);
RemovedSymbol = true; RemovedSymbol = true;