Hi,
Sorry overlooked, thanks for pointing it out!
I hope this is what we want.
Vassil
diff --git a/lib/Lex/PPDirectives.cpp b/lib/Lex/PPDirectives.cpp
index 5f38387..000ea7a 100644
--- a/lib/Lex/PPDirectives.cpp
+++ b/lib/Lex/PPDirectives.cpp
@@ -94,6 +94,19 @@
Preprocessor::AllocateVisibilityMacroDirective(SourceLocation Loc,
/// error in the macro definition.
void Preprocessor::ReleaseMacroInfo(MacroInfo *MI) {
// Don't try to reuse the storage; this only happens on error paths.
+
+ // If this is on the macro info chain, avoid double deletion on teardown.
+ MacroInfoChain *current = MIChainHead;
+ while (MacroInfoChain *I = current) {
+ if (&(I->MI) == MI) {
+ I->Next = (I->Next) ? I->Next->Next : 0;
+ if (I == MIChainHead)
+ MIChainHead = I;
+ break;
+ }
+ current = I->Next;
+ }
+
MI->~MacroInfo();
}
On 03/08/14 20:28, Yaron Keren wrote:
Hi,
MIChainHead is a pointer to the head of a linked list
of MacroInfoChain nodes, each containing a MacroInfo and MacroInfoChain*.
Why does the while loop modify MIChainHead on every iteration?
MIChainHead should be modified only if it points to the node
containing the removed MacroInfo MI. In all other cases it should not
change.
As it is now, the loop will always terminate with MIChainHead == nullptr.
Yaron
2014-08-03 21:10 GMT+03:00 Vassil Vassilev <[email protected]
<mailto:[email protected]>>:
Hi Yaron,
Yes I meant double destruction.
Vassil
On 03/08/14 20:08, Yaron Keren wrote:
Hi Vassil,
Do you mean double destruction (not deletion) of MacroInfo first
time in ReleaseMacroInfo and the second time in ~Preprocessor via
~MacroInfoChain?
while (MacroInfoChain *I = MIChainHead) {
MIChainHead = I->Next;
I->~MacroInfoChain();
}
or something else?
Yaron
2014-08-02 23:05 GMT+03:00 Vassil Vassilev <[email protected]
<mailto:[email protected]>>:
Hi,
In cases where ReleaseMacroInfo gets called and it doesn't
cleanup the Preprocessor's MIChainHead can lead to double
deletion. I am sending the patch that fixes the problem for me.
Vassil
diff --git a/lib/Lex/PPDirectives.cpp b/lib/Lex/PPDirectives.cpp
index 5f38387..1a9b5eb 100644
--- a/lib/Lex/PPDirectives.cpp
+++ b/lib/Lex/PPDirectives.cpp
@@ -94,6 +94,14 @@
Preprocessor::AllocateVisibilityMacroDirective(SourceLocation
Loc,
/// error in the macro definition.
void Preprocessor::ReleaseMacroInfo(MacroInfo *MI) {
// Don't try to reuse the storage; this only happens on
error paths.
+
+ // If this is on the macro info chain, avoid double
deletion on teardown.
+ while (MacroInfoChain *I = MIChainHead) {
+ if (&(I->MI) == MI)
+ I->Next = (I->Next) ? I->Next->Next : 0;
+ MIChainHead = I->Next;
+ }
+
MI->~MacroInfo();
}
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