Source code
Revision control
Copy as Markdown
Other Tools
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#define ANNOTATE(property) __attribute__((annotate(property)))
struct Cell {
int f;
} ANNOTATE("GC Thing");
class AutoSuppressGC_Base {
public:
AutoSuppressGC_Base() {}
~AutoSuppressGC_Base() {}
} ANNOTATE("Suppress GC");
class AutoSuppressGC_Child : public AutoSuppressGC_Base {
public:
AutoSuppressGC_Child() : AutoSuppressGC_Base() {}
};
class AutoSuppressGC {
AutoSuppressGC_Child helpImBeingSuppressed;
public:
AutoSuppressGC() {}
};
extern void GC() ANNOTATE("GC Call");
void GC() {
// If the implementation is too trivial, the function body won't be emitted at
// all.
asm("");
}
extern void foo(Cell*);
void suppressedFunction() {
GC(); // Calls GC, but is always called within AutoSuppressGC
}
void halfSuppressedFunction() {
GC(); // Calls GC, but is sometimes called within AutoSuppressGC
}
void unsuppressedFunction() {
GC(); // Calls GC, never within AutoSuppressGC
}
void f() {
Cell* cell1 = nullptr;
Cell* cell2 = nullptr;
Cell* cell3 = nullptr;
{
AutoSuppressGC nogc;
suppressedFunction();
halfSuppressedFunction();
}
foo(cell1);
halfSuppressedFunction();
foo(cell2);
unsuppressedFunction();
{
// Old bug: it would look from the first AutoSuppressGC constructor it
// found to the last destructor. This statement *should* have no effect.
AutoSuppressGC nogc;
}
foo(cell3);
}