Magic-Mirror/llvm-capstone
1
0
Fork 0
mirror of https://github.com/capstone-engine/llvm-capstone.git synced 2024-11-27 23:51:56 +00:00
Code Issues Actions 2 Packages Projects Releases Wiki Activity

Notes on dynamic array cookies in MSVC.

Browse Source 
My thanks to chapuni for his help in investigating this.

llvm-svn: 124351
This commit is contained in:
John McCall 2011-01-27 02:46:02 +00:00
parent a148c59231
commit 2903675929
1 changed files with 23 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
clang/lib/CodeGen/MicrosoftCXXABI.cpp
View File

@ -55,6 +55,29 @@ public:
EmitThisParam(CGF);
// TODO: 'for base' flag
}
// ==== Notes on array cookies =========
//
// MSVC seems to only use cookies when the class has a destructor; a
// two-argument usual array deallocation function isn't sufficient.
//
// For example, this code prints "100" and "1":
// struct A {
// char x;
// void *operator new[](size_t sz) {
// printf("%u\n", sz);
// return malloc(sz);
// }
// void operator delete[](void *p, size_t sz) {
// printf("%u\n", sz);
// free(p);
// }
// };
// int main() {
// A *p = new A[100];
// delete[] p;
// }
// Whereas it prints "104" and "104" if you give A a destructor.
};
}