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/*===- crtend.c - Initialization code for programs ------------------------===*\
*
* This file defines the __main function, which is used to run static
* constructors and destructors in C++ programs, or with C programs that use GCC
* extensions to accomplish the same effect.
*
* The main data structures used to implement this functionality is the
* llvm.global_ctors and llvm.global_dtors lists, which are null terminated
* lists of TorRec (defined below) structures.
*
\*===----------------------------------------------------------------------===*/
#include <stdlib.h>
/* TorRec - The record type for each element of the ctor/dtor list */
typedef struct TorRec {
int Priority;
void (*FP)(void);
} TorRec;
/* __llvm_getGlobalCtors, __llvm_getGlobalDtors - Interface to the LLVM
* listend.ll file to get access to the start of the ctor and dtor lists...
*/
TorRec *__llvm_getGlobalCtors(void);
TorRec *__llvm_getGlobalDtors(void);
static void run_destructors(void);
/* __main - A call to this function is automatically inserted into the top of
* the "main" function in the program compiled. This function is responsible
* for calling static constructors before the program starts executing.
*/
void __main(void) {
/* Loop over all of the constructor records, calling each function pointer. */
TorRec *R = __llvm_getGlobalCtors();
/* Recursively calling main is not legal C, but lots of people do it for
* testing stuff. We might as well work for them.
*/
static _Bool Initialized = 0;
if (Initialized) return;
Initialized = 1;
/* Only register the global dtor handler if there is at least one global
* dtor!
*/
if (__llvm_getGlobalDtors()[0].FP)
if (atexit(run_destructors))
abort(); /* Should be able to install ONE atexit handler! */
/* FIXME: This should sort the list by priority! */
if (R->FP)
for (; R->FP; ++R)
R->FP();
}
static void run_destructors(void) {
/* Loop over all of the destructor records, calling each function pointer. */
TorRec *R = __llvm_getGlobalDtors();
/* FIXME: This should sort the list by priority! */
for (; R->FP; ++R)
R->FP();
}
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