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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6909 91177308-0d34-0410-b5e6-96231b3b80d8
57 lines
1.9 KiB
C
57 lines
1.9 KiB
C
/*===- crtend.c - Initialization code for programs ------------------------===*\
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*
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* This file defines the __main function, which is used to run static
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* constructors and destructors in C++ programs, or with C programs that use GCC
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* extensions to accomplish the same effect.
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*
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* The main data structures used to implement this functionality is the
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* llvm.global_ctors and llvm.global_dtors lists, which are null terminated
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* lists of TorRec (defined below) structures.
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*
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\*===----------------------------------------------------------------------===*/
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#include <stdlib.h>
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/* TorRec - The record type for each element of the ctor/dtor list */
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typedef struct TorRec {
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int Priority;
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void (*FP)(void);
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} TorRec;
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/* __llvm_getGlobalCtors, __llvm_getGlobalDtors - Interface to the LLVM
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* listend.ll file to get access to the start of the ctor and dtor lists...
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*/
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TorRec *__llvm_getGlobalCtors(void);
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TorRec *__llvm_getGlobalDtors(void);
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static void run_destructors(void);
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/* __main - A call to this function is automatically inserted into the top of
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* the "main" function in the program compiled. This function is responsible
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* for calling static constructors before the program starts executing.
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*/
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void __main(void) {
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/* Loop over all of the constructor records, calling each function pointer. */
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TorRec *R = __llvm_getGlobalCtors();
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/* Only register the global dtor handler if there is at least one global
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* dtor!
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*/
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if (__llvm_getGlobalDtors()[0].FP)
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if (atexit(run_destructors))
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abort(); /* Should be able to install ONE atexit handler! */
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/* FIXME: This should sort the list by priority! */
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for (; R->FP; ++R)
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R->FP();
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}
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static void run_destructors(void) {
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/* Loop over all of the destructor records, calling each function pointer. */
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TorRec *R = __llvm_getGlobalDtors();
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/* FIXME: This should sort the list by priority! */
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for (; R->FP; ++R)
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R->FP();
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}
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