From daac729f4d7d13b64e64492f01287145f2c14b53 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Thu, 9 Mar 2006 06:16:28 +0000
Subject: [PATCH] Make the new and old front-ends more similar: now neither
 uses __main.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26629 91177308-0d34-0410-b5e6-96231b3b80d8
---
 runtime/GCCLibraries/crtend/Makefile   |  4 +-
 runtime/GCCLibraries/crtend/README.txt |  2 +-
 runtime/GCCLibraries/crtend/crtend.c   | 59 +-------------------------
 runtime/GCCLibraries/crtend/listend.ll | 23 ----------
 4 files changed, 5 insertions(+), 83 deletions(-)
 delete mode 100644 runtime/GCCLibraries/crtend/listend.ll

diff --git a/runtime/GCCLibraries/crtend/Makefile b/runtime/GCCLibraries/crtend/Makefile
index 285f4be6d50..04e414fad67 100644
--- a/runtime/GCCLibraries/crtend/Makefile
+++ b/runtime/GCCLibraries/crtend/Makefile
@@ -20,7 +20,7 @@ DONT_BUILD_RELINKED = 1
 LIBRARYNAME = crtend
 BYTECODE_DESTINATION = $(CFERuntimeLibDir)
 
-MainSrc      := crtend.c listend.ll
+MainSrc      := crtend.c
 GenericEHSrc := Exception.cpp
 SJLJEHSrc    := SJLJ-Exception.cpp
 
@@ -29,7 +29,7 @@ EXTRA_DIST   := $(MainSrc) $(GenericEHSrc) $(SJLJEHSrc) \
 
 include $(LEVEL)/Makefile.common
 
-MainObj      := $(ObjDir)/crtend.bc $(ObjDir)/listend.bc
+MainObj      := $(ObjDir)/crtend.bc
 GenericEHObj := $(ObjDir)/Exception.bc
 SJLJEHObj    := $(ObjDir)/SJLJ-Exception.bc
 
diff --git a/runtime/GCCLibraries/crtend/README.txt b/runtime/GCCLibraries/crtend/README.txt
index ff070c442c2..a763cb26dd3 100644
--- a/runtime/GCCLibraries/crtend/README.txt
+++ b/runtime/GCCLibraries/crtend/README.txt
@@ -1,7 +1,7 @@
 This directory contains the C and C++ runtime libraries for the LLVM GCC
 front-ends.  It is composed of four distinct pieces:
 
-1. __main and static ctor/dtor support.  This is used by both C and C++ codes.
+1. __main: now dead, but provided for compatibility.
 
 2. Generic EH support routines.  This is used by C/C++ programs that use
    setjmp/longjmp, and by C++ programs that make use of exceptions.
diff --git a/runtime/GCCLibraries/crtend/crtend.c b/runtime/GCCLibraries/crtend/crtend.c
index 74e7831deeb..561b6fd2415 100644
--- a/runtime/GCCLibraries/crtend/crtend.c
+++ b/runtime/GCCLibraries/crtend/crtend.c
@@ -7,65 +7,10 @@
  *
  *===----------------------------------------------------------------------===*
  *
- * 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.
+ * This file defines the __main function, which we preserve for backwards 
+ * compatibility.
  *
 \*===----------------------------------------------------------------------===*/
 
-#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();
 }
diff --git a/runtime/GCCLibraries/crtend/listend.ll b/runtime/GCCLibraries/crtend/listend.ll
deleted file mode 100644
index a8cee070c9f..00000000000
--- a/runtime/GCCLibraries/crtend/listend.ll
+++ /dev/null
@@ -1,23 +0,0 @@
-; global_ctors/global_dtors terminator: this is used to add a terminating null
-; value to the initialization list.
-
-%struct..TorRec = type { int, void ()* }
-
-%llvm.global_ctors = appending global [1 x %struct..TorRec] [
-    %struct..TorRec { int 2147483647, void ()* null }
-  ]
-
-%llvm.global_dtors = appending global [1 x %struct..TorRec] [
-    %struct..TorRec { int 2147483647, void ()* null }
-  ]
-
-implementation
-
-%struct..TorRec* %__llvm_getGlobalCtors() {
-  ret %struct..TorRec* getelementptr ([1 x %struct..TorRec]* %llvm.global_ctors,
-                                     long 0, long 0)
-}
-%struct..TorRec* %__llvm_getGlobalDtors() {
-  ret %struct..TorRec* getelementptr ([1 x %struct..TorRec]* %llvm.global_dtors,
-                                     long 0, long 0)
-}