-// The order of initialization of different compilation units is not
-// specified in C++. AIX 4 has a linker which apparently does order
-// the modules according to dependencies, so that low-level modules
-// will be initialized earlier than the high-level modules which depend
-// on them. I (Bruno) have a patch for GNU ld that does the same thing.
-//
-// But for now, I take a half-automatic approach to the correct module
-// ordering problem: PROVIDE/REQUIRE, as in Common Lisp.
-//
-// CL_PROVIDE(module) must be the first code-generating entity in a module.
-// Inline function definitions can precede it, but global variable/function/
-// class definitions may not precede it.
-// Afterwards, any number of CL_REQUIRE(othermodule) is allowed.
-// At the end of the module, there must be a corresponding
-// CL_PROVIDE_END(module). (Sorry for this, it's really needed.)
-//
-// These macros work only with g++, and only in optimizing mode. But who
-// wants to use CLN with other C++ compilers anyway...
-
-// How to apply these macros:
-// 1. Find out about variables which need to be initialized.
-// On Linux/ELF, you can use a command like
-// $ nm -o libcln.a | grep -v ' [UTtRrW] ' | sort +1
-// A symbol of type "D" or "d" lies in the preinitialized DATA section,
-// a symbol of type "B" or "b" lies in the uninitialized BSS section.
-// All of them have to be checked.
-// - Those which contain POD (= plain old data, i.e. scalar values or
-// class instances without nontrivial constructors) are already fully
-// initialized by the linker and can be discarded from these considerations.
-// - Those which are static variables inside a function (you recognize
-// them: g++ appends a dot and a number to their name) are initialized
-// the first time the function is entered. They can be discarded from
-// our considerations as well.
-// 2. Find out which of these variables are publically exposed (to the user of
-// the library) through the library's include files, either directly or
-// through inline functions, or indirectly through normal function calls.
-// These variables can be referenced from any user module U, hence any
-// such module must CL_REQUIRE(M) the variable's definition module M.
-// Since there is no CL_REQUIRE_IF_NEEDED(M) macro (which is equivalent
-// to CL_REQUIRE(M) if the required module will be part of the executable
-// but does nothing if M is not used), we must preventively put the
-// CL_REQUIRE(M) into the header file. Hopefully M is either used anyway
-// or does not bring in too much code into the executable.
-// 3. Variables which are not publicly exposed but used internally by the
-// library can be handled by adding a CL_REQUIRE in all the library's
-// modules which directly or indirectly use the variable.
-// 4. Variables and functions which can be reasonably assumed to not be
-// accessed or executed during initialization need not be treated.
-// For example, I/O to external streams, exception handling facilities,
-// number theory stuff, etc.
-
-// OK, stop reading here, because it's getting obscene.
-
-#if defined(PIC)
- #define CL_GLOBAL_CONSTRUCTOR_SUFFIX CL_GLOBAL_CONSTRUCTOR_SUFFIX_PIC
-#else
- #define CL_GLOBAL_CONSTRUCTOR_SUFFIX CL_GLOBAL_CONSTRUCTOR_SUFFIX_NOPIC
-#endif
-
-#if defined(__GNUC__) && defined(__OPTIMIZE__) && !(defined(__hppa__) && (__GNUC__ == 2) && (__GNUC_MINOR__ < 8)) && !defined(NO_PROVIDE_REQUIRE)
- #ifdef ASM_UNDERSCORE
- #define ASM_UNDERSCORE_PREFIX "_"
- #else
- #define ASM_UNDERSCORE_PREFIX ""
- #endif
- // Globalize a label defined in the same translation unit.
- // See macro ASM_GLOBALIZE_LABEL in the gcc sources.
- #if defined(__i386__) || defined(__m68k__) || defined(__mips__) || defined(__mipsel__) || defined(__mips64__) || defined(__alpha__) || defined(__rs6000__) || defined(__powerpc64__) || defined(__x86_64__) || defined(__s390__)
- // Some m68k systems use "xdef" or "global" or ".global"...
- #define CL_GLOBALIZE_LABEL(label) __asm__("\t.globl " label);
- #endif
- #if defined(__sparc__) || defined(__sparc64__) || defined(__arm__) || defined(__ia64__)
- // Some arm systems use "EXPORT" or ".globl"...
- #define CL_GLOBALIZE_LABEL(label) __asm__("\t.global " label);
- #endif
- #if defined(__hppa__)
- #define CL_GLOBALIZE_LABEL(label) __asm__("\t.EXPORT " label ",ENTRY,PRIV_LEV=3");
- #endif
- #if defined(__m88k__)
- #define CL_GLOBALIZE_LABEL(label) __asm__("\tglobal " label);
- #endif
- #if defined(__convex__)
- #define CL_GLOBALIZE_LABEL(label) __asm__(".globl " label);
- #endif
- #ifndef CL_GLOBALIZE_LABEL
- #define CL_GLOBALIZE_LABEL(label)
- #endif
- #if defined(__rs6000__) || defined(_WIN32)
- #define CL_GLOBALIZE_JUMP_LABEL(label) CL_GLOBALIZE_LABEL(ASM_UNDERSCORE_PREFIX #label)
- #else
- #define CL_GLOBALIZE_JUMP_LABEL(label)
- #endif
- #ifdef CL_NEED_GLOBALIZE_CTORDTOR
- #define CL_GLOBALIZE_CTORDTOR_LABEL(label) CL_GLOBALIZE_LABEL(label)
- #else
- #define CL_GLOBALIZE_CTORDTOR_LABEL(label)
- #endif
- // Output a label inside a function.
- // See macro ASM_OUTPUT_LABEL in the gcc sources.
- #if defined(__ia64__)
- // g++-4.0 on IA64 likes to duplicate parts of basic blocks for no good
- // reason. To avoid an error when a label is defined twice, we can either
- // append "-Os" to the CXXFLAGS (then g++ does not create redundant
- // duplicates of basic blocks), or declare the label in a way that may
- // be redefined.
- // Why the "nop 0"? Apparently "." refers to the last instruction bundle.
- // Just ".set label,." would cause the branch to executed unwanted code.
- // And ".set label,.+16" might not work at the very beginning of a
- // function. So we spend a nop; it becomes the target of the jump.
- #define CL_OUTPUT_LABEL(label) ASM_VOLATILE ("nop 0" "\n" ".set " label ", .")
- #elif defined(__m68k__)
- // C.f. IA64 case above.
- #define CL_OUTPUT_LABEL(label) ASM_VOLATILE ("nop" "\n" ".set " label ", .")
- #else
- #define CL_OUTPUT_LABEL(label) ASM_VOLATILE ("\n" label ":")
- #endif
- // ASM_VOLATILE(string) is for asms without arguments only!!
- #if ((__GNUC__ == 2) && (__GNUC_MINOR__ >= 91)) || (__GNUC__ >= 3)
- // avoid warning caused by the volatile keyword
- #define ASM_VOLATILE __asm__
- #else
- // need volatile to avoid reordering
- #define ASM_VOLATILE __asm__ __volatile__
- #endif
- // CL_JUMP_TO(addr) jumps to an address, like goto *(void*)(addr),
- // except that the latter inhibits inlining of the function containing it
- // in gcc-2.95. For new CPUs, look for "jump" and "indirect_jump" in gcc's
- // machine description.
- #if defined(__i386__)
- #if defined(__APPLE__) && defined(__MACH__)
- #define CL_JUMP_TO(addr) ASM_VOLATILE("jmp " ASM_UNDERSCORE_PREFIX #addr)
- #else
- #define CL_JUMP_TO(addr) ASM_VOLATILE("jmp %*%0" : : "rm" ((void*)(addr)))
- #endif
- #endif
- #if defined(__x86_64__)
- #define CL_JUMP_TO(addr) ASM_VOLATILE("jmp " ASM_UNDERSCORE_PREFIX #addr)
- #endif
- #if defined(__m68k__)
- //#define CL_JUMP_TO(addr) ASM_VOLATILE("jmp %0@" : : "a" ((void*)(addr)))
- #define CL_JUMP_TO(addr) ASM_VOLATILE("jmp (" ASM_UNDERSCORE_PREFIX #addr ",%pc)")
- #endif
- #if defined(__mips__) || defined(__mipsel__)
- //#define CL_JUMP_TO(addr) ASM_VOLATILE("%*j %0" : : "d" ((void*)(addr)))
- #define CL_JUMP_TO(addr) ASM_VOLATILE("b " ASM_UNDERSCORE_PREFIX #addr)
- #endif
- #if defined(__sparc__) || defined(__sparc64__)
- #define CL_JUMP_TO(addr) ASM_VOLATILE("jmp %0\n\tnop" : : "r" ((void*)(addr)))
- #endif
- #if defined(__alpha__)
- #define CL_JUMP_TO(addr) ASM_VOLATILE("jmp $31,(%0),0" : : "r" ((void*)(addr)))
- #endif
- #if defined(__hppa__)
- //#define CL_JUMP_TO(addr) ASM_VOLATILE("bv,n 0(%0)" : : "r" ((void*)(addr)))
- #define CL_JUMP_TO(addr) ASM_VOLATILE("b " ASM_UNDERSCORE_PREFIX #addr "\n\tnop")
- #endif
- #if defined(__arm__)
- #define CL_JUMP_TO(addr) ASM_VOLATILE("mov pc,%0" : : "r" ((void*)(addr)))
- #endif
- #if defined(__rs6000__) || defined(__powerpc__) || defined(__ppc__) || defined(__powerpc64__)
- //#define CL_JUMP_TO(addr) ASM_VOLATILE("mtctr %0\n\tbctr" : : "r" ((void*)(addr)))
- #define CL_JUMP_TO(addr) ASM_VOLATILE("b " ASM_UNDERSCORE_PREFIX #addr)
- #endif
- #if defined(__m88k__)
- #define CL_JUMP_TO(addr) ASM_VOLATILE("jmp %0" : : "r" ((void*)(addr)))
- #endif
- #if defined(__convex__)
- #define CL_JUMP_TO(addr) ASM_VOLATILE("jmp (%0)" : : "r" ((void*)(addr)))
- #endif
- #if defined(__ia64__)
- #define CL_JUMP_TO(addr) ASM_VOLATILE("br " ASM_UNDERSCORE_PREFIX #addr)
- #endif
- #if defined(__s390__)
- #define CL_JUMP_TO(addr) ASM_VOLATILE("br %0" : : "a" ((void*)(addr)))
- #endif
- #ifdef CL_GLOBAL_DESTRUCTOR_PREFIX
- #define CL_PROVIDE(module) \
- extern "C" void cl_module__##module##__firstglobalfun () {} \
- extern "C" void cl_module__##module##__ctorend (void); \
- extern "C" void cl_module__##module##__dtorend (void); \
- CL_GLOBALIZE_JUMP_LABEL(cl_module__##module##__ctorend) \
- CL_GLOBALIZE_JUMP_LABEL(cl_module__##module##__dtorend) \
- CL_GLOBALIZE_CTORDTOR_LABEL( \
- ASM_UNDERSCORE_PREFIX CL_GLOBAL_CONSTRUCTOR_PREFIX \
- "cl_module__" #module "__firstglobalfun") \
- CL_GLOBALIZE_CTORDTOR_LABEL( \
- ASM_UNDERSCORE_PREFIX CL_GLOBAL_DESTRUCTOR_PREFIX \
- "cl_module__" #module "__firstglobalfun") \
- static int cl_module__##module##__counter; \
- struct cl_module__##module##__controller { \
- inline cl_module__##module##__controller () \
- { if (cl_module__##module##__counter++) \
- { CL_JUMP_TO(cl_module__##module##__ctorend); } \
- } \
- inline ~cl_module__##module##__controller () \
- { CL_OUTPUT_LABEL (ASM_UNDERSCORE_PREFIX "cl_module__" #module "__dtorend"); } \
- }; \
- static cl_module__##module##__controller cl_module__##module##__ctordummy;
- #define CL_PROVIDE_END(module) \
- struct cl_module__##module##__destroyer { \
- inline cl_module__##module##__destroyer () \
- { CL_OUTPUT_LABEL (ASM_UNDERSCORE_PREFIX "cl_module__" #module "__ctorend"); } \
- inline ~cl_module__##module##__destroyer () \
- { if (--cl_module__##module##__counter) \
- { CL_JUMP_TO(cl_module__##module##__dtorend); } \
- } \
- }; \
- static cl_module__##module##__destroyer cl_module__##module##__dtordummy;
- #define CL_REQUIRE(module) \
- extern "C" void cl_module__##module##__ctor (void) \
- __asm__ (ASM_UNDERSCORE_PREFIX CL_GLOBAL_CONSTRUCTOR_PREFIX \
- "cl_module__" #module "__firstglobalfun"); \
- extern "C" void cl_module__##module##__dtor (void) \
- __asm__ (ASM_UNDERSCORE_PREFIX CL_GLOBAL_DESTRUCTOR_PREFIX \
- "cl_module__" #module "__firstglobalfun"); \
- struct _CL_REQUIRE_CLASSNAME(module,__LINE__) { \
- inline _CL_REQUIRE_CLASSNAME(module,__LINE__) () \
- { cl_module__##module##__ctor (); } \
- inline ~_CL_REQUIRE_CLASSNAME(module,__LINE__) () \
- { cl_module__##module##__dtor (); } \
- }; \
- static _CL_REQUIRE_CLASSNAME(module,__LINE__) \
- _CL_REQUIRE_CLASSNAME(module##_requirer,__LINE__);
- #else
- // gcc-3.0 -fuse-cxa-atexit doesn't have a single per-module destructor
- // function anymore. Instead, for each object's static constructor it
- // executes, it pushes the corresponding object's destructor onto a list.
- // Thus we need to hack the constructors only. gcc-4.3 uses different names
- // for global ctors in shared and static objects, so we cannot directly
- // call the ctors from CL_REQUIRE(M): the compiling function does not know
- // yet how it's going to be linked. Hence, we must hide the ctor call beind
- // an additional indirection.
- #define CL_PROVIDE(module) \
- extern "C" void cl_module__##module##__firstglobalfun () {} \
- extern "C" void cl_module__##module##__ctorend (); \
- extern "C" void cl_module__##module##__docallctors () \
- __asm__ (ASM_UNDERSCORE_PREFIX CL_GLOBAL_CONSTRUCTOR_PREFIX \
- CL_GLOBAL_CONSTRUCTOR_SUFFIX(module)); \
- extern "C" void cl_module__##module##__globalctors () \
- { cl_module__##module##__docallctors(); } \
- CL_GLOBALIZE_CTORDTOR_LABEL( \
- ASM_UNDERSCORE_PREFIX CL_GLOBAL_CONSTRUCTOR_PREFIX \
- CL_GLOBAL_CONSTRUCTOR_SUFFIX(module)) \
- static int cl_module__##module##__counter; \
- struct cl_module__##module##__controller { \
- inline cl_module__##module##__controller () \
- { if (cl_module__##module##__counter++) \
- { CL_JUMP_TO(cl_module__##module##__ctorend); } \
- } \
- }; \
- static cl_module__##module##__controller cl_module__##module##__ctordummy;
- #define CL_PROVIDE_END(module) \
- struct cl_module__##module##__destroyer { \
- inline cl_module__##module##__destroyer () \
- { CL_OUTPUT_LABEL (ASM_UNDERSCORE_PREFIX "cl_module__" #module "__ctorend"); } \
- }; \
- static cl_module__##module##__destroyer cl_module__##module##__dtordummy;
- #define CL_REQUIRE(module) \
- extern "C" void cl_module__##module##__ctor () \
- __asm__ (ASM_UNDERSCORE_PREFIX "cl_module__" #module "__globalctors"); \
- struct _CL_REQUIRE_CLASSNAME(module,__LINE__) { \
- inline _CL_REQUIRE_CLASSNAME(module,__LINE__) () \
- { cl_module__##module##__ctor (); } \
- }; \
- static _CL_REQUIRE_CLASSNAME(module,__LINE__) \
- _CL_REQUIRE_CLASSNAME(module##_requirer,__LINE__);
- #endif
- #define _CL_REQUIRE_CLASSNAME(module,line) __CL_REQUIRE_CLASSNAME(module,line)
- #define __CL_REQUIRE_CLASSNAME(module,line) cl_module__##module##__##line
-#else
- #define CL_PROVIDE(module)
- #define CL_PROVIDE_END(module)
- #define CL_REQUIRE(module)
-#endif
-
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