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203 lines
9.5 KiB
203 lines
9.5 KiB
// Macros for correct module ordering.
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#ifndef _CL_MODULES_H
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#define _CL_MODULES_H
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// The order of initialization of different compilation units is not
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// specified in C++. AIX 4 has a linker which apparently does order
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// the modules according to dependencies, so that low-level modules
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// will be initialized earlier than the high-level modules which depend
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// on them. I have a patch for GNU ld that does the same thing.
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//
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// But for now, I take a half-automatic approach to the correct module
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// ordering problem: PROVIDE/REQUIRE, as in Common Lisp.
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//
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// CL_PROVIDE(module) must be the first code-generating entity in a module.
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// Inline function definitions can precede it, but global variable/function/
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// class definitions may not precede it.
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// Afterwards, any number of CL_REQUIRE(othermodule) is allowed.
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// At the end of the module, there must be a corresponding
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// CL_PROVIDE_END(module). (Sorry for this, it's really needed.)
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//
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// These macros work only with g++, and only in optimizing mode. But who
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// wants to use CLN with other C++ compilers anyway...
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// How to apply these macros:
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// 1. Find out about variables which need to be initialized.
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// On Linux/ELF, you can use a command like
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// $ nm -o libcln.a | grep -v ' [UTtRrW] ' | sort +1
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// A symbol of type "D" or "d" lies in the preinitialized DATA section,
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// a symbol of type "B" or "b" lies in the uninitialized BSS section.
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// All of them have to be checked.
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// - Those which contain POD (= plain old data, i.e. scalar values or
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// class instances without nontrivial constructors) are already fully
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// initialized by the linker and can be discarded from these considerations.
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// - Those which are static variables inside a function (you recognize
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// them: g++ appends a dot and a number to their name) are initialized
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// the first time the function is entered. They can be discarded from
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// our considerations as well.
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// 2. Find out which of these variables are publically exposed (to the user of
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// the library) through the library's include files, either directly or
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// through inline functions, or indirectly through normal function calls.
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// These variables can be referenced from any user module U, hence any
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// such module must CL_REQUIRE(M) the variable's definition module M.
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// Since there is no CL_REQUIRE_IF_NEEDED(M) macro (which is equivalent
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// to CL_REQUIRE(M) if the required module will be part of the executable
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// but does nothing if M is not used), we must preventively put the
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// CL_REQUIRE(M) into the header file. Hopefully M is either used anyway
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// or does not bring in too much code into the executable.
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// 3. Variables which are not publicly exposed but used internally by the
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// library can be handled by adding a CL_REQUIRE in all the library's
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// modules which directly or indirectly use the variable.
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// 4. Variables and functions which can be reasonably assumed to not be
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// accessed or executed during initialization need not be treated.
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// For example, I/O to external streams, exception handling facilities,
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// number theory stuff, etc.
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// OK, stop reading here, because it's getting obscene.
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#if defined(__GNUC__) && defined(__OPTIMIZE__) && !(defined(__hppa__) && (__GNUC__ == 2) && (__GNUC_MINOR__ < 8)) && !defined(NO_PROVIDE_REQUIRE)
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#ifdef ASM_UNDERSCORE
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#define ASM_UNDERSCORE_PREFIX "_"
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#else
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#define ASM_UNDERSCORE_PREFIX ""
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#endif
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// Globalize a label defined in the same translation unit.
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// See macro ASM_GLOBALIZE_LABEL in the egcs sources.
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#if defined(__i386__) || defined(__m68k__) || defined(__mips__) || defined(__mips64__) || defined(__alpha__) || defined(__rs6000__)
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// Some m68k systems use "xdef" or "global" or ".global"...
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#define CL_GLOBALIZE_LABEL(label) __asm__("\t.globl " label);
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#endif
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#if defined(__sparc__) || defined(__sparc64__) || defined(__arm__)
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// Some arm systems use "EXPORT" or ".globl"...
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#define CL_GLOBALIZE_LABEL(label) __asm__("\t.global " label);
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#endif
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#if defined(__hppa__)
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#define CL_GLOBALIZE_LABEL(label) __asm__("\t.EXPORT " label ",ENTRY,PRIV_LEV=3");
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#endif
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#if defined(__m88k__)
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#define CL_GLOBALIZE_LABEL(label) __asm__("\tglobal " label);
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#endif
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#if defined(__convex__)
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#define CL_GLOBALIZE_LABEL(label) __asm__(".globl " label);
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#endif
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#ifndef CL_GLOBALIZE_LABEL
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#define CL_GLOBALIZE_LABEL(label)
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#endif
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#if defined(__rs6000__) || defined(_WIN32)
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#define CL_GLOBALIZE_JUMP_LABEL(label) CL_GLOBALIZE_LABEL(#label)
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#else
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#define CL_GLOBALIZE_JUMP_LABEL(label)
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#endif
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#ifdef CL_NEED_GLOBALIZE_CTORDTOR
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#define CL_GLOBALIZE_CTORDTOR_LABEL(label) CL_GLOBALIZE_LABEL(label)
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#else
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#define CL_GLOBALIZE_CTORDTOR_LABEL(label)
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#endif
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// Output a label inside a function.
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// See macro ASM_OUTPUT_LABEL in the egcs sources.
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#if defined(__hppa__)
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#define CL_OUTPUT_LABEL(label) ASM_VOLATILE ("\n" label)
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#else
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#define CL_OUTPUT_LABEL(label) ASM_VOLATILE ("\n" label ":")
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#endif
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// ASM_VOLATILE(string) is for asms without arguments only!!
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#if ((__GNUC__ == 2) && (__GNUC_MINOR__ >= 91)) || (__GNUC__ >= 3)
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// avoid warning caused by the volatile keyword
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#define ASM_VOLATILE __asm__
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#else
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// need volatile to avoid reordering
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#define ASM_VOLATILE __asm__ __volatile__
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#endif
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// CL_JUMP_TO(addr) jumps to an address, like goto *(void*)(addr),
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// except that the latter inhibits inlining of the function containing it
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// in gcc-2.95. For new CPUs, look for "jump" and "indirect_jump" in gcc's
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// machine description.
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#if defined(__i386__)
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#define CL_JUMP_TO(addr) ASM_VOLATILE("jmp %*%0" : : "rm" ((void*)(addr)))
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#endif
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#if defined(__m68k__)
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#define CL_JUMP_TO(addr) ASM_VOLATILE("jmp %0@" : : "a" ((void*)(addr)))
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#endif
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#if defined(__mips__)
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#define CL_JUMP_TO(addr) ASM_VOLATILE("%*j %0" : : "d" ((void*)(addr)))
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#endif
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#if defined(__sparc__) || defined(__sparc64__)
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#define CL_JUMP_TO(addr) ASM_VOLATILE("jmp %0\n\tnop" : : "r" ((void*)(addr)))
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#endif
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#if defined(__alpha__)
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#define CL_JUMP_TO(addr) ASM_VOLATILE("jmp $31,(%0),0" : : "r" ((void*)(addr)))
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#endif
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#if defined(__hppa__)
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//#define CL_JUMP_TO(addr) ASM_VOLATILE("bv,n 0(%0)" : : "r" ((void*)(addr)))
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#define CL_JUMP_TO(addr) ASM_VOLATILE("b " #addr "\n\tnop")
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#endif
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#if defined(__arm__)
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#define CL_JUMP_TO(addr) ASM_VOLATILE("mov pc,%0" : : "r" ((void*)(addr)))
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#endif
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#if defined(__rs6000__) || defined(__powerpc__) || defined(__ppc__)
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//#define CL_JUMP_TO(addr) ASM_VOLATILE("mtctr %0\n\tbctr" : : "r" ((void*)(addr)))
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#define CL_JUMP_TO(addr) ASM_VOLATILE("b " #addr)
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#endif
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#if defined(__m88k__)
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#define CL_JUMP_TO(addr) ASM_VOLATILE("jmp %0" : : "r" ((void*)(addr)))
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#endif
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#if defined(__convex__)
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#define CL_JUMP_TO(addr) ASM_VOLATILE("jmp (%0)" : : "r" ((void*)(addr)))
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#endif
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#define CL_PROVIDE(module) \
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extern "C" void cl_module__##module##__firstglobalfun () {} \
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extern "C" void cl_module__##module##__ctorend (void); \
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extern "C" void cl_module__##module##__dtorend (void); \
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CL_GLOBALIZE_JUMP_LABEL(cl_module__##module##__ctorend) \
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CL_GLOBALIZE_JUMP_LABEL(cl_module__##module##__dtorend) \
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CL_GLOBALIZE_CTORDTOR_LABEL( \
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ASM_UNDERSCORE_PREFIX CL_GLOBAL_CONSTRUCTOR_PREFIX \
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"cl_module__" #module "__firstglobalfun") \
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CL_GLOBALIZE_CTORDTOR_LABEL( \
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ASM_UNDERSCORE_PREFIX CL_GLOBAL_DESTRUCTOR_PREFIX \
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"cl_module__" #module "__firstglobalfun") \
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static int cl_module__##module##__counter; \
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struct cl_module__##module##__controller { \
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inline cl_module__##module##__controller () \
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{ if (cl_module__##module##__counter++) \
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{ CL_JUMP_TO(cl_module__##module##__ctorend); } \
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} \
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inline ~cl_module__##module##__controller () \
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{ CL_OUTPUT_LABEL (ASM_UNDERSCORE_PREFIX "cl_module__" #module "__dtorend"); } \
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}; \
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static cl_module__##module##__controller cl_module__##module##__ctordummy;
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#define CL_PROVIDE_END(module) \
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struct cl_module__##module##__destroyer { \
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inline cl_module__##module##__destroyer () \
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{ CL_OUTPUT_LABEL (ASM_UNDERSCORE_PREFIX "cl_module__" #module "__ctorend"); } \
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inline ~cl_module__##module##__destroyer () \
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{ if (--cl_module__##module##__counter) \
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{ CL_JUMP_TO(cl_module__##module##__dtorend); } \
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} \
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}; \
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static cl_module__##module##__destroyer cl_module__##module##__dtordummy;
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#define CL_REQUIRE(module) \
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extern "C" void cl_module__##module##__ctor (void) \
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__asm__ (ASM_UNDERSCORE_PREFIX CL_GLOBAL_CONSTRUCTOR_PREFIX \
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"cl_module__" #module "__firstglobalfun"); \
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extern "C" void cl_module__##module##__dtor (void) \
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__asm__ (ASM_UNDERSCORE_PREFIX CL_GLOBAL_DESTRUCTOR_PREFIX \
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"cl_module__" #module "__firstglobalfun"); \
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struct _CL_REQUIRE_CLASSNAME(module,__LINE__) { \
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inline _CL_REQUIRE_CLASSNAME(module,__LINE__) () \
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{ cl_module__##module##__ctor (); } \
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inline ~_CL_REQUIRE_CLASSNAME(module,__LINE__) () \
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{ cl_module__##module##__dtor (); } \
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}; \
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static _CL_REQUIRE_CLASSNAME(module,__LINE__) \
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_CL_REQUIRE_CLASSNAME(module##_requirer,__LINE__);
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#define _CL_REQUIRE_CLASSNAME(module,line) __CL_REQUIRE_CLASSNAME(module,line)
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#define __CL_REQUIRE_CLASSNAME(module,line) cl_module__##module##__##line
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#else
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#define CL_PROVIDE(module)
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#define CL_PROVIDE_END(module)
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#define CL_REQUIRE(module)
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#endif
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#endif /* _CL_MODULES_H */
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