diff options
Diffstat (limited to 'src/mesa/glapi')
| -rw-r--r-- | src/mesa/glapi/glapi.c | 652 | ||||
| -rw-r--r-- | src/mesa/glapi/glapi.h | 12 | ||||
| -rw-r--r-- | src/mesa/glapi/glapi_getproc.c | 615 |
3 files changed, 655 insertions, 624 deletions
diff --git a/src/mesa/glapi/glapi.c b/src/mesa/glapi/glapi.c index 47c5782273..ed59ddb0b7 100644 --- a/src/mesa/glapi/glapi.c +++ b/src/mesa/glapi/glapi.c @@ -1,8 +1,8 @@ /* * Mesa 3-D graphics library - * Version: 6.5 + * Version: 7.1 * - * Copyright (C) 1999-2006 Brian Paul All Rights Reserved. + * Copyright (C) 1999-2008 Brian Paul All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), @@ -55,18 +55,12 @@ #include "glapioffsets.h" #include "glapitable.h" + /***** BEGIN NO-OP DISPATCH *****/ static GLboolean WarnFlag = GL_FALSE; static _glapi_warning_func warning_func; -#if defined(PTHREADS) || defined(GLX_USE_TLS) -static void init_glapi_relocs(void); -#endif - -static _glapi_proc generate_entrypoint(GLuint functionOffset); -static void fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset); - /* * Enable/disable printing of warning messages. */ @@ -205,21 +199,6 @@ PUBLIC void *_glapi_Context = NULL; /*@}*/ -/** - * strdup() is actually not a standard ANSI C or POSIX routine. - * Irix will not define it if ANSI mode is in effect. - */ -static char * -str_dup(const char *str) -{ - char *copy; - copy = (char*) malloc(strlen(str) + 1); - if (!copy) - return NULL; - strcpy(copy, str); - return copy; -} - /** @@ -297,6 +276,32 @@ _glapi_get_context(void) +#if defined(PTHREADS) || defined(GLX_USE_TLS) +/** + * Perform platform-specific GL API entry-point fixups. + */ +static void +init_glapi_relocs( void ) +{ +#if defined(USE_X86_ASM) && defined(GLX_USE_TLS) && !defined(GLX_X86_READONLY_TEXT) + extern unsigned long _x86_get_dispatch(void); + char run_time_patch[] = { + 0x65, 0xa1, 0, 0, 0, 0 /* movl %gs:0,%eax */ + }; + GLuint *offset = (GLuint *) &run_time_patch[2]; /* 32-bits for x86/32 */ + const GLubyte * const get_disp = (const GLubyte *) run_time_patch; + GLubyte * curr_func = (GLubyte *) gl_dispatch_functions_start; + + *offset = _x86_get_dispatch(); + while ( curr_func != (GLubyte *) gl_dispatch_functions_end ) { + (void) memcpy( curr_func, get_disp, sizeof(run_time_patch)); + curr_func += DISPATCH_FUNCTION_SIZE; + } +#endif +} +#endif /* defined(PTHREADS) || defined(GLX_USE_TLS) */ + + /** * Set the global or per-thread dispatch table pointer. * If the dispatch parameter is NULL we'll plug in the no-op dispatch @@ -353,132 +358,6 @@ _glapi_get_dispatch(void) -/*** - *** The rest of this file is pretty much concerned with GetProcAddress - *** functionality. - ***/ - -#if defined(USE_X64_64_ASM) && defined(GLX_USE_TLS) -# define DISPATCH_FUNCTION_SIZE 16 -#elif defined(USE_X86_ASM) -# if defined(THREADS) && !defined(GLX_USE_TLS) -# define DISPATCH_FUNCTION_SIZE 32 -# else -# define DISPATCH_FUNCTION_SIZE 16 -# endif -#endif - -#if !defined(DISPATCH_FUNCTION_SIZE) && !defined(XFree86Server) && !defined(XGLServer) -# define NEED_FUNCTION_POINTER -#endif - -/* The code in this file is auto-generated with Python */ -#include "glprocs.h" - - -/** - * Search the table of static entrypoint functions for the named function - * and return the corresponding glprocs_table_t entry. - */ -static const glprocs_table_t * -find_entry( const char * n ) -{ - GLuint i; - for (i = 0; static_functions[i].Name_offset >= 0; i++) { - const char *testName = gl_string_table + static_functions[i].Name_offset; - if (strcmp(testName, n) == 0) { - return &static_functions[i]; - } - } - return NULL; -} - - -/** - * Return dispatch table offset of the named static (built-in) function. - * Return -1 if function not found. - */ -static GLint -get_static_proc_offset(const char *funcName) -{ - const glprocs_table_t * const f = find_entry( funcName ); - if (f) { - return f->Offset; - } - return -1; -} - - -#if !defined(XFree86Server) && !defined(XGLServer) -#ifdef USE_X86_ASM - -#if defined( GLX_USE_TLS ) -extern GLubyte gl_dispatch_functions_start[]; -extern GLubyte gl_dispatch_functions_end[]; -#else -extern const GLubyte gl_dispatch_functions_start[]; -#endif - -#endif /* USE_X86_ASM */ - - -/** - * Return dispatch function address for the named static (built-in) function. - * Return NULL if function not found. - */ -static _glapi_proc -get_static_proc_address(const char *funcName) -{ - const glprocs_table_t * const f = find_entry( funcName ); - if (f) { -#if defined(DISPATCH_FUNCTION_SIZE) && defined(GLX_INDIRECT_RENDERING) - return (f->Address == NULL) - ? (_glapi_proc) (gl_dispatch_functions_start - + (DISPATCH_FUNCTION_SIZE * f->Offset)) - : f->Address; -#elif defined(DISPATCH_FUNCTION_SIZE) - return (_glapi_proc) (gl_dispatch_functions_start - + (DISPATCH_FUNCTION_SIZE * f->Offset)); -#else - return f->Address; -#endif - } - else { - return NULL; - } -} - -#endif /* !defined(XFree86Server) && !defined(XGLServer) */ - - - -/** - * Return the name of the function at the given offset in the dispatch - * table. For debugging only. - */ -static const char * -get_static_proc_name( GLuint offset ) -{ - GLuint i; - for (i = 0; static_functions[i].Name_offset >= 0; i++) { - if (static_functions[i].Offset == offset) { - return gl_string_table + static_functions[i].Name_offset; - } - } - return NULL; -} - - - -/********************************************************************** - * Extension function management. - */ - -/* - * Number of extension functions which we can dynamically add at runtime. - */ -#define MAX_EXTENSION_FUNCS 300 - /* * The dispatch table size (number of entries) is the size of the @@ -490,450 +369,6 @@ get_static_proc_name( GLuint offset ) /** - * Track information about a function added to the GL API. - */ -struct _glapi_function { - /** - * Name of the function. - */ - const char * name; - - - /** - * Text string that describes the types of the parameters passed to the - * named function. Parameter types are converted to characters using the - * following rules: - * - 'i' for \c GLint, \c GLuint, and \c GLenum - * - 'p' for any pointer type - * - 'f' for \c GLfloat and \c GLclampf - * - 'd' for \c GLdouble and \c GLclampd - */ - const char * parameter_signature; - - - /** - * Offset in the dispatch table where the pointer to the real function is - * located. If the driver has not requested that the named function be - * added to the dispatch table, this will have the value ~0. - */ - unsigned dispatch_offset; - - - /** - * Pointer to the dispatch stub for the named function. - * - * \todo - * The semantic of this field should be changed slightly. Currently, it - * is always expected to be non-\c NULL. However, it would be better to - * only allocate the entry-point stub when the application requests the - * function via \c glXGetProcAddress. This would save memory for all the - * functions that the driver exports but that the application never wants - * to call. - */ - _glapi_proc dispatch_stub; -}; - - -static struct _glapi_function ExtEntryTable[MAX_EXTENSION_FUNCS]; -static GLuint NumExtEntryPoints = 0; - -#ifdef USE_SPARC_ASM -extern void __glapi_sparc_icache_flush(unsigned int *); -#endif - -/** - * Generate a dispatch function (entrypoint) which jumps through - * the given slot number (offset) in the current dispatch table. - * We need assembly language in order to accomplish this. - */ -static _glapi_proc -generate_entrypoint(GLuint functionOffset) -{ -#if defined(USE_X86_ASM) - /* 32 is chosen as something of a magic offset. For x86, the dispatch - * at offset 32 is the first one where the offset in the - * "jmp OFFSET*4(%eax)" can't be encoded in a single byte. - */ - const GLubyte * const template_func = gl_dispatch_functions_start - + (DISPATCH_FUNCTION_SIZE * 32); - GLubyte * const code = (GLubyte *) malloc(DISPATCH_FUNCTION_SIZE); - - - if ( code != NULL ) { - (void) memcpy(code, template_func, DISPATCH_FUNCTION_SIZE); - fill_in_entrypoint_offset( (_glapi_proc) code, functionOffset ); - } - - return (_glapi_proc) code; -#elif defined(USE_SPARC_ASM) - -#ifdef __arch64__ - static const unsigned int insn_template[] = { - 0x05000000, /* sethi %uhi(_glapi_Dispatch), %g2 */ - 0x03000000, /* sethi %hi(_glapi_Dispatch), %g1 */ - 0x8410a000, /* or %g2, %ulo(_glapi_Dispatch), %g2 */ - 0x82106000, /* or %g1, %lo(_glapi_Dispatch), %g1 */ - 0x8528b020, /* sllx %g2, 32, %g2 */ - 0xc2584002, /* ldx [%g1 + %g2], %g1 */ - 0x05000000, /* sethi %hi(8 * glapioffset), %g2 */ - 0x8410a000, /* or %g2, %lo(8 * glapioffset), %g2 */ - 0xc6584002, /* ldx [%g1 + %g2], %g3 */ - 0x81c0c000, /* jmpl %g3, %g0 */ - 0x01000000 /* nop */ - }; -#else - static const unsigned int insn_template[] = { - 0x03000000, /* sethi %hi(_glapi_Dispatch), %g1 */ - 0xc2006000, /* ld [%g1 + %lo(_glapi_Dispatch)], %g1 */ - 0xc6006000, /* ld [%g1 + %lo(4*glapioffset)], %g3 */ - 0x81c0c000, /* jmpl %g3, %g0 */ - 0x01000000 /* nop */ - }; -#endif /* __arch64__ */ - unsigned int *code = (unsigned int *) malloc(sizeof(insn_template)); - unsigned long glapi_addr = (unsigned long) &_glapi_Dispatch; - if (code) { - memcpy(code, insn_template, sizeof(insn_template)); - -#ifdef __arch64__ - code[0] |= (glapi_addr >> (32 + 10)); - code[1] |= ((glapi_addr & 0xffffffff) >> 10); - __glapi_sparc_icache_flush(&code[0]); - code[2] |= ((glapi_addr >> 32) & ((1 << 10) - 1)); - code[3] |= (glapi_addr & ((1 << 10) - 1)); - __glapi_sparc_icache_flush(&code[2]); - code[6] |= ((functionOffset * 8) >> 10); - code[7] |= ((functionOffset * 8) & ((1 << 10) - 1)); - __glapi_sparc_icache_flush(&code[6]); -#else - code[0] |= (glapi_addr >> 10); - code[1] |= (glapi_addr & ((1 << 10) - 1)); - __glapi_sparc_icache_flush(&code[0]); - code[2] |= (functionOffset * 4); - __glapi_sparc_icache_flush(&code[2]); -#endif /* __arch64__ */ - } - return (_glapi_proc) code; -#else - (void) functionOffset; - return NULL; -#endif /* USE_*_ASM */ -} - - -/** - * This function inserts a new dispatch offset into the assembly language - * stub that was generated with the preceeding function. - */ -static void -fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset) -{ -#if defined(USE_X86_ASM) - GLubyte * const code = (GLubyte *) entrypoint; - -#if DISPATCH_FUNCTION_SIZE == 32 - *((unsigned int *)(code + 11)) = 4 * offset; - *((unsigned int *)(code + 22)) = 4 * offset; -#elif DISPATCH_FUNCTION_SIZE == 16 && defined( GLX_USE_TLS ) - *((unsigned int *)(code + 8)) = 4 * offset; -#elif DISPATCH_FUNCTION_SIZE == 16 - *((unsigned int *)(code + 7)) = 4 * offset; -#else -# error Invalid DISPATCH_FUNCTION_SIZE! -#endif - -#elif defined(USE_SPARC_ASM) - - /* XXX this hasn't been tested! */ - unsigned int *code = (unsigned int *) entrypoint; -#ifdef __arch64__ - code[6] = 0x05000000; /* sethi %hi(8 * glapioffset), %g2 */ - code[7] = 0x8410a000; /* or %g2, %lo(8 * glapioffset), %g2 */ - code[6] |= ((offset * 8) >> 10); - code[7] |= ((offset * 8) & ((1 << 10) - 1)); - __glapi_sparc_icache_flush(&code[6]); -#else /* __arch64__ */ - code[2] = 0xc6006000; /* ld [%g1 + %lo(4*glapioffset)], %g3 */ - code[2] |= (offset * 4); - __glapi_sparc_icache_flush(&code[2]); -#endif /* __arch64__ */ - -#else - - /* an unimplemented architecture */ - (void) entrypoint; - (void) offset; - -#endif /* USE_*_ASM */ -} - - -/** - * Generate new entrypoint - * - * Use a temporary dispatch offset of ~0 (i.e. -1). Later, when the driver - * calls \c _glapi_add_dispatch we'll put in the proper offset. If that - * never happens, and the user calls this function, he'll segfault. That's - * what you get when you try calling a GL function that doesn't really exist. - * - * \param funcName Name of the function to create an entry-point for. - * - * \sa _glapi_add_entrypoint - */ - -static struct _glapi_function * -add_function_name( const char * funcName ) -{ - struct _glapi_function * entry = NULL; - - if (NumExtEntryPoints < MAX_EXTENSION_FUNCS) { - _glapi_proc entrypoint = generate_entrypoint(~0); - if (entrypoint != NULL) { - entry = & ExtEntryTable[NumExtEntryPoints]; - - ExtEntryTable[NumExtEntryPoints].name = str_dup(funcName); - ExtEntryTable[NumExtEntryPoints].parameter_signature = NULL; - ExtEntryTable[NumExtEntryPoints].dispatch_offset = ~0; - ExtEntryTable[NumExtEntryPoints].dispatch_stub = entrypoint; - NumExtEntryPoints++; - } - } - - return entry; -} - - -/** - * Fill-in the dispatch stub for the named function. - * - * This function is intended to be called by a hardware driver. When called, - * a dispatch stub may be created created for the function. A pointer to this - * dispatch function will be returned by glXGetProcAddress. - * - * \param function_names Array of pointers to function names that should - * share a common dispatch offset. - * \param parameter_signature String representing the types of the parameters - * passed to the named function. Parameter types - * are converted to characters using the following - * rules: - * - 'i' for \c GLint, \c GLuint, and \c GLenum - * - 'p' for any pointer type - * - 'f' for \c GLfloat and \c GLclampf - * - 'd' for \c GLdouble and \c GLclampd - * - * \returns - * The offset in the dispatch table of the named function. A pointer to the - * driver's implementation of the named function should be stored at - * \c dispatch_table[\c offset]. - * - * \sa glXGetProcAddress - * - * \warning - * This function can only handle up to 8 names at a time. As far as I know, - * the maximum number of names ever associated with an existing GL function is - * 4 (\c glPointParameterfSGIS, \c glPointParameterfEXT, - * \c glPointParameterfARB, and \c glPointParameterf), so this should not be - * too painful of a limitation. - * - * \todo - * Determine whether or not \c parameter_signature should be allowed to be - * \c NULL. It doesn't seem like much of a hardship for drivers to have to - * pass in an empty string. - * - * \todo - * Determine if code should be added to reject function names that start with - * 'glX'. - * - * \bug - * Add code to compare \c parameter_signature with the parameter signature of - * a static function. In order to do that, we need to find a way to \b get - * the parameter signature of a static function. - */ - -PUBLIC int -_glapi_add_dispatch( const char * const * function_names, - const char * parameter_signature ) -{ - static int next_dynamic_offset = _gloffset_FIRST_DYNAMIC; - const char * const real_sig = (parameter_signature != NULL) - ? parameter_signature : ""; - struct _glapi_function * entry[8]; - GLboolean is_static[8]; - unsigned i; - unsigned j; - int offset = ~0; - int new_offset; - - - (void) memset( is_static, 0, sizeof( is_static ) ); - (void) memset( entry, 0, sizeof( entry ) ); - - for ( i = 0 ; function_names[i] != NULL ; i++ ) { - /* Do some trivial validation on the name of the function. - */ - - if (!function_names[i] || function_names[i][0] != 'g' || function_names[i][1] != 'l') - return GL_FALSE; - - /* Determine if the named function already exists. If the function does - * exist, it must have the same parameter signature as the function - * being added. - */ - - new_offset = get_static_proc_offset(function_names[i]); - if (new_offset >= 0) { - /* FIXME: Make sure the parameter signatures match! How do we get - * FIXME: the parameter signature for static functions? - */ - - if ( (offset != ~0) && (new_offset != offset) ) { - return -1; - } - - is_static[i] = GL_TRUE; - offset = new_offset; - } - - - for ( j = 0 ; j < NumExtEntryPoints ; j++ ) { - if (strcmp(ExtEntryTable[j].name, function_names[i]) == 0) { - /* The offset may be ~0 if the function name was added by - * glXGetProcAddress but never filled in by the driver. - */ - - if (ExtEntryTable[j].dispatch_offset != ~0) { - if (strcmp(real_sig, ExtEntryTable[j].parameter_signature) - != 0) { - return -1; - } - - if ( (offset != ~0) && (ExtEntryTable[j].dispatch_offset != offset) ) { - return -1; - } - - offset = ExtEntryTable[j].dispatch_offset; - } - - entry[i] = & ExtEntryTable[j]; - break; - } - } - } - - if (offset == ~0) { - offset = next_dynamic_offset; - next_dynamic_offset++; - } - - for ( i = 0 ; function_names[i] != NULL ; i++ ) { - if (! is_static[i] ) { - if (entry[i] == NULL) { - entry[i] = add_function_name( function_names[i] ); - if (entry[i] == NULL) { - /* FIXME: Possible memory leak here. - */ - return -1; - } - } - - entry[i]->parameter_signature = str_dup(real_sig); - fill_in_entrypoint_offset(entry[i]->dispatch_stub, offset); - entry[i]->dispatch_offset = offset; - } - } - - return offset; -} - - -/** - * Return offset of entrypoint for named function within dispatch table. - */ -PUBLIC GLint -_glapi_get_proc_offset(const char *funcName) -{ - /* search extension functions first */ - GLuint i; - for (i = 0; i < NumExtEntryPoints; i++) { - if (strcmp(ExtEntryTable[i].name, funcName) == 0) { - return ExtEntryTable[i].dispatch_offset; - } - } - /* search static functions */ - return get_static_proc_offset(funcName); -} - - - -/** - * Return pointer to the named function. If the function name isn't found - * in the name of static functions, try generating a new API entrypoint on - * the fly with assembly language. - */ -_glapi_proc -_glapi_get_proc_address(const char *funcName) -{ - struct _glapi_function * entry; - GLuint i; - -#ifdef MANGLE - if (funcName[0] != 'm' || funcName[1] != 'g' || funcName[2] != 'l') - return NULL; -#else - if (funcName[0] != 'g' || funcName[1] != 'l') - return NULL; -#endif - - /* search extension functions first */ - for (i = 0; i < NumExtEntryPoints; i++) { - if (strcmp(ExtEntryTable[i].name, funcName) == 0) { - return ExtEntryTable[i].dispatch_stub; - } - } - -#if !defined( XFree86Server ) && !defined( XGLServer ) - /* search static functions */ - { - const _glapi_proc func = get_static_proc_address(funcName); - if (func) - return func; - } -#endif /* !defined( XFree86Server ) */ - - entry = add_function_name(funcName); - return (entry == NULL) ? NULL : entry->dispatch_stub; -} - - - -/** - * Return the name of the function at the given dispatch offset. - * This is only intended for debugging. - */ -const char * -_glapi_get_proc_name(GLuint offset) -{ - GLuint i; - const char * n; - - /* search built-in functions */ - n = get_static_proc_name(offset); - if ( n != NULL ) { - return n; - } - - /* search added extension functions */ - for (i = 0; i < NumExtEntryPoints; i++) { - if (ExtEntryTable[i].dispatch_offset == offset) { - return ExtEntryTable[i].name; - } - } - return NULL; -} - - - -/** * Return size of dispatch table struct as number of functions (or * slots). */ @@ -944,7 +379,6 @@ _glapi_get_dispatch_table_size(void) } - /** * Make sure there are no NULL pointers in the given dispatch table. * Intended for debugging purposes. @@ -952,7 +386,7 @@ _glapi_get_dispatch_table_size(void) void _glapi_check_table(const struct _glapi_table *table) { -#ifdef DEBUG +#ifdef EXTRA_DEBUG const GLuint entries = _glapi_get_dispatch_table_size(); const void **tab = (const void **) table; GLuint i; @@ -1023,29 +457,3 @@ _glapi_check_table(const struct _glapi_table *table) (void) table; #endif } - - -#if defined(PTHREADS) || defined(GLX_USE_TLS) -/** - * Perform platform-specific GL API entry-point fixups. - */ -static void -init_glapi_relocs( void ) -{ -#if defined(USE_X86_ASM) && defined(GLX_USE_TLS) && !defined(GLX_X86_READONLY_TEXT) - extern unsigned long _x86_get_dispatch(void); - char run_time_patch[] = { - 0x65, 0xa1, 0, 0, 0, 0 /* movl %gs:0,%eax */ - }; - GLuint *offset = (GLuint *) &run_time_patch[2]; /* 32-bits for x86/32 */ - const GLubyte * const get_disp = (const GLubyte *) run_time_patch; - GLubyte * curr_func = (GLubyte *) gl_dispatch_functions_start; - - *offset = _x86_get_dispatch(); - while ( curr_func != (GLubyte *) gl_dispatch_functions_end ) { - (void) memcpy( curr_func, get_disp, sizeof(run_time_patch)); - curr_func += DISPATCH_FUNCTION_SIZE; - } -#endif -} -#endif /* defined(PTHREADS) || defined(GLX_USE_TLS) */ diff --git a/src/mesa/glapi/glapi.h b/src/mesa/glapi/glapi.h index 20d35769cf..8f2cf66218 100644 --- a/src/mesa/glapi/glapi.h +++ b/src/mesa/glapi/glapi.h @@ -1,8 +1,8 @@ /* * Mesa 3-D graphics library - * Version: 6.5 + * Version: 7.1 * - * Copyright (C) 1999-2006 Brian Paul All Rights Reserved. + * Copyright (C) 1999-2008 Brian Paul All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), @@ -44,8 +44,10 @@ #ifndef _GLAPI_H #define _GLAPI_H +#define GL_GLEXT_PROTOTYPES #include "GL/gl.h" +#include "GL/glext.h" #include "glthread.h" @@ -66,6 +68,12 @@ typedef void (*_glapi_warning_func)(void *ctx, const char *str, ...); #endif +/* + * Number of extension functions which we can dynamically add at runtime. + */ +#define MAX_EXTENSION_FUNCS 300 + + /** ** Define the GET_CURRENT_CONTEXT() macro. ** \param C local variable which will hold the current context. diff --git a/src/mesa/glapi/glapi_getproc.c b/src/mesa/glapi/glapi_getproc.c new file mode 100644 index 0000000000..b3ecc9d25a --- /dev/null +++ b/src/mesa/glapi/glapi_getproc.c @@ -0,0 +1,615 @@ +/* + * Mesa 3-D graphics library + * Version: 7.1 + * + * Copyright (C) 1999-2008 Brian Paul All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN + * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +/** + * \file glapi_getproc. + * + * Code for implementing glXGetProcAddress(), etc. + * This was originally in glapi.c but refactored out. + */ + + +#include <stdlib.h> +#include <string.h> +#include "glheader.h" +#include "glapi.h" +#include "glapioffsets.h" +#include "glapitable.h" + + +/** + * strdup() is actually not a standard ANSI C or POSIX routine. + * Irix will not define it if ANSI mode is in effect. + */ +static char * +str_dup(const char *str) +{ + char *copy; + copy = (char*) malloc(strlen(str) + 1); + if (!copy) + return NULL; + strcpy(copy, str); + return copy; +} + + + +#if defined(USE_X64_64_ASM) && defined(GLX_USE_TLS) +# define DISPATCH_FUNCTION_SIZE 16 +#elif defined(USE_X86_ASM) +# if defined(THREADS) && !defined(GLX_USE_TLS) +# define DISPATCH_FUNCTION_SIZE 32 +# else +# define DISPATCH_FUNCTION_SIZE 16 +# endif +#endif + +#if !defined(DISPATCH_FUNCTION_SIZE) && !defined(XFree86Server) && !defined(XGLServer) +# define NEED_FUNCTION_POINTER +#endif + +/* The code in this file is auto-generated with Python */ +#include "glprocs.h" + + +/** + * Search the table of static entrypoint functions for the named function + * and return the corresponding glprocs_table_t entry. + */ +static const glprocs_table_t * +find_entry( const char * n ) +{ + GLuint i; + for (i = 0; static_functions[i].Name_offset >= 0; i++) { + const char *testName = gl_string_table + static_functions[i].Name_offset; + if (strcmp(testName, n) == 0) { + return &static_functions[i]; + } + } + return NULL; +} + + +/** + * Return dispatch table offset of the named static (built-in) function. + * Return -1 if function not found. + */ +static GLint +get_static_proc_offset(const char *funcName) +{ + const glprocs_table_t * const f = find_entry( funcName ); + if (f) { + return f->Offset; + } + return -1; +} + + +#if !defined(XFree86Server) && !defined(XGLServer) +#ifdef USE_X86_ASM + +#if defined( GLX_USE_TLS ) +extern GLubyte gl_dispatch_functions_start[]; +extern GLubyte gl_dispatch_functions_end[]; +#else +extern const GLubyte gl_dispatch_functions_start[]; +#endif + +#endif /* USE_X86_ASM */ + + +/** + * Return dispatch function address for the named static (built-in) function. + * Return NULL if function not found. + */ +static _glapi_proc +get_static_proc_address(const char *funcName) +{ + const glprocs_table_t * const f = find_entry( funcName ); + if (f) { +#if defined(DISPATCH_FUNCTION_SIZE) && defined(GLX_INDIRECT_RENDERING) + return (f->Address == NULL) + ? (_glapi_proc) (gl_dispatch_functions_start + + (DISPATCH_FUNCTION_SIZE * f->Offset)) + : f->Address; +#elif defined(DISPATCH_FUNCTION_SIZE) + return (_glapi_proc) (gl_dispatch_functions_start + + (DISPATCH_FUNCTION_SIZE * f->Offset)); +#else + return f->Address; +#endif + } + else { + return NULL; + } +} + +#endif /* !defined(XFree86Server) && !defined(XGLServer) */ + + + +/** + * Return the name of the function at the given offset in the dispatch + * table. For debugging only. + */ +static const char * +get_static_proc_name( GLuint offset ) +{ + GLuint i; + for (i = 0; static_functions[i].Name_offset >= 0; i++) { + if (static_functions[i].Offset == offset) { + return gl_string_table + static_functions[i].Name_offset; + } + } + return NULL; +} + + + +/********************************************************************** + * Extension function management. + */ + + +/** + * Track information about a function added to the GL API. + */ +struct _glapi_function { + /** + * Name of the function. + */ + const char * name; + + + /** + * Text string that describes the types of the parameters passed to the + * named function. Parameter types are converted to characters using the + * following rules: + * - 'i' for \c GLint, \c GLuint, and \c GLenum + * - 'p' for any pointer type + * - 'f' for \c GLfloat and \c GLclampf + * - 'd' for \c GLdouble and \c GLclampd + */ + const char * parameter_signature; + + + /** + * Offset in the dispatch table where the pointer to the real function is + * located. If the driver has not requested that the named function be + * added to the dispatch table, this will have the value ~0. + */ + unsigned dispatch_offset; + + + /** + * Pointer to the dispatch stub for the named function. + * + * \todo + * The semantic of this field should be changed slightly. Currently, it + * is always expected to be non-\c NULL. However, it would be better to + * only allocate the entry-point stub when the application requests the + * function via \c glXGetProcAddress. This would save memory for all the + * functions that the driver exports but that the application never wants + * to call. + */ + _glapi_proc dispatch_stub; +}; + + +static struct _glapi_function ExtEntryTable[MAX_EXTENSION_FUNCS]; +static GLuint NumExtEntryPoints = 0; + +#ifdef USE_SPARC_ASM +extern void __glapi_sparc_icache_flush(unsigned int *); +#endif + +/** + * Generate a dispatch function (entrypoint) which jumps through + * the given slot number (offset) in the current dispatch table. + * We need assembly language in order to accomplish this. + */ +static _glapi_proc +generate_entrypoint(GLuint functionOffset) +{ +#if defined(USE_X86_ASM) + /* 32 is chosen as something of a magic offset. For x86, the dispatch + * at offset 32 is the first one where the offset in the + * "jmp OFFSET*4(%eax)" can't be encoded in a single byte. + */ + const GLubyte * const template_func = gl_dispatch_functions_start + + (DISPATCH_FUNCTION_SIZE * 32); + GLubyte * const code = (GLubyte *) malloc(DISPATCH_FUNCTION_SIZE); + + + if ( code != NULL ) { + (void) memcpy(code, template_func, DISPATCH_FUNCTION_SIZE); + fill_in_entrypoint_offset( (_glapi_proc) code, functionOffset ); + } + + return (_glapi_proc) code; +#elif defined(USE_SPARC_ASM) + +#ifdef __arch64__ + static const unsigned int insn_template[] = { + 0x05000000, /* sethi %uhi(_glapi_Dispatch), %g2 */ + 0x03000000, /* sethi %hi(_glapi_Dispatch), %g1 */ + 0x8410a000, /* or %g2, %ulo(_glapi_Dispatch), %g2 */ + 0x82106000, /* or %g1, %lo(_glapi_Dispatch), %g1 */ + 0x8528b020, /* sllx %g2, 32, %g2 */ + 0xc2584002, /* ldx [%g1 + %g2], %g1 */ + 0x05000000, /* sethi %hi(8 * glapioffset), %g2 */ + 0x8410a000, /* or %g2, %lo(8 * glapioffset), %g2 */ + 0xc6584002, /* ldx [%g1 + %g2], %g3 */ + 0x81c0c000, /* jmpl %g3, %g0 */ + 0x01000000 /* nop */ + }; +#else + static const unsigned int insn_template[] = { + 0x03000000, /* sethi %hi(_glapi_Dispatch), %g1 */ + 0xc2006000, /* ld [%g1 + %lo(_glapi_Dispatch)], %g1 */ + 0xc6006000, /* ld [%g1 + %lo(4*glapioffset)], %g3 */ + 0x81c0c000, /* jmpl %g3, %g0 */ + 0x01000000 /* nop */ + }; +#endif /* __arch64__ */ + unsigned int *code = (unsigned int *) malloc(sizeof(insn_template)); + unsigned long glapi_addr = (unsigned long) &_glapi_Dispatch; + if (code) { + memcpy(code, insn_template, sizeof(insn_template)); + +#ifdef __arch64__ + code[0] |= (glapi_addr >> (32 + 10)); + code[1] |= ((glapi_addr & 0xffffffff) >> 10); + __glapi_sparc_icache_flush(&code[0]); + code[2] |= ((glapi_addr >> 32) & ((1 << 10) - 1)); + code[3] |= (glapi_addr & ((1 << 10) - 1)); + __glapi_sparc_icache_flush(&code[2]); + code[6] |= ((functionOffset * 8) >> 10); + code[7] |= ((functionOffset * 8) & ((1 << 10) - 1)); + __glapi_sparc_icache_flush(&code[6]); +#else + code[0] |= (glapi_addr >> 10); + code[1] |= (glapi_addr & ((1 << 10) - 1)); + __glapi_sparc_icache_flush(&code[0]); + code[2] |= (functionOffset * 4); + __glapi_sparc_icache_flush(&code[2]); +#endif /* __arch64__ */ + } + return (_glapi_proc) code; +#else + (void) functionOffset; + return NULL; +#endif /* USE_*_ASM */ +} + + +/** + * This function inserts a new dispatch offset into the assembly language + * stub that was generated with the preceeding function. + */ +static void +fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset) +{ +#if defined(USE_X86_ASM) + GLubyte * const code = (GLubyte *) entrypoint; + +#if DISPATCH_FUNCTION_SIZE == 32 + *((unsigned int *)(code + 11)) = 4 * offset; + *((unsigned int *)(code + 22)) = 4 * offset; +#elif DISPATCH_FUNCTION_SIZE == 16 && defined( GLX_USE_TLS ) + *((unsigned int *)(code + 8)) = 4 * offset; +#elif DISPATCH_FUNCTION_SIZE == 16 + *((unsigned int *)(code + 7)) = 4 * offset; +#else +# error Invalid DISPATCH_FUNCTION_SIZE! +#endif + +#elif defined(USE_SPARC_ASM) + + /* XXX this hasn't been tested! */ + unsigned int *code = (unsigned int *) entrypoint; +#ifdef __arch64__ + code[6] = 0x05000000; /* sethi %hi(8 * glapioffset), %g2 */ + code[7] = 0x8410a000; /* or %g2, %lo(8 * glapioffset), %g2 */ + code[6] |= ((offset * 8) >> 10); + code[7] |= ((offset * 8) & ((1 << 10) - 1)); + __glapi_sparc_icache_flush(&code[6]); +#else /* __arch64__ */ + code[2] = 0xc6006000; /* ld [%g1 + %lo(4*glapioffset)], %g3 */ + code[2] |= (offset * 4); + __glapi_sparc_icache_flush(&code[2]); +#endif /* __arch64__ */ + +#else + + /* an unimplemented architecture */ + (void) entrypoint; + (void) offset; + +#endif /* USE_*_ASM */ +} + + +/** + * Generate new entrypoint + * + * Use a temporary dispatch offset of ~0 (i.e. -1). Later, when the driver + * calls \c _glapi_add_dispatch we'll put in the proper offset. If that + * never happens, and the user calls this function, he'll segfault. That's + * what you get when you try calling a GL function that doesn't really exist. + * + * \param funcName Name of the function to create an entry-point for. + * + * \sa _glapi_add_entrypoint + */ + +static struct _glapi_function * +add_function_name( const char * funcName ) +{ + struct _glapi_function * entry = NULL; + + if (NumExtEntryPoints < MAX_EXTENSION_FUNCS) { + _glapi_proc entrypoint = generate_entrypoint(~0); + if (entrypoint != NULL) { + entry = & ExtEntryTable[NumExtEntryPoints]; + + ExtEntryTable[NumExtEntryPoints].name = str_dup(funcName); + ExtEntryTable[NumExtEntryPoints].parameter_signature = NULL; + ExtEntryTable[NumExtEntryPoints].dispatch_offset = ~0; + ExtEntryTable[NumExtEntryPoints].dispatch_stub = entrypoint; + NumExtEntryPoints++; + } + } + + return entry; +} + + +/** + * Fill-in the dispatch stub for the named function. + * + * This function is intended to be called by a hardware driver. When called, + * a dispatch stub may be created created for the function. A pointer to this + * dispatch function will be returned by glXGetProcAddress. + * + * \param function_names Array of pointers to function names that should + * share a common dispatch offset. + * \param parameter_signature String representing the types of the parameters + * passed to the named function. Parameter types + * are converted to characters using the following + * rules: + * - 'i' for \c GLint, \c GLuint, and \c GLenum + * - 'p' for any pointer type + * - 'f' for \c GLfloat and \c GLclampf + * - 'd' for \c GLdouble and \c GLclampd + * + * \returns + * The offset in the dispatch table of the named function. A pointer to the + * driver's implementation of the named function should be stored at + * \c dispatch_table[\c offset]. + * + * \sa glXGetProcAddress + * + * \warning + * This function can only handle up to 8 names at a time. As far as I know, + * the maximum number of names ever associated with an existing GL function is + * 4 (\c glPointParameterfSGIS, \c glPointParameterfEXT, + * \c glPointParameterfARB, and \c glPointParameterf), so this should not be + * too painful of a limitation. + * + * \todo + * Determine whether or not \c parameter_signature should be allowed to be + * \c NULL. It doesn't seem like much of a hardship for drivers to have to + * pass in an empty string. + * + * \todo + * Determine if code should be added to reject function names that start with + * 'glX'. + * + * \bug + * Add code to compare \c parameter_signature with the parameter signature of + * a static function. In order to do that, we need to find a way to \b get + * the parameter signature of a static function. + */ + +PUBLIC int +_glapi_add_dispatch( const char * const * function_names, + const char * parameter_signature ) +{ + static int next_dynamic_offset = _gloffset_FIRST_DYNAMIC; + const char * const real_sig = (parameter_signature != NULL) + ? parameter_signature : ""; + struct _glapi_function * entry[8]; + GLboolean is_static[8]; + unsigned i; + unsigned j; + int offset = ~0; + int new_offset; + + + (void) memset( is_static, 0, sizeof( is_static ) ); + (void) memset( entry, 0, sizeof( entry ) ); + + for ( i = 0 ; function_names[i] != NULL ; i++ ) { + /* Do some trivial validation on the name of the function. + */ + + if (!function_names[i] || function_names[i][0] != 'g' || function_names[i][1] != 'l') + return GL_FALSE; + + /* Determine if the named function already exists. If the function does + * exist, it must have the same parameter signature as the function + * being added. + */ + + new_offset = get_static_proc_offset(function_names[i]); + if (new_offset >= 0) { + /* FIXME: Make sure the parameter signatures match! How do we get + * FIXME: the parameter signature for static functions? + */ + + if ( (offset != ~0) && (new_offset != offset) ) { + return -1; + } + + is_static[i] = GL_TRUE; + offset = new_offset; + } + + + for ( j = 0 ; j < NumExtEntryPoints ; j++ ) { + if (strcmp(ExtEntryTable[j].name, function_names[i]) == 0) { + /* The offset may be ~0 if the function name was added by + * glXGetProcAddress but never filled in by the driver. + */ + + if (ExtEntryTable[j].dispatch_offset != ~0) { + if (strcmp(real_sig, ExtEntryTable[j].parameter_signature) + != 0) { + return -1; + } + + if ( (offset != ~0) && (ExtEntryTable[j].dispatch_offset != offset) ) { + return -1; + } + + offset = ExtEntryTable[j].dispatch_offset; + } + + entry[i] = & ExtEntryTable[j]; + break; + } + } + } + + if (offset == ~0) { + offset = next_dynamic_offset; + next_dynamic_offset++; + } + + for ( i = 0 ; function_names[i] != NULL ; i++ ) { + if (! is_static[i] ) { + if (entry[i] == NULL) { + entry[i] = add_function_name( function_names[i] ); + if (entry[i] == NULL) { + /* FIXME: Possible memory leak here. + */ + return -1; + } + } + + entry[i]->parameter_signature = str_dup(real_sig); + fill_in_entrypoint_offset(entry[i]->dispatch_stub, offset); + entry[i]->dispatch_offset = offset; + } + } + + return offset; +} + + +/** + * Return offset of entrypoint for named function within dispatch table. + */ +PUBLIC GLint +_glapi_get_proc_offset(const char *funcName) +{ + /* search extension functions first */ + GLuint i; + for (i = 0; i < NumExtEntryPoints; i++) { + if (strcmp(ExtEntryTable[i].name, funcName) == 0) { + return ExtEntryTable[i].dispatch_offset; + } + } + /* search static functions */ + return get_static_proc_offset(funcName); +} + + + +/** + * Return pointer to the named function. If the function name isn't found + * in the name of static functions, try generating a new API entrypoint on + * the fly with assembly language. + */ +_glapi_proc +_glapi_get_proc_address(const char *funcName) +{ + struct _glapi_function * entry; + GLuint i; + +#ifdef MANGLE + if (funcName[0] != 'm' || funcName[1] != 'g' || funcName[2] != 'l') + return NULL; +#else + if (funcName[0] != 'g' || funcName[1] != 'l') + return NULL; +#endif + + /* search extension functions first */ + for (i = 0; i < NumExtEntryPoints; i++) { + if (strcmp(ExtEntryTable[i].name, funcName) == 0) { + return ExtEntryTable[i].dispatch_stub; + } + } + +#if !defined( XFree86Server ) && !defined( XGLServer ) + /* search static functions */ + { + const _glapi_proc func = get_static_proc_address(funcName); + if (func) + return func; + } +#endif /* !defined( XFree86Server ) */ + + entry = add_function_name(funcName); + return (entry == NULL) ? NULL : entry->dispatch_stub; +} + + + +/** + * Return the name of the function at the given dispatch offset. + * This is only intended for debugging. + */ +const char * +_glapi_get_proc_name(GLuint offset) +{ + GLuint i; + const char * n; + + /* search built-in functions */ + n = get_static_proc_name(offset); + if ( n != NULL ) { + return n; + } + + /* search added extension functions */ + for (i = 0; i < NumExtEntryPoints; i++) { + if (ExtEntryTable[i].dispatch_offset == offset) { + return ExtEntryTable[i].name; + } + } + return NULL; +} |