Use #defines to shrink the size of gl_generated_dispatch.c

I was running into file size limits with win32 debug symbols.

2 files changed, 108 insertions, 75 deletions

diff --git a/src/dispatch_common.h b/src/dispatch_common.h
index a0722ff..aa8d04e 100644
--- a/src/dispatch_common.h
+++ b/src/dispatch_common.h
@@ -27,15 +27,18 @@
 #define PLATFORM_HAS_EGL 0
 #define PLATFORM_HAS_GLX 0
 #define PLATFORM_HAS_WGL 1
-#define EPOXYAPIENTRY __declspec(dllexport) __stdcall
+#define EPOXYCALL __stdcall
+#define EPOXYAPIENTRY __declspec(dllexport) EPOXYCALL
 #elif defined(__APPLE__)
 #define PLATFORM_HAS_EGL 0
 #define PLATFORM_HAS_GLX 1
 #define PLATFORM_HAS_WGL 0
+#define EPOXYCALL
 #else
 #define PLATFORM_HAS_EGL 1
 #define PLATFORM_HAS_GLX 1
 #define PLATFORM_HAS_WGL 0
+#define EPOXYCALL
 #endif
 
 #include "epoxy/gl.h"
@@ -73,6 +76,76 @@
 #define WRAPPER_VISIBILITY static GLAPIENTRY
 #define WRAPPER(x) x ## _wrapped
 
+#if USING_DISPATCH_TABLE
+#define GEN_GLOBAL_REWRITE_PTR(name, args, passthrough)
+#define GEN_GLOBAL_REWRITE_PTR_RET(ret, name, args, passthrough)
+
+#define GEN_DISPATCH_TABLE_REWRITE_PTR(name, args, passthrough)            \
+    static EPOXYCALL void                                                  \
+    name##_dispatch_table_rewrite_ptr args                                 \
+    {                                                                      \
+        struct dispatch_table *dispatch_table = get_dispatch_table();      \
+                                                                           \
+        dispatch_table->name = (void *)name##_resolver();                  \
+        dispatch_table->name passthrough;                                  \
+    }
+
+#define GEN_DISPATCH_TABLE_REWRITE_PTR_RET(ret, name, args, passthrough)   \
+    static EPOXYCALL ret                                                   \
+    name##_dispatch_table_rewrite_ptr args                                 \
+    {                                                                      \
+        struct dispatch_table *dispatch_table = get_dispatch_table();      \
+                                                                           \
+        dispatch_table->name = (void *)name##_resolver();                  \
+        return dispatch_table->name passthrough;                           \
+    }
+
+#define GEN_DISPATCH_TABLE_THUNK(name, args, passthrough)                  \
+    static EPOXYCALL void                                                  \
+    name##_dispatch_table_thunk args                                       \
+    {                                                                      \
+        get_dispatch_table()->name passthrough;                            \
+    }
+
+#define GEN_DISPATCH_TABLE_THUNK_RET(ret, name, args, passthrough)         \
+    static EPOXYCALL ret                                                   \
+    name##_dispatch_table_thunk args                                       \
+    {                                                                      \
+        return get_dispatch_table()->name passthrough;                     \
+    }
+
+#else
+#define GEN_GLOBAL_REWRITE_PTR(name, args, passthrough)          \
+    static EPOXYCALL void                                        \
+    name##_global_rewrite_ptr args                               \
+    {                                                            \
+        name = (void *)name##_resolver();                        \
+        name passthrough;                                        \
+    }
+
+#define GEN_GLOBAL_REWRITE_PTR_RET(ret, name, args, passthrough) \
+    static EPOXYCALL ret                                         \
+    name##_global_rewrite_ptr args                               \
+    {                                                            \
+        name = (void *)name##_resolver();                        \
+        return name passthrough;                                 \
+    }
+#define GEN_DISPATCH_TABLE_REWRITE_PTR(name, args, passthrough)
+#define GEN_DISPATCH_TABLE_REWRITE_PTR_RET(ret, name, args, passthrough)
+#define GEN_DISPATCH_TABLE_THUNK(name, args, passthrough)
+#define GEN_DISPATCH_TABLE_THUNK_RET(ret, name, args, passthrough)
+#endif
+
+#define GEN_THUNKS(name, args, passthrough)                          \
+    GEN_GLOBAL_REWRITE_PTR(name, args, passthrough)                  \
+    GEN_DISPATCH_TABLE_REWRITE_PTR(name, args, passthrough)          \
+    GEN_DISPATCH_TABLE_THUNK(name, args, passthrough)
+
+#define GEN_THUNKS_RET(ret, name, args, passthrough)                 \
+    GEN_GLOBAL_REWRITE_PTR_RET(ret, name, args, passthrough)         \
+    GEN_DISPATCH_TABLE_REWRITE_PTR_RET(ret, name, args, passthrough) \
+    GEN_DISPATCH_TABLE_THUNK_RET(ret, name, args, passthrough)
+
 void *epoxy_egl_dlsym(const char *name);
 void *epoxy_glx_dlsym(const char *name);
 void *epoxy_gl_dlsym(const char *name);
@@ -96,16 +169,22 @@ void epoxy_print_failure_reasons(const char *name,
 
 bool epoxy_extension_in_string(const char *extension_list, const char *ext);
 
-extern void UNWRAPPED_PROTO(epoxy_glBegin_unwrapped)(GLenum primtype);
-extern void UNWRAPPED_PROTO(epoxy_glEnd_unwrapped)(void);
+#define glBegin_unwrapped epoxy_glBegin_unwrapped
+#define glEnd_unwrapped epoxy_glEnd_unwrapped
+extern void UNWRAPPED_PROTO(glBegin_unwrapped)(GLenum primtype);
+extern void UNWRAPPED_PROTO(glEnd_unwrapped)(void);
 
 #if USING_DISPATCH_TABLE
 void gl_init_dispatch_table(void);
 void wgl_init_dispatch_table(void);
 extern uint32_t gl_tls_index, gl_tls_size;
 extern uint32_t wgl_tls_index, wgl_tls_size;
-extern BOOL UNWRAPPED_PROTO(epoxy_wglMakeCurrent_unwrapped)(HDC hdc, HGLRC hglrc);
-extern BOOL UNWRAPPED_PROTO(epoxy_wglMakeContextCurrentARB_unwrapped)(HDC hDrawDC, HDC hReadDC, HGLRC hglrc);
-extern BOOL UNWRAPPED_PROTO(epoxy_wglMakeContextCurrentEXT_unwrapped)(HDC hDrawDC, HDC hReadDC, HGLRC hglrc);
-extern BOOL UNWRAPPED_PROTO(epoxy_wglMakeAssociatedContextCurrentAMD_unwrapped)(HGLRC hglrc);
+#define wglMakeCurrent_unwrapped epoxy_wglMakeCurrent_unwrapped
+#define wglMakeContextCurrentARB_unwrapped epoxy_wglMakeContextCurrentARB_unwrapped
+#define wglMakeContextCurrentEXT_unwrapped epoxy_wglMakeContextCurrentEXT_unwrapped
+#define wglMakeAssociatedContextCurrentAMD_unwrapped epoxy_wglMakeAssociatedContextCurrentAMD_unwrapped
+extern BOOL UNWRAPPED_PROTO(wglMakeCurrent_unwrapped)(HDC hdc, HGLRC hglrc);
+extern BOOL UNWRAPPED_PROTO(wglMakeContextCurrentARB_unwrapped)(HDC hDrawDC, HDC hReadDC, HGLRC hglrc);
+extern BOOL UNWRAPPED_PROTO(wglMakeContextCurrentEXT_unwrapped)(HDC hDrawDC, HDC hReadDC, HGLRC hglrc);
+extern BOOL UNWRAPPED_PROTO(wglMakeAssociatedContextCurrentAMD_unwrapped)(HGLRC hglrc);
 #endif
diff --git a/src/gen_dispatch.py b/src/gen_dispatch.py
index aee4308..5af23d6 100755
--- a/src/gen_dispatch.py
+++ b/src/gen_dispatch.py
@@ -535,7 +535,7 @@ class Generator(object):
 
     def write_function_ptr_resolver(self, func):
         self.outln('static {0}'.format(func.ptr_type))
-        self.outln('epoxy_{0}_resolver(void)'.format(func.name))
+        self.outln('epoxy_{0}_resolver(void)'.format(func.wrapped_name))
         self.outln('{')
 
         providers = []
@@ -594,70 +594,27 @@ class Generator(object):
         self.outln('}')
         self.outln('')
 
-    def write_dispatch_table_thunk(self, func):
-        # Writes out the thunk that fetches the (win32) dispatch table
-        # and calls through its entrypoint.
-
-        dispatch_table_entry = 'dispatch_table->p{0}'.format(func.name)
-
-        self.outln('static __stdcall {0}'.format(func.ret_type))
-        self.outln('epoxy_{0}_dispatch_table_thunk({1})'.format(func.wrapped_name, func.args_decl))
-        self.outln('{')
-        self.outln('    struct dispatch_table *dispatch_table = get_dispatch_table();')
-        self.outln('')
-        if func.ret_type == 'void':
-            self.outln('    {0}({1});'.format(dispatch_table_entry, func.args_list))
-        else:
-            self.outln('    return {0}({1});'.format(dispatch_table_entry, func.args_list))
-        self.outln('}')
-        self.outln('')
-
-    def write_dispatch_table_rewrite_stub(self, func):
-        # Writes out the initial dispatch table function pointer value
-        # that that resolves, writes the resolved value into the
-        # dispatch table, and calls down to it.
-
-        dispatch_table_entry = 'dispatch_table->p{0}'.format(func.name)
-
-        self.outln('static GLAPIENTRY {0}'.format(func.ret_type))
-        self.outln('epoxy_{0}_rewrite_stub({1})'.format(func.name, func.args_decl))
-        self.outln('{')
-        self.outln('    struct dispatch_table *dispatch_table = get_dispatch_table();')
-        self.outln('')
-        self.outln('    dispatch_table->p{0} = epoxy_{0}_resolver();'.format(func.name))
-        self.outln('')
-
+    def write_thunks(self, func):
+        # Writes out the function that's initially plugged into the
+        # global function pointer, which resolves, updates the global
+        # function pointer, and calls down to it.
+        #
+        # It also writes out the actual initialized global function
+        # pointer.
         if func.ret_type == 'void':
-            self.outln('    dispatch_table->p{0}({1});'.format(func.name, func.args_list))
+            self.outln('GEN_THUNKS({0}, ({1}), ({2}))'.format(func.wrapped_name,
+                                                              func.args_decl,
+                                                              func.args_list))
         else:
-            self.outln('    return dispatch_table->p{0}({1});'.format(func.name, func.args_list))
-        self.outln('}')
-        self.outln('')
+            self.outln('GEN_THUNKS_RET({0}, {1}, ({2}), ({3}))'.format(func.ret_type,
+                                                                       func.wrapped_name,
+                                                                       func.args_decl,
+                                                                       func.args_list))
 
     def write_linux_function_pointer(self, func):
-        # Writes out the function for resolving and updating the
-        # global function pointer, plus the actual global function
-        # pointer initializer.
-
-        self.outln('static {0}'.format(func.ret_type))
-        self.outln('epoxy_{0}_rewrite_ptr({1})'.format(func.wrapped_name,
-                                                       func.args_decl))
-        self.outln('{')
-        self.outln('    epoxy_{0} = (void *)epoxy_{1}_resolver();'.format(func.wrapped_name,
-                                                                          func.name))
-
-        if func.ret_type == 'void':
-            self.outln('    epoxy_{0}({1});'.format(func.wrapped_name,
-                                                    func.args_list))
-        else:
-            self.outln('    return epoxy_{0}({1});'.format(func.wrapped_name,
-                                                           func.args_list))
-
-        self.outln('}')
-
-        self.outln('{0}{1} epoxy_{2} = epoxy_{2}_rewrite_ptr;'.format(func.public,
-                                                                      func.ptr_type,
-                                                                      func.wrapped_name))
+        self.outln('{0}{1} epoxy_{2} = epoxy_{2}_global_rewrite_ptr;'.format(func.public,
+                                                                             func.ptr_type,
+                                                                             func.wrapped_name))
         self.outln('')
 
     def write_win32_function_pointer(self, func):
@@ -779,7 +736,7 @@ class Generator(object):
 
         self.outln('struct dispatch_table {')
         for func in self.sorted_functions:
-            self.outln('    {0} p{1};'.format(func.ptr_type, func.name))
+            self.outln('    {0} epoxy_{1};'.format(func.ptr_type, func.wrapped_name))
         self.outln('};')
         self.outln('')
 
@@ -801,17 +758,14 @@ class Generator(object):
         for func in self.sorted_functions:
             self.write_function_ptr_resolver(func)
 
-        self.outln('#if USING_DISPATCH_TABLE')
-
         for func in self.sorted_functions:
-            self.write_dispatch_table_rewrite_stub(func)
+            self.write_thunks(func)
 
-        for func in self.sorted_functions:
-            self.write_dispatch_table_thunk(func)
+        self.outln('#if USING_DISPATCH_TABLE')
 
         self.outln('static struct dispatch_table resolver_table = {')
         for func in self.sorted_functions:
-            self.outln('    .p{0} = epoxy_{0}_rewrite_stub,'.format(func.name))
+            self.outln('    .{0} = epoxy_{0}_dispatch_table_rewrite_ptr,'.format(func.wrapped_name))
         self.outln('};')
         self.outln('')