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/**************************************************************************
*
* Copyright 2009 VMware, Inc.
* 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, sub license, 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 (including the
* next paragraph) 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 NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
*
**************************************************************************/
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "sl_pp_context.h"
#include "sl_pp_process.h"
#include "sl_pp_public.h"
#include "sl_pp_token.h"
/**
* Declare an extension to the preprocessor. This tells the preprocessor
* which extensions are supported by Mesa.
* The shader still needs to have a "#extension name: behavior" line to enable
* the extension.
*/
int
sl_pp_context_add_extension(struct sl_pp_context *context,
const char *name)
{
struct sl_pp_extension ext;
if (context->num_extensions == SL_PP_MAX_EXTENSIONS) {
return -1;
}
ext.name = sl_pp_context_add_unique_str(context, name);
if (ext.name == -1) {
return -1;
}
context->extensions[context->num_extensions++] = ext;
assert(context->num_extensions <= sizeof(context->extensions));
return 0;
}
/**
* Process a "#extension name: behavior" directive.
*/
int
sl_pp_process_extension(struct sl_pp_context *context,
const struct sl_pp_token_info *input,
unsigned int first,
unsigned int last,
struct sl_pp_process_state *state)
{
int extension_name = -1;
int behavior = -1;
struct sl_pp_token_info out;
/* Grab the extension name. */
if (first < last && input[first].token == SL_PP_IDENTIFIER) {
extension_name = input[first].data.identifier;
first++;
}
if (extension_name == -1) {
strcpy(context->error_msg, "expected identifier after `#extension'");
return -1;
}
/* Make sure the extension is supported. */
if (extension_name == context->dict.all) {
out.data.extension = extension_name;
} else {
unsigned int i;
out.data.extension = -1;
for (i = 0; i < context->num_extensions; i++) {
if (extension_name == context->extensions[i].name) {
out.data.extension = extension_name;
break;
}
}
}
/* Grab the colon separating the extension name and behavior. */
while (first < last && input[first].token == SL_PP_WHITESPACE) {
first++;
}
if (first < last && input[first].token == SL_PP_COLON) {
first++;
} else {
strcpy(context->error_msg, "expected `:' after extension name");
return -1;
}
while (first < last && input[first].token == SL_PP_WHITESPACE) {
first++;
}
/* Grab the behavior name. */
if (first < last && input[first].token == SL_PP_IDENTIFIER) {
behavior = input[first].data.identifier;
first++;
}
if (behavior == -1) {
strcpy(context->error_msg, "expected identifier after `:'");
return -1;
}
if (behavior == context->dict.require) {
if (out.data.extension == -1) {
strcpy(context->error_msg, "the required extension is not supported");
return -1;
}
if (out.data.extension == context->dict.all) {
strcpy(context->error_msg, "invalid behavior for `all' extension: `require'");
return -1;
}
out.token = SL_PP_EXTENSION_REQUIRE;
} else if (behavior == context->dict.enable) {
if (out.data.extension == -1) {
/* Warning: the extension cannot be enabled. */
return 0;
}
if (out.data.extension == context->dict.all) {
strcpy(context->error_msg, "invalid behavior for `all' extension: `enable'");
return -1;
}
out.token = SL_PP_EXTENSION_ENABLE;
} else if (behavior == context->dict.warn) {
if (out.data.extension == -1) {
/* Warning: the extension is not supported. */
return 0;
}
out.token = SL_PP_EXTENSION_WARN;
} else if (behavior == context->dict.disable) {
if (out.data.extension == -1) {
/* Warning: the extension is not supported. */
return 0;
}
out.token = SL_PP_EXTENSION_DISABLE;
} else {
strcpy(context->error_msg, "unrecognised behavior name");
return -1;
}
/* Grab the end of line. */
while (first < last && input[first].token == SL_PP_WHITESPACE) {
first++;
}
if (first < last) {
strcpy(context->error_msg, "expected end of line after behavior name");
return -1;
}
if (sl_pp_process_out(state, &out)) {
return -1;
}
return 0;
}
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