glsl: Add preprocessor purifier.
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970823978c
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0bbf59c305
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@ -1,6 +1,7 @@
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Import('*')
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Import('*')
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SConscript('gallium/SConscript')
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SConscript('gallium/SConscript')
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SConscript('glsl/pp/SConscript')
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if 'mesa' in env['statetrackers']:
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if 'mesa' in env['statetrackers']:
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SConscript('mesa/SConscript')
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SConscript('mesa/SConscript')
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Import('*')
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if env['platform'] not in ['windows']:
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Return()
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env = env.Clone()
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glsl = env.StaticLibrary(
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target = 'glsl',
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source = [
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'sl_pp_purify.c',
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],
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)
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env = env.Clone()
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if env['platform'] == 'windows':
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env.PrependUnique(LIBS = [
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'user32',
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])
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env.Prepend(LIBS = [glsl])
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@ -0,0 +1,204 @@
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/**************************************************************************
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*
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* Copyright 2009 VMware, Inc.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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#include <stdlib.h>
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#include "sl_pp_purify.h"
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/*
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* Preprocessor purifier performs the following tasks.
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* - Convert all variants of newlines into a Unix newline.
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* - Merge continued lines into a single long line.
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* - Remove line comments and replace block comments with whitespace.
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*/
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static unsigned int
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_purify_newline(const char *input,
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char *out)
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{
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if (input[0] == '\n') {
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*out = '\n';
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if (input[1] == '\r') {
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/*
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* The GLSL spec is not explicit about whether this
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* combination is a valid newline or not.
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* Let's assume it is acceptable.
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*/
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return 2;
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}
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return 1;
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}
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if (input[0] == '\r') {
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*out = '\n';
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if (input[1] == '\n') {
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return 2;
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}
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return 1;
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}
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*out = input[0];
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return 1;
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}
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static unsigned int
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_purify_backslash(const char *input,
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char *out)
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{
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unsigned int eaten = 0;
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for (;;) {
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if (input[0] == '\\') {
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char next;
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unsigned int next_eaten;
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eaten++;
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input++;
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next_eaten = _purify_newline(input, &next);
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if (next == '\n') {
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/*
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* If this is really a line continuation sequence, eat
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* it and do not exit the loop.
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*/
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eaten += next_eaten;
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input += next_eaten;
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} else {
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/*
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* It is an error to put anything between a backslash
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* and a newline and still expect it to behave like a line
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* continuation sequence.
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* Even if it is an innocent whitespace.
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*/
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*out = '\\';
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break;
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}
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} else {
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eaten += _purify_newline(input, out);
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break;
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}
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}
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return eaten;
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}
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static unsigned int
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_purify_comment(const char *input,
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char *out)
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{
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unsigned int eaten;
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char curr;
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eaten = _purify_backslash(input, &curr);
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input += eaten;
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if (curr == '/') {
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char next;
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unsigned int next_eaten;
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next_eaten = _purify_backslash(input, &next);
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if (next == '/') {
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eaten += next_eaten;
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input += next_eaten;
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/* Replace a line comment with either a newline or nil. */
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for (;;) {
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next_eaten = _purify_backslash(input, &next);
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eaten += next_eaten;
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input += next_eaten;
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if (next == '\n' || next == '\0') {
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*out = next;
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return eaten;
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}
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}
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} else if (next == '*') {
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eaten += next_eaten;
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input += next_eaten;
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/* Replace a block comment with a whitespace. */
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for (;;) {
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next_eaten = _purify_backslash(input, &next);
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eaten += next_eaten;
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input += next_eaten;
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while (next == '*') {
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next_eaten = _purify_backslash(input, &next);
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eaten += next_eaten;
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input += next_eaten;
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if (next == '/') {
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*out = ' ';
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return eaten;
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}
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}
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}
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}
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}
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*out = curr;
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return eaten;
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}
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int
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sl_pp_purify(const char *input,
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const struct sl_pp_purify_options *options,
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char **output)
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{
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char *out = NULL;
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unsigned int out_len = 0;
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unsigned int out_max = 0;
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for (;;) {
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char c;
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input += _purify_comment(input, &c);
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if (out_len >= out_max) {
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unsigned int new_max = out_max;
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if (new_max < 0x100) {
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new_max = 0x100;
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} else if (new_max < 0x10000) {
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new_max *= 2;
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} else {
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new_max += 0x10000;
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}
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out = realloc(out, new_max);
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if (!out) {
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return -1;
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}
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out_max = new_max;
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}
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out[out_len++] = c;
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if (c == '\0') {
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break;
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}
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}
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*output = out;
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return 0;
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}
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@ -0,0 +1,41 @@
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/**************************************************************************
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*
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* Copyright 2009 VMware, Inc.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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#ifndef SL_PP_PURIFY_H
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#define SL_PP_PURIFY_H
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struct sl_pp_purify_options {
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unsigned int preserve_columns:1;
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unsigned int tab_width:4;
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};
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int
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sl_pp_purify(const char *input,
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const struct sl_pp_purify_options *options,
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char **output);
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#endif /* SL_PP_PURIFY_H */
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