summaryrefslogtreecommitdiffstats
path: root/src/glsl/glcpp
Commit message (Collapse)AuthorAgeFilesLines
* glcpp: Silence GCC warningIan Romanick2015-02-171-1/+1
| | | | | | | | | glcpp/glcpp.c:124:1: warning: ‘static’ is not at beginning of declaration [-Wold-style-declaration] const static struct option ^ Signed-off-by: Ian Romanick <[email protected]> Reviewed-by: Matt Turner <[email protected]>
* mesa: Add ARB_shader_precision infrastructureMicah Fedke2015-01-191-0/+3
| | | | | Reviewed-by: Ian Romanick <[email protected]> Reviewed-by: Chris Forbes <[email protected]>
* mesa/glsl/glapi: enable GL_EXT_draw_buffers extensionTapani Pälli2015-01-141-0/+1
| | | | | | | | | | | | | | | | Patch enables ES2 extension that utilizes existing ES3 functionality. Changes make all the subtests to run and pass in WebGL conformance test 'webgl-draw-buffers' when running Chrome on OpenGL ES, also Piglit test 'draw_buffers_gles2' passes. v2: remove unused boolean (Ilia Mirkin) v3: proper error checking for invalid values (Chad Versace) v4: run error check explicitly for ES2 and ES3 (Kenneth Graunke) Signed-off-by: Tapani Pälli <[email protected]> Reviewed-by: Matt Turner <[email protected]> Reviewed-by: Chad Versace <[email protected]>
* glcpp: Make tests write .out files to builddir.Matt Turner2014-12-122-7/+14
|
* glcpp: Fix `can not` to `cannot` in error messageChris Forbes2014-12-072-4/+4
| | | | Signed-off-by: Chris Forbes <[email protected]>
* glcpp: Disallow undefining GL_* builtin macros.Chris Forbes2014-12-071-1/+2
| | | | | | | | Fixes the piglit test: spec/glsl-es-3.00/compiler/undef-GL_ES.vert Signed-off-by: Chris Forbes <[email protected]> Reviewed-by: Anuj Phogat <[email protected]> Reviewed-by: Ian Romanick <[email protected]>
* glcpp: Don't use alternation in the lookahead for empty pragmas.Carl Worth2014-08-221-2/+8
| | | | | | | | | | | | | | | | | | | | We've found that there's a buffer overrun bug in flex that's triggered by using alternation in a lookahead pattern. Fortunately, we don't need to match the exact {NEWLINE} expression to detect an empty pragma. It suffices to verify that there are no non-space characters before any newline character. So we can use a simple [\r\n] to get the desired behavior while avoiding the flex bug. Fixes the regression of piglit's 17000-consecutive-chars-identifier test, (which has been crashing since commit 04e40fd337a244ee77ef9553985e9398ff0344af ). Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=82472 Signed-off-by: Carl Worth <[email protected]> Reviewed-by: Kenneth Graunke <[email protected]> CC: <[email protected]>
* glcpp: Fix glcpp-test-cr-lf "make check" test for Mac OS XCarl Worth2014-08-201-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | There were two problems with the way this script used sed on OS X: 1. The OS X sed doesn't interpret "\r" in a replacement list as a carriage-return character, (instead it was inserting a literal 'r' character). We fix this by putting an actual ^M character into the source of the script, (rather than a two-character escape sequence hoping for sed to do the right thing). 2. When generating the test files with LF-CR ("\n\r") newlines, the OS X sed was adding an undesired final newline ("\n") at the end of the file. We avoid this by first using sed to add the ^M before the newlines, then using tr to swap the \r and \n characters. This way, sed never sees any lines ending with anything but \n, so it doesn't get confused and doesn't add any bogus extra newlines. Tested-by: Vinson Lee <[email protected]> Vinson's testing confirmed that this patch fixes FreeBSD as well.
* glcpp: Use printf instead of "echo -n" in glcpp-testCarl Worth2014-08-201-2/+2
| | | | | | | | | | I noticed that with /bin/sh on Mac OS X, "echo -n" does not work as desired, (it actually prints "-n" rather than suppressing the final newline). There is a /bin/echo that could be used (it actually works) instead of the builtin echo. But I decided it's more robust to just use printf rather than hardcoding /bin/echo into the script.
* glsl: add ARB_derivative control supportIlia Mirkin2014-08-141-0/+3
| | | | | | | Signed-off-by: Ilia Mirkin <[email protected]> Reviewed-by: Matt Turner <[email protected]> Reviewed-by: Chris Forbes <[email protected]> Reviewed-by: Ian Romanick <[email protected]>
* glsl/glcpp: Rename one test to avoid a duplicate test numberCarl Worth2014-08-072-0/+0
| | | | | | | | | | | With two tests both numbered 118, there was a confusing off-by-two difference between the last test number and the total number of tests (as reported by glcpp-test). With this rename, there's only an off-by-one difference left, (which is easy to understand given the zero-based test numbering). Reviewed-by: Ian Romanick <[email protected]>
* glsl/glcpp: Fix handling of commas that result from macro expansionCarl Worth2014-08-073-12/+45
| | | | | | | | | | | | | | | | | | | | | | | | Here is some additional stress testing of nested macros where the expansion of macros involves commas, (and whether those commas are interpreted as argument separators or not in subsequent function-like macro calls). Credit to the GCC documentation that directed my attention toward this issue: https://gcc.gnu.org/onlinedocs/gcc-3.2/cpp/Argument-Prescan.html Fixing the bug required only removing code from glcpp. When first testing the details of expansions involving commas, I had come to the mistaken conclusion that an expanded comma should never be treated as an argument separator, (so had introduced the rather ugly COMMA_FINAL token to represent this). In fact, an expanded comma should be treated as a separator, (as tested here), and this treatment can be avoided by judicious use of parentheses (as also tested here). With this simple removal of the COMMA_FINAL token, the behavior of glcpp matches that of gcc's preprocessor for all of these hairy cases. Reviewed-by: Ian Romanick <[email protected]>
* glsl/glcpp: Integrate recent glcpp-test-cr-lf test into "make check"Carl Worth2014-08-072-13/+37
| | | | | | | | | | | | Beyond just listing this in the TESTS variable in Makefile.am, only minor changes were needed to make this work. The primary issue is that the build system runs the test script from a different directory than the script itself. So we have to use the $srcdir variable to find the test input files. Using $srcdir in this way also ensures that this test works when using an out-of-tree build. Reviewed-by: Ian Romanick <[email protected]>
* glsl/glcpp: Fix glcpp-test to correctly extract test-specific argumentsCarl Worth2014-08-071-1/+1
| | | | | | | | | | | | | | | | | | | | | The (optional) test-specific command-line arguments to be passed to glcpp are embedded within the source files of some tests, and glcpp-test uses grep to extract them. Of course, grep is line-based and looks for the native line-separator to determine line boundaries. So, for files using non-native line separators, grep was getting quite confused and passing bogus arguments to glcpp. Fix this by canonical-izing the line separators in the source file prior to using grep. With this commit, the glcpp-test-cr-lf tests pass entirely: \r: 143/143 tests pass \r\n: 143/143 tests pass \n\r: 143/143 tests pass Reviewed-by: Ian Romanick <[email protected]>
* glsl/glcpp: Fix line-continuation code to handle multiple newline flavorsCarl Worth2014-08-071-9/+87
| | | | | | | | | | | | | | | | | | | | | | | | | Sometimes the newline separator is a single character, and sometimes it is two characters. Before we can fold away and line-continuation backslashes, we identify the flavor of line separator that is in use. With this identified, we then correctly search for backslashes followed immediately by the first character of the line separator. Also, when re-inserting newlines to replace collapsed newlines, we carefully insert newlines of the same flavor. With this commit, almost all remaining test are fixed as tested by glcpp-test-cr-lf: \r: 142/143 tests pass \r\n: 142/143 tests pass \n\r: 143/143 tests pass (The only remaining failures have nothing to do with the actual pre-processor code, but are due to a bug in the way the test suite uses grep to try to extract test-specific command-line options from the source files.) Reviewed-by: Ian Romanick <[email protected]>
* glsl/glcpp: Don't include any newline characters in #error tokenCarl Worth2014-08-071-1/+1
| | | | | | | | | | | | | | | | | | Some tests were failing because the message printed by #error was including a '\r' character from the source file in its output. This is easily avoided by fixing the regular expression for #error to never include any of the possible newline characters, (neither '\r' nor '\n'). With this commit 2 tests are fixed for each of the '\r' and '\r\n' cases. Current results after the commit are: \r: 137/143 tests pass \r\n 142/143 tests pass \n\r: 139/143 tests pass Reviewed-by: Ian Romanick <[email protected]>
* glsl/glcpp: Treat CR+LF pair as a single newlineCarl Worth2014-08-072-5/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | The GLSL specification says that either carriage-return, line-feed, or both together can be used to terminate lines. Further, it says that when used together, the pair of terminators shall be interpreted as a single line. This final requirement has not been respected by glcpp up until now, (it has been emitting two newlines for every CR+LF pair). Here, we fix the lexer by using a regular expression for NEWLINE that eats up both "\r\n" (or even "\n\r") if possible before also considering a single '\n' or a single '\r' as a line terminator. Before this commit, the test results are as follows: \r: 135/143 tests pass \r\n: 4/143 tests pass \n\r: 4/143 tests pass After this commit, the test results are as follows: \r: 135/143 tests pass \r\n: 140/143 tests pass \n\r: 139/143 tests pass So, obviously, a dramatic improvement. Reviewed-by: Ian Romanick <[email protected]>
* glsl/glcpp: Add test script for testing various line-termination charactersCarl Worth2014-08-072-11/+137
| | | | | | | | | | | | | | | | | | | | | | The GLSL specification has a very broad definition of what is a newline. Namely, it can be the carriage-return character, '\r', the newline character, '\n', or any combination of the two, (though in combination, the two are treated as a single newline). Here, we add a new test-runner, glcpp-test-cr-lf, that, for each possible line-termination combination, runs through the existing test suite with all source files modified to use those line-termination characters. Instead of using the .expected files for this, this script assumes that the regular test suite has been run already and expects the output to match the .out files. This avoids getting 4 test failures for any one bug, and instead will hopefully only report bugs actually related to the line-termination characters. The new testing is not yet integrated into "make check". For that, some munging of the testdir option will be necessary, (to support "make check" with out-of-tree builds). For now, the scripts can just be run directly by hand. Reviewed-by: Ian Romanick <[email protected]>
* glsl/glcpp: Fix for macros that expand to include "defined" operatorsCarl Worth2014-08-073-45/+387
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Prior to this commit, the following snippet would trigger an error in glcpp: #define FOO defined BAR #if FOO #endif The problem was that support for the "defined" operator was implemented within the grammar, (where the parser was parsing the tokens of the condition itself). But what is required is to interpret the "defined" operator that results after macro expansion is performed. I could not find any fix for this case by modifying the grammar alone. The difficulty is that outside of the grammar we already have a recursive function that performs macro expansion (_glcpp_parser_expand_token_list) and that function itself must be augmented to be made aware of the semantics of the "defined" operator. The reason we can't simply handle "defined" outside of the recursive expansion function is that not only must we scan for any "defined" operators in the original condition (before any macro expansion occurs); but at each level of the recursive expansion, we must again scan the list of tokens resulting from expansion and handle "defined" before entering the next level of recursion to further expand macros. And of course, all of this is context dependent. The evaluation of "defined" operators must only happen when we are handling preprocessor conditionals, (#if and #elif) and not when performing any other expansion, (such as in the main body). To implement this, we add a new "mode" parameter to all of the expansion functions to specify whether resulting DEFINED tokens should be evaluated or ignored. One side benefit of this change is that an ugly wart in the grammar is removed. We previously had "conditional_token" and "conditional_tokens" productions that were basically copies of "pp_token" and "pp_tokens" but with added productions for the various forms of DEFINED operators. With the new code here, those ugly copy-and-paste productions are eliminated from the grammar. A new "make check" test is added to stress-test the code here. This commit fixes the following Khronos GLES3 CTS tests: conditional_inclusion.basic_2_vertex conditional_inclusion.basic_2_fragment Reviewed-by: Ian Romanick <[email protected]>
* glsl/glcpp: Swallow empty #pragma directives.Carl Worth2014-08-072-1/+7
| | | | | | | | | | | | | | Previously, we were passing these through, just like any other pragma. But the downstream compiler was tripping up on them. It seems easier to swallow these in the preprocessor and not pass them on at all rather than fixing the downstream compiler. This fixes the following Khronos GLES3 CTS tests: preprocessor.pragmas.pragma_vertex preprocessor.pragmas.pragma_fragment Reviewed-by: Ian Romanick <[email protected]>
* glsl/glcpp: Fix #pragma to not over-increment the line-number countCarl Worth2014-08-073-2/+12
| | | | | | | | | | | | | | Previously, the #pragma directive was swallowing an entire line, (including the final newline). At that time it was appropriate for it to increment the line count. More recently, our handling of #pragma changed to not include the newline. But the code to increment yylineno stuck around. This was causing __LINE__ to be increased by one more than desired for every #pragma. Remove the bogus, extra increment, and add a test for this case. Reviewed-by: Ian Romanick <[email protected]>
* glsl/glcpp: Add testing for null directives with spaces and commentsCarl Worth2014-08-072-0/+18
| | | | | | | | This new "make check" test stresses out the support from the last two commits, (to esnure that '#' is correctly interpreted as the null directives, regardless of any whitespace or comments on the same line). Reviewed-by: Ian Romanick <[email protected]>
* glsl/glcpp: Fix NULL directives when followed by a single-line commentCarl Worth2014-08-071-1/+1
| | | | | | | | | | | | | | | | | | | This is the fix for the following line: # // comment to ignore here According to the translation-phase rules, the comment should be removed before the preprocessor looks to interpret the null directive. So in our implementation we must explicitly look for single-line comments in the <HASH> start condition as well. This commit fixes the following Khronos GLES3 CTS tests: null_directive_vertex null_directive_fragment Reviewed-by: Ian Romanick <[email protected]>
* glsl/glcpp: Add tests for #define followed by commentsCarl Worth2014-08-072-2/+8
| | | | | | | This simply tests the previous commit, (that #define followed by a comment will still generate the expected "#define without macro name" error message). Reviewed-by: Ian Romanick <[email protected]>
* glsl/glcpp: Allow single-line comments immediately after #defineCarl Worth2014-08-071-1/+1
| | | | | | | | | | | | | | | | We were already correctly supporting single-line comments in case like: #define FOO bar // comment here... The new support added here is simply for the none-too-useful: #define // comment instead of macro name With this commit, this line will now give the expected "#define without macro name" error message instead of the lexer just going off into the weeds. Reviewed-by: Ian Romanick <[email protected]>
* glsl/glcpp: Add test for "#define without macro name"Carl Worth2014-08-072-0/+4
| | | | | | | | This ensures that the previous commit indeed generates the expected error message when a "#define" directive is not followed by anything except for a newline. Reviewed-by: Ian Romanick <[email protected]>
* glsl/glcpp: Add explicit error for "#define without macro name"Carl Worth2014-08-073-5/+7
| | | | | | | | | | | | | | | | | | | | | | | | Previously, glcpp would emit an error like this if <EOF> happened to occur immediately after the "#define", but in general would just get confused, (leading to un-helpful error messages). To fix things to generate a clean error message, we do a few things: 1. Don't require horizontal whitespace immediately after #define 2. Add a production for the error case, (DEFINE_TOKEN followed immediately by a NEWLINE token). 3. Make the lexer reset to the <INITIAL> state after every NEWLINE. This 3rd point prevents the lexer from getting so confused and generating further spurious errors in the file because it was stuck in the <DEFINE> start condition. We also drop the similar error message from the <EOF> rule since the newly-added rule will have already printed the error message. Reviewed-by: Ian Romanick <[email protected]>
* util: Move ralloc to a new src/util directory.Kenneth Graunke2014-08-041-1/+1
| | | | | | | | | | | | | | | | | | For a long time, we've wanted a place to put utility code which isn't directly tied to Mesa or Gallium internals. This patch creates a new src/util directory for exactly that purpose, and builds the contents as libmesautil.la. ralloc seemed like a good first candidate. These days, it's directly used by mesa/main, i965, i915, and r300g, so keeping it in src/glsl didn't make much sense. Signed-off-by: Kenneth Graunke <[email protected]> v2 (Jason Ekstrand): More realloc uses and some scons fixes Signed-off-by: Jason Ekstrand <[email protected]> Reviewed-by: Marek Olšák <[email protected]>
* define GL_OES_standard_derivatives if extension is supportedKevin Rogovin2014-08-021-0/+2
| | | | | | | | | Define the macro GL_OES_standard_derivatives as 1 if the extension GL_OES_standard_derivatives is supported. V2 [Chris]: Correct trailing whitespace Reviewed-by: Chris Forbes <[email protected]>
* glsl/glcpp: rename ERROR to ERROR_TOKEN to fix MSVC buildBrian Paul2014-07-302-4/+4
| | | | | | | ERROR is a #define in the MSVC WinGDI.h header file. Add the _TOKEN suffix as we do for a few other lexer tokens. Reviewed-by: Kenneth Graunke <[email protected]>
* glsl/glcpp: Add flex options to eliminate the default rule.Carl Worth2014-07-291-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | We've had multiple bugs in the past where we have been inadvertently matching the default rule, (which we never want to do). We recently added a catch-all rule to avoid this, (and made this rule robust for future start conditions). Kristian pointed out that flex allows us to go one step better. This syntax: %option warn nodefault instructs flex to not generate the default rule at all. Further, flex will generate a warning at compile time if the set of rules we provide are inadequate, (such that it would be possible for the default rule to be matched). With this warning in place, I found that the catch-all rule was in fact missing something. The catch-all rule uses a pattern of "." which doesn't match newlines. So here we extend the newline-matching rule to all start conditions. That is enough to convince flex that it really doesn't need any default rule. Reviewed-by: Kenneth Graunke <[email protected]> Reviewed-by: Kristian Høgsberg <[email protected]>
* glsl/glcpp: Combine the two rules matching any characterCarl Worth2014-07-291-6/+6
| | | | | | | | | | Using a single rule here means that we can use the <*> syntax to match all start conditions. This makes the catch-all rule more robust against the addition of future start conditions, (no need to maintain an ever- growing list of start conditions for this rul). Reviewed-by: Kenneth Graunke <[email protected]> Reviewed-by: Kristian Høgsberg <[email protected]>
* glsl/glcpp: Alphabetize lists of start conditionsCarl Worth2014-07-291-3/+3
| | | | | | | | | | | | There is no behavioral change here. It's just easier to verify that lists of start conditions include all expected conditions when they appear in a consistent order. The <INITIAL> state is special, so it appears first in all lists. All others appear in alphabetical order. Reviewed-by: Kenneth Graunke <[email protected]> Reviewed-by: Kristian Høgsberg <[email protected]>
* glsl/glcpp: Add a catch-all rule for unexpected characters.Carl Worth2014-07-291-0/+13
| | | | | | | | | | | | | | | | | | In some of the recent glcpp bug-fixing, we found that glcpp was emitting unrecognized characters from the input source file to stdout, and dropping them from the source passed onto the compiler proper. This was obviously confusing, and totally undesired. The bogus behavior comes from an implicit default rule in flex, which is that any unmatched character is implicitly matched and printed to stdout. To avoid this implicit matching and printing, here we add an explicit catch-all rule. If this rule ever matches it prints an internal compiler error. The correct response for any such error is fixing glcpp to handle the unexpected character in the correct way. Reviewed-by: Jordan Justen <[email protected]>
* glsl/glcpp: Treat carriage return as equivalent to line feed.Carl Worth2014-07-291-9/+8
| | | | | | | | | | | | | | | | | | | Previously, the '\r' character was not explicitly matched by any lexer rule. This means that glcpp would have been using the default flex rule to match '\r' characters, (where they would have been printed to stdout rather than actually correctly handled). With this commit, we treat '\r' as equivalent to '\n'. This is clearly an improvement the bogus printing to stdout. The resulting behavior is compliant with the GLSL specification for any source file that uses exclusively '\r' or '\n' to separate lines. For shaders that use a multiple-character line separator, (such as "\r\n"), glcpp won't be precisely compliant with the specification, (treating these as two newline characters rather than one), but this should not introduce any semantic changes to the shader programs. Reviewed-by: Jordan Justen <[email protected]>
* glsl/glcpp: Add test for a multi-line comment within an #if 0 blockCarl Worth2014-07-292-0/+14
| | | | | | | | | | | | | | | | | | | This test is written to exercise a bug which I recently wrote, (but fortunately caught and fixed before ever committing it). For the curious: The bug happened when the NEWLINE_CATCHUP code didn't actually return the NEWLINE token (due to the skipping). This resulted in the lexer continuing on through all the subsequent rules while still in the NEWLINE_CATCHUP start condition, (which then triggered the internal-compiler-error catch-all rule). What is intended is for the return of the NEWLINE token to start a new iteration of the lexer loop, at which time the NEWLINE_CATCHUP-handling code will reset from the <NEWLINE_CATCHUP> to the <INITIAL> start condition. Reviewed-by: Jordan Justen <[email protected]>
* glsl/glcpp: Test that macro parameters substitute immediately after periodsCarl Worth2014-07-292-0/+8
| | | | | | | | | | | | At one point while rewriting the lexing rule for pre-processing numbers, I made it a bit too aggressive and within a replacement list sucked up a parameter name that appeared immediately after a period. This caused the parameter name to be unreplaced when the macro was expanded. It was in some piglit tests that I originally found this issue. Here, I'm adding a test to "make check" to ensure that this behavior remains correct. Reviewed-by: Jordan Justen <[email protected]>
* glsl/glcpp: Add (non)-support for ++ and -- operatorsCarl Worth2014-07-294-1/+33
| | | | | | | | | | | | | | | | | | | | | | | | | | | | These operators aren't defined for preprocessor expressions, so we never implemented them. This led them to be misinterpreted as strings of unary '+' or '-' operators. In fact, what is actually desired is to generate an error if these operators appear in any preprocessor condition. So this commit looks like it is strictly adding support for these operators. And it is supporting them as far as passing them through to the subsequent compiler, (which was already happening anyway). What's less apparent in the commit is that with these tokens now being lexed, but with no change to the grammar for preprocessor expressions, these operators will now trigger errors there. A new "make check" test is added to verify the desired behavior. This commit fixes the following Khronos GLES3 CTS test: invalid_op_1_vertex invalid_op_1_fragment invalid_op_2_vertex invalid_op_2_fragment Reviewed-by: Jordan Justen <[email protected]>
* glsl/glcpp: Emit error for duplicate parameter name in function-like macroCarl Worth2014-07-293-0/+35
| | | | | | | | | | | | | | | | | This will emit an error for something like: #define FOO(x,x) ... Obviously, it's not a legal thing to do, and it's easy to check. Add a "make check" test for this as well. This fixes the following Khronos GLES3 CTS tests: invalid_function_definitions.unique_param_name_vertex invalid_function_definitions.unique_param_name_fragment Reviewed-by: Jordan Justen <[email protected]>
* glsl/glcpp: Add an explanatory comment for "loc != NULL" checkCarl Worth2014-07-291-0/+4
| | | | | | | | | | | Just reading the code, it looked like a bug that _define_object_macro had this check, but _define_function_macro did not. Upon further reading, that's because the check is to allow for our builtins to be defined, (and there are no builtin function-like macros). Add my new understanding as a comment to help the next reader. Reviewed-by: Jordan Justen <[email protected]>
* glsl/glcpp: Drop the HASH_ prefix from token names like HASH_IFCarl Worth2014-07-292-38/+39
| | | | | | | | | | | | | | | | | | | Previously, we had a single token for "#if" but now that we have two separate tokens, it looks much better to see: HASH_TOKEN IF than: HASH_TOKEN HASH_IF (Note, that for the same reason we use HASH_TOKEN instead of HASH, we also use DEFINE_TOKEN instead of DEFINE to avoid a conflict with the <DEFINE> start condition in the lexer.) There should be no behavioral change from this commit. Reviewed-by: Jordan Justen <[email protected]>
* glsl/glcpp: Correctly parse directives with intervening commentsCarl Worth2014-07-2916-110/+242
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | It's legal (though highly bizarre) for a pre-processor directive to look like this: # /* why? */ define FOO bar This behavior comes about since the specification defines separate logical phases in a precise order, and comment-removal occurs in a phase before the identification of directives. Our implementation does not use an actual separate phase for comment removal, so some extra care is necessary to correctly parse this. What we want is for '#' to introduce a directive iff it is the first token on a line, (ignoring whitespace and comments). Previously, we had a lexical rule that worked only for whitespace (not comments) with the following regular expression to find a directive-introducing '#' at the beginning of a line: HASH ^{HSPACE}*#{HSPACE}* In this commit, we switch to instead use a simple literal match of '#' to return a HASH_TOKEN token and add a new <HASH> start condition for whenever the HASH_TOKEN is the first non-space token of a line. This requires the addition of the new bit of state: first_non_space_token_this_line. This approach has a couple of implications on the glcpp parser: 1. The parser now sees two separate tokens, (such as HASH_TOKEN and HASH_DEFINE) where it previously saw one token (HASH_DEFINE) for the sequence "#define". This is a straightforward change throughout the grammar. 2. The parser may now see a SPACE token before the HASH_TOKEN token of a directive. Previously the lexical regular expression for {HASH} would eat up the space and there would be no SPACE token. This second implication is a bit of a nuisance for the parser. It causes a SPACE token to appear in a production of the grammar with the following two definitions of a control_line: control_line SPACE control_line This is really ugly, since normally a space would simply be a token separator, so it wouldn't appear in the tokens of a production. This leads to a further problem with interleaved spaces and comments: /* ... */ /* ... */ #define /* ..*/ For this, we must not return several consecutive SPACE tokens, or else we would need an arbitrary number of new productions: SPACE SPACE control_line SPACE SPACE SPACE control_line ad nauseam To avoid this problem, in this commit we also change the lexer to emit only a single SPACE token for any series of consecutive spaces, (whether from actual whitespace or comments). For this compression, we add a new bit of parser state: last_token_was_space. And we also update the expected results of all necessary test cases for the new compression of space tokens. Fortunately, the compression of spaces should not lead to any semantic changes in terms of what the eventual GLSL compiler sees. So there's a lot happening in this commit, (particularly for such a tiny feature). But fortunately, the lexer itself is looking cleaner than ever. The only ugly bit is all the state updating, but it is at least isolated to a single shared function. Of course, a new "make check" test is added for the new feature, (directives with comments and whitespace interleaved in many combinations). And this commit fixes the following Khronos GLES3 CTS tests: function_definition_with_comments_vertex function_definition_with_comments_fragment Reviewed-by: Jordan Justen <[email protected]>
* glsl/glcpp: Rename HASH token to HASH_TOKENCarl Worth2014-07-292-5/+8
| | | | | | | | | | | This is in preparation for the planned addition of a new <HASH> start condition to the lexer. Both start conditions and token types are, of course, in the same default C namespace, so a start condition and a token type with the same name will collide. (And unfortunately, they are both apparently implemented as equivalent numeric types so the collision is undetected at compile time and simply leads to unpredictable behavior at run time.) Reviewed-by: Jordan Justen <[email protected]>
* glsl/glcpp: Don't use start-condition stack when switching to/from <DEFINE>Carl Worth2014-07-291-3/+3
| | | | | | | | | | | | | | | | | | | | | This commit does not cause any behavioral change for any valid program. Prior to entering the <DEFINE> start condition, the only valid start condition is <INITIAL>, so whether pushing/popping <DEFINE> onto the stack or explicit returning to <INITIAL> is equivalent. The reason for this change is that we are planning to soon add a start condition for <HASH> with the following semantics: <HASH>: We just saw a directive-introducing '#' <DEFINE>: We just saw "#define" starting a directive With these two start conditions in place, the only correct behavior is to leave <DEFINE> by returning to <INITIAL>. But the old push/pop code would have returned to the <HASH> start condition which would then cause an error when the next directive-introducing '#' would be encountered. Reviewed-by: Jordan Justen <[email protected]>
* glsl/glcpp: Add a -d/--debug option to the standalone glcpp programCarl Worth2014-07-292-1/+7
| | | | | | | | | The verbose debug output from the parser is quite useful when debugging, and having this available as a command-line option is much more convenient than manually forcing this into the code when needed, (which is what I had been doing for too long previously). Reviewed-by: Jordan Justen <[email protected]>
* glsl/glcpp: Fix off-by-one error in column in first-line error messagesCarl Worth2014-07-2917-19/+19
| | | | | | | | | | | | | | For the first line we were initializing the column to 1, but for all subsequent lines we were initializing the column to 0. The column number is advanced for each token read before any error message is printed. So the 0 value is the correct initialization, (so that the first column is reported as column 1). With this extremely minor change, many of the .expected files are updated such that error messages for the first line now have the correct column number in them. Reviewed-by: Jordan Justen <[email protected]>
* glsl/glcpp: Minor tweak to wording of error messageCarl Worth2014-07-293-3/+3
| | | | | | It makes more sense to print the directive name with the preceding '#'. Reviewed-by: Jordan Justen <[email protected]>
* glsl/glcpp: Stop using a lexer start condition (<SKIP>) for token skipping.Carl Worth2014-07-293-63/+99
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Here, "skipping" refers to the lexer not emitting any tokens for portions of the file within an #if condition (or similar) that evaluates to false. Previously, the lexer had a special <SKIP> start condition used to control this skipping. This start condition was not handled like a normal start condition. Instead, there was a particularly ugly block of code set to be included at the top of the generated lexing loop that would change from <INITIAL> to <SKIP> or from <SKIP> to <INITIAL> depending on various pieces of parser state, (such as parser->skip_state and parser->lexing_directive). Not only was that an ugly approach, but the <SKIP> start condition was complicating several glcpp bug fixes I attempted recently that want to use start conditions for other purposes, (such as a new <HASH> start condition). The recently added RETURN_TOKEN macro gives us a convenient way to implement skipping without using a lexer start condition. Now, at the top of the generated lexer, we examine all the necessary parser state and set a new parser->skipping bit. Then, in RETURN_TOKEN, we examine parser->skipping to determine whether to actually emit the token or not. Besides this, there are only a couple of other places where we need to examine the skipping bit (other than when returning a token): * To avoid emitting an error for #error if skipped. * To avoid entering the <DEFINE> start condition for a #define that is skipped. With all of this in place in the present commit, there are hopefully no behavioral changes with this patch, ("make check" still passes all of the glcpp tests at least). Reviewed-by: Jordan Justen <[email protected]>
* glsl/glcpp: Abstract a bit of common code for returning string tokensCarl Worth2014-07-291-22/+18
| | | | | | | Now that we have a common macro for returning tokens, it makes sense to perform some of the common work there, (such as copying string values). Reviewed-by: Jordan Justen <[email protected]>
* glsl/glcpp: Drop extra, final newline from most outputCarl Worth2014-07-29130-165/+51
| | | | | | | | | | | | | | | | | | | | The glcpp parser is line-based, so it needs to see a NEWLINE token at the end of each line. This causes a trick for files that end without a final newline. Previously, the lexer for glcpp punted in this case by unconditionally returning a NEWLINE token at end-of-file, (causing most files to have an extra blank line at the end). Here, we refine this by lexing end-of-file as a NEWLINE token only if the immediately preceding token was not a NEWLINE token. The patch is a minor change that only looks huge for two reasons: 1. Almost all glcpp test result ".expected" files are updated to drop the extra newline. 2. All return statements from the lexer are adjusted to use a new RETURN_TOKEN macro that tracks the last-token-was-a-newline state. Reviewed-by: Jordan Justen <[email protected]>
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 22:15:46 +0000