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/* |
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* Copyright (c) 2014-2020 Christian Schoenebeck |
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* |
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* http://www.linuxsampler.org |
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* |
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* This file is part of LinuxSampler and released under the same terms. |
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* See README file for details. |
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*/ |
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|
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// types shared between auto generated lexer and parser ... |
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|
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#ifndef LS_INSTRSCRIPTSPARSER_SHARED_H |
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#define LS_INSTRSCRIPTSPARSER_SHARED_H |
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|
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#include <stdio.h> |
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#include "tree.h" |
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|
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#if AC_APPLE_UNIVERSAL_BUILD |
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# include "parser.tab.h" |
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#else |
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# include "parser.h" |
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#endif |
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|
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#include "../common/global_private.h" |
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|
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struct _YYSTYPE { |
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union { |
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LinuxSampler::vmint iValue; |
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LinuxSampler::vmfloat fValue; |
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// Intentionally using C-strings instead of std::string for parser's |
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// string tokens, because any destructor based class had a negative |
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// impact on parser performance in benchmarks. Reason for this is that |
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// text tokens are the most common one while parsing, plus the parser |
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// copies the YYSTYPE struct a lot (i.e. when shifting). For C-strings |
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// coming directly from Flex, we don't have to free them. For C-strings |
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// allocated by us, use yyextra->autoFreeAfterParse(s); |
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char* sValue; |
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struct { |
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LinuxSampler::vmint iValue; |
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LinuxSampler::MetricPrefix_t prefix[2]; |
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LinuxSampler::StdUnit_t unit; |
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} iUnitValue; |
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struct { |
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LinuxSampler::vmfloat fValue; |
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LinuxSampler::MetricPrefix_t prefix[2]; |
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LinuxSampler::StdUnit_t unit; |
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} fUnitValue; |
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}; |
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LinuxSampler::EventHandlersRef nEventHandlers; |
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LinuxSampler::EventHandlerRef nEventHandler; |
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LinuxSampler::StatementsRef nStatements; |
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LinuxSampler::StatementRef nStatement; |
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LinuxSampler::FunctionCallRef nFunctionCall; |
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LinuxSampler::ArgsRef nArgs; |
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LinuxSampler::ExpressionRef nExpression; |
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LinuxSampler::CaseBranch nCaseBranch; |
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LinuxSampler::CaseBranches nCaseBranches; |
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LinuxSampler::Qualifier_t varQualifier; |
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}; |
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#define YYSTYPE _YYSTYPE |
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#define yystype YYSTYPE ///< For backward compatibility. |
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#ifndef YYSTYPE_IS_DECLARED |
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# define YYSTYPE_IS_DECLARED ///< We tell the lexer / parser that we use our own data structure as defined above. |
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#endif |
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|
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// custom Bison location type to support raw byte positions |
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struct _YYLTYPE { |
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int first_line; |
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int first_column; |
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int last_line; |
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int last_column; |
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int first_byte; |
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int length_bytes; |
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}; |
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#define YYLTYPE _YYLTYPE |
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#define YYLTYPE_IS_DECLARED 1 |
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|
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// override Bison's default location passing to support raw byte positions |
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#define YYLLOC_DEFAULT(Cur, Rhs, N) \ |
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do \ |
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if (N) \ |
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{ \ |
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(Cur).first_line = YYRHSLOC(Rhs, 1).first_line; \ |
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(Cur).first_column = YYRHSLOC(Rhs, 1).first_column; \ |
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(Cur).last_line = YYRHSLOC(Rhs, N).last_line; \ |
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(Cur).last_column = YYRHSLOC(Rhs, N).last_column; \ |
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(Cur).first_byte = YYRHSLOC(Rhs, 1).first_byte; \ |
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(Cur).length_bytes = (YYRHSLOC(Rhs, N).first_byte - \ |
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YYRHSLOC(Rhs, 1).first_byte) + \ |
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YYRHSLOC(Rhs, N).length_bytes; \ |
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} \ |
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else \ |
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{ \ |
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(Cur).first_line = (Cur).last_line = \ |
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YYRHSLOC(Rhs, 0).last_line; \ |
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(Cur).first_column = (Cur).last_column = \ |
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YYRHSLOC(Rhs, 0).last_column; \ |
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(Cur).first_byte = YYRHSLOC(Rhs, 0).first_byte; \ |
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(Cur).length_bytes = YYRHSLOC(Rhs, 0).length_bytes; \ |
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} \ |
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while (0) |
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|
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// Force YYCOPY() to use copy by value. |
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// |
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// By default YYCOPY() is using __builtin_memcpy, which is slightly problematic |
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// with our YYSTYPE (see above) since it has dynamic objects as member variables |
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// and hence __builtin_memcpy would overwrite their vpointer. In practice though |
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// this is more of a theoretical fix and probably just silences compiler |
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// warnings. So in practice __builtin_memcpy would probably not cause any |
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// misbehaviours, because it is expected that Bison generated parsers only use |
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// YYCOPY() to relocate the parser's stack (that is moving objects in memory), |
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// but not for really creating duplicates of any objects. |
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// |
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// In my benchmarks I did not encounter any measurable performance difference by |
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// this change, so shutting up the compiler wins for now. |
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#define YYCOPY(To, From, Count) \ |
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do { \ |
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for (YYSIZE_T i = 0; i < (Count); ++i) \ |
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(To)[i] = (From)[i]; \ |
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} while (YYID (0)); \ |
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|
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#endif // LS_INSTRSCRIPTSPARSER_SHARED_H |