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Add a comment about the mechanisms used to rid AsmParser of exceptions.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29769 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2006-08-18 17:32:55 +00:00
parent bd4b758d2d
commit e4f4759857
4 changed files with 244 additions and 214 deletions
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432
lib/AsmParser/llvmAsmParser.cpp.cvs
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2
lib/AsmParser/llvmAsmParser.h.cvs
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@ -237,7 +237,7 @@
#if ! defined (YYSTYPE) && ! defined (YYSTYPE_IS_DECLARED)
#line 897 "/proj/llvm/llvm/lib/AsmParser/llvmAsmParser.y"
#line 907 "/proj/llvm/llvm/lib/AsmParser/llvmAsmParser.y"
typedef union YYSTYPE {
llvm::Module *ModuleVal;
llvm::Function *FunctionVal;

12
lib/AsmParser/llvmAsmParser.y
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@ -27,9 +27,19 @@
#include <list>
#include <utility>
// The following is a gross hack. In order to rid the libAsmParser library of
// exceptions, we have to have a way of getting the yyparse function to go into
// an error situation. So, whenever we want an error to occur, the GenerateError
// function (see bottom of file) sets TriggerError. Then, at the end of each
// production in the grammer we use CHECK_FOR_ERROR which will invoke YYERROR
// (a goto) to put YACC in error state. Furthermore, several calls to
// GenerateError are made from inside productions and they must simulate the
// previous exception behavior by exiting the production immediately. We have
// replaced these with the GEN_ERROR macro which calls GeneratError and then
// immediately invokes YYERROR. This would be so much cleaner if it was a
// recursive descent parser.
static bool TriggerError = false;
#define CHECK_FOR_ERROR { if (TriggerError) { TriggerError = false; YYERROR; } }
#define GEN_ERROR(msg) { GenerateError(msg); YYERROR; }
int yyerror(const char *ErrorMsg); // Forward declarations to prevent "implicit

12
lib/AsmParser/llvmAsmParser.y.cvs
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@ -27,9 +27,19 @@
#include <list>
#include <utility>
// The following is a gross hack. In order to rid the libAsmParser library of
// exceptions, we have to have a way of getting the yyparse function to go into
// an error situation. So, whenever we want an error to occur, the GenerateError
// function (see bottom of file) sets TriggerError. Then, at the end of each
// production in the grammer we use CHECK_FOR_ERROR which will invoke YYERROR
// (a goto) to put YACC in error state. Furthermore, several calls to
// GenerateError are made from inside productions and they must simulate the
// previous exception behavior by exiting the production immediately. We have
// replaced these with the GEN_ERROR macro which calls GeneratError and then
// immediately invokes YYERROR. This would be so much cleaner if it was a
// recursive descent parser.
static bool TriggerError = false;
#define CHECK_FOR_ERROR { if (TriggerError) { TriggerError = false; YYERROR; } }
#define GEN_ERROR(msg) { GenerateError(msg); YYERROR; }
int yyerror(const char *ErrorMsg); // Forward declarations to prevent "implicit