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Add support for hexadecimal FP constants!
llvm-svn: 2135
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@ -19,9 +19,6 @@
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%{
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#include "ParserInternals.h"
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#include "llvm/BasicBlock.h"
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#include "llvm/Method.h"
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#include "llvm/Module.h"
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#include <list>
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#include "llvmAsmParser.h"
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#include <ctype.h>
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@ -39,19 +36,45 @@
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// long representation... this does not have to do input error checking,
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// because we know that the input will be matched by a suitable regex...
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//
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uint64_t atoull(const char *Buffer) {
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static uint64_t atoull(const char *Buffer) {
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uint64_t Result = 0;
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for (; *Buffer; Buffer++) {
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uint64_t OldRes = Result;
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Result *= 10;
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Result += *Buffer-'0';
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if (Result < OldRes) { // Uh, oh, overflow detected!!!
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if (Result < OldRes) // Uh, oh, overflow detected!!!
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ThrowException("constant bigger than 64 bits detected!");
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}
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}
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return Result;
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}
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// HexToFP - Convert the ascii string in hexidecimal format to the floating
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// point representation of it.
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//
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static double HexToFP(const char *Buffer) {
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uint64_t Result = 0;
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for (; *Buffer; ++Buffer) {
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uint64_t OldRes = Result;
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Result *= 16;
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char C = *Buffer;
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if (C >= '0' && C <= '9')
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Result += C-'0';
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else if (C >= 'A' && C <= 'F')
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Result += C-'A'+10;
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else if (C >= 'a' && C <= 'f')
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Result += C-'a'+10;
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if (Result < OldRes) // Uh, oh, overflow detected!!!
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ThrowException("constant bigger than 64 bits detected!");
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}
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assert(sizeof(double) == sizeof(Result) &&
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"Data sizes incompatible on this target!");
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void *ProxyPointer = &Result; // Break TBAA correctly
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cerr << "VALUE: " << *(double*)ProxyPointer << "\n";
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return *(double*)ProxyPointer; // Cast Hex constant to double
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}
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// UnEscapeLexed - Run through the specified buffer and change \xx codes to the
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// appropriate character. If AllowNull is set to false, a \00 value will cause
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@ -110,9 +133,13 @@ PInteger [0-9]+
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NInteger -[0-9]+
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/* FPConstant - A Floating point constant.
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TODO: Expand lexer to support 10e50 FP constant notation */
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*/
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FPConstant [-+]?[0-9]+[.][0-9]*([eE][-+]?[0-9]+)?
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/* HexFPConstant - Floating point constant represented in IEEE format as a
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* hexadecimal number for when exponential notation is not precise enough.
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*/
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HexFPConstant 0x[0-9A-Fa-f]+
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%%
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{Comment} { /* Ignore comments for now */ }
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@ -233,6 +260,7 @@ getelementptr { RET_TOK(MemOpVal, GetElementPtr, GETELEMENTPTR); }
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}
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{FPConstant} { llvmAsmlval.FPVal = atof(yytext); return FPVAL; }
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{HexFPConstant} { llvmAsmlval.FPVal = HexToFP(yytext); return FPVAL; }
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[ \t\n] { /* Ignore whitespace */ }
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. { return yytext[0]; }
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