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271 lines
9.1 KiB
C++
271 lines
9.1 KiB
C++
/*===-- Lexer.l - Scanner for llvm assembly files ----------------*- C++ -*--=//
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//
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// This file implements the flex scanner for LLVM assembly languages files.
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//
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//===------------------------------------------------------------------------=*/
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%option prefix="llvmAsm"
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%option yylineno
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%option nostdinit
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%option never-interactive
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%option batch
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%option noyywrap
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%option nodefault
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%option 8bit
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%option outfile="Lexer.cpp"
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%option ecs
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%option noreject
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%option noyymore
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%{
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#include "ParserInternals.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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#include <stdlib.h>
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#define RET_TOK(type, Enum, sym) \
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llvmAsmlval.type = Instruction::Enum; return sym
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// TODO: All of the static identifiers are figured out by the lexer,
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// these should be hashed to reduce the lexer size
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// atoull - Convert an ascii string of decimal digits into the unsigned long
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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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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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ThrowException("constant bigger than 64 bits detected!");
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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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// Behave nicely in the face of C TBAA rules... see:
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// http://www.nullstone.com/htmls/category/aliastyp.htm
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//
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char *ProxyPointer = (char*)&Result;
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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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// an exception to be thrown.
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//
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// If AllowNull is set to true, the return value of the function points to the
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// last character of the string in memory.
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//
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char *UnEscapeLexed(char *Buffer, bool AllowNull = false) {
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char *BOut = Buffer;
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for (char *BIn = Buffer; *BIn; ) {
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if (BIn[0] == '\\' && isxdigit(BIn[1]) && isxdigit(BIn[2])) {
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char Tmp = BIn[3]; BIn[3] = 0; // Terminate string
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*BOut = strtol(BIn+1, 0, 16); // Convert to number
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if (!AllowNull && !*BOut)
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ThrowException("String literal cannot accept \\00 escape!");
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BIn[3] = Tmp; // Restore character
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BIn += 3; // Skip over handled chars
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++BOut;
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} else {
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*BOut++ = *BIn++;
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}
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}
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return BOut;
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}
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#define YY_NEVER_INTERACTIVE 1
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%}
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/* Comments start with a ; and go till end of line */
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Comment ;.*
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/* Variable(Value) identifiers start with a % sign */
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VarID %[-a-zA-Z$._][-a-zA-Z$._0-9]*
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/* Label identifiers end with a colon */
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Label [-a-zA-Z$._0-9]+:
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/* Quoted names can contain any character except " and \ */
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StringConstant \"[^\"]+\"
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/* [PN]Integer: match positive and negative literal integer values that
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* are preceeded by a '%' character. These represent unnamed variable slots.
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*/
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EPInteger %[0-9]+
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ENInteger %-[0-9]+
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/* E[PN]Integer: match positive and negative literal integer values */
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PInteger [0-9]+
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NInteger -[0-9]+
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/* FPConstant - A Floating point constant.
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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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begin { return BEGINTOK; }
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end { return END; }
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true { return TRUE; }
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false { return FALSE; }
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declare { return DECLARE; }
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global { return GLOBAL; }
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constant { return CONSTANT; }
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const { return CONST; }
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internal { return INTERNAL; }
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uninitialized { return UNINIT; }
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implementation { return IMPLEMENTATION; }
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\.\.\. { return DOTDOTDOT; }
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string { return STRING; }
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null { return NULL_TOK; }
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to { return TO; }
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except { return EXCEPT; }
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void { llvmAsmlval.PrimType = Type::VoidTy ; return VOID; }
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bool { llvmAsmlval.PrimType = Type::BoolTy ; return BOOL; }
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sbyte { llvmAsmlval.PrimType = Type::SByteTy ; return SBYTE; }
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ubyte { llvmAsmlval.PrimType = Type::UByteTy ; return UBYTE; }
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short { llvmAsmlval.PrimType = Type::ShortTy ; return SHORT; }
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ushort { llvmAsmlval.PrimType = Type::UShortTy; return USHORT; }
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int { llvmAsmlval.PrimType = Type::IntTy ; return INT; }
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uint { llvmAsmlval.PrimType = Type::UIntTy ; return UINT; }
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long { llvmAsmlval.PrimType = Type::LongTy ; return LONG; }
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ulong { llvmAsmlval.PrimType = Type::ULongTy ; return ULONG; }
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float { llvmAsmlval.PrimType = Type::FloatTy ; return FLOAT; }
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double { llvmAsmlval.PrimType = Type::DoubleTy; return DOUBLE; }
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type { llvmAsmlval.PrimType = Type::TypeTy ; return TYPE; }
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label { llvmAsmlval.PrimType = Type::LabelTy ; return LABEL; }
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opaque { return OPAQUE; }
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not { RET_TOK(UnaryOpVal, Not, NOT); }
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add { RET_TOK(BinaryOpVal, Add, ADD); }
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sub { RET_TOK(BinaryOpVal, Sub, SUB); }
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mul { RET_TOK(BinaryOpVal, Mul, MUL); }
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div { RET_TOK(BinaryOpVal, Div, DIV); }
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rem { RET_TOK(BinaryOpVal, Rem, REM); }
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and { RET_TOK(BinaryOpVal, And, AND); }
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or { RET_TOK(BinaryOpVal, Or , OR ); }
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xor { RET_TOK(BinaryOpVal, Xor, XOR); }
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setne { RET_TOK(BinaryOpVal, SetNE, SETNE); }
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seteq { RET_TOK(BinaryOpVal, SetEQ, SETEQ); }
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setlt { RET_TOK(BinaryOpVal, SetLT, SETLT); }
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setgt { RET_TOK(BinaryOpVal, SetGT, SETGT); }
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setle { RET_TOK(BinaryOpVal, SetLE, SETLE); }
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setge { RET_TOK(BinaryOpVal, SetGE, SETGE); }
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phi { RET_TOK(OtherOpVal, PHINode, PHI); }
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call { RET_TOK(OtherOpVal, Call, CALL); }
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cast { RET_TOK(OtherOpVal, Cast, CAST); }
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shl { RET_TOK(OtherOpVal, Shl, SHL); }
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shr { RET_TOK(OtherOpVal, Shr, SHR); }
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ret { RET_TOK(TermOpVal, Ret, RET); }
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br { RET_TOK(TermOpVal, Br, BR); }
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switch { RET_TOK(TermOpVal, Switch, SWITCH); }
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invoke { RET_TOK(TermOpVal, Invoke, INVOKE); }
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malloc { RET_TOK(MemOpVal, Malloc, MALLOC); }
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alloca { RET_TOK(MemOpVal, Alloca, ALLOCA); }
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free { RET_TOK(MemOpVal, Free, FREE); }
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load { RET_TOK(MemOpVal, Load, LOAD); }
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store { RET_TOK(MemOpVal, Store, STORE); }
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getelementptr { RET_TOK(MemOpVal, GetElementPtr, GETELEMENTPTR); }
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{VarID} {
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UnEscapeLexed(yytext+1);
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llvmAsmlval.StrVal = strdup(yytext+1); // Skip %
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return VAR_ID;
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}
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{Label} {
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yytext[strlen(yytext)-1] = 0; // nuke colon
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UnEscapeLexed(yytext);
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llvmAsmlval.StrVal = strdup(yytext);
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return LABELSTR;
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}
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{StringConstant} { // Note that we cannot unescape a string constant here! The
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// string constant might contain a \00 which would not be
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// understood by the string stuff. It is valid to make a
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// [sbyte] c"Hello World\00" constant, for example.
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//
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yytext[strlen(yytext)-1] = 0; // nuke end quote
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llvmAsmlval.StrVal = strdup(yytext+1); // Nuke start quote
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return STRINGCONSTANT;
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}
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{PInteger} { llvmAsmlval.UInt64Val = atoull(yytext); return EUINT64VAL; }
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{NInteger} {
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uint64_t Val = atoull(yytext+1);
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// +1: we have bigger negative range
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if (Val > (uint64_t)INT64_MAX+1)
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ThrowException("Constant too large for signed 64 bits!");
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llvmAsmlval.SInt64Val = -Val;
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return ESINT64VAL;
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}
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{EPInteger} { llvmAsmlval.UIntVal = atoull(yytext+1); return UINTVAL; }
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{ENInteger} {
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uint64_t Val = atoull(yytext+2);
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// +1: we have bigger negative range
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if (Val > (uint64_t)INT32_MAX+1)
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ThrowException("Constant too large for signed 32 bits!");
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llvmAsmlval.SIntVal = -Val;
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return SINTVAL;
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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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%%
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