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Added support for floating point constants in the scanner and Primary()

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git-svn-id: svn://svn.cc65.org/cc65/trunk@3108 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz 2004-06-06 15:59:44 +00:00
parent 9fc71c5e93
commit f500a641c5
3 changed files with 281 additions and 120 deletions
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20
src/cc65/expr.c
View File

@ -766,21 +766,31 @@ static void Primary (ExprDesc* E)
/* Character and integer constants. */
if (CurTok.Tok == TOK_ICONST || CurTok.Tok == TOK_CCONST) {
E->IVal = CurTok.IVal;
E->Flags = E_LOC_ABS | E_RTYPE_RVAL;
E->Type = CurTok.Type;
E->IVal = CurTok.IVal;
NextToken ();
return;
}
/* Floating point constant */
if (CurTok.Tok == TOK_FCONST) {
E->FVal = CurTok.FVal;
E->Flags = E_LOC_ABS | E_RTYPE_RVAL;
E->Type = CurTok.Type;
printf ("Floating point constant: %f\n", E->FVal);
NextToken ();
return;
}
/* Process parenthesized subexpression by calling the whole parser
* recursively.
*/
if (CurTok.Tok == TOK_LPAREN) {
NextToken ();
NextToken ();
hie0 (E);
ConsumeRParen ();
return;
return;
}
/* If we run into an identifier in preprocessing mode, we assume that this
@ -1475,7 +1485,7 @@ static void PreInc (ExprDesc* Expr)
ED_MakeRValExpr (Expr);
}
static void PreDec (ExprDesc* Expr)
/* Handle the predecrement operators */
@ -1547,7 +1557,7 @@ static void PreDec (ExprDesc* Expr)
}
static void PostIncDec (ExprDesc* Expr, void (*inc) (unsigned, unsigned long))
/* Handle i-- and i++ */
{

2
src/cc65/make/gcc.mak
View File

@ -20,7 +20,7 @@ COMMON = ../common
CFLAGS = -O2 -g -Wall -W -I$(COMMON) $(CDEFS)
CC=gcc
EBIND=emxbind
LDFLAGS=
LDFLAGS=-lm
# ------------------------------------------------------------------------------
# Object files and libraries to link

379
src/cc65/scanner.c
View File

@ -38,6 +38,7 @@
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <math.h>
/* common */
#include "chartype.h"
@ -391,7 +392,7 @@ static void StringConst (void)
}
/* Skip closing quote char if there was one */
NextChar ();
NextChar ();
/* Skip white space, read new input */
SkipWhite ();
@ -404,6 +405,252 @@ static void StringConst (void)
static void NumericConst (void)
/* Parse a numeric constant */
{
unsigned Base; /* Temporary number base */
unsigned Prefix; /* Base according to prefix */
StrBuf S;
int IsFloat;
char C;
unsigned DigitVal;
unsigned long IVal; /* Value */
/* Check for a leading hex or octal prefix and determine the possible
* integer types.
*/
if (CurC == '0') {
/* Gobble 0 and examine next char */
NextChar ();
if (toupper (CurC) == 'X') {
Base = Prefix = 16;
NextChar (); /* gobble "x" */
} else {
Base = 10; /* Assume 10 for now - see below */
Prefix = 8; /* Actual prefix says octal */
}
} else {
Base = Prefix = 10;
}
/* Because floating point numbers don't have octal prefixes (a number
* with a leading zero is decimal), we first have to read the number
* before converting it, so we can determine if it's a float or an
* integer.
*/
InitStrBuf (&S);
while (IsXDigit (CurC) && HexVal (CurC) < Base) {
SB_AppendChar (&S, CurC);
NextChar ();
}
SB_Terminate (&S);
/* The following character tells us if we have an integer or floating
* point constant.
*/
IsFloat = (CurC == '.' ||
(Base == 10 && toupper (CurC) == 'E') ||
(Base == 16 && toupper (CurC) == 'P'));
/* If we don't have a floating point type, an octal prefix results in an
* octal base.
*/
if (!IsFloat && Prefix == 8) {
Base = 8;
}
/* Since we do now know the correct base, convert the remembered input
* into a number.
*/
SB_Reset (&S);
IVal = 0;
while ((C = SB_Get (&S)) != '\0') {
DigitVal = HexVal (C);
if (DigitVal >= Base) {
Error ("Numeric constant contains digits beyond the radix");
}
IVal = (IVal * Base) + DigitVal;
}
/* We don't need the string buffer any longer */
DoneStrBuf (&S);
/* Distinguish between integer and floating point constants */
if (!IsFloat) {
unsigned Types;
int HaveSuffix;
/* Check for a suffix and determine the possible types */
HaveSuffix = 1;
if (toupper (CurC) == 'U') {
/* Unsigned type */
NextChar ();
if (toupper (CurC) != 'L') {
Types = IT_UINT | IT_ULONG;
} else {
NextChar ();
Types = IT_ULONG;
}
} else if (toupper (CurC) == 'L') {
/* Long type */
NextChar ();
if (toupper (CurC) != 'U') {
Types = IT_LONG | IT_ULONG;
} else {
NextChar ();
Types = IT_ULONG;
}
} else {
HaveSuffix = 0;
if (Prefix == 10) {
/* Decimal constants are of any type but uint */
Types = IT_INT | IT_LONG | IT_ULONG;
} else {
/* Octal or hex constants are of any type */
Types = IT_INT | IT_UINT | IT_LONG | IT_ULONG;
}
}
/* Check the range to determine the type */
if (IVal > 0x7FFF) {
/* Out of range for int */
Types &= ~IT_INT;
/* If the value is in the range 0x8000..0xFFFF, unsigned int is not
* allowed, and we don't have a type specifying suffix, emit a
* warning, because the constant is of type long.
*/
if (IVal <= 0xFFFF && (Types & IT_UINT) == 0 && !HaveSuffix) {
Warning ("Constant is long");
}
}
if (IVal > 0xFFFF) {
/* Out of range for unsigned int */
Types &= ~IT_UINT;
}
if (IVal > 0x7FFFFFFF) {
/* Out of range for long int */
Types &= ~IT_LONG;
}
/* Now set the type string to the smallest type in types */
if (Types & IT_INT) {
NextTok.Type = type_int;
} else if (Types & IT_UINT) {
NextTok.Type = type_uint;
} else if (Types & IT_LONG) {
NextTok.Type = type_long;
} else {
NextTok.Type = type_ulong;
}
/* Set the value and the token */
NextTok.IVal = IVal;
NextTok.Tok = TOK_ICONST;
} else {
/* Float constant */
double FVal = IVal; /* Convert to float */
/* Check for a fractional part and read it */
if (CurC == '.') {
unsigned Digits;
unsigned long Frac;
unsigned long Scale;
/* Skip the dot */
NextChar ();
/* Read fractional digits. Since we support only 32 bit floats
* with a maximum of 7 fractional digits, we read the fractional
* part as integer with up to 8 digits and drop the remainder.
* This avoids an overflow of Frac and Scale.
*/
Digits = 0;
Frac = 0;
Scale = 1;
while (IsXDigit (CurC) && (DigitVal = HexVal (CurC)) < Base) {
if (Digits < 8) {
Frac = Frac * Base + DigitVal;
++Digits;
Scale *= Base;
}
NextChar ();
}
/* Scale the fractional part and add it */
if (Frac) {
FVal += ((double) Frac) / ((double) Scale);
}
}
/* Check for an exponent and read it */
if ((Base == 16 && toupper (CurC) == 'F') ||
(Base == 10 && toupper (CurC) == 'E')) {
int Sign;
unsigned Digits;
unsigned Exp;
/* Skip the exponent notifier */
NextChar ();
/* Read an optional sign */
Sign = 1;
if (CurC == '-') {
Sign = -1;
NextChar ();
}
/* Read exponent digits. Since we support only 32 bit floats
* with a maximum exponent of +-/127, we read the exponent
* part as integer with up to 3 digits and drop the remainder.
* This avoids an overflow of Exp. The exponent is always
* decimal, even for hex float consts.
*/
Digits = 0;
Exp = 0;
while (IsDigit (CurC)) {
if (++Digits <= 3) {
Exp = Exp * 10 + HexVal (CurC);
}
NextChar ();
}
/* Check for errors: We must have exponent digits, and not more
* than three.
*/
if (Digits == 0) {
Error ("Floating constant exponent has no digits");
} else if (Digits > 3) {
Warning ("Floating constant exponent is too large");
}
/* Scale the exponent and adjust the value accordingly */
if (Exp) {
FVal *= pow (10, Exp);
}
}
/* Check for a suffix and determine the type of the constant */
if (toupper (CurC) == 'F') {
NextChar ();
NextTok.Type = type_float;
} else {
NextTok.Type = type_double;
}
/* Set the value and the token */
NextTok.FVal = FVal;
NextTok.Tok = TOK_FCONST;
}
}
void NextToken (void)
/* Get next token from input stream */
{
@ -442,108 +689,8 @@ void NextToken (void)
/* Determine the next token from the lookahead */
if (IsDigit (CurC)) {
/* A number */
int HaveSuffix; /* True if we have a type suffix */
unsigned types; /* Possible types */
unsigned Base;
unsigned DigitVal;
unsigned long k; /* Value */
k = 0;
Base = 10;
types = IT_INT | IT_LONG | IT_ULONG;
if (CurC == '0') {
/* Octal or hex constants may also be of type unsigned int */
types = IT_INT | IT_UINT | IT_LONG | IT_ULONG;
/* gobble 0 and examin next char */
NextChar ();
if (toupper (CurC) == 'X') {
Base = 16;
NextTok.Type = type_uint;
NextChar (); /* gobble "x" */
} else {
Base = 8;
}
}
while (IsXDigit (CurC) && (DigitVal = HexVal (CurC)) < Base) {
k = k * Base + DigitVal;
NextChar ();
}
/* Check for errorneous digits */
if (Base == 8 && IsDigit (CurC)) {
Error ("Numeric constant contains digits beyond the radix");
/* Do error recovery */
do {
NextChar ();
} while (IsDigit (CurC));
} else if (Base != 16 && IsXDigit (CurC)) {
Error ("Nondigits in number and not hexadecimal");
do {
NextChar ();
} while (IsXDigit (CurC));
}
/* Check for a suffix */
HaveSuffix = 1;
if (CurC == 'u' || CurC == 'U') {
/* Unsigned type */
NextChar ();
if (toupper (CurC) != 'L') {
types = IT_UINT | IT_ULONG;
} else {
NextChar ();
types = IT_ULONG;
}
} else if (CurC == 'l' || CurC == 'L') {
/* Long type */
NextChar ();
if (toupper (CurC) != 'U') {
types = IT_LONG | IT_ULONG;
} else {
NextChar ();
types = IT_ULONG;
}
} else {
HaveSuffix = 0;
}
/* Check the range to determine the type */
if (k > 0x7FFF) {
/* Out of range for int */
types &= ~IT_INT;
/* If the value is in the range 0x8000..0xFFFF, unsigned int is not
* allowed, and we don't have a type specifying suffix, emit a
* warning.
*/
if (k <= 0xFFFF && (types & IT_UINT) == 0 && !HaveSuffix) {
Warning ("Constant is long");
}
}
if (k > 0xFFFF) {
/* Out of range for unsigned int */
types &= ~IT_UINT;
}
if (k > 0x7FFFFFFF) {
/* Out of range for long int */
types &= ~IT_LONG;
}
/* Now set the type string to the smallest type in types */
if (types & IT_INT) {
NextTok.Type = type_int;
} else if (types & IT_UINT) {
NextTok.Type = type_uint;
} else if (types & IT_LONG) {
NextTok.Type = type_long;
} else {
NextTok.Type = type_ulong;
}
/* Set the value and the token */
NextTok.IVal = k;
NextTok.Tok = TOK_ICONST;
NumericConst ();
return;
}
@ -677,18 +824,22 @@ void NextToken (void)
}
break;
case '.':
NextChar ();
if (CurC == '.') {
NextChar ();
if (CurC == '.') {
SetTok (TOK_ELLIPSIS);
} else {
UnknownChar (CurC);
}
} else {
NextTok.Tok = TOK_DOT;
}
case '.':
if (IsDigit (NextC)) {
NumericConst ();
} else {
NextChar ();
if (CurC == '.') {
NextChar ();
if (CurC == '.') {
SetTok (TOK_ELLIPSIS);
} else {
UnknownChar (CurC);
}
} else {
NextTok.Tok = TOK_DOT;
}
}
break;
case '/':