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expreval.c
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expreval.c
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/****************************************************************************
*
* Open Watcom Project
*
* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
* ========================================================================
*
* This file contains Original Code and/or Modifications of Original
* Code as defined in and that are subject to the Sybase Open Watcom
* Public License version 1.0 (the 'License'). You may not use this file
* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
* provided with the Original Code and Modifications, and is also
* available at www.sybase.com/developer/opensource.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
* NON-INFRINGEMENT. Please see the License for the specific language
* governing rights and limitations under the License.
*
* ========================================================================
*
* Description: expression evaluator.
*
****************************************************************************/
#include <stddef.h>
#include <ctype.h>
#include "globals.h"
#include "parser.h"
#include "reswords.h"
#include "expreval.h"
#include "segment.h"
#include "proc.h"
#include "assume.h"
#include "tokenize.h"
#include "types.h"
#include "label.h"
#include "atofloat.h"
#include "myassert.h"
#define ALIAS_IN_EXPR 1 /* allow alias names in expression */
#define UNARY_PLUSMINUS 0
#define BINARY_PLUSMINUS 1
/* activate if a detailed error location is needed and -dt cant be used */
#if 0
#define ERRLOC( i ) printf("Error at %s.%u: %u >%s< >%s<\n", __FILE__, __LINE__, i, ModuleInfo.tokenarray[i].string_ptr, ModuleInfo.tokenarray[0].tokpos )
//#undef DebugMsg1
//#define DebugMsg1( x ) printf x
#else
#define ERRLOC( i )
#endif
#if STACKBASESUPP==0
extern enum special_token basereg[];
#else
extern uint_32 StackAdj;
#endif
#ifdef DEBUG_OUT
static int evallvl = 0;
#endif
/* the following static variables should be moved to ModuleInfo. */
static struct asym *thissym; /* helper symbol for THIS operator */
static struct asym *nullstruct; /* used for T_DOT if second op is a forward ref */
static struct asym *nullmbr; /* used for T_DOT if "current" struct is a forward ref */
static int (* fnEmitErr)( int, ... );
static int noEmitErr( int msg, ... );
/* code label type values - returned by SIZE and TYPE operators */
enum labelsize {
LS_SHORT = 0xFF01, /* it's documented, but can a label be "short"? */
//LS_NEAR16 = 0xFF02, /* v2.09: the near values are calculated */
//LS_NEAR32 = 0xFF04,
//LS_NEAR64 = 0xFF08,
LS_FAR16 = 0xFF05,
LS_FAR32 = 0xFF06,
};
static void init_expr( struct expr *opnd )
/****************************************/
{
opnd->value = 0;
opnd->hvalue = 0;
opnd->hlvalue = 0;
opnd->quoted_string = NULL;
opnd->base_reg = NULL;
opnd->idx_reg = NULL;
opnd->label_tok = NULL;
opnd->override = NULL;
opnd->instr = EMPTY;
opnd->kind = EXPR_EMPTY;
opnd->mem_type = MT_EMPTY;
opnd->scale = 0;
opnd->Ofssize = USE_EMPTY;
opnd->flags1 = 0;
opnd->sym = NULL;
opnd->mbr = NULL;
opnd->type = NULL;
}
static void TokenAssign( struct expr *opnd1, const struct expr *opnd2 )
/*********************************************************************/
{
#if 1
/* note that offsetof() is used. This means, don't change position
of field <type> in expr! */
memcpy( opnd1, opnd2, offsetof( struct expr, type ) );
#else
opnd1->llvalue = opnd2->llvalue;
opnd1->hlvalue = opnd2->hlvalue;
opnd1->quoted_string = opnd2->quoted_string; /* probably useless */
opnd1->base_reg = opnd2->base_reg;
opnd1->idx_reg = opnd2->idx_reg;
opnd1->label_tok = opnd2->label_tok;
opnd1->override = opnd2->override;
opnd1->instr = opnd2->instr;
opnd1->kind = opnd2->kind;
opnd1->mem_type = opnd2->mem_type;
opnd1->scale = opnd2->scale;
opnd1->Ofssize = opnd2->Ofssize;
opnd1->flags1 = opnd2->flags1;
opnd1->sym = opnd2->sym;
opnd1->mbr = opnd2->mbr;
// opnd1->type = opnd2->type;
#endif
}
//#define BRACKET_PRECEDENCE 1
//#define PTR_PRECEDENCE 4
//#define PLUS_PRECEDENCE 9
#define CMP_PRECEDENCE 10
static int get_precedence( const struct asm_tok *item )
/*****************************************************/
{
/* The following table is taken verbatim from MASM 6.1 Programmer's Guide,
* page 14, Table 1.3.
* 1 (), []
* 2 LENGTH, SIZE, WIDTH, MASK, LENGTHOF, SIZEOF
* 3 . (structure-field-name operator)
* 4 : (segment override operator), PTR
* 5 LROFFSET, OFFSET, SEG, THIS, TYPE
* 6 HIGH, HIGHWORD, LOW, LOWWORD
* 7 +, - (unary)
* 8 *, /, MOD, SHL, SHR
* 9 +, - (binary)
* 10 EQ, NE, LT, LE, GT, GE
* 11 NOT
* 12 AND
* 13 OR, XOR
* 14 OPATTR, SHORT, .TYPE
* The following table appears in QuickHelp online documentation for
* both MASM 6.0 and 6.1. It's slightly different!
* 1 LENGTH, SIZE, WIDTH, MASK
* 2 (), []
* 3 . (structure-field-name operator)
* 4 : (segment override operator), PTR
* 5 THIS, OFFSET, SEG, TYPE
* 6 HIGH, LOW
* 7 +, - (unary)
* 8 *, /, MOD, SHL, SHR
* 9 +, - (binary)
* 10 EQ, NE, LT, LE, GT, GE
* 11 NOT
* 12 AND
* 13 OR, XOR
* 14 SHORT, OPATTR, .TYPE, ADDR
* japheth: the first table is the prefered one. Reasons:
* - () and [] must be first.
* - it contains operators SIZEOF, LENGTHOF, HIGHWORD, LOWWORD, LROFFSET
* - ADDR is no operator for expressions. It's exclusively used inside
* INVOKE directive.
* However, what's wrong in both tables is the precedence of
* the dot operator: Actually for both JWasm and Wasm the dot precedence
* is 2 and LENGTH, SIZE, ... have precedence 3 instead.
* Precedence of operator TYPE was 5 in original Wasm source. It has
* been changed to 4, as described in the Masm docs. This allows syntax
* "TYPE DWORD ptr xxx"
* v2.02: another case which is problematic:
* mov al,BYTE PTR CS:[]
* Since PTR and ':' have the very same priority, the evaluator will
* first calculate 'BYTE PTR CS'. This is invalid, but didn't matter
* prior to v2.02 because register coercion was never checked for
* plausibility. Solution: priority of ':' is changed from 4 to 3.
*/
switch( item->token ) {
case T_UNARY_OPERATOR:
case T_BINARY_OPERATOR:
return( item->precedence );
case T_OP_BRACKET:
case T_OP_SQ_BRACKET:
/* v2.08: with -Zm, the priority of [] and (), if
* used as binary operator, is 9 (like binary +/-).
* test cases: mov ax,+5[bx]
* mov ax,-5[bx]
*/
//return( 1 );
return( ModuleInfo.m510 ? 9 : 1 );
case T_DOT:
return( 2 );
case T_COLON:
//return( 4 );
return( 3 ); /* changed for v2.02 */
case '*':
case '/':
return( 8 );
case '+':
case '-':
return( item->specval ? 9 : 7 );
}
/* shouldn't happen! */
DebugMsg(("get_precedence: unexpected operator=%s\n", item->string_ptr));
fnEmitErr( SYNTAX_ERROR_EX, item->string_ptr );
return( ERROR );
}
#if 0
static bool is_operator( enum tok_type tt )
/*****************************************/
/* determine if token is an operator */
{
/* T_OP_BRACKET and above: "(,[,],},:,.,+,-,*,/" */
/* rest: T_REG, T_STYPE, T_RES_ID, T_ID, T_STRING,
* T_NUM, T_FLOAT, T_BAD_NUM, T_DBL_COLON, T_PERCENT
*/
return( tt >= T_OP_BRACKET || tt == T_UNARY_OPERATOR || tt == T_BINARY_OPERATOR );
}
static bool is_unary_op( enum tok_type tt )
/*****************************************/
/* determine if token is an unary operator */
{
return( tt == T_OP_BRACKET || tt == T_OP_SQ_BRACKET || tt == '+' || tt == '-' || tt == T_UNARY_OPERATOR );
}
#else
#define is_operator( tt ) ( tt >= T_OP_BRACKET || tt == T_UNARY_OPERATOR || tt == T_BINARY_OPERATOR )
#define is_unary_op( tt ) ( tt == T_OP_BRACKET || tt == T_OP_SQ_BRACKET || tt == '+' || tt == '-' || tt == T_UNARY_OPERATOR )
#endif
/* get value for simple types
* NEAR, FAR and PROC are handled slightly differently:
* the HIBYTE is set to 0xFF, and PROC depends on the memory model
*/
static unsigned int GetTypeSize( enum memtype mem_type, int Ofssize )
/*******************************************************************/
{
if ( (mem_type & MT_SPECIAL) == 0 )
return( ( mem_type & MT_SIZE_MASK ) + 1 );
if ( Ofssize == USE_EMPTY )
Ofssize = ModuleInfo.Ofssize;
switch ( mem_type ) {
case MT_NEAR: return ( 0xFF00 | ( 2 << Ofssize ) ) ;
case MT_FAR: return ( ( Ofssize == USE16 ) ? LS_FAR16 : 0xFF00 | ( ( 2 << Ofssize ) + 2 ) );
}
/* shouldn't happen */
return( 0 );
}
#if AMD64_SUPPORT
static uint_64 GetRecordMask( struct dsym *record )
#else
static uint_32 GetRecordMask( struct dsym *record )
#endif
/*************************************************/
{
#if AMD64_SUPPORT
uint_64 mask = 0;
#else
uint_32 mask = 0;
#endif
int i;
struct sfield *fl;
for ( fl = record->e.structinfo->head; fl; fl = fl->next ) {
struct asym *sym = &fl->sym;
for ( i = sym->offset ;i < sym->offset + sym->total_size; i++ )
mask |= 1 << i;
}
return( mask );
}
/* v2.06: the value of number strings is now evaluated here.
* Prior to v2.06, it was evaluated in the tokenizer and the
* value was stored in the token string buffer. Since the content
* of the token buffer is no longer destroyed when macros or
* generated code is run, the old strategy needed too much space.
*/
void myatoi128( const char *src, uint_64 dst[], int base, int size )
/******************************************************************/
{
uint_32 val;
unsigned len;
const char *end = src + size;
uint_16 *px;
dst[0] = 0;
dst[1] = 0;
do {
val = ( *src <= '9' ? *src - '0' : ( *src | 0x20 ) - 'a' + 10 );
px = (uint_16 *)dst;
for ( len = ( 2 * sizeof( uint_64 ) ) >> 1; len; len-- ) {
val += (uint_32)*px * base;
*(px++) = val;
val >>= 16;
};
//myassert( val == 0 ); /* if number doesn't fit in 128 bits */
src++;
} while( src < end );
return;
}
/* get an operand. operands are:
* - integer constant : EXPR_CONST
* - quoted string : EXPR_CONST
* - register : EXPR_REG (indirect = 1/0)
* - user identifier (T_ID): EXPR_ADDR | EXPR_CONST
* - reserved ID (T_RES_ID): EXPR_CONST ( EXPR_ADDR if id=FLAT )
* - float constant : EXPR_FLOAT
*
* valid user identifiers are
* - TYPE ( struct/union, typedef, record )
* - STRUCT FIELD (also bitfield)
* - variable (internal, external, stack ) or constant (EQU, '=')
* valid reserved IDs are types (BYTE, WORD, ... ) and FLAT
*/
static ret_code get_operand( struct expr *opnd, int *idx, struct asm_tok tokenarray[], const uint_8 flags )
/*********************************************************************************************************/
{
char *tmp;
struct asym *sym;
int i = *idx;
int j;
char labelbuff[16];/* for anonymous labels */
DebugMsg1(("%u get_operand(idx=%u >%s<) enter [memtype=%Xh]\n", evallvl, i, tokenarray[i].tokpos, opnd->mem_type ));
switch( tokenarray[i].token ) {
case T_NUM:
DebugMsg1(("%u get_operand: T_NUM, %s, base=%u, len=%u\n", evallvl, tokenarray[i].string_ptr, tokenarray[i].numbase, tokenarray[i].itemlen ));
opnd->kind = EXPR_CONST;
myatoi128( tokenarray[i].string_ptr, &opnd->llvalue, tokenarray[i].numbase, tokenarray[i].itemlen );
//opnd->llvalue = tokenarray[i].value64;
//opnd->hlvalue = ( tokenarray[i].numflg == NF_NULL ? 0 : *(uint_64 *)( tokenarray[i].string_ptr - sizeof(uint_64) ) );
break;
case T_STRING:
DebugMsg1(("%u get_operand: T_STRING, %s, size=%u\n", evallvl, tokenarray[i].string_ptr, tokenarray[i].stringlen ));
/* string enclosed in <> or {} are rejected since v1.94! */
if ( tokenarray[i].string_delim != '"' && tokenarray[i].string_delim != '\'') {
if ( opnd->is_opattr ) /* OPATTR operator accepts anything! */
break;
/* v2.0: display a comprehensible error msg if a quote is missing */
if ( tokenarray[i].string_delim == NULLC &&
( *tokenarray[i].string_ptr == '"' || *tokenarray[i].string_ptr == '\'' ))
fnEmitErr( MISSING_QUOTATION_MARK_IN_STRING );
else
fnEmitErr( UNEXPECTED_LITERAL_FOUND_IN_EXPRESSION, tokenarray[i].tokpos );
return( ERROR );
}
opnd->kind = EXPR_CONST;
opnd->quoted_string = &tokenarray[i];
//opnd->value = 0;
tmp = tokenarray[i].string_ptr + 1; /* skip the quote */
/* v2.06: use max. 16 bytes to create the "value".
* Prior to 2.06, max 8 bytes were used for 64-bit and
* max 4 bytes were used for 16-/32-bit.
*/
j = ( tokenarray[i].stringlen > sizeof( opnd->chararray ) ? sizeof( opnd->chararray ) : tokenarray[i].stringlen );
for( ; j; j-- )
opnd->chararray[j-1] = *tmp++;
break;
case T_REG:
DebugMsg1(( "%u get_operand: T_REG, string=%s, tokval=%u, regno=%u\n", evallvl, tokenarray[i].string_ptr, tokenarray[i].tokval, tokenarray[i].bytval ));
opnd->kind = EXPR_REG;
opnd->base_reg = &tokenarray[i];
j = tokenarray[i].tokval;
/* check if cpu is sufficient for register */
if( ( ( GetCpuSp( j ) & P_EXT_MASK ) &&
(( GetCpuSp( j ) & ModuleInfo.curr_cpu & P_EXT_MASK) == 0) ||
( ModuleInfo.curr_cpu & P_CPU_MASK ) < ( GetCpuSp( j ) & P_CPU_MASK ) ) ) {
/* v2.11: do not exit in indirect mode; avoids additional syntax error caused by ']' */
if ( flags & EXPF_IN_SQBR ) {
opnd->kind = EXPR_ERROR;
fnEmitErr( INSTRUCTION_OR_REGISTER_NOT_ACCEPTED_IN_CURRENT_CPU_MODE );
} else
return( fnEmitErr( INSTRUCTION_OR_REGISTER_NOT_ACCEPTED_IN_CURRENT_CPU_MODE ) );
}
if( flags & EXPF_IN_SQBR ) {
/* a valid index register? */
if ( GetSflagsSp( j ) & SFR_IREG ) {
opnd->indirect = TRUE;
opnd->assumecheck = TRUE;
} else if ( GetValueSp( j ) & OP_SR ) {
/* a segment register inside square brackets is only
* accepted by Masm if it is the segment part of an
* address (mov ax,[bx+cs:label])!
*/
/* v2.10: check moved here avain. regression v2.08-2.09, where
* it was in colon_op(). see regression test OVERRID3.ASC.
*/
//if( tokenarray[i+1].token != T_COLON ) {
if( tokenarray[i+1].token != T_COLON ||
( Options.strict_masm_compat && tokenarray[i+2].token == T_REG ) ) {
return( fnEmitErr( INVALID_USE_OF_REGISTER ) );
}
} else {
if ( opnd->is_opattr ) /* v2.11: just set error for opattr */
opnd->kind = EXPR_ERROR;
else
return( fnEmitErr( MUST_BE_INDEX_OR_BASE_REGISTER ) );
}
}
break;
case T_ID:
tmp = tokenarray[i].string_ptr;
//if ( opnd->type ) { /* v2.11 */
if ( opnd->is_dot ) {
DebugMsg1(("%u get_operand: T_ID, is_dot=1, id=%s, opnd.type=%s\n", evallvl, tokenarray[i].string_ptr, opnd->type ? opnd->type->name : "NULL" ));
opnd->value = 0;
sym = ( opnd->type ? SearchNameInStruct( opnd->type, tmp, &opnd->uvalue, 0 ) : NULL );
DebugMsg1(("get_operand(%s): is_dot, sym=%s, offset=%" I32_SPEC "Xh\n",
tmp, sym ? sym->name : "NULL", opnd->uvalue ));
if ( sym == NULL ) {
sym = SymSearch( tmp );
if ( sym ) {
/*
* skip a type specifier matching the data item's type
* that's something like "<item>.<type>.<member>"
*/
if ( sym->state == SYM_TYPE ) {
/*
* v2.07: "if" added.
* Masm accepts a different type spec if the "assumed"
* type is undefined
* v2.09: the change in v2.07 is a regression. if it's a type,
* then "usually" assume a type coercion and "switch" to the
* new type - but not for register assume. This isn't fixed
* yet, because there's no way to find out if a register assume
* did set field 'type'.
* v2.09: oldstructs condition added, see regression test dotop4.asm.
* v2.11: fixme? opnd->type may be NULL here?
* v2.12: for opnd->type==NULL test case, see expr5.aso.
*/
//if ( sym == opnd->type || opnd->type->isdefined == FALSE )
//if ( sym == opnd->type || opnd->type->isdefined == FALSE || ModuleInfo.oldstructs )
if ( sym == opnd->type || ( opnd->type && opnd->type->isdefined == FALSE ) || ModuleInfo.oldstructs )
; //opnd->sym = sym;
else {
sym = NULL;
}
} else if ( ModuleInfo.oldstructs &&
( sym->state == SYM_STRUCT_FIELD ||
sym->state == SYM_EXTERNAL || /* v2.01: added */
/* v2.05: changed */
//( sym->state == SYM_INTERNAL && sym->mem_type == MT_ABS ) ) )
sym->state == SYM_INTERNAL ) )
//opnd->sym = sym;
;
else {
/* fixme: clear sym?
* if the symbol is not a type, it's an error which can
* be detected in pass 1 already. dot_op() will emit
* 'struct field expected' if sym isn't cleared.
* v2.11: always clear sym.
*/
//if ( opnd->type != nullstruct )
sym = NULL;
}
}
}
} else {
DebugMsg1(("%u get_operand: T_ID, id=%s\n", evallvl, tokenarray[i].string_ptr ));
/* ensure anonym labels are uppercase */
/* v2.06: changed. Previously member 'string_ptr' was used to
* store the anonymous label, but one cannot safely assume that
* there's enough free space for a larger symbol name! It (partly)
* worked by accident, because @F/@B usually are the last tokens
* in a line [ but see: .if ( eax == @F && ecx == 2 ) ].
*/
if ( *tmp == '@' && *(tmp+2 ) == NULLC ) {
if ( *(tmp+1) == 'b' || *(tmp+1 ) == 'B' )
tmp = GetAnonymousLabel( labelbuff, 0 );
else if (*(tmp+1) == 'f' || *(tmp+1 ) == 'F' )
tmp = GetAnonymousLabel( labelbuff, 1 );
}
sym = SymSearch( tmp );
}
if ( sym == NULL ||
sym->state == SYM_UNDEFINED ||
( sym->state == SYM_TYPE && sym->typekind == TYPE_NONE ) || /* v2.10: added */
#if ALIAS_IN_EXPR == 0
sym->state == SYM_ALIAS || /* v2.04: added */
#endif
sym->state == SYM_MACRO ||
sym->state == SYM_TMACRO ) {
/* for OPATTR, anything is ok */
if ( opnd->is_opattr ) {
DebugMsg1(( "get_operand(%s): OPATTR, symbol invalid\n", tokenarray[i].string_ptr ));
opnd->kind = EXPR_ERROR;
break;
}
#if 0 /* v2.10: obsolete, since fnEmitErr() won't display anything in "EQU" mode */
/* if it is EQU, don't display an error, but return ERROR */
if ( flags & EXPF_NOERRMSG ) {
DebugMsg1(("get_operand(%s): EQU, symbol invalid\n", tokenarray[i].string_ptr));
return( ERROR );
}
#endif
if ( sym && ( sym->state == SYM_MACRO ||
#if ALIAS_IN_EXPR == 0
sym->state == SYM_ALIAS || /* v2.04: added */
#endif
sym->state == SYM_TMACRO ) ) {
DebugMsg1(("get_operand(%s): symbol is macro/textmacro/alias!\n", tokenarray[i].string_ptr));
fnEmitErr( INVALID_SYMBOL_TYPE_IN_EXPRESSION, sym->name );
return( ERROR );
}
/* v2.11: flag EXPF_NOUNDEF won't accept undefined symbols anymore.
* previously, it did just avoid to create a label with state SYM_UNDEFINED -
* hence the old name, EXPF_NOLCREATE
*/
//if( Parse_Pass == PASS_1 ) {
if( Parse_Pass == PASS_1 && !( flags & EXPF_NOUNDEF ) ) {
/* if symbol wasn't found, assume it is a forward ref! */
if ( sym == NULL ) {
/* v2.11: flag EXPF_NOLCREATE has got another meaning */
//if ( opnd->type == NULL && !( flags & EXPF_NOLCREATE ) ) { /* added v1.95 */
if ( opnd->type == NULL ) {
sym = SymLookup( tmp );
sym->state = SYM_UNDEFINED;
sym_add_table( &SymTables[TAB_UNDEF], (struct dsym *)sym ); /* add UNDEFINED */
DebugMsg1(("get_operand(%s): symbol not (yet) defined, CurrProc=%s\n", tmp, CurrProc ? CurrProc->sym.name : "NULL" ));
// } else if ( opnd->type == NULL || opnd->type != nullstruct ) { /* v2.08: if changed */
// } else if ( opnd->type == NULL || opnd->type->typekind != TYPE_NONE ) { /* v2.11: if changed */
} else if ( opnd->type->typekind != TYPE_NONE ) {
/* no struct or struct is known and defined */
DebugMsg(("get_operand(%s): symbol error (type=%s typekind=%u)\n", tmp, opnd->type ? opnd->type->name : "NULL", opnd->type ? opnd->type->typekind : 0 ));
if ( *opnd->type->name )
fnEmitErr( MEMBER_NOT_DEFINED, opnd->type->name, tmp );
else
fnEmitErr( SYMBOL_NOT_DEFINED, tmp );
return( ERROR );
} else {
/* forward reference to a struct.
* In these cases, assume everything is ok.
*/
if ( !nullmbr ) {
nullmbr = SymAlloc( "" );
}
DebugMsg(("get_operand(%s): forward reference to a struct (using nullmbr)\n", tmp ));
/* "break" because nullmbr has state SYM_UNDEFINED */
opnd->mbr = nullmbr;
opnd->kind = EXPR_CONST;
break;
}
}
} else {
DebugMsg1(("get_operand(%s): symbol %s not defined, pass > 1, curr proc=>%s<, \n", tokenarray[i].string_ptr, tmp, CurrProc ? CurrProc->sym.name : "NULL" ));
if ( opnd->type && *opnd->type->name ) {
fnEmitErr( MEMBER_NOT_DEFINED, opnd->type->name, tmp );
} else {
fnEmitErr( SYMBOL_NOT_DEFINED, *(tmp+1) == '&' ? "@@" : tmp );
}
return( ERROR );
}
#if ALIAS_IN_EXPR /* v2.04b: added */
} else if ( sym->state == SYM_ALIAS ) {
/* ALIAS symbols are not really useable in expressions.
* The alias' substitute symbol is, however.
*/
sym = sym->substitute; /* can't be NULL */
#endif
}
/* set default values */
sym->used = TRUE;
DebugMsg1(("get_operand(%s): sym->state=%u type=>%s< ofs=%X memtype=%Xh total_size=%u defined=%u\n",
tokenarray[i].string_ptr, sym->state, sym->type ? sym->type->name : "NULL", sym->offset, sym->mem_type, sym->total_size, sym->isdefined ));
switch ( sym->state ) {
case SYM_TYPE: /* STRUCT, UNION, RECORD, TYPEDEF */
/* v2.09: no structinfo data for typedefs */
if ( sym->typekind != TYPE_TYPEDEF && ((struct dsym *)sym)->e.structinfo->isOpen ) {
DebugMsg1(("get_operand(%s): struct/union definition isn't closed!\n", sym->name ));
opnd->kind = EXPR_ERROR;
break;
}
/* skip "alias" types */
for ( ; sym->type; sym = sym->type );
opnd->kind = EXPR_CONST;
opnd->mem_type = sym->mem_type;
opnd->is_type = TRUE;
opnd->type = sym;
DebugMsg1(("get_operand(%s): symbol.typekind=%u (STRUCT/UNION/TYPEDEF/RECORD)\n", sym->name, sym->typekind ));
/* v2.08: if() removed. This was an old hack. */
//if ( tokenarray[i-1].token != T_DOT && tokenarray[i+1].token != T_DOT )
/* v2.06: the default value for RECORD types is the mask value */
if ( sym->typekind == TYPE_RECORD ) {
#if AMD64_SUPPORT
opnd->llvalue = GetRecordMask( (struct dsym *)sym );
#else
opnd->value = GetRecordMask( (struct dsym *)sym );
#endif
} else if ( ( sym->mem_type & MT_SPECIAL_MASK ) == MT_ADDRESS ) { /* v2.09: added */
if ( sym->mem_type == MT_PROC ) {
opnd->value = sym->total_size;
opnd->Ofssize = sym->Ofssize;
} else
opnd->value = GetTypeSize( sym->mem_type, sym->Ofssize );
} else
opnd->value = sym->total_size;
break;
case SYM_STRUCT_FIELD:
DebugMsg1(("get_operand(%s): structure field, ofs=%Xh\n", sym->name, sym->offset ));
/* opnd->value might have been set by SearchNameInStruct() already! */
opnd->value += sym->offset;
opnd->kind = EXPR_CONST;
opnd->mbr = sym;
/* skip "alias" types (probably obsolete by now!) */
for ( ; sym->type; sym = sym->type );
opnd->mem_type = sym->mem_type;
/*
* check if the member field is a type (struct or union).
* If yes, set the <type> member!
* this cannot be done in PrepareOp()
*/
opnd->type = ( sym->state == SYM_TYPE && sym->typekind != TYPE_TYPEDEF ) ? sym : NULL;
DebugMsg1(("get_operand: mem_type=%Xh type=%s\n", opnd->mem_type, opnd->type ? opnd->type->name : "NULL" ));
break;
default: /* SYM_INTERNAL, SYM_EXTERNAL, SYM_SEG, SYM_GRP, SYM_STACK */
opnd->kind = EXPR_ADDR;
/* call internal function (@Line, ... ) */
if ( sym->predefined && sym->sfunc_ptr )
sym->sfunc_ptr( sym, NULL );
//if( opnd->sym->mem_type == MT_ABS ) {
if( sym->state == SYM_INTERNAL && sym->segment == NULL ) {
opnd->kind = EXPR_CONST;
opnd->uvalue = sym->uvalue;
opnd->hvalue = sym->value3264;
DebugMsg1(("get_operand(%s): equate hval=%Xh, lval=%Xh\n", sym->name, opnd->hvalue, opnd->uvalue ));
opnd->mem_type = sym->mem_type;
/* don't set the symbol reference, it isn't a label */
} else if( sym->state == SYM_EXTERNAL &&
sym->mem_type == MT_EMPTY &&
sym->iscomm == FALSE ) {
/* type remains EXPR_ADDR, to force fixup creation */
//opnd->mem_type = sym->mem_type; /* v2.10: unnecessary, init value IS MT_EMPTY */
opnd->is_abs = TRUE;
opnd->sym = sym;
} else {
opnd->label_tok = &tokenarray[i];
/* a variable with arbitrary type? */
/* v2.05: added check for MT_EMPTY */
//if( opnd->sym->type ) {
if( sym->type && sym->type->mem_type != MT_EMPTY ) {
/* skip "alias" types */
/* v2.05: obsolete */
//for ( sym2 = opnd->sym; sym2->type; sym2 = sym2->type );
//opnd->mem_type = sym2->mem_type;
opnd->mem_type = sym->type->mem_type;
} else {
opnd->mem_type = sym->mem_type;
}
/* since there is no fixup for auto variables, the "offset"
must be stored in the <value> field */
if ( sym->state == SYM_STACK ) {
#if STACKBASESUPP
opnd->llvalue = sym->offset + StackAdj;
#else
opnd->llvalue = sym->offset;
#endif
opnd->indirect = TRUE;
/* v2.10: base register values now set here */
opnd->base_reg = &tokenarray[i];
#if STACKBASESUPP
tokenarray[i].tokval = CurrProc->e.procinfo->basereg;
#else
tokenarray[i].tokval = basereg[ModuleInfo.Ofssize];
#endif
tokenarray[i].bytval = GetRegNo( tokenarray[i].tokval );
}
opnd->sym = sym;
/* v2.09: added (also see change in PrepareOp() )
* and see case SYM_STRUCT_FIELD.
*/
for ( ; sym->type; sym = sym->type );
opnd->type = ( sym->state == SYM_TYPE && sym->typekind != TYPE_TYPEDEF ) ? sym : NULL;
}
break;
}
break;
case T_STYPE:
DebugMsg1(("%u get_operand: T_STYPE (>%s<, value=%X)\n", evallvl, tokenarray[i].string_ptr, tokenarray[i].tokval));
opnd->kind = EXPR_CONST;
/* for types, return the size as numeric constant */
/* fixme: mem_type should be set only when used as first arg of PTR op! */
opnd->mem_type = GetMemtypeSp( tokenarray[i].tokval );
opnd->Ofssize = GetSflagsSp( tokenarray[i].tokval );
opnd->value = GetTypeSize( opnd->mem_type, opnd->Ofssize );
opnd->is_type = TRUE;
opnd->type = NULL; /* v2.08: added */
break;
case T_RES_ID:
DebugMsg1(("%u get_operand: T_RES_ID (>%s<, value=%X)\n", evallvl, tokenarray[i].string_ptr, tokenarray[i].tokval));
if ( tokenarray[i].tokval == T_FLAT ) {
/* v2.09: query NOUNDEF flag */
//if ( error_msg ) { /* don't define FLAT group in EQU expression! */
if ( ( flags & EXPF_NOUNDEF ) == 0 ) {
/* v2.08 cpu check added */
if( ( ModuleInfo.curr_cpu & P_CPU_MASK ) < P_386 ) {
fnEmitErr( INSTRUCTION_OR_REGISTER_NOT_ACCEPTED_IN_CURRENT_CPU_MODE );
return( ERROR );
}
DefineFlatGroup();
}
if ( !( opnd->sym = &ModuleInfo.flat_grp->sym ) )
return( ERROR );
opnd->label_tok = &tokenarray[i];
opnd->kind = EXPR_ADDR;
} else {
return( fnEmitErr( SYNTAX_ERROR_EX, tokenarray[i].string_ptr ) );
}
break;
case T_FLOAT: /* v2.05 */
DebugMsg1(("%u get_operand: T_FLOAT (>%s<)\n", evallvl, tokenarray[i].string_ptr ));
opnd->kind = EXPR_FLOAT;
opnd->float_tok = &tokenarray[i];
//opnd->ftype = ( tokenarray[i].floattype != 0 );
break;
//case T_CL_BRACKET:
//case T_CL_SQ_BRACKET:
default:
DebugMsg1(("%u get_operand: default (token=%u, string=%s)\n", evallvl, tokenarray[i].token, tokenarray[i].string_ptr));
if ( opnd->is_opattr ) { /* for OPATTR, allow any operand */
if ( tokenarray[i].token == T_FINAL ||
tokenarray[i].token == T_CL_BRACKET ||
tokenarray[i].token == T_CL_SQ_BRACKET ) /* don't go beyond T_FINAL, ) or ] ! */
return( NOT_ERROR );
break;
}
if ( tokenarray[i].token == T_BAD_NUM )
/* Masm complains even if in EQU-mode */
fnEmitErr( NONDIGIT_IN_NUMBER, tokenarray[i].string_ptr );
else if ( tokenarray[i].token == T_COLON )
fnEmitErr( SYNTAX_ERROR_UNEXPECTED_COLON );
else if ( isalpha( *tokenarray[i].string_ptr ) )
fnEmitErr( EXPRESSION_EXPECTED, tokenarray[i].tokpos ); /* better error msg */
else
fnEmitErr( SYNTAX_ERROR_EX, tokenarray[i].tokpos );
return( ERROR );
}
(*idx)++;
DebugMsg1(("%u get_operand exit, ok, kind=%d value=%" I64_SPEC "X hvalue=%" I64_SPEC "X mem_type=%Xh abs=%u string=%s is_type=%u type=>%s< sym=%s mbr=%s\n",
evallvl, opnd->kind, opnd->llvalue, opnd->hlvalue, opnd->mem_type, opnd->is_abs,
opnd->quoted_string ? opnd->quoted_string->string_ptr : "NULL",
opnd->is_type, opnd->type ? opnd->type->name : "NULL",
opnd->sym ? opnd->sym->name : "NULL",
opnd->mbr ? opnd->mbr->name : "NULL" ));
return( NOT_ERROR );
}
#if 0
static bool check_same( struct expr *opnd1, struct expr *opnd2, enum exprtype kind )
/**********************************************************************************/
/* Check if both tok_1 and tok_2 equal type */
{
return( ( opnd1->kind == kind && opnd2->kind == kind ) ? TRUE : FALSE );
}
#else
#define check_same( first, second, KIND ) ( first->kind == KIND && second->kind == KIND )
#endif
static bool check_both( const struct expr *opnd1, const struct expr *opnd2, enum exprtype type1, enum exprtype type2 )
/********************************************************************************************************************/
/* Check if tok_1 == type1 and tok_2 == type2 or vice versa */
{
if( opnd1->kind == type1 && opnd2->kind == type2 )
return( TRUE );
if( opnd1->kind == type2 && opnd2->kind == type1 )
return( TRUE );
return( FALSE );
}
static ret_code index_connect( struct expr *opnd1, const struct expr *opnd2 )
/***************************************************************************/
/* Connects the register lists. called by plus_op() and dot_op() */
{
/* move opnd2.base to either opnd1.base or opnd1.idx */
if ( opnd2->base_reg != NULL ) {
if ( opnd1->base_reg == NULL )
opnd1->base_reg = opnd2->base_reg;
else if ( opnd1->idx_reg == NULL ) {
/* v2.10: exchange base and index register.
* was previously in parser.c, and only done
* if -Zg was active.
*/
if ( opnd1->base_reg->bytval != 4 ) { /* if base isn't [E|R]SP, exchange regs */
opnd1->idx_reg = opnd1->base_reg;
opnd1->base_reg = opnd2->base_reg;
} else {
opnd1->idx_reg = opnd2->base_reg;
}
} else {
return( fnEmitErr( MULTIPLE_INDEX_REGISTERS_NOT_ALLOWED ) );
}
opnd1->indirect = TRUE;
}
/* move opnd2.idx to opnd1.index - if it is free */
if( opnd2->idx_reg != NULL ) {
//if ( opnd2->scale == 0 && opnd1->base_reg == NULL ) {
// opnd1->base_reg = opnd2->idx_reg;
//} else if ( opnd1->idx_reg == NULL ) {
if ( opnd1->idx_reg == NULL ) {
opnd1->idx_reg = opnd2->idx_reg;
opnd1->scale = opnd2->scale;
} else {
return( fnEmitErr( MULTIPLE_INDEX_REGISTERS_NOT_ALLOWED ) );
}
opnd1->indirect = TRUE;
}
return( NOT_ERROR );
}
/* convert an address operand to a const operand if possible.
* called for '*', '/', '+', '-' and binary (EQ,NE, ... SHL, SHR, ... OR,AND,XOR) operators.
* the main purpose is: if a forward reference is included,
* assume it is referencing a constant, not a label.
*/
static void MakeConst( struct expr *opnd )
/****************************************/
{
if( ( opnd->kind != EXPR_ADDR ) || opnd->indirect ) /* v2.09: check for indirect added */
return;
if( opnd->sym ) {
if ( Parse_Pass > PASS_1 )
return;
/* added for v1.94: if the evaluator assumed an address because
* the label wasn't defined yet, then negate this. Also, an
* EXTERNDEF:ABS is to be accepted.
* v2.07: if the "not yet defined" label was an argument of
* an (OFFSET) operator, do NOT change the type!
*/
if ( ( opnd->sym->state == SYM_UNDEFINED && opnd->instr == EMPTY ) ||
( opnd->sym->state == SYM_EXTERNAL && opnd->sym->weak == TRUE && opnd->is_abs == TRUE ) )
;
else
return;
/* assume a value != 0 to avoid problems with div */
opnd->value = 1;
}
opnd->label_tok = NULL;
if( opnd->mbr != NULL ) {
if( opnd->mbr->state == SYM_STRUCT_FIELD ) {
#if 0 /* v2.09: mbr can only be SYM_STRUCT_FIELD or SYM_UNDEFINED (if nullmbr) */
} else if( opnd->mbr->state == SYM_TYPE ) {
opnd->value += opnd->mbr->total_size;
opnd->mbr = NULL;
#endif
} else {
return;
}
}
#if 0 /* v2.09: obsolete */
if( opnd->base_reg != NULL )
return;
if( opnd->idx_reg != NULL )
return;
#endif
if( opnd->override != NULL )
return;
opnd->instr = EMPTY;
opnd->kind = EXPR_CONST;
//opnd->indirect = FALSE; /* not needed */
opnd->explicit = FALSE;
opnd->mem_type = MT_EMPTY;
}
/* used by EQ, NE, GT, GE, LE, LT if item is a direct address
*/
static ret_code MakeConst2( struct expr *opnd1, struct expr *opnd2 )
/******************************************************************/
{
if ( opnd1->sym->state == SYM_EXTERNAL ) {
return( fnEmitErr( INVALID_USE_OF_EXTERNAL_SYMBOL, opnd1->sym->name ) );
} else if ( ( opnd1->sym->segment != opnd2->sym->segment &&
/* v2.07: ignore segments if at least one label is a fwd ref */
opnd1->sym->state != SYM_UNDEFINED &&
opnd2->sym->state != SYM_UNDEFINED ) ||
opnd2->sym->state == SYM_EXTERNAL ) {
return( fnEmitErr( OPERANDS_MUST_BE_IN_SAME_SEGMENT ) );
}
opnd1->kind = EXPR_CONST;
opnd1->value += opnd1->sym->offset;
opnd2->kind = EXPR_CONST;
opnd2->value += opnd2->sym->offset;
return( NOT_ERROR );
}
static ret_code ConstError( struct expr *opnd1, struct expr *opnd2 )
/******************************************************************/
{
if ( opnd1->is_opattr )
return( NOT_ERROR );
if ( opnd1->kind == EXPR_FLOAT || opnd2->kind == EXPR_FLOAT )
fnEmitErr( REAL_OR_BCD_NUMBER_NOT_ALLOWED );
else
fnEmitErr( CONSTANT_EXPECTED );
return( ERROR );
}
/* used by + and - binary operators */
static void fix_struct_value( struct expr *opnd )
/***********************************************/
{
if( opnd->mbr && ( opnd->mbr->state == SYM_TYPE ) ) {
opnd->value += opnd->mbr->total_size;
opnd->mbr = NULL;
}
}
static int check_direct_reg( const struct expr *opnd1, const struct expr *opnd2 )
/*******************************************************************************/
{
if( ( opnd1->kind == EXPR_REG ) && ( opnd1->indirect == FALSE )
|| ( opnd2->kind == EXPR_REG ) && ( opnd2->indirect == FALSE ) ) {
return( ERROR );
}
return( NOT_ERROR );
}
static unsigned GetSizeValue( struct asym *sym )
/**********************************************/
{
if ( sym->mem_type == MT_PTR )
return( SizeFromMemtype( sym->isfar ? MT_FAR : MT_NEAR, sym->Ofssize, sym->type ) );
return( SizeFromMemtype( sym->mem_type, sym->Ofssize, sym->type ) );
}
static unsigned IsOffset( struct expr *opnd )
/*******************************************/
{
if ( opnd->mem_type == MT_EMPTY )
if ( opnd->instr == T_OFFSET ||
#if IMAGERELSUPP
opnd->instr == T_IMAGEREL ||
#endif
#if SECTIONRELSUPP
opnd->instr == T_SECTIONREL ||
#endif
opnd->instr == T_LROFFSET )
return( 1 );
return( 0 );
}
static ret_code invalid_operand( struct expr *opnd, char *oprtr, char *operand )
/******************************************************************************/
{
if ( !opnd->is_opattr )
fnEmitErr( INVALID_OPERAND_FOR_OPERATOR, _strupr( oprtr), operand );
return( ERROR );
}
/* operators
* LENGTH: number of items of first initializer's first dimension
* SIZE: size in bytes of first initializer's first dimension
* LENGTHOF: number of elements in an array
* SIZEOF: size in bytes of item (array/struct)
*