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wine/debugger/expr.c

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/*
* File expr.c - expression handling for Wine internal debugger.
*
* Copyright (C) 1997, Eric Youngdale.
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "winbase.h"
#include "wine/winbase16.h"
#include "task.h"
#include "debugger.h"
#include "expr.h"
#include <stdarg.h>
struct expr
{
unsigned int perm;
unsigned int type:31;
union
{
struct
{
int value;
} constant;
struct
{
const char * str;
} string;
struct
{
unsigned int value;
} u_const;
struct
{
const char * name;
} symbol;
struct
{
enum debug_regs reg;
int result;
} rgister;
struct
{
int unop_type;
struct expr * exp1;
int result;
} unop;
struct
{
int binop_type;
int result;
struct expr * exp1;
struct expr * exp2;
} binop;
struct
{
struct datatype * cast;
struct expr * expr;
} cast;
struct
{
struct expr * exp1;
const char * element_name;
int result;
} structure;
struct
{
struct expr * base;
struct expr * index;
} array;
struct
{
const char * funcname;
int nargs;
int result;
struct expr * arg[5];
} call;
} un;
};
#define EXPR_TYPE_CONST 0
#define EXPR_TYPE_US_CONST 1
#define EXPR_TYPE_SYMBOL 2
#define EXPR_TYPE_REGISTER 3
#define EXPR_TYPE_BINOP 4
#define EXPR_TYPE_UNOP 5
#define EXPR_TYPE_STRUCT 6
#define EXPR_TYPE_PSTRUCT 7
#define EXPR_TYPE_ARRAY 8
#define EXPR_TYPE_CALL 9
#define EXPR_TYPE_STRING 10
#define EXPR_TYPE_CAST 11
static char expr_list[4096];
static int next_expr_free = 0;
/*
* This is how we turn an expression address into the actual value.
* This works well in the 32 bit domain - not sure at all about the
* 16 bit world.
*/
#define VAL(_exp) DEBUG_GetExprValue(&_exp, NULL)
static
struct expr *
DEBUG_GetFreeExpr()
{
struct expr * rtn;
rtn = (struct expr *) &expr_list[next_expr_free];
next_expr_free += sizeof(struct expr);
assert(next_expr_free < sizeof(expr_list));
return rtn;
}
void
DEBUG_FreeExprMem()
{
next_expr_free = 0;
}
struct expr *
DEBUG_TypeCastExpr(struct datatype * dt, struct expr * exp)
{
struct expr * ex;
ex = DEBUG_GetFreeExpr();
ex->type = EXPR_TYPE_CAST;
ex->un.cast.cast = dt;
ex->un.cast.expr = exp;
return ex;
}
struct expr *
DEBUG_RegisterExpr(enum debug_regs regno)
{
struct expr * ex;
ex = DEBUG_GetFreeExpr();
ex->type = EXPR_TYPE_REGISTER;
ex->un.rgister.reg = regno;
return ex;
}
struct expr *
DEBUG_SymbolExpr(const char * name)
{
struct expr * ex;
ex = DEBUG_GetFreeExpr();
ex->type = EXPR_TYPE_SYMBOL;
ex->un.symbol.name = name;
return ex;
}
struct expr *
DEBUG_ConstExpr(int value)
{
struct expr * ex;
ex = DEBUG_GetFreeExpr();
ex->type = EXPR_TYPE_CONST;
ex->un.constant.value = value;
return ex;
}
struct expr *
DEBUG_StringExpr(const char * str)
{
struct expr * ex;
char * pnt;
ex = DEBUG_GetFreeExpr();
ex->type = EXPR_TYPE_STRING;
ex->un.string.str = str+1;
pnt = strrchr(ex->un.string.str, '"');
if( pnt != NULL )
{
*pnt = '\0';
}
return ex;
}
struct expr *
DEBUG_USConstExpr(unsigned int value)
{
struct expr * ex;
ex = DEBUG_GetFreeExpr();
ex->type = EXPR_TYPE_CONST;
ex->un.u_const.value = value;
return ex;
}
struct expr *
DEBUG_BinopExpr(int operator_type, struct expr * exp1, struct expr * exp2)
{
struct expr * ex;
ex = DEBUG_GetFreeExpr();
ex->type = EXPR_TYPE_BINOP;
ex->un.binop.binop_type = operator_type;
ex->un.binop.exp1 = exp1;
ex->un.binop.exp2 = exp2;
return ex;
}
struct expr *
DEBUG_UnopExpr(int operator_type, struct expr * exp1)
{
struct expr * ex;
ex = DEBUG_GetFreeExpr();
ex->type = EXPR_TYPE_UNOP;
ex->un.unop.unop_type = operator_type;
ex->un.unop.exp1 = exp1;
return ex;
}
struct expr *
DEBUG_StructExpr(struct expr * exp, const char * element)
{
struct expr * ex;
ex = DEBUG_GetFreeExpr();
ex->type = EXPR_TYPE_STRUCT;
ex->un.structure.exp1 = exp;
ex->un.structure.element_name = element;
return ex;
}
struct expr *
DEBUG_StructPExpr(struct expr * exp, const char * element)
{
struct expr * ex;
ex = DEBUG_GetFreeExpr();
ex->type = EXPR_TYPE_PSTRUCT;
ex->un.structure.exp1 = exp;
ex->un.structure.element_name = element;
return ex;
}
struct expr *
DEBUG_CallExpr(const char * funcname, int nargs, ...)
{
struct expr * ex;
va_list ap;
int i;
ex = DEBUG_GetFreeExpr();
ex->type = EXPR_TYPE_CALL;
ex->un.call.funcname = funcname;
ex->un.call.nargs = nargs;
va_start(ap, nargs);
for(i=0; i < nargs; i++)
{
ex->un.call.arg[i] = va_arg(ap, struct expr *);
}
va_end(ap);
return ex;
}
DBG_ADDR
DEBUG_EvalExpr(struct expr * exp)
{
DBG_ADDR rtn;
int i;
DBG_ADDR exp1;
DBG_ADDR exp2;
unsigned int cexp[5];
int (*fptr)();
int scale1;
int scale2;
int scale3;
struct datatype * type1;
struct datatype * type2;
rtn.type = NULL;
rtn.off = NULL;
rtn.seg = NULL;
switch(exp->type)
{
case EXPR_TYPE_CAST:
rtn = DEBUG_EvalExpr(exp->un.cast.expr);
rtn.type = exp->un.cast.cast;
break;
case EXPR_TYPE_STRING:
rtn.type = DEBUG_TypeString;
rtn.off = (unsigned int) &exp->un.string.str;
rtn.seg = 0;
break;
case EXPR_TYPE_CONST:
rtn.type = DEBUG_TypeIntConst;
rtn.off = (unsigned int) &exp->un.constant.value;
rtn.seg = 0;
break;
case EXPR_TYPE_US_CONST:
rtn.type = DEBUG_TypeUSInt;
rtn.off = (unsigned int) &exp->un.u_const.value;
rtn.seg = 0;
break;
case EXPR_TYPE_SYMBOL:
if( !DEBUG_GetSymbolValue(exp->un.symbol.name, -1, &rtn, FALSE ) )
{
rtn.type = NULL;
rtn.off = 0;
rtn.seg = 0;
};
break;
case EXPR_TYPE_PSTRUCT:
exp1 = DEBUG_EvalExpr(exp->un.structure.exp1);
if( exp1.type == NULL )
{
break;
}
rtn.off = DEBUG_TypeDerefPointer(&exp1, &type1);
if( type1 == NULL )
{
break;
}
rtn.type = type1;
DEBUG_FindStructElement(&rtn, exp->un.structure.element_name,
&exp->un.structure.result);
break;
case EXPR_TYPE_STRUCT:
exp1 = DEBUG_EvalExpr(exp->un.structure.exp1);
if( exp1.type == NULL )
{
break;
}
rtn = exp1;
DEBUG_FindStructElement(&rtn, exp->un.structure.element_name,
&exp->un.structure.result);
break;
case EXPR_TYPE_CALL:
/*
* First, evaluate all of the arguments. If any of them are not
* evaluable, then bail.
*/
for(i=0; i < exp->un.call.nargs; i++)
{
exp1 = DEBUG_EvalExpr(exp->un.call.arg[i]);
if( exp1.type == NULL )
{
return rtn;
}
cexp[i] = DEBUG_GetExprValue(&exp1, NULL);
}
/*
* Now look up the address of the function itself.
*/
if( !DEBUG_GetSymbolValue(exp->un.call.funcname, -1, &rtn, FALSE ) )
{
fprintf(stderr, "Failed to find symbol\n");
break;
}
fptr = (int (*)()) rtn.off;
switch(exp->un.call.nargs)
{
case 0:
exp->un.call.result = (*fptr)();
break;
case 1:
exp->un.call.result = (*fptr)(cexp[0]);
break;
case 2:
exp->un.call.result = (*fptr)(cexp[0], cexp[1]);
break;
case 3:
exp->un.call.result = (*fptr)(cexp[0], cexp[1], cexp[2]);
break;
case 4:
exp->un.call.result = (*fptr)(cexp[0], cexp[1], cexp[2], cexp[3]);
break;
case 5:
exp->un.call.result = (*fptr)(cexp[0], cexp[1], cexp[2], cexp[3], cexp[4]);
break;
}
rtn.type = DEBUG_TypeInt;
rtn.off = (unsigned int) &exp->un.call.result;
break;
case EXPR_TYPE_REGISTER:
rtn.type = DEBUG_TypeIntConst;
exp->un.rgister.result = DEBUG_GetRegister(exp->un.rgister.reg);
rtn.off = (unsigned int) &exp->un.rgister.result;
#ifdef __i386__
if( exp->un.rgister.reg == REG_EIP )
rtn.seg = CS_reg(&DEBUG_context);
else
rtn.seg = DS_reg(&DEBUG_context);
#endif
DBG_FIX_ADDR_SEG( &rtn, 0 );
break;
case EXPR_TYPE_BINOP:
exp1 = DEBUG_EvalExpr(exp->un.binop.exp1);
exp2 = DEBUG_EvalExpr(exp->un.binop.exp2);
if( exp1.type == NULL || exp2.type == NULL )
{
break;
}
if( exp1.type == DEBUG_TypeIntConst && exp2.type == DEBUG_TypeIntConst )
{
rtn.type = exp1.type;
}
else
{
rtn.type = DEBUG_TypeInt;
}
rtn.off = (unsigned int) &exp->un.binop.result;
switch(exp->un.binop.binop_type)
{
case EXP_OP_ADD:
type1 = DEBUG_GetPointerType(exp1.type);
type2 = DEBUG_GetPointerType(exp2.type);
scale1 = 1;
scale2 = 1;
if( type1 != NULL && type2 != NULL )
{
break;
}
else if( type1 != NULL )
{
scale2 = DEBUG_GetObjectSize(type1);
rtn.type = exp1.type;
}
else if( type2 != NULL )
{
scale1 = DEBUG_GetObjectSize(type2);
rtn.type = exp2.type;
}
rtn.seg = 0;
exp->un.binop.result = (VAL(exp1) * scale1 + scale2 * VAL(exp2));
break;
case EXP_OP_SUB:
type1 = DEBUG_GetPointerType(exp1.type);
type2 = DEBUG_GetPointerType(exp2.type);
scale1 = 1;
scale2 = 1;
scale3 = 1;
if( type1 != NULL && type2 != NULL )
{
if( type1 != type2 )
{
break;
}
scale3 = DEBUG_GetObjectSize(type1);
}
else if( type1 != NULL )
{
scale2 = DEBUG_GetObjectSize(type1);
rtn.type = exp1.type;
}
else if( type2 != NULL )
{
scale1 = DEBUG_GetObjectSize(type2);
rtn.type = exp2.type;
}
rtn.seg = 0;
exp->un.binop.result = (VAL(exp1) - VAL(exp2)) / scale3;
break;
case EXP_OP_SEG:
rtn.seg = VAL(exp1);
exp->un.binop.result = VAL(exp2);
#ifdef __i386__
if (ISV86(&DEBUG_context)) {
TDB *pTask = (TDB*)GlobalLock16( GetCurrentTask() );
rtn.seg |= (DWORD)(pTask?(pTask->hModule):0)<<16;
GlobalUnlock16( GetCurrentTask() );
}
#endif
break;
case EXP_OP_LOR:
rtn.seg = 0;
exp->un.binop.result = (VAL(exp1) || VAL(exp2));
break;
case EXP_OP_LAND:
rtn.seg = 0;
exp->un.binop.result = (VAL(exp1) && VAL(exp2));
break;
case EXP_OP_OR:
rtn.seg = 0;
exp->un.binop.result = (VAL(exp1) | VAL(exp2));
break;
case EXP_OP_AND:
rtn.seg = 0;
exp->un.binop.result = (VAL(exp1) & VAL(exp2));
break;
case EXP_OP_XOR:
rtn.seg = 0;
exp->un.binop.result = (VAL(exp1) ^ VAL(exp2));
break;
case EXP_OP_EQ:
rtn.seg = 0;
exp->un.binop.result = (VAL(exp1) == VAL(exp2));
break;
case EXP_OP_GT:
rtn.seg = 0;
exp->un.binop.result = (VAL(exp1) > VAL(exp2));
break;
case EXP_OP_LT:
rtn.seg = 0;
exp->un.binop.result = (VAL(exp1) < VAL(exp2));
break;
case EXP_OP_GE:
rtn.seg = 0;
exp->un.binop.result = (VAL(exp1) >= VAL(exp2));
break;
case EXP_OP_LE:
rtn.seg = 0;
exp->un.binop.result = (VAL(exp1) <= VAL(exp2));
break;
case EXP_OP_NE:
rtn.seg = 0;
exp->un.binop.result = (VAL(exp1) != VAL(exp2));
break;
case EXP_OP_SHL:
rtn.seg = 0;
exp->un.binop.result = ((unsigned) VAL(exp1) << VAL(exp2));
break;
case EXP_OP_SHR:
rtn.seg = 0;
exp->un.binop.result = ((unsigned) VAL(exp1) >> VAL(exp2));
break;
case EXP_OP_MUL:
rtn.seg = 0;
exp->un.binop.result = (VAL(exp1) * VAL(exp2));
break;
case EXP_OP_DIV:
if( VAL(exp2) != 0 )
{
rtn.seg = 0;
exp->un.binop.result = (VAL(exp1) / VAL(exp2));
}
else
{
rtn.seg = 0;
rtn.type = NULL;
rtn.off = 0;
}
break;
case EXP_OP_REM:
if( VAL(exp2) != 0 )
{
rtn.seg = 0;
exp->un.binop.result = (VAL(exp1) % VAL(exp2));
}
else
{
rtn.seg = 0;
rtn.type = NULL;
rtn.off = 0;
}
break;
case EXP_OP_ARR:
DEBUG_ArrayIndex(&exp1, &rtn, VAL(exp2));
break;
default:
break;
}
break;
case EXPR_TYPE_UNOP:
exp1 = DEBUG_EvalExpr(exp->un.unop.exp1);
if( exp1.type == NULL )
{
break;
}
rtn.off = (unsigned int) &exp->un.unop.result;
if( exp1.type == DEBUG_TypeIntConst )
{
rtn.type = exp1.type;
}
else
{
rtn.type = DEBUG_TypeInt;
}
switch(exp->un.unop.unop_type)
{
case EXP_OP_NEG:
rtn.seg = 0;
exp->un.unop.result = -VAL(exp1);
break;
case EXP_OP_NOT:
rtn.seg = 0;
exp->un.unop.result = !VAL(exp1);
break;
case EXP_OP_LNOT:
rtn.seg = 0;
exp->un.unop.result = ~VAL(exp1);
break;
case EXP_OP_DEREF:
rtn.seg = 0;
rtn.off = (unsigned int) DEBUG_TypeDerefPointer(&exp1, &rtn.type);
break;
case EXP_OP_FORCE_DEREF:
rtn.seg = exp1.seg;
rtn.off = *(unsigned int *) exp1.off;
break;
case EXP_OP_ADDR:
rtn.seg = 0;
rtn.type = DEBUG_FindOrMakePointerType(exp1.type);
exp->un.unop.result = exp1.off;
break;
}
break;
default:
fprintf(stderr,"Unexpected expression.\n");
DEBUG_Exit(123);
break;
}
return rtn;
}
int
DEBUG_DisplayExpr(struct expr * exp)
{
int i;
switch(exp->type)
{
case EXPR_TYPE_CAST:
fprintf(stderr, "((");
DEBUG_PrintTypeCast(exp->un.cast.cast);
fprintf(stderr, ")");
DEBUG_DisplayExpr(exp->un.cast.expr);
fprintf(stderr, ")");
break;
case EXPR_TYPE_REGISTER:
DEBUG_PrintRegister(exp->un.rgister.reg);
break;
case EXPR_TYPE_US_CONST:
fprintf(stderr, "%ud", exp->un.u_const.value);
break;
case EXPR_TYPE_CONST:
fprintf(stderr, "%d", exp->un.u_const.value);
break;
case EXPR_TYPE_STRING:
fprintf(stderr, "\"%s\"", exp->un.string.str);
break;
case EXPR_TYPE_SYMBOL:
fprintf(stderr, "%s" , exp->un.symbol.name);
break;
case EXPR_TYPE_PSTRUCT:
DEBUG_DisplayExpr(exp->un.structure.exp1);
fprintf(stderr, "->%s", exp->un.structure.element_name);
break;
case EXPR_TYPE_STRUCT:
DEBUG_DisplayExpr(exp->un.structure.exp1);
fprintf(stderr, ".%s", exp->un.structure.element_name);
break;
case EXPR_TYPE_CALL:
/*
* First, evaluate all of the arguments. If any of them are not
* evaluable, then bail.
*/
fprintf(stderr, "%s(",exp->un.call.funcname);
for(i=0; i < exp->un.call.nargs; i++)
{
DEBUG_DisplayExpr(exp->un.call.arg[i]);
if( i != exp->un.call.nargs - 1 )
{
fprintf(stderr, ", ");
}
}
fprintf(stderr, ")");
break;
case EXPR_TYPE_BINOP:
fprintf(stderr, "( ");
DEBUG_DisplayExpr(exp->un.binop.exp1);
switch(exp->un.binop.binop_type)
{
case EXP_OP_ADD:
fprintf(stderr, " + ");
break;
case EXP_OP_SUB:
fprintf(stderr, " - ");
break;
case EXP_OP_SEG:
fprintf(stderr, ":");
break;
case EXP_OP_LOR:
fprintf(stderr, " || ");
break;
case EXP_OP_LAND:
fprintf(stderr, " && ");
break;
case EXP_OP_OR:
fprintf(stderr, " | ");
break;
case EXP_OP_AND:
fprintf(stderr, " & ");
break;
case EXP_OP_XOR:
fprintf(stderr, " ^ ");
break;
case EXP_OP_EQ:
fprintf(stderr, " == ");
break;
case EXP_OP_GT:
fprintf(stderr, " > ");
break;
case EXP_OP_LT:
fprintf(stderr, " < ");
break;
case EXP_OP_GE:
fprintf(stderr, " >= ");
break;
case EXP_OP_LE:
fprintf(stderr, " <= ");
break;
case EXP_OP_NE:
fprintf(stderr, " != ");
break;
case EXP_OP_SHL:
fprintf(stderr, " << ");
break;
case EXP_OP_SHR:
fprintf(stderr, " >> ");
break;
case EXP_OP_MUL:
fprintf(stderr, " * ");
break;
case EXP_OP_DIV:
fprintf(stderr, " / ");
break;
case EXP_OP_REM:
fprintf(stderr, " %% ");
break;
case EXP_OP_ARR:
fprintf(stderr, "[");
break;
default:
break;
}
DEBUG_DisplayExpr(exp->un.binop.exp2);
if( exp->un.binop.binop_type == EXP_OP_ARR )
{
fprintf(stderr, "]");
}
fprintf(stderr, " )");
break;
case EXPR_TYPE_UNOP:
switch(exp->un.unop.unop_type)
{
case EXP_OP_NEG:
fprintf(stderr, "-");
break;
case EXP_OP_NOT:
fprintf(stderr, "!");
break;
case EXP_OP_LNOT:
fprintf(stderr, "~");
break;
case EXP_OP_DEREF:
fprintf(stderr, "*");
break;
case EXP_OP_ADDR:
fprintf(stderr, "&");
break;
}
DEBUG_DisplayExpr(exp->un.unop.exp1);
break;
default:
fprintf(stderr,"Unexpected expression.\n");
DEBUG_Exit(123);
break;
}
return TRUE;
}
struct expr *
DEBUG_CloneExpr(struct expr * exp)
{
int i;
struct expr * rtn;
rtn = (struct expr *) DBG_alloc(sizeof(struct expr));
/*
* First copy the contents of the expression itself.
*/
*rtn = *exp;
switch(exp->type)
{
case EXPR_TYPE_CAST:
rtn->un.cast.expr = DEBUG_CloneExpr(exp->un.cast.expr);
break;
case EXPR_TYPE_REGISTER:
case EXPR_TYPE_US_CONST:
case EXPR_TYPE_CONST:
break;
case EXPR_TYPE_STRING:
rtn->un.string.str = DBG_strdup(exp->un.string.str);
break;
case EXPR_TYPE_SYMBOL:
rtn->un.symbol.name = DBG_strdup(exp->un.symbol.name);
break;
case EXPR_TYPE_PSTRUCT:
case EXPR_TYPE_STRUCT:
rtn->un.structure.exp1 = DEBUG_CloneExpr(exp->un.structure.exp1);
rtn->un.structure.element_name = DBG_strdup(exp->un.structure.element_name);
break;
case EXPR_TYPE_CALL:
/*
* First, evaluate all of the arguments. If any of them are not
* evaluable, then bail.
*/
for(i=0; i < exp->un.call.nargs; i++)
{
rtn->un.call.arg[i] = DEBUG_CloneExpr(exp->un.call.arg[i]);
}
rtn->un.call.funcname = DBG_strdup(exp->un.call.funcname);
break;
case EXPR_TYPE_BINOP:
rtn->un.binop.exp1 = DEBUG_CloneExpr(exp->un.binop.exp1);
rtn->un.binop.exp2 = DEBUG_CloneExpr(exp->un.binop.exp2);
break;
case EXPR_TYPE_UNOP:
rtn->un.unop.exp1 = DEBUG_CloneExpr(exp->un.unop.exp1);
break;
default:
fprintf(stderr,"Unexpected expression.\n");
DEBUG_Exit(123);
break;
}
return rtn;
}
/*
* Recursively go through an expression tree and free all memory associated
* with it.
*/
int
DEBUG_FreeExpr(struct expr * exp)
{
int i;
switch(exp->type)
{
case EXPR_TYPE_CAST:
DEBUG_FreeExpr(exp->un.cast.expr);
break;
case EXPR_TYPE_REGISTER:
case EXPR_TYPE_US_CONST:
case EXPR_TYPE_CONST:
break;
case EXPR_TYPE_STRING:
DBG_free((char *) exp->un.string.str);
break;
case EXPR_TYPE_SYMBOL:
DBG_free((char *) exp->un.symbol.name);
break;
case EXPR_TYPE_PSTRUCT:
case EXPR_TYPE_STRUCT:
DEBUG_FreeExpr(exp->un.structure.exp1);
DBG_free((char *) exp->un.structure.element_name);
break;
case EXPR_TYPE_CALL:
/*
* First, evaluate all of the arguments. If any of them are not
* evaluable, then bail.
*/
for(i=0; i < exp->un.call.nargs; i++)
{
DEBUG_FreeExpr(exp->un.call.arg[i]);
}
DBG_free((char *) exp->un.call.funcname);
break;
case EXPR_TYPE_BINOP:
DEBUG_FreeExpr(exp->un.binop.exp1);
DEBUG_FreeExpr(exp->un.binop.exp2);
break;
case EXPR_TYPE_UNOP:
DEBUG_FreeExpr(exp->un.unop.exp1);
break;
default:
fprintf(stderr,"Unexpected expression.\n");
DEBUG_Exit(123);
break;
}
DBG_free(exp);
return TRUE;
}
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