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Sweden-Number/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 <string.h>
#include "winbase.h"
#include "wine/winbase16.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
{
const char * name;
} intvar;
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_INTVAR 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 unsigned 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(void)
{
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(void)
{
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_IntVarExpr(const char* name)
{
struct expr * ex;
ex = DEBUG_GetFreeExpr();
ex->type = EXPR_TYPE_INTVAR;
ex->un.intvar.name = name;
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_VALUE DEBUG_EvalExpr(struct expr * exp)
{
DBG_VALUE rtn;
int i;
DBG_VALUE exp1;
DBG_VALUE exp2;
unsigned int cexp[5];
int scale1;
int scale2;
int scale3;
struct datatype * type1;
struct datatype * type2;
rtn.type = NULL;
rtn.cookie = DV_INVALID;
rtn.addr.off = 0;
rtn.addr.seg = 0;
switch(exp->type)
{
case EXPR_TYPE_CAST:
rtn = DEBUG_EvalExpr(exp->un.cast.expr);
rtn.type = exp->un.cast.cast;
if (DEBUG_GetType(rtn.type) == DT_POINTER)
rtn.cookie = DV_TARGET;
break;
case EXPR_TYPE_STRING:
rtn.type = DEBUG_GetBasicType(DT_BASIC_STRING);
rtn.cookie = DV_HOST;
rtn.addr.off = (unsigned int) &exp->un.string.str;
rtn.addr.seg = 0;
break;
case EXPR_TYPE_CONST:
rtn.type = DEBUG_GetBasicType(DT_BASIC_CONST_INT);
rtn.cookie = DV_HOST;
rtn.addr.off = (unsigned int) &exp->un.constant.value;
rtn.addr.seg = 0;
break;
case EXPR_TYPE_US_CONST:
rtn.type = DEBUG_GetBasicType(DT_BASIC_USHORTINT);
rtn.cookie = DV_HOST;
rtn.addr.off = (unsigned int) &exp->un.u_const.value;
rtn.addr.seg = 0;
break;
case EXPR_TYPE_SYMBOL:
if( !DEBUG_GetSymbolValue(exp->un.symbol.name, -1, &rtn, FALSE) )
{
DEBUG_Printf(DBG_CHN_MESG, "%s\n", exp->un.symbol.name);
RaiseException(DEBUG_STATUS_NO_SYMBOL, 0, 0, NULL);
}
break;
case EXPR_TYPE_PSTRUCT:
exp1 = DEBUG_EvalExpr(exp->un.structure.exp1);
if( exp1.type == NULL )
{
RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
}
rtn.cookie = DV_TARGET;
rtn.addr.off = DEBUG_TypeDerefPointer(&exp1, &rtn.type);
if( rtn.type == NULL )
{
RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
}
if (!DEBUG_FindStructElement(&rtn, exp->un.structure.element_name,
&exp->un.structure.result))
{
DEBUG_Printf(DBG_CHN_MESG, "%s\n", exp->un.structure.element_name);
RaiseException(DEBUG_STATUS_NO_FIELD, 0, 0, NULL);
}
break;
case EXPR_TYPE_STRUCT:
exp1 = DEBUG_EvalExpr(exp->un.structure.exp1);
if( exp1.type == NULL )
{
RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
}
rtn = exp1;
if (!DEBUG_FindStructElement(&rtn, exp->un.structure.element_name,
&exp->un.structure.result))
{
DEBUG_Printf(DBG_CHN_MESG, "%s\n", exp->un.structure.element_name);
RaiseException(DEBUG_STATUS_NO_FIELD, 0, 0, NULL);
}
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 ) )
{
RaiseException(DEBUG_STATUS_NO_SYMBOL, 0, 0, NULL);
}
#if 0
/* FIXME: NEWDBG NIY */
/* Anyway, I wonder how this could work depending on the calling order of
* the function (cdecl vs pascal for example)
*/
int (*fptr)();
fptr = (int (*)()) rtn.addr.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;
}
#else
DEBUG_Printf(DBG_CHN_MESG, "Function call no longer implemented\n");
/* would need to set up a call to this function, and then restore the current
* context afterwards...
*/
exp->un.call.result = 0;
#endif
rtn.type = DEBUG_GetBasicType(DT_BASIC_INT);
rtn.cookie = DV_HOST;
rtn.addr.off = (unsigned int) &exp->un.call.result;
break;
case EXPR_TYPE_INTVAR:
{
DBG_INTVAR* div = DEBUG_GetIntVar(exp->un.intvar.name);
if (!div) RaiseException(DEBUG_STATUS_NO_SYMBOL, 0, 0, NULL);
rtn.cookie = DV_HOST;
rtn.type = div->type;
rtn.addr.off = (unsigned int)div->pval;
/* EPP FIXME rtn.addr.seg = ?? */
}
break;
case EXPR_TYPE_BINOP:
exp1 = DEBUG_EvalExpr(exp->un.binop.exp1);
exp2 = DEBUG_EvalExpr(exp->un.binop.exp2);
rtn.cookie = DV_HOST;
if( exp1.type == NULL || exp2.type == NULL )
{
RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
}
if( exp1.type == DEBUG_GetBasicType(DT_BASIC_CONST_INT) &&
exp2.type == DEBUG_GetBasicType(DT_BASIC_CONST_INT) )
{
rtn.type = exp1.type;
}
else
{
rtn.type = DEBUG_GetBasicType(DT_BASIC_INT);
}
rtn.addr.seg = 0;
rtn.addr.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 )
{
RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
}
else if( type1 != NULL )
{
scale2 = DEBUG_GetObjectSize(type1);
rtn.type = exp1.type;
}
else if( type2 != NULL )
{
scale1 = DEBUG_GetObjectSize(type2);
rtn.type = exp2.type;
}
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 )
{
RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
}
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;
}
exp->un.binop.result = (VAL(exp1) - VAL(exp2)) / scale3;
break;
case EXP_OP_SEG:
rtn.cookie = DV_TARGET;
rtn.type = NULL;
rtn.addr.seg = VAL(exp1);
rtn.addr.off = VAL(exp2);
break;
case EXP_OP_LOR:
exp->un.binop.result = (VAL(exp1) || VAL(exp2));
break;
case EXP_OP_LAND:
exp->un.binop.result = (VAL(exp1) && VAL(exp2));
break;
case EXP_OP_OR:
exp->un.binop.result = (VAL(exp1) | VAL(exp2));
break;
case EXP_OP_AND:
exp->un.binop.result = (VAL(exp1) & VAL(exp2));
break;
case EXP_OP_XOR:
exp->un.binop.result = (VAL(exp1) ^ VAL(exp2));
break;
case EXP_OP_EQ:
exp->un.binop.result = (VAL(exp1) == VAL(exp2));
break;
case EXP_OP_GT:
exp->un.binop.result = (VAL(exp1) > VAL(exp2));
break;
case EXP_OP_LT:
exp->un.binop.result = (VAL(exp1) < VAL(exp2));
break;
case EXP_OP_GE:
exp->un.binop.result = (VAL(exp1) >= VAL(exp2));
break;
case EXP_OP_LE:
exp->un.binop.result = (VAL(exp1) <= VAL(exp2));
break;
case EXP_OP_NE:
exp->un.binop.result = (VAL(exp1) != VAL(exp2));
break;
case EXP_OP_SHL:
exp->un.binop.result = ((unsigned) VAL(exp1) << VAL(exp2));
break;
case EXP_OP_SHR:
exp->un.binop.result = ((unsigned) VAL(exp1) >> VAL(exp2));
break;
case EXP_OP_MUL:
exp->un.binop.result = (VAL(exp1) * VAL(exp2));
break;
case EXP_OP_DIV:
if( VAL(exp2) == 0 )
{
RaiseException(DEBUG_STATUS_DIV_BY_ZERO, 0, 0, NULL);
}
exp->un.binop.result = (VAL(exp1) / VAL(exp2));
break;
case EXP_OP_REM:
if( VAL(exp2) == 0 )
{
RaiseException(DEBUG_STATUS_DIV_BY_ZERO, 0, 0, NULL);
}
exp->un.binop.result = (VAL(exp1) % VAL(exp2));
break;
case EXP_OP_ARR:
DEBUG_ArrayIndex(&exp1, &rtn, VAL(exp2));
break;
default:
RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
break;
}
break;
case EXPR_TYPE_UNOP:
exp1 = DEBUG_EvalExpr(exp->un.unop.exp1);
rtn.cookie = DV_HOST;
if( exp1.type == NULL )
{
RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
}
rtn.addr.seg = 0;
rtn.addr.off = (unsigned int) &exp->un.unop.result;
if( exp1.type == DEBUG_GetBasicType(DT_BASIC_CONST_INT) )
{
rtn.type = exp1.type;
}
else
{
rtn.type = DEBUG_GetBasicType(DT_BASIC_INT);
}
switch(exp->un.unop.unop_type)
{
case EXP_OP_NEG:
exp->un.unop.result = -VAL(exp1);
break;
case EXP_OP_NOT:
exp->un.unop.result = !VAL(exp1);
break;
case EXP_OP_LNOT:
exp->un.unop.result = ~VAL(exp1);
break;
case EXP_OP_DEREF:
/* FIXME: this is currently buggy.
* there is no way to tell were the deref:ed value is...
* for example:
* x is a pointer to struct s, x being on the stack
* => exp1 is target, result is target
* x is a pointer to struct s, x being optimized into a reg
* => exp1 is host, result is target
* x is a pointer to internal variable x
* => exp1 is host, result is host
* so we force DV_TARGET, because dereferencing pointers to
* internal variables is very unlikely. a correct fix would be
* rather large.
*/
rtn.cookie = DV_TARGET;
rtn.addr.off = (unsigned int) DEBUG_TypeDerefPointer(&exp1, &rtn.type);
if (!rtn.type)
{
RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
}
break;
case EXP_OP_FORCE_DEREF:
rtn.cookie = exp1.cookie;
rtn.addr.seg = exp1.addr.seg;
if (exp1.cookie == DV_TARGET)
DEBUG_READ_MEM((void*)exp1.addr.off, &rtn.addr.off, sizeof(rtn.addr.off));
else
memcpy(&rtn.addr.off, (void*)exp1.addr.off, sizeof(rtn.addr.off));
break;
case EXP_OP_ADDR:
/* FIXME: even for a 16 bit entity ? */
rtn.type = DEBUG_FindOrMakePointerType(exp1.type);
exp->un.unop.result = exp1.addr.off;
break;
default:
RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
}
break;
default:
DEBUG_Printf(DBG_CHN_MESG,"Unexpected expression (%d).\n", exp->type);
RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
break;
}
assert(rtn.cookie == DV_TARGET || rtn.cookie == DV_HOST);
return rtn;
}
int
DEBUG_DisplayExpr(const struct expr * exp)
{
int i;
switch(exp->type)
{
case EXPR_TYPE_CAST:
DEBUG_Printf(DBG_CHN_MESG, "((");
DEBUG_PrintTypeCast(exp->un.cast.cast);
DEBUG_Printf(DBG_CHN_MESG, ")");
DEBUG_DisplayExpr(exp->un.cast.expr);
DEBUG_Printf(DBG_CHN_MESG, ")");
break;
case EXPR_TYPE_INTVAR:
DEBUG_Printf(DBG_CHN_MESG, "$%s", exp->un.intvar.name);
break;
case EXPR_TYPE_US_CONST:
DEBUG_Printf(DBG_CHN_MESG, "%ud", exp->un.u_const.value);
break;
case EXPR_TYPE_CONST:
DEBUG_Printf(DBG_CHN_MESG, "%d", exp->un.u_const.value);
break;
case EXPR_TYPE_STRING:
DEBUG_Printf(DBG_CHN_MESG, "\"%s\"", exp->un.string.str);
break;
case EXPR_TYPE_SYMBOL:
DEBUG_Printf(DBG_CHN_MESG, "%s" , exp->un.symbol.name);
break;
case EXPR_TYPE_PSTRUCT:
DEBUG_DisplayExpr(exp->un.structure.exp1);
DEBUG_Printf(DBG_CHN_MESG, "->%s", exp->un.structure.element_name);
break;
case EXPR_TYPE_STRUCT:
DEBUG_DisplayExpr(exp->un.structure.exp1);
DEBUG_Printf(DBG_CHN_MESG, ".%s", exp->un.structure.element_name);
break;
case EXPR_TYPE_CALL:
DEBUG_Printf(DBG_CHN_MESG, "%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 )
{
DEBUG_Printf(DBG_CHN_MESG, ", ");
}
}
DEBUG_Printf(DBG_CHN_MESG, ")");
break;
case EXPR_TYPE_BINOP:
DEBUG_Printf(DBG_CHN_MESG, "( ");
DEBUG_DisplayExpr(exp->un.binop.exp1);
switch(exp->un.binop.binop_type)
{
case EXP_OP_ADD:
DEBUG_Printf(DBG_CHN_MESG, " + ");
break;
case EXP_OP_SUB:
DEBUG_Printf(DBG_CHN_MESG, " - ");
break;
case EXP_OP_SEG:
DEBUG_Printf(DBG_CHN_MESG, ":");
break;
case EXP_OP_LOR:
DEBUG_Printf(DBG_CHN_MESG, " || ");
break;
case EXP_OP_LAND:
DEBUG_Printf(DBG_CHN_MESG, " && ");
break;
case EXP_OP_OR:
DEBUG_Printf(DBG_CHN_MESG, " | ");
break;
case EXP_OP_AND:
DEBUG_Printf(DBG_CHN_MESG, " & ");
break;
case EXP_OP_XOR:
DEBUG_Printf(DBG_CHN_MESG, " ^ ");
break;
case EXP_OP_EQ:
DEBUG_Printf(DBG_CHN_MESG, " == ");
break;
case EXP_OP_GT:
DEBUG_Printf(DBG_CHN_MESG, " > ");
break;
case EXP_OP_LT:
DEBUG_Printf(DBG_CHN_MESG, " < ");
break;
case EXP_OP_GE:
DEBUG_Printf(DBG_CHN_MESG, " >= ");
break;
case EXP_OP_LE:
DEBUG_Printf(DBG_CHN_MESG, " <= ");
break;
case EXP_OP_NE:
DEBUG_Printf(DBG_CHN_MESG, " != ");
break;
case EXP_OP_SHL:
DEBUG_Printf(DBG_CHN_MESG, " << ");
break;
case EXP_OP_SHR:
DEBUG_Printf(DBG_CHN_MESG, " >> ");
break;
case EXP_OP_MUL:
DEBUG_Printf(DBG_CHN_MESG, " * ");
break;
case EXP_OP_DIV:
DEBUG_Printf(DBG_CHN_MESG, " / ");
break;
case EXP_OP_REM:
DEBUG_Printf(DBG_CHN_MESG, " %% ");
break;
case EXP_OP_ARR:
DEBUG_Printf(DBG_CHN_MESG, "[");
break;
default:
break;
}
DEBUG_DisplayExpr(exp->un.binop.exp2);
if( exp->un.binop.binop_type == EXP_OP_ARR )
{
DEBUG_Printf(DBG_CHN_MESG, "]");
}
DEBUG_Printf(DBG_CHN_MESG, " )");
break;
case EXPR_TYPE_UNOP:
switch(exp->un.unop.unop_type)
{
case EXP_OP_NEG:
DEBUG_Printf(DBG_CHN_MESG, "-");
break;
case EXP_OP_NOT:
DEBUG_Printf(DBG_CHN_MESG, "!");
break;
case EXP_OP_LNOT:
DEBUG_Printf(DBG_CHN_MESG, "~");
break;
case EXP_OP_DEREF:
DEBUG_Printf(DBG_CHN_MESG, "*");
break;
case EXP_OP_ADDR:
DEBUG_Printf(DBG_CHN_MESG, "&");
break;
}
DEBUG_DisplayExpr(exp->un.unop.exp1);
break;
default:
DEBUG_Printf(DBG_CHN_MESG,"Unexpected expression.\n");
RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
break;
}
return TRUE;
}
struct expr *
DEBUG_CloneExpr(const 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_INTVAR:
rtn->un.intvar.name = DBG_strdup(exp->un.intvar.name);
break;
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:
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:
DEBUG_Printf(DBG_CHN_MESG,"Unexpected expression.\n");
RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
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_INTVAR:
DBG_free((char *) exp->un.intvar.name);
break;
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:
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:
DEBUG_Printf(DBG_CHN_MESG,"Unexpected expression.\n");
RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
break;
}
DBG_free(exp);
return TRUE;
}
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