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binutils-gdb/gdb/expprint.c

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/* Print in infix form a struct expression.
Copyright (C) 1986, 1989, 1991 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "defs.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "expression.h"
#include "value.h"
#include "language.h"
#include "parser-defs.h"
/* Prototypes for local functions */
static void
print_subexp PARAMS ((struct expression *, int *, FILE *, enum precedence));
static void
print_simple_m2_func PARAMS ((char *, struct expression *, int *, FILE *));
void
print_expression (exp, stream)
struct expression *exp;
FILE *stream;
{
int pc = 0;
print_subexp (exp, &pc, stream, PREC_NULL);
}
/* Print the subexpression of EXP that starts in position POS, on STREAM.
PREC is the precedence of the surrounding operator;
if the precedence of the main operator of this subexpression is less,
parentheses are needed here. */
static void
print_subexp (exp, pos, stream, prec)
register struct expression *exp;
register int *pos;
FILE *stream;
enum precedence prec;
{
register unsigned tem;
register const struct op_print *op_print_tab;
register int pc;
unsigned nargs;
register char *op_str;
int assign_modify = 0;
enum exp_opcode opcode;
enum precedence myprec;
/* Set to 1 for a right-associative operator. */
int assoc;
value val;
char *tempstr;
op_print_tab = exp->language_defn->la_op_print_tab;
pc = (*pos)++;
opcode = exp->elts[pc].opcode;
switch (opcode)
{
/* Common ops */
case OP_SCOPE:
myprec = PREC_PREFIX;
assoc = 0;
fputs_filtered (type_name_no_tag (exp->elts[pc + 1].type), stream);
fputs_filtered ("::", stream);
nargs = longest_to_int (exp->elts[pc + 2].longconst);
(*pos) += 4 + BYTES_TO_EXP_ELEM (nargs + 1);
fputs_filtered (&exp->elts[pc + 3].string, stream);
return;
case OP_LONG:
(*pos) += 3;
value_print (value_from_longest (exp->elts[pc + 1].type,
exp->elts[pc + 2].longconst),
stream, 0, Val_no_prettyprint);
return;
case OP_DOUBLE:
(*pos) += 3;
value_print (value_from_double (exp->elts[pc + 1].type,
exp->elts[pc + 2].doubleconst),
stream, 0, Val_no_prettyprint);
return;
case OP_VAR_VALUE:
(*pos) += 2;
fputs_filtered (SYMBOL_SOURCE_NAME (exp->elts[pc + 1].symbol), stream);
return;
case OP_LAST:
(*pos) += 2;
fprintf_filtered (stream, "$%d",
longest_to_int (exp->elts[pc + 1].longconst));
return;
case OP_REGISTER:
(*pos) += 2;
fprintf_filtered (stream, "$%s",
reg_names[longest_to_int (exp->elts[pc + 1].longconst)]);
return;
case OP_BOOL:
(*pos) += 2;
fprintf_filtered (stream, "%s",
longest_to_int (exp->elts[pc + 1].longconst)
? "TRUE" : "FALSE");
return;
case OP_INTERNALVAR:
(*pos) += 2;
fprintf_filtered (stream, "$%s",
internalvar_name (exp->elts[pc + 1].internalvar));
return;
case OP_FUNCALL:
(*pos) += 2;
nargs = longest_to_int (exp->elts[pc + 1].longconst);
print_subexp (exp, pos, stream, PREC_SUFFIX);
fputs_filtered (" (", stream);
for (tem = 0; tem < nargs; tem++)
{
if (tem != 0)
fputs_filtered (", ", stream);
print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
}
fputs_filtered (")", stream);
return;
case OP_STRING:
nargs = longest_to_int (exp -> elts[pc + 1].longconst);
(*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
/* LA_PRINT_STRING will print using the current repeat count threshold.
If necessary, we can temporarily set it to zero, or pass it as an
additional parameter to LA_PRINT_STRING. -fnf */
LA_PRINT_STRING (stream, &exp->elts[pc + 2].string, nargs, 0);
return;
case OP_BITSTRING:
error ("support for OP_BITSTRING unimplemented");
break;
case OP_ARRAY:
(*pos) += 3;
nargs = longest_to_int (exp->elts[pc + 2].longconst);
nargs -= longest_to_int (exp->elts[pc + 1].longconst);
nargs++;
tem = 0;
if (exp->elts[pc + 4].opcode == OP_LONG
&& exp->elts[pc + 5].type == builtin_type_char
&& exp->language_defn->la_language == language_c)
{
/* Attempt to print C character arrays using string syntax.
Walk through the args, picking up one character from each
of the OP_LONG expression elements. If any array element
does not match our expection of what we should find for
a simple string, revert back to array printing. Note that
the last expression element is an explicit null terminator
byte, which doesn't get printed. */
tempstr = alloca (nargs);
pc += 4;
while (tem < nargs)
{
if (exp->elts[pc].opcode != OP_LONG
|| exp->elts[pc + 1].type != builtin_type_char)
{
/* Not a simple array of char, use regular array printing. */
tem = 0;
break;
}
else
{
tempstr[tem++] =
longest_to_int (exp->elts[pc + 2].longconst);
pc += 4;
}
}
}
if (tem > 0)
{
LA_PRINT_STRING (stream, tempstr, nargs - 1, 0);
(*pos) = pc;
}
else
{
fputs_filtered (" {", stream);
for (tem = 0; tem < nargs; tem++)
{
if (tem != 0)
{
fputs_filtered (", ", stream);
}
print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
}
fputs_filtered ("}", stream);
}
return;
case TERNOP_COND:
if ((int) prec > (int) PREC_COMMA)
fputs_filtered ("(", stream);
/* Print the subexpressions, forcing parentheses
around any binary operations within them.
This is more parentheses than are strictly necessary,
but it looks clearer. */
print_subexp (exp, pos, stream, PREC_HYPER);
fputs_filtered (" ? ", stream);
print_subexp (exp, pos, stream, PREC_HYPER);
fputs_filtered (" : ", stream);
print_subexp (exp, pos, stream, PREC_HYPER);
if ((int) prec > (int) PREC_COMMA)
fputs_filtered (")", stream);
return;
case STRUCTOP_STRUCT:
tem = longest_to_int (exp->elts[pc + 1].longconst);
(*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
print_subexp (exp, pos, stream, PREC_SUFFIX);
fputs_filtered (".", stream);
fputs_filtered (&exp->elts[pc + 2].string, stream);
return;
/* Will not occur for Modula-2 */
case STRUCTOP_PTR:
tem = longest_to_int (exp->elts[pc + 1].longconst);
(*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
print_subexp (exp, pos, stream, PREC_SUFFIX);
fputs_filtered ("->", stream);
fputs_filtered (&exp->elts[pc + 2].string, stream);
return;
case BINOP_SUBSCRIPT:
print_subexp (exp, pos, stream, PREC_SUFFIX);
fputs_filtered ("[", stream);
print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
fputs_filtered ("]", stream);
return;
case UNOP_POSTINCREMENT:
print_subexp (exp, pos, stream, PREC_SUFFIX);
fputs_filtered ("++", stream);
return;
case UNOP_POSTDECREMENT:
print_subexp (exp, pos, stream, PREC_SUFFIX);
fputs_filtered ("--", stream);
return;
case UNOP_CAST:
(*pos) += 2;
if ((int) prec > (int) PREC_PREFIX)
fputs_filtered ("(", stream);
fputs_filtered ("(", stream);
type_print (exp->elts[pc + 1].type, "", stream, 0);
fputs_filtered (") ", stream);
print_subexp (exp, pos, stream, PREC_PREFIX);
if ((int) prec > (int) PREC_PREFIX)
fputs_filtered (")", stream);
return;
case UNOP_MEMVAL:
(*pos) += 2;
if ((int) prec > (int) PREC_PREFIX)
fputs_filtered ("(", stream);
if (exp->elts[pc + 1].type->code == TYPE_CODE_FUNC &&
exp->elts[pc + 3].opcode == OP_LONG) {
/* We have a minimal symbol fn, probably. It's encoded
as a UNOP_MEMVAL (function-type) of an OP_LONG (int, address).
Swallow the OP_LONG (including both its opcodes); ignore
its type; print the value in the type of the MEMVAL. */
(*pos) += 4;
val = value_at_lazy (exp->elts[pc + 1].type,
(CORE_ADDR) exp->elts[pc + 5].longconst);
value_print (val, stream, 0, Val_no_prettyprint);
} else {
fputs_filtered ("{", stream);
type_print (exp->elts[pc + 1].type, "", stream, 0);
fputs_filtered ("} ", stream);
print_subexp (exp, pos, stream, PREC_PREFIX);
}
if ((int) prec > (int) PREC_PREFIX)
fputs_filtered (")", stream);
return;
case BINOP_ASSIGN_MODIFY:
opcode = exp->elts[pc + 1].opcode;
(*pos) += 2;
myprec = PREC_ASSIGN;
assoc = 1;
assign_modify = 1;
op_str = "???";
for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
if (op_print_tab[tem].opcode == opcode)
{
op_str = op_print_tab[tem].string;
break;
}
if (op_print_tab[tem].opcode != opcode)
/* Not found; don't try to keep going because we don't know how
to interpret further elements. */
error ("Invalid expression");
break;
/* C++ ops */
case OP_THIS:
++(*pos);
fputs_filtered ("this", stream);
return;
/* Modula-2 ops */
case MULTI_SUBSCRIPT:
(*pos) += 2;
nargs = longest_to_int (exp->elts[pc + 1].longconst);
print_subexp (exp, pos, stream, PREC_SUFFIX);
fprintf (stream, " [");
for (tem = 0; tem < nargs; tem++)
{
if (tem != 0)
fprintf (stream, ", ");
print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
}
fprintf (stream, "]");
return;
case BINOP_VAL:
(*pos)+=2;
fprintf(stream,"VAL(");
type_print(exp->elts[pc+1].type,"",stream,0);
fprintf(stream,",");
print_subexp(exp,pos,stream,PREC_PREFIX);
fprintf(stream,")");
return;
case UNOP_CAP:
print_simple_m2_func("CAP",exp,pos,stream);
return;
case UNOP_CHR:
print_simple_m2_func("CHR",exp,pos,stream);
return;
case UNOP_ORD:
print_simple_m2_func("ORD",exp,pos,stream);
return;
case UNOP_ABS:
print_simple_m2_func("ABS",exp,pos,stream);
return;
case UNOP_FLOAT:
print_simple_m2_func("FLOAT",exp,pos,stream);
return;
case UNOP_HIGH:
print_simple_m2_func("HIGH",exp,pos,stream);
return;
case UNOP_MAX:
print_simple_m2_func("MAX",exp,pos,stream);
return;
case UNOP_MIN:
print_simple_m2_func("MIN",exp,pos,stream);
return;
case UNOP_ODD:
print_simple_m2_func("ODD",exp,pos,stream);
return;
case UNOP_TRUNC:
print_simple_m2_func("TRUNC",exp,pos,stream);
return;
case BINOP_INCL:
case BINOP_EXCL:
error("print_subexp: Not implemented.");
/* Default ops */
default:
op_str = "???";
for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
if (op_print_tab[tem].opcode == opcode)
{
op_str = op_print_tab[tem].string;
myprec = op_print_tab[tem].precedence;
assoc = op_print_tab[tem].right_assoc;
break;
}
if (op_print_tab[tem].opcode != opcode)
/* Not found; don't try to keep going because we don't know how
to interpret further elements. For example, this happens
if opcode is OP_TYPE. */
error ("Invalid expression");
}
if ((int) myprec < (int) prec)
fputs_filtered ("(", stream);
if ((int) opcode > (int) BINOP_END)
{
/* Unary prefix operator. */
fputs_filtered (op_str, stream);
print_subexp (exp, pos, stream, PREC_PREFIX);
}
else
{
/* Binary operator. */
/* Print left operand.
If operator is right-associative,
increment precedence for this operand. */
print_subexp (exp, pos, stream,
(enum precedence) ((int) myprec + assoc));
/* Print the operator itself. */
if (assign_modify)
fprintf_filtered (stream, " %s= ", op_str);
else if (op_str[0] == ',')
fprintf_filtered (stream, "%s ", op_str);
else
fprintf_filtered (stream, " %s ", op_str);
/* Print right operand.
If operator is left-associative,
increment precedence for this operand. */
print_subexp (exp, pos, stream,
(enum precedence) ((int) myprec + !assoc));
}
if ((int) myprec < (int) prec)
fputs_filtered (")", stream);
}
/* Print out something of the form <s>(<arg>).
This is used to print out some builtin Modula-2
functions.
FIXME: There is probably some way to get the precedence
rules to do this (print a unary operand with parens around it). */
static void
print_simple_m2_func(s,exp,pos,stream)
char *s;
register struct expression *exp;
register int *pos;
FILE *stream;
{
fprintf(stream,"%s(",s);
print_subexp(exp,pos,stream,PREC_PREFIX);
fprintf(stream,")");
}
/* Return the operator corresponding to opcode OP as
a string. NULL indicates that the opcode was not found in the
current language table. */
char *
op_string(op)
enum exp_opcode op;
{
int tem;
register const struct op_print *op_print_tab;
op_print_tab = current_language->la_op_print_tab;
for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
if (op_print_tab[tem].opcode == op)
return op_print_tab[tem].string;
return NULL;
}
#ifdef DEBUG_EXPRESSIONS
/* Support for dumping the raw data from expressions in a human readable
form. */
void
dump_expression (exp, stream, note)
struct expression *exp;
FILE *stream;
char *note;
{
int elt;
char *opcode_name;
char *eltscan;
int eltsize;
fprintf_filtered (stream, "Dump of expression @ 0x%x, %s:\n", exp, note);
fprintf_filtered (stream, "\tLanguage %s, %d elements, %d bytes each.\n",
exp->language_defn->la_name, exp -> nelts,
sizeof (union exp_element));
fprintf_filtered (stream, "\t%5s %20s %16s %s\n", "Index", "Opcode",
"Hex Value", "String Value");
for (elt = 0; elt < exp -> nelts; elt++)
{
fprintf_filtered (stream, "\t%5d ", elt);
switch (exp -> elts[elt].opcode)
{
default: opcode_name = "<unknown>"; break;
case OP_NULL: opcode_name = "OP_NULL"; break;
case BINOP_ADD: opcode_name = "BINOP_ADD"; break;
case BINOP_SUB: opcode_name = "BINOP_SUB"; break;
case BINOP_MUL: opcode_name = "BINOP_MUL"; break;
case BINOP_DIV: opcode_name = "BINOP_DIV"; break;
case BINOP_REM: opcode_name = "BINOP_REM"; break;
case BINOP_MOD: opcode_name = "BINOP_MOD"; break;
case BINOP_LSH: opcode_name = "BINOP_LSH"; break;
case BINOP_RSH: opcode_name = "BINOP_RSH"; break;
case BINOP_LOGICAL_AND: opcode_name = "BINOP_LOGICAL_AND"; break;
case BINOP_LOGICAL_OR: opcode_name = "BINOP_LOGICAL_OR"; break;
case BINOP_BITWISE_AND: opcode_name = "BINOP_BITWISE_AND"; break;
case BINOP_BITWISE_IOR: opcode_name = "BINOP_BITWISE_IOR"; break;
case BINOP_BITWISE_XOR: opcode_name = "BINOP_BITWISE_XOR"; break;
case BINOP_EQUAL: opcode_name = "BINOP_EQUAL"; break;
case BINOP_NOTEQUAL: opcode_name = "BINOP_NOTEQUAL"; break;
case BINOP_LESS: opcode_name = "BINOP_LESS"; break;
case BINOP_GTR: opcode_name = "BINOP_GTR"; break;
case BINOP_LEQ: opcode_name = "BINOP_LEQ"; break;
case BINOP_GEQ: opcode_name = "BINOP_GEQ"; break;
case BINOP_REPEAT: opcode_name = "BINOP_REPEAT"; break;
case BINOP_ASSIGN: opcode_name = "BINOP_ASSIGN"; break;
case BINOP_COMMA: opcode_name = "BINOP_COMMA"; break;
case BINOP_SUBSCRIPT: opcode_name = "BINOP_SUBSCRIPT"; break;
case MULTI_SUBSCRIPT: opcode_name = "MULTI_SUBSCRIPT"; break;
case BINOP_EXP: opcode_name = "BINOP_EXP"; break;
case BINOP_MIN: opcode_name = "BINOP_MIN"; break;
case BINOP_MAX: opcode_name = "BINOP_MAX"; break;
case BINOP_SCOPE: opcode_name = "BINOP_SCOPE"; break;
case STRUCTOP_MEMBER: opcode_name = "STRUCTOP_MEMBER"; break;
case STRUCTOP_MPTR: opcode_name = "STRUCTOP_MPTR"; break;
case BINOP_INTDIV: opcode_name = "BINOP_INTDIV"; break;
case BINOP_ASSIGN_MODIFY: opcode_name = "BINOP_ASSIGN_MODIFY"; break;
case BINOP_VAL: opcode_name = "BINOP_VAL"; break;
case BINOP_INCL: opcode_name = "BINOP_INCL"; break;
case BINOP_EXCL: opcode_name = "BINOP_EXCL"; break;
case BINOP_CONCAT: opcode_name = "BINOP_CONCAT"; break;
case BINOP_END: opcode_name = "BINOP_END"; break;
case TERNOP_COND: opcode_name = "TERNOP_COND"; break;
case OP_LONG: opcode_name = "OP_LONG"; break;
case OP_DOUBLE: opcode_name = "OP_DOUBLE"; break;
case OP_VAR_VALUE: opcode_name = "OP_VAR_VALUE"; break;
case OP_LAST: opcode_name = "OP_LAST"; break;
case OP_REGISTER: opcode_name = "OP_REGISTER"; break;
case OP_INTERNALVAR: opcode_name = "OP_INTERNALVAR"; break;
case OP_FUNCALL: opcode_name = "OP_FUNCALL"; break;
case OP_STRING: opcode_name = "OP_STRING"; break;
case OP_BITSTRING: opcode_name = "OP_BITSTRING"; break;
case OP_ARRAY: opcode_name = "OP_ARRAY"; break;
case UNOP_CAST: opcode_name = "UNOP_CAST"; break;
case UNOP_MEMVAL: opcode_name = "UNOP_MEMVAL"; break;
case UNOP_NEG: opcode_name = "UNOP_NEG"; break;
case UNOP_LOGICAL_NOT: opcode_name = "UNOP_LOGICAL_NOT"; break;
case UNOP_COMPLEMENT: opcode_name = "UNOP_COMPLEMENT"; break;
case UNOP_IND: opcode_name = "UNOP_IND"; break;
case UNOP_ADDR: opcode_name = "UNOP_ADDR"; break;
case UNOP_PREINCREMENT: opcode_name = "UNOP_PREINCREMENT"; break;
case UNOP_POSTINCREMENT: opcode_name = "UNOP_POSTINCREMENT"; break;
case UNOP_PREDECREMENT: opcode_name = "UNOP_PREDECREMENT"; break;
case UNOP_POSTDECREMENT: opcode_name = "UNOP_POSTDECREMENT"; break;
case UNOP_SIZEOF: opcode_name = "UNOP_SIZEOF"; break;
case UNOP_PLUS: opcode_name = "UNOP_PLUS"; break;
case UNOP_CAP: opcode_name = "UNOP_CAP"; break;
case UNOP_CHR: opcode_name = "UNOP_CHR"; break;
case UNOP_ORD: opcode_name = "UNOP_ORD"; break;
case UNOP_ABS: opcode_name = "UNOP_ABS"; break;
case UNOP_FLOAT: opcode_name = "UNOP_FLOAT"; break;
case UNOP_HIGH: opcode_name = "UNOP_HIGH"; break;
case UNOP_MAX: opcode_name = "UNOP_MAX"; break;
case UNOP_MIN: opcode_name = "UNOP_MIN"; break;
case UNOP_ODD: opcode_name = "UNOP_ODD"; break;
case UNOP_TRUNC: opcode_name = "UNOP_TRUNC"; break;
case OP_BOOL: opcode_name = "OP_BOOL"; break;
case OP_M2_STRING: opcode_name = "OP_M2_STRING"; break;
case STRUCTOP_STRUCT: opcode_name = "STRUCTOP_STRUCT"; break;
case STRUCTOP_PTR: opcode_name = "STRUCTOP_PTR"; break;
case OP_THIS: opcode_name = "OP_THIS"; break;
case OP_SCOPE: opcode_name = "OP_SCOPE"; break;
case OP_TYPE: opcode_name = "OP_TYPE"; break;
}
fprintf_filtered (stream, "%20s ", opcode_name);
fprintf_filtered (stream,
#if defined (LONG_LONG)
"%ll16x ",
#else
"%l16x ",
#endif
exp -> elts[elt].longconst);
for (eltscan = (char *) &exp->elts[elt],
eltsize = sizeof (union exp_element) ;
eltsize-- > 0;
eltscan++)
{
fprintf_filtered (stream, "%c",
isprint (*eltscan) ? (*eltscan & 0xFF) : '.');
}
fprintf_filtered (stream, "\n");
}
}
#endif /* DEBUG_EXPRESSIONS */
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