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(pop): Returning the right element does help...

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(pick): Likewise.
(dwarf_eval_expr): Fix "while" conditional so we see all operators.
	Fix DW_OP_litN typo: "opcode = DW_OP_lit0" to
	"opcode - DW_OP_lit0".
	Add lots of Debug() statements so we can see what's going
	on.  Debug level 15 will show just entry/return values.
	Debug level 16 shows all operators.

(Logical change 1.290)
This commit is contained in:
homeip.net!davidm 2005-05-03 09:13:17 +00:00
parent 7aade965b4
commit 670399d357
1 changed files with 54 additions and 6 deletions
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60
src/dwarf/Gexpr.c
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@ -161,7 +161,7 @@ read_operand (unw_addr_space_t as, unw_accessors_t *a,
case OFFSET: /* only used by DW_OP_call_ref, which we don't implement */
default:
Debug (1, "Unexpected operand type %d", operand_type);
Debug (1, "Unexpected operand type %d\n", operand_type);
ret = -UNW_EINVAL;
}
return ret;
@ -184,12 +184,12 @@ dwarf_eval_expr (struct dwarf_cursor *c, unw_word_t *addr, unw_word_t len,
int ret;
# define pop() \
({ \
if (tos >= MAX_EXPR_STACK_SIZE) \
if ((tos - 1) >= MAX_EXPR_STACK_SIZE) \
{ \
Debug (1, "Stack underflow\n"); \
return -UNW_EINVAL; \
} \
stack[tos--]; \
stack[--tos]; \
})
# define push(x) \
do { \
@ -202,7 +202,7 @@ do { \
} while (0)
# define pick(n) \
({ \
unsigned int _index = tos - (n); \
unsigned int _index = tos - 1 - (n); \
if (_index >= MAX_EXPR_STACK_SIZE) \
{ \
Debug (1, "Out-of-stack pick\n"); \
@ -215,10 +215,14 @@ do { \
arg = c->as_arg;
a = unw_get_accessors (as);
end_addr = *addr + len;
*is_register = 0;
Debug (14, "len=%lu, pushing cfa=0x%lx\n",
(unsigned long) len, (unsigned long) c->cfa);
push (c->cfa); /* push current CFA as required by DWARF spec */
while (*addr < len)
while (*addr < end_addr)
{
if ((ret = dwarf_readu8 (as, a, addr, &opcode, arg)) < 0)
return ret;
@ -251,7 +255,8 @@ do { \
case DW_OP_lit24: case DW_OP_lit25: case DW_OP_lit26:
case DW_OP_lit27: case DW_OP_lit28: case DW_OP_lit29:
case DW_OP_lit30: case DW_OP_lit31:
push (opcode = DW_OP_lit0);
Debug (15, "OP_lit(%d)\n", (int) opcode - DW_OP_lit0);
push (opcode - DW_OP_lit0);
break;
case DW_OP_breg0: case DW_OP_breg1: case DW_OP_breg2:
@ -265,6 +270,8 @@ do { \
case DW_OP_breg24: case DW_OP_breg25: case DW_OP_breg26:
case DW_OP_breg27: case DW_OP_breg28: case DW_OP_breg29:
case DW_OP_breg30: case DW_OP_breg31:
Debug (15, "OP_breg(r%d,0x%lx)\n",
(int) opcode - DW_OP_breg0, (unsigned long) operand1);
if ((ret = unw_get_reg (dwarf_to_cursor (c),
dwarf_to_unw_regnum (opcode - DW_OP_breg0),
&tmp1)) < 0)
@ -273,6 +280,8 @@ do { \
break;
case DW_OP_bregx:
Debug (15, "OP_bregx(r%d,0x%lx)\n",
(int) operand1, (unsigned long) operand2);
if ((ret = unw_get_reg (dwarf_to_cursor (c),
dwarf_to_unw_regnum (operand1), &tmp1)) < 0)
return ret;
@ -290,11 +299,13 @@ do { \
case DW_OP_reg24: case DW_OP_reg25: case DW_OP_reg26:
case DW_OP_reg27: case DW_OP_reg28: case DW_OP_reg29:
case DW_OP_reg30: case DW_OP_reg31:
Debug (15, "OP_reg(r%d)\n", (int) opcode - DW_OP_reg0);
*valp = dwarf_to_unw_regnum (opcode - DW_OP_reg0);
*is_register = 1;
return 0;
case DW_OP_regx:
Debug (15, "OP_regx(r%d)\n", (int) operand1);
*valp = dwarf_to_unw_regnum (operand1);
*is_register = 1;
return 0;
@ -307,28 +318,33 @@ do { \
case DW_OP_constu:
case DW_OP_const8s:
case DW_OP_consts:
Debug (15, "OP_const(0x%lx)\n", (unsigned long) operand1);
push (operand1);
break;
case DW_OP_const1s:
if (operand1 & 0x80)
operand1 |= ((unw_word_t) -1) << 8;
Debug (15, "OP_const1s(%ld)\n", (long) operand1);
push (operand1);
break;
case DW_OP_const2s:
if (operand1 & 0x8000)
operand1 |= ((unw_word_t) -1) << 16;
Debug (15, "OP_const2s(%ld)\n", (long) operand1);
push (operand1);
break;
case DW_OP_const4s:
if (operand1 & 0x80000000)
operand1 |= (((unw_word_t) -1) << 16) << 16;
Debug (15, "OP_const4s(%ld)\n", (long) operand1);
push (operand1);
break;
case DW_OP_deref:
Debug (15, "OP_deref\n");
tmp1 = pop ();
if ((ret = dwarf_readw (as, a, &tmp1, &tmp2, arg)) < 0)
return ret;
@ -336,6 +352,7 @@ do { \
break;
case DW_OP_deref_size:
Debug (15, "OP_deref_size(%d)\n", (int) operand1);
tmp1 = pop ();
switch (operand1)
{
@ -387,22 +404,27 @@ do { \
break;
case DW_OP_dup:
Debug (15, "OP_dup\n");
push (pick (0));
break;
case DW_OP_drop:
Debug (15, "OP_drop\n");
pop ();
break;
case DW_OP_pick:
Debug (15, "OP_pick(%d)\n", (int) operand1);
push (pick (operand1));
break;
case DW_OP_over:
Debug (15, "OP_over\n");
push (pick (1));
break;
case DW_OP_swap:
Debug (15, "OP_swap\n");
tmp1 = pop ();
tmp2 = pop ();
push (tmp1);
@ -410,6 +432,7 @@ do { \
break;
case DW_OP_rot:
Debug (15, "OP_rot\n");
tmp1 = pop ();
tmp2 = pop ();
tmp3 = pop ();
@ -419,6 +442,7 @@ do { \
break;
case DW_OP_abs:
Debug (15, "OP_abs\n");
tmp1 = pop ();
if (tmp1 & ((unw_word_t) 1 << (8 * sizeof (unw_word_t) - 1)))
tmp1 = -tmp1;
@ -426,12 +450,14 @@ do { \
break;
case DW_OP_and:
Debug (15, "OP_and\n");
tmp1 = pop ();
tmp2 = pop ();
push (tmp1 & tmp2);
break;
case DW_OP_div:
Debug (15, "OP_div\n");
tmp1 = pop ();
tmp2 = pop ();
if (tmp1)
@ -440,6 +466,7 @@ do { \
break;
case DW_OP_minus:
Debug (15, "OP_minus\n");
tmp1 = pop ();
tmp2 = pop ();
tmp1 = tmp2 - tmp1;
@ -447,6 +474,7 @@ do { \
break;
case DW_OP_mod:
Debug (15, "OP_mod\n");
tmp1 = pop ();
tmp2 = pop ();
if (tmp1)
@ -455,6 +483,7 @@ do { \
break;
case DW_OP_mul:
Debug (15, "OP_mul\n");
tmp1 = pop ();
tmp2 = pop ();
if (tmp1)
@ -463,101 +492,119 @@ do { \
break;
case DW_OP_neg:
Debug (15, "OP_neg\n");
push (-pop ());
break;
case DW_OP_not:
Debug (15, "OP_not\n");
push (~pop ());
break;
case DW_OP_or:
Debug (15, "OP_or\n");
tmp1 = pop ();
tmp2 = pop ();
push (tmp1 | tmp2);
break;
case DW_OP_plus:
Debug (15, "OP_plus\n");
tmp1 = pop ();
tmp2 = pop ();
push (tmp1 + tmp2);
break;
case DW_OP_plus_uconst:
Debug (15, "OP_plus_uconst(%lu)\n", (unsigned long) operand1);
tmp1 = pop ();
push (tmp1 + operand1);
break;
case DW_OP_shl:
Debug (15, "OP_shl\n");
tmp1 = pop ();
tmp2 = pop ();
push (tmp2 << tmp1);
break;
case DW_OP_shr:
Debug (15, "OP_shr\n");
tmp1 = pop ();
tmp2 = pop ();
push (tmp2 >> tmp1);
break;
case DW_OP_shra:
Debug (15, "OP_shra\n");
tmp1 = pop ();
tmp2 = pop ();
push (sword (tmp2) >> tmp1);
break;
case DW_OP_xor:
Debug (15, "OP_xor\n");
tmp1 = pop ();
tmp2 = pop ();
push (tmp1 ^ tmp2);
break;
case DW_OP_le:
Debug (15, "OP_le\n");
tmp1 = pop ();
tmp2 = pop ();
push (sword (tmp1) <= sword (tmp2));
break;
case DW_OP_ge:
Debug (15, "OP_ge\n");
tmp1 = pop ();
tmp2 = pop ();
push (sword (tmp1) >= sword (tmp2));
break;
case DW_OP_eq:
Debug (15, "OP_eq\n");
tmp1 = pop ();
tmp2 = pop ();
push (sword (tmp1) == sword (tmp2));
break;
case DW_OP_lt:
Debug (15, "OP_lt\n");
tmp1 = pop ();
tmp2 = pop ();
push (sword (tmp1) < sword (tmp2));
break;
case DW_OP_gt:
Debug (15, "OP_gt\n");
tmp1 = pop ();
tmp2 = pop ();
push (sword (tmp1) > sword (tmp2));
break;
case DW_OP_ne:
Debug (15, "OP_ne\n");
tmp1 = pop ();
tmp2 = pop ();
push (sword (tmp1) != sword (tmp2));
break;
case DW_OP_skip:
Debug (15, "OP_skip(%d)\n", (int16_t) operand1);
*addr += (int16_t) operand1;
break;
case DW_OP_bra:
Debug (15, "OP_skip(%d)\n", (int16_t) operand1);
tmp1 = pop ();
if (tmp1)
*addr += (int16_t) operand1;
break;
case DW_OP_nop:
Debug (15, "OP_nop\n");
break;
case DW_OP_call2:
@ -574,5 +621,6 @@ do { \
}
}
*valp = pop ();
Debug (14, "final value = 0x%lx\n", (unsigned long) *valp);
return 0;
}