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dtc: implement labels on property data

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Extend the parser grammer to allow labels before or after any
property data (string, cell list, or byte list), and any
byte or cell within the property data.

Store the labels using the same linked list structure as node
references, but using a parallel list.

When writing assembly output emit global labels as offsets from
the start of the definition of the data.

Note that the alignment for a cell list is done as part of the
opening < delimiter, not the = or , before it.  To label a cell
after a string or byte list put the label inside the cell list.

For example,
	prop = zero: [ aa bb ], two: < four: 1234 > eight: ;
will produce labels with offsets 0, 2, 4, and 8 bytes from
the beginning of the data for property prop.

Signed-off-by: Milton Miller <miltonm@bga.com>
This commit is contained in:
Milton Miller 2007-07-07 01:18:51 -05:00 • committed by Jon Loeliger
parent ac6a5e26b4
commit 6a99b13132
4 changed files with 60 additions and 12 deletions
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13
flattree.c
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@ -121,6 +121,12 @@ static void emit_label(FILE *f, char *prefix, char *label)
fprintf(f, "_%s_%s:\n", prefix, label);
}
static void emit_offset_label(FILE *f, char *label, int offset)
{
fprintf(f, "\t.globl\t%s\n", label);
fprintf(f, "%s\t= . + %d\n", label, offset);
}
static void asm_emit_cell(void *e, cell_t val)
{
FILE *f = e;
@ -157,6 +163,13 @@ static void asm_emit_data(void *e, struct data d)
{
FILE *f = e;
int off = 0;
struct fixup *l;
l = d.labels;
while (l) {
emit_offset_label(f, l->ref, l->offset);
l = l->next;
}
while ((d.len - off) >= sizeof(u32)) {
fprintf(f, "\t.long\t0x%x\n",