330 lines
6.8 KiB
C
330 lines
6.8 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
#include "block-range.h"
|
||
|
|
#include "annotate.h"
|
||
|
|
|
||
|
|
struct {
|
||
|
|
struct rb_root root;
|
||
|
|
u64 blocks;
|
||
|
|
} block_ranges;
|
||
|
|
|
||
|
|
static void block_range__debug(void)
|
||
|
|
{
|
||
|
|
/*
|
||
|
|
* XXX still paranoid for now; see if we can make this depend on
|
||
|
|
* DEBUG=1 builds.
|
||
|
|
*/
|
||
|
|
#if 1
|
||
|
|
struct rb_node *rb;
|
||
|
|
u64 old = 0; /* NULL isn't executable */
|
||
|
|
|
||
|
|
for (rb = rb_first(&block_ranges.root); rb; rb = rb_next(rb)) {
|
||
|
|
struct block_range *entry = rb_entry(rb, struct block_range, node);
|
||
|
|
|
||
|
|
assert(old < entry->start);
|
||
|
|
assert(entry->start <= entry->end); /* single instruction block; jump to a jump */
|
||
|
|
|
||
|
|
old = entry->end;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
struct block_range *block_range__find(u64 addr)
|
||
|
|
{
|
||
|
|
struct rb_node **p = &block_ranges.root.rb_node;
|
||
|
|
struct rb_node *parent = NULL;
|
||
|
|
struct block_range *entry;
|
||
|
|
|
||
|
|
while (*p != NULL) {
|
||
|
|
parent = *p;
|
||
|
|
entry = rb_entry(parent, struct block_range, node);
|
||
|
|
|
||
|
|
if (addr < entry->start)
|
||
|
|
p = &parent->rb_left;
|
||
|
|
else if (addr > entry->end)
|
||
|
|
p = &parent->rb_right;
|
||
|
|
else
|
||
|
|
return entry;
|
||
|
|
}
|
||
|
|
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void rb_link_left_of_node(struct rb_node *left, struct rb_node *node)
|
||
|
|
{
|
||
|
|
struct rb_node **p = &node->rb_left;
|
||
|
|
while (*p) {
|
||
|
|
node = *p;
|
||
|
|
p = &node->rb_right;
|
||
|
|
}
|
||
|
|
rb_link_node(left, node, p);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void rb_link_right_of_node(struct rb_node *right, struct rb_node *node)
|
||
|
|
{
|
||
|
|
struct rb_node **p = &node->rb_right;
|
||
|
|
while (*p) {
|
||
|
|
node = *p;
|
||
|
|
p = &node->rb_left;
|
||
|
|
}
|
||
|
|
rb_link_node(right, node, p);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* block_range__create
|
||
|
|
* @start: branch target starting this basic block
|
||
|
|
* @end: branch ending this basic block
|
||
|
|
*
|
||
|
|
* Create all the required block ranges to precisely span the given range.
|
||
|
|
*/
|
||
|
|
struct block_range_iter block_range__create(u64 start, u64 end)
|
||
|
|
{
|
||
|
|
struct rb_node **p = &block_ranges.root.rb_node;
|
||
|
|
struct rb_node *n, *parent = NULL;
|
||
|
|
struct block_range *next, *entry = NULL;
|
||
|
|
struct block_range_iter iter = { NULL, NULL };
|
||
|
|
|
||
|
|
while (*p != NULL) {
|
||
|
|
parent = *p;
|
||
|
|
entry = rb_entry(parent, struct block_range, node);
|
||
|
|
|
||
|
|
if (start < entry->start)
|
||
|
|
p = &parent->rb_left;
|
||
|
|
else if (start > entry->end)
|
||
|
|
p = &parent->rb_right;
|
||
|
|
else
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Didn't find anything.. there's a hole at @start, however @end might
|
||
|
|
* be inside/behind the next range.
|
||
|
|
*/
|
||
|
|
if (!*p) {
|
||
|
|
if (!entry) /* tree empty */
|
||
|
|
goto do_whole;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* If the last node is before, advance one to find the next.
|
||
|
|
*/
|
||
|
|
n = parent;
|
||
|
|
if (entry->end < start) {
|
||
|
|
n = rb_next(n);
|
||
|
|
if (!n)
|
||
|
|
goto do_whole;
|
||
|
|
}
|
||
|
|
next = rb_entry(n, struct block_range, node);
|
||
|
|
|
||
|
|
if (next->start <= end) { /* add head: [start...][n->start...] */
|
||
|
|
struct block_range *head = malloc(sizeof(struct block_range));
|
||
|
|
if (!head)
|
||
|
|
return iter;
|
||
|
|
|
||
|
|
*head = (struct block_range){
|
||
|
|
.start = start,
|
||
|
|
.end = next->start - 1,
|
||
|
|
.is_target = 1,
|
||
|
|
.is_branch = 0,
|
||
|
|
};
|
||
|
|
|
||
|
|
rb_link_left_of_node(&head->node, &next->node);
|
||
|
|
rb_insert_color(&head->node, &block_ranges.root);
|
||
|
|
block_range__debug();
|
||
|
|
|
||
|
|
iter.start = head;
|
||
|
|
goto do_tail;
|
||
|
|
}
|
||
|
|
|
||
|
|
do_whole:
|
||
|
|
/*
|
||
|
|
* The whole [start..end] range is non-overlapping.
|
||
|
|
*/
|
||
|
|
entry = malloc(sizeof(struct block_range));
|
||
|
|
if (!entry)
|
||
|
|
return iter;
|
||
|
|
|
||
|
|
*entry = (struct block_range){
|
||
|
|
.start = start,
|
||
|
|
.end = end,
|
||
|
|
.is_target = 1,
|
||
|
|
.is_branch = 1,
|
||
|
|
};
|
||
|
|
|
||
|
|
rb_link_node(&entry->node, parent, p);
|
||
|
|
rb_insert_color(&entry->node, &block_ranges.root);
|
||
|
|
block_range__debug();
|
||
|
|
|
||
|
|
iter.start = entry;
|
||
|
|
iter.end = entry;
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* We found a range that overlapped with ours, split if needed.
|
||
|
|
*/
|
||
|
|
if (entry->start < start) { /* split: [e->start...][start...] */
|
||
|
|
struct block_range *head = malloc(sizeof(struct block_range));
|
||
|
|
if (!head)
|
||
|
|
return iter;
|
||
|
|
|
||
|
|
*head = (struct block_range){
|
||
|
|
.start = entry->start,
|
||
|
|
.end = start - 1,
|
||
|
|
.is_target = entry->is_target,
|
||
|
|
.is_branch = 0,
|
||
|
|
|
||
|
|
.coverage = entry->coverage,
|
||
|
|
.entry = entry->entry,
|
||
|
|
};
|
||
|
|
|
||
|
|
entry->start = start;
|
||
|
|
entry->is_target = 1;
|
||
|
|
entry->entry = 0;
|
||
|
|
|
||
|
|
rb_link_left_of_node(&head->node, &entry->node);
|
||
|
|
rb_insert_color(&head->node, &block_ranges.root);
|
||
|
|
block_range__debug();
|
||
|
|
|
||
|
|
} else if (entry->start == start)
|
||
|
|
entry->is_target = 1;
|
||
|
|
|
||
|
|
iter.start = entry;
|
||
|
|
|
||
|
|
do_tail:
|
||
|
|
/*
|
||
|
|
* At this point we've got: @iter.start = [@start...] but @end can still be
|
||
|
|
* inside or beyond it.
|
||
|
|
*/
|
||
|
|
entry = iter.start;
|
||
|
|
for (;;) {
|
||
|
|
/*
|
||
|
|
* If @end is inside @entry, split.
|
||
|
|
*/
|
||
|
|
if (end < entry->end) { /* split: [...end][...e->end] */
|
||
|
|
struct block_range *tail = malloc(sizeof(struct block_range));
|
||
|
|
if (!tail)
|
||
|
|
return iter;
|
||
|
|
|
||
|
|
*tail = (struct block_range){
|
||
|
|
.start = end + 1,
|
||
|
|
.end = entry->end,
|
||
|
|
.is_target = 0,
|
||
|
|
.is_branch = entry->is_branch,
|
||
|
|
|
||
|
|
.coverage = entry->coverage,
|
||
|
|
.taken = entry->taken,
|
||
|
|
.pred = entry->pred,
|
||
|
|
};
|
||
|
|
|
||
|
|
entry->end = end;
|
||
|
|
entry->is_branch = 1;
|
||
|
|
entry->taken = 0;
|
||
|
|
entry->pred = 0;
|
||
|
|
|
||
|
|
rb_link_right_of_node(&tail->node, &entry->node);
|
||
|
|
rb_insert_color(&tail->node, &block_ranges.root);
|
||
|
|
block_range__debug();
|
||
|
|
|
||
|
|
iter.end = entry;
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* If @end matches @entry, done
|
||
|
|
*/
|
||
|
|
if (end == entry->end) {
|
||
|
|
entry->is_branch = 1;
|
||
|
|
iter.end = entry;
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
|
||
|
|
next = block_range__next(entry);
|
||
|
|
if (!next)
|
||
|
|
goto add_tail;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* If @end is in beyond @entry but not inside @next, add tail.
|
||
|
|
*/
|
||
|
|
if (end < next->start) { /* add tail: [...e->end][...end] */
|
||
|
|
struct block_range *tail;
|
||
|
|
add_tail:
|
||
|
|
tail = malloc(sizeof(struct block_range));
|
||
|
|
if (!tail)
|
||
|
|
return iter;
|
||
|
|
|
||
|
|
*tail = (struct block_range){
|
||
|
|
.start = entry->end + 1,
|
||
|
|
.end = end,
|
||
|
|
.is_target = 0,
|
||
|
|
.is_branch = 1,
|
||
|
|
};
|
||
|
|
|
||
|
|
rb_link_right_of_node(&tail->node, &entry->node);
|
||
|
|
rb_insert_color(&tail->node, &block_ranges.root);
|
||
|
|
block_range__debug();
|
||
|
|
|
||
|
|
iter.end = tail;
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* If there is a hole between @entry and @next, fill it.
|
||
|
|
*/
|
||
|
|
if (entry->end + 1 != next->start) {
|
||
|
|
struct block_range *hole = malloc(sizeof(struct block_range));
|
||
|
|
if (!hole)
|
||
|
|
return iter;
|
||
|
|
|
||
|
|
*hole = (struct block_range){
|
||
|
|
.start = entry->end + 1,
|
||
|
|
.end = next->start - 1,
|
||
|
|
.is_target = 0,
|
||
|
|
.is_branch = 0,
|
||
|
|
};
|
||
|
|
|
||
|
|
rb_link_left_of_node(&hole->node, &next->node);
|
||
|
|
rb_insert_color(&hole->node, &block_ranges.root);
|
||
|
|
block_range__debug();
|
||
|
|
}
|
||
|
|
|
||
|
|
entry = next;
|
||
|
|
}
|
||
|
|
|
||
|
|
done:
|
||
|
|
assert(iter.start->start == start && iter.start->is_target);
|
||
|
|
assert(iter.end->end == end && iter.end->is_branch);
|
||
|
|
|
||
|
|
block_ranges.blocks++;
|
||
|
|
|
||
|
|
return iter;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Compute coverage as:
|
||
|
|
*
|
||
|
|
* br->coverage / br->sym->max_coverage
|
||
|
|
*
|
||
|
|
* This ensures each symbol has a 100% spot, to reflect that each symbol has a
|
||
|
|
* most covered section.
|
||
|
|
*
|
||
|
|
* Returns [0-1] for coverage and -1 if we had no data what so ever or the
|
||
|
|
* symbol does not exist.
|
||
|
|
*/
|
||
|
|
double block_range__coverage(struct block_range *br)
|
||
|
|
{
|
||
|
|
struct symbol *sym;
|
||
|
|
|
||
|
|
if (!br) {
|
||
|
|
if (block_ranges.blocks)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
sym = br->sym;
|
||
|
|
if (!sym)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
return (double)br->coverage / symbol__annotation(sym)->max_coverage;
|
||
|
|
}
|