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linux/tools/perf/ui/browser.c
Ravi Bangoria 7efbcc8c07 perf annotate: Fix fused instr logic for assembly functions 
Some x86 microarchitectures fuse a subset of cmp/test/ALU instructions
with branch instructions, and thus perf annotate highlight such valid
pairs as fused.

When annotated with source, perf uses struct disasm_line to contain
either source or instruction line from objdump output. Usually, a C
statement generates multiple instructions which include such
cmp/test/ALU + branch instruction pairs. But in case of assembly
function, each individual assembly source line generate one
instruction.

The 'perf annotate' instruction fusion logic assumes the previous
disasm_line as the previous instruction line, which is wrong because,
for assembly function, previous disasm_line contains source line.  And
thus perf fails to highlight valid fused instruction pairs for assembly
functions.

Fix it by searching backward until we find an instruction line and
consider that disasm_line as fused with current branch instruction.

Before:
         │    cmpq    %rcx, RIP+8(%rsp)
    0.00 │      cmp    %rcx,0x88(%rsp)
         │    je      .Lerror_bad_iret      <--- Source line
    0.14 │   ┌──je     b4                   <--- Instruction line
         │   │movl    %ecx, %eax

After:
         │    cmpq    %rcx, RIP+8(%rsp)
    0.00 │   ┌──cmp    %rcx,0x88(%rsp)
         │   │je      .Lerror_bad_iret
    0.14 │   ├──je     b4
         │   │movl    %ecx, %eax

Reviewed-by: Jin Yao <yao.jin@linux.intel.com>
Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kim Phillips <kim.phillips@amd.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https //lore.kernel.org/r/20210911043854.8373-1-ravi.bangoria@amd.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2021-09-18 17:43:05 -03:00

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// SPDX-License-Identifier: GPL-2.0
#include "../util/string2.h"
#include "../util/config.h"
#include "libslang.h"
#include "ui.h"
#include "util.h"
#include <linux/compiler.h>
#include <linux/list.h>
#include <linux/rbtree.h>
#include <linux/string.h>
#include <stdlib.h>
#include <sys/ttydefaults.h>
#include "browser.h"
#include "helpline.h"
#include "keysyms.h"
#include "../util/color.h"
#include <linux/ctype.h>
#include <linux/zalloc.h>
static int ui_browser__percent_color(struct ui_browser *browser,
double percent, bool current)
{
if (current && (!browser->use_navkeypressed || browser->navkeypressed))
return HE_COLORSET_SELECTED;
if (percent >= MIN_RED)
return HE_COLORSET_TOP;
if (percent >= MIN_GREEN)
return HE_COLORSET_MEDIUM;
return HE_COLORSET_NORMAL;
}
int ui_browser__set_color(struct ui_browser *browser, int color)
{
int ret = browser->current_color;
browser->current_color = color;
SLsmg_set_color(color);
return ret;
}
void ui_browser__set_percent_color(struct ui_browser *browser,
double percent, bool current)
{
int color = ui_browser__percent_color(browser, percent, current);
ui_browser__set_color(browser, color);
}
void ui_browser__gotorc_title(struct ui_browser *browser, int y, int x)
{
SLsmg_gotorc(browser->y + y, browser->x + x);
}
void ui_browser__gotorc(struct ui_browser *browser, int y, int x)
{
SLsmg_gotorc(browser->y + y + browser->extra_title_lines, browser->x + x);
}
void ui_browser__write_nstring(struct ui_browser *browser __maybe_unused, const char *msg,
unsigned int width)
{
slsmg_write_nstring(msg, width);
}
void ui_browser__vprintf(struct ui_browser *browser __maybe_unused, const char *fmt, va_list args)
{
slsmg_vprintf(fmt, args);
}
void ui_browser__printf(struct ui_browser *browser __maybe_unused, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
ui_browser__vprintf(browser, fmt, args);
va_end(args);
}
static struct list_head *
ui_browser__list_head_filter_entries(struct ui_browser *browser,
struct list_head *pos)
{
do {
if (!browser->filter || !browser->filter(browser, pos))
return pos;
pos = pos->next;
} while (pos != browser->entries);
return NULL;
}
static struct list_head *
ui_browser__list_head_filter_prev_entries(struct ui_browser *browser,
struct list_head *pos)
{
do {
if (!browser->filter || !browser->filter(browser, pos))
return pos;
pos = pos->prev;
} while (pos != browser->entries);
return NULL;
}
void ui_browser__list_head_seek(struct ui_browser *browser, off_t offset, int whence)
{
struct list_head *head = browser->entries;
struct list_head *pos;
if (browser->nr_entries == 0)
return;
switch (whence) {
case SEEK_SET:
pos = ui_browser__list_head_filter_entries(browser, head->next);
break;
case SEEK_CUR:
pos = browser->top;
break;
case SEEK_END:
pos = ui_browser__list_head_filter_prev_entries(browser, head->prev);
break;
default:
return;
}
assert(pos != NULL);
if (offset > 0) {
while (offset-- != 0)
pos = ui_browser__list_head_filter_entries(browser, pos->next);
} else {
while (offset++ != 0)
pos = ui_browser__list_head_filter_prev_entries(browser, pos->prev);
}
browser->top = pos;
}
void ui_browser__rb_tree_seek(struct ui_browser *browser, off_t offset, int whence)
{
struct rb_root *root = browser->entries;
struct rb_node *nd;
switch (whence) {
case SEEK_SET:
nd = rb_first(root);
break;
case SEEK_CUR:
nd = browser->top;
break;
case SEEK_END:
nd = rb_last(root);
break;
default:
return;
}
if (offset > 0) {
while (offset-- != 0)
nd = rb_next(nd);
} else {
while (offset++ != 0)
nd = rb_prev(nd);
}
browser->top = nd;
}
unsigned int ui_browser__rb_tree_refresh(struct ui_browser *browser)
{
struct rb_node *nd;
int row = 0;
if (browser->top == NULL)
browser->top = rb_first(browser->entries);
nd = browser->top;
while (nd != NULL) {
ui_browser__gotorc(browser, row, 0);
browser->write(browser, nd, row);
if (++row == browser->rows)
break;
nd = rb_next(nd);
}
return row;
}
bool ui_browser__is_current_entry(struct ui_browser *browser, unsigned row)
{
return browser->top_idx + row == browser->index;
}
void ui_browser__refresh_dimensions(struct ui_browser *browser)
{
browser->width = SLtt_Screen_Cols - 1;
browser->height = browser->rows = SLtt_Screen_Rows - 2;
browser->rows -= browser->extra_title_lines;
browser->y = 1;
browser->x = 0;
}
void ui_browser__handle_resize(struct ui_browser *browser)
{
ui__refresh_dimensions(false);
ui_browser__show(browser, browser->title, ui_helpline__current);
ui_browser__refresh(browser);
}
int ui_browser__warning(struct ui_browser *browser, int timeout,
const char *format, ...)
{
va_list args;
char *text;
int key = 0, err;
va_start(args, format);
err = vasprintf(&text, format, args);
va_end(args);
if (err < 0) {
va_start(args, format);
ui_helpline__vpush(format, args);
va_end(args);
} else {
while ((key = ui__question_window("Warning!", text,
"Press any key...",
timeout)) == K_RESIZE)
ui_browser__handle_resize(browser);
free(text);
}
return key;
}
int ui_browser__help_window(struct ui_browser *browser, const char *text)
{
int key;
while ((key = ui__help_window(text)) == K_RESIZE)
ui_browser__handle_resize(browser);
return key;
}
bool ui_browser__dialog_yesno(struct ui_browser *browser, const char *text)
{
int key;
while ((key = ui__dialog_yesno(text)) == K_RESIZE)
ui_browser__handle_resize(browser);
return key == K_ENTER || toupper(key) == 'Y';
}
void ui_browser__reset_index(struct ui_browser *browser)
{
browser->index = browser->top_idx = 0;
browser->seek(browser, 0, SEEK_SET);
}
void __ui_browser__show_title(struct ui_browser *browser, const char *title)
{
SLsmg_gotorc(0, 0);
ui_browser__set_color(browser, HE_COLORSET_ROOT);
ui_browser__write_nstring(browser, title, browser->width + 1);
}
void ui_browser__show_title(struct ui_browser *browser, const char *title)
{
pthread_mutex_lock(&ui__lock);
__ui_browser__show_title(browser, title);
pthread_mutex_unlock(&ui__lock);
}
int ui_browser__show(struct ui_browser *browser, const char *title,
const char *helpline, ...)
{
int err;
va_list ap;
if (browser->refresh_dimensions == NULL)
browser->refresh_dimensions = ui_browser__refresh_dimensions;
browser->refresh_dimensions(browser);
pthread_mutex_lock(&ui__lock);
__ui_browser__show_title(browser, title);
browser->title = title;
zfree(&browser->helpline);
va_start(ap, helpline);
err = vasprintf(&browser->helpline, helpline, ap);
va_end(ap);
if (err > 0)
ui_helpline__push(browser->helpline);
pthread_mutex_unlock(&ui__lock);
return err ? 0 : -1;
}
void ui_browser__hide(struct ui_browser *browser)
{
pthread_mutex_lock(&ui__lock);
ui_helpline__pop();
zfree(&browser->helpline);
pthread_mutex_unlock(&ui__lock);
}
static void ui_browser__scrollbar_set(struct ui_browser *browser)
{
int height = browser->height, h = 0, pct = 0,
col = browser->width,
row = 0;
if (browser->nr_entries > 1) {
pct = ((browser->index * (browser->height - 1)) /
(browser->nr_entries - 1));
}
SLsmg_set_char_set(1);
while (h < height) {
ui_browser__gotorc(browser, row++, col);
SLsmg_write_char(h == pct ? SLSMG_DIAMOND_CHAR : SLSMG_CKBRD_CHAR);
++h;
}
SLsmg_set_char_set(0);
}
static int __ui_browser__refresh(struct ui_browser *browser)
{
int row;
int width = browser->width;
row = browser->refresh(browser);
ui_browser__set_color(browser, HE_COLORSET_NORMAL);
if (!browser->use_navkeypressed || browser->navkeypressed)
ui_browser__scrollbar_set(browser);
else
width += 1;
SLsmg_fill_region(browser->y + row + browser->extra_title_lines, browser->x,
browser->rows - row, width, ' ');
if (browser->nr_entries == 0 && browser->no_samples_msg)
__ui__info_window(NULL, browser->no_samples_msg, NULL);
return 0;
}
int ui_browser__refresh(struct ui_browser *browser)
{
pthread_mutex_lock(&ui__lock);
__ui_browser__refresh(browser);
pthread_mutex_unlock(&ui__lock);
return 0;
}
/*
* Here we're updating nr_entries _after_ we started browsing, i.e. we have to
* forget about any reference to any entry in the underlying data structure,
* that is why we do a SEEK_SET. Think about 'perf top' in the hists browser
* after an output_resort and hist decay.
*/
void ui_browser__update_nr_entries(struct ui_browser *browser, u32 nr_entries)
{
off_t offset = nr_entries - browser->nr_entries;
browser->nr_entries = nr_entries;
if (offset < 0) {
if (browser->top_idx < (u64)-offset)
offset = -browser->top_idx;
browser->index += offset;
browser->top_idx += offset;
}
browser->top = NULL;
browser->seek(browser, browser->top_idx, SEEK_SET);
}
int ui_browser__run(struct ui_browser *browser, int delay_secs)
{
int err, key;
while (1) {
off_t offset;
pthread_mutex_lock(&ui__lock);
err = __ui_browser__refresh(browser);
SLsmg_refresh();
pthread_mutex_unlock(&ui__lock);
if (err < 0)
break;
key = ui__getch(delay_secs);
if (key == K_RESIZE) {
ui__refresh_dimensions(false);
browser->refresh_dimensions(browser);
__ui_browser__show_title(browser, browser->title);
ui_helpline__puts(browser->helpline);
continue;
}
if (browser->use_navkeypressed && !browser->navkeypressed) {
if (key == K_DOWN || key == K_UP ||
(browser->columns && (key == K_LEFT || key == K_RIGHT)) ||
key == K_PGDN || key == K_PGUP ||
key == K_HOME || key == K_END ||
key == ' ') {
browser->navkeypressed = true;
continue;
} else
return key;
}
switch (key) {
case K_DOWN:
if (browser->index == browser->nr_entries - 1)
break;
++browser->index;
if (browser->index == browser->top_idx + browser->rows) {
++browser->top_idx;
browser->seek(browser, +1, SEEK_CUR);
}
break;
case K_UP:
if (browser->index == 0)
break;
--browser->index;
if (browser->index < browser->top_idx) {
--browser->top_idx;
browser->seek(browser, -1, SEEK_CUR);
}
break;
case K_RIGHT:
if (!browser->columns)
goto out;
if (browser->horiz_scroll < browser->columns - 1)
++browser->horiz_scroll;
break;
case K_LEFT:
if (!browser->columns)
goto out;
if (browser->horiz_scroll != 0)
--browser->horiz_scroll;
break;
case K_PGDN:
case ' ':
if (browser->top_idx + browser->rows > browser->nr_entries - 1)
break;
offset = browser->rows;
if (browser->index + offset > browser->nr_entries - 1)
offset = browser->nr_entries - 1 - browser->index;
browser->index += offset;
browser->top_idx += offset;
browser->seek(browser, +offset, SEEK_CUR);
break;
case K_PGUP:
if (browser->top_idx == 0)
break;
if (browser->top_idx < browser->rows)
offset = browser->top_idx;
else
offset = browser->rows;
browser->index -= offset;
browser->top_idx -= offset;
browser->seek(browser, -offset, SEEK_CUR);
break;
case K_HOME:
ui_browser__reset_index(browser);
break;
case K_END:
offset = browser->rows - 1;
if (offset >= browser->nr_entries)
offset = browser->nr_entries - 1;
browser->index = browser->nr_entries - 1;
browser->top_idx = browser->index - offset;
browser->seek(browser, -offset, SEEK_END);
break;
default:
out:
return key;
}
}
return -1;
}
unsigned int ui_browser__list_head_refresh(struct ui_browser *browser)
{
struct list_head *pos;
struct list_head *head = browser->entries;
int row = 0;
if (browser->top == NULL || browser->top == browser->entries)
browser->top = ui_browser__list_head_filter_entries(browser, head->next);
pos = browser->top;
list_for_each_from(pos, head) {
if (!browser->filter || !browser->filter(browser, pos)) {
ui_browser__gotorc(browser, row, 0);
browser->write(browser, pos, row);
if (++row == browser->rows)
break;
}
}
return row;
}
static struct ui_browser_colorset {
const char *name, *fg, *bg;
int colorset;
} ui_browser__colorsets[] = {
{
.colorset = HE_COLORSET_TOP,
.name = "top",
.fg = "red",
.bg = "default",
},
{
.colorset = HE_COLORSET_MEDIUM,
.name = "medium",
.fg = "green",
.bg = "default",
},
{
.colorset = HE_COLORSET_NORMAL,
.name = "normal",
.fg = "default",
.bg = "default",
},
{
.colorset = HE_COLORSET_SELECTED,
.name = "selected",
.fg = "black",
.bg = "yellow",
},
{
.colorset = HE_COLORSET_JUMP_ARROWS,
.name = "jump_arrows",
.fg = "blue",
.bg = "default",
},
{
.colorset = HE_COLORSET_ADDR,
.name = "addr",
.fg = "magenta",
.bg = "default",
},
{
.colorset = HE_COLORSET_ROOT,
.name = "root",
.fg = "white",
.bg = "blue",
},
{
.name = NULL,
}
};
static int ui_browser__color_config(const char *var, const char *value,
void *data __maybe_unused)
{
char *fg = NULL, *bg;
int i;
/* same dir for all commands */
if (!strstarts(var, "colors.") != 0)
return 0;
for (i = 0; ui_browser__colorsets[i].name != NULL; ++i) {
const char *name = var + 7;
if (strcmp(ui_browser__colorsets[i].name, name) != 0)
continue;
fg = strdup(value);
if (fg == NULL)
break;
bg = strchr(fg, ',');
if (bg == NULL)
break;
*bg = '\0';
bg = skip_spaces(bg + 1);
ui_browser__colorsets[i].bg = bg;
ui_browser__colorsets[i].fg = fg;
return 0;
}
free(fg);
return -1;
}
void ui_browser__argv_seek(struct ui_browser *browser, off_t offset, int whence)
{
switch (whence) {
case SEEK_SET:
browser->top = browser->entries;
break;
case SEEK_CUR:
browser->top = (char **)browser->top + offset;
break;
case SEEK_END:
browser->top = (char **)browser->entries + browser->nr_entries - 1 + offset;
break;
default:
return;
}
assert((char **)browser->top < (char **)browser->entries + browser->nr_entries);
assert((char **)browser->top >= (char **)browser->entries);
}
unsigned int ui_browser__argv_refresh(struct ui_browser *browser)
{
unsigned int row = 0, idx = browser->top_idx;
char **pos;
if (browser->top == NULL)
browser->top = browser->entries;
pos = (char **)browser->top;
while (idx < browser->nr_entries &&
row < (unsigned)SLtt_Screen_Rows - 1) {
assert(pos < (char **)browser->entries + browser->nr_entries);
if (!browser->filter || !browser->filter(browser, *pos)) {
ui_browser__gotorc(browser, row, 0);
browser->write(browser, pos, row);
if (++row == browser->rows)
break;
}
++idx;
++pos;
}
return row;
}
void __ui_browser__vline(struct ui_browser *browser, unsigned int column,
u16 start, u16 end)
{
SLsmg_set_char_set(1);
ui_browser__gotorc(browser, start, column);
SLsmg_draw_vline(end - start + 1);
SLsmg_set_char_set(0);
}
void ui_browser__write_graph(struct ui_browser *browser __maybe_unused,
int graph)
{
SLsmg_set_char_set(1);
SLsmg_write_char(graph);
SLsmg_set_char_set(0);
}
static void __ui_browser__line_arrow_up(struct ui_browser *browser,
unsigned int column,
u64 start, u64 end)
{
unsigned int row, end_row;
SLsmg_set_char_set(1);
if (start < browser->top_idx + browser->rows) {
row = start - browser->top_idx;
ui_browser__gotorc(browser, row, column);
SLsmg_write_char(SLSMG_LLCORN_CHAR);
ui_browser__gotorc(browser, row, column + 1);
SLsmg_draw_hline(2);
if (row-- == 0)
goto out;
} else
row = browser->rows - 1;
if (end > browser->top_idx)
end_row = end - browser->top_idx;
else
end_row = 0;
ui_browser__gotorc(browser, end_row, column);
SLsmg_draw_vline(row - end_row + 1);
ui_browser__gotorc(browser, end_row, column);
if (end >= browser->top_idx) {
SLsmg_write_char(SLSMG_ULCORN_CHAR);
ui_browser__gotorc(browser, end_row, column + 1);
SLsmg_write_char(SLSMG_HLINE_CHAR);
ui_browser__gotorc(browser, end_row, column + 2);
SLsmg_write_char(SLSMG_RARROW_CHAR);
}
out:
SLsmg_set_char_set(0);
}
static void __ui_browser__line_arrow_down(struct ui_browser *browser,
unsigned int column,
u64 start, u64 end)
{
unsigned int row, end_row;
SLsmg_set_char_set(1);
if (start >= browser->top_idx) {
row = start - browser->top_idx;
ui_browser__gotorc(browser, row, column);
SLsmg_write_char(SLSMG_ULCORN_CHAR);
ui_browser__gotorc(browser, row, column + 1);
SLsmg_draw_hline(2);
if (++row == 0)
goto out;
} else
row = 0;
if (end >= browser->top_idx + browser->rows)
end_row = browser->rows - 1;
else
end_row = end - browser->top_idx;
ui_browser__gotorc(browser, row, column);
SLsmg_draw_vline(end_row - row + 1);
ui_browser__gotorc(browser, end_row, column);
if (end < browser->top_idx + browser->rows) {
SLsmg_write_char(SLSMG_LLCORN_CHAR);
ui_browser__gotorc(browser, end_row, column + 1);
SLsmg_write_char(SLSMG_HLINE_CHAR);
ui_browser__gotorc(browser, end_row, column + 2);
SLsmg_write_char(SLSMG_RARROW_CHAR);
}
out:
SLsmg_set_char_set(0);
}
void __ui_browser__line_arrow(struct ui_browser *browser, unsigned int column,
u64 start, u64 end)
{
if (start > end)
__ui_browser__line_arrow_up(browser, column, start, end);
else
__ui_browser__line_arrow_down(browser, column, start, end);
}
void ui_browser__mark_fused(struct ui_browser *browser, unsigned int column,
unsigned int row, int diff, bool arrow_down)
{
int end_row;
if (diff <= 0)
return;
SLsmg_set_char_set(1);
if (arrow_down) {
if (row + diff <= browser->top_idx)
return;
end_row = row + diff - browser->top_idx;
ui_browser__gotorc(browser, end_row, column - 1);
SLsmg_write_char(SLSMG_LTEE_CHAR);
while (--end_row >= 0 && end_row > (int)(row - browser->top_idx)) {
ui_browser__gotorc(browser, end_row, column - 1);
SLsmg_draw_vline(1);
}
end_row = (int)(row - browser->top_idx);
if (end_row >= 0) {
ui_browser__gotorc(browser, end_row, column - 1);
SLsmg_write_char(SLSMG_ULCORN_CHAR);
ui_browser__gotorc(browser, end_row, column);
SLsmg_draw_hline(2);
}
} else {
if (row < browser->top_idx)
return;
end_row = row - browser->top_idx;
ui_browser__gotorc(browser, end_row, column - 1);
SLsmg_write_char(SLSMG_LTEE_CHAR);
ui_browser__gotorc(browser, end_row, column);
SLsmg_draw_hline(2);
}
SLsmg_set_char_set(0);
}
void ui_browser__init(void)
{
int i = 0;
perf_config(ui_browser__color_config, NULL);
while (ui_browser__colorsets[i].name) {
struct ui_browser_colorset *c = &ui_browser__colorsets[i++];
sltt_set_color(c->colorset, c->name, c->fg, c->bg);
}
}
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