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Add new -Z dump-mir-spanview option

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Similar to `-Z dump-mir-graphviz`, this adds the option to write
HTML+CSS files that allow users to analyze the spans associated with MIR
elements (by individual statement, just terminator, or overall basic
block).

This PR was split out from PR #76004, and exposes an API for spanview
HTML+CSS files that is also used to analyze code regions chosen for
coverage instrumentation (in a follow-on PR).

Rust compiler MCP rust-lang/compiler-team#278

Relevant issue: #34701 - Implement support for LLVMs code coverage
instrumentation
This commit is contained in:
Rich Kadel 2020-08-29 10:55:46 -07:00
parent 445f34bb14
commit 6b5869a0ae
11 changed files with 739 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

1
compiler/rustc_mir/src/util/mod.rs
View file

@ -9,6 +9,7 @@ mod alignment;
pub mod collect_writes; pub mod collect_writes;
mod graphviz; mod graphviz;
pub(crate) mod pretty; pub(crate) mod pretty;
pub(crate) mod spanview;
pub use self::aggregate::expand_aggregate; pub use self::aggregate::expand_aggregate;
pub use self::alignment::is_disaligned; pub use self::alignment::is_disaligned;

11
compiler/rustc_mir/src/util/pretty.rs
View file

@ -6,6 +6,7 @@ use std::io::{self, Write};
use std::path::{Path, PathBuf}; use std::path::{Path, PathBuf};
use super::graphviz::write_mir_fn_graphviz; use super::graphviz::write_mir_fn_graphviz;
use super::spanview::write_mir_fn_spanview;
use crate::transform::MirSource; use crate::transform::MirSource;
use either::Either; use either::Either;
use rustc_data_structures::fx::FxHashMap; use rustc_data_structures::fx::FxHashMap;
@ -147,6 +148,16 @@ fn dump_matched_mir_node<'tcx, F>(
write_mir_fn_graphviz(tcx, source.def_id(), body, false, &mut file)?; write_mir_fn_graphviz(tcx, source.def_id(), body, false, &mut file)?;
}; };
} }
if let Some(spanview) = tcx.sess.opts.debugging_opts.dump_mir_spanview {
let _: io::Result<()> = try {
let mut file =
create_dump_file(tcx, "html", pass_num, pass_name, disambiguator, source)?;
if source.def_id().is_local() {
write_mir_fn_spanview(tcx, source.def_id(), body, spanview, &mut file)?;
}
};
}
} }
/// Returns the path to the filename where we should dump a given MIR. /// Returns the path to the filename where we should dump a given MIR.

461
compiler/rustc_mir/src/util/spanview.rs Normal file
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@ -0,0 +1,461 @@
use rustc_hir::def_id::DefId;
use rustc_middle::hir;
use rustc_middle::mir::*;
use rustc_middle::ty::TyCtxt;
use rustc_session::config::MirSpanview;
use rustc_span::{BytePos, Pos, Span};
use std::io::{self, Write};
use std::iter::Peekable;
pub const TOOLTIP_INDENT: &str = " ";
const NEW_LINE_SPAN: &str = "</span>\n<span class=\"line\">";
const HEADER: &str = r#"<!DOCTYPE html>
<html>
<head>
<title>coverage_of_if_else - Code Regions</title>
<style>
.line {
counter-increment: line;
}
.line:before {
content: counter(line) ": ";
font-family: Menlo, Monaco, monospace;
font-style: italic;
width: 3.8em;
display: inline-block;
text-align: right;
filter: opacity(50%);
-webkit-user-select: none;
}
.code {
color: #dddddd;
background-color: #222222;
font-family: Menlo, Monaco, monospace;
line-height: 1.4em;
border-bottom: 2px solid #222222;
white-space: pre;
display: inline-block;
}
.odd {
background-color: #55bbff;
color: #223311;
}
.even {
background-color: #ee7756;
color: #551133;
}
.code {
--index: calc(var(--layer) - 1);
padding-top: calc(var(--index) * 0.15em);
filter:
hue-rotate(calc(var(--index) * 25deg))
saturate(calc(100% - (var(--index) * 2%)))
brightness(calc(100% - (var(--index) * 1.5%)));
}
.annotation {
color: #4444ff;
font-family: monospace;
font-style: italic;
display: none;
-webkit-user-select: none;
}
body:active .annotation {
/* requires holding mouse down anywhere on the page */
display: inline-block;
}
span:hover .annotation {
/* requires hover over a span ONLY on its first line */
display: inline-block;
}
</style>
</head>
<body>"#;
const FOOTER: &str = r#"
</body>
</html>"#;
/// Metadata to highlight the span of a MIR BasicBlock, Statement, or Terminator.
pub struct SpanViewable {
pub span: Span,
pub title: String,
pub tooltip: String,
}
/// Write a spanview HTML+CSS file to analyze MIR element spans.
pub fn write_mir_fn_spanview<'tcx, W>(
tcx: TyCtxt<'tcx>,
def_id: DefId,
body: &Body<'tcx>,
spanview: MirSpanview,
w: &mut W,
) -> io::Result<()>
where
W: Write,
{
let body_span = hir_body(tcx, def_id).value.span;
let mut span_viewables = Vec::new();
for (bb, data) in body.basic_blocks().iter_enumerated() {
match spanview {
MirSpanview::Statement => {
for (i, statement) in data.statements.iter().enumerate() {
if let Some(span_viewable) =
statement_span_viewable(tcx, body_span, bb, i, statement)
{
span_viewables.push(span_viewable);
}
}
if let Some(span_viewable) = terminator_span_viewable(tcx, body_span, bb, data) {
span_viewables.push(span_viewable);
}
}
MirSpanview::Terminator => {
if let Some(span_viewable) = terminator_span_viewable(tcx, body_span, bb, data) {
span_viewables.push(span_viewable);
}
}
MirSpanview::Block => {
if let Some(span_viewable) = block_span_viewable(tcx, body_span, bb, data) {
span_viewables.push(span_viewable);
}
}
}
}
write_spanview_document(tcx, def_id, span_viewables, w)?;
Ok(())
}
/// Generate a spanview HTML+CSS document for the given local function `def_id`, and a pre-generated
/// list `SpanViewable`s.
pub fn write_spanview_document<'tcx, W>(
tcx: TyCtxt<'tcx>,
def_id: DefId,
mut span_viewables: Vec<SpanViewable>,
w: &mut W,
) -> io::Result<()>
where
W: Write,
{
let fn_span = fn_span(tcx, def_id);
writeln!(w, "{}", HEADER)?;
let mut next_pos = fn_span.lo();
let end_pos = fn_span.hi();
let source_map = tcx.sess.source_map();
let start = source_map.lookup_char_pos(next_pos);
write!(
w,
r#"<div class="code" style="counter-reset: line {}"><span class="line">{}"#,
start.line - 1,
" ".repeat(start.col.to_usize())
)?;
span_viewables.sort_unstable_by(|a, b| {
let a = a.span;
let b = b.span;
if a.lo() == b.lo() {
// Sort hi() in reverse order so shorter spans are attempted after longer spans.
// This should give shorter spans a higher "layer", so they are not covered by
// the longer spans.
b.hi().partial_cmp(&a.hi())
} else {
a.lo().partial_cmp(&b.lo())
}
.unwrap()
});
let mut ordered_span_viewables = span_viewables.iter().peekable();
let mut alt = false;
while ordered_span_viewables.peek().is_some() {
next_pos = write_span_viewables(tcx, next_pos, &mut ordered_span_viewables, false, 1, w)?;
alt = !alt;
}
if next_pos < end_pos {
write_coverage_gap(tcx, next_pos, end_pos, w)?;
}
write!(w, r#"</span></div>"#)?;
writeln!(w, "{}", FOOTER)?;
Ok(())
}
/// Format a string showing the start line and column, and end line and column within a file.
pub fn source_range_no_file<'tcx>(tcx: TyCtxt<'tcx>, span: &Span) -> String {
let source_map = tcx.sess.source_map();
let start = source_map.lookup_char_pos(span.lo());
let end = source_map.lookup_char_pos(span.hi());
format!("{}:{}-{}:{}", start.line, start.col.to_usize() + 1, end.line, end.col.to_usize() + 1)
}
pub fn statement_kind_name(statement: &Statement<'_>) -> &'static str {
use StatementKind::*;
match statement.kind {
Assign(..) => "Assign",
FakeRead(..) => "FakeRead",
SetDiscriminant { .. } => "SetDiscriminant",
StorageLive(..) => "StorageLive",
StorageDead(..) => "StorageDead",
LlvmInlineAsm(..) => "LlvmInlineAsm",
Retag(..) => "Retag",
AscribeUserType(..) => "AscribeUserType",
Coverage(..) => "Coverage",
Nop => "Nop",
}
}
pub fn terminator_kind_name(term: &Terminator<'_>) -> &'static str {
use TerminatorKind::*;
match term.kind {
Goto { .. } => "Goto",
SwitchInt { .. } => "SwitchInt",
Resume => "Resume",
Abort => "Abort",
Return => "Return",
Unreachable => "Unreachable",
Drop { .. } => "Drop",
DropAndReplace { .. } => "DropAndReplace",
Call { .. } => "Call",
Assert { .. } => "Assert",
Yield { .. } => "Yield",
GeneratorDrop => "GeneratorDrop",
FalseEdge { .. } => "FalseEdge",
FalseUnwind { .. } => "FalseUnwind",
InlineAsm { .. } => "InlineAsm",
}
}
fn statement_span_viewable<'tcx>(
tcx: TyCtxt<'tcx>,
body_span: Span,
bb: BasicBlock,
i: usize,
statement: &Statement<'tcx>,
) -> Option<SpanViewable> {
let span = statement.source_info.span;
if !body_span.contains(span) {
return None;
}
let title = format!("bb{}[{}]", bb.index(), i);
let tooltip = tooltip(tcx, &title, span, vec![statement.clone()], &None);
Some(SpanViewable { span, title, tooltip })
}
fn terminator_span_viewable<'tcx>(
tcx: TyCtxt<'tcx>,
body_span: Span,
bb: BasicBlock,
data: &BasicBlockData<'tcx>,
) -> Option<SpanViewable> {
let term = data.terminator();
let span = term.source_info.span;
if !body_span.contains(span) {
return None;
}
let title = format!("bb{}`{}`", bb.index(), terminator_kind_name(term));
let tooltip = tooltip(tcx, &title, span, vec![], &data.terminator);
Some(SpanViewable { span, title, tooltip })
}
fn block_span_viewable<'tcx>(
tcx: TyCtxt<'tcx>,
body_span: Span,
bb: BasicBlock,
data: &BasicBlockData<'tcx>,
) -> Option<SpanViewable> {
let span = compute_block_span(data, body_span);
if !body_span.contains(span) {
return None;
}
let title = format!("bb{}", bb.index());
let tooltip = tooltip(tcx, &title, span, data.statements.clone(), &data.terminator);
Some(SpanViewable { span, title, tooltip })
}
fn compute_block_span<'tcx>(data: &BasicBlockData<'tcx>, body_span: Span) -> Span {
let mut span = data.terminator().source_info.span;
for statement_span in data.statements.iter().map(|statement| statement.source_info.span) {
// Only combine Spans from the function's body_span.
if body_span.contains(statement_span) {
span = span.to(statement_span);
}
}
span
}
/// Recursively process each ordered span. Spans that overlap will have progressively varying
/// styles, such as increased padding for each overlap. Non-overlapping adjacent spans will
/// have alternating style choices, to help distinguish between them if, visually adjacent.
/// The `layer` is incremented for each overlap, and the `alt` bool alternates between true
/// and false, for each adjacent non-overlapping span. Source code between the spans (code
/// that is not in any coverage region) has neutral styling.
fn write_span_viewables<'tcx, 'b, W>(
tcx: TyCtxt<'tcx>,
next_pos: BytePos,
ordered_span_viewables: &mut Peekable<impl Iterator<Item = &'b SpanViewable>>,
alt: bool,
layer: usize,
w: &mut W,
) -> io::Result<BytePos>
where
W: Write,
{
let span_viewable =
ordered_span_viewables.next().expect("ordered_span_viewables should have some");
if next_pos < span_viewable.span.lo() {
write_coverage_gap(tcx, next_pos, span_viewable.span.lo(), w)?;
}
let mut remaining_span = span_viewable.span;
let mut subalt = false;
loop {
let next_span_viewable = match ordered_span_viewables.peek() {
None => break,
Some(span_viewable) => *span_viewable,
};
if !next_span_viewable.span.overlaps(remaining_span) {
break;
}
write_span(
tcx,
remaining_span.until(next_span_viewable.span),
Some(span_viewable),
alt,
layer,
w,
)?;
let next_pos = write_span_viewables(
tcx,
next_span_viewable.span.lo(),
ordered_span_viewables,
subalt,
layer + 1,
w,
)?;
subalt = !subalt;
if next_pos < remaining_span.hi() {
remaining_span = remaining_span.with_lo(next_pos);
} else {
return Ok(next_pos);
}
}
write_span(tcx, remaining_span, Some(span_viewable), alt, layer, w)
}
fn write_coverage_gap<'tcx, W>(
tcx: TyCtxt<'tcx>,
lo: BytePos,
hi: BytePos,
w: &mut W,
) -> io::Result<BytePos>
where
W: Write,
{
write_span(tcx, Span::with_root_ctxt(lo, hi), None, false, 0, w)
}
fn write_span<'tcx, W>(
tcx: TyCtxt<'tcx>,
span: Span,
span_viewable: Option<&SpanViewable>,
alt: bool,
layer: usize,
w: &mut W,
) -> io::Result<BytePos>
where
W: Write,
{
let source_map = tcx.sess.source_map();
let snippet = source_map
.span_to_snippet(span)
.unwrap_or_else(|err| bug!("span_to_snippet error for span {:?}: {:?}", span, err));
let labeled_snippet = if let Some(SpanViewable { title, .. }) = span_viewable {
if span.is_empty() {
format!(r#"<span class="annotation">@{}</span>"#, title)
} else {
format!(r#"<span class="annotation">@{}:</span> {}"#, title, escape_html(&snippet))
}
} else {
snippet
};
let maybe_alt = if layer > 0 {
if alt { " odd" } else { " even" }
} else {
""
};
let maybe_tooltip = if let Some(SpanViewable { tooltip, .. }) = span_viewable {
format!(" title=\"{}\"", escape_attr(tooltip))
} else {
"".to_owned()
};
if layer == 1 {
write!(w, "<span>")?;
}
for (i, line) in labeled_snippet.lines().enumerate() {
if i > 0 {
write!(w, "{}", NEW_LINE_SPAN)?;
}
write!(
w,
r#"<span class="code{}" style="--layer: {}"{}>{}</span>"#,
maybe_alt, layer, maybe_tooltip, line
)?;
}
if layer == 1 {
write!(w, "</span>")?;
}
Ok(span.hi())
}
fn tooltip<'tcx>(
tcx: TyCtxt<'tcx>,
title: &str,
span: Span,
statements: Vec<Statement<'tcx>>,
terminator: &Option<Terminator<'tcx>>,
) -> String {
let source_map = tcx.sess.source_map();
let mut text = Vec::new();
text.push(format!("{}: {}:", title, &source_map.span_to_string(span)));
for statement in statements {
let source_range = source_range_no_file(tcx, &statement.source_info.span);
text.push(format!(
"\n{}{}: {}: {}",
TOOLTIP_INDENT,
source_range,
statement_kind_name(&statement),
format!("{:?}", statement)
));
}
if let Some(term) = terminator {
let source_range = source_range_no_file(tcx, &term.source_info.span);
text.push(format!(
"\n{}{}: {}: {:?}",
TOOLTIP_INDENT,
source_range,
terminator_kind_name(term),
term.kind
));
}
text.join("")
}
fn fn_span<'tcx>(tcx: TyCtxt<'tcx>, def_id: DefId) -> Span {
let hir_id =
tcx.hir().local_def_id_to_hir_id(def_id.as_local().expect("expected DefId is local"));
tcx.hir().span(hir_id)
}
fn hir_body<'tcx>(tcx: TyCtxt<'tcx>, def_id: DefId) -> &'tcx rustc_hir::Body<'tcx> {
let hir_node = tcx.hir().get_if_local(def_id).expect("expected DefId is local");
let fn_body_id = hir::map::associated_body(hir_node).expect("HIR node is a function with body");
tcx.hir().body(fn_body_id)
}
fn escape_html(s: &str) -> String {
s.replace("&", "&amp;").replace("<", "&lt;").replace(">", "&gt;")
}
fn escape_attr(s: &str) -> String {
s.replace("&", "&amp;")
.replace("\"", "&quot;")
.replace("'", "&#39;")
.replace("<", "&lt;")
.replace(">", "&gt;")
}

15
compiler/rustc_session/src/config.rs
View file

@ -163,6 +163,21 @@ pub enum LtoCli {
Unspecified, Unspecified,
} }
/// The different settings that the `-Z dump_mir_spanview` flag can have. `Statement` generates a
/// document highlighting each span of every statement (including terminators). `Terminator` and
/// `Block` highlight a single span per `BasicBlock`: the span of the block's `Terminator`, or a
/// computed span for the block, representing the entire range, covering the block's terminator and
/// all of its statements.
#[derive(Clone, Copy, PartialEq, Hash, Debug)]
pub enum MirSpanview {
/// Default `-Z dump_mir_spanview` or `-Z dump_mir_spanview=statement`
Statement,
/// `-Z dump_mir_spanview=terminator`
Terminator,
/// `-Z dump_mir_spanview=block`
Block,
}
#[derive(Clone, PartialEq, Hash)] #[derive(Clone, PartialEq, Hash)]
pub enum LinkerPluginLto { pub enum LinkerPluginLto {
LinkerPlugin(PathBuf), LinkerPlugin(PathBuf),

36
compiler/rustc_session/src/options.rs
View file

@ -255,6 +255,7 @@ macro_rules! options {
pub const parse_strip: &str = "either `none`, `debuginfo`, or `symbols`"; pub const parse_strip: &str = "either `none`, `debuginfo`, or `symbols`";
pub const parse_linker_flavor: &str = ::rustc_target::spec::LinkerFlavor::one_of(); pub const parse_linker_flavor: &str = ::rustc_target::spec::LinkerFlavor::one_of();
pub const parse_optimization_fuel: &str = "crate=integer"; pub const parse_optimization_fuel: &str = "crate=integer";
pub const parse_mir_spanview: &str = "`statement` (default), `terminator`, or `block`";
pub const parse_unpretty: &str = "`string` or `string=string`"; pub const parse_unpretty: &str = "`string` or `string=string`";
pub const parse_treat_err_as_bug: &str = "either no value or a number bigger than 0"; pub const parse_treat_err_as_bug: &str = "either no value or a number bigger than 0";
pub const parse_lto: &str = pub const parse_lto: &str =
@ -551,6 +552,36 @@ macro_rules! options {
} }
} }
fn parse_mir_spanview(slot: &mut Option<MirSpanview>, v: Option<&str>) -> bool {
if v.is_some() {
let mut bool_arg = None;
if parse_opt_bool(&mut bool_arg, v) {
*slot = if bool_arg.unwrap() {
Some(MirSpanview::Statement)
} else {
None
};
return true
}
}
let v = match v {
None => {
*slot = Some(MirSpanview::Statement);
return true;
}
Some(v) => v,
};
*slot = Some(match v.trim_end_matches("s") {
"statement" | "stmt" => MirSpanview::Statement,
"terminator" | "term" => MirSpanview::Terminator,
"block" | "basicblock" => MirSpanview::Block,
_ => return false,
});
true
}
fn parse_treat_err_as_bug(slot: &mut Option<usize>, v: Option<&str>) -> bool { fn parse_treat_err_as_bug(slot: &mut Option<usize>, v: Option<&str>) -> bool {
match v { match v {
Some(s) => { *slot = s.parse().ok().filter(|&x| x != 0); slot.unwrap_or(0) != 0 } Some(s) => { *slot = s.parse().ok().filter(|&x| x != 0); slot.unwrap_or(0) != 0 }
@ -849,6 +880,11 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
"exclude the pass number when dumping MIR (used in tests) (default: no)"), "exclude the pass number when dumping MIR (used in tests) (default: no)"),
dump_mir_graphviz: bool = (false, parse_bool, [UNTRACKED], dump_mir_graphviz: bool = (false, parse_bool, [UNTRACKED],
"in addition to `.mir` files, create graphviz `.dot` files (default: no)"), "in addition to `.mir` files, create graphviz `.dot` files (default: no)"),
dump_mir_spanview: Option<MirSpanview> = (None, parse_mir_spanview, [UNTRACKED],
"in addition to `.mir` files, create `.html` files to view spans for \
all `statement`s (including terminators), only `terminator` spans, or \
computed `block` spans (one span encompassing a block's terminator and \
all statements)."),
emit_stack_sizes: bool = (false, parse_bool, [UNTRACKED], emit_stack_sizes: bool = (false, parse_bool, [UNTRACKED],
"emit a section containing stack size metadata (default: no)"), "emit a section containing stack size metadata (default: no)"),
fewer_names: bool = (false, parse_bool, [TRACKED], fewer_names: bool = (false, parse_bool, [TRACKED],

5
src/test/mir-opt/spanview-block.rs Normal file
View file

@ -0,0 +1,5 @@
// Test spanview block output
// compile-flags: -Z dump-mir-spanview=block
// EMIT_MIR spanview_block.main.mir_map.0.html
fn main() {}

5
src/test/mir-opt/spanview-statement.rs Normal file
View file

@ -0,0 +1,5 @@
// Test spanview output (the default value for `-Z dump-mir-spanview` is "statement")
// compile-flags: -Z dump-mir-spanview
// EMIT_MIR spanview_statement.main.mir_map.0.html
fn main() {}

5
src/test/mir-opt/spanview-terminator.rs Normal file
View file

@ -0,0 +1,5 @@
// Test spanview terminator output
// compile-flags: -Z dump-mir-spanview=terminator
// EMIT_MIR spanview_terminator.main.mir_map.0.html
fn main() {}

67
src/test/mir-opt/spanview_block.main.mir_map.0.html Normal file
View file

@ -0,0 +1,67 @@
<!DOCTYPE html>
<html>
<head>
<title>coverage_of_if_else - Code Regions</title>
<style>
.line {
counter-increment: line;
}
.line:before {
content: counter(line) ": ";
font-family: Menlo, Monaco, monospace;
font-style: italic;
width: 3.8em;
display: inline-block;
text-align: right;
filter: opacity(50%);
-webkit-user-select: none;
}
.code {
color: #dddddd;
background-color: #222222;
font-family: Menlo, Monaco, monospace;
line-height: 1.4em;
border-bottom: 2px solid #222222;
white-space: pre;
display: inline-block;
}
.odd {
background-color: #55bbff;
color: #223311;
}
.even {
background-color: #ee7756;
color: #551133;
}
.code {
--index: calc(var(--layer) - 1);
padding-top: calc(var(--index) * 0.15em);
filter:
hue-rotate(calc(var(--index) * 25deg))
saturate(calc(100% - (var(--index) * 2%)))
brightness(calc(100% - (var(--index) * 1.5%)));
}
.annotation {
color: #4444ff;
font-family: monospace;
font-style: italic;
display: none;
-webkit-user-select: none;
}
body:active .annotation {
/* requires holding mouse down anywhere on the page */
display: inline-block;
}
span:hover .annotation {
/* requires hover over a span ONLY on its first line */
display: inline-block;
}
</style>
</head>
<body>
<div class="code" style="counter-reset: line 4"><span class="line"><span class="code" style="--layer: 0">fn main() </span><span><span class="code even" style="--layer: 1" title="bb0: $DIR/spanview-block.rs:5:11: 5:13:
5:11-5:13: Assign: _0 = const ()
5:13-5:13: Goto: goto -&gt; bb2"><span class="annotation">@bb0:</span> {}</span></span><span><span class="code even" style="--layer: 1" title="bb2: $DIR/spanview-block.rs:5:13: 5:13:
5:13-5:13: Return: return"><span class="annotation">@bb2</span></span></span></span></div>
</body>
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<!DOCTYPE html>
<html>
<head>
<title>coverage_of_if_else - Code Regions</title>
<style>
.line {
counter-increment: line;
}
.line:before {
content: counter(line) ": ";
font-family: Menlo, Monaco, monospace;
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.code {
color: #dddddd;
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padding-top: calc(var(--index) * 0.15em);
filter:
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saturate(calc(100% - (var(--index) * 2%)))
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.annotation {
color: #4444ff;
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font-style: italic;
display: none;
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body:active .annotation {
/* requires holding mouse down anywhere on the page */
display: inline-block;
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span:hover .annotation {
/* requires hover over a span ONLY on its first line */
display: inline-block;
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</head>
<body>
<div class="code" style="counter-reset: line 4"><span class="line"><span class="code" style="--layer: 0">fn main() </span><span><span class="code even" style="--layer: 1" title="bb0[0]: $DIR/spanview-statement.rs:5:11: 5:13:
5:11-5:13: Assign: _0 = const ()"><span class="annotation">@bb0[0]:</span> {}</span></span><span><span class="code even" style="--layer: 1" title="bb0`Goto`: $DIR/spanview-statement.rs:5:13: 5:13:
5:13-5:13: Goto: goto -&gt; bb2"><span class="annotation">@bb0`Goto`</span></span></span><span><span class="code even" style="--layer: 1" title="bb2`Return`: $DIR/spanview-statement.rs:5:13: 5:13:
5:13-5:13: Return: return"><span class="annotation">@bb2`Return`</span></span></span></span></div>
</body>
</html>

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<!DOCTYPE html>
<html>
<head>
<title>coverage_of_if_else - Code Regions</title>
<style>
.line {
counter-increment: line;
}
.line:before {
content: counter(line) ": ";
font-family: Menlo, Monaco, monospace;
font-style: italic;
width: 3.8em;
display: inline-block;
text-align: right;
filter: opacity(50%);
-webkit-user-select: none;
}
.code {
color: #dddddd;
background-color: #222222;
font-family: Menlo, Monaco, monospace;
line-height: 1.4em;
border-bottom: 2px solid #222222;
white-space: pre;
display: inline-block;
}
.odd {
background-color: #55bbff;
color: #223311;
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.even {
background-color: #ee7756;
color: #551133;
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.code {
--index: calc(var(--layer) - 1);
padding-top: calc(var(--index) * 0.15em);
filter:
hue-rotate(calc(var(--index) * 25deg))
saturate(calc(100% - (var(--index) * 2%)))
brightness(calc(100% - (var(--index) * 1.5%)));
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.annotation {
color: #4444ff;
font-family: monospace;
font-style: italic;
display: none;
-webkit-user-select: none;
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body:active .annotation {
/* requires holding mouse down anywhere on the page */
display: inline-block;
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span:hover .annotation {
/* requires hover over a span ONLY on its first line */
display: inline-block;
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</style>
</head>
<body>
<div class="code" style="counter-reset: line 4"><span class="line"><span class="code" style="--layer: 0">fn main() {}</span><span><span class="code even" style="--layer: 1" title="bb0`Goto`: $DIR/spanview-terminator.rs:5:13: 5:13:
5:13-5:13: Goto: goto -&gt; bb2"><span class="annotation">@bb0`Goto`</span></span></span><span><span class="code even" style="--layer: 1" title="bb2`Return`: $DIR/spanview-terminator.rs:5:13: 5:13:
5:13-5:13: Return: return"><span class="annotation">@bb2`Return`</span></span></span></span></div>
</body>
</html>