Rollup merge of #92924 - dtolnay:pptracing, r=Mark-Simulacrum

Delete pretty printer tracing

These are left over from 2011. I did not find these helpful at all in my work on https://github.com/dtolnay/prettyplease despite doing significant refactors to this code. Learning what these messages all refer to is harder than putting in your own messages to log exactly what is relevant to specifically the thing that you are working on debugging.

Cargo.lock

@@ -3433,7 +3433,6 @@ version = "0.0.0"
 dependencies = [
  "rustc_ast",
  "rustc_span",
- "tracing",
 ]
 
 [[package]]

compiler/rustc_ast_pretty/Cargo.toml

@@ -7,6 +7,5 @@ edition = "2021"
 doctest = false
 
 [dependencies]
-tracing = "0.1"
 rustc_span = { path = "../rustc_span" }
 rustc_ast = { path = "../rustc_ast" }

compiler/rustc_ast_pretty/src/pp.rs

@@ -138,7 +138,6 @@
 use std::borrow::Cow;
 use std::collections::VecDeque;
 use std::fmt;
-use tracing::debug;
 
 /// How to break. Described in more detail in the module docs.
 #[derive(Clone, Copy, PartialEq)]
@@ -193,22 +192,6 @@ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
     }
 }
 
-fn buf_str(buf: &RingBuffer<BufEntry>, left: usize, right: usize, lim: usize) -> String {
-    let mut i = left;
-    let mut l = lim;
-    let mut s = String::from("[");
-    while i != right && l != 0 {
-        l -= 1;
-        if i != left {
-            s.push_str(", ");
-        }
-        s.push_str(&format!("{}={}", buf[i].size, &buf[i].token));
-        i += 1;
-    }
-    s.push(']');
-    s
-}
-
 #[derive(Copy, Clone)]
 enum PrintStackBreak {
     Fits,
@@ -267,7 +250,6 @@ fn default() -> Self {
 impl Printer {
     pub fn new() -> Self {
         let linewidth = 78;
-        debug!("Printer::new {}", linewidth);
         let mut buf = RingBuffer::new();
         buf.advance_right();
         Printer {
@@ -310,16 +292,13 @@ fn scan_begin(&mut self, b: BeginToken) {
         } else {
             self.advance_right();
         }
-        debug!("pp Begin({})/buffer Vec<{},{}>", b.offset, self.left, self.right);
         self.scan_push(BufEntry { token: Token::Begin(b), size: -self.right_total });
     }
 
     fn scan_end(&mut self) {
         if self.scan_stack.is_empty() {
-            debug!("pp End/print Vec<{},{}>", self.left, self.right);
             self.print_end();
         } else {
-            debug!("pp End/buffer Vec<{},{}>", self.left, self.right);
             self.advance_right();
             self.scan_push(BufEntry { token: Token::End, size: -1 });
         }
@@ -334,7 +313,6 @@ fn scan_break(&mut self, b: BreakToken) {
         } else {
             self.advance_right();
         }
-        debug!("pp Break({})/buffer Vec<{},{}>", b.offset, self.left, self.right);
         self.check_stack(0);
         self.scan_push(BufEntry { token: Token::Break(b), size: -self.right_total });
         self.right_total += b.blank_space;
@@ -342,10 +320,8 @@ fn scan_break(&mut self, b: BreakToken) {
 
     fn scan_string(&mut self, s: Cow<'static, str>) {
         if self.scan_stack.is_empty() {
-            debug!("pp String('{}')/print Vec<{},{}>", s, self.left, self.right);
             self.print_string(s);
         } else {
-            debug!("pp String('{}')/buffer Vec<{},{}>", s, self.left, self.right);
             self.advance_right();
             let len = s.len() as isize;
             self.buf[self.right] = BufEntry { token: Token::String(s), size: len };
@@ -355,18 +331,8 @@ fn scan_string(&mut self, s: Cow<'static, str>) {
     }
 
     fn check_stream(&mut self) {
-        debug!(
-            "check_stream Vec<{}, {}> with left_total={}, right_total={}",
-            self.left, self.right, self.left_total, self.right_total
-        );
         if self.right_total - self.left_total > self.space {
-            debug!(
-                "scan window is {}, longer than space on line ({})",
-                self.right_total - self.left_total,
-                self.space
-            );
             if Some(&self.left) == self.scan_stack.back() {
-                debug!("setting {} to infinity and popping", self.left);
                 let scanned = self.scan_pop_bottom();
                 self.buf[scanned].size = SIZE_INFINITY;
             }
@@ -378,7 +344,6 @@ fn check_stream(&mut self) {
     }
 
     fn scan_push(&mut self, entry: BufEntry) {
-        debug!("scan_push {}", self.right);
         self.buf[self.right] = entry;
         self.scan_stack.push_front(self.right);
     }
@@ -401,11 +366,6 @@ fn advance_right(&mut self) {
     }
 
     fn advance_left(&mut self) {
-        debug!(
-            "advance_left Vec<{},{}>, sizeof({})={}",
-            self.left, self.right, self.left, self.buf[self.left].size
-        );
-
         let mut left_size = self.buf[self.left].size;
 
         while left_size >= 0 {
@@ -465,14 +425,12 @@ fn check_stack(&mut self, k: usize) {
     }
 
     fn print_newline(&mut self, amount: isize) {
-        debug!("NEWLINE {}", amount);
         self.out.push('\n');
         self.pending_indentation = 0;
         self.indent(amount);
     }
 
     fn indent(&mut self, amount: isize) {
-        debug!("INDENT {}", amount);
         self.pending_indentation += amount;
     }
 
@@ -485,17 +443,14 @@ fn get_top(&self) -> PrintStackElem {
     fn print_begin(&mut self, b: BeginToken, l: isize) {
         if l > self.space {
             let col = self.margin - self.space + b.offset;
-            debug!("print Begin -> push broken block at col {}", col);
             self.print_stack
                 .push(PrintStackElem { offset: col, pbreak: PrintStackBreak::Broken(b.breaks) });
         } else {
-            debug!("print Begin -> push fitting block");
             self.print_stack.push(PrintStackElem { offset: 0, pbreak: PrintStackBreak::Fits });
         }
     }
 
     fn print_end(&mut self) {
-        debug!("print End -> pop End");
         self.print_stack.pop().unwrap();
     }
 
@@ -503,22 +458,18 @@ fn print_break(&mut self, b: BreakToken, l: isize) {
         let top = self.get_top();
         match top.pbreak {
             PrintStackBreak::Fits => {
-                debug!("print Break({}) in fitting block", b.blank_space);
                 self.space -= b.blank_space;
                 self.indent(b.blank_space);
             }
             PrintStackBreak::Broken(Breaks::Consistent) => {
-                debug!("print Break({}+{}) in consistent block", top.offset, b.offset);
                 self.print_newline(top.offset + b.offset);
                 self.space = self.margin - (top.offset + b.offset);
             }
             PrintStackBreak::Broken(Breaks::Inconsistent) => {
                 if l > self.space {
-                    debug!("print Break({}+{}) w/ newline in inconsistent", top.offset, b.offset);
                     self.print_newline(top.offset + b.offset);
                     self.space = self.margin - (top.offset + b.offset);
                 } else {
-                    debug!("print Break({}) w/o newline in inconsistent", b.blank_space);
                     self.indent(b.blank_space);
                     self.space -= b.blank_space;
                 }
@@ -528,7 +479,6 @@ fn print_break(&mut self, b: BreakToken, l: isize) {
 
     fn print_string(&mut self, s: Cow<'static, str>) {
         let len = s.len() as isize;
-        debug!("print String({})", s);
         // assert!(len <= space);
         self.space -= len;
 
@@ -545,8 +495,6 @@ fn print_string(&mut self, s: Cow<'static, str>) {
     }
 
     fn print(&mut self, token: Token, l: isize) {
-        debug!("print {} {} (remaining line space={})", token, l, self.space);
-        debug!("{}", buf_str(&self.buf, self.left, self.right, 6));
         match token {
             Token::Begin(b) => self.print_begin(b, l),
             Token::End => self.print_end(),