[Bug rust/21483] New: Rust expression evaluation can be really expensive
jrmuizel at gmail dot com
sourceware-bugzilla@sourceware.org
Thu May 11 18:04:00 GMT 2017
https://sourceware.org/bugzilla/show_bug.cgi?id=21483
Bug ID: 21483
Summary: Rust expression evaluation can be really expensive
Product: gdb
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: rust
Assignee: unassigned at sourceware dot org
Reporter: jrmuizel at gmail dot com
Target Milestone: ---
STR:
$ git clone https://github.com/servo/webrender
$ cd webrender/wrench
$ cargo build --release
$ gdb --args ../target/release/wrench show reftests/text/text.yaml
(gdb) rb Renderer::render
(gdb) r
Thread 1 "wrench" hit Breakpoint 2, webrender::renderer::Renderer::render
(self=0x7fffffff9298, framebuffer_size=...)
at /home/jrmuizel/src/webrender/webrender/src/renderer.rs:1251
1251 pub fn render(&mut self, framebuffer_size: DeviceUintSize) {
(gdb) c
Thread 1 "wrench" hit Breakpoint 2, webrender::renderer::Renderer::render
(self=0x7fffffff9298, framebuffer_size=...)
at /home/jrmuizel/src/webrender/webrender/src/renderer.rs:1251
1251 pub fn render(&mut self, framebuffer_size: DeviceUintSize) {
(gdb) p
self.current_frame.0.frame.0.passes.buf.ptr.pointer.0[0].color_targets.targets.buf.ptr.pointer.0[0].alpha_batcher.tasks.buf.ptr.pointer.0[0].items.buf.ptr
rust_evaluate_subexp is called roughly 760939 times to evaluate this expression
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