[Bug rust/21483] New: Rust expression evaluation can be really expensive

["jrmuizel at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

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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