1 files changed, 807 insertions, 0 deletions
diff --git a/vendor/gimli/benches/bench.rs b/vendor/gimli/benches/bench.rs
new file mode 100644
index 000000000..fb29df77c
--- /dev/null
+++ b/vendor/gimli/benches/bench.rs
@@ -0,0 +1,807 @@
+#![feature(test)]
+
+extern crate test;
+
+use gimli::{
+    AttributeValue, DebugAbbrev, DebugAddr, DebugAddrBase, DebugAranges, DebugInfo, DebugLine,
+    DebugLineOffset, DebugLoc, DebugLocLists, DebugPubNames, DebugPubTypes, DebugRanges,
+    DebugRngLists, Encoding, EndianSlice, EntriesTreeNode, Expression, LittleEndian, LocationLists,
+    Operation, RangeLists, RangeListsOffset, Reader, ReaderOffset,
+};
+use std::env;
+use std::fs::File;
+use std::io::Read;
+use std::path::PathBuf;
+use std::rc::Rc;
+
+pub fn read_section(section: &str) -> Vec<u8> {
+    let mut path = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap_or_else(|_| ".".into()));
+    path.push("./fixtures/self/");
+    path.push(section);
+
+    assert!(path.is_file());
+    let mut file = File::open(path).unwrap();
+
+    let mut buf = Vec::new();
+    file.read_to_end(&mut buf).unwrap();
+    buf
+}
+
+#[bench]
+fn bench_parsing_debug_abbrev(b: &mut test::Bencher) {
+    let debug_info = read_section("debug_info");
+    let debug_info = DebugInfo::new(&debug_info, LittleEndian);
+    let unit = debug_info
+        .units()
+        .next()
+        .expect("Should have at least one compilation unit")
+        .expect("And it should parse OK");
+
+    let debug_abbrev = read_section("debug_abbrev");
+
+    b.iter(|| {
+        let debug_abbrev = DebugAbbrev::new(&debug_abbrev, LittleEndian);
+        test::black_box(
+            unit.abbreviations(&debug_abbrev)
+                .expect("Should parse abbreviations"),
+        );
+    });
+}
+
+#[inline]
+fn impl_bench_parsing_debug_info<R: Reader>(
+    debug_info: DebugInfo<R>,
+    debug_abbrev: DebugAbbrev<R>,
+) {
+    let mut iter = debug_info.units();
+    while let Some(unit) = iter.next().expect("Should parse compilation unit") {
+        let abbrevs = unit
+            .abbreviations(&debug_abbrev)
+            .expect("Should parse abbreviations");
+
+        let mut cursor = unit.entries(&abbrevs);
+        while let Some((_, entry)) = cursor.next_dfs().expect("Should parse next dfs") {
+            let mut attrs = entry.attrs();
+            loop {
+                match attrs.next() {
+                    Ok(Some(ref attr)) => {
+                        test::black_box(attr);
+                    }
+                    Ok(None) => break,
+                    e @ Err(_) => {
+                        e.expect("Should parse entry's attribute");
+                    }
+                }
+            }
+        }
+    }
+}
+
+#[bench]
+fn bench_parsing_debug_info(b: &mut test::Bencher) {
+    let debug_info = read_section("debug_info");
+    let debug_info = DebugInfo::new(&debug_info, LittleEndian);
+
+    let debug_abbrev = read_section("debug_abbrev");
+    let debug_abbrev = DebugAbbrev::new(&debug_abbrev, LittleEndian);
+
+    b.iter(|| impl_bench_parsing_debug_info(debug_info, debug_abbrev));
+}
+
+#[bench]
+fn bench_parsing_debug_info_with_endian_rc_slice(b: &mut test::Bencher) {
+    let debug_info = read_section("debug_info");
+    let debug_info = Rc::from(&debug_info[..]);
+    let debug_info = gimli::EndianRcSlice::new(debug_info, LittleEndian);
+    let debug_info = DebugInfo::from(debug_info);
+
+    let debug_abbrev = read_section("debug_abbrev");
+    let debug_abbrev = Rc::from(&debug_abbrev[..]);
+    let debug_abbrev = gimli::EndianRcSlice::new(debug_abbrev, LittleEndian);
+    let debug_abbrev = DebugAbbrev::from(debug_abbrev);
+
+    b.iter(|| impl_bench_parsing_debug_info(debug_info.clone(), debug_abbrev.clone()));
+}
+
+#[bench]
+fn bench_parsing_debug_info_tree(b: &mut test::Bencher) {
+    let debug_abbrev = read_section("debug_abbrev");
+    let debug_abbrev = DebugAbbrev::new(&debug_abbrev, LittleEndian);
+
+    let debug_info = read_section("debug_info");
+
+    b.iter(|| {
+        let debug_info = DebugInfo::new(&debug_info, LittleEndian);
+
+        let mut iter = debug_info.units();
+        while let Some(unit) = iter.next().expect("Should parse compilation unit") {
+            let abbrevs = unit
+                .abbreviations(&debug_abbrev)
+                .expect("Should parse abbreviations");
+
+            let mut tree = unit
+                .entries_tree(&abbrevs, None)
+                .expect("Should have entries tree");
+            let root = tree.root().expect("Should parse root entry");
+            parse_debug_info_tree(root);
+        }
+    });
+}
+
+fn parse_debug_info_tree<R: Reader>(node: EntriesTreeNode<R>) {
+    {
+        let mut attrs = node.entry().attrs();
+        loop {
+            match attrs.next() {
+                Ok(Some(ref attr)) => {
+                    test::black_box(attr);
+                }
+                Ok(None) => break,
+                e @ Err(_) => {
+                    e.expect("Should parse entry's attribute");
+                }
+            }
+        }
+    }
+    let mut children = node.children();
+    while let Some(child) = children.next().expect("Should parse child entry") {
+        parse_debug_info_tree(child);
+    }
+}
+
+#[bench]
+fn bench_parsing_debug_info_raw(b: &mut test::Bencher) {
+    let debug_abbrev = read_section("debug_abbrev");
+    let debug_abbrev = DebugAbbrev::new(&debug_abbrev, LittleEndian);
+
+    let debug_info = read_section("debug_info");
+
+    b.iter(|| {
+        let debug_info = DebugInfo::new(&debug_info, LittleEndian);
+
+        let mut iter = debug_info.units();
+        while let Some(unit) = iter.next().expect("Should parse compilation unit") {
+            let abbrevs = unit
+                .abbreviations(&debug_abbrev)
+                .expect("Should parse abbreviations");
+
+            let mut raw = unit
+                .entries_raw(&abbrevs, None)
+                .expect("Should have entries");
+            while !raw.is_empty() {
+                if let Some(abbrev) = raw
+                    .read_abbreviation()
+                    .expect("Should parse abbreviation code")
+                {
+                    for spec in abbrev.attributes().iter().cloned() {
+                        match raw.read_attribute(spec) {
+                            Ok(ref attr) => {
+                                test::black_box(attr);
+                            }
+                            e @ Err(_) => {
+                                e.expect("Should parse attribute");
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    });
+}
+
+#[bench]
+fn bench_parsing_debug_aranges(b: &mut test::Bencher) {
+    let debug_aranges = read_section("debug_aranges");
+    let debug_aranges = DebugAranges::new(&debug_aranges, LittleEndian);
+
+    b.iter(|| {
+        let mut headers = debug_aranges.headers();
+        while let Some(header) = headers.next().expect("Should parse arange header OK") {
+            let mut entries = header.entries();
+            while let Some(arange) = entries.next().expect("Should parse arange entry OK") {
+                test::black_box(arange);
+            }
+        }
+    });
+}
+
+#[bench]
+fn bench_parsing_debug_pubnames(b: &mut test::Bencher) {
+    let debug_pubnames = read_section("debug_pubnames");
+    let debug_pubnames = DebugPubNames::new(&debug_pubnames, LittleEndian);
+
+    b.iter(|| {
+        let mut pubnames = debug_pubnames.items();
+        while let Some(pubname) = pubnames.next().expect("Should parse pubname OK") {
+            test::black_box(pubname);
+        }
+    });
+}
+
+#[bench]
+fn bench_parsing_debug_pubtypes(b: &mut test::Bencher) {
+    let debug_pubtypes = read_section("debug_pubtypes");
+    let debug_pubtypes = DebugPubTypes::new(&debug_pubtypes, LittleEndian);
+
+    b.iter(|| {
+        let mut pubtypes = debug_pubtypes.items();
+        while let Some(pubtype) = pubtypes.next().expect("Should parse pubtype OK") {
+            test::black_box(pubtype);
+        }
+    });
+}
+
+// We happen to know that there is a line number program and header at
+// offset 0 and that address size is 8 bytes. No need to parse DIEs to grab
+// this info off of the compilation units.
+const OFFSET: DebugLineOffset = DebugLineOffset(0);
+const ADDRESS_SIZE: u8 = 8;
+
+#[bench]
+fn bench_parsing_line_number_program_opcodes(b: &mut test::Bencher) {
+    let debug_line = read_section("debug_line");
+    let debug_line = DebugLine::new(&debug_line, LittleEndian);
+
+    b.iter(|| {
+        let program = debug_line
+            .program(OFFSET, ADDRESS_SIZE, None, None)
+            .expect("Should parse line number program header");
+        let header = program.header();
+
+        let mut instructions = header.instructions();
+        while let Some(instruction) = instructions
+            .next_instruction(header)
+            .expect("Should parse instruction")
+        {
+            test::black_box(instruction);
+        }
+    });
+}
+
+#[bench]
+fn bench_executing_line_number_programs(b: &mut test::Bencher) {
+    let debug_line = read_section("debug_line");
+    let debug_line = DebugLine::new(&debug_line, LittleEndian);
+
+    b.iter(|| {
+        let program = debug_line
+            .program(OFFSET, ADDRESS_SIZE, None, None)
+            .expect("Should parse line number program header");
+
+        let mut rows = program.rows();
+        while let Some(row) = rows
+            .next_row()
+            .expect("Should parse and execute all rows in the line number program")
+        {
+            test::black_box(row);
+        }
+    });
+}
+
+#[bench]
+fn bench_parsing_debug_loc(b: &mut test::Bencher) {
+    let debug_info = read_section("debug_info");
+    let debug_info = DebugInfo::new(&debug_info, LittleEndian);
+
+    let debug_abbrev = read_section("debug_abbrev");
+    let debug_abbrev = DebugAbbrev::new(&debug_abbrev, LittleEndian);
+
+    let debug_addr = DebugAddr::from(EndianSlice::new(&[], LittleEndian));
+    let debug_addr_base = DebugAddrBase(0);
+
+    let debug_loc = read_section("debug_loc");
+    let debug_loc = DebugLoc::new(&debug_loc, LittleEndian);
+    let debug_loclists = DebugLocLists::new(&[], LittleEndian);
+    let loclists = LocationLists::new(debug_loc, debug_loclists);
+
+    let mut offsets = Vec::new();
+
+    let mut iter = debug_info.units();
+    while let Some(unit) = iter.next().expect("Should parse compilation unit") {
+        let abbrevs = unit
+            .abbreviations(&debug_abbrev)
+            .expect("Should parse abbreviations");
+
+        let mut cursor = unit.entries(&abbrevs);
+        cursor.next_dfs().expect("Should parse next dfs");
+
+        let mut low_pc = 0;
+
+        {
+            let unit_entry = cursor.current().expect("Should have a root entry");
+            let low_pc_attr = unit_entry
+                .attr_value(gimli::DW_AT_low_pc)
+                .expect("Should parse low_pc");
+            if let Some(gimli::AttributeValue::Addr(address)) = low_pc_attr {
+                low_pc = address;
+            }
+        }
+
+        while cursor.next_dfs().expect("Should parse next dfs").is_some() {
+            let entry = cursor.current().expect("Should have a current entry");
+            let mut attrs = entry.attrs();
+            while let Some(attr) = attrs.next().expect("Should parse entry's attribute") {
+                if let gimli::AttributeValue::LocationListsRef(offset) = attr.value() {
+                    offsets.push((offset, unit.encoding(), low_pc));
+                }
+            }
+        }
+    }
+
+    b.iter(|| {
+        for &(offset, encoding, base_address) in &*offsets {
+            let mut locs = loclists
+                .locations(offset, encoding, base_address, &debug_addr, debug_addr_base)
+                .expect("Should parse locations OK");
+            while let Some(loc) = locs.next().expect("Should parse next location") {
+                test::black_box(loc);
+            }
+        }
+    });
+}
+
+#[bench]
+fn bench_parsing_debug_ranges(b: &mut test::Bencher) {
+    let debug_info = read_section("debug_info");
+    let debug_info = DebugInfo::new(&debug_info, LittleEndian);
+
+    let debug_abbrev = read_section("debug_abbrev");
+    let debug_abbrev = DebugAbbrev::new(&debug_abbrev, LittleEndian);
+
+    let debug_addr = DebugAddr::from(EndianSlice::new(&[], LittleEndian));
+    let debug_addr_base = DebugAddrBase(0);
+
+    let debug_ranges = read_section("debug_ranges");
+    let debug_ranges = DebugRanges::new(&debug_ranges, LittleEndian);
+    let debug_rnglists = DebugRngLists::new(&[], LittleEndian);
+    let rnglists = RangeLists::new(debug_ranges, debug_rnglists);
+
+    let mut offsets = Vec::new();
+
+    let mut iter = debug_info.units();
+    while let Some(unit) = iter.next().expect("Should parse compilation unit") {
+        let abbrevs = unit
+            .abbreviations(&debug_abbrev)
+            .expect("Should parse abbreviations");
+
+        let mut cursor = unit.entries(&abbrevs);
+        cursor.next_dfs().expect("Should parse next dfs");
+
+        let mut low_pc = 0;
+
+        {
+            let unit_entry = cursor.current().expect("Should have a root entry");
+            let low_pc_attr = unit_entry
+                .attr_value(gimli::DW_AT_low_pc)
+                .expect("Should parse low_pc");
+            if let Some(gimli::AttributeValue::Addr(address)) = low_pc_attr {
+                low_pc = address;
+            }
+        }
+
+        while cursor.next_dfs().expect("Should parse next dfs").is_some() {
+            let entry = cursor.current().expect("Should have a current entry");
+            let mut attrs = entry.attrs();
+            while let Some(attr) = attrs.next().expect("Should parse entry's attribute") {
+                if let gimli::AttributeValue::RangeListsRef(offset) = attr.value() {
+                    offsets.push((RangeListsOffset(offset.0), unit.encoding(), low_pc));
+                }
+            }
+        }
+    }
+
+    b.iter(|| {
+        for &(offset, encoding, base_address) in &*offsets {
+            let mut ranges = rnglists
+                .ranges(offset, encoding, base_address, &debug_addr, debug_addr_base)
+                .expect("Should parse ranges OK");
+            while let Some(range) = ranges.next().expect("Should parse next range") {
+                test::black_box(range);
+            }
+        }
+    });
+}
+
+fn debug_info_expressions<R: Reader>(
+    debug_info: &DebugInfo<R>,
+    debug_abbrev: &DebugAbbrev<R>,
+) -> Vec<(Expression<R>, Encoding)> {
+    let mut expressions = Vec::new();
+
+    let mut iter = debug_info.units();
+    while let Some(unit) = iter.next().expect("Should parse compilation unit") {
+        let abbrevs = unit
+            .abbreviations(debug_abbrev)
+            .expect("Should parse abbreviations");
+
+        let mut cursor = unit.entries(&abbrevs);
+        while let Some((_, entry)) = cursor.next_dfs().expect("Should parse next dfs") {
+            let mut attrs = entry.attrs();
+            while let Some(attr) = attrs.next().expect("Should parse entry's attribute") {
+                if let AttributeValue::Exprloc(expression) = attr.value() {
+                    expressions.push((expression, unit.encoding()));
+                }
+            }
+        }
+    }
+
+    expressions
+}
+
+#[bench]
+fn bench_parsing_debug_info_expressions(b: &mut test::Bencher) {
+    let debug_abbrev = read_section("debug_abbrev");
+    let debug_abbrev = DebugAbbrev::new(&debug_abbrev, LittleEndian);
+
+    let debug_info = read_section("debug_info");
+    let debug_info = DebugInfo::new(&debug_info, LittleEndian);
+
+    let expressions = debug_info_expressions(&debug_info, &debug_abbrev);
+
+    b.iter(|| {
+        for &(expression, encoding) in &*expressions {
+            let mut pc = expression.0;
+            while !pc.is_empty() {
+                Operation::parse(&mut pc, encoding).expect("Should parse operation");
+            }
+        }
+    });
+}
+
+#[bench]
+fn bench_evaluating_debug_info_expressions(b: &mut test::Bencher) {
+    let debug_abbrev = read_section("debug_abbrev");
+    let debug_abbrev = DebugAbbrev::new(&debug_abbrev, LittleEndian);
+
+    let debug_info = read_section("debug_info");
+    let debug_info = DebugInfo::new(&debug_info, LittleEndian);
+
+    let expressions = debug_info_expressions(&debug_info, &debug_abbrev);
+
+    b.iter(|| {
+        for &(expression, encoding) in &*expressions {
+            let mut eval = expression.evaluation(encoding);
+            eval.set_initial_value(0);
+            let result = eval.evaluate().expect("Should evaluate expression");
+            test::black_box(result);
+        }
+    });
+}
+
+fn debug_loc_expressions<R: Reader>(
+    debug_info: &DebugInfo<R>,
+    debug_abbrev: &DebugAbbrev<R>,
+    debug_addr: &DebugAddr<R>,
+    loclists: &LocationLists<R>,
+) -> Vec<(Expression<R>, Encoding)> {
+    let debug_addr_base = DebugAddrBase(R::Offset::from_u8(0));
+
+    let mut expressions = Vec::new();
+
+    let mut iter = debug_info.units();
+    while let Some(unit) = iter.next().expect("Should parse compilation unit") {
+        let abbrevs = unit
+            .abbreviations(debug_abbrev)
+            .expect("Should parse abbreviations");
+
+        let mut cursor = unit.entries(&abbrevs);
+        cursor.next_dfs().expect("Should parse next dfs");
+
+        let mut low_pc = 0;
+
+        {
+            let unit_entry = cursor.current().expect("Should have a root entry");
+            let low_pc_attr = unit_entry
+                .attr_value(gimli::DW_AT_low_pc)
+                .expect("Should parse low_pc");
+            if let Some(gimli::AttributeValue::Addr(address)) = low_pc_attr {
+                low_pc = address;
+            }
+        }
+
+        while cursor.next_dfs().expect("Should parse next dfs").is_some() {
+            let entry = cursor.current().expect("Should have a current entry");
+            let mut attrs = entry.attrs();
+            while let Some(attr) = attrs.next().expect("Should parse entry's attribute") {
+                if let gimli::AttributeValue::LocationListsRef(offset) = attr.value() {
+                    let mut locs = loclists
+                        .locations(offset, unit.encoding(), low_pc, debug_addr, debug_addr_base)
+                        .expect("Should parse locations OK");
+                    while let Some(loc) = locs.next().expect("Should parse next location") {
+                        expressions.push((loc.data, unit.encoding()));
+                    }
+                }
+            }
+        }
+    }
+
+    expressions
+}
+
+#[bench]
+fn bench_parsing_debug_loc_expressions(b: &mut test::Bencher) {
+    let debug_info = read_section("debug_info");
+    let debug_info = DebugInfo::new(&debug_info, LittleEndian);
+
+    let debug_abbrev = read_section("debug_abbrev");
+    let debug_abbrev = DebugAbbrev::new(&debug_abbrev, LittleEndian);
+
+    let debug_addr = DebugAddr::from(EndianSlice::new(&[], LittleEndian));
+
+    let debug_loc = read_section("debug_loc");
+    let debug_loc = DebugLoc::new(&debug_loc, LittleEndian);
+    let debug_loclists = DebugLocLists::new(&[], LittleEndian);
+    let loclists = LocationLists::new(debug_loc, debug_loclists);
+
+    let expressions = debug_loc_expressions(&debug_info, &debug_abbrev, &debug_addr, &loclists);
+
+    b.iter(|| {
+        for &(expression, encoding) in &*expressions {
+            let mut pc = expression.0;
+            while !pc.is_empty() {
+                Operation::parse(&mut pc, encoding).expect("Should parse operation");
+            }
+        }
+    });
+}
+
+#[bench]
+fn bench_evaluating_debug_loc_expressions(b: &mut test::Bencher) {
+    let debug_info = read_section("debug_info");
+    let debug_info = DebugInfo::new(&debug_info, LittleEndian);
+
+    let debug_abbrev = read_section("debug_abbrev");
+    let debug_abbrev = DebugAbbrev::new(&debug_abbrev, LittleEndian);
+
+    let debug_addr = DebugAddr::from(EndianSlice::new(&[], LittleEndian));
+
+    let debug_loc = read_section("debug_loc");
+    let debug_loc = DebugLoc::new(&debug_loc, LittleEndian);
+    let debug_loclists = DebugLocLists::new(&[], LittleEndian);
+    let loclists = LocationLists::new(debug_loc, debug_loclists);
+
+    let expressions = debug_loc_expressions(&debug_info, &debug_abbrev, &debug_addr, &loclists);
+
+    b.iter(|| {
+        for &(expression, encoding) in &*expressions {
+            let mut eval = expression.evaluation(encoding);
+            eval.set_initial_value(0);
+            let result = eval.evaluate().expect("Should evaluate expression");
+            test::black_box(result);
+        }
+    });
+}
+
+// See comment above `test_parse_self_eh_frame`.
+#[cfg(target_pointer_width = "64")]
+mod cfi {
+    use super::*;
+    use fallible_iterator::FallibleIterator;
+
+    use gimli::{
+        BaseAddresses, CieOrFde, EhFrame, FrameDescriptionEntry, LittleEndian, UnwindContext,
+        UnwindSection,
+    };
+
+    #[bench]
+    fn iterate_entries_and_do_not_parse_any_fde(b: &mut test::Bencher) {
+        let eh_frame = read_section("eh_frame");
+        let eh_frame = EhFrame::new(&eh_frame, LittleEndian);
+
+        let bases = BaseAddresses::default()
+            .set_eh_frame(0)
+            .set_got(0)
+            .set_text(0);
+
+        b.iter(|| {
+            let mut entries = eh_frame.entries(&bases);
+            while let Some(entry) = entries.next().expect("Should parse CFI entry OK") {
+                test::black_box(entry);
+            }
+        });
+    }
+
+    #[bench]
+    fn iterate_entries_and_parse_every_fde(b: &mut test::Bencher) {
+        let eh_frame = read_section("eh_frame");
+        let eh_frame = EhFrame::new(&eh_frame, LittleEndian);
+
+        let bases = BaseAddresses::default()
+            .set_eh_frame(0)
+            .set_got(0)
+            .set_text(0);
+
+        b.iter(|| {
+            let mut entries = eh_frame.entries(&bases);
+            while let Some(entry) = entries.next().expect("Should parse CFI entry OK") {
+                match entry {
+                    CieOrFde::Cie(cie) => {
+                        test::black_box(cie);
+                    }
+                    CieOrFde::Fde(partial) => {
+                        let fde = partial
+                            .parse(EhFrame::cie_from_offset)
+                            .expect("Should be able to get CIE for FED");
+                        test::black_box(fde);
+                    }
+                };
+            }
+        });
+    }
+
+    #[bench]
+    fn iterate_entries_and_parse_every_fde_and_instructions(b: &mut test::Bencher) {
+        let eh_frame = read_section("eh_frame");
+        let eh_frame = EhFrame::new(&eh_frame, LittleEndian);
+
+        let bases = BaseAddresses::default()
+            .set_eh_frame(0)
+            .set_got(0)
+            .set_text(0);
+
+        b.iter(|| {
+            let mut entries = eh_frame.entries(&bases);
+            while let Some(entry) = entries.next().expect("Should parse CFI entry OK") {
+                match entry {
+                    CieOrFde::Cie(cie) => {
+                        let mut instrs = cie.instructions(&eh_frame, &bases);
+                        while let Some(i) =
+                            instrs.next().expect("Can parse next CFI instruction OK")
+                        {
+                            test::black_box(i);
+                        }
+                    }
+                    CieOrFde::Fde(partial) => {
+                        let fde = partial
+                            .parse(EhFrame::cie_from_offset)
+                            .expect("Should be able to get CIE for FED");
+                        let mut instrs = fde.instructions(&eh_frame, &bases);
+                        while let Some(i) =
+                            instrs.next().expect("Can parse next CFI instruction OK")
+                        {
+                            test::black_box(i);
+                        }
+                    }
+                };
+            }
+        });
+    }
+
+    #[bench]
+    fn iterate_entries_evaluate_every_fde(b: &mut test::Bencher) {
+        let eh_frame = read_section("eh_frame");
+        let eh_frame = EhFrame::new(&eh_frame, LittleEndian);
+
+        let bases = BaseAddresses::default()
+            .set_eh_frame(0)
+            .set_got(0)
+            .set_text(0);
+
+        let mut ctx = Box::new(UnwindContext::new());
+
+        b.iter(|| {
+            let mut entries = eh_frame.entries(&bases);
+            while let Some(entry) = entries.next().expect("Should parse CFI entry OK") {
+                match entry {
+                    CieOrFde::Cie(_) => {}
+                    CieOrFde::Fde(partial) => {
+                        let fde = partial
+                            .parse(EhFrame::cie_from_offset)
+                            .expect("Should be able to get CIE for FED");
+                        let mut table = fde
+                            .rows(&eh_frame, &bases, &mut ctx)
+                            .expect("Should be able to initialize ctx");
+                        while let Some(row) =
+                            table.next_row().expect("Should get next unwind table row")
+                        {
+                            test::black_box(row);
+                        }
+                    }
+                };
+            }
+        });
+    }
+
+    fn instrs_len<R: Reader>(
+        eh_frame: &EhFrame<R>,
+        bases: &BaseAddresses,
+        fde: &FrameDescriptionEntry<R>,
+    ) -> usize {
+        fde.instructions(eh_frame, bases)
+            .fold(0, |count, _| Ok(count + 1))
+            .expect("fold over instructions OK")
+    }
+
+    fn get_fde_with_longest_cfi_instructions<R: Reader>(
+        eh_frame: &EhFrame<R>,
+        bases: &BaseAddresses,
+    ) -> FrameDescriptionEntry<R> {
+        let mut longest: Option<(usize, FrameDescriptionEntry<_>)> = None;
+
+        let mut entries = eh_frame.entries(bases);
+        while let Some(entry) = entries.next().expect("Should parse CFI entry OK") {
+            match entry {
+                CieOrFde::Cie(_) => {}
+                CieOrFde::Fde(partial) => {
+                    let fde = partial
+                        .parse(EhFrame::cie_from_offset)
+                        .expect("Should be able to get CIE for FED");
+
+                    let this_len = instrs_len(eh_frame, bases, &fde);
+
+                    let found_new_longest = match longest {
+                        None => true,
+                        Some((longest_len, ref _fde)) => this_len > longest_len,
+                    };
+
+                    if found_new_longest {
+                        longest = Some((this_len, fde));
+                    }
+                }
+            };
+        }
+
+        longest.expect("At least one FDE in .eh_frame").1
+    }
+
+    #[bench]
+    fn parse_longest_fde_instructions(b: &mut test::Bencher) {
+        let eh_frame = read_section("eh_frame");
+        let eh_frame = EhFrame::new(&eh_frame, LittleEndian);
+        let bases = BaseAddresses::default()
+            .set_eh_frame(0)
+            .set_got(0)
+            .set_text(0);
+        let fde = get_fde_with_longest_cfi_instructions(&eh_frame, &bases);
+
+        b.iter(|| {
+            let mut instrs = fde.instructions(&eh_frame, &bases);
+            while let Some(i) = instrs.next().expect("Should parse instruction OK") {
+                test::black_box(i);
+            }
+        });
+    }
+
+    #[bench]
+    fn eval_longest_fde_instructions_new_ctx_everytime(b: &mut test::Bencher) {
+        let eh_frame = read_section("eh_frame");
+        let eh_frame = EhFrame::new(&eh_frame, LittleEndian);
+        let bases = BaseAddresses::default()
+            .set_eh_frame(0)
+            .set_got(0)
+            .set_text(0);
+        let fde = get_fde_with_longest_cfi_instructions(&eh_frame, &bases);
+
+        b.iter(|| {
+            let mut ctx = Box::new(UnwindContext::new());
+            let mut table = fde
+                .rows(&eh_frame, &bases, &mut ctx)
+                .expect("Should initialize the ctx OK");
+            while let Some(row) = table.next_row().expect("Should get next unwind table row") {
+                test::black_box(row);
+            }
+        });
+    }
+
+    #[bench]
+    fn eval_longest_fde_instructions_same_ctx(b: &mut test::Bencher) {
+        let eh_frame = read_section("eh_frame");
+        let eh_frame = EhFrame::new(&eh_frame, LittleEndian);
+        let bases = BaseAddresses::default()
+            .set_eh_frame(0)
+            .set_got(0)
+            .set_text(0);
+        let fde = get_fde_with_longest_cfi_instructions(&eh_frame, &bases);
+
+        let mut ctx = Box::new(UnwindContext::new());
+
+        b.iter(|| {
+            let mut table = fde
+                .rows(&eh_frame, &bases, &mut ctx)
+                .expect("Should initialize the ctx OK");
+            while let Some(row) = table.next_row().expect("Should get next unwind table row") {
+                test::black_box(row);
+            }
+        });
+    }
+}