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Mmap debug info on linux

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Closes #907.
This commit is contained in:
Marc Tiehuis
2019-05-13 20:04:25 +12:00
parent c1793d6106
commit c4d1597f50
3 changed files with 106 additions and 28 deletions
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42
std/debug.zig
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@@ -1004,21 +1004,33 @@ pub fn openElfDebugInfo(
fn openSelfDebugInfoLinux(allocator: *mem.Allocator) !DwarfInfo {
const S = struct {
var self_exe_file: os.File = undefined;
var self_exe_seekable_stream: os.File.SeekableStream = undefined;
var self_exe_in_stream: os.File.InStream = undefined;
var self_exe_mmap_seekable: io.SliceSeekableInStream = undefined;
};
S.self_exe_file = try os.openSelfExe();
errdefer S.self_exe_file.close();
S.self_exe_seekable_stream = S.self_exe_file.seekableStream();
S.self_exe_in_stream = S.self_exe_file.inStream();
const self_exe_mmap_len = try S.self_exe_file.getEndPos();
const self_exe_mmap = os.posix.mmap(
null,
self_exe_mmap_len,
os.posix.PROT_READ,
os.posix.MAP_SHARED,
S.self_exe_file.handle,
0,
);
if (self_exe_mmap == os.posix.MAP_FAILED) return error.OutOfMemory;
errdefer assert(os.posix.munmap(self_exe_mmap, self_exe_mmap_len) == 0);
const file_mmap_slice = @intToPtr([*]const u8, self_exe_mmap)[0..self_exe_mmap_len];
S.self_exe_mmap_seekable = io.SliceSeekableInStream.init(file_mmap_slice);
return openElfDebugInfo(
allocator,
// TODO https://github.com/ziglang/zig/issues/764
@ptrCast(*DwarfSeekableStream, &S.self_exe_seekable_stream.stream),
@ptrCast(*DwarfSeekableStream, &S.self_exe_mmap_seekable.seekable_stream),
// TODO https://github.com/ziglang/zig/issues/764
@ptrCast(*DwarfInStream, &S.self_exe_in_stream.stream),
@ptrCast(*DwarfInStream, &S.self_exe_mmap_seekable.stream),
);
}
@@ -1478,16 +1490,14 @@ fn parseFormValueTargetAddrSize(in_stream: var) !u64 {
}
fn parseFormValueRef(allocator: *mem.Allocator, in_stream: var, size: i32) !FormValue {
return FormValue{
.Ref = switch (size) {
1 => try in_stream.readIntLittle(u8),
2 => try in_stream.readIntLittle(u16),
4 => try in_stream.readIntLittle(u32),
8 => try in_stream.readIntLittle(u64),
-1 => try leb.readULEB128(u64, in_stream),
else => unreachable,
},
};
return FormValue{ .Ref = switch (size) {
1 => try in_stream.readIntLittle(u8),
2 => try in_stream.readIntLittle(u16),
4 => try in_stream.readIntLittle(u32),
8 => try in_stream.readIntLittle(u64),
-1 => try leb.readULEB128(u64, in_stream),
else => unreachable,
} };
}
fn parseFormValue(allocator: *mem.Allocator, in_stream: var, form_id: u64, is_64: bool) anyerror!FormValue {