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figuring out where /names stream is

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This commit is contained in:
Andrew Kelley 2018-08-31 19:50:03 -04:00
parent b36b93fb3e
commit 6ddbd345aa
2 changed files with 52 additions and 19 deletions
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70
std/debug/index.zig
View File

@ -455,33 +455,65 @@ fn openSelfDebugInfoWindows(allocator: *mem.Allocator) !DebugInfo {
const name_bytes = try allocator.alloc(u8, name_bytes_len);
try pdb_stream.stream.readNoEof(name_bytes);
//const HashTableHeader = packed struct {
// Size: u32,
// Capacity: u32,
const HashTableHeader = packed struct {
Size: u32,
Capacity: u32,
// fn maxLoad(cap: u32) u32 {
// return cap * 2 / 3 + 1;
// }
//};
//var hash_tbl_hdr: HashTableHeader = undefined;
//try pdb_stream.stream.readStruct(Header, &hash_tbl_hdr);
//if (hash_tbl_hdr.Capacity == 0)
// return error.InvalidDebugInfo;
fn maxLoad(cap: u32) u32 {
return cap * 2 / 3 + 1;
}
};
var hash_tbl_hdr: HashTableHeader = undefined;
try pdb_stream.stream.readStruct(HashTableHeader, &hash_tbl_hdr);
if (hash_tbl_hdr.Capacity == 0)
return error.InvalidDebugInfo;
//if (hash_tbl_hdr.Size > HashTableHeader.maxLoad(hash_tbl_hdr.Capacity))
// return error.InvalidDebugInfo;
if (hash_tbl_hdr.Size > HashTableHeader.maxLoad(hash_tbl_hdr.Capacity))
return error.InvalidDebugInfo;
//std.debug.warn("{}\n", hash_tbl_hdr);
std.debug.warn("{}\n", hash_tbl_hdr);
//var more_buf: [100]u8 = undefined;
//const more_len = try pdb_stream.stream.read(more_buf[0..]);
//for (more_buf[0..more_len]) |x| {
// std.debug.warn("{x2} {c}\n", x, x);
//}
const present = try readSparseBitVector(&pdb_stream.stream, allocator);
if (present.len != hash_tbl_hdr.Size)
return error.InvalidDebugInfo;
const deleted = try readSparseBitVector(&pdb_stream.stream, allocator);
const Bucket = struct {
first: u32,
second: u32,
};
const bucket_list = try allocator.alloc(Bucket, present.len);
const string_table_index = for (present) |_| {
const name_offset = try pdb_stream.stream.readIntLe(u32);
const name_index = try pdb_stream.stream.readIntLe(u32);
const name = mem.toSlice(u8, name_bytes.ptr + name_offset);
if (mem.eql(u8, name, "/names")) {
break name_index;
}
} else return error.MissingDebugInfo;
di.pdb.string_table = di.pdb.getStreamById(string_table_index) orelse return error.InvalidDebugInfo;
return di;
}
fn readSparseBitVector(stream: var, allocator: *mem.Allocator) ![]usize {
const num_words = try stream.readIntLe(u32);
var word_i: usize = 0;
var list = ArrayList(usize).init(allocator);
while (word_i != num_words) : (word_i += 1) {
const word = try stream.readIntLe(u32);
var bit_i: u5 = 0;
while (true) : (bit_i += 1) {
if (word & (u32(1) << bit_i) != 0) {
try list.append(word_i * 32 + bit_i);
}
if (bit_i == @maxValue(u5)) break;
}
}
return list.toOwnedSlice();
}
fn openSelfDebugInfoLinux(allocator: *mem.Allocator) !DebugInfo {
var di = DebugInfo{
.self_exe_file = undefined,

1
std/pdb.zig
View File

@ -406,6 +406,7 @@ pub const Pdb = struct {
in_file: os.File,
allocator: *mem.Allocator,
coff: *coff.Coff,
string_table: *MsfStream,
msf: Msf,