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debug: support looking up debug symbols in both PDB and DWARF debug info, instead of only using DWARF if .debug_info is present

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coff: support reading from memory loaded by the loader, or a mapped file
This commit is contained in:
kcbanner 2023-08-15 02:22:22 -04:00
parent a155e35850
commit 5b86180ae3
2 changed files with 66 additions and 39 deletions
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24
lib/std/coff.zig
View File

@ -1059,6 +1059,8 @@ pub const CoffError = error{
// Official documentation of the format: https://docs.microsoft.com/en-us/windows/win32/debug/pe-format
pub const Coff = struct {
data: []const u8,
// Set if `data` is backed by the image as loaded by the loader
is_loaded: bool,
is_image: bool,
coff_header_offset: usize,
@ -1066,7 +1068,7 @@ pub const Coff = struct {
age: u32 = undefined,
// The lifetime of `data` must be longer than the lifetime of the returned Coff
pub fn init(data: []const u8) !Coff {
pub fn init(data: []const u8, is_loaded: bool) !Coff {
const pe_pointer_offset = 0x3C;
const pe_magic = "PE\x00\x00";
@ -1082,6 +1084,7 @@ pub const Coff = struct {
var coff = @This(){
.data = data,
.is_image = is_image,
.is_loaded = is_loaded,
.coff_header_offset = coff_header_offset,
};
@ -1106,7 +1109,18 @@ pub const Coff = struct {
var stream = std.io.fixedBufferStream(self.data);
const reader = stream.reader();
try stream.seekTo(debug_dir.virtual_address);
if (self.is_loaded) {
try stream.seekTo(debug_dir.virtual_address);
} else {
// Find what section the debug_dir is in, in order to convert the RVA to a file offset
for (self.getSectionHeaders()) |*sect| {
if (debug_dir.virtual_address >= sect.virtual_address and debug_dir.virtual_address < sect.virtual_address + sect.virtual_size) {
try stream.seekTo(sect.pointer_to_raw_data + (debug_dir.virtual_address - sect.virtual_address));
break;
}
} else return error.InvalidDebugDirectory;
}
// Find the correct DebugDirectoryEntry, and where its data is stored.
// It can be in any section.
@ -1115,7 +1129,8 @@ pub const Coff = struct {
blk: while (i < debug_dir_entry_count) : (i += 1) {
const debug_dir_entry = try reader.readStruct(DebugDirectoryEntry);
if (debug_dir_entry.type == .CODEVIEW) {
try stream.seekTo(debug_dir_entry.address_of_raw_data);
const dir_offset = if (self.is_loaded) debug_dir_entry.address_of_raw_data else debug_dir_entry.pointer_to_raw_data;
try stream.seekTo(dir_offset);
break :blk;
}
}
@ -1256,7 +1271,8 @@ pub const Coff = struct {
}
pub fn getSectionData(self: *const Coff, sec: *align(1) const SectionHeader) []const u8 {
return self.data[sec.pointer_to_raw_data..][0..sec.virtual_size];
const offset = if (self.is_loaded) sec.virtual_address else sec.pointer_to_raw_data;
return self.data[offset..][0..sec.virtual_size];
}
pub fn getSectionDataAlloc(self: *const Coff, sec: *align(1) const SectionHeader, allocator: mem.Allocator) ![]u8 {

81
lib/std/debug.zig
View File

@ -997,7 +997,6 @@ fn readCoffDebugInfo(allocator: mem.Allocator, coff_obj: *coff.Coff) !ModuleDebu
.base_address = undefined,
.coff_image_base = coff_obj.getImageBase(),
.coff_section_headers = undefined,
.debug_data = undefined,
};
if (coff_obj.getSectionByName(".debug_info")) |_| {
@ -1022,11 +1021,10 @@ fn readCoffDebugInfo(allocator: mem.Allocator, coff_obj: *coff.Coff) !ModuleDebu
};
try DW.openDwarfDebugInfo(&dwarf, allocator);
di.debug_data = PdbOrDwarf{ .dwarf = dwarf };
return di;
di.dwarf = dwarf;
}
// Only used by pdb path
// Only used by the pdb path
di.coff_section_headers = try coff_obj.getSectionHeadersAlloc(allocator);
errdefer allocator.free(di.coff_section_headers);
@ -1037,15 +1035,19 @@ fn readCoffDebugInfo(allocator: mem.Allocator, coff_obj: *coff.Coff) !ModuleDebu
const path = try fs.path.resolve(allocator, &[_][]const u8{raw_path});
defer allocator.free(path);
di.debug_data = PdbOrDwarf{ .pdb = undefined };
di.debug_data.pdb = pdb.Pdb.init(allocator, path) catch |err| switch (err) {
error.FileNotFound, error.IsDir => return error.MissingDebugInfo,
di.pdb = pdb.Pdb.init(allocator, path) catch |err| switch (err) {
error.FileNotFound, error.IsDir => {
if (di.dwarf == null) return error.MissingDebugInfo;
allocator.free(di.coff_section_headers);
di.coff_section_headers = undefined;
return di;
},
else => return err,
};
try di.debug_data.pdb.parseInfoStream();
try di.debug_data.pdb.parseDbiStream();
try di.pdb.?.parseInfoStream();
try di.pdb.?.parseDbiStream();
if (!mem.eql(u8, &coff_obj.guid, &di.debug_data.pdb.guid) or coff_obj.age != di.debug_data.pdb.age)
if (!mem.eql(u8, &coff_obj.guid, &di.pdb.?.guid) or coff_obj.age != di.pdb.?.age)
return error.InvalidDebugInfo;
return di;
@ -1695,7 +1697,7 @@ pub const DebugInfo = struct {
errdefer self.allocator.destroy(obj_di);
const mapped_module = @as([*]const u8, @ptrFromInt(module.base_address))[0..module.size];
var coff_obj = try coff.Coff.init(mapped_module);
var coff_obj = try coff.Coff.init(mapped_module, true);
// The string table is not mapped into memory by the loader, so if a section name is in the
// string table then we have to map the full image file from disk. This can happen when
@ -1753,7 +1755,7 @@ pub const DebugInfo = struct {
errdefer assert(windows.ntdll.NtUnmapViewOfSection(process_handle, @ptrFromInt(base_ptr)) == .SUCCESS);
const section_view = @as([*]const u8, @ptrFromInt(base_ptr))[0..coff_len];
coff_obj = try coff.Coff.init(section_view);
coff_obj = try coff.Coff.init(section_view, false);
module.mapped_file = .{
.file = coff_file,
@ -2141,34 +2143,27 @@ pub const ModuleDebugInfo = switch (native_os) {
},
.uefi, .windows => struct {
base_address: usize,
debug_data: PdbOrDwarf,
pdb: ?pdb.Pdb = null,
dwarf: ?DW.DwarfInfo = null,
coff_image_base: u64,
/// Only used if debug_data is .pdb
/// Only used if pdb is non-null
coff_section_headers: []coff.SectionHeader,
pub fn deinit(self: *@This(), allocator: mem.Allocator) void {
self.debug_data.deinit(allocator);
if (self.debug_data == .pdb) {
if (self.dwarf) |*dwarf| {
dwarf.deinit(allocator);
}
if (self.pdb) |*p| {
p.deinit();
allocator.free(self.coff_section_headers);
}
}
pub fn getSymbolAtAddress(self: *@This(), allocator: mem.Allocator, address: usize) !SymbolInfo {
// Translate the VA into an address into this object
const relocated_address = address - self.base_address;
switch (self.debug_data) {
.dwarf => |*dwarf| {
const dwarf_address = relocated_address + self.coff_image_base;
return getSymbolFromDwarf(allocator, dwarf_address, dwarf);
},
.pdb => {
// fallthrough to pdb handling
},
}
fn getSymbolFromPdb(self: *@This(), relocated_address: usize) !?SymbolInfo {
var coff_section: *align(1) const coff.SectionHeader = undefined;
const mod_index = for (self.debug_data.pdb.sect_contribs) |sect_contrib| {
const mod_index = for (self.pdb.?.sect_contribs) |sect_contrib| {
if (sect_contrib.Section > self.coff_section_headers.len) continue;
// Remember that SectionContribEntry.Section is 1-based.
coff_section = &self.coff_section_headers[sect_contrib.Section - 1];
@ -2180,18 +2175,18 @@ pub const ModuleDebugInfo = switch (native_os) {
}
} else {
// we have no information to add to the address
return SymbolInfo{};
return null;
};
const module = (try self.debug_data.pdb.getModule(mod_index)) orelse
const module = (try self.pdb.?.getModule(mod_index)) orelse
return error.InvalidDebugInfo;
const obj_basename = fs.path.basename(module.obj_file_name);
const symbol_name = self.debug_data.pdb.getSymbolName(
const symbol_name = self.pdb.?.getSymbolName(
module,
relocated_address - coff_section.virtual_address,
) orelse "???";
const opt_line_info = try self.debug_data.pdb.getLineNumberInfo(
const opt_line_info = try self.pdb.?.getLineNumberInfo(
module,
relocated_address - coff_section.virtual_address,
);
@ -2203,6 +2198,22 @@ pub const ModuleDebugInfo = switch (native_os) {
};
}
pub fn getSymbolAtAddress(self: *@This(), allocator: mem.Allocator, address: usize) !SymbolInfo {
// Translate the VA into an address into this object
const relocated_address = address - self.base_address;
if (self.pdb != null) {
if (try self.getSymbolFromPdb(relocated_address)) |symbol| return symbol;
}
if (self.dwarf) |*dwarf| {
const dwarf_address = relocated_address + self.coff_image_base;
return getSymbolFromDwarf(allocator, dwarf_address, dwarf);
}
return SymbolInfo{};
}
pub fn getDwarfInfoForAddress(self: *@This(), allocator: mem.Allocator, address: usize) !?*const DW.DwarfInfo {
_ = allocator;
_ = address;