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dwarf: fixup regBytes for the case where there is no context support

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expressions: add more tests, fix tests for mipsel
debug: add lookupModuleName implementation for macos
This commit is contained in:
kcbanner
2023-07-07 18:37:10 -04:00
parent 5c0d4cef1a
commit 54ca62fef4
5 changed files with 413 additions and 70 deletions
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42
lib/std/debug.zig
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@@ -1518,10 +1518,10 @@ pub const DebugInfo = struct {
// Returns the module name for a given address.
// This can be called when getModuleForAddress fails, so implementations should provide
// a path that doesn't rely on any side-effects of successful module lookup.
// a path that doesn't rely on any side-effects of a prior successful module lookup.
pub fn getModuleNameForAddress(self: *DebugInfo, address: usize) ?[]const u8 {
if (comptime builtin.target.isDarwin()) {
return null;
return self.lookupModuleNameDyld(address);
} else if (native_os == .windows) {
return self.lookupModuleNameWin32(address);
} else if (native_os == .haiku) {
@@ -1590,6 +1590,44 @@ pub const DebugInfo = struct {
return error.MissingDebugInfo;
}
fn lookupModuleNameDyld(self: *DebugInfo, address: usize) ?[]const u8 {
_ = self;
const image_count = std.c._dyld_image_count();
var i: u32 = 0;
while (i < image_count) : (i += 1) {
const header = std.c._dyld_get_image_header(i) orelse continue;
const base_address = @intFromPtr(header);
if (address < base_address) continue;
const vmaddr_slide = std.c._dyld_get_image_vmaddr_slide(i);
var it = macho.LoadCommandIterator{
.ncmds = header.ncmds,
.buffer = @alignCast(@as(
[*]u8,
@ptrFromInt(@intFromPtr(header) + @sizeOf(macho.mach_header_64)),
)[0..header.sizeofcmds]),
};
while (it.next()) |cmd| switch (cmd.cmd()) {
.SEGMENT_64 => {
const segment_cmd = cmd.cast(macho.segment_command_64).?;
if (!mem.eql(u8, "__TEXT", segment_cmd.segName())) continue;
const original_address = address - vmaddr_slide;
const seg_start = segment_cmd.vmaddr;
const seg_end = seg_start + segment_cmd.vmsize;
if (original_address >= seg_start and original_address < seg_end) {
return mem.sliceTo(std.c._dyld_get_image_name(i), 0);
}
},
else => {},
};
}
return null;
}
fn lookupModuleWin32(self: *DebugInfo, address: usize) !*ModuleDebugInfo {
for (self.modules.items) |*module| {
if (address >= module.base_address and address < module.base_address + module.size) {