findInlineeName

pub fn findInlineeName(self: *const Pdb, inlinee: u32) ?[]const u8

File

Code

pub fn findInlineeName(self: *const Pdb, inlinee: u32) ?[]const u8 {
    // According to LLVM, the high bit *can* be used to indicate that a type index comes from the
    // ipi stream in which case that bit needs to be cleared. LLVM doesn't generate data in this
    // manner, but we may as well handle it since it just involves a single bitwise and.
    // https://llvm.org/docs/PDB/TpiStream.html#type-indices
    const type_index = inlinee & 0x7FFFFFFF;

    var reader: Io.Reader = .fixed(self.ipi orelse return null);
    const header = reader.takeStructPointer(pdb.IpiStreamHeader) catch return null;
    for (header.type_index_begin..header.type_index_end) |curr_type_index| {
        const prefix = reader.takeStructPointer(pdb.LfRecordPrefix) catch return null;
        if (prefix.len < 2) return null;
        reader.discardAll(prefix.len - @sizeOf(u16)) catch return null;

        if (curr_type_index == type_index) {
            switch (prefix.kind) {
                .func_id => {
                    const func: *align(1) pdb.LfFuncId = @ptrCast(prefix);
                    return std.mem.sliceTo(@as([*:0]const u8, @ptrCast(&func.name[0])), 0);
                },
                .mfunc_id => {
                    const func: *align(1) pdb.LfMFuncId = @ptrCast(prefix);
                    return std.mem.sliceTo(@as([*:0]const u8, @ptrCast(&func.name[0])), 0);
                },
                else => return null,
            }
        }
    }
    return null;
}