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Reviewing. Successfuly reworked register allocation for tape runs.

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ed
2026-08-18 00:26:36 -04:00
parent 5a4bfb1224
commit da007d342e
19 changed files with 841 additions and 1787 deletions
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scripts/elf_dwarf.lua
+22 -23
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@@ -422,10 +422,10 @@ end
--- should use this directly rather than going through `read_form_value`,
--- which only exposes the low 4 bytes to preserve its existing (value, next_pos) return shape.
--- @param buf string
--- @param pos integer -- zero-based wire offset
--- @return integer -- low 4 bytes (LE), the type signature
--- @return integer -- high 4 bytes (LE), the offset within the matching type unit
--- @return integer -- cursor after the 8-byte value
--- @param pos integer -- zero-based wire offset
--- @return integer -- low 4 bytes (LE), the type signature
--- @return integer -- high 4 bytes (LE), the offset within the matching type unit
--- @return integer -- cursor after the 8-byte value
function M.read_ref_sig8(buf, pos)
return M.read_u32_le(buf, pos), M.read_u32_le(buf, pos + 4), pos + 8
end
@@ -440,10 +440,10 @@ end
--- unit_length(4) + version(2) + unit_type(1) + address_size(1) + debug_abbrev_offset(4)
--- followed by type_unit_specific fields: type_signature(8) + type_offset(4)
--- The type_signature is at byte offset 8 of the body (right after debug_abbrev_offset).
--- @param info string -- the .debug_info section bytes
--- @param target_sig_lo integer -- low 4 bytes (LE) of the desired signature
--- @param target_sig_hi integer -- high 4 bytes (LE) of the desired signature
--- @return integer|nil, integer|nil -- unit offset, type_offset within the unit
--- @param info string -- the .debug_info section bytes
--- @param target_sig_lo integer -- low 4 bytes (LE) of the desired signature
--- @param target_sig_hi integer -- high 4 bytes (LE) of the desired signature
--- @return integer|nil, integer|nil -- unit offset, type_offset within the unit
function M.find_type_unit_by_signature(info, target_sig_lo, target_sig_hi)
local pos = 0
local section_len = #info
@@ -459,24 +459,23 @@ function M.find_type_unit_by_signature(info, target_sig_lo, target_sig_hi)
return nil, nil -- malformed
end
-- Per DWARF5 §7.5.6, the type_unit (DW_UT_type = 0x02) body layout is:
-- 0: version (2)
-- 2: unit_type (1) -- DW_UT_type = 0x02
-- 3: address_size (1)
-- 4: debug_abbrev_offset (4)
-- 8: type_signature (8)
-- 16: type_offset (4)
-- 20: <children>
-- 0: version (2)
-- 2: unit_type (1) -- DW_UT_type = 0x02
-- 3: address_size (1)
-- 4: debug_abbrev_offset (4)
-- 8: type_signature (8)
-- 16: type_offset (4)
-- 20: <children>
if body_end - body_start >= 20 then
-- read_ref_sig8 / write_u32_le / etc. are 1-indexed (string:byte);
-- pos / body_start / body_end are 0-based wire offsets, so the
-- 1-indexed byte at 0-based wire offset X is string:byte(X + 1).
-- pos / body_start / body_end are 0-based wire offsets, so the 1-indexed byte at 0-based wire offset X is string:byte(X + 1).
-- Per DWARF5 §7.5.6, the type_unit body is laid out as:
-- byte 0-1: version (2)
-- byte 2: unit_type (1) -- DW_UT_type = 0x02
-- byte 3: address_size (1)
-- byte 4-7: debug_abbrev_offset (4)
-- byte 8-15: type_signature (8)
-- byte 16-19: type_offset (4)
-- byte 0-1: version (2)
-- byte 2: unit_type (1) -- DW_UT_type = 0x02
-- byte 3: address_size (1)
-- byte 4-7: debug_abbrev_offset (4)
-- byte 8-15: type_signature (8)
-- byte 16-19: type_offset (4)
local unit_type = info:byte(body_start + 2 + 1) -- 0-based +2 = unit_type in 1-indexed
if unit_type == 0x02 then -- DW_UT_type
local sig_lo, sig_hi, _ = M.read_ref_sig8(info, body_start + 8) -- 0-based +8 = type_signature in 1-indexed