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static analysis: immeidate field awarenss

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ed
2026-08-14 01:22:54 -04:00
parent a535d381ed
commit 3a4d6304dd
2 changed files with 137 additions and 0 deletions
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scripts/duffle.lua
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@@ -1962,6 +1962,52 @@ M.INSTRUCTION_GPR_EFFECTS = {
shift_aright_var = { reads = {2, 3}, writes = {1} },
}
-------------------------------------------------------------------------------
-- IMMEDIATE_FIELD_WIDTHS — maps instruction names to their immediate-argument
-- positions (1-based) and field widths (in bits). Consumed by the
-- `immediate_field_width` static-analysis check. Parallel to
-- INSTRUCTION_GPR_EFFECTS.
--
-- `signed = true` means the field is sign-extended (the value must fit in
-- the signed range). `signed = false` (default) means zero-extended.
-------------------------------------------------------------------------------
M.IMMEDIATE_FIELD_WIDTHS = {
-- CPU I-type immediates: 16-bit signed (addiu/addi/slti sign-extend)
add_ui = { { arg = 3, width = 16, signed = true } },
add_si = { { arg = 3, width = 16, signed = true } },
add_ui_self = { { arg = 2, width = 16, signed = true } },
slt_si = { { arg = 3, width = 16, signed = true } },
slt_ui = { { arg = 3, width = 16, signed = true } },
-- CPU I-type immediates: 16-bit unsigned (andi/ori/xori zero-extend)
and_i = { { arg = 3, width = 16 } },
or_i = { { arg = 3, width = 16 } },
or_i_self = { { arg = 2, width = 16 } },
xor_i = { { arg = 3, width = 16 } },
load_upper_i = { { arg = 2, width = 16 } },
-- Load/store offsets: 16-bit signed
load_word = { { arg = 3, width = 16, signed = true } },
load_half = { { arg = 3, width = 16, signed = true } },
load_half_u = { { arg = 3, width = 16, signed = true } },
load_byte = { { arg = 3, width = 16, signed = true } },
load_byte_u = { { arg = 3, width = 16, signed = true } },
store_word = { { arg = 3, width = 16, signed = true } },
store_half = { { arg = 3, width = 16, signed = true } },
store_byte = { { arg = 3, width = 16, signed = true } },
-- Shift amount: 5-bit unsigned
shift_lleft = { { arg = 3, width = 5 } },
shift_lleft_self = { { arg = 2, width = 5 } },
shift_lright = { { arg = 3, width = 5 } },
shift_aright = { { arg = 3, width = 5 } },
shift_aright_var = { { arg = 3, width = 5 } },
-- Branch offsets: 16-bit signed
branch_equal = { { arg = 3, width = 16, signed = true } },
branch_ne = { { arg = 3, width = 16, signed = true } },
branch_le_zero = { { arg = 2, width = 16, signed = true } },
branch_lt_zero = { { arg = 2, width = 16, signed = true } },
branch_ge_zero = { { arg = 2, width = 16, signed = true } },
branch_gt_zero = { { arg = 2, width = 16, signed = true } },
}
-- Bounded GPR-value rules consumed by the same forward event walk as `INSTRUCTION_GPR_EFFECTS`.
-- A rule describes a literal/constant-producing transform; if its required inputs are not constant, the destination is invalidated rather than carrying a stale value.
-- The lattice is deliberately closed to `{kind = "unknown"}` and `{kind = "constant", value = <U4>}`.