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a4f08f8307
Each ISA's hand-written ENCODING_TABLE (the single source of truth) now lives in a per-arch tablegen/ metaprogram that flattens it and serializes committed binary blobs; the library #loads those into @(rodata) at compile time rather than compiling a table body. No arch keeps encoding_table.odin or decoding_tables.odin -- only a generated tables.odin loader and tables/*.bin. * Two-stage, type-checked pipeline: tablegen Stage A emits human-readable generated Odin, which compiles and serializes the blobs in Stage B. * encode() goes through encoding_forms(m); decoders are unchanged apart from x86's flattened 2-D index. Decode tables are byte-identical to the old ones. * build.lua: a LuaJIT driver for the metaprograms, validations, and tests, with cross-platform gating and a clear report. * Docs refreshed; the obsolete forward-looking plan in cross_arch_design.md trimmed to what was actually built. * Attribution headers added to all rexcode source files; the generators emit them so generated files keep them.
65 lines
2.6 KiB
Odin
65 lines
2.6 KiB
Odin
// rexcode · Brendan Punsky (dotbmp@github), original author
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package rexcode_riscv
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// =============================================================================
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// GENERATED FILE - DO NOT EDIT
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// =============================================================================
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//
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// Loads the flat binary encode/decode tables into @(rodata). Produced by tablegen:
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//
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// odin run tablegen # Stage A: ENCODING_TABLE -> generated/ + this file
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// odin run tablegen/generated # Stage B: typed Odin literals -> tables/*.bin
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//
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// The .bin blobs are raw, host-endian, packed struct images.
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// -----------------------------------------------------------------------------
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// Subsidiary table types (generated scaffolding)
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// -----------------------------------------------------------------------------
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// Companion run index: ENCODE_RUNS[mnemonic] -> contiguous run in ENCODE_FORMS.
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Encode_Run :: struct {
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start: u32,
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count: u32,
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}
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Decode_Entry :: struct #packed {
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mnemonic: Mnemonic, // 2
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ops: [4]Operand_Type, // 4
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enc: [4]Operand_Encoding, // 4
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bits: u32, // 4
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mask: u32, // 4
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feature: Feature, // 1
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flags: Encoding_Flags, // 1
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}
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#assert(size_of(Decode_Entry) == 20)
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Decode_Index :: struct #packed {
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start: u16,
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count: u16,
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}
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#assert(size_of(Decode_Index) == 4)
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// -----------------------------------------------------------------------------
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// Loaded tables (rodata, embedded from tables/*.bin at compile time)
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// -----------------------------------------------------------------------------
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@(rodata) ENCODE_FORMS := #load("tables/riscv.encode_forms.bin", []Encoding)
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@(rodata) ENCODE_RUNS := #load("tables/riscv.encode_runs.bin", []Encode_Run)
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@(rodata) DECODE_ENTRIES := #load("tables/riscv.entries.bin", []Decode_Entry)
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@(rodata) DECODE_INDEX_OPCODE := #load("tables/riscv.idx_opcode.bin", []Decode_Index)
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@(rodata) DECODE_INDEX_OP_FP := #load("tables/riscv.idx_op_fp.bin", []Decode_Index)
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@(rodata) DECODE_INDEX_RVC := #load("tables/riscv.idx_rvc.bin", []Decode_Index)
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// -----------------------------------------------------------------------------
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// Accessors
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// -----------------------------------------------------------------------------
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// Per-mnemonic encode forms: the run of ENCODE_FORMS belonging to `m`.
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// Replaces the old ENCODING_TABLE[m] slice; the returned view is into rodata.
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@(private, require_results)
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encoding_forms :: #force_inline proc "contextless" (m: Mnemonic) -> []Encoding {
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r := ENCODE_RUNS[u16(m)]
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return ENCODE_FORMS[r.start:][:r.count]
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}
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