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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.
35 lines
984 B
Odin
35 lines
984 B
Odin
// rexcode · Brendan Punsky (dotbmp@github), original author
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package rexcode_mos65816
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// =============================================================================
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// 65816 RELOCATIONS
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// =============================================================================
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//
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// Per the cross-arch design (§2.4): each arch owns its own Relocation_Type
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// and Relocation struct. The 65816's relocation kinds reflect the four
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// address widths it can patch:
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//
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// ABS16 2-byte LE absolute, low 16 of (base + target + addend)
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// ABS24 3-byte LE absolute, low 24 of (base + target + addend)
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// REL8 signed 8-bit PC-relative (target - (offset + 1))
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// REL16 signed 16-bit PC-relative (target - (offset + 2)) -- BRL, PER
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Relocation_Type :: enum u8 {
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NONE = 0,
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ABS16,
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ABS24,
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REL8,
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REL16,
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}
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Relocation :: struct #packed {
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offset: u32,
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label_id: u32,
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addend: i32,
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type: Relocation_Type,
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size: u8,
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inst_idx: u16,
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}
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#assert(size_of(Relocation) == 16)
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