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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.
34 lines
1.2 KiB
Odin
34 lines
1.2 KiB
Odin
// rexcode · Brendan Punsky (dotbmp@github), original author
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package rexcode_mips
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// =============================================================================
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// MIPS 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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// enum and Relocation struct. The struct shape mirrors ELF rela so an
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// object emitter can consume it unchanged; the resolution semantics for
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// each `type` value are MIPS-specific and live in encoder.odin's pass-2
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// resolver.
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Relocation_Type :: enum u8 {
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NONE = 0,
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REL16, // 16-bit signed PC-rel branch offset (BEQ/BNE/BLEZ/BGTZ/...)
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REL21, // 21-bit signed PC-rel compact branch (R6 BEQZC/BNEZC)
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REL26, // 26-bit signed PC-rel compact branch (R6 BC/BALC)
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J26, // 26-bit J-type region target ((target_addr >> 2) & 0x3FFFFFF)
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HI16, // upper 16 of 32-bit absolute (LUI rt, %hi(sym)+0x8000 if LO16 paired)
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LO16, // lower 16 of 32-bit absolute (ADDIU rt, rt, %lo(sym))
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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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