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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.
50 lines
1.3 KiB
Odin
50 lines
1.3 KiB
Odin
// rexcode · Brendan Punsky (dotbmp@github), original author
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package rexcode_isa
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// =============================================================================
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// ERROR / RESULT TYPES (shared by encoder and decoder, all architectures)
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// =============================================================================
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//
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// The struct shapes are universal. Error_Code holds the full set of codes
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// any architecture may produce; per-arch encoders/decoders only emit the
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// subset that applies to them. When an arch needs a new code (e.g.
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// RISC-V's MISALIGNED_IMMEDIATE), add it here.
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Error_Code :: enum u8 {
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NONE = 0,
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// Shared encoding errors
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INVALID_MNEMONIC,
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NO_MATCHING_ENCODING,
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OPERAND_MISMATCH,
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IMMEDIATE_OUT_OF_RANGE,
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BUFFER_OVERFLOW,
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LABEL_OUT_OF_RANGE,
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INVALID_OPERAND_COUNT, // operand_count > 4 or doesn't match operands
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// Shared decoding errors
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BUFFER_TOO_SHORT,
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INVALID_OPCODE,
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// x86-specific decoding errors
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INVALID_MODRM,
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INVALID_SIB,
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INVALID_PREFIX,
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INVALID_VEX,
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INVALID_EVEX,
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TOO_MANY_PREFIXES,
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}
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Error :: struct #packed {
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inst_idx: u32, // Which instruction failed (or byte offset for decode)
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code: Error_Code,
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_: [3]u8,
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}
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#assert(size_of(Error) == 8)
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Result :: struct {
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byte_count: u32, // Bytes written/read
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success: bool, // True if no errors
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}
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