Move select out of the "control flow opcodes" section. #695
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…686) * Clarify that wasm may be viewed as either an AST or a stack machine. * Reword the introductory paragraph. * Add parens, remove "typed".
Make opcode 0x00 `unreachable`, and move `nop` to a non-zero opcode. All-zeros is one of the more common patterns of corrupted data. This change makes it more likely that code that is accidentally zeroed, in whole or in part, will be noticed when executed rather than silently running through a nop slide. Obviously, this doesn't matter when an opcode table is present, but if there is a default opcode table, it would presumably use the opcodes defined here.
And into the "Basic opcodes" section, renumbering the remainder of the section accordingly.
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lgtm |
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I think we should do a big one-step reorganization instead of small steps, and the reorganization needs to balance a couple of things: compressibility, extensibility, and logical consistency. In particular, some advice from the Brotli compression folks suggested that the opcodes should be organized to reduce entropy and allow the compression algorithm to do a better job. |
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If someone wants to compute a Brotli-friendly order, that's fine with me. If we wish to balance it with logical consistency, organizing the opcodes for logical consistency before we begin will simplify the process. |
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Should be subsumed by #826 now. |
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And into the "Basic opcodes" section, renumbering the remainder of the
section accordingly.
This is for the binary_0xc branch, and is one step of a broader opcode reorganization.