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Wasm89 - Wasm for bad compilers

This is a port of wac-esp with the following changes to support bad/outdated c89/c90 compilers, for when you have to deal with outdated vendor toolchains.

Changes:

  • Removed dependency on stdint.h
  • Doesn't need snprintf
  • Comments style changed from // to /*
  • Removed ESP specific code
  • Replaced clz/popcnt/etc builtins with slow c versions
  • Replaced c89 missing float ops
  • Moved inline variable definitions to start of function
  • Added extern "C" guards for use from c++
  • Added support for "Sign Extention Extension"
  • Add test environment
  • Passes a large amount of WG-1.0

Compiler requirements:

This currently requires the following non-standard features, pull requests to change this are welcome:

  • A 64 bit integer type long long / _int64
  • Parser support for variadic macros (or remove all the logs)

Compiler support:

  • clang
  • gcc
  • MSVC 2008 or newer (Tested with 15.0.21022.08)

Architecture support:

  • ARMv4T
  • ARM64
  • x86
  • x86_64