An OpenGL GLSL and OpenGL|ES GLSL (ESSL) front-end for reference validation and
translation of GLSL/ESSL into an internal abstract syntax tree (AST).

An HLSL front-end for translation of an approximation of HLSL to glslang's AST
form.

Translates glslang's AST to the Khronos-specified SPIR-V intermediate language.

An API for getting reflection information from the AST, reflection
types/variables/etc. from the HLL source (not the SPIR-V).

glslang is command-line tool for accessing the functionality above.