Flang glossary

Name	Explanation
ADT	Abstract Data Types.
ASD	Array Subscript Descriptor - holds the number of dimensions for an array, see ast.h.
AST	Abstract Syntax Tree.
BE	short for “backend” (used heavily in code and comments)
FE	short for “frontend” (used heavily in code and comments)
ILM	Intermediate Language Macros. Representation of executable statements. This is an output of flang1 and input for flang2.
ILI	Intermediate Language Instructions. The IR used by flang2 for optimisations.
ILT	Terminal node of an ILI statement which corresponds to a source language statement. A sequence of ILTs represent a block. ILTs have links to next and previous.
IPA	InterProcedural Analysis https://en.wikipedia.org/wiki/Interprocedural_optimization
IR	Intermediate Representation. A general term which may refer to many representations.
PGI	Older version of Fortran compiler, which Flang front-end bases on. PGI Compilers & Tools have evolved into the NVIDIA HPC SDK.
SD	Static Descriptor (used with pointers e.g. ptr$sd)
STB	Symbol TaBle, created symbol after symbol as identified by the parser
SHD	SHape Descriptor - holds the lower and upper bound of an array and the stride.
STD	STatement Descriptor - a larger, more generic structure describing the parsed code elements See ast.h for full members list.
TBAA	Type Based Alias Analysis
TPV	Target Processor Value (used in semant.c)