Module Name: src
Committed By: rillig
Date: Sun Apr 11 12:46:55 UTC 2021
Modified Files:
src/usr.bin/make: hash.c hash.h var.c
Log Message:
make: avoid allocating memory for simple variable names
The main change is in ParseVarname, where a Buffer is replaced with the
newly introduced LazyBuf. LazyBuf is inspired by
https://golang.org/src/path/path.go.
In CanonicalVarname, the pre-comparison of the first letter of the
variable name is no longer necessary. GCC 9 optimizes a fixed-length
memcmp so well that the code can finally be written to target human
readers, leaving the optimization to the compiler.
To generate a diff of this commit:
cvs rdiff -u -r1.63 -r1.64 src/usr.bin/make/hash.c
cvs rdiff -u -r1.39 -r1.40 src/usr.bin/make/hash.h
cvs rdiff -u -r1.915 -r1.916 src/usr.bin/make/var.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
