[Vm-dev] VM Maker: VMMaker.oscog-eem.2896.mcz

[commits at source.squeak.org]

Eliot Miranda uploaded a new version of VMMaker to project VM Maker:
http://source.squeak.org/VMMaker/VMMaker.oscog-eem.2896.mcz

==================== Summary ====================

Name: VMMaker.oscog-eem.2896
Author: eem
Time: 24 November 2020, 7:08:08.082966 pm
UUID: 0f15d287-0675-49c0-8fed-925890a76ffc
Ancestors: VMMaker.oscog-eem.2895

An alloca version of stackStringValue: (stackEphemeralStringValue:) could be generally useful.

=============== Diff against VMMaker.oscog-eem.2895 ===============

Item was added:
+ ----- Method: InterpreterPlugin>>stackEphemeralStringValue: (in category 'API access') -----
+ stackEphemeralStringValue: index
+ 	"Convenience to answer a given argument as a C string using stack allocation.
+ 	 Fails if the argument is not a string or there is no memory."
+ 	<returnTypeC: #'char *'>
+ 	<inline: #always>
+ 	| obj sz dstPtr |
+ 	<var: 'dstPtr' type: #'char *'>
+ 	obj := interpreterProxy stackValue: index.
+ 	(interpreterProxy isBytes: obj) ifFalse:
+ 		[interpreterProxy primitiveFailFor: PrimErrBadArgument.
+ 		^nil].
+ 	sz := interpreterProxy byteSizeOf: obj.
+ 	dstPtr := self alloca: sz+1.
+ 	dstPtr ifNil:
+ 		[interpreterProxy primitiveFailFor: PrimErrNoCMemory.
+ 		^nil].
+ 	self memcpy: dstPtr _: (interpreterProxy firstIndexableField: obj) _: sz.
+ 	dstPtr at: sz put: 0.
+ 	^dstPtr!