307152 - JS_EvaluateUCInStackFrame() cannot resolve local vars and function args

Status: RESOLVED WORKSFORME

(Core :: JavaScript Engine, defect)

Description

[Michael Daumling]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.10) Gecko/20050716 Firefox/1.0.6
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.10) Gecko/20050716 Firefox/1.0.6

If JS_EvaluateUCInStackFrame() is called from a debugger while the current stack
frame is inside a scripted function, neither local variables nor function
arguments are resolved.

Reproducible: Always

Steps to Reproduce:
1. Implement JS_EvaluateUCInStackFrame() as a scripted call as, say, frameEval()
2. Place that call into a JS function definition (see below)
3. Run the script

Actual Results:  
a is undefined

Expected Results:  
shold return the contents of a

When callin JS_GetFrameCallObject() before the call to
JS_EvaluateUCInStackFrame(), it forces the creation of the arguments and the
call object (they are probably created on demand), and
JS_EvaluateUCInStackFrame() needs these two objects to resolve local variables
and call arguments.

Sample script:

function testit (a) {
   return testEval("a");
}

testit ("hi world");

This script generates an error (assuming testEval() is implemented as a function
 that calls JS_EvaluateUSInStackFrame())

Comment 1

[Jim Blandy :jimb]

This works in current TM:

$ obj~/js -d
js> function t(a) { return evalInFrame(0, 'a'); }
js> t('hi world')
"hi world"
js>