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Code Issues Packages Projects Releases 10 Wiki Activity

Global variables (#378)

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* global variables

* implemented type checking of global variable, added test case

* added a comment

* improvements based on Dave's suggestions

* improvements based on Jon's suggestions

* added test cases about global variable ordering
This commit is contained in:
Jeremy G. Siek
2021-03-15 16:06:27 -04:00
committed by GitHub
parent 41786eae25
commit ced98ef021
22 changed files with 822 additions and 3 deletions
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executable_semantics/testdata/global_variable4.golden
Vendored
+115
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@@ -0,0 +1,115 @@
********** source program **********
var Int : zero = 1
fn main () -> Int {
zero = 0;
return zero;
}
********** type checking **********
--- step exp Int --->
--- step exp Int --->
--- step exp Int --->
--- step exp Int --->
********** type checking complete **********
var Int : zero = 1
fn main () -> Int {
zero = 0;
return zero;
}
********** starting execution **********
********** initializing globals **********
--- step exp 1 --->
--- step exp () --->
********** calling main function **********
{
stack: top{main()<-1>}
heap: 1, fun<main>,
env: main: fun<main>, zero: 1,
}
--- step exp main() --->
{
stack: top{main<-1> :: main()<0>}
heap: 1, fun<main>,
env: main: fun<main>, zero: 1,
}
--- step exp main --->
{
stack: top{fun<main><-1> :: main()<0>}
heap: 1, fun<main>,
env: main: fun<main>, zero: 1,
}
--- handle value fun<main> with main()<1>(fun<main>,) --->
{
stack: top{()<-1> :: main()<1>(fun<main>,)}
heap: 1, fun<main>,
env: main: fun<main>, zero: 1,
}
--- step exp () --->
{
stack: top{()<-1> :: main()<1>(fun<main>,)}
heap: 1, fun<main>,
env: main: fun<main>, zero: 1,
}
--- handle value () with main()<2>(fun<main>,(),) --->
pattern_match((), ())
{
stack: main{zero = 0; ... <-1>} :: top{}
heap: 1, fun<main>,
env: main: fun<main>, zero: 1,
}
--- step stmt zero = 0; ... --->
{
stack: main{zero = 0;<-1> :: return zero;<-1>} :: top{}
heap: 1, fun<main>,
env: main: fun<main>, zero: 1,
}
--- step stmt zero = 0; --->
{
stack: main{zero<-1> :: zero = 0;<0> :: return zero;<-1>} :: top{}
heap: 1, fun<main>,
env: main: fun<main>, zero: 1,
}
--- step lvalue zero --->
{
stack: main{ptr<0><-1> :: zero = 0;<0> :: return zero;<-1>} :: top{}
heap: 1, fun<main>,
env: main: fun<main>, zero: 1,
}
--- handle value ptr<0> with zero = 0;<1>(ptr<0>,) --->
{
stack: main{0<-1> :: zero = 0;<1>(ptr<0>,) :: return zero;<-1>} :: top{}
heap: 1, fun<main>,
env: main: fun<main>, zero: 1,
}
--- step exp 0 --->
{
stack: main{0<-1> :: zero = 0;<1>(ptr<0>,) :: return zero;<-1>} :: top{}
heap: 1, fun<main>,
env: main: fun<main>, zero: 1,
}
--- handle value 0 with zero = 0;<2>(ptr<0>,0,) --->
{
stack: main{return zero;<-1>} :: top{}
heap: 0, fun<main>,
env: main: fun<main>, zero: 0,
}
--- step stmt return zero; --->
{
stack: main{zero<-1> :: return zero;<0>} :: top{}
heap: 0, fun<main>,
env: main: fun<main>, zero: 0,
}
--- step exp zero --->
{
stack: main{0<-1> :: return zero;<0>} :: top{}
heap: 0, fun<main>,
env: main: fun<main>, zero: 0,
}
--- handle value 0 with return zero;<1>(0,) --->
{
stack: top{0<-1>}
heap: 0, fun<main>,
env: main: fun<main>, zero: 0,
}
result: 0