8000 Dargent ignores field if not in layout. · Issue #311 · au-ts/cogent · GitHub
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Dargent ignores field if not in layout. 8000 #311

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gteege opened this issue Nov 12, 2019 · 1 comment
Open

Dargent ignores field if not in layout. #311

gteege opened this issue Nov 12, 2019 · 1 comment
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bug dargent WIP

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@gteege
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gteege commented Nov 12, 2019

The code

type R = {a: U32, b: U32} layout record {a: 4B at 0B }
f: R -> R
f x = x{a=5}

compiles successfully but creates a C datatype

struct t1 { unsigned int data[1U]; } ;

i.e., the b field is silently ignored.
When the field is used afterwards, the compiler crashes:

type R = {a: U32, b: U32} layout record {a: 4B at 0B }
f: R -> R
f x = x{a=5,b=7}

causes the error message

cogent -g put-nonlayout-field.cogent 
Parsing...
Resolving dependencies...
Typechecking...
Desugaring and typing...
Normalising...ANF
Re-typing NF...
Simplifying...
Skipped
Monomorphising...
Re-typing monomorphic AST...
Generating C code...
  > Writing to file: ./put-nonlayout-field.h
cogent: Map.!: given key is not an element in the map
CallStack (from HasCallStack):
  error, called at libraries/containers/Data/Map/Internal.hs:610:17 in containers-0.6.0.1:Data.Map.Internal
@zilinc
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zilinc commented Nov 12, 2019

@ccapitalK Your implementation should fix this, right?

@zilinc zilinc mentioned this issue Nov 21, 2019
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@zilinc @ccapitalK @gteege
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