In some cases, the global character of a value was lost, leading to
undefined behaviour. Now a node level field of -1 means that the value
is global, and that it should be accessed from the root data frame.
Fixes#993.
As opposed to other symbols, goto labels must be searched in included
scopes, not upper ones. Implement scope.lookdown to perform this,
to allow calls to goto to be embedded in included scopes where label
is defined.
Fixes#953.
Perform function declaration type check from the upper level scope (the scope where the
function is declared), to avoid possible collisions of local variables with package names.
Fixes#957.
* fix: untyped constant cconverson to default type
In definition assign expression, the source type is propagated to
the assigned value. If the source is an untyped constant, the
destination type must be set to the default type of the constant
definition. A fixType function is provided to perform this.
In addition, the type conversion and check of constants is
refactored for simplifications.
Fixes#727.
* test: fix _test/const14.go
* feat: add support for named output variables
Function output parameters are located at the start of the function
frame, uninitialized, as they could be only set through return
statements.
Supporting named output variables requires to:
- identify and allocate symbols corresponding to output names:
done at ident parsing, with the funcRet() helper,
- compute the location of output name in the frame:
done with retRank() helper,
- initialize the frame entry with the zero value of symbol type,
as the symbol can be accessed and written at multiple times,
and return not setting the variable (opposite to unnamed).
Done with frameType() helper, which now takes into account
output parameters.
* refactor: simplify memory management
Perform function frame analysis at pre-order, instead of post-order, to
initialize memory frame, and track value types. Remove all operation
involving unitialized types. Frame memory layout is now build
incrementally, instead of having to perform dedicated tree walks on AST.
