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neaten

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John Kerl 2016-10-11 08:13:32 -04:00
parent e3d6f7cbe0
commit 9bc26d68e3
1 changed files with 18 additions and 2 deletions
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20
c/mapping/mlr_dsl_stack_allocate.c
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@ -47,10 +47,26 @@
// i = z; # LHS is local 4 at current level;
// # RHS is unresolved -> slot 0 at current level.
// } #
//
// Notes:
//
// * Pass 1 computes frame-relative indices and upstack-level counts,
// as in the example, for each local variable.
//
// * Pass 2 computes absolute indices for each local variable. These
// aren't computable in pass 1 due to the example 'b = 7' assignment
// above: the number of local variables in an upper level can change
// after the invocation of a child level, so total frame size is not
// known until all AST nodes in the top-level block have been visited.
//
// * Slot 0 of the top level is reserved for an absent-null for unresolved
// names on reads.
//
// * The tree-traversal order is done correctly so that if a variable is read
// before it is defined, then read again after it is defined, then the first
// read gets absent-null and the second gets the defined value.
// ================================================================
// xxx absent
// ----------------------------------------------------------------
// xxx to do: