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Diffstat (limited to 'archive/3.transect/compiler7')
-rw-r--r-- | archive/3.transect/compiler7 | 46 |
1 files changed, 0 insertions, 46 deletions
diff --git a/archive/3.transect/compiler7 b/archive/3.transect/compiler7 deleted file mode 100644 index cf7d454f..00000000 --- a/archive/3.transect/compiler7 +++ /dev/null @@ -1,46 +0,0 @@ -== Goal - -A memory-safe language with a simple translator to x86 that can be feasibly written in x86. - -== Definitions of terms - -Memory-safe: it should be impossible to: - a) create a pointer out of arbitrary data, or - b) to access heap memory after it's been freed. - -Simple: do all the work in a 2-pass translator: - Pass 1: check each instruction's types in isolation. - Pass 2: emit code for each instruction in isolation. - -== types - -int -char -(address _ stack|heap|global) -(array _ n) # on stack or global -(ref _) -(ref array _) # by definition always on the heap - -addresses to global can be saved and manipulated as usual -addresses on stack can't be saved to heap -addresses on heap can't be saved to global (use ref) - -addresses to stack or heap can't be included in compound types - or used across a call - or used across a label - -<reg x> : (address T stack|global) <- advance <reg/mem> : (array T), <reg offset> : (index T) -<reg x> : (address T heap) <- advance *<mem> : (ref array T), <reg offset> : (index T) - -arrays require a size -(ref array _) may not include a size - -Arguments of type 'address' are required to be on the stack or global. Can't -be on the heap. - -So we need duplication for address and ref arguments? - -Argv has type (array (address (array char) global)) - -variables on stack, heap and global are references. The name points at the -address. Use '*' to get at the value. |