[interpreter/tests] Switch to Option B' (WebAssembly#285)

* Reintroduce exnref

* Fix type_of

* Simplify parser

* Implement 1b

* Change opcodes for catch/catch_all to avoid conflict

* Put catch clauses first

* Remove obsolete Delegating cases

* Change exn type opcode to -0x17

* Switch to B' variant

* [interpreter] Add boilerplate for ref.exn result patterns

* [ci] Deactivate node run, since it can't handle try_table yet

* Try -> TryTable in AST

* [spec] Update spec for option B' (WebAssembly#283)

* Deactivate Bikeshed

* [spec/tests] Specification of legacy exceptions + tests (WebAssembly#284)

* [legacy] Create specification doc for legacy exception handling

* [test] Create infra for legacy tests

.github/workflows/ci-interpreter.yml

@@ -31,4 +31,6 @@ jobs:
       - name: Build interpreter
         run: cd interpreter && opam exec make
       - name: Run tests
-        run: cd interpreter && opam exec make JS='node --experimental-wasm-return_call' ci
+        # Node can't handle the new instructions yet
+        # run: cd interpreter && opam exec make JS='node --experimental-wasm-return_call' ci
+        run: cd interpreter && opam exec make ci

.github/workflows/ci-spec.yml

@@ -32,8 +32,9 @@ jobs:
         run: pip install six && pip install sphinx==5.1.0
       - name: Build main spec
         run: cd document/core && make main
-      - name: Run Bikeshed
-        run: cd document/core && make bikeshed
+      # Deactivate broken Bikeshed build for the time being
+      #- name: Run Bikeshed
+      #  run: cd document/core && make bikeshed
       - name: Upload artifact
         uses: actions/upload-artifact@v2
         with:

document/Makefile

@@ -1,4 +1,4 @@
-DIRS     = core js-api web-api
+DIRS     = core js-api web-api legacy/exceptions
 FILES    = index.html
 BUILDDIR = _build
 

document/core/appendix/changes.rst

@@ -147,9 +147,9 @@ Added tag definitions, imports, and exports, and instructions to throw and catch
 
 * Modules may :ref:`define <syntax-tagtype>`, :ref:`import <syntax-import>`, and :ref:`export <syntax-export>` tags.
 
-* New exception throwing :ref:`control instructions <syntax-instr-control>`: :math:`\THROW` and :math:`\RETHROW`.
+* New :ref:`reference type <syntax-reftype>` |EXNREF|.
 
-* New handler :ref:`control instructions <syntax-instr-control>`: :math:`(\TRY~\X{bt}~\instr_1^\ast~(\CATCH~x~\instr_2^\ast)^\ast~(\CATCHALL~\instr_3^\ast)^?\END)` and :math:`(\TRY~\X{bt}~\instr^\ast~\DELEGATE~l)`.
+* New :ref:`control instructions <syntax-instr-control>`: |THROW|, |THROWREF|, and |TRYTABLE|.
 
 * New :ref:`tag section <binary-tagsec>` in binary format.
 

document/core/appendix/index-instructions.py

@@ -85,11 +85,11 @@ def Instruction(name, opcode, type=None, validation=None, execution=None, operat
     Instruction(r'\LOOP~\X{bt}', r'\hex{03}', r'[t_1^\ast] \to [t_2^\ast]', r'valid-loop', r'exec-loop'),
     Instruction(r'\IF~\X{bt}', r'\hex{04}', r'[t_1^\ast~\I32] \to [t_2^\ast]', r'valid-if', r'exec-if'),
     Instruction(r'\ELSE', r'\hex{05}'),
-    Instruction(r'\TRY~\X{bt}', r'\hex{06}', r'[t_1^\ast] \to [t_2^\ast]', r'valid-try-catch', r'exec-try-catch', None, r'valid-try-delegate', r'exec-try-delegate'),
-    Instruction(r'\CATCH~x', r'\hex{07}'),
+    Instruction(None, r'\hex{06}'),
+    Instruction(None, r'\hex{07}'),
     Instruction(r'\THROW~x', r'\hex{08}', r'[t_1^\ast~t_x^\ast] \to [t_2^\ast]', r'valid-throw', r'exec-throw'),
-    Instruction(r'\RETHROW~n', r'\hex{09}', r'[t_1^\ast] \to [t_2^\ast]', r'valid-rethrow', r'exec-rethrow'),
-    Instruction(None, r'\hex{0A}'),
+    Instruction(None, r'\hex{09}'),
+    Instruction(r'\THROWREF', r'\hex{0A}', r'[t_1^\ast~(\REF~\NULL~\EXN)] \to [t_2^\ast]', r'valid-throw_ref', r'exec-throw_ref'),
     Instruction(r'\END', r'\hex{0B}'),
     Instruction(r'\BR~l', r'\hex{0C}', r'[t_1^\ast~t^\ast] \to [t_2^\ast]', r'valid-br', r'exec-br'),
     Instruction(r'\BRIF~l', r'\hex{0D}', r'[t^\ast~\I32] \to [t^\ast]', r'valid-br_if', r'exec-br_if'),
@@ -103,14 +103,14 @@ def Instruction(name, opcode, type=None, validation=None, execution=None, operat
     Instruction(None, r'\hex{15}'),
     Instruction(None, r'\hex{16}'),
     Instruction(None, r'\hex{17}'),
-    Instruction(r'\DELEGATE~l', r'\hex{18}'),
-    Instruction(r'\CATCHALL', r'\hex{19}', None, r'valid-try-catch', r'exec-try-catch'),
+    Instruction(None, r'\hex{18}'),
+    Instruction(None, r'\hex{19}'),
     Instruction(r'\DROP', r'\hex{1A}', r'[t] \to []', r'valid-drop', r'exec-drop'),
     Instruction(r'\SELECT', r'\hex{1B}', r'[t~t~\I32] \to [t]', r'valid-select', r'exec-select'),
     Instruction(r'\SELECT~t', r'\hex{1C}', r'[t~t~\I32] \to [t]', r'valid-select', r'exec-select'),
     Instruction(None, r'\hex{1D}'),
     Instruction(None, r'\hex{1E}'),
-    Instruction(None, r'\hex{1F}'),
+    Instruction(r'\TRYTABLE~\X{bt}', r'\hex{1F}', r'[t_1^\ast] \to [t_2^\ast]', r'valid-try_table', r'exec-try_table'),
     Instruction(r'\LOCALGET~x', r'\hex{20}', r'[] \to [t]', r'valid-local.get', r'exec-local.get'),
     Instruction(r'\LOCALSET~x', r'\hex{21}', r'[t] \to []', r'valid-local.set', r'exec-local.set'),
     Instruction(r'\LOCALTEE~x', r'\hex{22}', r'[t] \to [t]', r'valid-local.tee', r'exec-local.tee'),

document/core/appendix/index-rules.rst

@@ -23,6 +23,7 @@ Construct                                        Judgement
 :ref:`External type <valid-externtype>`          :math:`\vdashexterntype \externtype \ok`
 :ref:`Instruction <valid-instr>`                 :math:`S;C \vdashinstr \instr : \stacktype`
 :ref:`Instruction sequence <valid-instr-seq>`    :math:`S;C \vdashinstrseq \instr^\ast : \stacktype`
+:ref:`Catch clause <valid-catch>`                :math:`C \vdashcatch \catch \ok`
 :ref:`Expression <valid-expr>`                   :math:`C \vdashexpr \expr : \resulttype`
 :ref:`Function <valid-func>`                     :math:`C \vdashfunc \func : \functype`
 :ref:`Table <valid-table>`                       :math:`C \vdashtable \table : \tabletype`

document/core/appendix/index-types.rst

@@ -16,7 +16,9 @@ Category                                  Constructor
 (reserved)                                                                             :math:`\hex{7A}` .. :math:`\hex{71}`
 :ref:`Reference type <syntax-reftype>`    |FUNCREF|                                    :math:`\hex{70}` (-16 as |Bs7|)
 :ref:`Reference type <syntax-reftype>`    |EXTERNREF|                                  :math:`\hex{6F}` (-17 as |Bs7|)
-(reserved)                                                                             :math:`\hex{6E}` .. :math:`\hex{61}`
+(reserved)                                                                             :math:`\hex{6E}` .. :math:`\hex{6A}`
+:ref:`Reference type <syntax-reftype>`    |EXNREF|                                     :math:`\hex{69}` (-23 as |Bs7|)
+(reserved)                                                                             :math:`\hex{68}` .. :math:`\hex{61}`
 :ref:`Function type <syntax-functype>`    :math:`[\valtype^\ast] \to [\valtype^\ast]`  :math:`\hex{60}` (-32 as |Bs7|)
 (reserved)                                                                             :math:`\hex{5F}` .. :math:`\hex{41}`
 :ref:`Result type <syntax-resulttype>`    :math:`[\epsilon]`                           :math:`\hex{40}` (-64 as |Bs7|)