[WebAssembly] Split EH MIR tests into two files

[aheejin]

Summary

Currently exception.mir runs LateEHPrepare and CFGStackify, but some
tests I'm planning to add shouldn't be run with LateEHPrepare, because
it is convenient to only run CFGStackify when testing things like unwind
mismatches and it is easier to add tests that are in phase right before
CFGStackify. This splits existing exception.mir into two files;
cfg-stackify-eh.mir will only run CFGStackify. Note that
eh_label_tests tests both LateEHPrepare and CFGStackify, so it is
still in exception.mir. rethrow_arg_tests has been converted to the
post-LateEHPrepare form to be moved into cfg-stackify-eh.mir, like
removing CATCHRET and such, because it does not really test anything
in LateEHPrepare.

[dschuff]

llvm/test/CodeGen/WebAssembly/cfg-stackify-eh.mir

32

would it make sense for this to be a CHECK-LABEL (or for it to be bb.1: including the colon) to make the match more precise?

[aheejin]

Added a colon after BB CHECK lines

[aheejin]

Add missing (landing-pad)

llvm/test/CodeGen/WebAssembly/cfg-stackify-eh.mir

32

Good idea. Added a colon to all BB CHECK lines.

llvm/test/CodeGen/WebAssembly/cfg-stackify-eh.mir

+# RUN: llc -mtriple=wasm32-unknown-unknown -exception-model=wasm -mattr=+exception-handling -run-pass wasm-cfg-stackify %s -o - | FileCheck %s
+
+--- |
+  target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
+  target triple = "wasm32-unknown-unknown"
+
+  declare i32 @__gxx_wasm_personality_v0(...)
+  declare void @foo()
+  define void @rethrow_arg_test() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
+    ret void
+  }
+...
+
+---
+# CHECK-LABEL: name: rethrow_arg_test
+name: rethrow_arg_test
+liveins:
+  - { reg: '$arguments' }
+body: |
+  bb.0:
+    successors: %bb.1, %bb.3
+    ; CHECK: bb.0:
+    ; CHECK: TRY
+    EH_LABEL <mcsymbol .Ltmp0>
+    CALL @foo, implicit-def dead $arguments, implicit $sp32, implicit $sp64
+    EH_LABEL <mcsymbol .Ltmp1>
+    BR %bb.3, implicit-def dead $arguments
+
+  bb.1 (landing-pad):
+    successors: %bb.2
+    ; CHECK: bb.1 (landing-pad):
+    ; CHECK: CATCH
+    ; CHECK: TRY
+    ; This RETHROW rethrows the exception caught by this BB's CATCH, but after
+    ; CFGStackify a TRY is placed between the CATCH and this RETHROW, so after
+    ; CFGStackify its immediate argument should become not 0, but 1.
+    ; CHECK: RETHROW 1
+    EH_LABEL <mcsymbol .Ltmp2>
+    %0:i32 = CATCH &__cpp_exception, implicit-def dead $arguments
+    RETHROW 0, implicit-def dead $arguments
+
+  bb.2 (landing-pad):
+    ; CHECK: bb.2 (landing-pad):
+    ; CHECK: CATCH
+    ; CHECK: RETHROW 0
+    EH_LABEL <mcsymbol .Ltmp5>
+    %1:i32 = CATCH &__cpp_exception, implicit-def dead $arguments
+    RETHROW 0, implicit-def dead $arguments
+
+  bb.3:
+    ; CHECK: bb.3:
+    ; CHECK: END_TRY
+    ; CHECK: END_TRY
+    RETURN implicit-def dead $arguments
+...

llvm/test/CodeGen/WebAssembly/exception.mir

 # RUN: llc -mtriple=wasm32-unknown-unknown -exception-model=wasm -mattr=+exception-handling -run-pass wasm-late-eh-prepare -run-pass wasm-cfg-stackify %s -o - | FileCheck %s
 
 --- |
   target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
   target triple = "wasm32-unknown-unknown"
 
   declare i32 @__gxx_wasm_personality_v0(...)
   declare void @foo()
   define void @eh_label_test() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
     ret void
   }
   define void @unreachable_ehpad_test() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
     ret void
   }
-  define void @rethrow_arg_test() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
-    ret void
-  }
 ...
 
 ---
 # This tests 'try' and 'catch' instructions are correctly placed with respect to
 # EH_LABEL instructions.
 # CHECK-LABEL: name: eh_label_test
 name: eh_label_test
 liveins:
bb.1 (landing-pad):
     EH_LABEL <mcsymbol .Ltmp2>
     CATCHRET %bb.2, %bb.1, implicit-def dead $arguments
 
   ; CHECK: bb.2
   bb.2:
   ; predecessors: %bb.0, %bb.1
     RETURN implicit-def dead $arguments
 ...
-
----
-# CHECK-LABEL: name: rethrow_arg_test
-name: rethrow_arg_test
-liveins:
-  - { reg: '$arguments' }
-body: |
-  bb.0:
-    successors: %bb.1, %bb.4
-    ; CHECK: bb.0
-    ; CHECK: TRY
-    EH_LABEL <mcsymbol .Ltmp0>
-    CALL @foo, implicit-def dead $arguments, implicit $sp32, implicit $sp64
-    EH_LABEL <mcsymbol .Ltmp1>
-    BR %bb.4, implicit-def dead $arguments
-
-  bb.1 (landing-pad):
-  ; predecessors: %bb.0
-    successors: %bb.2
-    ; CHECK: bb.1
-    ; CHECK: CATCH
-    ; CHECK: TRY
-    ; This RETHROW rethrows the exception caught by this BB's CATCH, but after
-    ; CFGStackify a TRY is placed between the CATCH and this RETHROW, so after
-    ; CFGStackify its immediate argument should become not 0, but 1.
-    ; CHECK: RETHROW 1
-    EH_LABEL <mcsymbol .Ltmp2>
-    %0:i32 = CATCH &__cpp_exception, implicit-def dead $arguments
-    RETHROW 0, implicit-def dead $arguments
-
-  bb.2 (landing-pad):
-  ; predecessors: %bb.1
-    successors: %bb.3
-    ; CHECK: bb.2
-    ; CHECK: CATCH
-    ; CHECK: RETHROW 0
-    EH_LABEL <mcsymbol .Ltmp5>
-    %1:i32 = CATCH &__cpp_exception, implicit-def dead $arguments
-    RETHROW 0, implicit-def dead $arguments
-    CATCHRET %bb.3, %bb.2, implicit-def dead $arguments
-
-  bb.3:
-  ; predecessors: %bb.2
-    successors: %bb.4
-    CATCHRET %bb.4, %bb.1, implicit-def dead $arguments
-
-  bb.4:
-  ; predecessors: %bb.0, %bb.3
-    ; CHECK: bb.4
-    ; CHECK: END_TRY
-    ; CHECK: END_TRY
-    RETURN implicit-def dead $arguments
-