35f5f797a6
Previously we assumed `rethrow`'s argument was always 0, but it turned out `rethrow` follows the same rule with `br` or `delegate`: https://github.com/WebAssembly/exception-handling/pull/137 https://github.com/WebAssembly/exception-handling/issues/146#issuecomment-777349038 Currently `rethrow`s generated by our backend always rethrow the exception caught by the innermost enclosing catch, so this adds a function to compute that and replaces `rethrow`'s argument with its computed result. This also renames `EHPadStack` in `InstPrinter` to `TryStack`, because in CFGStackify we use `EHPadStack` to mean the range between `catch`~`end`, while in `InstPrinter` we used it to mean the range between `try`~`catch`, so choosing different names would look clearer. Doesn't contain any functional changes in `InstPrinter`. Reviewed By: dschuff Differential Revision: https://reviews.llvm.org/D96595
133 lines
3.7 KiB
YAML
133 lines
3.7 KiB
YAML
# 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
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--- |
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target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
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target triple = "wasm32-unknown-unknown"
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declare i32 @__gxx_wasm_personality_v0(...)
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declare void @foo()
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define void @eh_label_test() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
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ret void
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}
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define void @unreachable_ehpad_test() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
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ret void
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}
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define void @rethrow_arg_test() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
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ret void
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}
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...
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---
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# This tests 'try' and 'catch' instructions are correctly placed with respect to
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# EH_LABEL instructions.
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# CHECK-LABEL: name: eh_label_test
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name: eh_label_test
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liveins:
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- { reg: '$arguments' }
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body: |
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bb.0:
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; TRY should be before EH_LABEL wrappers of throwing calls
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; CHECK: bb.0
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; CHECK: TRY
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; CHECK-NEXT: EH_LABEL
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; CHECK-NEXT: CALL @foo
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; CHECK-NEXT: EH_LABEL
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successors: %bb.1, %bb.2
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EH_LABEL <mcsymbol .Ltmp0>
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CALL @foo, implicit-def dead $arguments, implicit $sp32, implicit $sp64
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EH_LABEL <mcsymbol .Ltmp1>
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BR %bb.2, implicit-def dead $arguments
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bb.1 (landing-pad):
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; predecessors: %bb.0
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successors: %bb.2
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; CATCH_ALL should be after an EH_LABEL at the beginning of an EH pad
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; CHECK: bb.1
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; CHECK: EH_LABEL
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; CHECK-NEXT: CATCH_ALL
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EH_LABEL <mcsymbol .Ltmp2>
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CATCHRET %bb.2, %bb.1, implicit-def dead $arguments
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bb.2:
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; predecessors: %bb.0, %bb.1
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RETURN implicit-def dead $arguments
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...
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---
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# Unreachable EH pads should be removed by LateEHPrepare.
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# CHECK-LABEL: name: unreachable_ehpad_test
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name: unreachable_ehpad_test
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liveins:
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- { reg: '$arguments' }
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body: |
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; CHECK: bb.0
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bb.0:
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successors: %bb.2
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BR %bb.2, implicit-def dead $arguments
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; This EH pad is unreachable, so it should be removed by LateEHPrepare
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; CHECK-NOT: bb.1 (landing-pad)
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bb.1 (landing-pad):
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successors: %bb.2
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EH_LABEL <mcsymbol .Ltmp2>
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CATCHRET %bb.2, %bb.1, implicit-def dead $arguments
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; CHECK: bb.2
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bb.2:
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; predecessors: %bb.0, %bb.1
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RETURN implicit-def dead $arguments
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...
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---
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# CHECK-LABEL: name: rethrow_arg_test
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name: rethrow_arg_test
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liveins:
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- { reg: '$arguments' }
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body: |
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bb.0:
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successors: %bb.1, %bb.4
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; CHECK: bb.0
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; CHECK: TRY
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EH_LABEL <mcsymbol .Ltmp0>
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CALL @foo, implicit-def dead $arguments, implicit $sp32, implicit $sp64
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EH_LABEL <mcsymbol .Ltmp1>
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BR %bb.4, implicit-def dead $arguments
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bb.1 (landing-pad):
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; predecessors: %bb.0
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successors: %bb.2
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; CHECK: bb.1
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; CHECK: CATCH
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; CHECK: TRY
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; This RETHROW rethrows the exception caught by this BB's CATCH, but after
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; CFGStackify a TRY is placed between the CATCH and this RETHROW, so after
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; CFGStackify its immediate argument should become not 0, but 1.
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; CHECK: RETHROW 1
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EH_LABEL <mcsymbol .Ltmp2>
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%0:i32 = CATCH &__cpp_exception, implicit-def dead $arguments
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RETHROW 0, implicit-def dead $arguments
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bb.2 (landing-pad):
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; predecessors: %bb.1
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successors: %bb.3
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; CHECK: bb.2
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; CHECK: CATCH
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; CHECK: RETHROW 0
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EH_LABEL <mcsymbol .Ltmp5>
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%1:i32 = CATCH &__cpp_exception, implicit-def dead $arguments
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RETHROW 0, implicit-def dead $arguments
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CATCHRET %bb.3, %bb.2, implicit-def dead $arguments
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bb.3:
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; predecessors: %bb.2
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successors: %bb.4
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CATCHRET %bb.4, %bb.1, implicit-def dead $arguments
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bb.4:
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; predecessors: %bb.0, %bb.3
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; CHECK: bb.4
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; CHECK: END_TRY
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; CHECK: END_TRY
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RETURN implicit-def dead $arguments
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