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Summary: After instruction selection phase, possibly-throwing calls, which were previously invoke, are wrapped in `EH_LABEL` instructions. For example: ``` EH_LABEL <mcsymbol .Ltmp0> CALL_VOID @foo ... EH_LABEL <mcsymbol .Ltmp1> ``` `EH_LABEL` is placed also in the beginning of EH pads: ``` bb.1 (landing-pad): EH_LABEL <mcsymbol .Ltmp2> ... ``` And we'd like to maintian this relationship, so when we place a `try`, ``` TRY ... EH_LABEL <mcsymbol .Ltmp0> CALL_VOID @foo ... EH_LABEL <mcsymbol .Ltmp1> ``` When we place a `catch`, ``` bb.1 (landing-pad): EH_LABEL <mcsymbol .Ltmp2> %0:except_ref = CATCH ... ... ``` Previously we didn't treat EH_LABELs specially, so `try` was placed right before a call, and `catch` was placed in the beginning of an EH pad. Reviewers: dschuff Subscribers: sbc100, jgravelle-google, sunfish, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D58914 llvm-svn: 355996
47 lines
1.4 KiB
YAML
47 lines
1.4 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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# This tests 'try' and 'catch' instructions are correctly placed with respect to
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# EH_LABEL instructions.
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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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...
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---
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# CHECK-LABEL: 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: TRY
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; CHECK-NEXT: EH_LABEL
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; CHECK-NEXT: CALL_VOID @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_VOID @foo, implicit-def dead $arguments, implicit $sp32, implicit $sp64
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EH_LABEL <mcsymbol .Ltmp1>
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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 should be after an EH_LABEL at the beginning of an EH pad
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; CHECK: EH_LABEL
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; CHECK-NEXT: CATCH
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EH_LABEL <mcsymbol .Ltmp2>
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dead %0:i32 = EXTRACT_EXCEPTION_I32 implicit-def dead $arguments
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CATCHRET %bb.2, %bb.0, implicit-def dead $arguments
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bb.2:
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; predecessors: %bb.0, %bb.1
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RETURN_VOID implicit-def dead $arguments
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...
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