163 lines
6.1 KiB
LLVM
163 lines
6.1 KiB
LLVM
; RUN: opt < %s -wasm-lower-em-ehsjlj -S | FileCheck %s
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; RUN: llc < %s -verify-machineinstrs
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; Tests for cases when exception handling and setjmp/longjmp handling are mixed.
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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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%struct.__jmp_buf_tag = type { [6 x i32], i32, [32 x i32] }
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; There is a function call (@foo) that can either throw an exception or longjmp
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; and there is also a setjmp call. When @foo throws, we have to check both for
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; exception and longjmp and jump to exception or longjmp handling BB depending
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; on the result.
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define void @setjmp_longjmp_exception() personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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; CHECK-LABEL: @setjmp_longjmp_exception
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entry:
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%buf = alloca [1 x %struct.__jmp_buf_tag], align 16
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%arraydecay = getelementptr inbounds [1 x %struct.__jmp_buf_tag], [1 x %struct.__jmp_buf_tag]* %buf, i32 0, i32 0
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%call = call i32 @setjmp(%struct.__jmp_buf_tag* %arraydecay) #0
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invoke void @foo()
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to label %try.cont unwind label %lpad
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; CHECK: entry.split:
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; CHECK: %[[CMP0:.*]] = icmp ne i32 %__THREW__.val, 0
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; CHECK-NEXT: %__threwValue.val = load i32, i32* @__threwValue
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; CHECK-NEXT: %[[CMP1:.*]] = icmp ne i32 %__threwValue.val, 0
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; CHECK-NEXT: %[[CMP:.*]] = and i1 %[[CMP0]], %[[CMP1]]
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; CHECK-NEXT: br i1 %[[CMP]], label %if.then1, label %if.else1
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; This is exception checking part. %if.else1 leads here
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; CHECK: entry.split.split:
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; CHECK-NEXT: %[[CMP:.*]] = icmp eq i32 %__THREW__.val, 1
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; CHECK-NEXT: br i1 %[[CMP]], label %lpad, label %try.cont
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; longjmp checking part
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; CHECK: if.then1:
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; CHECK: call i32 @testSetjmp
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lpad: ; preds = %entry
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%0 = landingpad { i8*, i32 }
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catch i8* null
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%1 = extractvalue { i8*, i32 } %0, 0
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%2 = extractvalue { i8*, i32 } %0, 1
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%3 = call i8* @__cxa_begin_catch(i8* %1) #2
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call void @__cxa_end_catch()
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br label %try.cont
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try.cont: ; preds = %entry, %lpad
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ret void
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}
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; @foo can either throw an exception or longjmp. Because this function doesn't
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; have any setjmp calls, we only handle exceptions in this function. But because
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; sjlj is enabled, we check if the thrown value is longjmp and if so rethrow it
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; by calling @emscripten_longjmp.
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define void @rethrow_longjmp() personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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; CHECK-LABEL: @rethrow_longjmp
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entry:
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invoke void @foo()
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to label %try.cont unwind label %lpad
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; CHECK: entry:
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; CHECK: %cmp.eq.one = icmp eq i32 %__THREW__.val, 1
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; CHECK-NEXT: %cmp.eq.zero = icmp eq i32 %__THREW__.val, 0
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; CHECK-NEXT: %or = or i1 %cmp.eq.zero, %cmp.eq.one
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; CHECK-NEXT: br i1 %or, label %tail, label %longjmp.rethrow
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; CHECK: tail:
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; CHECK-NEXT: %cmp = icmp eq i32 %__THREW__.val, 1
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; CHECK-NEXT: br i1 %cmp, label %lpad, label %try.cont
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; CHECK: longjmp.rethrow:
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; CHECK-NEXT: %__threwValue.val = load i32, i32* @__threwValue, align 4
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; CHECK-NEXT: call void @emscripten_longjmp(i32 %__THREW__.val, i32 %__threwValue.val)
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; CHECK-NEXT: unreachable
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lpad: ; preds = %entry
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%0 = landingpad { i8*, i32 }
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catch i8* null
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%1 = extractvalue { i8*, i32 } %0, 0
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%2 = extractvalue { i8*, i32 } %0, 1
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%3 = call i8* @__cxa_begin_catch(i8* %1) #5
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call void @__cxa_end_catch()
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br label %try.cont
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try.cont: ; preds = %entry, %lpad
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ret void
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}
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; This function contains a setjmp call and no invoke, so we only handle longjmp
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; here. But @foo can also throw an exception, so we check if an exception is
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; thrown and if so rethrow it by calling @__resumeException. Also we have to
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; free the setjmpTable buffer before calling @__resumeException.
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define void @rethrow_exception() {
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; CHECK-LABEL: @rethrow_exception
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entry:
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%buf = alloca [1 x %struct.__jmp_buf_tag], align 16
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%arraydecay = getelementptr inbounds [1 x %struct.__jmp_buf_tag], [1 x %struct.__jmp_buf_tag]* %buf, i32 0, i32 0
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%call = call i32 @setjmp(%struct.__jmp_buf_tag* %arraydecay) #0
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%cmp = icmp ne i32 %call, 0
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br i1 %cmp, label %return, label %if.end
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if.end: ; preds = %entry
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call void @foo()
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br label %return
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; CHECK: if.end:
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; CHECK: %cmp.eq.one = icmp eq i32 %__THREW__.val, 1
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; CHECK-NEXT: br i1 %cmp.eq.one, label %eh.rethrow, label %normal
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; CHECK: normal:
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; CHECK-NEXT: icmp ne i32 %__THREW__.val, 0
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; CHECK: eh.rethrow:
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; CHECK-NEXT: %exn = call i8* @__cxa_find_matching_catch_2()
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; CHECK-NEXT: %[[BUF:.*]] = bitcast i32* %setjmpTable1 to i8*
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; CHECK-NEXT: call void @free(i8* %[[BUF]])
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; CHECK-NEXT: call void @__resumeException(i8* %exn)
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; CHECK-NEXT: unreachable
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return: ; preds = %entry, %if.end
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ret void
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}
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; The same as 'rethrow_exception' but contains a __cxa_throw call. We have to
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; free the setjmpTable buffer before calling __cxa_throw.
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define void @rethrow_exception2() {
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; CHECK-LABEL: @rethrow_exception2
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entry:
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%buf = alloca [1 x %struct.__jmp_buf_tag], align 16
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%arraydecay = getelementptr inbounds [1 x %struct.__jmp_buf_tag], [1 x %struct.__jmp_buf_tag]* %buf, i32 0, i32 0
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%call = call i32 @setjmp(%struct.__jmp_buf_tag* %arraydecay) #0
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%cmp = icmp ne i32 %call, 0
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br i1 %cmp, label %throw, label %if.end
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if.end: ; preds = %entry
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call void @foo()
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br label %throw
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throw: ; preds = %entry, %if.end
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call void @__cxa_throw(i8* null, i8* null, i8* null) #1
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unreachable
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; CHECK: throw:
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; CHECK: %[[BUF:.*]] = bitcast i32* %setjmpTable5 to i8*
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; CHECK-NEXT: call void @free(i8* %[[BUF]])
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; CHECK-NEXT: call void @__cxa_throw(i8* null, i8* null, i8* null)
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; CHECK-NEXT: unreachable
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}
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declare void @foo()
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; Function Attrs: returns_twice
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declare i32 @setjmp(%struct.__jmp_buf_tag*)
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; Function Attrs: noreturn
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declare void @longjmp(%struct.__jmp_buf_tag*, i32)
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declare i32 @__gxx_personality_v0(...)
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declare i8* @__cxa_begin_catch(i8*)
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declare void @__cxa_end_catch()
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declare void @__cxa_throw(i8*, i8*, i8*)
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attributes #0 = { returns_twice }
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attributes #1 = { noreturn }
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