6420f37926
Instead of maintaining per-function-invocation malloc()'ed tables to track which functions each label belongs to, store the equivalent info in jump buffers (jmp_buf) themselves.
Also, use a less emscripten-looking ABI symbols:
```
saveSetjmp -> __wasm_setjmp
testSetjmp -> __wasm_setjmp_test
getTempRet0 -> (removed)
__wasm_longjmp -> (no change)
```
While I want to use this for WASI, it should work for emscripten as well.
An example runtime and a few tests:
https://github.com/yamt/garbage/tree/wasm-sjlj-alt2/wasm/longjmp
wasi-libc version of the runtime:
https://github.com/WebAssembly/wasi-libc/pull/483
emscripten version of the runtime:
https://github.com/emscripten-core/emscripten/pull/21502
Discussion:
https://docs.google.com/document/d/1ZvTPT36K5jjiedF8MCXbEmYjULJjI723aOAks1IdLLg/edit
59 lines
1.9 KiB
LLVM
59 lines
1.9 KiB
LLVM
; RUN: opt < %s -wasm-lower-em-ehsjlj -enable-emscripten-sjlj -S | FileCheck %s
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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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; Basic debug info test. All existing instructions have debug info and inserted
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; 'malloc' and 'free' calls take debug info from the next instruction.
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define void @setjmp_debug_info0() !dbg !3 {
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; CHECK-LABEL: @setjmp_debug_info0
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entry:
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%buf = alloca [1 x %struct.__jmp_buf_tag], align 16, !dbg !4
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%arraydecay = getelementptr inbounds [1 x %struct.__jmp_buf_tag], ptr %buf, i32 0, i32 0, !dbg !5
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%call = call i32 @setjmp(ptr %arraydecay) #0, !dbg !6
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call void @foo(), !dbg !7
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ret void, !dbg !8
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; CHECK: entry:
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; CHECK-NEXT: %functionInvocationId = alloca i32, align 4, !dbg ![[DL0:.*]]
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; CHECK: entry.split:
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; CHECK: alloca {{.*}}, !dbg ![[DL0]]
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; CHECK: call void @__wasm_setjmp{{.*}}, !dbg ![[DL1:.*]]
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; CHECK-NEXT: br {{.*}}, !dbg ![[DL2:.*]]
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; CHECK: entry.split.split:
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; CHECK: call {{.*}} void @__invoke_void{{.*}}, !dbg ![[DL2]]
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; CHECK: entry.split.split.split:
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; CHECK: if.then1:
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; CHECK: call i32 @__wasm_setjmp_test{{.*}}, !dbg ![[DL2]]
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; CHECK: if.end:
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; CHECK: call.em.longjmp:
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; CHECK: call void @emscripten_longjmp{{.*}}, !dbg ![[DL2]]
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; CHECK: if.end2:
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; CHECK: call void @setTempRet0{{.*}}, !dbg ![[DL2]]
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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(ptr) #0
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!0}
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!0 = !{i32 2, !"Debug Info Version", i32 3}
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!1 = !DIFile(filename: "lower-em-sjlj.c", directory: "test")
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1)
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!3 = distinct !DISubprogram(name: "setjmp_debug_info0", unit:!2, file: !1, line: 1)
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!4 = !DILocation(line:2, scope: !3)
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!5 = !DILocation(line:3, scope: !3)
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!6 = !DILocation(line:4, scope: !3)
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!7 = !DILocation(line:5, scope: !3)
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!8 = !DILocation(line:6, scope: !3)
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