f049b2c3fc
This patch is essentially an alternative to https://reviews.llvm.org/D75836 and was mentioned by @lhames in a comment. The gist of the issue is that Mach-O has restrictions on which kind of sections are allowed after debug info has been emitted, which is also properly asserted within LLVM. Problem is that stack maps are currently emitted as one of the last sections in each target-specific AsmPrinter so far, which would cause the assertion to trigger. The current approach of special casing for the `__LLVM_STACKMAPS` section is not viable either, as downstream users can overwrite the stackmap format using plugins, which may want to use different sections. This patch fixes the issue by emitting the stack map earlier, right before debug info is emitted. The way this is implemented is by taking the choice when to emit the StackMap away from the target AsmPrinter and doing so in the base class. The only disadvantage of this approach is that the `StackMaps` member is now part of the base class, even for targets that do not support them. This is functionaly not a problem however, as emitting an empty `StackMaps` is a no-op. Differential Revision: https://reviews.llvm.org/D132708
29 lines
1.2 KiB
LLVM
29 lines
1.2 KiB
LLVM
; RUN: llc -verify-machineinstrs < %s | FileCheck %s
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; Used to crash with assertions when emitting object files.
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; RUN: llc -filetype=obj %s -o /dev/null
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; Check stack map section is emitted before debug info.
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; CHECK: .section __LLVM_STACKMAPS
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; CHECK: .section __DWARF
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target triple = "x86_64-apple-macosx12.0"
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declare void @func()
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define ptr addrspace(1) @test1(ptr addrspace(1) %arg) gc "statepoint-example" {
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entry:
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%safepoint_token = call token (i64, i32, ptr, i32, i32, ...) @llvm.experimental.gc.statepoint.p0(i64 0, i32 0, ptr elementtype(void ()) @func, i32 0, i32 0, i32 0, i32 0) ["gc-live"(ptr addrspace(1) %arg)]
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%reloc1 = call ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token %safepoint_token, i32 0, i32 0)
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ret ptr addrspace(1) %reloc1
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}
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declare token @llvm.experimental.gc.statepoint.p0(i64, i32, ptr, i32, i32, ...)
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declare ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token, i32, i32)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!2}
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!0 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "clang", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !{}, retainedTypes: !{})
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!1 = !DIFile(filename: "t.c", directory: "")
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!2 = !{i32 2, !"Debug Info Version", i32 3}
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