36c64af9d7
If we are going to write handler data (that is written as variable length data following after the unwind info in .xdata), we need to emit the handler data immediately, but for cases where no such info is going to be written, skip emitting it right away. (Unwind info for all remaining functions that hasn't gotten it emitted directly is emitted at the end.) This does slightly change the ordering of sections (triggering a bunch of updates to DebugInfo/COFF tests), but the change should be benign. This also matches GCC's assembly output, which doesn't output .seh_handlerdata unless it actually is needed. For ARM64, the unwind info can be packed into the runtime function entry itself (leaving no data in the .xdata section at all), but that can only be done if there's no follow-on data in the .xdata section. If emission of the unwind info is triggered via EmitWinEHHandlerData (or the .seh_handlerdata directive), which implicitly switches to the .xdata section, there's a chance of the caller wanting to pass further data there, so the packed format can't be used in that case. Differential Revision: https://reviews.llvm.org/D87448
88 lines
2.5 KiB
LLVM
88 lines
2.5 KiB
LLVM
; RUN: llc -function-sections -mtriple=x86_64-windows-itanium < %s | FileCheck %s
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; RUN: llc -function-sections -mtriple=x86_64-windows-msvc < %s | FileCheck %s
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; RUN: llc -function-sections -mtriple=x86_64-w64-windows-gnu < %s | FileCheck %s --check-prefix=GNU
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; RUN: llc -function-sections -mtriple=i686-w64-windows-gnu < %s | FileCheck %s --check-prefix=GNU32
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; RUN: llc -function-sections -mtriple=x86_64-w64-windows-gnu < %s -filetype=obj | llvm-objdump - --headers | FileCheck %s --check-prefix=GNUOBJ
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; GCC and MSVC handle comdats completely differently. Make sure we do the right
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; thing for each.
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; Modeled on this C++ source, with additional modifications for
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; -ffunction-sections:
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; int bar(int);
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; __declspec(selectany) int gv = 42;
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; inline int foo(int x) { return bar(x) + gv; }
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; int main() { return foo(1); }
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$_Z3fooi = comdat any
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$gv = comdat any
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@gv = weak_odr dso_local global i32 42, comdat, align 4
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; Function Attrs: norecurse uwtable
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define dso_local i32 @main() #0 {
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entry:
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%call = tail call i32 @_Z3fooi(i32 1)
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ret i32 %call
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}
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; CHECK: .section .text,"xr",one_only,main
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; CHECK: main:
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; GNU: .section .text$main,"xr",one_only,main
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; GNU: main:
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; GNU32: .section .text$main,"xr",one_only,_main
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; GNU32: _main:
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define dso_local x86_fastcallcc i32 @fastcall(i32 %x, i32 %y) {
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%rv = add i32 %x, %y
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ret i32 %rv
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}
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; CHECK: .section .text,"xr",one_only,fastcall
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; CHECK: fastcall:
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; GNU: .section .text$fastcall,"xr",one_only,fastcall
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; GNU: fastcall:
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; GNU32: .section .text$fastcall,"xr",one_only,@fastcall@8
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; GNU32: @fastcall@8:
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; Function Attrs: inlinehint uwtable
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define linkonce_odr dso_local i32 @_Z3fooi(i32 %x) #1 comdat {
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entry:
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%call = tail call i32 @_Z3bari(i32 %x)
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%0 = load i32, i32* @gv, align 4
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%add = add nsw i32 %0, %call
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ret i32 %add
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}
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; CHECK: .section .text,"xr",discard,_Z3fooi
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; CHECK: _Z3fooi:
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; CHECK: .section .data,"dw",discard,gv
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; CHECK: gv:
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; CHECK: .long 42
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; GNU: .section .text$_Z3fooi,"xr",discard,_Z3fooi
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; GNU: _Z3fooi:
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; GNU: .section .data$gv,"dw",discard,gv
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; GNU: gv:
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; GNU: .long 42
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; GNU32: .section .text$_Z3fooi,"xr",discard,__Z3fooi
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; GNU32: __Z3fooi:
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; GNU32: .section .data$gv,"dw",discard,_gv
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; GNU32: _gv:
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; GNU32: .long 42
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; Make sure the assembler puts the .xdata and .pdata in sections with the right
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; names.
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; GNUOBJ: .text$_Z3fooi
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; GNUOBJ: .data$gv
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; GNUOBJ: .xdata$_Z3fooi
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; GNUOBJ: .pdata$_Z3fooi
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declare dso_local i32 @_Z3bari(i32)
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attributes #0 = { norecurse uwtable }
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attributes #1 = { inlinehint uwtable }
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