maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
llvm-project/llvm/test/CodeGen/X86/push-cfi-debug.ll

54 lines
1.7 KiB
LLVM
Raw Normal View History

[X86] Generate .cfi_adjust_cfa_offset correctly when pushing arguments When push instructions are being used to pass function arguments on the stack, and either EH or debugging are enabled, we need to generate .cfi_adjust_cfa_offset directives appropriately. For (synch) EH, it is enough for the CFA offset to be correct at every call site, while for debugging we want to be correct after every push. Darwin does not support this well, so don't use pushes whenever it would be required. Differential Revision: http://reviews.llvm.org/D13767 llvm-svn: 251904
2015-11-03 16:17:25 +08:00
; RUN: llc < %s -mtriple=i686-pc-linux | FileCheck %s
; Function Attrs: optsize
declare void @foo(i32, i32) #0
declare x86_stdcallcc void @stdfoo(i32, i32) #0
; CHECK-LABEL: test1:
; CHECK: subl $8, %esp
; CHECK: .cfi_adjust_cfa_offset 8
; CHECK: pushl $2
; CHECK: .cfi_adjust_cfa_offset 4
; CHECK: pushl $1
; CHECK: .cfi_adjust_cfa_offset 4
; CHECK: calll foo
; CHECK: addl $16, %esp
; CHECK: .cfi_adjust_cfa_offset -16
; CHECK: subl $8, %esp
; CHECK: .cfi_adjust_cfa_offset 8
; CHECK: pushl $4
; CHECK: .cfi_adjust_cfa_offset 4
; CHECK: pushl $3
; CHECK: .cfi_adjust_cfa_offset 4
; CHECK: calll stdfoo
; CHECK: .cfi_adjust_cfa_offset -8
Re-commit r265039 "[X86] Merge adjacent stack adjustments in eliminateCallFramePseudoInstr (PR27140)" Third time's the charm? The previous attempt (r265345) caused ASan test failures on X86, as broken CFI caused stack traces to not work. This version of the patch makes sure not to merge with stack adjustments that have CFI, and to not add merged instructions' offests to the CFI about to be generated. This is already covered by the lit tests; I just got the expectations wrong previously. llvm-svn: 265623
2016-04-07 08:05:49 +08:00
; CHECK: addl $20, %esp
Revert "Re-commit r265039 "[X86] Merge adjacent stack adjustments in eliminateCallFramePseudoInstr (PR27140)"" It seems to be causing ASan tests to crash, probably due to miscompiling the run-time somehow. llvm-svn: 265551
2016-04-07 00:10:20 +08:00
; CHECK: .cfi_adjust_cfa_offset -8
DI: Reverse direction of subprogram -> function edge. Previously, subprograms contained a metadata reference to the function they described. Because most clients need to get or set a subprogram for a given function rather than the other way around, this created unneeded inefficiency. For example, many passes needed to call the function llvm::makeSubprogramMap() to build a mapping from functions to subprograms, and the IR linker needed to fix up function references in a way that caused quadratic complexity in the IR linking phase of LTO. This change reverses the direction of the edge by storing the subprogram as function-level metadata and removing DISubprogram's function field. Since this is an IR change, a bitcode upgrade has been provided. Fixes PR23367. An upgrade script for textual IR for out-of-tree clients is attached to the PR. Differential Revision: http://reviews.llvm.org/D14265 llvm-svn: 252219
2015-11-06 06:03:56 +08:00
define void @test1() #0 !dbg !4 {
[X86] Generate .cfi_adjust_cfa_offset correctly when pushing arguments When push instructions are being used to pass function arguments on the stack, and either EH or debugging are enabled, we need to generate .cfi_adjust_cfa_offset directives appropriately. For (synch) EH, it is enough for the CFA offset to be correct at every call site, while for debugging we want to be correct after every push. Darwin does not support this well, so don't use pushes whenever it would be required. Differential Revision: http://reviews.llvm.org/D13767 llvm-svn: 251904
2015-11-03 16:17:25 +08:00
entry:
tail call void @foo(i32 1, i32 2) #1, !dbg !10
tail call x86_stdcallcc void @stdfoo(i32 3, i32 4) #1, !dbg !11
ret void, !dbg !12
}
attributes #0 = { nounwind optsize }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!7, !8}
!llvm.ident = !{!9}
testcase gardening: update the emissionKind enum to the new syntax. (NFC) llvm-svn: 265081
2016-04-01 08:16:49 +08:00
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.8.0 (trunk 250289)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, subprograms: !3)
[X86] Generate .cfi_adjust_cfa_offset correctly when pushing arguments When push instructions are being used to pass function arguments on the stack, and either EH or debugging are enabled, we need to generate .cfi_adjust_cfa_offset directives appropriately. For (synch) EH, it is enough for the CFA offset to be correct at every call site, while for debugging we want to be correct after every push. Darwin does not support this well, so don't use pushes whenever it would be required. Differential Revision: http://reviews.llvm.org/D13767 llvm-svn: 251904
2015-11-03 16:17:25 +08:00
!1 = !DIFile(filename: "foo.c", directory: "foo")
!2 = !{}
!3 = !{!4}
DI: Reverse direction of subprogram -> function edge. Previously, subprograms contained a metadata reference to the function they described. Because most clients need to get or set a subprogram for a given function rather than the other way around, this created unneeded inefficiency. For example, many passes needed to call the function llvm::makeSubprogramMap() to build a mapping from functions to subprograms, and the IR linker needed to fix up function references in a way that caused quadratic complexity in the IR linking phase of LTO. This change reverses the direction of the edge by storing the subprogram as function-level metadata and removing DISubprogram's function field. Since this is an IR change, a bitcode upgrade has been provided. Fixes PR23367. An upgrade script for textual IR for out-of-tree clients is attached to the PR. Differential Revision: http://reviews.llvm.org/D14265 llvm-svn: 252219
2015-11-06 06:03:56 +08:00
!4 = distinct !DISubprogram(name: "test1", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, isOptimized: true, variables: !2)
[X86] Generate .cfi_adjust_cfa_offset correctly when pushing arguments When push instructions are being used to pass function arguments on the stack, and either EH or debugging are enabled, we need to generate .cfi_adjust_cfa_offset directives appropriately. For (synch) EH, it is enough for the CFA offset to be correct at every call site, while for debugging we want to be correct after every push. Darwin does not support this well, so don't use pushes whenever it would be required. Differential Revision: http://reviews.llvm.org/D13767 llvm-svn: 251904
2015-11-03 16:17:25 +08:00
!5 = !DISubroutineType(types: !6)
!6 = !{null}
!7 = !{i32 2, !"Dwarf Version", i32 4}
!8 = !{i32 2, !"Debug Info Version", i32 3}
!9 = !{!"clang version 3.8.0 (trunk 250289)"}
!10 = !DILocation(line: 4, column: 3, scope: !4)
!11 = !DILocation(line: 5, column: 3, scope: !4)
!12 = !DILocation(line: 6, column: 1, scope: !4)