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cc12b285b6
This will currently accept the old number of bytes syntax, and convert it to a scalar. This should be removed in the near future (I think I converted all of the tests already, but likely missed a few). Not sure what the exact syntax and policy should be. We can continue printing the number of bytes for non-generic instructions to avoid test churn and only allow non-scalar types for generic instructions. This will currently print the LLT in parentheses, but accept parsing the existing integers and implicitly converting to scalar. The parentheses are a bit ugly, but the parser logic seems unable to deal without either parentheses or some keyword to indicate the start of a type.
120 lines
5.6 KiB
YAML
120 lines
5.6 KiB
YAML
# RUN: llc -o - %s -start-after=patchable-function -O0 -mtriple=x86_64-unknown-linux-gnu | FileCheck %s
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# Test dwarf codegen of DW_OP_minus.
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#
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# This was built by compiling the following source with SafeStack and
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# simplifying the result a little.
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# extern "C" {
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# void Capture(int *);
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# void f() {
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# int buf[100];
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# Capture(buf);
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# }
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# }
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# The interesting part is !DIExpression(DW_OP_constu, 400, DW_OP_minus)
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#
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# RCX - 400
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# CHECK: .short 3 # Loc expr size
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# CHECK-NEXT: .byte 114 # DW_OP_breg2
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# CHECK-NEXT: .byte 240 # -400
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# CHECK-NEXT: .byte 124
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#
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# RCX is clobbered in call @Capture, but there is a spilled copy.
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# *(RSP + 8) - 400
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# CHECK: .short 7 # Loc expr size
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# CHECK-NEXT: .byte 119 # DW_OP_breg7
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# CHECK-NEXT: .byte 8 # 8
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# CHECK-NEXT: .byte 6 # DW_OP_deref
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# CHECK-NEXT: .byte 16 # DW_OP_constu
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# CHECK-NEXT: .byte 144 # 400
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# CHECK-NEXT: .byte 3 #
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# CHECK-NEXT: .byte 28 # DW_OP_minus
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--- |
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@__safestack_unsafe_stack_ptr = external thread_local(initialexec) global i8*
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define void @f() !dbg !5 {
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entry:
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%unsafe_stack_ptr = load i8*, i8** @__safestack_unsafe_stack_ptr
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%unsafe_stack_static_top = getelementptr i8, i8* %unsafe_stack_ptr, i32 -400
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store i8* %unsafe_stack_static_top, i8** @__safestack_unsafe_stack_ptr
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%0 = getelementptr i8, i8* %unsafe_stack_ptr, i32 -400
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%buf = bitcast i8* %0 to [100 x i32]*
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%1 = bitcast [100 x i32]* %buf to i8*, !dbg !14
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call void @llvm.dbg.declare(metadata i8* %unsafe_stack_ptr, metadata !9, metadata !DIExpression(DW_OP_constu, 400, DW_OP_minus)), !dbg !15
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%arraydecay = getelementptr inbounds [100 x i32], [100 x i32]* %buf, i64 0, i64 0, !dbg !16
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call void @Capture(i32* %arraydecay), !dbg !17
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store i8* %unsafe_stack_ptr, i8** @__safestack_unsafe_stack_ptr, !dbg !18
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ret void, !dbg !18
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}
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #0
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declare void @Capture(i32*)
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; Function Attrs: nounwind
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declare void @llvm.stackprotector(i8*, i8**) #1
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attributes #0 = { nounwind readnone speculatable }
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attributes #1 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (trunk 248518) (llvm/trunk 248512)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "1.cc", directory: "/tmp")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 4, type: !6, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !8)
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!6 = !DISubroutineType(types: !7)
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!7 = !{null}
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!8 = !{!9}
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!9 = !DILocalVariable(name: "buf", scope: !5, file: !1, line: 5, type: !10)
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!10 = !DICompositeType(tag: DW_TAG_array_type, baseType: !11, size: 3200, align: 32, elements: !12)
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!11 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!12 = !{!13}
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!13 = !DISubrange(count: 100)
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!14 = !DILocation(line: 5, column: 3, scope: !5)
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!15 = !DILocation(line: 5, column: 7, scope: !5)
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!16 = !DILocation(line: 6, column: 11, scope: !5)
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!17 = !DILocation(line: 6, column: 3, scope: !5)
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!18 = !DILocation(line: 7, column: 1, scope: !5)
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...
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---
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name: f
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alignment: 16
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tracksRegLiveness: true
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frameInfo:
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stackSize: 24
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maxAlignment: 8
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adjustsStack: true
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hasCalls: true
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maxCallFrameSize: 0
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stack:
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- { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 8, stack-id: default }
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- { id: 1, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: default }
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body: |
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bb.0.entry:
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$rsp = frame-setup SUB64ri8 $rsp, 24, implicit-def dead $eflags
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CFI_INSTRUCTION def_cfa_offset 32
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renamable $rax = MOV64rm $rip, 1, $noreg, target-flags(x86-gottpoff) @__safestack_unsafe_stack_ptr, $noreg :: (load (s64) from got)
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renamable $rcx = MOV64rm renamable $rax, 1, $noreg, 0, $fs :: (dereferenceable load (s64) from @__safestack_unsafe_stack_ptr)
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DBG_VALUE renamable $rcx, 0, !9, !DIExpression(DW_OP_constu, 400, DW_OP_minus), debug-location !15
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$rdx = MOV64rr $rcx
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renamable $rdx = ADD64ri32 renamable $rdx, -400, implicit-def dead $eflags
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MOV64mr renamable $rax, 1, $noreg, 0, $fs, renamable $rdx :: (store (s64) into @__safestack_unsafe_stack_ptr)
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$rdi = MOV64rr killed $rdx, debug-location !17
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MOV64mr $rsp, 1, $noreg, 16, $noreg, killed $rax :: (store (s64) into %stack.0)
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MOV64mr $rsp, 1, $noreg, 8, $noreg, killed $rcx :: (store (s64) into %stack.1)
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DBG_VALUE $rsp, 0, !9, !DIExpression(DW_OP_plus_uconst, 8, DW_OP_deref, DW_OP_constu, 400, DW_OP_minus), debug-location !15
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CALL64pcrel32 @Capture, csr_64, implicit $rsp, implicit $ssp, implicit killed $rdi, implicit-def $rsp, implicit-def $ssp, debug-location !17
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$rax = MOV64rm $rsp, 1, $noreg, 16, $noreg :: (load (s64) from %stack.0)
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$rcx = MOV64rm $rsp, 1, $noreg, 8, $noreg :: (load (s64) from %stack.1)
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MOV64mr killed renamable $rax, 1, $noreg, 0, $fs, killed renamable $rcx, debug-location !18 :: (store (s64) into @__safestack_unsafe_stack_ptr)
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$rsp = frame-destroy ADD64ri8 $rsp, 24, implicit-def dead $eflags, debug-location !18
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CFI_INSTRUCTION def_cfa_offset 8, debug-location !18
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RETQ debug-location !18
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...
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