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https://github.com/RPCS3/llvm-mirror.git
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3a75cd4bf9
With this change, ideally IR pass can always generate llvm.stackguard call to get the stack guard; but for now there are still IR form stack guard customizations around (see getIRStackGuard()). Future SSP customization should go through LOAD_STACK_GUARD. There is a behavior change: stack guard values are not CSEed anymore, since we should never reuse the value in case that it has been spilled (and corrupted). See ssp-guard-spill.ll. This also cause the change of stack size and codegen in X86 and AArch64 test cases. Ideally we'd like to know if the guard created in llvm.stackprotector() gets spilled or not. If the value is spilled, discard the value and reload stack guard; otherwise reuse the value. This can be done by teaching register allocator to know how to rematerialize LOAD_STACK_GUARD and force a rematerialization (which seems hard), or check for spilling in expandPostRAPseudo. It only makes sense when the stack guard is a global variable, which requires more instructions to load. Anyway, this seems to go out of the scope of the current patch. llvm-svn: 266806
107 lines
4.7 KiB
LLVM
107 lines
4.7 KiB
LLVM
; RUN: llc -O0 -mtriple=x86_64-apple-darwin -filetype=asm %s -o - | FileCheck %s
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; Ensure that we generate an indirect location for the variable length array a.
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; CHECK: ##DEBUG_VALUE: vla:a <- [%RCX+0]
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; CHECK: DW_OP_breg2
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; rdar://problem/13658587
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;
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; generated from:
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;
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; int vla(int n) {
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; int a[n];
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; a[0] = 42;
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; return a[n-1];
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; }
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;
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; int main(int argc, char** argv) {
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; return vla(argc);
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; }
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; ModuleID = 'vla.c'
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.8.0"
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; Function Attrs: nounwind ssp uwtable
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define i32 @vla(i32 %n) nounwind ssp uwtable !dbg !4 {
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entry:
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%n.addr = alloca i32, align 4
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%saved_stack = alloca i8*
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%cleanup.dest.slot = alloca i32
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store i32 %n, i32* %n.addr, align 4
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call void @llvm.dbg.declare(metadata i32* %n.addr, metadata !15, metadata !DIExpression()), !dbg !16
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%0 = load i32, i32* %n.addr, align 4, !dbg !17
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%1 = zext i32 %0 to i64, !dbg !17
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%2 = call i8* @llvm.stacksave(), !dbg !17
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store i8* %2, i8** %saved_stack, !dbg !17
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%vla = alloca i32, i64 %1, align 16, !dbg !17
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call void @llvm.dbg.declare(metadata i32* %vla, metadata !18, metadata !DIExpression(DW_OP_deref)), !dbg !17
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%arrayidx = getelementptr inbounds i32, i32* %vla, i64 0, !dbg !22
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store i32 42, i32* %arrayidx, align 4, !dbg !22
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%3 = load i32, i32* %n.addr, align 4, !dbg !23
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%sub = sub nsw i32 %3, 1, !dbg !23
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%idxprom = sext i32 %sub to i64, !dbg !23
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%arrayidx1 = getelementptr inbounds i32, i32* %vla, i64 %idxprom, !dbg !23
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%4 = load i32, i32* %arrayidx1, align 4, !dbg !23
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store i32 1, i32* %cleanup.dest.slot
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%5 = load i8*, i8** %saved_stack, !dbg !24
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call void @llvm.stackrestore(i8* %5), !dbg !24
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ret i32 %4, !dbg !23
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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; Function Attrs: nounwind
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declare i8* @llvm.stacksave() nounwind
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; Function Attrs: nounwind
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declare void @llvm.stackrestore(i8*) nounwind
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; Function Attrs: nounwind ssp uwtable
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define i32 @main(i32 %argc, i8** %argv) nounwind ssp uwtable !dbg !9 {
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entry:
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%retval = alloca i32, align 4
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%argc.addr = alloca i32, align 4
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%argv.addr = alloca i8**, align 8
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store i32 0, i32* %retval
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store i32 %argc, i32* %argc.addr, align 4
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call void @llvm.dbg.declare(metadata i32* %argc.addr, metadata !25, metadata !DIExpression()), !dbg !26
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store i8** %argv, i8*** %argv.addr, align 8
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call void @llvm.dbg.declare(metadata i8*** %argv.addr, metadata !27, metadata !DIExpression()), !dbg !26
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%0 = load i32, i32* %argc.addr, align 4, !dbg !28
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%call = call i32 @vla(i32 %0), !dbg !28
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ret i32 %call, !dbg !28
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!29}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.3 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "vla.c", directory: "")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "vla", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DIFile(filename: "vla.c", directory: "")
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!6 = !DISubroutineType(types: !7)
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!7 = !{!8, !8}
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!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = distinct !DISubprogram(name: "main", line: 7, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 7, file: !1, scope: !5, type: !10, variables: !2)
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!10 = !DISubroutineType(types: !11)
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!11 = !{!8, !8, !12}
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!12 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !13)
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!13 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !14)
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!14 = !DIBasicType(tag: DW_TAG_base_type, name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
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!15 = !DILocalVariable(name: "n", line: 1, arg: 1, scope: !4, file: !5, type: !8)
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!16 = !DILocation(line: 1, scope: !4)
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!17 = !DILocation(line: 2, scope: !4)
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!18 = !DILocalVariable(name: "a", line: 2, scope: !4, file: !5, type: !19)
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!19 = !DICompositeType(tag: DW_TAG_array_type, align: 32, baseType: !8, elements: !20)
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!20 = !{!21}
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!21 = !DISubrange(count: -1)
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!22 = !DILocation(line: 3, scope: !4)
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!23 = !DILocation(line: 4, scope: !4)
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!24 = !DILocation(line: 5, scope: !4)
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!25 = !DILocalVariable(name: "argc", line: 7, arg: 1, scope: !9, file: !5, type: !8)
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!26 = !DILocation(line: 7, scope: !9)
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!27 = !DILocalVariable(name: "argv", line: 7, arg: 2, scope: !9, file: !5, type: !12)
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!28 = !DILocation(line: 8, scope: !9)
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!29 = !{i32 1, !"Debug Info Version", i32 3}
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