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82cb0e3bb0
Summary: Relate bug: https://bugs.llvm.org/show_bug.cgi?id=37472 The shrink wrapping pass prematurally restores the stack, at a point where the stack might still be accessed. Taking an exception can cause the stack to be corrupted. As a first approach, this patch is overly conservative, assuming that any instruction that may load or store could access the stack. Reviewers: dmgreen, qcolombet Reviewed By: qcolombet Subscribers: simpal01, efriedma, eli.friedman, javed.absar, llvm-commits, eugenis, chill, carwil, thegameg Tags: #llvm Differential Revision: https://reviews.llvm.org/D63152 llvm-svn: 363265
47 lines
2.1 KiB
LLVM
47 lines
2.1 KiB
LLVM
; RUN: llc -relocation-model=static -verify-machineinstrs < %s -mtriple=powerpc64-unknown-linux-gnu -disable-ppc-sco=false --enable-shrink-wrap=false | FileCheck %s -check-prefix=CHECK-SCO-ONLY
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; RUN: llc -relocation-model=static -verify-machineinstrs < %s -mtriple=powerpc64-unknown-linux-gnu -disable-ppc-sco=false --enable-shrink-wrap=true | FileCheck %s -check-prefix=CHECK-SCO-ONLY
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; RUN: llc -relocation-model=static -verify-machineinstrs < %s -mtriple=powerpc64le-unknown-linux-gnu -disable-ppc-sco=false --enable-shrink-wrap=false | FileCheck %s -check-prefix=CHECK-SCO-ONLY
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; RUN: llc -relocation-model=static -verify-machineinstrs < %s -mtriple=powerpc64le-unknown-linux-gnu -disable-ppc-sco=false --enable-shrink-wrap=true | FileCheck %s -check-prefix=CHECK-SCO-ONLY
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; Edit: D63152 prevents stack popping before loads and stores, so shrink-wrap does nothing here
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%"class.clang::NamedDecl" = type { i32 }
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declare void @__assert_fail();
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define i8 @_ZNK5clang9NamedDecl23getLinkageAndVisibilityEv(
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%"class.clang::NamedDecl"* %this) {
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entry:
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%tobool = icmp eq %"class.clang::NamedDecl"* %this, null
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br i1 %tobool, label %cond.false, label %exit
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cond.false:
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tail call void @__assert_fail()
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unreachable
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exit:
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%DeclKind = getelementptr inbounds
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%"class.clang::NamedDecl",
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%"class.clang::NamedDecl"* %this, i64 0, i32 0
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%bf.load = load i32, i32* %DeclKind, align 4
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%call.i = tail call i8 @LVComputationKind(
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%"class.clang::NamedDecl"* %this,
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i32 %bf.load)
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ret i8 %call.i
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; CHECK-SCO-SHRK-LABEL: _ZNK5clang9NamedDecl23getLinkageAndVisibilityEv:
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; CHECK-SCO-SHRK: b LVComputationKind
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; CHECK-SCO-SHRK: #TC_RETURNd8
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; CHECK-SCO-SHRK: stdu 1, -{{[0-9]+}}(1)
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; CHECK-SCO-SHRK: bl __assert_fail
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;
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; CHECK-SCO-ONLY-LABEL: _ZNK5clang9NamedDecl23getLinkageAndVisibilityEv:
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; CHECK-SCO-ONLY: stdu 1, -{{[0-9]+}}(1)
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; CHECK-SCO-ONLY: b LVComputationKind
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; CHECK-SCO-ONLY: #TC_RETURNd8
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; CHECK-SCO-ONLY: bl __assert_fail
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}
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define fastcc i8 @LVComputationKind(
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%"class.clang::NamedDecl"* %D,
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i32 %computation) {
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ret i8 0
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}
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