9565cf581e
It currently only takes 2048 gotos to overflow the FixupDepth bitfield, causing silent miscompilation. Apparently some parser generators run into this (see PR). I don't know that that data structure is terribly size sensitive anyway, and since there's no room to widen the bitfield, let's just use a separate word in EHCatchScope for it. Differential Revision: http://reviews.llvm.org/D21566 llvm-svn: 273434
27 lines
662 B
C
27 lines
662 B
C
// RUN: %clang_cc1 -O1 -disable-llvm-optzns -emit-llvm -o - %s | FileCheck %s
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#define M if (x) goto L1;
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#define M10 M M M M M M M M M M
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#define M100 M10 M10 M10 M10 M10 M10 M10 M10 M10 M10
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#define M1000 M100 M100 M100 M100 M100 M100 M100 M100 M100 M100
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void f(int x) {
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int h;
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// Many gotos to not-yet-emitted labels would cause EHScope's FixupDepth
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// to overflow (PR23490).
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M1000 M1000 M1000
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if (x == 5) {
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// This will cause us to emit a clean-up of the stack variable. If the
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// FixupDepths are broken, fixups will erroneously get threaded through it.
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int i;
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}
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L1:
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return;
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}
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// CHECK-LABEL: define void @f
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// CHECK-NOT: cleanup
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