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634c601fe3
Summary: This change allows generalizing pointers in type signatures used for cfi-icall by enabling the -fsanitize-cfi-icall-generalize-pointers flag. This works by 1) emitting an additional generalized type signature metadata node for functions and 2) llvm.type.test()ing for the generalized type for translation units with the flag specified. This flag is incompatible with -fsanitize-cfi-cross-dso because it would require emitting twice as many type hashes which would increase artifact size. Reviewers: pcc, eugenis Reviewed By: pcc Subscribers: kcc Differential Revision: https://reviews.llvm.org/D39358 llvm-svn: 317044
20 lines
1.0 KiB
C
20 lines
1.0 KiB
C
// RUN: %clang_cc1 -triple x86_64-unknown-linux -fsanitize=cfi-icall -fsanitize-trap=cfi-icall -emit-llvm -o - %s | FileCheck --check-prefix=CHECK --check-prefix=UNGENERALIZED %s
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// RUN: %clang_cc1 -triple x86_64-unknown-linux -fsanitize=cfi-icall -fsanitize-trap=cfi-icall -fsanitize-cfi-icall-generalize-pointers -emit-llvm -o - %s | FileCheck --check-prefix=CHECK --check-prefix=GENERALIZED %s
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// Test that const char* is generalized to const void* and that const char** is
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// generalized to void*
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// CHECK: define i32** @f({{.*}} !type [[TYPE:![0-9]+]] !type [[TYPE_GENERALIZED:![0-9]+]]
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int** f(const char *a, const char **b) {
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return (int**)0;
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}
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void g(int** (*fp)(const char *, const char **)) {
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// UNGENERALIZED: call i1 @llvm.type.test(i8* {{.*}}, metadata !"_ZTSFPPiPKcPS2_E")
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// GENERALIZED: call i1 @llvm.type.test(i8* {{.*}}, metadata !"_ZTSFPvPKvS_E.generalized")
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fp(0, 0);
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}
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// CHECK: [[TYPE]] = !{i64 0, !"_ZTSFPPiPKcPS2_E"}
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// CHECK: [[TYPE_GENERALIZED]] = !{i64 0, !"_ZTSFPvPKvS_E.generalized"}
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