71c7313f42
This commit adds a new option (i.e., `-fsanitize-cfi-icall-normalize-integers`) for normalizing integer types as vendor extended types for cross-language LLVM CFI/KCFI support with other languages that can't represent and encode C/C++ integer types. Specifically, integer types are encoded as their defined representations (e.g., 8-bit signed integer, 16-bit signed integer, 32-bit signed integer, ...) for compatibility with languages that define explicitly-sized integer types (e.g., i8, i16, i32, ..., in Rust). ``-fsanitize-cfi-icall-normalize-integers`` is compatible with ``-fsanitize-cfi-icall-generalize-pointers``. This helps with providing cross-language CFI support with the Rust compiler and is an alternative solution for the issue described and alternatives proposed in the RFC https://github.com/rust-lang/rfcs/pull/3296. For more information about LLVM CFI/KCFI and cross-language LLVM CFI/KCFI support for the Rust compiler, see the design document in the tracking issue https://github.com/rust-lang/rust/issues/89653. Relands b1e9ab7438a098a18fecda88fc87ef4ccadfcf1e with fixes. Reviewed By: pcc, samitolvanen Differential Revision: https://reviews.llvm.org/D139395
34 lines
1.4 KiB
C
34 lines
1.4 KiB
C
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -emit-llvm -fsanitize=kcfi -fsanitize-cfi-icall-experimental-normalize-integers -o - %s | FileCheck %s
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// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -emit-llvm -fsanitize=kcfi -fsanitize-cfi-icall-experimental-normalize-integers -x c++ -o - %s | FileCheck %s
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#if !__has_feature(kcfi)
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#error Missing kcfi?
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#endif
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// Test that normalized type metadata for functions are emitted for cross-language KCFI support with
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// other languages that can't represent and encode C/C++ integer types.
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void foo(void (*fn)(int), int arg) {
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// CHECK-LABEL: define{{.*}}foo
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// CHECK-SAME: {{.*}}!kcfi_type ![[TYPE1:[0-9]+]]
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// CHECK: call void %0(i32 noundef %1){{.*}}[ "kcfi"(i32 1162514891) ]
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fn(arg);
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}
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void bar(void (*fn)(int, int), int arg1, int arg2) {
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// CHECK-LABEL: define{{.*}}bar
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// CHECK-SAME: {{.*}}!kcfi_type ![[TYPE2:[0-9]+]]
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// CHECK: call void %0(i32 noundef %1, i32 noundef %2){{.*}}[ "kcfi"(i32 448046469) ]
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fn(arg1, arg2);
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}
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void baz(void (*fn)(int, int, int), int arg1, int arg2, int arg3) {
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// CHECK-LABEL: define{{.*}}baz
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// CHECK-SAME: {{.*}}!kcfi_type ![[TYPE3:[0-9]+]]
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// CHECK: call void %0(i32 noundef %1, i32 noundef %2, i32 noundef %3){{.*}}[ "kcfi"(i32 -2049681433) ]
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fn(arg1, arg2, arg3);
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}
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// CHECK: ![[TYPE1]] = !{i32 -1143117868}
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// CHECK: ![[TYPE2]] = !{i32 -460921415}
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// CHECK: ![[TYPE3]] = !{i32 -333839615}
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