bf6e7848a0
On Darwin, simple C null-terminated constant strings normally end up in the __TEXT,__cstring section of the resulting Mach-O binary. When instrumented with ASan, these strings are transformed in a way that they cannot be in __cstring (the linker unifies the content of this section and strips extra NUL bytes, which would break instrumentation), and are put into a generic __const section. This breaks some of the tools that we have: Some tools need to scan all C null-terminated strings in Mach-O binaries, and scanning all the contents of __const has a large performance penalty. This patch instead introduces a special section, __asan_cstring which will now hold the instrumented null-terminated strings. Differential Revision: https://reviews.llvm.org/D25026 llvm-svn: 285620
18 lines
529 B
C
18 lines
529 B
C
// Test that AddressSanitizer moves constant strings into a separate section.
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// RUN: %clang_asan -c -o %t %s
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// RUN: llvm-objdump -s %t | FileCheck %s
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// Check that "Hello.\n" is in __asan_cstring and not in __cstring.
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// CHECK: Contents of section __asan_cstring:
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// CHECK: 48656c6c {{.*}} Hello.
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// CHECK: Contents of section __const:
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// CHECK-NOT: 48656c6c {{.*}} Hello.
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// CHECK: Contents of section __cstring:
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// CHECK-NOT: 48656c6c {{.*}} Hello.
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int main(int argc, char *argv[]) {
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argv[0] = "Hello.\n";
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return 0;
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}
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