310e3a8f60
On targets which use the MSVCRT, setjmp is a macro which expands to _setjmp or _setjmpex. _setjmp and _setjmpex have a secret, hidden argument which is not listed in the function prototype on X64 and WoA. This hidden argument always seems to be the frame pointer. _setjmpex isn't used on X86, _setjmp is magically replaced with a call to _setjmp3. The second argument is zero for 'normal' setjmp/longjmp pairs, otherwise it is a count of additional variadic arguments. This is used when setjmp appears inside of a try or __try. It is not safe to use a pointer to setjmp because _setjmp, _setjmpex and _setmp3 are not compatible with setjmp. llvm-svn: 227426
30 lines
1.1 KiB
C
30 lines
1.1 KiB
C
// RUN: %clang_cc1 -fms-extensions -triple i686-windows-msvc -emit-llvm %s -o - | FileCheck --check-prefix=I386 %s
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// RUN: %clang_cc1 -fms-extensions -triple x86_64-windows-msvc -emit-llvm %s -o - | FileCheck --check-prefix=X64 %s
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typedef char jmp_buf[1];
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int _setjmp(jmp_buf env);
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int _setjmpex(jmp_buf env);
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jmp_buf jb;
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int test_setjmp() {
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return _setjmp(jb);
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// I386-LABEL: define i32 @test_setjmp
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// I386: %[[call:.*]] = call i32 (i8*, i32, ...)* @_setjmp3(i8* getelementptr inbounds ([1 x i8]* @jb, i32 0, i32 0), i32 0)
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// I386-NEXT: ret i32 %[[call]]
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// X64-LABEL: define i32 @test_setjmp
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// X64: %[[addr:.*]] = call i8* @llvm.frameaddress(i32 0)
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// X64: %[[call:.*]] = call i32 @_setjmp(i8* getelementptr inbounds ([1 x i8]* @jb, i32 0, i32 0), i8* %[[addr]])
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// X64-NEXT: ret i32 %[[call]]
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}
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int test_setjmpex() {
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return _setjmpex(jb);
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// X64-LABEL: define i32 @test_setjmpex
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// X64: %[[addr:.*]] = call i8* @llvm.frameaddress(i32 0)
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// X64: %[[call:.*]] = call i32 @_setjmpex(i8* getelementptr inbounds ([1 x i8]* @jb, i32 0, i32 0), i8* %[[addr]])
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// X64-NEXT: ret i32 %[[call]]
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}
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