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llvm-project/clang/test/Driver/mfentry.c

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[Driver] Allow -mnop-mcount for SystemZ and -mfentry for X86 and SystemZ gcc/config/{i386,s390} support -mnop-mcount. We currently only support -mnop-mcount for SystemZ. The function attribute "mnop-mcount" is ignored on other targets. gcc/config/{i386,s390} support -mfentry. We currently only support -mfentry for X86 and SystemZ. TargetOpcode::FENTRY_CALL is not handled on other targets. % clang -target aarch64 -pg -mfentry a.c -c fatal error: error in backend: Not supported instr: <MCInst 21> -mfentry, -mrecord-mcount, and -mnop-mcount were invented for Linux ftrace. Linux uses $(call cc-option-yn,-mrecord-mcount) to detect if the specific feature is available. Reject unsupported features so that Linux build system will not wrongly consider them available and cause build/runtime failures. Note, GCC has stricter checks that we do not implement, e.g. -fpic/-fpie -fnop-mcount is not allowed on x86, -fpic/-fpie -mfentry is not allowed on x86-32.
2019-12-22 15:18:24 +08:00
// RUN: %clang -target s390x -c -### %s -mfentry 2>&1 | FileCheck %s
// RUN: %clang -target i386 -c -### %s -mfentry 2>&1 | FileCheck %s
// RUN: %clang -target x86_64 -c -### %s -mfentry 2>&1 | FileCheck %s
[Driver] -pg -mfentry should respect target specific decisions for -mframe-pointer=all Summary: $ clang -O2 -pg -mfentry foo.c was adding frame pointers to all functions. This was exposed via compiling the Linux kernel for x86_64 with CONFIG_FUNCTION_TRACER enabled. -pg was unconditionally setting the equivalent of -fno-omit-frame-pointer, regardless of the presence of -mfentry or optimization level. After this patch, frame pointers will only be omitted at -O0 or if -fno-omit-frame-pointer is explicitly set for -pg -mfentry. See also: https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=3c5273a96ba8dbf98c40bc6d9d0a1587b4cfedb2;hp=c9d75a48c4ea63ab27ccdb40f993236289b243f2#patch2 (modification to ix86_frame_pointer_required()) Fixes: pr/44934 Reviewers: void, manojgupta, dberris, MaskRay, hfinkel Reviewed By: MaskRay Subscribers: cfe-commits, llozano, niravd, srhines Tags: #clang Differential Revision: https://reviews.llvm.org/D74698
2020-02-19 07:33:42 +08:00
// RUN: %clang -target x86_64-linux-gnu -pg -mfentry -O0 -### -E %s 2>&1 | FileCheck -check-prefix=FP %s
// RUN: %clang -target x86_64-linux-gnu -pg -mfentry -O2 -fno-omit-frame-pointer -### -E %s 2>&1 | FileCheck -check-prefix=FP %s
// RUN: %clang -target x86_64-linux-gnu -pg -mfentry -O2 -### -E %s 2>&1 | FileCheck -check-prefix=NOFP %s
// RUN: %clang -target x86_64 -pg -mfentry -O0 -### -E %s 2>&1 | FileCheck -check-prefix=FP %s
// RUN: %clang -target x86_64 -pg -mfentry -O2 -fno-omit-frame-pointer -### -E %s 2>&1 | FileCheck -check-prefix=FP %s
// RUN: %clang -target x86_64 -pg -mfentry -O2 -### -E %s 2>&1 | FileCheck -check-prefix=FP %s
[Driver] Allow -mnop-mcount for SystemZ and -mfentry for X86 and SystemZ gcc/config/{i386,s390} support -mnop-mcount. We currently only support -mnop-mcount for SystemZ. The function attribute "mnop-mcount" is ignored on other targets. gcc/config/{i386,s390} support -mfentry. We currently only support -mfentry for X86 and SystemZ. TargetOpcode::FENTRY_CALL is not handled on other targets. % clang -target aarch64 -pg -mfentry a.c -c fatal error: error in backend: Not supported instr: <MCInst 21> -mfentry, -mrecord-mcount, and -mnop-mcount were invented for Linux ftrace. Linux uses $(call cc-option-yn,-mrecord-mcount) to detect if the specific feature is available. Reject unsupported features so that Linux build system will not wrongly consider them available and cause build/runtime failures. Note, GCC has stricter checks that we do not implement, e.g. -fpic/-fpie -fnop-mcount is not allowed on x86, -fpic/-fpie -mfentry is not allowed on x86-32.
2019-12-22 15:18:24 +08:00
// CHECK: "-mfentry"
// RUN: %clang -target powerpc64le -c -### %s -mfentry 2>&1 | FileCheck --check-prefix=ERR %s
// ERR: error: unsupported option '-mfentry' for target 'powerpc64le'
[Driver] -pg -mfentry should respect target specific decisions for -mframe-pointer=all Summary: $ clang -O2 -pg -mfentry foo.c was adding frame pointers to all functions. This was exposed via compiling the Linux kernel for x86_64 with CONFIG_FUNCTION_TRACER enabled. -pg was unconditionally setting the equivalent of -fno-omit-frame-pointer, regardless of the presence of -mfentry or optimization level. After this patch, frame pointers will only be omitted at -O0 or if -fno-omit-frame-pointer is explicitly set for -pg -mfentry. See also: https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=3c5273a96ba8dbf98c40bc6d9d0a1587b4cfedb2;hp=c9d75a48c4ea63ab27ccdb40f993236289b243f2#patch2 (modification to ix86_frame_pointer_required()) Fixes: pr/44934 Reviewers: void, manojgupta, dberris, MaskRay, hfinkel Reviewed By: MaskRay Subscribers: cfe-commits, llozano, niravd, srhines Tags: #clang Differential Revision: https://reviews.llvm.org/D74698
2020-02-19 07:33:42 +08:00
// FP: "-mframe-pointer=all"
// NOFP: "-mframe-pointer=none"
void foo(void) {}