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[clang][ARM] disable frame pointers by default for bare metal ARM targets #117140

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Merged
stuij merged 7 commits into from
Dec 6, 2024
Merged

[clang][ARM] disable frame pointers by default for bare metal ARM targets #117140

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4a85a0c
[clang][ARM] disable frame pointers by default for bare metal ARM tar…
stuij Nov 15, 2024
51a5d72
fix clang -> toolchains closing brace comment mislabel
stuij Nov 21, 2024
9aeb61f
Remove braces around single statement `if` body
stuij Nov 21, 2024
d953a8d
Add Apple embedded tests
stuij Nov 26, 2024
b972b8b
satisfy clang-format
stuij Nov 26, 2024
26c854f
Rename isARMBareMetal -> isArmEABIBareMetal
stuij Nov 29, 2024
cc3b138
Move isARMEABIBareMetal to clang/lib/Driver/ToolChains/Arch/ARM.cpp
stuij Dec 3, 2024
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8 changes: 7 additions & 1 deletion clang/lib/Driver/ToolChains/BareMetal.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -128,8 +128,11 @@ BareMetal::BareMetal(const Driver &D, const llvm::Triple &Triple,
}
}

namespace clang {
namespace driver {
namespace toolchains {
/// Is the triple {arm,armeb,thumb,thumbeb}-none-none-{eabi,eabihf} ?
static bool isARMBareMetal(const llvm::Triple &Triple) {
bool isARMBareMetal(const llvm::Triple &Triple) {
if (Triple.getArch() != llvm::Triple::arm &&
Triple.getArch() != llvm::Triple::thumb &&
Triple.getArch() != llvm::Triple::armeb &&
Expand All @@ -148,6 +151,9 @@ static bool isARMBareMetal(const llvm::Triple &Triple) {

return true;
}
} // namespace toolchains
} // namespace driver
} // namespace clang

/// Is the triple {aarch64.aarch64_be}-none-elf?
static bool isAArch64BareMetal(const llvm::Triple &Triple) {
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2 changes: 2 additions & 0 deletions clang/lib/Driver/ToolChains/BareMetal.h
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Expand Up @@ -19,6 +19,8 @@ namespace driver {

namespace toolchains {

bool isARMBareMetal(const llvm::Triple &Triple);

class LLVM_LIBRARY_VISIBILITY BareMetal : public ToolChain {
public:
BareMetal(const Driver &D, const llvm::Triple &Triple,
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5 changes: 5 additions & 0 deletions clang/lib/Driver/ToolChains/CommonArgs.cpp
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Expand Up @@ -19,6 +19,7 @@
#include "Arch/SystemZ.h"
#include "Arch/VE.h"
#include "Arch/X86.h"
#include "BareMetal.h"
#include "HIPAMD.h"
#include "Hexagon.h"
#include "MSP430.h"
Expand Down Expand Up @@ -151,6 +152,10 @@ static bool useFramePointerForTargetByDefault(const llvm::opt::ArgList &Args,
}
}

if (toolchains::isARMBareMetal(Triple)) {
return false;
}

return true;
}

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29 changes: 29 additions & 0 deletions clang/test/Driver/frame-pointer-elim.c
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Expand Up @@ -162,5 +162,34 @@
// RUN: FileCheck --check-prefix=KEEP-NON-LEAF %s
// RUN: not %clang -### --target=riscv64-linux-android -mbig-endian -O1 -S %s 2>&1 | \
// RUN: FileCheck --check-prefix=KEEP-NON-LEAF %s

// On ARM backend bare metal targets, frame pointer is omitted
// RUN: %clang -### --target=arm-arm-none-eabi -S %s 2>&1 | \
// RUN: FileCheck --check-prefix=KEEP-NONE %s
// RUN: %clang -### --target=arm-arm-none-eabihf -S %s 2>&1 | \
// RUN: FileCheck --check-prefix=KEEP-NONE %s
// RUN: %clang -### --target=arm-arm-none-eabi -S -fno-omit-frame-pointer %s 2>&1 | \
// RUN: FileCheck --check-prefix=KEEP-ALL %s
// RUN: %clang -### --target=arm-arm-none-eabihf -S -fno-omit-frame-pointer %s 2>&1 | \
// RUN: FileCheck --check-prefix=KEEP-ALL %s
// RUN: %clang -### --target=arm-arm-none-eabi -S -O1 %s 2>&1 | \
// RUN: FileCheck --check-prefix=KEEP-NONE %s
// RUN: %clang -### --target=arm-arm-none-eabihf -S -O1 %s 2>&1 | \
// RUN: FileCheck --check-prefix=KEEP-NONE %s
// RUN: %clang -### --target=arm-arm-none-eabi -S -O1 -fno-omit-frame-pointer %s 2>&1 | \
// RUN: FileCheck --check-prefix=KEEP-ALL %s
// RUN: %clang -### --target=arm-arm-none-eabihf -S -O1 -fno-omit-frame-pointer %s 2>&1 | \
// RUN: FileCheck --check-prefix=KEEP-ALL %s

// AArch64 bare metal targets behave like hosted targets
// RUN: %clang -### --target=aarch64-none-elf -S %s 2>&1 | \
// RUN: FileCheck --check-prefix=KEEP-NON-LEAF %s
// RUN: %clang -### --target=aarch64-none-elf -S -O1 %s 2>&1 | \
// RUN: FileCheck --check-prefix=KEEP-NON-LEAF %s
// RUN: %clang -### --target=aarch64-none-elf -S -fno-omit-frame-pointer %s 2>&1 | \
// RUN: FileCheck --check-prefix=KEEP-NON-LEAF %s
// RUN: %clang -### --target=aarch64-none-elf -S -O1 -fno-omit-frame-pointer %s 2>&1 | \
// RUN: FileCheck --check-prefix=KEEP-NON-LEAF %s

void f0() {}
void f1() { f0(); }
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