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[BOLT][AArch64] Provide createDummyReturnFunction #96626

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Merged
merged 8 commits into from
Jul 15, 2024
Merged

[BOLT][AArch64] Provide createDummyReturnFunction #96626

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a2e6301
[BOLT][AArch64] Instrumentation for static binaries doesn't work in r…
paschalis-mpeis Jun 25, 2024
8e7dad8
[BOLT][AArch64] Implemented createDummyReturnFunction.
paschalis-mpeis Jun 25, 2024
0c3bc04
Refactored, improved test, and addressed reviewers.
paschalis-mpeis Jul 5, 2024
542e46e
Addressing reviewers (1): Uplifted 'createDummyReturn' to base class
paschalis-mpeis Jul 10, 2024
1a0542a
Addressing reviewers (2)
paschalis-mpeis Jul 11, 2024
8351110
Update bolt/test/AArch64/dummy-return.test
paschalis-mpeis Jul 12, 2024
fa4ded3
Converted test to assembly for '%cflags' compatibility.
paschalis-mpeis Jul 12, 2024
822621c
Ignore test on X86
paschalis-mpeis Jul 12, 2024
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8 changes: 6 additions & 2 deletions bolt/include/bolt/Core/MCPlusBuilder.h
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Original file line number Diff line number Diff line change
Expand Up @@ -2041,9 +2041,13 @@ class MCPlusBuilder {
return InstructionListType();
}

/// Returns a function body that contains only a return instruction. An
/// example usage is a workaround for the '__bolt_fini_trampoline' of
// Instrumentation.
virtual InstructionListType createDummyReturnFunction(MCContext *Ctx) const {
llvm_unreachable("not implemented");
return InstructionListType();
InstructionListType Insts(1);
createReturn(Insts[0]);
return Insts;
}

/// This method takes an indirect call instruction and splits it up into an
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6 changes: 0 additions & 6 deletions bolt/lib/Target/X86/X86MCPlusBuilder.cpp
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Expand Up @@ -3241,12 +3241,6 @@ class X86MCPlusBuilder : public MCPlusBuilder {
return Insts;
}

InstructionListType createDummyReturnFunction(MCContext *Ctx) const override {
InstructionListType Insts(1);
createReturn(Insts[0]);
return Insts;
}

BlocksVectorTy indirectCallPromotion(
const MCInst &CallInst,
const std::vector<std::pair<MCSymbol *, uint64_t>> &Targets,
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28 changes: 28 additions & 0 deletions bolt/test/AArch64/dummy-return.s
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@@ -0,0 +1,28 @@
# REQUIRES: system-linux,target=aarch64{{.*}}

# RUN: llvm-mc -filetype=obj -triple aarch64-unknown-unknown %s -o %t.o
# RUN: %clang %cflags %t.o -o %t.exe -Wl,-q -static
# RUN: llvm-bolt -instrument -instrumentation-sleep-time=1 %t.exe \
# RUN: -o %t.instr 2>&1 | FileCheck %s
# RUN: llvm-objdump --disassemble-symbols=__bolt_fini_trampoline %t.instr -D \
# RUN: | FileCheck %s -check-prefix=CHECK-ASM

# CHECK: BOLT-INFO: output linked against instrumentation runtime library
# CHECK-ASM: <__bolt_fini_trampoline>:
# CHECK-ASM-NEXT: ret

.text
.align 4
.global _start
.type _start, %function
_start:
bl foo
ret
.size _start, .-_start

.global foo
.type foo, %function
foo:
mov w0, wzr
ret
.size foo, .-foo
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