1351d17826
(The profile format change is split into a standalone change into https://github.com/llvm/llvm-project/pull/81691) * For InstrFDO value profiling, implement instrumentation and lowering for virtual table address. * This is controlled by `-enable-vtable-value-profiling` and off by default. * When the option is on, raw profiles will carry serialized `VTableProfData` structs and compressed vtables as payloads. * Implement profile reader and writer support * Raw profile reader is used by `llvm-profdata` but not compiler. Raw profile reader will construct InstrProfSymtab with symbol names, and map profiled runtime address to vtable symbols. * Indexed profile reader is used by `llvm-profdata` and compiler. When initialized, the reader stores a pointer to the beginning of in-memory compressed vtable names and the length of string. When used in `llvm-profdata`, reader decompress the string to show symbols of a profiled site. When used in compiler, string decompression doesn't happen since IR is used to construct InstrProfSymtab. * Indexed profile writer collects the list of vtable names, and stores that to index profiles. * Text profile reader and writer support are added but mostly follow the implementation for indirect-call value type. * `llvm-profdata show -show-vtables <args> <profile>` is implemented. rfc in https://discourse.llvm.org/t/rfc-dynamic-type-profiling-and-optimizations-in-llvm/74600#pick-instrumentation-points-and-instrument-runtime-types-7
35 lines
1.3 KiB
LLVM
35 lines
1.3 KiB
LLVM
; RUN: opt < %s -passes=pgo-instr-gen -enable-vtable-value-profiling -S 2>&1 | FileCheck %s
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; Test that unsupported warning is emitted for non-ELF object files.
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target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
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target triple = "arm64-apple-macosx14.0.0"
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; CHECK: warning: {{.*}} VTable value profiling is presently not supported for non-ELF object formats
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@_ZTV4Base = constant { [3 x ptr] } { [3 x ptr] [ptr null, ptr null, ptr @_ZN4Base4funcEi] }, !type !0, !type !1
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@_ZTV7Derived = constant { [3 x ptr] } { [3 x ptr] [ptr null, ptr null, ptr @_ZN7Derived4funcEi] }, !type !0, !type !1, !type !2, !type !3
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@llvm.compiler.used = appending global [2 x ptr] [ptr @_ZTV4Base, ptr @_ZTV7Derived], section "llvm.metadata"
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define i32 @_Z4funci(i32 %a) {
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entry:
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%call = call ptr @_Z10createTypev()
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%vtable = load ptr, ptr %call
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%0 = call i1 @llvm.public.type.test(ptr %vtable, metadata !"_ZTS7Derived")
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call void @llvm.assume(i1 %0)
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%1 = load ptr, ptr %vtable
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%call1 = call i32 %1(ptr %call, i32 %a)
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ret i32 %call1
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}
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declare ptr @_Z10createTypev()
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declare i1 @llvm.public.type.test(ptr, metadata)
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declare void @llvm.assume(i1)
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declare i32 @_ZN4Base4funcEi(ptr, i32)
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declare i32 @_ZN7Derived4funcEi(ptr , i32)
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!0 = !{i64 16, !"_ZTS4Base"}
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!1 = !{i64 16, !"_ZTSM4BaseFiiE.virtual"}
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!2 = !{i64 16, !"_ZTS7Derived"}
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!3 = !{i64 16, !"_ZTSM7DerivedFiiE.virtual"}
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