c8ac29ab1d
Today symbol names generated for machine basic block sections use a unary encoding to reduce bloat. This is essential when every basic block in the binary is assigned a symbol however with basic block clusters (rG05192e585ce175b55f2a26b83b4ed7882785c8e6) when we only need to generate a few non-temporary symbols we can assign more descriptive names making them more user friendly. With this change - Cold cluster section for function foo is named "foo.cold" Exception cluster section for function foo is named "foo.eh" Other cluster sections identified by their ids are named "foo.ID" Using this format works well with existing tools. It will demangle as expected and works with existing symbolizers, profilers and debuggers out of the box. $ c++filt _Z3foov.cold foo() [clone .cold] $ c++filt _Z3foov.eh foo() [clone .eh] $c++filt _Z3foov.1234 foo() [clone 1234] Tests for basicblock-sections are updated with some cleanup where appropriate. Differential Revision: https://reviews.llvm.org/D79221
86 lines
3.0 KiB
LLVM
86 lines
3.0 KiB
LLVM
; Check if landing pads are kept in a separate eh section
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; RUN: llc < %s -mtriple=i386-unknown-linux-gnu -function-sections -basicblock-sections=all -unique-bb-section-names | FileCheck %s -check-prefix=LINUX-SECTIONS
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@_ZTIb = external constant i8*
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define i32 @_Z3foob(i1 zeroext %0) #0 personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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%2 = alloca i32, align 4
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%3 = alloca i8, align 1
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%4 = alloca i8*
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%5 = alloca i32
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%6 = alloca i8, align 1
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%7 = zext i1 %0 to i8
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store i8 %7, i8* %3, align 1
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%8 = load i8, i8* %3, align 1
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%9 = trunc i8 %8 to i1
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br i1 %9, label %10, label %11
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10: ; preds = %1
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store i32 1, i32* %2, align 4
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br label %31
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11: ; preds = %1
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%12 = call i8* @__cxa_allocate_exception(i64 1) #2
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%13 = load i8, i8* %3, align 1
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%14 = trunc i8 %13 to i1
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%15 = zext i1 %14 to i8
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store i8 %15, i8* %12, align 16
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invoke void @__cxa_throw(i8* %12, i8* bitcast (i8** @_ZTIb to i8*), i8* null) #3
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to label %38 unwind label %16
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16: ; preds = %11
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%17 = landingpad { i8*, i32 }
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catch i8* bitcast (i8** @_ZTIb to i8*)
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%18 = extractvalue { i8*, i32 } %17, 0
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store i8* %18, i8** %4, align 8
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%19 = extractvalue { i8*, i32 } %17, 1
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store i32 %19, i32* %5, align 4
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br label %20
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20: ; preds = %16
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%21 = load i32, i32* %5, align 4
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%22 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIb to i8*)) #2
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%23 = icmp eq i32 %21, %22
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br i1 %23, label %24, label %33
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24: ; preds = %20
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%25 = load i8*, i8** %4, align 8
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%26 = call i8* @__cxa_begin_catch(i8* %25) #2
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%27 = load i8, i8* %26, align 1
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%28 = trunc i8 %27 to i1
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%29 = zext i1 %28 to i8
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store i8 %29, i8* %6, align 1
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call void @__cxa_end_catch() #2
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br label %30
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30: ; preds = %24
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store i32 0, i32* %2, align 4
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br label %31
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31: ; preds = %30, %10
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%32 = load i32, i32* %2, align 4
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ret i32 %32
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33: ; preds = %20
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%34 = load i8*, i8** %4, align 8
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%35 = load i32, i32* %5, align 4
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%36 = insertvalue { i8*, i32 } undef, i8* %34, 0
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%37 = insertvalue { i8*, i32 } %36, i32 %35, 1
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resume { i8*, i32 } %37
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38: ; preds = %11
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unreachable
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}
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declare i8* @__cxa_allocate_exception(i64)
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declare void @__cxa_throw(i8*, i8*, i8*)
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declare i32 @__gxx_personality_v0(...)
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; Function Attrs: nounwind readnone
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declare i32 @llvm.eh.typeid.for(i8*) #1
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declare i8* @__cxa_begin_catch(i8*)
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declare void @__cxa_end_catch()
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;LINUX-SECTIONS: .section .text._Z3foob,"ax",@progbits
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;LINUX-SECTIONS: _Z3foob:
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;LINUX-SECTIONS: .section .text._Z3foob._Z3foob.{{[0-9]+}},"ax",@progbits
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;LINUX-SECTIONS-LABEL: _Z3foob.{{[0-9]+}}:
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;LINUX-SECTIONS: calll __cxa_begin_catch
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