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
132 lines
4.1 KiB
YAML
132 lines
4.1 KiB
YAML
# Start after bbsections0-prepare and check if the right code is generated.
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# RUN: llc -mtriple x86_64-unknown-linux-gnu -start-after=bbsections-prepare %s -o - | FileCheck %s -check-prefix=CHECK
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# How to generate the input:
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# foo.cc
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# int foo(bool k) {
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# if (k) return 1;
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# return 0;
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# }
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#
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# clang -O0 -S -emit-llvm foo.cc
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# llc < foo.ll -stop-after=bbsections-prepare -basicblock-sections=all
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--- |
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; Function Attrs: noinline nounwind optnone uwtable
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define dso_local i32 @_Z3foob(i1 zeroext %0) #0 {
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%2 = alloca i32, align 4
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%3 = alloca i8, align 1
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%4 = zext i1 %0 to i8
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store i8 %4, i8* %3, align 1
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%5 = load i8, i8* %3, align 1
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%6 = trunc i8 %5 to i1
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br i1 %6, label %7, label %8
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7: ; preds = %1
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store i32 1, i32* %2, align 4
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br label %9
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8: ; preds = %1
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store i32 0, i32* %2, align 4
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br label %9
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9: ; preds = %8, %7
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%10 = load i32, i32* %2, align 4
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ret i32 %10
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}
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attributes #0 = { "frame-pointer"="all" "target-cpu"="x86-64" }
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...
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---
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name: _Z3foob
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alignment: 16
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exposesReturnsTwice: false
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legalized: false
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regBankSelected: false
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selected: false
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failedISel: false
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tracksRegLiveness: true
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hasWinCFI: false
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registers: []
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liveins:
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- { reg: '$edi', virtual-reg: '' }
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frameInfo:
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isFrameAddressTaken: false
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isReturnAddressTaken: false
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hasStackMap: false
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hasPatchPoint: false
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stackSize: 8
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offsetAdjustment: -8
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maxAlignment: 4
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adjustsStack: false
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hasCalls: false
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stackProtector: ''
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maxCallFrameSize: 0
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cvBytesOfCalleeSavedRegisters: 0
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hasOpaqueSPAdjustment: false
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hasVAStart: false
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hasMustTailInVarArgFunc: false
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localFrameSize: 0
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savePoint: ''
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restorePoint: ''
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fixedStack:
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- { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default,
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callee-saved-register: '', callee-saved-restored: true, debug-info-variable: '',
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debug-info-expression: '', debug-info-location: '' }
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stack:
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- { id: 0, type: default, offset: -24, size: 4,
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alignment: 4, stack-id: default, callee-saved-register: '', callee-saved-restored: true,
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debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
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- { id: 1, type: default, offset: -17, size: 1,
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alignment: 1, stack-id: default, callee-saved-register: '', callee-saved-restored: true,
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debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
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callSites: []
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constants: []
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machineFunctionInfo: {}
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body: |
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bb.0 (%ir-block.1, align 4, bbsections 0):
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successors: %bb.2(0x40000000), %bb.1(0x40000000)
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liveins: $edi
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frame-setup PUSH64r killed $rbp, implicit-def $rsp, implicit $rsp
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CFI_INSTRUCTION def_cfa_offset 16
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CFI_INSTRUCTION offset $rbp, -16
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$rbp = frame-setup MOV64rr $rsp
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CFI_INSTRUCTION def_cfa_register $rbp
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renamable $dil = AND8ri renamable $dil, 1, implicit-def dead $eflags, implicit killed $edi, implicit-def $edi
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MOV8mr $rbp, 1, $noreg, -1, $noreg, renamable $dil, implicit killed $edi :: (store 1 into %ir.3)
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TEST8mi $rbp, 1, $noreg, -1, $noreg, 1, implicit-def $eflags :: (load 1 from %ir.3)
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JCC_1 %bb.2, 4, implicit killed $eflags
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JMP_1 %bb.1
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bb.1 (%ir-block.7, bbsections 1):
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successors: %bb.3(0x80000000)
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MOV32mi $rbp, 1, $noreg, -8, $noreg, 1 :: (store 4 into %ir.2)
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JMP_1 %bb.3
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bb.2 (%ir-block.8, bbsections 2):
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successors: %bb.3(0x80000000)
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MOV32mi $rbp, 1, $noreg, -8, $noreg, 0 :: (store 4 into %ir.2)
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JMP_1 %bb.3
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bb.3 (%ir-block.9, bbsections 3):
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renamable $eax = MOV32rm $rbp, 1, $noreg, -8, $noreg :: (load 4 from %ir.2)
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$rbp = frame-destroy POP64r implicit-def $rsp, implicit $rsp
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CFI_INSTRUCTION def_cfa $rsp, 8
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RETQ implicit $eax
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...
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# CHECK: _Z3foob:
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# CHECK: .section .text,"ax",@progbits,unique
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# CHECK: _Z3foob.1:
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# CHECK: .section .text,"ax",@progbits,unique
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# CHECK: _Z3foob.2:
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# CHECK: .section .text,"ax",@progbits,unique
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# CHECK: _Z3foob.3:
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