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58149dbd85
Summary: It was previously not possible for tools to use solely the stackmap information emitted to reconstruct the return addresses of callsites in the map, which is necessary to use the information to walk a stack. This patch adds per-function callsite counts when emitting the stackmap section in order to resolve the problem. Note that this slightly alters the stackmap format, so external tools parsing these maps will need to be updated. **Problem Details:** Records only store their offset from the beginning of the function they belong to. While these records and the functions are output in program order, it is not possible to determine where the end of one function's records are without the callsite count when processing the records to compute return addresses. Patch by Kavon Farvardin! Reviewers: atrick, ributzka, sanjoy Subscribers: nemanjai Differential Revision: https://reviews.llvm.org/D23487 llvm-svn: 281532
47 lines
1.2 KiB
LLVM
47 lines
1.2 KiB
LLVM
; RUN: llc < %s -mtriple=aarch64-apple-darwin | FileCheck %s
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target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
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; CHECK-LABEL: .section __LLVM_STACKMAPS,__llvm_stackmaps
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; CHECK-NEXT: __LLVM_StackMaps:
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; Header
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; CHECK-NEXT: .byte 2
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; CHECK-NEXT: .byte 0
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; CHECK-NEXT: .short 0
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; Num Functions
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; CHECK-NEXT: .long 1
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; Num LargeConstants
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; CHECK-NEXT: .long 0
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; Num Callsites
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; CHECK-NEXT: .long 1
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; Functions and stack size
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; CHECK-NEXT: .quad _stackmap_liveness
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; CHECK-NEXT: .quad 16
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; Test that the return register is recognized as an live-out.
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define i64 @stackmap_liveness(i1 %c) {
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; CHECK-LABEL: .long L{{.*}}-_stackmap_liveness
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; CHECK-NEXT: .short 0
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; CHECK-NEXT: .short 0
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; Padding
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; CHECK-NEXT: .short 0
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; Num LiveOut Entries: 1
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; CHECK-NEXT: .short 2
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; LiveOut Entry 0: X0
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; CHECK-NEXT: .short 0
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; CHECK-NEXT: .byte 0
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; CHECK-NEXT: .byte 8
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; LiveOut Entry 1: SP
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; CHECK-NEXT: .short 31
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; CHECK-NEXT: .byte 0
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; CHECK-NEXT: .byte 8
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; Align
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; CHECK-NEXT: .p2align 3
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%1 = select i1 %c, i64 1, i64 2
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call anyregcc void (i64, i32, i8*, i32, ...) @llvm.experimental.patchpoint.void(i64 1, i32 32, i8* null, i32 0)
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ret i64 %1
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}
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declare void @llvm.experimental.patchpoint.void(i64, i32, i8*, i32, ...)
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