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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
86 lines
1.8 KiB
LLVM
86 lines
1.8 KiB
LLVM
; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
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; CHECK-LABEL: .section __LLVM_STACKMAPS,__llvm_stackmaps
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; CHECK-NEXT: __LLVM_StackMaps:
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; version
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; CHECK-NEXT: .byte 2
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; reserved
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; CHECK-NEXT: .byte 0
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; reserved
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; CHECK-NEXT: .short 0
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; # functions
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; CHECK-NEXT: .long 2
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; # constants
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; CHECK-NEXT: .long 2
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; # records
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; CHECK-NEXT: .long 2
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; function address & stack size
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; CHECK-NEXT: .quad _foo
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; CHECK-NEXT: .quad 8
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; CHECK-NEXT: .quad 1
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; function address & stack size
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; CHECK-NEXT: .quad _bar
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; CHECK-NEXT: .quad 8
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; CHECK-NEXT: .quad 1
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; Constants Array:
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; CHECK-NEXT: .quad 9223372036854775807
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; CHECK-NEXT: .quad -9223372036854775808
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; Patchpoint ID
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; CHECK-NEXT: .quad 0
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; Instruction offset
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; CHECK-NEXT: .long L{{.*}}-_foo
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; reserved
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; CHECK-NEXT: .short 0
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; # locations
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; CHECK-NEXT: .short 1
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; ConstantIndex
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; CHECK-NEXT: .byte 5
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; reserved
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; CHECK-NEXT: .byte 8
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; Dwarf RegNum
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; CHECK-NEXT: .short 0
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; Offset
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; CHECK-NEXT: .long 0
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; padding
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; CHECK-NEXT: .short 0
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; NumLiveOuts
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; CHECK-NEXT: .short 0
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; CHECK-NEXT: .p2align 3
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declare void @llvm.experimental.stackmap(i64, i32, ...)
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define void @foo() {
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tail call void (i64, i32, ...) @llvm.experimental.stackmap(i64 0, i32 0, i64 9223372036854775807)
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ret void
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}
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; Patchpoint ID
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; CHECK-NEXT: .quad 0
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; Instruction Offset
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; CHECK-NEXT: .long L{{.*}}-_bar
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; reserved
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; CHECK-NEXT: .short 0
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; # locations
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; CHECK-NEXT: .short 1
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; ConstantIndex
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; CHECK-NEXT: .byte 5
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; reserved
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; CHECK-NEXT: .byte 8
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; Dwarf RegNum
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; CHECK-NEXT: .short 0
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; Offset
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; CHECK-NEXT: .long 1
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; padding
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; CHECK-NEXT: .short 0
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; NumLiveOuts
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; CHECK-NEXT: .short 0
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define void @bar() {
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tail call void (i64, i32, ...) @llvm.experimental.stackmap(i64 0, i32 0, i64 -9223372036854775808)
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ret void
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}
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