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https://github.com/RPCSX/llvm.git
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9becdeed48
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 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281532 91177308-0d34-0410-b5e6-96231b3b80d8
170 lines
4.5 KiB
LLVM
170 lines
4.5 KiB
LLVM
; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=corei7 | FileCheck %s
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; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=corei7 -fast-isel -fast-isel-abort=1 | 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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; 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 4
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; Num LargeConstants
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; CHECK-NEXT: .long 3
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; Num Callsites
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; CHECK-NEXT: .long 7
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; Functions and stack size
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; CHECK-NEXT: .quad _constantargs
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; CHECK-NEXT: .quad 8
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; CHECK-NEXT: .quad 1
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; CHECK-NEXT: .quad _liveConstant
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; CHECK-NEXT: .quad 8
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; CHECK-NEXT: .quad 1
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; CHECK-NEXT: .quad _directFrameIdx
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; CHECK-NEXT: .quad 40
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; CHECK-NEXT: .quad 1
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; CHECK-NEXT: .quad _longid
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; CHECK-NEXT: .quad 8
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; CHECK-NEXT: .quad 4
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; Large Constants
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; CHECK-NEXT: .quad 2147483648
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; CHECK-NEXT: .quad 4294967295
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; CHECK-NEXT: .quad 4294967296
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; Callsites
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; Constant arguments
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;
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; CHECK-NEXT: .quad 1
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; CHECK-NEXT: .long L{{.*}}-_constantargs
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; CHECK-NEXT: .short 0
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; CHECK-NEXT: .short 12
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; SmallConstant
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; CHECK-NEXT: .byte 4
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; CHECK-NEXT: .byte 8
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; CHECK-NEXT: .short 0
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; CHECK-NEXT: .long -1
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; SmallConstant
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; CHECK-NEXT: .byte 4
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; CHECK-NEXT: .byte 8
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; CHECK-NEXT: .short 0
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; CHECK-NEXT: .long -1
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; SmallConstant
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; CHECK-NEXT: .byte 4
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; CHECK-NEXT: .byte 8
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; CHECK-NEXT: .short 0
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; CHECK-NEXT: .long 65536
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; SmallConstant
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; CHECK-NEXT: .byte 4
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; CHECK-NEXT: .byte 8
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; CHECK-NEXT: .short 0
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; CHECK-NEXT: .long 2000000000
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; SmallConstant
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; CHECK-NEXT: .byte 4
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; CHECK-NEXT: .byte 8
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; CHECK-NEXT: .short 0
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; CHECK-NEXT: .long 2147483647
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; SmallConstant
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; CHECK-NEXT: .byte 4
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; CHECK-NEXT: .byte 8
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; CHECK-NEXT: .short 0
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; CHECK-NEXT: .long -1
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; SmallConstant
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; CHECK-NEXT: .byte 4
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; CHECK-NEXT: .byte 8
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; CHECK-NEXT: .short 0
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; CHECK-NEXT: .long -1
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; SmallConstant
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; CHECK-NEXT: .byte 4
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; CHECK-NEXT: .byte 8
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; CHECK-NEXT: .short 0
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; CHECK-NEXT: .long 0
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; LargeConstant at index 0
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; CHECK-NEXT: .byte 5
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; CHECK-NEXT: .byte 8
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; CHECK-NEXT: .short 0
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; CHECK-NEXT: .long 0
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; LargeConstant at index 1
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; CHECK-NEXT: .byte 5
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; CHECK-NEXT: .byte 8
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; CHECK-NEXT: .short 0
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; CHECK-NEXT: .long 1
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; LargeConstant at index 2
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; CHECK-NEXT: .byte 5
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; CHECK-NEXT: .byte 8
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; CHECK-NEXT: .short 0
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; CHECK-NEXT: .long 2
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; SmallConstant
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; CHECK-NEXT: .byte 4
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; CHECK-NEXT: .byte 8
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; CHECK-NEXT: .short 0
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; CHECK-NEXT: .long -1
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define void @constantargs() {
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entry:
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tail call void (i64, i32, ...) @llvm.experimental.stackmap(i64 1, i32 15, i16 65535, i16 -1, i32 65536, i32 2000000000, i32 2147483647, i32 -1, i32 4294967295, i32 4294967296, i64 2147483648, i64 4294967295, i64 4294967296, i64 -1)
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ret void
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}
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; Map a constant value.
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;
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; CHECK-LABEL: .long L{{.*}}-_liveConstant
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; CHECK-NEXT: .short 0
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; 1 location
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; CHECK-NEXT: .short 1
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; Loc 0: SmallConstant
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; CHECK-NEXT: .byte 4
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; CHECK-NEXT: .byte 8
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; CHECK-NEXT: .short 0
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; CHECK-NEXT: .long 33
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define void @liveConstant() {
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tail call void (i64, i32, ...) @llvm.experimental.stackmap(i64 15, i32 5, i32 33)
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ret void
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}
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; Directly map an alloca's address.
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;
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; Callsite 16
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; CHECK-LABEL: .long L{{.*}}-_directFrameIdx
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; CHECK-NEXT: .short 0
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; 1 location
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; CHECK-NEXT: .short 1
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; Loc 0: Direct RBP - ofs
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; CHECK-NEXT: .byte 2
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; CHECK-NEXT: .byte 8
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; CHECK-NEXT: .short 6
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; CHECK-NEXT: .long
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define void @directFrameIdx() {
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entry:
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%metadata1 = alloca i64, i32 3, align 8
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store i64 11, i64* %metadata1
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store i64 12, i64* %metadata1
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store i64 13, i64* %metadata1
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call void (i64, i32, ...) @llvm.experimental.stackmap(i64 16, i32 0, i64* %metadata1)
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ret void
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}
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; Test a 64-bit ID.
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;
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; CHECK: .quad 4294967295
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; CHECK-LABEL: .long L{{.*}}-_longid
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; CHECK: .quad 4294967296
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; CHECK-LABEL: .long L{{.*}}-_longid
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; CHECK: .quad 9223372036854775807
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; CHECK-LABEL: .long L{{.*}}-_longid
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; CHECK: .quad -1
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; CHECK-LABEL: .long L{{.*}}-_longid
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define void @longid() {
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entry:
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tail call void (i64, i32, ...) @llvm.experimental.stackmap(i64 4294967295, i32 0)
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tail call void (i64, i32, ...) @llvm.experimental.stackmap(i64 4294967296, i32 0)
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tail call void (i64, i32, ...) @llvm.experimental.stackmap(i64 9223372036854775807, i32 0)
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tail call void (i64, i32, ...) @llvm.experimental.stackmap(i64 -1, i32 0)
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ret void
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}
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declare void @llvm.experimental.stackmap(i64, i32, ...)
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