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llvm-project/llvm/test/CodeGen/AArch64/xray-tail-call-sled.ll

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[XRay][AArch64] More staging for tail call support in XRay on AArch64 - in LLVM Summary: This patch prepares more for tail call support in XRay. Until the logging part supports tail calls, this is just staging, so it seems LLVM part is mostly ready with this patch. Related: https://reviews.llvm.org/D28948 (compiler-rt) Reviewers: dberris, rengolin Reviewed By: dberris Subscribers: llvm-commits, iid_iunknown, aemerson Differential Revision: https://reviews.llvm.org/D28947 llvm-svn: 293080
2017-01-26 04:21:49 +08:00
; RUN: llc -filetype=asm -o - -mtriple=aarch64-linux-gnu < %s | FileCheck %s
define i32 @callee() nounwind noinline uwtable "function-instrument"="xray-always" {
; CHECK: .p2align 2
; CHECK-LABEL: .Lxray_sled_0:
; CHECK-NEXT: b #32
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-LABEL: .Ltmp0:
ret i32 0
; CHECK-NEXT: mov w0, wzr
; CHECK-NEXT: .p2align 2
; CHECK-LABEL: .Lxray_sled_1:
; CHECK-NEXT: b #32
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-LABEL: .Ltmp1:
; CHECK-NEXT: ret
}
[XRay][CodeGen] Use PIC-friendly code in XRay sleds and remove synthetic references in .text Summary: This is a re-roll of D36615 which uses PLT relocations in the back-end to the call to __xray_CustomEvent() when building in -fPIC and -fxray-instrument mode. Reviewers: pcc, djasper, bkramer Subscribers: sdardis, javed.absar, llvm-commits Differential Revision: https://reviews.llvm.org/D37373 llvm-svn: 312466
2017-09-04 13:34:58 +08:00
; CHECK-LABEL: xray_instr_map
[XRay] Reduce synthetic references emitted by XRay Summary: When we're building with XRay instrumentation, we use a trick that preserves references from the function to a function sled index. This index table lives in a separate section, and without this trick the linker is free to garbage-collect this section and all the segments it refers to. Until we're able to tell the linkers to preserve these sections, we use this reference trick to keep around both the index and the entries in the instrumentation map. Before this change we emitted both a synthetic reference to the label in the instrumentation map, and to the entry in the function map index. This change removes the first synthetic reference and only emits one synthetic reference to the index -- the index entry has the references to the labels in the instrumentation map, so the linker will still preserve those if the function itself is preserved. This reduces the amount of synthetic references we emit from 16 bytes to just 8 bytes in x86_64, and similarly to other platforms. Reviewers: dblaikie Subscribers: javed.absar, kpw, pelikan, llvm-commits Differential Revision: https://reviews.llvm.org/D34340 llvm-svn: 305880
2017-06-21 14:39:42 +08:00
; CHECK-LABEL: Lxray_sleds_start0:
[XRay][AArch64] More staging for tail call support in XRay on AArch64 - in LLVM Summary: This patch prepares more for tail call support in XRay. Until the logging part supports tail calls, this is just staging, so it seems LLVM part is mostly ready with this patch. Related: https://reviews.llvm.org/D28948 (compiler-rt) Reviewers: dberris, rengolin Reviewed By: dberris Subscribers: llvm-commits, iid_iunknown, aemerson Differential Revision: https://reviews.llvm.org/D28947 llvm-svn: 293080
2017-01-26 04:21:49 +08:00
; CHECK: .xword .Lxray_sled_0
; CHECK: .xword .Lxray_sled_1
[XRay] Reduce synthetic references emitted by XRay Summary: When we're building with XRay instrumentation, we use a trick that preserves references from the function to a function sled index. This index table lives in a separate section, and without this trick the linker is free to garbage-collect this section and all the segments it refers to. Until we're able to tell the linkers to preserve these sections, we use this reference trick to keep around both the index and the entries in the instrumentation map. Before this change we emitted both a synthetic reference to the label in the instrumentation map, and to the entry in the function map index. This change removes the first synthetic reference and only emits one synthetic reference to the index -- the index entry has the references to the labels in the instrumentation map, so the linker will still preserve those if the function itself is preserved. This reduces the amount of synthetic references we emit from 16 bytes to just 8 bytes in x86_64, and similarly to other platforms. Reviewers: dblaikie Subscribers: javed.absar, kpw, pelikan, llvm-commits Differential Revision: https://reviews.llvm.org/D34340 llvm-svn: 305880
2017-06-21 14:39:42 +08:00
; CHECK-LABEL: Lxray_sleds_end0:
[XRay][CodeGen] Use PIC-friendly code in XRay sleds and remove synthetic references in .text Summary: This is a re-roll of D36615 which uses PLT relocations in the back-end to the call to __xray_CustomEvent() when building in -fPIC and -fxray-instrument mode. Reviewers: pcc, djasper, bkramer Subscribers: sdardis, javed.absar, llvm-commits Differential Revision: https://reviews.llvm.org/D37373 llvm-svn: 312466
2017-09-04 13:34:58 +08:00
; CHECK-LABEL: xray_fn_idx
[XRay] Reduce synthetic references emitted by XRay Summary: When we're building with XRay instrumentation, we use a trick that preserves references from the function to a function sled index. This index table lives in a separate section, and without this trick the linker is free to garbage-collect this section and all the segments it refers to. Until we're able to tell the linkers to preserve these sections, we use this reference trick to keep around both the index and the entries in the instrumentation map. Before this change we emitted both a synthetic reference to the label in the instrumentation map, and to the entry in the function map index. This change removes the first synthetic reference and only emits one synthetic reference to the index -- the index entry has the references to the labels in the instrumentation map, so the linker will still preserve those if the function itself is preserved. This reduces the amount of synthetic references we emit from 16 bytes to just 8 bytes in x86_64, and similarly to other platforms. Reviewers: dblaikie Subscribers: javed.absar, kpw, pelikan, llvm-commits Differential Revision: https://reviews.llvm.org/D34340 llvm-svn: 305880
2017-06-21 14:39:42 +08:00
; CHECK: .xword .Lxray_sleds_start0
; CHECK-NEXT: .xword .Lxray_sleds_end0
[XRay][AArch64] More staging for tail call support in XRay on AArch64 - in LLVM Summary: This patch prepares more for tail call support in XRay. Until the logging part supports tail calls, this is just staging, so it seems LLVM part is mostly ready with this patch. Related: https://reviews.llvm.org/D28948 (compiler-rt) Reviewers: dberris, rengolin Reviewed By: dberris Subscribers: llvm-commits, iid_iunknown, aemerson Differential Revision: https://reviews.llvm.org/D28947 llvm-svn: 293080
2017-01-26 04:21:49 +08:00
define i32 @caller() nounwind noinline uwtable "function-instrument"="xray-always" {
; CHECK: .p2align 2
[XRay] Reduce synthetic references emitted by XRay Summary: When we're building with XRay instrumentation, we use a trick that preserves references from the function to a function sled index. This index table lives in a separate section, and without this trick the linker is free to garbage-collect this section and all the segments it refers to. Until we're able to tell the linkers to preserve these sections, we use this reference trick to keep around both the index and the entries in the instrumentation map. Before this change we emitted both a synthetic reference to the label in the instrumentation map, and to the entry in the function map index. This change removes the first synthetic reference and only emits one synthetic reference to the index -- the index entry has the references to the labels in the instrumentation map, so the linker will still preserve those if the function itself is preserved. This reduces the amount of synthetic references we emit from 16 bytes to just 8 bytes in x86_64, and similarly to other platforms. Reviewers: dblaikie Subscribers: javed.absar, kpw, pelikan, llvm-commits Differential Revision: https://reviews.llvm.org/D34340 llvm-svn: 305880
2017-06-21 14:39:42 +08:00
; CHECK-LABEL: Lxray_sled_2:
[XRay][AArch64] More staging for tail call support in XRay on AArch64 - in LLVM Summary: This patch prepares more for tail call support in XRay. Until the logging part supports tail calls, this is just staging, so it seems LLVM part is mostly ready with this patch. Related: https://reviews.llvm.org/D28948 (compiler-rt) Reviewers: dberris, rengolin Reviewed By: dberris Subscribers: llvm-commits, iid_iunknown, aemerson Differential Revision: https://reviews.llvm.org/D28947 llvm-svn: 293080
2017-01-26 04:21:49 +08:00
; CHECK-NEXT: b #32
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-LABEL: .Ltmp2:
; CHECK: .p2align 2
[XRay] Reduce synthetic references emitted by XRay Summary: When we're building with XRay instrumentation, we use a trick that preserves references from the function to a function sled index. This index table lives in a separate section, and without this trick the linker is free to garbage-collect this section and all the segments it refers to. Until we're able to tell the linkers to preserve these sections, we use this reference trick to keep around both the index and the entries in the instrumentation map. Before this change we emitted both a synthetic reference to the label in the instrumentation map, and to the entry in the function map index. This change removes the first synthetic reference and only emits one synthetic reference to the index -- the index entry has the references to the labels in the instrumentation map, so the linker will still preserve those if the function itself is preserved. This reduces the amount of synthetic references we emit from 16 bytes to just 8 bytes in x86_64, and similarly to other platforms. Reviewers: dblaikie Subscribers: javed.absar, kpw, pelikan, llvm-commits Differential Revision: https://reviews.llvm.org/D34340 llvm-svn: 305880
2017-06-21 14:39:42 +08:00
; CHECK-LABEL: Lxray_sled_3:
[XRay][AArch64] More staging for tail call support in XRay on AArch64 - in LLVM Summary: This patch prepares more for tail call support in XRay. Until the logging part supports tail calls, this is just staging, so it seems LLVM part is mostly ready with this patch. Related: https://reviews.llvm.org/D28948 (compiler-rt) Reviewers: dberris, rengolin Reviewed By: dberris Subscribers: llvm-commits, iid_iunknown, aemerson Differential Revision: https://reviews.llvm.org/D28947 llvm-svn: 293080
2017-01-26 04:21:49 +08:00
; CHECK-NEXT: b #32
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-NEXT: nop
; CHECK-LABEL: .Ltmp3:
%retval = tail call i32 @callee()
; CHECK: b callee
ret i32 %retval
}
[XRay][CodeGen] Use PIC-friendly code in XRay sleds and remove synthetic references in .text Summary: This is a re-roll of D36615 which uses PLT relocations in the back-end to the call to __xray_CustomEvent() when building in -fPIC and -fxray-instrument mode. Reviewers: pcc, djasper, bkramer Subscribers: sdardis, javed.absar, llvm-commits Differential Revision: https://reviews.llvm.org/D37373 llvm-svn: 312466
2017-09-04 13:34:58 +08:00
; CHECK-LABEL: xray_instr_map
[XRay] Reduce synthetic references emitted by XRay Summary: When we're building with XRay instrumentation, we use a trick that preserves references from the function to a function sled index. This index table lives in a separate section, and without this trick the linker is free to garbage-collect this section and all the segments it refers to. Until we're able to tell the linkers to preserve these sections, we use this reference trick to keep around both the index and the entries in the instrumentation map. Before this change we emitted both a synthetic reference to the label in the instrumentation map, and to the entry in the function map index. This change removes the first synthetic reference and only emits one synthetic reference to the index -- the index entry has the references to the labels in the instrumentation map, so the linker will still preserve those if the function itself is preserved. This reduces the amount of synthetic references we emit from 16 bytes to just 8 bytes in x86_64, and similarly to other platforms. Reviewers: dblaikie Subscribers: javed.absar, kpw, pelikan, llvm-commits Differential Revision: https://reviews.llvm.org/D34340 llvm-svn: 305880
2017-06-21 14:39:42 +08:00
; CHECK-LABEL: Lxray_sleds_start1:
[XRay][AArch64] More staging for tail call support in XRay on AArch64 - in LLVM Summary: This patch prepares more for tail call support in XRay. Until the logging part supports tail calls, this is just staging, so it seems LLVM part is mostly ready with this patch. Related: https://reviews.llvm.org/D28948 (compiler-rt) Reviewers: dberris, rengolin Reviewed By: dberris Subscribers: llvm-commits, iid_iunknown, aemerson Differential Revision: https://reviews.llvm.org/D28947 llvm-svn: 293080
2017-01-26 04:21:49 +08:00
; CHECK: .xword .Lxray_sled_2
; CHECK: .xword .Lxray_sled_3
[XRay] Reduce synthetic references emitted by XRay Summary: When we're building with XRay instrumentation, we use a trick that preserves references from the function to a function sled index. This index table lives in a separate section, and without this trick the linker is free to garbage-collect this section and all the segments it refers to. Until we're able to tell the linkers to preserve these sections, we use this reference trick to keep around both the index and the entries in the instrumentation map. Before this change we emitted both a synthetic reference to the label in the instrumentation map, and to the entry in the function map index. This change removes the first synthetic reference and only emits one synthetic reference to the index -- the index entry has the references to the labels in the instrumentation map, so the linker will still preserve those if the function itself is preserved. This reduces the amount of synthetic references we emit from 16 bytes to just 8 bytes in x86_64, and similarly to other platforms. Reviewers: dblaikie Subscribers: javed.absar, kpw, pelikan, llvm-commits Differential Revision: https://reviews.llvm.org/D34340 llvm-svn: 305880
2017-06-21 14:39:42 +08:00
; CHECK-LABEL: Lxray_sleds_end1:
[XRay] Create an Index of sleds per function Summary: This change adds a new section to the xray-instrumented binary that stores an index into ranges of the instrumentation map, where sleds associated with the same function can be accessed as an array. At runtime, we can get access to this index by function ID offset allowing for selective patching and unpatching by function ID. Each entry in this new section (xray_fn_idx) will include two pointers indicating the start and one past the end of the sleds associated with the same function. These entries will be 16 bytes long on x86 and aarch64. On arm, we align to 16 bytes anyway so the runtime has to take that into consideration. __{start,stop}_xray_fn_idx will be the symbols that the runtime will look for when we implement the selective patching/unpatching by function id APIs. Because XRay synthesizes the function id's in a monotonically increasing manner at runtime now, implementations (and users) can use this table to look up the sleds associated with a specific function. This is useful in implementations that want to do things like: - Implement coverage mode for functions by patching everything pre-main, then as functions are encountered, the installed handler can unpatch the function that's been encountered after recording that it's been called. - Do "learning mode", so that the implementation can figure out some statistical information about function calls by function id for a time being, and then determine which functions are worth uninstrumenting at runtime. - Do "selective instrumentation" where an implementation can specifically instrument only certain function id's at runtime (either based on some external data, or through some other heuristics) instead of patching all the instrumented functions at runtime. Reviewers: dblaikie, echristo, chandlerc, javed.absar Subscribers: pelikan, aemerson, kpw, llvm-commits, rengolin Differential Revision: https://reviews.llvm.org/D32693 llvm-svn: 302109
2017-05-04 11:37:57 +08:00
; CHECK: .section xray_fn_idx,{{.*}}
[XRay] Reduce synthetic references emitted by XRay Summary: When we're building with XRay instrumentation, we use a trick that preserves references from the function to a function sled index. This index table lives in a separate section, and without this trick the linker is free to garbage-collect this section and all the segments it refers to. Until we're able to tell the linkers to preserve these sections, we use this reference trick to keep around both the index and the entries in the instrumentation map. Before this change we emitted both a synthetic reference to the label in the instrumentation map, and to the entry in the function map index. This change removes the first synthetic reference and only emits one synthetic reference to the index -- the index entry has the references to the labels in the instrumentation map, so the linker will still preserve those if the function itself is preserved. This reduces the amount of synthetic references we emit from 16 bytes to just 8 bytes in x86_64, and similarly to other platforms. Reviewers: dblaikie Subscribers: javed.absar, kpw, pelikan, llvm-commits Differential Revision: https://reviews.llvm.org/D34340 llvm-svn: 305880
2017-06-21 14:39:42 +08:00
; CHECK: .xword .Lxray_sleds_start1
; CHECK-NEXT: .xword .Lxray_sleds_end1