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llvm-project/llvm/test/CodeGen/X86/xray-custom-log.ll

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[XRay] Custom event logging intrinsic This patch introduces an LLVM intrinsic and a target opcode for custom event logging in XRay. Initially, its use case will be to allow users of XRay to log some type of string ("poor man's printf"). The target opcode compiles to a noop sled large enough to enable calling through to a runtime-determined relative function call. At runtime, when X-Ray is enabled, the sled is replaced by compiler-rt with a trampoline to the logic for creating the custom log entries. Future patches will implement the compiler-rt parts and clang-side support for emitting the IR corresponding to this intrinsic. Reviewers: timshen, dberris Subscribers: igorb, pelikan, rSerge, timshen, echristo, dberris, llvm-commits Differential Revision: https://reviews.llvm.org/D27503 llvm-svn: 302405
2017-05-08 13:45:21 +08:00
; RUN: llc -filetype=asm -o - -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s
define i32 @fn() nounwind noinline uwtable "function-instrument"="xray-always" {
%eventptr = alloca i8
%eventsize = alloca i32
store i32 3, i32* %eventsize
%val = load i32, i32* %eventsize
call void @llvm.xray.customevent(i8* %eventptr, i32 %val)
; CHECK-LABEL: Lxray_event_sled_0:
Revert r311525: "[XRay][CodeGen] Use PIC-friendly code in XRay sleds; remove synthetic references in .text" Breaks builds internally. Will forward repo instructions to author. llvm-svn: 312243
2017-08-31 23:17:17 +08:00
; CHECK-NEXT: .ascii "\353\024
; CHECK-NEXT: pushq %rax
[XRay] Custom event logging intrinsic This patch introduces an LLVM intrinsic and a target opcode for custom event logging in XRay. Initially, its use case will be to allow users of XRay to log some type of string ("poor man's printf"). The target opcode compiles to a noop sled large enough to enable calling through to a runtime-determined relative function call. At runtime, when X-Ray is enabled, the sled is replaced by compiler-rt with a trampoline to the logic for creating the custom log entries. Future patches will implement the compiler-rt parts and clang-side support for emitting the IR corresponding to this intrinsic. Reviewers: timshen, dberris Subscribers: igorb, pelikan, rSerge, timshen, echristo, dberris, llvm-commits Differential Revision: https://reviews.llvm.org/D27503 llvm-svn: 302405
2017-05-08 13:45:21 +08:00
; CHECK-NEXT: movq {{.*}}, %rdi
; CHECK-NEXT: movq {{.*}}, %rsi
Revert r311525: "[XRay][CodeGen] Use PIC-friendly code in XRay sleds; remove synthetic references in .text" Breaks builds internally. Will forward repo instructions to author. llvm-svn: 312243
2017-08-31 23:17:17 +08:00
; CHECK-NEXT: movabsq $__xray_CustomEvent, %rax
; CHECK-NEXT: callq *%rax
; CHECK-NEXT: popq %rax
[XRay] Custom event logging intrinsic This patch introduces an LLVM intrinsic and a target opcode for custom event logging in XRay. Initially, its use case will be to allow users of XRay to log some type of string ("poor man's printf"). The target opcode compiles to a noop sled large enough to enable calling through to a runtime-determined relative function call. At runtime, when X-Ray is enabled, the sled is replaced by compiler-rt with a trampoline to the logic for creating the custom log entries. Future patches will implement the compiler-rt parts and clang-side support for emitting the IR corresponding to this intrinsic. Reviewers: timshen, dberris Subscribers: igorb, pelikan, rSerge, timshen, echristo, dberris, llvm-commits Differential Revision: https://reviews.llvm.org/D27503 llvm-svn: 302405
2017-05-08 13:45:21 +08:00
ret i32 0
}
Revert r311525: "[XRay][CodeGen] Use PIC-friendly code in XRay sleds; remove synthetic references in .text" Breaks builds internally. Will forward repo instructions to author. llvm-svn: 312243
2017-08-31 23:17:17 +08:00
; CHECK: .section {{.*}}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] Custom event logging intrinsic This patch introduces an LLVM intrinsic and a target opcode for custom event logging in XRay. Initially, its use case will be to allow users of XRay to log some type of string ("poor man's printf"). The target opcode compiles to a noop sled large enough to enable calling through to a runtime-determined relative function call. At runtime, when X-Ray is enabled, the sled is replaced by compiler-rt with a trampoline to the logic for creating the custom log entries. Future patches will implement the compiler-rt parts and clang-side support for emitting the IR corresponding to this intrinsic. Reviewers: timshen, dberris Subscribers: igorb, pelikan, rSerge, timshen, echristo, dberris, llvm-commits Differential Revision: https://reviews.llvm.org/D27503 llvm-svn: 302405
2017-05-08 13:45:21 +08:00
; CHECK: .quad {{.*}}xray_event_sled_0
declare void @llvm.xray.customevent(i8*, i32)