//===----------------------------------------------------------------------===//
//
/// \file
-/// \brief Insert two S_NOP instructions for every high level source statement.
+/// \brief Insert two nop instructions for each high level source statement.
///
/// Tools, such as debugger, need to pause execution based on user input (i.e.
-/// breakpoint). In order to do this, two S_NOP instructions are inserted for
-/// each high level source statement: one before first isa instruction of high
-/// level source statement, and one after last isa instruction of high level
-/// source statement. Further, debugger may replace S_NOP instructions with
-/// S_TRAP instructions based on user input.
+/// breakpoint). In order to do this, two nop instructions are inserted for each
+/// high level source statement: one before first isa instruction of high level
+/// source statement, and one after last isa instruction of high level source
+/// statement. Further, debugger may replace nop instructions with trap
+/// instructions based on user input.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
using namespace llvm;
#define DEBUG_TYPE "si-insert-nops"
}
bool SIInsertNops::runOnMachineFunction(MachineFunction &MF) {
+ // Skip machine functions without debug info.
+ if (!MF.getMMI().hasDebugInfo()) {
+ return false;
+ }
+
+ // Target instruction info.
const SIInstrInfo *TII =
static_cast<const SIInstrInfo*>(MF.getSubtarget().getInstrInfo());
+ // Mapping from high level source statement line number to last corresponding
+ // isa instruction.
DenseMap<unsigned, MachineBasicBlock::iterator> LineToInst;
+ // Insert nop instruction before first isa instruction of each high level
+ // source statement and collect last isa instruction for each high level
+ // source statement.
for (auto MBB = MF.begin(); MBB != MF.end(); ++MBB) {
for (auto MI = MBB->begin(); MI != MBB->end(); ++MI) {
if (MI->isDebugValue() || !MI->getDebugLoc()) {
}
}
}
+ // Insert nop instruction after last isa instruction of each high level source
+ // statement.
for (auto LineToInstEntry = LineToInst.begin();
LineToInstEntry != LineToInst.end(); ++LineToInstEntry) {
auto MBB = LineToInstEntry->second->getParent();
.addImm(0);
}
}
+ // Insert nop instruction before prologue.
MachineBasicBlock &MBB = MF.front();
MachineInstr &MI = MBB.front();
BuildMI(MBB, MI, DebugLoc(), TII->get(AMDGPU::S_NOP))
--- /dev/null
+; RUN: llc -mtriple=amdgcn--amdhsa -mcpu=fiji -mattr=+amdgpu-debugger-insert-nops -verify-machineinstrs < %s | FileCheck %s
+
+; CHECK: debugger_insert_nops.cl:2:3
+; CHECK-NEXT: s_nop 0
+; CHECK: debugger_insert_nops.cl:3:3
+; CHECK-NEXT: s_nop 0
+; CHECK: debugger_insert_nops.cl:4:3
+; CHECK-NEXT: s_nop 0
+; CHECK: debugger_insert_nops.cl:5:3
+; CHECK-NEXT: s_nop 0
+; CHECK: debugger_insert_nops.cl:6:1
+; CHECK-NEXT: s_nop 0
+; CHECK-NEXT: s_endpgm
+
+; Function Attrs: nounwind
+define void @debugger_insert_nops(i32 addrspace(1)* %A) #0 !dbg !12 {
+entry:
+ %A.addr = alloca i32 addrspace(1)*, align 4
+ store i32 addrspace(1)* %A, i32 addrspace(1)** %A.addr, align 4
+ call void @llvm.dbg.declare(metadata i32 addrspace(1)** %A.addr, metadata !17, metadata !18), !dbg !19
+ %0 = load i32 addrspace(1)*, i32 addrspace(1)** %A.addr, align 4, !dbg !20
+ %arrayidx = getelementptr inbounds i32, i32 addrspace(1)* %0, i32 0, !dbg !20
+ store i32 1, i32 addrspace(1)* %arrayidx, align 4, !dbg !21
+ %1 = load i32 addrspace(1)*, i32 addrspace(1)** %A.addr, align 4, !dbg !22
+ %arrayidx1 = getelementptr inbounds i32, i32 addrspace(1)* %1, i32 1, !dbg !22
+ store i32 2, i32 addrspace(1)* %arrayidx1, align 4, !dbg !23
+ %2 = load i32 addrspace(1)*, i32 addrspace(1)** %A.addr, align 4, !dbg !24
+ %arrayidx2 = getelementptr inbounds i32, i32 addrspace(1)* %2, i32 2, !dbg !24
+ store i32 3, i32 addrspace(1)* %arrayidx2, align 4, !dbg !25
+ %3 = load i32 addrspace(1)*, i32 addrspace(1)** %A.addr, align 4, !dbg !26
+ %arrayidx3 = getelementptr inbounds i32, i32 addrspace(1)* %3, i32 4, !dbg !26
+ store i32 4, i32 addrspace(1)* %arrayidx3, align 4, !dbg !27
+ ret void, !dbg !28
+}
+
+; Function Attrs: nounwind readnone
+declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
+
+attributes #0 = { nounwind "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="fiji" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { nounwind readnone }
+
+!llvm.dbg.cu = !{!0}
+!opencl.kernels = !{!3}
+!llvm.module.flags = !{!9, !10}
+!llvm.ident = !{!11}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.9.0 (trunk 266620)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
+!1 = !DIFile(filename: "debugger_insert_nops.cl", directory: "/home/kzhuravl/Sandbox")
+!2 = !{}
+!3 = !{void (i32 addrspace(1)*)* @debugger_insert_nops, !4, !5, !6, !7, !8}
+!4 = !{!"kernel_arg_addr_space", i32 1}
+!5 = !{!"kernel_arg_access_qual", !"none"}
+!6 = !{!"kernel_arg_type", !"int*"}
+!7 = !{!"kernel_arg_base_type", !"int*"}
+!8 = !{!"kernel_arg_type_qual", !""}
+!9 = !{i32 2, !"Dwarf Version", i32 4}
+!10 = !{i32 2, !"Debug Info Version", i32 3}
+!11 = !{!"clang version 3.9.0 (trunk 266620)"}
+!12 = distinct !DISubprogram(name: "debugger_insert_nops", scope: !1, file: !1, line: 1, type: !13, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
+!13 = !DISubroutineType(types: !14)
+!14 = !{null, !15}
+!15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !16, size: 64, align: 32)
+!16 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
+!17 = !DILocalVariable(name: "A", arg: 1, scope: !12, file: !1, line: 1, type: !15)
+!18 = !DIExpression()
+!19 = !DILocation(line: 1, column: 46, scope: !12)
+!20 = !DILocation(line: 2, column: 3, scope: !12)
+!21 = !DILocation(line: 2, column: 8, scope: !12)
+!22 = !DILocation(line: 3, column: 3, scope: !12)
+!23 = !DILocation(line: 3, column: 8, scope: !12)
+!24 = !DILocation(line: 4, column: 3, scope: !12)
+!25 = !DILocation(line: 4, column: 8, scope: !12)
+!26 = !DILocation(line: 5, column: 3, scope: !12)
+!27 = !DILocation(line: 5, column: 8, scope: !12)
+!28 = !DILocation(line: 6, column: 1, scope: !12)