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[llvm/DebugInfo] Emit DW_OP_implicit_value when tuning for LLDB

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This patch enables emitting DWARF `DW_OP_implicit_value` opcode when
tuning debug information for LLDB (`-debugger-tune=lldb`).

This will also propagate to Darwin platforms, since they use LLDB tuning
as a default.

rdar://67406059

Differential Revision: https://reviews.llvm.org/D90001

Signed-off-by: Med Ismail Bennani <medismail.bennani@gmail.com>
This commit is contained in:
Med Ismail Bennani 2020-10-23 04:17:07 +02:00
parent 243529579b
commit b398ab2619
4 changed files with 25 additions and 6 deletions
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3
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -2480,7 +2480,8 @@ void DwarfDebug::emitDebugLocValue(const AsmPrinter &AP, const DIBasicType *BT,
DwarfExpr.addExpression(std::move(ExprCursor));
return;
} else if (Value.isConstantFP()) {
if (AP.getDwarfVersion() >= 4 && AP.getDwarfDebug()->tuneForGDB()) {
if (AP.getDwarfVersion() >= 4 && (AP.getDwarfDebug()->tuneForGDB() ||
AP.getDwarfDebug()->tuneForLLDB())) {
DwarfExpr.addConstantFP(Value.getConstantFP()->getValueAPF(), AP);
return;
} else if (Value.getConstantFP()

11
test/DebugInfo/X86/implicit_value-double.ll
View File

@ -1,7 +1,8 @@
;; This test checks for emission of DW_OP_implicit_value operation
;; for double type.
; RUN: llc -debugger-tune=gdb -filetype=obj %s -o - | llvm-dwarfdump - | FileCheck %s
; RUN: llc -debugger-tune=gdb -filetype=obj %s -o - | llvm-dwarfdump - | FileCheck %s
; RUN: llc -debugger-tune=lldb -filetype=obj %s -o - | llvm-dwarfdump - | FileCheck %s
; CHECK: .debug_info contents:
; CHECK: DW_TAG_variable
@ -9,6 +10,14 @@
; CHECK-NEXT: [{{.*}}): DW_OP_implicit_value 0x8 0x1f 0x85 0xeb 0x51 0xb8 0x1e 0x09 0x40)
; CHECK-NEXT: DW_AT_name ("d")
; RUN: llc -debugger-tune=sce -filetype=obj %s -o - | llvm-dwarfdump - | FileCheck %s -check-prefix=SCE-CHECK
; SCE-CHECK: .debug_info contents:
; SCE-CHECK: DW_TAG_variable
; SCE-CHECK-NEXT: DW_AT_location ({{.*}}
; SCE-CHECK-NEXT: [{{.*}}): DW_OP_constu 0x40091eb851eb851f, DW_OP_stack_value)
; SCE-CHECK-NEXT: DW_AT_name ("d")
;; Generated from: clang -ggdb -O1
;;int main() {
;; double d = 3.14;

11
test/DebugInfo/X86/implicit_value-float.ll
View File

@ -1,7 +1,8 @@
;; This test checks for emission of DW_OP_implicit_value operation
;; for float type.
; RUN: llc -debugger-tune=gdb -filetype=obj %s -o - | llvm-dwarfdump - | FileCheck %s
; RUN: llc -debugger-tune=gdb -filetype=obj %s -o - | llvm-dwarfdump - | FileCheck %s
; RUN: llc -debugger-tune=lldb -filetype=obj %s -o - | llvm-dwarfdump - | FileCheck %s
; CHECK: .debug_info contents:
; CHECK: DW_TAG_variable
@ -9,6 +10,14 @@
; CHECK-NEXT: [{{.*}}): DW_OP_implicit_value 0x4 0xc3 0xf5 0x48 0x40)
; CHECK-NEXT: DW_AT_name ("f")
; RUN: llc -debugger-tune=sce -filetype=obj %s -o - | llvm-dwarfdump - | FileCheck %s -check-prefix=SCE-CHECK
; SCE-CHECK: .debug_info contents:
; SCE-CHECK: DW_TAG_variable
; SCE-CHECK-NEXT: DW_AT_location ({{.*}}
; SCE-CHECK-NEXT: [{{.*}}): DW_OP_constu 0x4048f5c3, DW_OP_stack_value)
; SCE-CHECK-NEXT: DW_AT_name ("f")
;; Generated from: clang -ggdb -O1
;;int main() {
;; float f = 3.14f;

6
test/DebugInfo/X86/stack-value-piece.ll
View File

@ -26,15 +26,15 @@
; CHECK: DW_AT_name ("f")
; CHECK: DW_TAG_variable
; CHECK-NEXT: DW_AT_location ([[F:0x[0-9a-f]+]]
; CHECK-NEXT: [{{.*}}, {{.*}}): DW_OP_reg17 XMM0, DW_OP_piece 0x4, DW_OP_lit0, DW_OP_stack_value, DW_OP_piece 0x4
; CHECK-NEXT: [{{.*}}, {{.*}}): DW_OP_piece 0x4, DW_OP_lit0, DW_OP_stack_value, DW_OP_piece 0x4)
; CHECK-NEXT: [{{.*}}, {{.*}}): DW_OP_reg17 XMM0, DW_OP_piece 0x4, {{(DW_OP_lit0, DW_OP_stack_value, DW_OP_piece 0x4|DW_OP_implicit_value 0x4 0x00 0x00 0x00 0x00)}}
; CHECK-NEXT: [{{.*}}, {{.*}}): DW_OP_piece 0x4, {{(DW_OP_lit0, DW_OP_stack_value, DW_OP_piece 0x4|DW_OP_implicit_value 0x4 0x00 0x00 0x00 0x00)}})
; CHECK-NEXT: DW_AT_name ("r")
;
; CHECK: .debug_loc contents:
; CHECK: [[I]]:
; CHECK-NEXT: ({{.*}}, {{.*}}): DW_OP_reg5 RDI, DW_OP_piece 0x4, DW_OP_lit0, DW_OP_stack_value, DW_OP_piece 0x4
; CHECK: [[F]]:
; CHECK-NEXT: ({{.*}}, {{.*}}): DW_OP_reg17 XMM0, DW_OP_piece 0x4, DW_OP_lit0, DW_OP_stack_value, DW_OP_piece 0x4
; CHECK-NEXT: ({{.*}}, {{.*}}): DW_OP_reg17 XMM0, DW_OP_piece 0x4, {{DW_OP_lit0, DW_OP_stack_value, DW_OP_piece 0x4|DW_OP_implicit_value 0x4 0x00 0x00 0x00 0x00}}
source_filename = "stack-value-piece.c"
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"