athirumu@torrent:~/git/lldb$ cd tools/lldb/test/lang/c/strings
athirumu@torrent:~/git/lldb/tools/lldb/test/lang/c/strings$ make
make: `a.out' is up to date.
athirumu@torrent:~/git/lldb/tools/lldb/test/lang/c/strings$ lldb a.out
Current executable set to 'a.out' (x86_64).
(lldb) breakpoint set -f main.c -l 25                                                                                                                                                                                                    Breakpoint 1: where = a.out`main + 28 at main.c:24, address = 0x000000000040058c
(lldb) r
Process 3999 launched: '/home/athirumu/git/lldb/tools/lldb/test/lang/c/strings/a.out' (x86_64)
Process 3999 stopped
* thread #1: tid = 0x0f9f, 0x00000000004005b1 a.out`main + 65 at main.c:25, stop reason = step over
    frame #0: 0x00000000004005b1 a.out`main + 65 at main.c:25
   22     const char *z = "vwxyz";
   23
   24     printf("%s %d", a, (int)do_test(a)); // breakpoint 1
-> 25   }
(lldb) expr (size_t)strlen("hello")                                                                                                                                                                                                          (size_t) $1 = 140509107248080
(lldb) log enable lldb expr                                                                                                                                                                                                                  (lldb) expr (long)strlen("hello")
== [ClangUserExpression::Evaluate] Parsing expression (long)strlen("hello") ==
ClangUserExpression::ScanContext()
Parsing the following code:

#undef NULL
#undef Nil
#undef nil
#undef YES
#undef NO
#define NULL ((int)0)
#define Nil ((Class)0)
#define nil ((id)0)
#define YES ((BOOL)1)
#define NO ((BOOL)0)
typedef int BOOL;
typedef unsigned short unichar;

void
$__lldb_expr(void *$__lldb_arg)
{
    (long)strlen("hello");
}

LayoutRecordType[6] on (RecordDecl*)0xb8e190 [name = '_objc_super']
LayoutRecordType[7] on (RecordDecl*)0xb8e190 [name = '_message_ref_t']
FindExternalLexicalDecls[3] on (ASTContext*)0xb8e190 in (TranslationUnitDecl*)0xbe5f80 with null predicate
ClangExpressionDeclMap::FindExternalVisibleDecls[18] for '$__lldb_arg' in a 'TranslationUnit'
  CEDM::FEVD[18] Searching the root namespace
ClangASTSource::FindExternalVisibleDecls[18] on (ASTContext*)0xb8e190 for '$__lldb_arg' in a 'TranslationUnit'
  CAS::FEVD[18] Searching the root namespace
ClangExpressionDeclMap::FindExternalVisibleDecls[19] for '$__lldb_expr' in a 'TranslationUnit'
  CEDM::FEVD[19] Searching the root namespace
ClangASTSource::FindExternalVisibleDecls[19] on (ASTContext*)0xb8e190 for '$__lldb_expr' in a 'TranslationUnit'
  CAS::FEVD[19] Searching the root namespace
ClangExpressionDeclMap::FindExternalVisibleDecls[20] for 'strlen' in a 'TranslationUnit'
  CEDM::FEVD[20] Searching the root namespace
  CEDM::FEVD[20] Found generic function strlen (description libc.so.6`strlen), returned static <unknown type> strlen(...)
ClangASTSource::FindExternalVisibleDecls[20] on (ASTContext*)0xb8e190 for 'strlen' in a 'TranslationUnit'
  CAS::FEVD[20] Searching the root namespace
Last statement is an rvalue with type: long
Found function _Z12$__lldb_exprPv for $__lldb_expr
Module as passed in to IRForTarget:
"; ModuleID = '$__lldb_module'
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64--linux"

@"_ZZ12$__lldb_exprPvE19$__lldb_expr_result" = internal global i64 0, align 8
@"_ZGVZ12$__lldb_exprPvE19$__lldb_expr_result" = internal global i8 0
@.str = private unnamed_addr constant [6 x i8] c"hello\00", align 1

define void @"_Z12$__lldb_exprPv"(i8* %"$__lldb_arg") nounwind {
entry:
  %"$__lldb_arg.addr" = alloca i8*, align 8, !clang.decl.ptr !7
  store i8* %"$__lldb_arg", i8** %"$__lldb_arg.addr", align 8
  %0 = load i8* @"_ZGVZ12$__lldb_exprPvE19$__lldb_expr_result", align 1
  %guard.uninitialized = icmp eq i8 %0, 0
  br i1 %guard.uninitialized, label %init.check, label %init.end

init.check:                                       ; preds = %entry
  %call = call i64 (...)* @_ZL6strlenz(i8* getelementptr inbounds ([6 x i8]* @.str, i32 0, i32 0))
  store i64 %call, i64* @"_ZZ12$__lldb_exprPvE19$__lldb_expr_result", align 8
  store i8 1, i8* @"_ZGVZ12$__lldb_exprPvE19$__lldb_expr_result"
  br label %init.end

init.end:                                         ; preds = %init.check, %entry
  ret void
}

declare i64 @_ZL6strlenz(...)

!clang.global.decl.ptrs = !{!0, !1, !2, !0}
!llvm.module.flags = !{!3, !4, !5, !6}

!0 = metadata !{i64* @"_ZZ12$__lldb_exprPvE19$__lldb_expr_result", i64 12945312}
!1 = metadata !{i64 (...)* @_ZL6strlenz, i64 12944496}
!2 = metadata !{void (i8*)* @"_Z12$__lldb_exprPv", i64 12944272}
!3 = metadata !{i32 1, metadata !"Objective-C Version", i32 2}
!4 = metadata !{i32 1, metadata !"Objective-C Image Info Version", i32 0}
!5 = metadata !{i32 1, metadata !"Objective-C Image Info Section", metadata !"__DATA, __objc_imageinfo, regular, no_dead_strip"}
!6 = metadata !{i32 4, metadata !"Objective-C Garbage Collection", i32 0}
!7 = metadata !{i64 12944080}
"
Result name: "_ZZ12$__lldb_exprPvE19$__lldb_expr_result"
Found result in the IR: "@"_ZZ12$__lldb_exprPvE19$__lldb_expr_result" = internal global i64 0, align 8"
Found result decl: "static long $__lldb_expr_result(long)strlen("hello")"
Result decl type: "long"
Creating a new result global: "$3" with size 0x8
Replacing "@"_ZZ12$__lldb_exprPvE19$__lldb_expr_result" = internal global i64 0, align 8" with "@"$3" = external global i64"
Created persistent variable with flags 0x15
Unsupported instruction: %call = call i64 (...)* @_ZL6strlenz(i8* getelementptr inbounds ([6 x i8]* @.str, i32 0, i32 0))
Examining non-declaration function _Z12$__lldb_exprPv
Examining declaration function _ZL6strlenz
Found "_ZL6strlenz" at 0x7fcad35f40a0
MaybeHandleCallArguments(  %call = call i64 (...)* inttoptr (i64 140509106356384 to i64 (...)*)(i8* getelementptr inbounds ([6 x i8]* @.str, i32 0, i32 0)), !lldb.call.realName !8)
MaybeHandleVariable (i8* getelementptr inbounds ([6 x i8]* @.str, i32 0, i32 0))
MaybeHandleVariable (@.str = private unnamed_addr constant [6 x i8] c"hello\00", align 1)
Examining _ZGVZ12$__lldb_exprPvE19$__lldb_expr_result, DeclForGlobalValue returns (nil)
Examining reloc_placeholder, DeclForGlobalValue returns (nil)
Examining $3, DeclForGlobalValue returns 0xc587a0
MaybeHandleVariable (@"$3" = external global i64)
Type of "$__lldb_expr_result" is [clang "long *", llvm "i64**"] [size 8, align 8]
Adding value for (NamedDecl*)0xc587a0 [$__lldb_expr_result - $3] to the structure
Element arrangement:
Arg: "i8* %"$__lldb_arg""
  "$3" ("$__lldb_expr_result") placed at 0
    Replacing [@"$3" = external global i64]
Total structure [align 8, size 8]
Allocated static data at 0x7fcad3b47000
Did remove @"_ZGVZ12$__lldb_exprPvE19$__lldb_expr_result" = internal global i8 0
Instrumenting load/store instruction:   %2 = load i64** %1

Instrumenting load/store instruction:   store i8* %"$__lldb_arg", i8** %"$__lldb_arg.addr", align 8

Instrumenting load/store instruction:   store i64 %call, i64* %3, align 8

Module being sent to JIT:
; ModuleID = '$__lldb_module'
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64--linux"

define void @"_Z12$__lldb_exprPv"(i8* %"$__lldb_arg") nounwind {
entry:
  %0 = getelementptr i8* %"$__lldb_arg", i32 0
  %1 = bitcast i8* %0 to i64**
  %2 = bitcast i64** %1 to i8*
  call void (i8*, ...)* inttoptr (i64 140509111934976 to void (i8*, ...)*)(i8* %2)
  %3 = load i64** %1
  %"$__lldb_arg.addr" = alloca i8*, align 8, !clang.decl.ptr !7
  %4 = bitcast i8** %"$__lldb_arg.addr" to i8*
  call void (i8*, ...)* inttoptr (i64 140509111934976 to void (i8*, ...)*)(i8* %4)
  store i8* %"$__lldb_arg", i8** %"$__lldb_arg.addr", align 8
  %guard.uninitialized = icmp eq i8 0, 0
  br i1 %guard.uninitialized, label %init.check, label %init.end

init.check:                                       ; preds = %entry
  %call = call i64 (...)* inttoptr (i64 140509106356384 to i64 (...)*)(i8* getelementptr inbounds ([6 x i8]* inttoptr (i64 140509111939072 to [6 x i8]*), i32 0, i32 0)), !lldb.call.realName !8
  %5 = bitcast i64* %3 to i8*
  call void (i8*, ...)* inttoptr (i64 140509111934976 to void (i8*, ...)*)(i8* %5)
  store i64 %call, i64* %3, align 8
  br label %init.end

init.end:                                         ; preds = %init.check, %entry
  ret void
}

declare i64 @_ZL6strlenz(...)

!clang.global.decl.ptrs = !{!0, !1, !2, !0, !0}
!llvm.module.flags = !{!3, !4, !5, !6}

!0 = metadata !{null, i64 12945312}
!1 = metadata !{i64 (...)* inttoptr (i64 140509106356384 to i64 (...)*), i64 12944496}
!2 = metadata !{void (i8*)* @"_Z12$__lldb_exprPv", i64 12944272}
!3 = metadata !{i32 1, metadata !"Objective-C Version", i32 2}
!4 = metadata !{i32 1, metadata !"Objective-C Image Info Version", i32 0}
!5 = metadata !{i32 1, metadata !"Objective-C Image Info Section", metadata !"__DATA, __objc_imageinfo, regular, no_dead_strip"}
!6 = metadata !{i32 4, metadata !"Objective-C Garbage Collection", i32 0}
!7 = metadata !{i64 12944080}
!8 = metadata !{[12 x i8] c"_ZL6strlenz\00"}

RecordingMemoryManager::allocateCodeSection(Size=0x62, Alignment=16, SectionID=0) = 0x7f3a985e0008
[0x7f3a985e0008+0x62]->0x0 (alignment 16, section ID 0)
RecordingMemoryManager::CommitAllocations() committed an allocation
[0x7f3a985e0008+0x62]->0x7fcad3b46120 (alignment 16, section ID 0)
RecordingMemoryManager::CommitAllocations() wrote an allocation
[0x7f3a985e0008+0x62]->0x7fcad3b46120 (alignment 16, section ID 0)
Code can be run in the target.
Found function, has local address 0x7f3a985e0008 and remote address 0x7fcad3b46120
Function's code range is [0x7fcad3b46120+0x62]
Function data has contents:
0x7fcad3b46120: 55 41 57 41 56 53 50 48 89 fb 40 30 ed 49 bf 00
0x7fcad3b46130: 60 b4 d3 ca 7f 00 00 30 c0 41 ff d7 4c 8b 33 48
0x7fcad3b46140: 8d 3c 24 30 c0 41 ff d7 48 89 1c 24 40 84 ed 75
0x7fcad3b46150: 26 48 b9 a0 40 5f d3 ca 7f 00 00 48 bf 00 70 b4
0x7fcad3b46160: d3 ca 7f 00 00 30 c0 ff d1 48 89 c3 4c 89 f7 30
0x7fcad3b46170: c0 41 ff d7 49 89 1e 48 83 c4 08 5b 41 5e 41 5f
0x7fcad3b46180: 5d c3
Function disassembly:
0x7fcad3b46120:  55                             pushq  %rbp
0x7fcad3b46121:  41 57                          pushq  %r15
0x7fcad3b46123:  41 56                          pushq  %r14
0x7fcad3b46125:  53                             pushq  %rbx
0x7fcad3b46126:  50                             pushq  %rax
0x7fcad3b46127:  48 89 fb                       movq   %rdi, %rbx
0x7fcad3b4612a:  40 30 ed                       xorb   %bpl, %bpl
0x7fcad3b4612d:  49 bf 00 60 b4 d3 ca 7f 00 00  movabsq$140509111934976, %r15
0x7fcad3b46137:  30 c0                          xorb   %al, %al
0x7fcad3b46139:  41 ff d7                       callq  *%r15
0x7fcad3b4613c:  4c 8b 33                       movq   (%rbx), %r14
0x7fcad3b4613f:  48 8d 3c 24                    leaq   (%rsp), %rdi
0x7fcad3b46143:  30 c0                          xorb   %al, %al
0x7fcad3b46145:  41 ff d7                       callq  *%r15
0x7fcad3b46148:  48 89 1c 24                    movq   %rbx, (%rsp)
0x7fcad3b4614c:  40 84 ed                       testb  %bpl, %bpl
0x7fcad3b4614f:  75 26                          jne    0x7fcad3b46177
0x7fcad3b46151:  48 b9 a0 40 5f d3 ca 7f 00 00  movabsq$140509106356384, %rcx
0x7fcad3b4615b:  48 bf 00 70 b4 d3 ca 7f 00 00  movabsq$140509111939072, %rdi
0x7fcad3b46165:  30 c0                          xorb   %al, %al
0x7fcad3b46167:  ff d1                          callq  *%rcx
0x7fcad3b46169:  48 89 c3                       movq   %rax, %rbx
0x7fcad3b4616c:  4c 89 f7                       movq   %r14, %rdi
0x7fcad3b4616f:  30 c0                          xorb   %al, %al
0x7fcad3b46171:  41 ff d7                       callq  *%r15
0x7fcad3b46174:  49 89 1e                       movq   %rbx, (%r14)
0x7fcad3b46177:  48 83 c4 08                    addq   $8, %rsp
0x7fcad3b4617b:  5b                             popq   %rbx
0x7fcad3b4617c:  41 5e                          popq   %r14
0x7fcad3b4617e:  41 5f                          popq   %r15
0x7fcad3b46180:  5d                             popq   %rbp
0x7fcad3b46181:  c3                             ret

Data buffer contents:
0x7fcad3b47000: 68 65 6c 6c 6f 00                                hello.

== [ClangUserExpression::Evaluate] Executing expression ==
Allocating memory for materialized argument struct
Found result member in the struct
Materializing persistent variable with flags 0x15
Allocated $3 (0x7fcad3b47040) sucessfully
Materialized $3 into 0x7fcad3b47040
-- [ClangUserExpression::PrepareToExecuteJITExpression] Materializing for execution --
  Function address  : 0x7fcad3b46120
  Structure address : 0x7fcad3b47010
  Structure contents:
[$3]
0x7fcad3b47010: 40 70 b4 d3 ca 7f 00 00                          @p......

ABISysV_x86_64::PrepareTrivialCall
(
  thread = 0x7f3a840008c0
  sp = 0x7fffa85c0040
  func_addr = 0x7fcad3b46120
  return_addr = 0x400460
  arg1_ptr = 0x7fff27f7f990 (0x7fcad3b47010)
  arg2_ptr = (nil) (0x0)
  arg3_ptr = (nil) (0x0)
)
About to write arg1 (0x7fcad3b47010) into rdi
16-byte aligning SP: 0x7fffa85c0040 to 0x7fffa85c0040
Pushing the return address onto the stack: new SP 0x7fffa85c0038, return address 0x400460
Writing SP (0x7fffa85c0038) down
Writing new IP (0x7fcad3b46120) down
-- [ClangUserExpression::Execute] Execution of expression begins --
-- [ClangUserExpression::Execute] Execution of expression completed --
-- [ClangUserExpression::FinalizeJITExecution] Dematerializing after execution --
  Structure contents:
[$3]
0x7fcad3b47010: 40 70 b4 d3 ca 7f 00 00                          @p......

Found result member in the struct
Dematerializing persistent variable with flags 0x15
Dematerializing $3 from 0x7fcad3b47040 (size = 8)
== [ClangUserExpression::Evaluate] Execution completed normally with result 140509107248080 ==
    [ClangASTImporter] Forgetting destination (ASTContext*)0xb8e190
    [ClangASTImporter] Forgetting source->dest (ASTContext*)0xb8e190->(ASTContext*)0xb31560
(long) $3 = 140509107248080
(lldb)