Dmitry Mikushin
2012-Dec-25 06:18 UTC
[LLVMdev] [DragonEgg] Strange call to @"\01__isoc99_fscanf"
Dear all,
First of all, Merry Christmas! :)
While testing a File I/O sample program, I've encountered a link failure
due to missing implementation of "\01__isoc99_fscanf" function. I
think
this function should be named "__isoc99_fscanf" instead. Please see
the
program code and LLVM IR generated by DragonEgg and clang below. It shows
that clang generates "__isoc99_fscanf", while DragonEgg gives
"\01__isoc99_fscanf". We generally use DragonEgg as our compiler
frontend,
so it is more important. What could be the reason of "\01" issue?
Thanks,
- Dima.
marcusmae at M17xR4:~/forge/kernelgen/tests/behavior/fileio$ cat fileio.c
#include <inttypes.h>
#include <stdio.h>
const char* filename = "fileio.txt";
int main(int argc, char* argv[])
{
if (argc != 2)
{
printf("Test KernelGen support for File I/O\n");
printf("Usage: %s <szarray>\n", argv[0]);
return 0;
}
size_t szarray = (size_t)strtoumax(argv[1], NULL, 0);
// Write data to file.
FILE* wfile = fopen(filename, "w");
if (!wfile)
{
fprintf(stderr, "Cannot open output file %s\n", filename);
return 1;
}
for (int i = 0; i < szarray; i++)
fprintf(wfile, "%d ", i);
fclose(wfile);
// Read data from file.
FILE* rfile = fopen(filename, "r");
if (!rfile)
{
fprintf(stderr, "Cannot open input file %s\n", filename);
return 1;
}
for (int i = 0; i < szarray; i++)
{
int val;
fscanf(rfile, "%d", &val);
printf("%d ", val);
}
printf("\n");
fclose(rfile);
return 0;
}
marcusmae at M17xR4:~/forge/kernelgen/tests/behavior/fileio$
kernelgen-dragonegg -v -std=c99 fileio.c -o-
Using built-in specs.
COLLECT_GCC=kernelgen-gfortran
COLLECT_LTO_WRAPPER=/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.6.4/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../configure
--prefix=/home/marcusmae/rpmbuild/BUILDROOT/opt/kernelgen
--program-prefix=kernelgen- --enable-languages=fortran,c++
--with-mpfr-include=/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/include/
--with-mpfr-lib=/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/lib
--with-gmp-include=/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/include/
--with-gmp-lib=/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/lib
--with-mpc-include=/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/include/
--with-mpc-lib=/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/lib
--enable-plugin --enable-gold=default --disable-ld
--with-ld=/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/bin/kernelgen-ld
--disable-bootstrap
Thread model: posix
gcc version 4.6.4 20120720 (prerelease) (GCC)
COLLECT_GCC_OPTIONS='-fplugin=dragonegg.so'
'-fplugin-arg-dragonegg-emit-ir'
'-fplugin-arg-dragonegg-llvm-ir-optimize=0' '-S' '-v'
'-std=c99' '-o' '-'
'-mtune=generic' '-march=x86-64'
/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.6.4/cc1
-quiet -v -imultilib . -imultiarch x86_64-linux-gnu -iprefix
/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.4/
-iplugindir=/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.4/plugin
fileio.c
-iplugindir=/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.4/plugin
-quiet -dumpbase fileio.c -mtune=generic -march=x86-64 -auxbase-strip -
-std=c99 -version -fplugin=dragonegg.so -fplugin-arg-dragonegg-emit-ir
-fplugin-arg-dragonegg-llvm-ir-optimize=0 -o -
GNU C (GCC) version 4.6.4 20120720 (prerelease) (x86_64-unknown-linux-gnu)
compiled by GNU C version 4.6.4 20120720 (prerelease), GMP version
5.0.5, MPFR version 3.1.1, MPC version 1.0.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Versions of loaded plugins:
dragonegg: 3.2svn
ignoring nonexistent directory
"/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.4/../../../../x86_64-unknown-linux-gnu/include"
ignoring duplicate directory
"/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/bin/../lib/gcc/../../lib/gcc/x86_64-unknown-linux-gnu/4.6.4/include"
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring duplicate directory
"/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/bin/../lib/gcc/../../lib/gcc/x86_64-unknown-linux-gnu/4.6.4/include-fixed"
ignoring nonexistent directory
"/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/bin/../lib/gcc/../../lib/gcc/x86_64-unknown-linux-gnu/4.6.4/../../../../x86_64-unknown-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.4/include
/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.4/include-fixed
/usr/local/include
/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/bin/../lib/gcc/../../include
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
GNU C (GCC) version 4.6.4 20120720 (prerelease) (x86_64-unknown-linux-gnu)
compiled by GNU C version 4.6.4 20120720 (prerelease), GMP version
5.0.5, MPFR version 3.1.1, MPC version 1.0.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Versions of loaded plugins:
dragonegg: 3.2svn
Compiler executable checksum: 64cde6062a88e8edfe37057c679689e2
; ModuleID = 'fileio.c'
target datalayout
"e-p:64:64:64-S128-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f16:16:16-f32:32:32-f64:64:64-f128:128:128-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-unknown-linux-gnu"
%struct._IO_FILE = type { i32, i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*,
i8*, i8*, %struct._IO_marker*, %struct._IO_FILE*, i32, i32, i64, i16, i8,
[1 x i8], i8*, i64, i8*, i8*, i8*, i8*, i64, i32, [20 x i8] }
%struct._IO_marker = type { %struct._IO_marker*, %struct._IO_FILE*, i32, [4
x i8] }
@filename = unnamed_addr global i8* getelementptr inbounds ([11 x i8]*
@.cst, i64 0, i64 0)
@.cst = linker_private constant [11 x i8] c"fileio.txt\00", align 8
@.cst1 = linker_private constant [36 x i8] c"Test KernelGen support for
File I/O\00", align 64
@.cst2 = linker_private constant [21 x i8] c"Usage: %s
<szarray>\0A\00",
align 8
@.cst3 = linker_private constant [2 x i8] c"w\00", align 8
@.cst4 = linker_private constant [28 x i8] c"Cannot open output file
%s\0A\00", align 8
@stderr = external global %struct._IO_FILE*
@.cst5 = linker_private constant [4 x i8] c"%d \00", align 8
@.cst6 = linker_private constant [2 x i8] c"r\00", align 8
@.cst7 = linker_private constant [27 x i8] c"Cannot open input file
%s\0A\00", align 8
@.cst8 = linker_private constant [3 x i8] c"%d\00", align 8
define i32 @main(i32 %argc, i8** %argv) nounwind uwtable {
entry:
%argc_addr = alloca i32, align 4
%argv_addr = alloca i8**, align 8
%szarray = alloca i64
%wfile = alloca %struct._IO_FILE*
%rfile = alloca %struct._IO_FILE*
%i = alloca i32
%i1 = alloca i32
%val = alloca i32
%"<retval>" = alloca i32
%"alloca point" = bitcast i32 0 to i32
store i32 %argc, i32* %argc_addr
store i8** %argv, i8*** %argv_addr
%0 = load i32* %argc_addr, align 32
%1 = load i8*** %argv_addr, align 64
%"ssa point" = bitcast i32 0 to i32
br label %"2"
"2": ; preds = %entry
%2 = icmp ne i32 %0, 2
br i1 %2, label %"3", label %"4"
"3": ; preds =
%"2"
%3 = call i32 @puts(i8* getelementptr inbounds ([36 x i8]* @.cst1, i64 0,
i64 0)) nounwind
%4 = load i8** %1, align 8
%5 = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([21 x i8]*
@.cst2, i64 0, i64 0), i8* %4) nounwind
br label %"15"
"4": ; preds =
%"2"
%6 = bitcast i8** %1 to i8*
%7 = getelementptr i8* %6, i64 8
%8 = bitcast i8* %7 to i8**
%9 = load i8** %8, align 8
%10 = call i64 @strtoumax(i8* noalias %9, i8** noalias null, i32 0)
nounwind
%11 = load i8** @filename, align 8
%12 = call %struct._IO_FILE* @fopen(i8* noalias %11, i8* noalias
getelementptr inbounds ([2 x i8]* @.cst3, i64 0, i64 0)) nounwind
%13 = icmp eq %struct._IO_FILE* %12, null
br i1 %13, label %"5", label %"6"
"5": ; preds =
%"4"
%14 = load i8** @filename, align 8
%15 = load %struct._IO_FILE** @stderr, align 8
%16 = call i32 (%struct._IO_FILE*, i8*, ...)* @fprintf(%struct._IO_FILE*
noalias %15, i8* noalias getelementptr inbounds ([28 x i8]* @.cst4, i64 0,
i64 0), i8* %14) nounwind
br label %"15"
"6": ; preds =
%"4"
br label %"8"
"7": ; preds =
%"8"
%17 = call i32 (%struct._IO_FILE*, i8*, ...)* @fprintf(%struct._IO_FILE*
noalias %12, i8* noalias getelementptr inbounds ([4 x i8]* @.cst5, i64 0,
i64 0), i32 %19) nounwind
%18 = add i32 %19, 1
br label %"8"
"8": ; preds =
%"7", %"6"
%19 = phi i32 [ %18, %"7" ], [ 0, %"6" ]
%20 = sext i32 %19 to i64
%21 = icmp ult i64 %20, %10
br i1 %21, label %"7", label %"9"
"9": ; preds =
%"8"
%22 = call i32 @fclose(%struct._IO_FILE* %12) nounwind
%23 = load i8** @filename, align 8
%24 = call %struct._IO_FILE* @fopen(i8* noalias %23, i8* noalias
getelementptr inbounds ([2 x i8]* @.cst6, i64 0, i64 0)) nounwind
%25 = icmp eq %struct._IO_FILE* %24, null
br i1 %25, label %"10", label %"11"
"10": ; preds =
%"9"
%26 = load i8** @filename, align 8
%27 = load %struct._IO_FILE** @stderr, align 8
%28 = call i32 (%struct._IO_FILE*, i8*, ...)* @fprintf(%struct._IO_FILE*
noalias %27, i8* noalias getelementptr inbounds ([27 x i8]* @.cst7, i64 0,
i64 0), i8* %26) nounwind
br label %"15"
"11": ; preds =
%"9"
br label %"13"
"12": ; preds =
%"13"
%29 = call i32 (%struct._IO_FILE*, i8*, ...)*
@"\01__isoc99_fscanf"(%struct._IO_FILE* noalias %24, i8* noalias
getelementptr inbounds ([3 x i8]* @.cst8, i64 0, i64 0), i32* %val) nounwind
%30 = load i32* %val, align 4
%31 = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([4 x i8]*
@.cst5, i64 0, i64 0), i32 %30) nounwind
%32 = add i32 %33, 1
br label %"13"
"13": ; preds =
%"12", %"11"
%33 = phi i32 [ %32, %"12" ], [ 0, %"11" ]
%34 = sext i32 %33 to i64
%35 = icmp ult i64 %34, %10
br i1 %35, label %"12", label %"14"
"14": ; preds =
%"13"
%36 = call i32 @putchar(i32 10) nounwind
%37 = call i32 @fclose(%struct._IO_FILE* %24) nounwind
br label %"15"
"15": ; preds =
%"14", %"10",
%"5", %"3"
%38 = phi i32 [ 0, %"14" ], [ 1, %"10" ], [ 1,
%"5" ], [ 0, %"3" ]
store i32 %38, i32* %"<retval>", align 1
br label %return
return: ; preds = %"15"
%retval = load i32* %"<retval>"
ret i32 %retval
}
declare i32 @puts(i8*)
declare i32 @printf(i8*, ...)
declare i64 @strtoumax(i8* noalias, i8** noalias, i32) nounwind
declare %struct._IO_FILE* @fopen(i8* noalias, i8* noalias)
declare i32 @fprintf(%struct._IO_FILE* noalias, i8* noalias, ...)
declare i32 @fclose(%struct._IO_FILE*)
declare i32 @"\01__isoc99_fscanf"(%struct._IO_FILE* noalias, i8*
noalias,
...)
declare i32 @putchar(i32)
COMPILER_PATH=/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.6.4/:/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/bin/../libexec/gcc/:/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.4/../../../../x86_64-unknown-linux-gnu/bin/
LIBRARY_PATH=/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.4/:/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/bin/../lib/gcc/:/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.4/../../../../lib64/:/lib/x86_64-linux-gnu/:/lib/../lib64/:/usr/lib/x86_64-linux-gnu/:/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.4/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-fplugin=dragonegg.so'
'-fplugin-arg-dragonegg-emit-ir'
'-fplugin-arg-dragonegg-llvm-ir-optimize=0' '-S' '-v'
'-std=c99' '-o' '-'
'-mtune=generic' '-march=x86-64'
marcusmae at M17xR4:~/forge/kernelgen/tests/behavior/fileio$ clang -cc1
-I/usr/include
-I/home/marcusmae/rpmbuild/CHROOT/opt/kernelgen/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.4/include
-emit-llvm -std=c99 fileio.c -o-
; ModuleID = 'fileio.c'
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-unknown-linux-gnu"
%struct._IO_FILE = type { i32, i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*,
i8*, i8*, %struct._IO_marker*, %struct._IO_FILE*, i32, i32, i64, i16, i8,
[1 x i8], i8*, i64, i8*, i8*, i8*, i8*, i64, i32, [20 x i8] }
%struct._IO_marker = type { %struct._IO_marker*, %struct._IO_FILE*, i32 }
@.str = private unnamed_addr constant [11 x i8] c"fileio.txt\00",
align 1
@filename = global i8* getelementptr inbounds ([11 x i8]* @.str, i32 0, i32
0), align 8
@.str1 = private unnamed_addr constant [37 x i8] c"Test KernelGen support
for File I/O\0A\00", align 1
@.str2 = private unnamed_addr constant [21 x i8] c"Usage: %s
<szarray>\0A\00", align 1
@.str3 = private unnamed_addr constant [2 x i8] c"w\00", align 1
@stderr = external global %struct._IO_FILE*
@.str4 = private unnamed_addr constant [28 x i8] c"Cannot open output file
%s\0A\00", align 1
@.str5 = private unnamed_addr constant [4 x i8] c"%d \00", align 1
@.str6 = private unnamed_addr constant [2 x i8] c"r\00", align 1
@.str7 = private unnamed_addr constant [27 x i8] c"Cannot open input file
%s\0A\00", align 1
@.str8 = private unnamed_addr constant [3 x i8] c"%d\00", align 1
@.str9 = private unnamed_addr constant [2 x i8] c"\0A\00", align 1
define i32 @main(i32 %argc, i8** %argv) nounwind {
entry:
%retval = alloca i32, align 4
%argc.addr = alloca i32, align 4
%argv.addr = alloca i8**, align 8
%szarray = alloca i64, align 8
%wfile = alloca %struct._IO_FILE*, align 8
%i = alloca i32, align 4
%rfile = alloca %struct._IO_FILE*, align 8
%i17 = alloca i32, align 4
%val = alloca i32, align 4
store i32 0, i32* %retval
store i32 %argc, i32* %argc.addr, align 4
store i8** %argv, i8*** %argv.addr, align 8
%0 = load i32* %argc.addr, align 4
%cmp = icmp ne i32 %0, 2
br i1 %cmp, label %if.then, label %if.end
if.then: ; preds = %entry
%call = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([37 x
i8]* @.str1, i32 0, i32 0))
%1 = load i8*** %argv.addr, align 8
%arrayidx = getelementptr inbounds i8** %1, i64 0
%2 = load i8** %arrayidx, align 8
%call1 = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([21 x
i8]* @.str2, i32 0, i32 0), i8* %2)
store i32 0, i32* %retval
br label %return
if.end: ; preds = %entry
%3 = load i8*** %argv.addr, align 8
%arrayidx2 = getelementptr inbounds i8** %3, i64 1
%4 = load i8** %arrayidx2, align 8
%call3 = call i64 @strtoumax(i8* %4, i8** null, i32 0) nounwind
store i64 %call3, i64* %szarray, align 8
%5 = load i8** @filename, align 8
%call4 = call %struct._IO_FILE* @fopen(i8* %5, i8* getelementptr inbounds
([2 x i8]* @.str3, i32 0, i32 0))
store %struct._IO_FILE* %call4, %struct._IO_FILE** %wfile, align 8
%6 = load %struct._IO_FILE** %wfile, align 8
%tobool = icmp ne %struct._IO_FILE* %6, null
br i1 %tobool, label %if.end7, label %if.then5
if.then5: ; preds = %if.end
%7 = load %struct._IO_FILE** @stderr, align 8
%8 = load i8** @filename, align 8
%call6 = call i32 (%struct._IO_FILE*, i8*, ...)*
@fprintf(%struct._IO_FILE* %7, i8* getelementptr inbounds ([28 x i8]*
@.str4, i32 0, i32 0), i8* %8)
store i32 1, i32* %retval
br label %return
if.end7: ; preds = %if.end
store i32 0, i32* %i, align 4
br label %for.cond
for.cond: ; preds = %for.inc,
%if.end7
%9 = load i32* %i, align 4
%conv = sext i32 %9 to i64
%10 = load i64* %szarray, align 8
%cmp8 = icmp ult i64 %conv, %10
br i1 %cmp8, label %for.body, label %for.end
for.body: ; preds = %for.cond
%11 = load %struct._IO_FILE** %wfile, align 8
%12 = load i32* %i, align 4
%call10 = call i32 (%struct._IO_FILE*, i8*, ...)*
@fprintf(%struct._IO_FILE* %11, i8* getelementptr inbounds ([4 x i8]*
@.str5, i32 0, i32 0), i32 %12)
br label %for.inc
for.inc: ; preds = %for.body
%13 = load i32* %i, align 4
%inc = add nsw i32 %13, 1
store i32 %inc, i32* %i, align 4
br label %for.cond
for.end: ; preds = %for.cond
%14 = load %struct._IO_FILE** %wfile, align 8
%call11 = call i32 @fclose(%struct._IO_FILE* %14)
%15 = load i8** @filename, align 8
%call12 = call %struct._IO_FILE* @fopen(i8* %15, i8* getelementptr
inbounds ([2 x i8]* @.str6, i32 0, i32 0))
store %struct._IO_FILE* %call12, %struct._IO_FILE** %rfile, align 8
%16 = load %struct._IO_FILE** %rfile, align 8
%tobool13 = icmp ne %struct._IO_FILE* %16, null
br i1 %tobool13, label %if.end16, label %if.then14
if.then14: ; preds = %for.end
%17 = load %struct._IO_FILE** @stderr, align 8
%18 = load i8** @filename, align 8
%call15 = call i32 (%struct._IO_FILE*, i8*, ...)*
@fprintf(%struct._IO_FILE* %17, i8* getelementptr inbounds ([27 x i8]*
@.str7, i32 0, i32 0), i8* %18)
store i32 1, i32* %retval
br label %return
if.end16: ; preds = %for.end
store i32 0, i32* %i17, align 4
br label %for.cond18
for.cond18: ; preds = %for.inc25,
%if.end16
%19 = load i32* %i17, align 4
%conv19 = sext i32 %19 to i64
%20 = load i64* %szarray, align 8
%cmp20 = icmp ult i64 %conv19, %20
br i1 %cmp20, label %for.body22, label %for.end27
for.body22: ; preds = %for.cond18
%21 = load %struct._IO_FILE** %rfile, align 8
%call23 = call i32 (%struct._IO_FILE*, i8*, ...)*
@__isoc99_fscanf(%struct._IO_FILE* %21, i8* getelementptr inbounds ([3 x
i8]* @.str8, i32 0, i32 0), i32* %val)
%22 = load i32* %val, align 4
%call24 = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([4 x
i8]* @.str5, i32 0, i32 0), i32 %22)
br label %for.inc25
for.inc25: ; preds = %for.body22
%23 = load i32* %i17, align 4
%inc26 = add nsw i32 %23, 1
store i32 %inc26, i32* %i17, align 4
br label %for.cond18
for.end27: ; preds = %for.cond18
%call28 = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([2 x
i8]* @.str9, i32 0, i32 0))
%24 = load %struct._IO_FILE** %rfile, align 8
%call29 = call i32 @fclose(%struct._IO_FILE* %24)
store i32 0, i32* %retval
br label %return
return: ; preds = %for.end27,
%if.then14, %if.then5, %if.then
%25 = load i32* %retval
ret i32 %25
}
declare i32 @printf(i8*, ...)
declare i64 @strtoumax(i8*, i8**, i32) nounwind
declare %struct._IO_FILE* @fopen(i8*, i8*)
declare i32 @fprintf(%struct._IO_FILE*, i8*, ...)
declare i32 @fclose(%struct._IO_FILE*)
declare i32 @__isoc99_fscanf(%struct._IO_FILE*, i8*, ...)
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Anton Korobeynikov
2012-Dec-25 09:40 UTC
[LLVMdev] [DragonEgg] Strange call to @"\01__isoc99_fscanf"
> While testing a File I/O sample program, I've encountered a link failure due > to missing implementation of "\01__isoc99_fscanf" function. I think this > function should be named "__isoc99_fscanf" instead. Please see the program > code and LLVM IR generated by DragonEgg and clang below. It shows that clang > generates "__isoc99_fscanf", while DragonEgg gives "\01__isoc99_fscanf". We > generally use DragonEgg as our compiler frontend, so it is more important. > What could be the reason of "\01" issue?\01 is the magic prefix from asm("") thing in C sources. Basically this is the instruction to mangler not to change the name in any way, so, it should be emitted to assembler / binary code as "__isoc99_fscanf". How does .s / .o look like? -- With best regards, Anton Korobeynikov Faculty of Mathematics and Mechanics, Saint Petersburg State University
Dmitry Mikushin
2012-Dec-25 22:03 UTC
[LLVMdev] [DragonEgg] Strange call to @"\01__isoc99_fscanf"
Hi Anton! Thanks for the hint! You're right: it is "callq __isoc99_fscanf" in .s file. My mistake is that I'm taking a function name directly from CallInst and trying to dlsym it from the running executable. Now I'm using mangler.getNameWithPrefix method to get the actual name, and it works. Best regards, - D. 2012/12/25 Anton Korobeynikov <anton at korobeynikov.info>> > While testing a File I/O sample program, I've encountered a link failure > due > > to missing implementation of "\01__isoc99_fscanf" function. I think this > > function should be named "__isoc99_fscanf" instead. Please see the > program > > code and LLVM IR generated by DragonEgg and clang below. It shows that > clang > > generates "__isoc99_fscanf", while DragonEgg gives "\01__isoc99_fscanf". > We > > generally use DragonEgg as our compiler frontend, so it is more > important. > > What could be the reason of "\01" issue? > \01 is the magic prefix from asm("") thing in C sources. Basically > this is the instruction to mangler not to change the name in any way, > so, it should be emitted to assembler / binary code as > "__isoc99_fscanf". > > How does .s / .o look like? > > -- > With best regards, Anton Korobeynikov > Faculty of Mathematics and Mechanics, Saint Petersburg State University >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20121225/076970ab/attachment.html>
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