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Add -fpic and -fPIC options

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This commit is contained in:
Rui Ueyama 2020-09-08 18:50:40 +09:00
parent c3edffbbb0
commit 86785fceb1
4 changed files with 28 additions and 0 deletions
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1
chibicc.h
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@ -440,5 +440,6 @@ void hashmap_test(void);
bool file_exists(char *path);
extern StringArray include_paths;
extern bool opt_fpic;
extern bool opt_fcommon;
extern char *base_file;

15
codegen.c
View File

@ -73,6 +73,21 @@ static void gen_addr(Node *node) {
return;
}
if (opt_fpic) {
// Thread-local variable
if (node->var->is_tls) {
println(" data16 lea %s@tlsgd(%%rip), %%rdi", node->var->name);
println(" .value 0x6666");
println(" rex64");
println(" call __tls_get_addr@PLT");
return;
}
// Function or global variable
println(" mov %s@GOTPCREL(%%rip), %%rax", node->var->name);
return;
}
// Thread-local variable
if (node->var->is_tls) {
println(" mov %%fs:0, %%rax");

6
main.c
View File

@ -6,6 +6,7 @@ typedef enum {
StringArray include_paths;
bool opt_fcommon = true;
bool opt_fpic;
static FileType opt_x;
static StringArray opt_include;
@ -256,6 +257,11 @@ static void parse_args(int argc, char **argv) {
continue;
}
if (!strcmp(argv[i], "-fpic") || !strcmp(argv[i], "-fPIC")) {
opt_fpic = true;
continue;
}
if (!strcmp(argv[i], "-cc1-input")) {
base_file = argv[++i];
continue;

6
test/driver.sh
View File

@ -259,4 +259,10 @@ $chibicc -c -MD -MF $tmp/md-mf.d -I. $tmp/md2.c
grep -q -z '^md2.o:.*md2\.c .*/out2\.h' $tmp/md-mf.d
check -MD
echo 'extern int bar; int foo() { return bar; }' | $chibicc -fPIC -xc -c -o $tmp/foo.o -
cc -shared -o $tmp/foo.so $tmp/foo.o
echo 'int foo(); int bar=3; int main() { foo(); }' > $tmp/main.c
$chibicc -o $tmp/foo $tmp/main.c $tmp/foo.so
check -fPIC
echo OK