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Fix assignment to/from volatile types 

Code like this was broken:

   char volatile vi = i;

See testcase, happens in ideosyncratic legacy code sprinkling
volatile all over.
master
Michael Matz 2016-03-26 17:57:22 +01:00
parent 8fc5a6a2a4
commit 80343ab7d8
3 changed files with 17 additions and 0 deletions
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3
i386-gen.c
View File

@ -223,6 +223,8 @@ ST_FUNC void load(int r, SValue *sv)
ft = sv->type.t;
fc = sv->c.i;
ft &= ~(VT_VOLATILE | VT_CONSTANT);
v = fr & VT_VALMASK;
if (fr & VT_LVAL) {
if (v == VT_LLOCAL) {
@ -298,6 +300,7 @@ ST_FUNC void store(int r, SValue *v)
ft = v->type.t;
fc = v->c.i;
fr = v->r & VT_VALMASK;
ft &= ~(VT_VOLATILE | VT_CONSTANT);
bt = ft & VT_BTYPE;
/* XXX: incorrect if float reg to reg */
if (bt == VT_FLOAT) {

11
tests/tcctest.c
View File

@ -119,6 +119,8 @@ int isid(int c);
void funny_line_continuation (int, ..\
. );
char via_volatile (char);
#define A 2
#define N 1234 + A
#define pf printf
@ -693,6 +695,8 @@ int main(int argc, char **argv)
callsave_test();
builtin_frame_address_test();
intdiv_test();
if (via_volatile (42) != 42)
printf ("via_volatile broken\n");
return 0;
}
@ -2848,3 +2852,10 @@ void builtin_frame_address_test(void)
bfa1(str-fp0);
#endif
}
char via_volatile (char i)
{
char volatile vi;
vi = i;
return vi;
}

3
x86_64-gen.c
View File

@ -369,6 +369,8 @@ void load(int r, SValue *sv)
ft = sv->type.t & ~VT_DEFSIGN;
fc = sv->c.i;
ft &= ~(VT_VOLATILE | VT_CONSTANT);
#ifndef TCC_TARGET_PE
/* we use indirect access via got */
if ((fr & VT_VALMASK) == VT_CONST && (fr & VT_SYM) &&
@ -532,6 +534,7 @@ void store(int r, SValue *v)
ft = v->type.t;
fc = v->c.i;
fr = v->r & VT_VALMASK;
ft &= ~(VT_VOLATILE | VT_CONSTANT);
bt = ft & VT_BTYPE;
#ifndef TCC_TARGET_PE