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compiler: Fix nil func panics, constant type conversions. 

From-SVN: r194064
This commit is contained in:
Ian Lance Taylor 2012-12-03 03:25:18 +00:00
parent 9b8a401725
commit 405c87c4d3
2 changed files with 98 additions and 63 deletions
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157
gcc/go/gofrontend/expressions.cc
View File

@ -2965,46 +2965,6 @@ Type_conversion_expression::do_lower(Gogo*, Named_object*,
{
if (!nc.set_type(type, true, location))
return Expression::make_error(location);
// Don't simply convert to or from a float or complex type
// with a different size. That may change the value.
Type* vtype = val->type();
if (vtype->is_abstract())
;
else if (type->float_type() != NULL)
{
if (vtype->float_type() != NULL)
{
if (type->float_type()->bits() != vtype->float_type()->bits())
return this;
}
else if (vtype->complex_type() != NULL)
{
if (type->float_type()->bits() * 2
!= vtype->complex_type()->bits())
return this;
}
}
else if (type->complex_type() != NULL)
{
if (vtype->complex_type() != NULL)
{
if (type->complex_type()->bits()
!= vtype->complex_type()->bits())
return this;
}
else if (vtype->float_type() != NULL)
{
if (type->complex_type()->bits()
!= vtype->float_type()->bits() * 2)
return this;
}
}
else if (vtype->float_type() != NULL)
return this;
else if (vtype->complex_type() != NULL)
return this;
return nc.expression(location);
}
}
@ -9239,6 +9199,9 @@ Call_expression::do_get_tree(Translate_context* context)
}
}
if (func == NULL)
fn = save_expr(fn);
tree ret = build_call_array(excess_type != NULL_TREE ? excess_type : rettype,
fn, nargs, args);
delete[] args;
@ -9272,6 +9235,24 @@ Call_expression::do_get_tree(Translate_context* context)
if (this->results_ != NULL)
ret = this->set_results(context, ret);
// We can't unwind the stack past a call to nil, so we need to
// insert an explicit check so that the panic can be recovered.
if (func == NULL)
{
tree compare = fold_build2_loc(location.gcc_location(), EQ_EXPR,
boolean_type_node, fn,
fold_convert_loc(location.gcc_location(),
TREE_TYPE(fn),
null_pointer_node));
tree crash = build3_loc(location.gcc_location(), COND_EXPR,
void_type_node, compare,
gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE,
location),
NULL_TREE);
ret = fold_build2_loc(location.gcc_location(), COMPOUND_EXPR,
TREE_TYPE(ret), crash, ret);
}
this->tree_ = ret;
return ret;
@ -14229,7 +14210,7 @@ Numeric_constant::check_int_type(Integer_type* type, bool issue_error,
bool
Numeric_constant::check_float_type(Float_type* type, bool issue_error,
Location location) const
Location location)
{
mpfr_t val;
switch (this->classification_)
@ -14282,6 +14263,29 @@ Numeric_constant::check_float_type(Float_type* type, bool issue_error,
}
ret = exp <= max_exp;
if (ret)
{
// Round the constant to the desired type.
mpfr_t t;
mpfr_init(t);
switch (type->bits())
{
case 32:
mpfr_set_prec(t, 24);
break;
case 64:
mpfr_set_prec(t, 53);
break;
default:
go_unreachable();
}
mpfr_set(t, val, GMP_RNDN);
mpfr_set(val, t, GMP_RNDN);
mpfr_clear(t);
this->set_float(type, val);
}
}
mpfr_clear(val);
@ -14296,7 +14300,7 @@ Numeric_constant::check_float_type(Float_type* type, bool issue_error,
bool
Numeric_constant::check_complex_type(Complex_type* type, bool issue_error,
Location location) const
Location location)
{
if (type->is_abstract())
return true;
@ -14315,46 +14319,77 @@ Numeric_constant::check_complex_type(Complex_type* type, bool issue_error,
}
mpfr_t real;
mpfr_t imag;
switch (this->classification_)
{
case NC_INT:
case NC_RUNE:
mpfr_init_set_z(real, this->u_.int_val, GMP_RNDN);
mpfr_init_set_ui(imag, 0, GMP_RNDN);
break;
case NC_FLOAT:
mpfr_init_set(real, this->u_.float_val, GMP_RNDN);
mpfr_init_set_ui(imag, 0, GMP_RNDN);
break;
case NC_COMPLEX:
if (!mpfr_nan_p(this->u_.complex_val.imag)
&& !mpfr_inf_p(this->u_.complex_val.imag)
&& !mpfr_zero_p(this->u_.complex_val.imag))
{
if (mpfr_get_exp(this->u_.complex_val.imag) > max_exp)
{
if (issue_error)
error_at(location, "complex imaginary part overflow");
return false;
}
}
mpfr_init_set(real, this->u_.complex_val.real, GMP_RNDN);
mpfr_init_set(imag, this->u_.complex_val.imag, GMP_RNDN);
break;
default:
go_unreachable();
}
bool ret;
if (mpfr_nan_p(real) || mpfr_inf_p(real) || mpfr_zero_p(real))
ret = true;
else
ret = mpfr_get_exp(real) <= max_exp;
bool ret = true;
if (!mpfr_nan_p(real)
&& !mpfr_inf_p(real)
&& !mpfr_zero_p(real)
&& mpfr_get_exp(real) > max_exp)
{
if (issue_error)
error_at(location, "complex real part overflow");
ret = false;
}
if (!mpfr_nan_p(imag)
&& !mpfr_inf_p(imag)
&& !mpfr_zero_p(imag)
&& mpfr_get_exp(imag) > max_exp)
{
if (issue_error)
error_at(location, "complex imaginary part overflow");
ret = false;
}
if (ret)
{
// Round the constant to the desired type.
mpfr_t t;
mpfr_init(t);
switch (type->bits())
{
case 64:
mpfr_set_prec(t, 24);
break;
case 128:
mpfr_set_prec(t, 53);
break;
default:
go_unreachable();
}
mpfr_set(t, real, GMP_RNDN);
mpfr_set(real, t, GMP_RNDN);
mpfr_set(t, imag, GMP_RNDN);
mpfr_set(imag, t, GMP_RNDN);
mpfr_clear(t);
this->set_complex(type, real, imag);
}
mpfr_clear(real);
if (!ret && issue_error)
error_at(location, "complex real part overflow");
mpfr_clear(imag);
return ret;
}

4
gcc/go/gofrontend/expressions.h
View File

@ -2224,10 +2224,10 @@ class Numeric_constant
check_int_type(Integer_type*, bool, Location) const;
bool
check_float_type(Float_type*, bool, Location) const;
check_float_type(Float_type*, bool, Location);
bool
check_complex_type(Complex_type*, bool, Location) const;
check_complex_type(Complex_type*, bool, Location);
// The kinds of constants.
enum Classification