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Implement remaining linker script functions.

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This commit is contained in:
Ian Lance Taylor 2008-02-13 22:44:50 +00:00
parent 9579d38232
commit 3edc73f245
1 changed files with 105 additions and 25 deletions
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130
gold/expression.cc
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@ -656,7 +656,41 @@ Section_expression::value(const Expression_eval_info* eei)
return this->value_from_output_section(eei, os);
}
// Align function.
// ABSOLUTE function.
class Absolute_expression : public Unary_expression
{
public:
Absolute_expression(Expression* arg)
: Unary_expression(arg)
{ }
uint64_t
value(const Expression_eval_info* eei)
{
Output_section* dummy;
uint64_t ret = this->arg_value(eei, &dummy);
// Force the value to be absolute.
*eei->result_section_pointer = NULL;
return ret;
}
void
print(FILE* f) const
{
fprintf(f, "ABSOLUTE(");
this->arg_print(f);
fprintf(f, ")");
}
};
extern "C" Expression*
script_exp_function_absolute(Expression* arg)
{
return new Absolute_expression(arg);
}
// ALIGN function.
class Align_expression : public Binary_expression
{
@ -691,7 +725,7 @@ script_exp_function_align(Expression* left, Expression* right)
return new Align_expression(left, right);
}
// Assert function.
// ASSERT function.
class Assert_expression : public Unary_expression
{
@ -739,7 +773,7 @@ class Addr_expression : public Section_expression
protected:
uint64_t
value_from_output_section(const Expression_eval_info *eei,
value_from_output_section(const Expression_eval_info* eei,
Output_section* os)
{
*eei->result_section_pointer = os;
@ -757,6 +791,32 @@ script_exp_function_addr(const char* section_name, size_t section_name_len)
return new Addr_expression(section_name, section_name_len);
}
// ALIGNOF.
class Alignof_expression : public Section_expression
{
public:
Alignof_expression(const char* section_name, size_t section_name_len)
: Section_expression(section_name, section_name_len)
{ }
protected:
uint64_t
value_from_output_section(const Expression_eval_info*,
Output_section* os)
{ return os->addralign(); }
const char*
function_name() const
{ return "ALIGNOF"; }
};
extern "C" Expression*
script_exp_function_alignof(const char* section_name, size_t section_name_len)
{
return new Alignof_expression(section_name, section_name_len);
}
// CONSTANT. It would be nice if we could simply evaluate this
// immediately and return an Integer_expression, but unfortunately we
// don't know the target.
@ -863,6 +923,36 @@ script_exp_function_data_segment_end(Expression* val)
return val;
}
// DEFINED function.
class Defined_expression : public Expression
{
public:
Defined_expression(const char* symbol_name, size_t symbol_name_len)
: symbol_name_(symbol_name, symbol_name_len)
{ }
uint64_t
value(const Expression_eval_info* eei)
{
Symbol* sym = eei->symtab->lookup(this->symbol_name_.c_str());
return sym != NULL && sym->is_defined();
}
void
print(FILE* f) const
{ fprintf(f, "DEFINED(%s)", this->symbol_name_.c_str()); }
private:
std::string symbol_name_;
};
extern "C" Expression*
script_exp_function_defined(const char* symbol_name, size_t symbol_name_len)
{
return new Defined_expression(symbol_name, symbol_name_len);
}
// LOADADDR function
class Loadaddr_expression : public Section_expression
@ -874,7 +964,7 @@ class Loadaddr_expression : public Section_expression
protected:
uint64_t
value_from_output_section(const Expression_eval_info *eei,
value_from_output_section(const Expression_eval_info* eei,
Output_section* os)
{
if (os->has_load_address())
@ -908,7 +998,7 @@ class Sizeof_expression : public Section_expression
protected:
uint64_t
value_from_output_section(const Expression_eval_info *,
value_from_output_section(const Expression_eval_info*,
Output_section* os)
{
// We can not use data_size here, as the size of the section may
@ -972,19 +1062,21 @@ script_exp_function_sizeof_headers()
return new Sizeof_headers_expression();
}
// Functions.
// In the GNU linker SEGMENT_START basically returns the value for
// -Ttext, -Tdata, or -Tbss. We could implement this by copying the
// values from General_options to Parameters. But I doubt that
// anybody actually uses it. The point of it for the GNU linker was
// because -Ttext set the address of the .text section rather than the
// text segment. In gold -Ttext sets the text segment address anyhow.
extern "C" Expression*
script_exp_function_defined(const char*, size_t)
script_exp_function_segment_start(const char*, size_t, Expression*)
{
gold_fatal(_("DEFINED not implemented"));
gold_fatal(_("SEGMENT_START not implemented"));
}
extern "C" Expression*
script_exp_function_alignof(const char*, size_t)
{
gold_fatal(_("ALIGNOF not implemented"));
}
// Functions for memory regions. These can not be implemented unless
// and until we implement memory regions.
extern "C" Expression*
script_exp_function_origin(const char*, size_t)
@ -998,16 +1090,4 @@ script_exp_function_length(const char*, size_t)
gold_fatal(_("LENGTH not implemented"));
}
extern "C" Expression*
script_exp_function_absolute(Expression*)
{
gold_fatal(_("ABSOLUTE not implemented"));
}
extern "C" Expression*
script_exp_function_segment_start(const char*, size_t, Expression*)
{
gold_fatal(_("SEGMENT_START not implemented"));
}
} // End namespace gold.