Is it possible to get 21 errors for a 20 line program in Any language? Any platform. ? Sorry if this should not be asked. I m new to programming. My trainer asked me this question. Can someone help or explain? Thanks in advance.
C++:
trolo = lolo; //1 line
Errors:
error C2065: 'trolo' : undeclared identifier
error C2065: 'lolo' : undeclared identifier
C#:
al; cas; r; sb; ds; es; ew; qw; 2; 32; a; int a = 2.3;
1 line, exactly 21 errors.:D
Related
So, I created my first system Verilog testbench by modifying the tutorial from https://verificationguide.com/systemverilog-examples/systemverilog-testbench-example-01/ ( In this tutorial a memory block is tested, I modified it for a simple AND gate).
There are seven files excluding the DUT file,
environment.sv
interface.sv
transactions.sv
generator.sv
testbench.sv ( topLevel testbench)
driver.sv
test.sv
I used Intel modelsim to compile these files.
While compiling, I got these errors in driver.sv and generator.sv
** Error: (vlog-13069) D:/Altera/Projects/AndGate/testbench/driver.sv(28): near ";": syntax error, unexpected ';', expecting '('.
** Error: (vlog-13069) D:/Altera/Projects/AndGate/testbench/generator.sv(4): near "trans": syntax error, unexpected IDENTIFIER, expecting ';' or ','.
Below are the corresponding files,
driver.sv
`define DRIV_IF mem_vif.DRIVER.driver_cb
class driver;
int num_trans;
virtual mem_intf mem_vif;
mailbox gen2driv;
function new(virtual mem_intf mem_vif, mailbox gen2driv);
this.mem_vif = mem_vif;
this.gen2driv = gen2driv;
endfunction
task reset();
wait(mem_vif.reset);
$display("--------- [DRIVER] Reset Started ---------");
`DRIV_IF.A <= 0;
`DRIV_IF.B <= 0;
`DRIV_IF.C <= 0;
wait(!mem_vif.reset);
$display("--------- [DRIVER] Reset Ended ---------");
endtask
task drive();
transaction trans;
gen2driv.get(trans);
$display("Num transactions : %0d", num_trans);
#(posedge mem_vif.DRIVER.clk);
`DRIV_IF.A <= trans.A;
`DRIV_IF.B <= trans.B;
trans.C = `DRIV_IF.C;
$display("\tA = %0h \tB = %0h \tC = %0h", trans.A, trans.B, `DRIV_IF.C);
num_trans++;
endtask
endclass
generator.sv
class generator;
var rand transaction trans;
mailbox gen2driv;
int repeat_count;
event ended;
function new(mailbox gen2driv, event ended);
this.gen2driv = gen2driv;
this.ended = ended;
endfunction
task main();
repeat(repeat_count) begin
trans = new();
if(!trans.randomize())$fatal("Random Generation failed");
gen2driv.put(trans);
end
-> ended;
endtask
endclass
Please, help me with this...
For future reference, it would really help to point to the line 28 and 4 in the respective files where the error is occurring as well as give the command line used to compile the code. But since I've seen this exact error before, I know it is because you put all of these files separately on your command line and not compiled together as a package.
Modelsim/Questa compiles every SystemVerilog file on the command line as a separate compilation unit. Identifiers declared in one compilation unit cannot be seen by other compilation units. When the generator and driver classes get compiled, it has no idea what transaction means and you get a syntax error. Modules and interfaces names exist in a separate namespace and the syntax where they are referenced allows them to used before their declarations have been compiled.
To remedy this, you could `include all you class files in testbench module, or the normal practice is putting them all in a package and importing the package. There is also a compilation mode where everything on the command line in one compilation unit, but that option is not scaleable as your designer get larger.
I also suggest reading these two posts I wrote:
https://blogs.sw.siemens.com/verificationhorizons/2010/07/13/package-import-versus-include/
https://blogs.sw.siemens.com/verificationhorizons/2009/05/07/programblocks/
I downloaded the memory model for the DDR3 bank that I'd be testing in simulation using Modelsim (2019.2) from Micron's website (link).
I followed the instructions from the README file to compile it but I run into syntax errors! I don't think Micron would make bug-gy code public and available to developers.
Modelsim command:
vlog +define+sg25 C:/Micro_projects/FPGA/hdl/micron/ddr3/ddr3.v
ERRORS
# ** Error: (vlog-13069) C:/Micro_projects/FPGA/hdl/micron/ddr3/ddr3.v(421): near ";": syntax error, unexpected ';', expecting '('.
# ** Error: C:/Micro_projects/FPGA/hdl/micron/ddr3/ddr3.v(424): Illegal declaration after the statement near line '421'. Declarations must precede statements. Look for stray semicolons.
# ** Error: (vlog-13069) C:/Micro_projects/FPGA/hdl/micron/ddr3/ddr3.v(433): near "integer": syntax error, unexpected integer, expecting IDENTIFIER or genvar.
# ** Error: C:/Micro_projects/FPGA/hdl/micron/ddr3/ddr3.v(433): (vlog-13205) Syntax error found in the scope following 'i'. Is there a missing '::'?
initial
begin : file_io_open
reg [BA_BITS - 1 : 0] bank;
reg [ROW_BITS - 1 : 0] row;
reg [COL_BITS - 1 : 0] col;
reg [BA_BITS + ROW_BITS + COL_BITS - 1 : 0] addr;
reg [BL_MAX * DQ_BITS - 1 : 0] data;
string _char; //LINE 421
integer in, fio_status;
if (!$value$plusargs("model_data+%s", tmp_model_dir))
begin
tmp_model_dir = "/tmp";
$display(
"%m: at time %t WARNING: no +model_data option specified, using /tmp.",
$time
);
end
for (integer i = 0; i < `BANKS; i = i + 1)
memfd[i] = open_bank_file(i);
I hope someone can suggest me how to proceed with it. I have contacted Micron but haven't heard from them yet (it has been a few days). I am stuck and any comments are appreciated!
Thank you,
Surabhi
The error is from the line which includes string, which is a SystemVerilog keyword.
You need to enable SystemVerilog syntax using the modelsim -sv option.
In VC++ 2013 (and 2015 RC), I find that this results in compilation errors:
namespace namespace1
{
template<typename T>
class Bar
{};
}
namespace namespace2
{
template <unsigned Bar>
struct Foo
{
static const int value = (Bar < 1) ? 1 : 2;
};
}
Errors:
error C2059: syntax error : ')'
: see reference to class template instantiation 'namespace2::Foo<Bar>' being compiled
error C2143: syntax error : missing ')' before ';'
error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
error C2143: syntax error : missing ';' before ')'
error C2059: syntax error : ')'
error C2238: unexpected token(s) preceding ';'
fatal error C1201: unable to continue after syntax error in class template definition
If I swap the order of the namespaces, I don't get an error.
Why is the compiler treating Bar as a type, when it's not qualified with the namespace?
Additionally, if I change the value initialisation to:
static const int value = (Bar > 1) ? 1 : 2;
I don't get an error either.
Encountered this while compiling Google Protocol Buffers, where this struct definition:
// Compile-time equivalent of VarintSize32().
template <unsigned Value>
struct StaticVarintSize32 {
static const int value =
(Value < (1 << 7))
? 1
: (Value < (1 << 14))
? 2
: (Value < (1 << 21))
? 3
: (Value < (1 << 28))
? 4
: 5;
};
won't compile due to a template class called Value existing in a namespace in our own codebase. I have worked around it for now by ensuring that the relevant Procotol Buffers header is included first, but it seems that this is a compiler bug?
Is there any other way to fix it, when I can't really change either Protocol Buffers code or the Value class?
Confirmed as a bug by Microsoft, will be fixed in 2015 RTM.
As the title says,does the visual studio distinguish these two files by their suffix?.c or .cpp?
I also have another question.At first,I stated the program like this:
int main(int argc, char **argv)
{
LARGE_INTEGER TimeStart;
LARGE_INTEGER TimeEnd;
QueryPerformanceCounter(&TimeStart);
static double Freq;
static int getfreq;
double mu,om;
double *v;
int it,i,j;
....
}
but it brings out many problems:
1>sor2d.c(23): error C2143: syntax error : missing ';' before 'type'
1>sor2d.c(24): error C2143: syntax error : missing ';' before 'type'
1>sor2d.c(25): error C2143: syntax error : missing ';' before 'type'
1>sor2d.c(26): error C2143: syntax error : missing ';' before 'type'
23 ling points to "static double Freq;"
but if I put "QueryPerformanceCounter(&TimeStart);" after the data allocation,the compiler can succeed.Could someone tell me why this happened,was is just because of my carelessness of omitting something or ignorance...?
In C, all variables must be declared before calling any methods.
Visual Studio will, by default, compile .C files as C. You can override this.
In C89, you must declare all of your variables at the top of the code block. You may also initialize them to compile-time constants (literals, macros that expand to literals, the values of variables that have already been initialized, and any operations on the above that can be performed at compile time). You cannot intersperse other types of statements (like function calls) within these declarations.
This limitation was removed in C99 (which is not supported by Visual C++) and C++.
Language: Visual C++, MFC
I'm attempting to make an array of pointers to CString variables that I have declared in my header file. In general, this is what I'm doing:
CString *variableArray[5] = {
&var1
, &var2
, &var3
, &var4
, &var5
};
For whatever reason, though, I keep getting the following error:
Error 1 error C2065: 'var1' : undeclared identifier 18
Error 2 error C2065: 'var2' : undeclared identifier 19
Error 3 error C2065: 'var3' : undeclared identifier 20
Error 4 error C2065: 'var4' : undeclared identifier 21
Error 5 error C2065: 'var5' : undeclared identifier 22
I'm not quite sure I'm getting this error. To me knowledge, this is the correct way to make an array of pointers. Any help would be awesome!
EDIT: Here are the declarations in the header file:
public:
CString var1;
CString var2;
CString var3;
CString var4;
CString var5;
Where do you create "variableArray"? If it's in a static method or outside the scope of the class, it would make sense why you're getting that error.