e2dd7425bd
Add error messages for unsupported statement types
2008-08-18 15:24:38 +01:00
dea54df71b
Catch possibly NULL return value
...
This is caused by using a hierarchical reference (which can't
be translated to VHDL). The result of get_decl is NULL since
the signal has been declared in a different VHDL architecture.
Adding the assert is cleaner than having it segfault, for the
moment, until a nicer error message can be added.
2008-08-12 09:47:03 +01:00
eef1c968dc
Add message that casex cannot be translated
...
...with the correct behavior. It would be possible to
just translate it as a regular VHDL case statement (as
it was before this patch). But the behavior is not
correct as VHDL only does the equivalent of case-equality
in case statements and this can be confusing when debugging
the output. An alternative might be to emit a warning rather
than an error.
2008-08-08 20:09:40 +01:00
6f5f700cb9
Very minimal implementation of tasks
...
This expands the task in-line inside the process to avoid
problems with global variables (VHDL processes cannot
reference globals)
2008-08-07 10:54:39 +01:00
f86f454956
Apply the last patch to if/case statements too
...
This further cleans up the output by removing more
useless `wait for 0ns' statements.
2008-08-05 11:09:51 +01:00
e01e038cf9
Avoid generating useless `wait for 0ns' statements
...
If the final statement in a process is a non-blocking
assignment then there is no point adding a `wait for 0ns'
after it since it will be immediately followed by another
wait. This case is suprisingly common, so this patch helps
generate much cleaner output without breaking the cases
where the 0ns wait is actually required (e.g. to implement
non-blocking assignment properly).
2008-08-05 11:02:36 +01:00
72019959a8
Translate some ternary expressions to if statements
...
This re-implements some earlier functionality where
ternary expressions on an assignment RHS are translated
to an if statement.
2008-08-03 15:47:32 +01:00
c1b5424ca6
Implement assignment with multiple lvals
...
Multiple lvals are implemented by first assigning the complete
RHS to a temporary, and then assigning each lval in turn as
bit-selects of the temporary
2008-08-02 18:40:24 +01:00
c706c94e38
Generate a vhdl_var_ref for every assignment lval
...
This completes the refactoring of make_assignment
necessary to implement multiple lvals.
2008-08-02 18:20:18 +01:00
fad8abee34
Start refactoring make_assignment for multiple lvals
...
This patch lifts the RHS generating code out of the
lval-specific code and sticks a loop around the lvals.
2008-08-02 16:38:44 +01:00
9448c5939c
Always user Ternary_* support functions for ternary assignments
...
Previously the code generator expanded ternary assignments to
and `if' statement. This patch replaces that with a single assignment
and a call to a Ternary_* support function. This will make it
much easier to support multiple lvals later.
2008-08-02 15:46:36 +01:00
8b32096e2a
Convert std_logic to Boolean in loop tests
2008-07-27 18:39:16 +01:00
39c9c54760
Add repeat statement
2008-07-24 14:52:06 +01:00
8bee5b1108
Add `forever' statement type
2008-07-24 14:30:10 +01:00
e4c2400eb2
Refactor the expression->time code into a single function
2008-07-23 16:18:49 +01:00
7b311b6adb
Translate internal delays in assignments
2008-07-18 14:47:35 +01:00
e9637f6d11
Generate synthesisable code for sequential processes
...
Whilst adding `wait until ...' at the end of every
process is a valid translation of the input, it is not
actually synthesisable in at least one commercial
synthesiser (XST). According to the XST manual the
correct template is to use `wait until ...' at the
start of sequential processes and `wait on ...'
(equivalent to `wait until ...' with 'Event on all
the signals) at the end of combinatorial processes.
This patch implements that.
2008-07-17 17:36:42 +01:00
1f9ed2c5ec
VHDL AST element for `wait on' statement
2008-07-17 17:23:21 +01:00
2a791bfb38
Assignment to arrays
2008-07-17 13:41:44 +01:00
be67cae29f
Add translation for IVL_ST_CASEX
2008-07-16 16:42:44 +01:00
4504c2bceb
Fix initialisation order bug with `if' statements
...
If an assignment appears inside an if statement branch
it could be incorrectly used as the signal's initial
value.
2008-07-16 12:11:00 +01:00
b5e12077b2
Fix assignment to lval slice
...
It was broken in yeserday's refactoring
2008-07-15 18:40:30 +01:00
a9c98ad5f2
Handle `if' with empty cond_true part
...
Fixes assertion failure with following statement:
if (foo)
begin
end
else
...
2008-07-15 14:26:19 +01:00
b8e758edf0
Refactor LPM code
2008-07-15 14:09:24 +01:00
0b48f69b4e
Tidy up blocking assignment code
2008-07-15 10:44:48 +01:00
d1e7e325b7
Remove redundant edge_detector function
2008-07-14 21:34:48 +01:00
75b1db0add
Fix assignment with ternary RHS
...
This was also broken in the last commit
2008-07-14 21:27:21 +01:00
6e965523a1
Fix PV assignment (was broken in last commit)
2008-07-14 21:09:19 +01:00
8589c0691b
Refactor assignment code
2008-07-14 21:04:09 +01:00
99ef8ec4f1
Simplify edge detector code
...
Now generates a `wait until' statement rather than a
sensitivity list.
2008-07-14 20:29:49 +01:00
d22c9a8b05
Simplify blocking assignment
...
Now generates 'wait for 0 ns' after non-blocking assignment
2008-07-14 19:54:45 +01:00
4777966b4c
Bit select bug fixes
2008-07-07 21:19:59 +01:00
0348664512
Correctly determine VHDL type of LHS of part select
2008-07-07 16:35:39 +01:00
b0de1a8d7e
Implement part select for LHS of assignment
2008-07-07 16:11:45 +01:00
bdf5ee7ab7
Concat LPM
2008-07-07 14:48:57 +01:00
ebaa4c7d5d
Implement assignment to part select properly
...
Previously the base of the lval was ignored, this ensures
the correct assignment is generated.
2008-07-07 11:00:27 +01:00
85d2cc78d6
Finish ternary operator expansion
2008-07-06 17:56:48 +01:00
18071562ba
Partially implement ternary expressions
...
This handles the case where the expression appears as the
right hand side of an assignment. The expression is converted
into a regular if statement.
2008-07-04 21:55:51 +01:00
5aeff6d47d
Merge blocking and non-blocking assignment code
2008-07-04 20:07:38 +01:00
19871efd5a
Fix bug where sensitivity might reference undefined signals
2008-07-04 11:58:33 +01:00
409fc4dc19
Check if case expression variable is already defined
...
Verilog_Case_Ex is used as a temporary to store the result of
any non-static case expression. This fixes a bug where it would
be declared multiple times if there were multiple case statements
in a block.
2008-07-04 11:15:34 +01:00
c54b36c902
Add logical AND operator
2008-07-04 11:10:20 +01:00
19cbab78b2
Tidy up code to generate default branch of case
2008-07-03 20:04:47 +01:00
1736cd9bc8
Fix uneccessarily complicated generated case statement
...
No need to generate separate case test variable if the
test in the VL source is a simple variable reference.
2008-07-03 16:27:36 +01:00
a5264e9995
Make sure all choices are covered in case statement
2008-07-03 16:17:56 +01:00
6868127ba3
Make sure case expression has the correct type
2008-07-03 16:14:17 +01:00
dbbadbc309
Make sure the renamed signal is used in the sensitivity list
2008-07-03 16:13:02 +01:00
500442e5c5
Working function calls
2008-06-25 22:15:57 +01:00
899a70908e
Fix small bug with initialisation and ammend comments
2008-06-24 20:13:18 +01:00
bf95d77562
Finish replacing vhdl_process with vhdl_procedural
2008-06-24 20:01:06 +01:00
75631bd8f1
Move is_inital code out of vhdl_process into vhdl_scope
...
Part of tidy up before implementing functions
2008-06-24 19:06:06 +01:00
63b1887ff2
Refactor code to use the new vhdl_scope class
2008-06-24 18:52:25 +01:00
4188fbecee
Add XOR operator and catch default case branch
2008-06-24 10:55:45 +01:00
f261bf7e97
Fix bug where variables could be declared twice
2008-06-23 15:13:10 +01:00
f81129aa68
Fix some bugs with blocking assignment
2008-06-23 13:36:28 +01:00
469036990a
Output blocking assignments in the right place
2008-06-23 12:30:48 +01:00
d5cdb91d55
Handle complex expressions in case statement
2008-06-23 11:36:12 +01:00
75f7c9ae0c
Only move constant assignments into initialisation
2008-06-21 16:40:18 +01:00
5cfe7ea0aa
Tidy up output
2008-06-21 16:28:07 +01:00
ec23b70bb7
While loops
2008-06-21 15:13:44 +01:00
0caf4fd9d0
Add case statement
2008-06-21 15:03:36 +01:00
204862ac3c
Implement $write
2008-06-20 19:00:07 +01:00
404c22ac86
Improved implementation of $display
2008-06-20 11:51:13 +01:00
d7bb5658f2
Translate IVL_ST_DELAYX statements
2008-06-19 12:16:19 +01:00
e0f41198d6
Blocking assignment working correctly
2008-06-18 13:49:03 +01:00
fb31a88c51
Blocking assignment nearly working
2008-06-18 13:30:19 +01:00
254ccb9ccb
First passing at blocking assignment
2008-06-18 13:06:27 +01:00
d2bebee9d9
Refactor before adding blocking assignment
2008-06-18 12:51:11 +01:00
af8c08e6a7
Allow optional VHPI $finish implementation
2008-06-17 20:16:16 +01:00
01249000c3
Temporarily treat blocking assignment as non-blocking
2008-06-17 14:07:36 +01:00
1debbc3100
Simplify edge_detector() a bit
2008-06-16 20:06:06 +01:00
92c823680a
Fix crash when `if' statement had no `else'
2008-06-16 12:13:01 +01:00
0ea64ad8ab
Correct misleading comment
2008-06-13 14:47:06 +01:00
be3c4cf268
Generate signal initial values from `initial' processes
2008-06-13 14:10:28 +01:00
0a8fd50c4a
Find assignments that could be initializers
2008-06-13 13:59:48 +01:00
70db096b6d
Clean up the edge detector code a bit
2008-06-13 12:52:20 +01:00
005df31a0d
Use renamed signal in expressions, if there is one
2008-06-13 12:39:18 +01:00
8fe2211e2b
Generate `after' modifier instead of `wait' statements
2008-06-12 11:24:43 +01:00
46991aa65c
Generate process bodies in the right place
2008-06-12 10:47:52 +01:00
7eb41304e6
Generate rising/falling edge detectors
2008-06-12 10:36:38 +01:00
19e60b698f
Translate if statements
2008-06-11 14:20:05 +01:00
a7cfdc3a87
Add VHDL if statement to AST types
2008-06-11 14:11:37 +01:00
b010b8e3ca
Use `assert false' as initial translation of $finish
2008-06-11 13:37:21 +01:00
7560b29fb9
Find signals to map together
2008-06-10 12:21:48 +01:00
191187ed1b
Cosmetic change to avoid useless `null' statement after delay
2008-06-09 16:40:32 +01:00
2f5dcda3b6
Delay statements now translated correctly
2008-06-09 12:49:38 +01:00
d762253f74
Wait statements
2008-06-09 12:40:59 +01:00
110a1b2ac7
Replace type classes with enumeration
2008-06-08 12:48:56 +01:00
79558910d1
Catch case where NULL return wasn't detected
2008-06-07 16:44:01 +01:00
fbf85398da
Support converting bit strings to std_logic
2008-06-07 16:19:10 +01:00
1e4b96aa0a
Simplify code a bit as rval type is never needed
2008-06-07 14:57:20 +01:00
c064ae6bc3
Generate VHDL for non-blocking assignments
2008-06-07 14:54:00 +01:00
39228f3495
VHDL AST element for non-blocking assignment
2008-06-07 14:31:33 +01:00
12e2237131
Add Type'Image cast to $display parameters
2008-06-07 14:21:50 +01:00
cdb180e1d4
Associate a type with each VHDL expression node
2008-06-07 13:23:21 +01:00
8c3461f0ff
Generate sensitivity lists properly and add signal declarations
2008-06-07 11:48:38 +01:00
305f448d05
Generate code for signal references
2008-06-07 11:24:09 +01:00
5f90a3e48c
Translate sub-statement of @{..}
2008-06-06 18:22:03 +01:00
96cf190720
Generate signals and sensitivity list for @(..) statement
2008-06-06 17:56:52 +01:00
373832ba22
Specify correct sensitivity list
2008-06-06 17:36:15 +01:00
Nick Gasson