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/*
* Mesa 3-D graphics library
* Version: 6.3
*
* Copyright (C) 2005 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/**
* \file slang_assemble_conditional.c
* slang condtional expressions assembler
* \author Michal Krol
*/
#include "imports.h"
#include "slang_utility.h"
#include "slang_assemble_conditional.h"
#include "slang_assemble.h"
/* _slang_assemble_logicaland() */
int _slang_assemble_logicaland (slang_assembly_file *file, slang_operation *op,
slang_assembly_flow_control *flow, slang_assembly_name_space *space,
slang_assembly_local_info *info)
{
/*
and:
<left-expression>
jumpz zero
<right-expression>
jump end
zero:
push 0
end:
*/
unsigned int zero_jump, end_jump;
slang_assembly_stack_info stk;
/* evaluate left expression */
if (!_slang_assemble_operation (file, op->children, 0, flow, space, info, &stk))
return 0;
/* TODO: inspect stk */
/* jump to pushing 0 if not true */
zero_jump = file->count;
if (!slang_assembly_file_push (file, slang_asm_jump_if_zero))
return 0;
/* evaluate right expression */
if (!_slang_assemble_operation (file, op->children + 1, 0, flow, space, info, &stk))
return 0;
/* TODO: inspect stk */
/* jump to the end of the expression */
end_jump = file->count;
if (!slang_assembly_file_push (file, slang_asm_jump))
return 0;
/* push 0 on stack */
file->code[zero_jump].param[0] = file->count;
if (!slang_assembly_file_push (file, slang_asm_bool_push))
return 0;
/* the end of the expression */
file->code[end_jump].param[0] = file->count;
return 1;
}
/* _slang_assemble_logicalor() */
int _slang_assemble_logicalor (slang_assembly_file *file, slang_operation *op,
slang_assembly_flow_control *flow, slang_assembly_name_space *space,
slang_assembly_local_info *info)
{
/*
or:
<left-expression>
jumpz right
push 1
jump end
right:
<right-expression>
end:
*/
unsigned int right_jump, end_jump;
slang_assembly_stack_info stk;
/* evaluate left expression */
if (!_slang_assemble_operation (file, op->children, 0, flow, space, info, &stk))
return 0;
/* TODO: inspect stk */
/* jump to evaluation of right expression if not true */
right_jump = file->count;
if (!slang_assembly_file_push (file, slang_asm_jump_if_zero))
return 0;
/* push 1 on stack */
if (!slang_assembly_file_push_literal (file, slang_asm_bool_push, 1.0f))
return 0;
/* jump to the end of the expression */
end_jump = file->count;
if (!slang_assembly_file_push (file, slang_asm_jump))
return 0;
/* evaluate right expression */
file->code[right_jump].param[0] = file->count;
if (!_slang_assemble_operation (file, op->children + 1, 0, flow, space, info, &stk))
return 0;
/* TODO: inspect stk */
/* the end of the expression */
file->code[end_jump].param[0] = file->count;
return 1;
}
/* _slang_assemble_select() */
int _slang_assemble_select (slang_assembly_file *file, slang_operation *op,
slang_assembly_flow_control *flow, slang_assembly_name_space *space,
slang_assembly_local_info *info)
{
/*
select:
<condition-expression>
jumpz false
<true-expression>
jump end
false:
<false-expression>
end:
*/
unsigned int cond_jump, end_jump;
slang_assembly_stack_info stk;
/* execute condition expression */
if (!_slang_assemble_operation (file, op->children, 0, flow, space, info, &stk))
return 0;
/* TODO: inspect stk */
/* jump to false expression if not true */
cond_jump = file->count;
if (!slang_assembly_file_push (file, slang_asm_jump_if_zero))
return 0;
/* execute true expression */
if (!_slang_assemble_operation (file, op->children + 1, 0, flow, space, info, &stk))
return 0;
/* TODO: inspect stk */
/* jump to the end of the expression */
end_jump = file->count;
if (!slang_assembly_file_push (file, slang_asm_jump))
return 0;
/* resolve false point */
file->code[cond_jump].param[0] = file->count;
/* execute false expression */
if (!_slang_assemble_operation (file, op->children + 2, 0, flow, space, info, &stk))
return 0;
/* TODO: inspect stk */
/* resolve the end of the expression */
file->code[end_jump].param[0] = file->count;
return 1;
}
/* _slang_assemble_for() */
int _slang_assemble_for (slang_assembly_file *file, slang_operation *op,
slang_assembly_flow_control *flow, slang_assembly_name_space *space,
slang_assembly_local_info *info)
{
/*
for:
<init-statement>
jump start
break:
jump end
continue:
<loop-increment>
start:
<condition-statement>
jumpz end
<loop-body>
jump continue
end:
*/
unsigned int start_jump, end_jump, cond_jump;
unsigned int break_label, cont_label;
slang_assembly_flow_control loop_flow = *flow;
slang_assembly_stack_info stk;
/* execute initialization statement */
if (!_slang_assemble_operation (file, op->children, 0, flow, space, info, &stk))
return 0;
/* TODO: pass-in stk to cleanup */
if (!_slang_cleanup_stack (file, op->children, 0, space))
return 0;
/* skip the "go to the end of the loop" and loop-increment statements */
start_jump = file->count;
if (!slang_assembly_file_push (file, slang_asm_jump))
return 0;
/* go to the end of the loop - break statements are directed here */
break_label = file->count;
end_jump = file->count;
if (!slang_assembly_file_push (file, slang_asm_jump))
return 0;
/* resolve the beginning of the loop - continue statements are directed here */
cont_label = file->count;
/* execute loop-increment statement */
if (!_slang_assemble_operation (file, op->children + 2, 0, flow, space, info, &stk))
return 0;
/* TODO: pass-in stk to cleanup */
if (!_slang_cleanup_stack (file, op->children + 2, 0, space))
return 0;
/* resolve the condition point */
file->code[start_jump].param[0] = file->count;
/* execute condition statement */
if (!_slang_assemble_operation (file, op->children + 1, 0, flow, space, info, &stk))
return 0;
/* TODO: inspect stk */
/* jump to the end of the loop if not true */
cond_jump = file->count;
if (!slang_assembly_file_push (file, slang_asm_jump_if_zero))
return 0;
/* execute loop body */
loop_flow.loop_start = cont_label;
loop_flow.loop_end = break_label;
if (!_slang_assemble_operation (file, op->children + 3, 0, &loop_flow, space, info, &stk))
return 0;
/* TODO: pass-in stk to cleanup */
if (!_slang_cleanup_stack (file, op->children + 3, 0, space))
return 0;
/* go to the beginning of the loop */
if (!slang_assembly_file_push_label (file, slang_asm_jump, cont_label))
return 0;
/* resolve the end of the loop */
file->code[end_jump].param[0] = file->count;
file->code[cond_jump].param[0] = file->count;
return 1;
}
/* _slang_assemble_do() */
int _slang_assemble_do (slang_assembly_file *file, slang_operation *op,
slang_assembly_flow_control *flow, slang_assembly_name_space *space,
slang_assembly_local_info *info)
{
/*
do:
jump start
break:
jump end
continue:
jump condition
start:
<loop-body>
condition:
<condition-statement>
jumpz end
jump start
end:
*/
unsigned int skip_jump, end_jump, cont_jump, cond_jump;
unsigned int break_label, cont_label;
slang_assembly_flow_control loop_flow = *flow;
slang_assembly_stack_info stk;
/* skip the "go to the end of the loop" and "go to condition" statements */
skip_jump = file->count;
if (!slang_assembly_file_push (file, slang_asm_jump))
return 0;
/* go to the end of the loop - break statements are directed here */
break_label = file->count;
end_jump = file->count;
if (!slang_assembly_file_push (file, slang_asm_jump))
return 0;
/* go to condition - continue statements are directed here */
cont_label = file->count;
cont_jump = file->count;
if (!slang_assembly_file_push (file, slang_asm_jump))
return 0;
/* resolve the beginning of the loop */
file->code[skip_jump].param[0] = file->count;
/* execute loop body */
loop_flow.loop_start = cont_label;
loop_flow.loop_end = break_label;
if (!_slang_assemble_operation (file, op->children, 0, &loop_flow, space, info, &stk))
return 0;
/* TODO: pass-in stk to cleanup */
if (!_slang_cleanup_stack (file, op->children, 0, space))
return 0;
/* resolve condition point */
file->code[cont_jump].param[0] = file->count;
/* execute condition statement */
if (!_slang_assemble_operation (file, op->children + 1, 0, flow, space, info, &stk))
return 0;
/* TODO: pass-in stk to cleanup */
/* jump to the end of the loop if not true */
cond_jump = file->count;
if (!slang_assembly_file_push (file, slang_asm_jump_if_zero))
return 0;
/* jump to the beginning of the loop */
if (!slang_assembly_file_push_label (file, slang_asm_jump, file->code[skip_jump].param[0]))
return 0;
/* resolve the end of the loop */
file->code[end_jump].param[0] = file->count;
file->code[cond_jump].param[0] = file->count;
return 1;
}
/* _slang_assemble_while() */
int _slang_assemble_while (slang_assembly_file *file, slang_operation *op,
slang_assembly_flow_control *flow, slang_assembly_name_space *space,
slang_assembly_local_info *info)
{
/*
while:
jump continue
break:
jump end
continue:
<condition-statement>
jumpz end
<loop-body>
jump continue
end:
*/
unsigned int skip_jump, end_jump, cond_jump;
unsigned int break_label;
slang_assembly_flow_control loop_flow = *flow;
slang_assembly_stack_info stk;
/* skip the "go to the end of the loop" statement */
skip_jump = file->count;
if (!slang_assembly_file_push (file, slang_asm_jump))
return 0;
/* go to the end of the loop - break statements are directed here */
break_label = file->count;
end_jump = file->count;
if (!slang_assembly_file_push (file, slang_asm_jump))
return 0;
/* resolve the beginning of the loop - continue statements are directed here */
file->code[skip_jump].param[0] = file->count;
/* execute condition statement */
if (!_slang_assemble_operation (file, op->children, 0, flow, space, info, &stk))
return 0;
/* TODO: pass-in stk to cleanup */
/* jump to the end of the loop if not true */
cond_jump = file->count;
if (!slang_assembly_file_push (file, slang_asm_jump_if_zero))
return 0;
/* execute loop body */
loop_flow.loop_start = file->code[skip_jump].param[0];
loop_flow.loop_end = break_label;
if (!_slang_assemble_operation (file, op->children + 1, 0, &loop_flow, space, info, &stk))
return 0;
/* TODO: pass-in stk to cleanup */
if (!_slang_cleanup_stack (file, op->children + 1, 0, space))
return 0;
/* jump to the beginning of the loop */
if (!slang_assembly_file_push_label (file, slang_asm_jump, file->code[skip_jump].param[0]))
return 0;
/* resolve the end of the loop */
file->code[end_jump].param[0] = file->count;
file->code[cond_jump].param[0] = file->count;
return 1;
}
/* _slang_assemble_if() */
int _slang_assemble_if (slang_assembly_file *file, slang_operation *op,
slang_assembly_flow_control *flow, slang_assembly_name_space *space,
slang_assembly_local_info *info)
{
/*
if:
<condition-statement>
jumpz else
<true-statement>
jump end
else:
<false-statement>
end:
*/
unsigned int cond_jump, else_jump;
slang_assembly_stack_info stk;
/* execute condition statement */
if (!_slang_assemble_operation (file, op->children, 0, flow, space, info, &stk))
return 0;
/* TODO: pass-in stk to cleanup */
/* jump to false-statement if not true */
cond_jump = file->count;
if (!slang_assembly_file_push (file, slang_asm_jump_if_zero))
return 0;
/* execute true-statement */
if (!_slang_assemble_operation (file, op->children + 1, 0, flow, space, info, &stk))
return 0;
/* TODO: pass-in stk to cleanup */
if (!_slang_cleanup_stack (file, op->children + 1, 0, space))
return 0;
/* skip if-false statement */
else_jump = file->count;
if (!slang_assembly_file_push (file, slang_asm_jump))
return 0;
/* resolve start of false-statement */
file->code[cond_jump].param[0] = file->count;
/* execute false-statement */
if (!_slang_assemble_operation (file, op->children + 2, 0, flow, space, info, &stk))
return 0;
/* TODO: pass-in stk to cleanup */
if (!_slang_cleanup_stack (file, op->children + 2, 0, space))
return 0;
/* resolve end of if-false statement */
file->code[else_jump].param[0] = file->count;
return 1;
}
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