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glsl: rework loop nesting code

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This commit is contained in:
Brian Paul
2009-06-25 09:50:37 -06:00
parent dd453fa37c
commit f652f15e6d
2 changed files with 87 additions and 41 deletions
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118
src/mesa/shader/slang/slang_codegen.c
View File

@@ -440,6 +440,56 @@ _slang_output_index(const char *name, GLenum target)
}
/**
* Called when we begin code/IR generation for a new while/do/for loop.
*/
static void
push_loop(slang_assemble_ctx *A, slang_operation *loopOper, slang_ir_node *loopIR)
{
A->LoopOperStack[A->LoopDepth] = loopOper;
A->LoopIRStack[A->LoopDepth] = loopIR;
A->LoopDepth++;
}
/**
* Called when we end code/IR generation for a new while/do/for loop.
*/
static void
pop_loop(slang_assemble_ctx *A)
{
assert(A->LoopDepth > 0);
A->LoopDepth--;
}
/**
* Return pointer to slang_operation for the loop we're currently inside,
* or NULL if not in a loop.
*/
static const slang_operation *
current_loop_oper(const slang_assemble_ctx *A)
{
if (A->LoopDepth > 0)
return A->LoopOperStack[A->LoopDepth - 1];
else
return NULL;
}
/**
* Return pointer to slang_ir_node for the loop we're currently inside,
* or NULL if not in a loop.
*/
static slang_ir_node *
current_loop_ir(const slang_assemble_ctx *A)
{
if (A->LoopDepth > 0)
return A->LoopIRStack[A->LoopDepth - 1];
else
return NULL;
}
/**********************************************************************/
@@ -661,7 +711,7 @@ new_break(slang_ir_node *loopNode)
static slang_ir_node *
new_break_if_true(slang_assemble_ctx *A, slang_ir_node *cond)
{
slang_ir_node *loopNode = A->CurLoop;
slang_ir_node *loopNode = current_loop_ir(A);
slang_ir_node *n;
assert(loopNode);
assert(loopNode->Opcode == IR_LOOP);
@@ -681,7 +731,7 @@ new_break_if_true(slang_assemble_ctx *A, slang_ir_node *cond)
static slang_ir_node *
new_cont_if_true(slang_assemble_ctx *A, slang_ir_node *cond)
{
slang_ir_node *loopNode = A->CurLoop;
slang_ir_node *loopNode = current_loop_ir(A);
slang_ir_node *n;
assert(loopNode);
assert(loopNode->Opcode == IR_LOOP);
@@ -2712,8 +2762,7 @@ _slang_gen_while(slang_assemble_ctx * A, slang_operation *oper)
* BREAK if !expr (child[0])
* body code (child[1])
*/
const slang_operation *prevLoopOper;
slang_ir_node *prevLoop, *loop, *breakIf, *body;
slang_ir_node *loop, *breakIf, *body;
GLboolean isConst, constTrue;
if (!A->EmitContReturn) {
@@ -2739,13 +2788,11 @@ _slang_gen_while(slang_assemble_ctx * A, slang_operation *oper)
return new_node0(IR_NOP);
}
/* Begin new loop */
loop = new_loop(NULL);
/* save old, push new loop */
prevLoop = A->CurLoop;
A->CurLoop = loop;
prevLoopOper = A->CurLoopOper;
A->CurLoopOper = oper;
/* save loop state */
push_loop(A, oper, loop);
if (isConst && constTrue) {
/* while(nonzero constant), no conditional break */
@@ -2763,14 +2810,13 @@ _slang_gen_while(slang_assemble_ctx * A, slang_operation *oper)
/* loop->List is head of linked list of break/continue nodes */
if (!loop->List && isConst && constTrue) {
/* infinite loop detected */
A->CurLoop = prevLoop; /* clean-up */
pop_loop(A);
slang_info_log_error(A->log, "Infinite loop detected!");
return NULL;
}
/* pop loop, restore prev */
A->CurLoop = prevLoop;
A->CurLoopOper = prevLoopOper;
/* restore loop state */
pop_loop(A);
return loop;
}
@@ -2893,8 +2939,7 @@ _slang_gen_do(slang_assemble_ctx * A, slang_operation *oper)
* tail code:
* BREAK if !expr (child[1])
*/
const slang_operation *prevLoopOper;
slang_ir_node *prevLoop, *loop;
slang_ir_node *loop;
GLboolean isConst, constTrue;
if (!A->EmitContReturn) {
@@ -2914,11 +2959,8 @@ _slang_gen_do(slang_assemble_ctx * A, slang_operation *oper)
loop = new_loop(NULL);
/* save old, push new loop */
prevLoop = A->CurLoop;
A->CurLoop = loop;
prevLoopOper = A->CurLoopOper;
A->CurLoopOper = oper;
/* save loop state */
push_loop(A, oper, loop);
/* loop body: */
loop->Children[0] = _slang_gen_operation(A, &oper->children[0]);
@@ -2937,9 +2979,8 @@ _slang_gen_do(slang_assemble_ctx * A, slang_operation *oper)
/* XXX we should do infinite loop detection, as above */
/* pop loop, restore prev */
A->CurLoop = prevLoop;
A->CurLoopOper = prevLoopOper;
/* restore loop state */
pop_loop(A);
return loop;
}
@@ -3349,16 +3390,12 @@ _slang_gen_for(slang_assemble_ctx * A, slang_operation *oper)
* tail code:
* incr code (child[2]) // XXX continue here
*/
const slang_operation *prevLoopOper;
slang_ir_node *prevLoop, *loop, *cond, *breakIf, *body, *init, *incr;
slang_ir_node *loop, *cond, *breakIf, *body, *init, *incr;
init = _slang_gen_operation(A, &oper->children[0]);
loop = new_loop(NULL);
/* save old, push new loop */
prevLoop = A->CurLoop;
A->CurLoop = loop;
prevLoopOper = A->CurLoopOper;
A->CurLoopOper = oper;
/* save loop state */
push_loop(A, oper, loop);
cond = new_cond(new_not(_slang_gen_operation(A, &oper->children[1])));
breakIf = new_break_if_true(A, cond);
@@ -3368,9 +3405,8 @@ _slang_gen_for(slang_assemble_ctx * A, slang_operation *oper)
loop->Children[0] = new_seq(breakIf, body);
loop->Children[1] = incr; /* tail code */
/* pop loop, restore prev */
A->CurLoop = prevLoop;
A->CurLoopOper = prevLoopOper;
/* restore loop state */
pop_loop(A);
return new_seq(init, loop);
}
@@ -3383,7 +3419,7 @@ _slang_gen_continue(slang_assemble_ctx * A, const slang_operation *oper)
slang_ir_node *n, *cont, *incr = NULL, *loopNode;
assert(oper->type == SLANG_OPER_CONTINUE);
loopNode = A->CurLoop;
loopNode = current_loop_ir(A);
assert(loopNode);
assert(loopNode->Opcode == IR_LOOP);
@@ -3470,8 +3506,8 @@ _slang_gen_if(slang_assemble_ctx * A, const slang_operation *oper)
}
else if (is_operation_type(&oper->children[1], SLANG_OPER_CONTINUE)
&& !haveElseClause
&& A->CurLoopOper
&& A->CurLoopOper->type != SLANG_OPER_FOR) {
&& current_loop_oper(A)
&& current_loop_oper(A)->type != SLANG_OPER_FOR) {
/* Special case: generate a conditional continue */
ifBody = new_cont_if_true(A, cond);
return ifBody;
@@ -4714,13 +4750,13 @@ _slang_gen_operation(slang_assemble_ctx * A, slang_operation *oper)
case SLANG_OPER_WHILE:
return _slang_gen_while(A, oper);
case SLANG_OPER_BREAK:
if (!A->CurLoop) {
if (!current_loop_oper(A)) {
slang_info_log_error(A->log, "'break' not in loop");
return NULL;
}
return new_break(A->CurLoop);
return new_break(current_loop_ir(A));
case SLANG_OPER_CONTINUE:
if (!A->CurLoop) {
if (!current_loop_oper(A)) {
slang_info_log_error(A->log, "'continue' not in loop");
return NULL;
}
@@ -5265,8 +5301,12 @@ _slang_codegen_function(slang_assemble_ctx * A, slang_function * fun)
assert(A->program->Parameters );
assert(A->program->Varying);
assert(A->vartable);
#if 0
A->CurLoop = NULL;
A->CurLoopOper = NULL;
#else
A->LoopDepth = 0;
#endif
A->CurFunction = fun;
/* fold constant expressions, etc. */

10
src/mesa/shader/slang/slang_codegen.h
View File

@@ -31,6 +31,9 @@
#include "slang_compile.h"
#define MAX_LOOP_DEPTH 30
typedef struct slang_assemble_ctx_
{
slang_atom_pool *atoms;
@@ -40,8 +43,11 @@ typedef struct slang_assemble_ctx_
slang_var_table *vartable;
slang_info_log *log;
struct slang_label_ *curFuncEndLabel;
const slang_operation *CurLoopOper;
struct slang_ir_node_ *CurLoop;
const slang_operation *LoopOperStack[MAX_LOOP_DEPTH];
struct slang_ir_node_ *LoopIRStack[MAX_LOOP_DEPTH];
GLuint LoopDepth;
struct slang_function_ *CurFunction;
GLboolean UnresolvedRefs;
GLboolean EmitContReturn;