diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/mesa/shader/slang/slang_codegen.c | 75 |
1 files changed, 68 insertions, 7 deletions
diff --git a/src/mesa/shader/slang/slang_codegen.c b/src/mesa/shader/slang/slang_codegen.c index 4623b6b5bcd..7b2c8b84f72 100644 --- a/src/mesa/shader/slang/slang_codegen.c +++ b/src/mesa/shader/slang/slang_codegen.c @@ -980,6 +980,8 @@ slang_substitute(slang_assemble_ctx *A, slang_operation *oper, &oper->children[0]); returnOper->type = SLANG_OPER_RETURN; /* return w/ no value */ + returnOper->locals->outer_scope = blockOper->locals; + assert(returnOper->num_children == 0); /* do substitutions on the "__retVal = expr" sub-tree */ @@ -1392,7 +1394,7 @@ slang_inline_function_call(slang_assemble_ctx * A, slang_function *fun, /** - * Insert declaration for "bool _returnFlag" in given block operation. + * Insert declaration for "bool __returnFlag" in given block operation. * This is used when we can't emit "early" return statements in subroutines. */ static void @@ -1406,12 +1408,45 @@ declare_return_flag(slang_assemble_ctx *A, slang_operation *oper) decl = slang_operation_insert_child(oper, 1); slang_generate_declaration(A, oper->locals, decl, - SLANG_SPEC_BOOL, "_returnFlag", GL_FALSE); + SLANG_SPEC_BOOL, "__returnFlag", GL_FALSE); slang_print_tree(oper, 0); } +/** + * Replace 'return' with '__returnFlag = true'. + * This is used to remove 'early returns' from functions. + */ +static void +replace_return_with_flag_set(slang_assemble_ctx *A, slang_operation *oper) +{ + slang_atom id = slang_atom_pool_atom(A->atoms, "__returnFlag"); + assert(oper->type == SLANG_OPER_RETURN); + + /* replace 'return' with __returnFlag = true' */ + slang_operation_free_children(oper); + oper->type = SLANG_OPER_ASSIGN; + slang_operation_add_children(oper, 2); + { + slang_operation *lhs = slang_oper_child(oper, 0); + lhs->type = SLANG_OPER_IDENTIFIER; + lhs->a_id = id; + } + { + slang_operation *rhs = slang_oper_child(oper, 1); + slang_operation_literal_bool(rhs, GL_TRUE); + } + + { + slang_variable *var; + var = _slang_variable_locate(oper->locals, id, GL_TRUE); + assert(var); + } + +} + + static slang_ir_node * _slang_gen_function_call(slang_assemble_ctx *A, slang_function *fun, slang_operation *oper, slang_operation *dest) @@ -1483,8 +1518,6 @@ _slang_gen_function_call(slang_assemble_ctx *A, slang_function *fun, assert(callOper->type == SLANG_OPER_BLOCK_NEW_SCOPE || callOper->type == SLANG_OPER_SEQUENCE); declare_return_flag(A, callOper); - printf("DECLARE _returnFlag\n"); - } callOper->type = SLANG_OPER_NON_INLINED_CALL; callOper->fun = fun; @@ -3871,6 +3904,8 @@ _slang_gen_return(slang_assemble_ctx * A, slang_operation *oper) const GLboolean haveReturnValue = (oper->num_children == 1 && oper->children[0].type != SLANG_OPER_VOID); + assert(oper->type == SLANG_OPER_RETURN); + /* error checking */ assert(A->CurFunction); if (haveReturnValue && @@ -3885,7 +3920,13 @@ _slang_gen_return(slang_assemble_ctx * A, slang_operation *oper) } if (!haveReturnValue) { - return new_return(A->curFuncEndLabel); + if (A->EmitContReturn) { + return new_return(A->curFuncEndLabel); + } + else { + replace_return_with_flag_set(A, oper); + return _slang_gen_operation(A, oper); + } } else { /* @@ -3926,8 +3967,28 @@ _slang_gen_return(slang_assemble_ctx * A, slang_operation *oper) slang_operation_copy(&assign->children[1], &oper->children[0]); /* assemble the new code */ - n = new_seq(_slang_gen_operation(A, assign), - new_return(A->curFuncEndLabel)); + if (A->EmitContReturn) { + n = new_seq(_slang_gen_operation(A, assign), + new_return(A->curFuncEndLabel)); + } + else { + slang_operation *setFlag = slang_operation_new(1); + setFlag->type = SLANG_OPER_ASSIGN; + setFlag->locals->outer_scope = oper->locals; + slang_operation_add_children(setFlag, 2); + { + slang_operation *lhs = slang_oper_child(setFlag, 0); + lhs->type = SLANG_OPER_IDENTIFIER; + lhs->a_id = slang_atom_pool_atom(A->atoms, "__returnFlag"); + } + { + slang_operation *rhs = slang_oper_child(setFlag, 1); + slang_operation_literal_bool(rhs, GL_TRUE); + } + n = new_seq(_slang_gen_operation(A, assign), + _slang_gen_operation(A, setFlag)); + slang_operation_delete(setFlag); + } slang_operation_delete(assign); return n; |