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analysis of result used

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This commit is contained in:
Josh Wolfe 2017-09-11 21:37:11 -07:00
parent 99cb6e955a
commit 4adffea8d0
1 changed files with 46 additions and 33 deletions
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79
src/parsec.cpp
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@ -159,6 +159,14 @@ static AstNode *trans_create_node_bin_op(Context *c, AstNode *lhs_node, BinOpTyp
return node;
}
static AstNode *maybe_suppress_result(Context *c, bool result_used, AstNode *node) {
if (result_used) return node;
return trans_create_node_bin_op(c,
trans_create_node_symbol_str(c, "_"),
BinOpTypeAssign,
node);
}
static AstNode *trans_create_node_addr_of(Context *c, bool is_const, bool is_volatile, AstNode *child_node) {
AstNode *node = trans_create_node(c, NodeTypeAddrOfExpr);
node->data.addr_of_expr.is_const = is_const;
@ -433,11 +441,11 @@ static bool c_is_float(Context *c, QualType qt) {
}
}
static AstNode *trans_stmt(Context *c, AstNode *block, Stmt *stmt);
static AstNode *trans_stmt(Context *c, bool result_used, AstNode *block, Stmt *stmt);
static AstNode *const skip_add_to_block_node = (AstNode *) 0x2;
static AstNode *trans_expr(Context *c, AstNode *block, Expr *expr) {
return trans_stmt(c, block, expr);
static AstNode *trans_expr(Context *c, bool result_used, AstNode *block, Expr *expr) {
return trans_stmt(c, result_used, block, expr);
}
static AstNode *trans_type(Context *c, const Type *ty, const SourceLocation &source_loc) {
@ -781,7 +789,7 @@ static AstNode *trans_qual_type(Context *c, QualType qt, const SourceLocation &s
static AstNode *trans_compound_stmt(Context *c, AstNode *parent, CompoundStmt *stmt) {
AstNode *child_block = trans_create_node(c, NodeTypeBlock);
for (CompoundStmt::body_iterator it = stmt->body_begin(), end_it = stmt->body_end(); it != end_it; ++it) {
AstNode *child_node = trans_stmt(c, child_block, *it);
AstNode *child_node = trans_stmt(c, false, child_block, *it);
if (child_node == nullptr)
return nullptr;
if (child_node != skip_add_to_block_node)
@ -797,7 +805,7 @@ static AstNode *trans_return_stmt(Context *c, AstNode *block, ReturnStmt *stmt)
return nullptr;
} else {
AstNode *return_node = trans_create_node(c, NodeTypeReturnExpr);
return_node->data.return_expr.expr = trans_expr(c, block, value_expr);
return_node->data.return_expr.expr = trans_expr(c, true, block, value_expr);
if (return_node->data.return_expr.expr == nullptr)
return nullptr;
return return_node;
@ -813,44 +821,44 @@ static AstNode *trans_integer_literal(Context *c, IntegerLiteral *stmt) {
return trans_create_node_apint(c, result);
}
static AstNode *trans_conditional_operator(Context *c, AstNode *block, ConditionalOperator *stmt) {
static AstNode *trans_conditional_operator(Context *c, bool result_used, AstNode *block, ConditionalOperator *stmt) {
AstNode *node = trans_create_node(c, NodeTypeIfBoolExpr);
Expr *cond_expr = stmt->getCond();
Expr *true_expr = stmt->getTrueExpr();
Expr *false_expr = stmt->getFalseExpr();
node->data.if_bool_expr.condition = trans_expr(c, block, cond_expr);
node->data.if_bool_expr.condition = trans_expr(c, true, block, cond_expr);
if (node->data.if_bool_expr.condition == nullptr)
return nullptr;
node->data.if_bool_expr.then_block = trans_expr(c, block, true_expr);
node->data.if_bool_expr.then_block = trans_expr(c, result_used, block, true_expr);
if (node->data.if_bool_expr.then_block == nullptr)
return nullptr;
node->data.if_bool_expr.else_node = trans_expr(c, block, false_expr);
node->data.if_bool_expr.else_node = trans_expr(c, result_used, block, false_expr);
if (node->data.if_bool_expr.else_node == nullptr)
return nullptr;
return node;
return maybe_suppress_result(c, result_used, node);
}
static AstNode *trans_create_bin_op(Context *c, AstNode *block, Expr *lhs, BinOpType bin_op, Expr *rhs) {
AstNode *node = trans_create_node(c, NodeTypeBinOpExpr);
node->data.bin_op_expr.bin_op = bin_op;
node->data.bin_op_expr.op1 = trans_expr(c, block, lhs);
node->data.bin_op_expr.op1 = trans_expr(c, true, block, lhs);
if (node->data.bin_op_expr.op1 == nullptr)
return nullptr;
node->data.bin_op_expr.op2 = trans_expr(c, block, rhs);
node->data.bin_op_expr.op2 = trans_expr(c, true, block, rhs);
if (node->data.bin_op_expr.op2 == nullptr)
return nullptr;
return node;
}
static AstNode *trans_binary_operator(Context *c, AstNode *block, BinaryOperator *stmt) {
static AstNode *trans_binary_operator(Context *c, bool result_used, AstNode *block, BinaryOperator *stmt) {
switch (stmt->getOpcode()) {
case BO_PtrMemD:
emit_warning(c, stmt->getLocStart(), "TODO handle more C binary operators: BO_PtrMemD");
@ -909,6 +917,7 @@ static AstNode *trans_binary_operator(Context *c, AstNode *block, BinaryOperator
emit_warning(c, stmt->getLocStart(), "TODO handle more C binary operators: BO_LOr");
return nullptr;
case BO_Assign:
(void)result_used;
emit_warning(c, stmt->getLocStart(), "TODO handle more C binary operators: BO_Assign");
return nullptr;
case BO_MulAssign:
@ -949,7 +958,7 @@ static AstNode *trans_binary_operator(Context *c, AstNode *block, BinaryOperator
zig_unreachable();
}
static AstNode *trans_compound_assign_operator(Context *c, AstNode *block, CompoundAssignOperator *stmt) {
static AstNode *trans_compound_assign_operator(Context *c, bool result_used, AstNode *block, CompoundAssignOperator *stmt) {
switch (stmt->getOpcode()) {
case BO_MulAssign:
emit_warning(c, stmt->getLocStart(), "TODO handle more C compound assign operators: BO_MulAssign");
@ -983,7 +992,7 @@ static AstNode *trans_compound_assign_operator(Context *c, AstNode *block, Compo
AstNode *child_block = trans_create_node(c, NodeTypeBlock);
// const _ref = &lhs;
AstNode *lhs = trans_expr(c, child_block, stmt->getLHS());
AstNode *lhs = trans_expr(c, true, child_block, stmt->getLHS());
if (lhs == nullptr) return nullptr;
AstNode *addr_of_lhs = trans_create_node_addr_of(c, false, false, lhs);
// TODO: avoid name collisions with generated variable names
@ -993,7 +1002,7 @@ static AstNode *trans_compound_assign_operator(Context *c, AstNode *block, Compo
// *_ref = result_type(operation_type(*_ref) >> u5(rhs));
AstNode *rhs = trans_expr(c, child_block, stmt->getRHS());
AstNode *rhs = trans_expr(c, true, child_block, stmt->getRHS());
if (rhs == nullptr) return nullptr;
const SourceLocation &rhs_location = stmt->getRHS()->getLocStart();
AstNode *rhs_type = qual_type_to_log2_int_ref(c, stmt->getComputationLHSType(), rhs_location);
@ -1015,11 +1024,13 @@ static AstNode *trans_compound_assign_operator(Context *c, AstNode *block, Compo
rhs))));
child_block->data.block.statements.append(assign_statement);
// *_ref
child_block->data.block.statements.append(
trans_create_node_prefix_op(c, PrefixOpDereference,
trans_create_node_symbol(c, tmp_var_name)));
child_block->data.block.last_statement_is_result_expression = true;
if (result_used) {
// *_ref
child_block->data.block.statements.append(
trans_create_node_prefix_op(c, PrefixOpDereference,
trans_create_node_symbol(c, tmp_var_name)));
child_block->data.block.last_statement_is_result_expression = true;
}
return child_block;
}
@ -1063,10 +1074,10 @@ static AstNode *trans_compound_assign_operator(Context *c, AstNode *block, Compo
static AstNode *trans_implicit_cast_expr(Context *c, AstNode *block, ImplicitCastExpr *stmt) {
switch (stmt->getCastKind()) {
case CK_LValueToRValue:
return trans_expr(c, block, stmt->getSubExpr());
return trans_expr(c, true, block, stmt->getSubExpr());
case CK_IntegralCast:
{
AstNode *target_node = trans_expr(c, block, stmt->getSubExpr());
AstNode *target_node = trans_expr(c, true, block, stmt->getSubExpr());
if (target_node == nullptr)
return nullptr;
return trans_c_cast(c, stmt->getExprLoc(), stmt->getType(), target_node);
@ -1279,7 +1290,7 @@ static AstNode *trans_unary_operator(Context *c, AstNode *block, UnaryOperator *
AstNode *node = trans_create_node(c, NodeTypePrefixOpExpr);
node->data.prefix_op_expr.prefix_op = PrefixOpNegation;
node->data.prefix_op_expr.primary_expr = trans_expr(c, block, op_expr);
node->data.prefix_op_expr.primary_expr = trans_expr(c, true, block, op_expr);
if (node->data.prefix_op_expr.primary_expr == nullptr)
return nullptr;
@ -1289,7 +1300,7 @@ static AstNode *trans_unary_operator(Context *c, AstNode *block, UnaryOperator *
AstNode *node = trans_create_node(c, NodeTypeBinOpExpr);
node->data.bin_op_expr.op1 = trans_create_node_unsigned(c, 0);
node->data.bin_op_expr.op2 = trans_expr(c, block, op_expr);
node->data.bin_op_expr.op2 = trans_expr(c, true, block, op_expr);
if (node->data.bin_op_expr.op2 == nullptr)
return nullptr;
@ -1331,7 +1342,7 @@ static AstNode *trans_local_declaration(Context *c, AstNode *block, DeclStmt *st
QualType qual_type = var_decl->getTypeSourceInfo()->getType();
AstNode *init_node = nullptr;
if (var_decl->hasInit()) {
init_node = trans_expr(c, block, var_decl->getInit());
init_node = trans_expr(c, true, block, var_decl->getInit());
if (init_node == nullptr)
return nullptr;
@ -1572,18 +1583,18 @@ static AstNode *trans_local_declaration(Context *c, AstNode *block, DeclStmt *st
static AstNode *trans_while_loop(Context *c, AstNode *block, WhileStmt *stmt) {
AstNode *while_node = trans_create_node(c, NodeTypeWhileExpr);
while_node->data.while_expr.condition = trans_expr(c, block, stmt->getCond());
while_node->data.while_expr.condition = trans_expr(c, true, block, stmt->getCond());
if (while_node->data.while_expr.condition == nullptr)
return nullptr;
while_node->data.while_expr.body = trans_stmt(c, block, stmt->getBody());
while_node->data.while_expr.body = trans_stmt(c, false, block, stmt->getBody());
if (while_node->data.while_expr.body == nullptr)
return nullptr;
return while_node;
}
static AstNode *trans_stmt(Context *c, AstNode *block, Stmt *stmt) {
static AstNode *trans_stmt(Context *c, bool result_used, AstNode *block, Stmt *stmt) {
Stmt::StmtClass sc = stmt->getStmtClass();
switch (sc) {
case Stmt::ReturnStmtClass:
@ -1593,11 +1604,11 @@ static AstNode *trans_stmt(Context *c, AstNode *block, Stmt *stmt) {
case Stmt::IntegerLiteralClass:
return trans_integer_literal(c, (IntegerLiteral *)stmt);
case Stmt::ConditionalOperatorClass:
return trans_conditional_operator(c, block, (ConditionalOperator *)stmt);
return trans_conditional_operator(c, result_used, block, (ConditionalOperator *)stmt);
case Stmt::BinaryOperatorClass:
return trans_binary_operator(c, block, (BinaryOperator *)stmt);
return trans_binary_operator(c, result_used, block, (BinaryOperator *)stmt);
case Stmt::CompoundAssignOperatorClass:
return trans_compound_assign_operator(c, block, (CompoundAssignOperator *)stmt);
return trans_compound_assign_operator(c, result_used, block, (CompoundAssignOperator *)stmt);
case Stmt::ImplicitCastExprClass:
return trans_implicit_cast_expr(c, block, (ImplicitCastExpr *)stmt);
case Stmt::DeclRefExprClass:
@ -1747,12 +1758,14 @@ static AstNode *trans_stmt(Context *c, AstNode *block, Stmt *stmt) {
emit_warning(c, stmt->getLocStart(), "TODO handle C CXXUuidofExprClass");
return nullptr;
case Stmt::CallExprClass:
(void)result_used;
emit_warning(c, stmt->getLocStart(), "TODO handle C CallExprClass");
return nullptr;
case Stmt::CUDAKernelCallExprClass:
emit_warning(c, stmt->getLocStart(), "TODO handle C CUDAKernelCallExprClass");
return nullptr;
case Stmt::CXXMemberCallExprClass:
(void)result_used;
emit_warning(c, stmt->getLocStart(), "TODO handle C CXXMemberCallExprClass");
return nullptr;
case Stmt::CXXOperatorCallExprClass:
@ -2219,7 +2232,7 @@ static void visit_fn_decl(Context *c, const FunctionDecl *fn_decl) {
// actual function definition with body
Stmt *body = fn_decl->getBody();
AstNode *actual_body_node = trans_stmt(c, nullptr, body);
AstNode *actual_body_node = trans_stmt(c, false, nullptr, body);
assert(actual_body_node != skip_add_to_block_node);
if (actual_body_node == nullptr) {
emit_warning(c, fn_decl->getLocation(), "unable to translate function");