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parse if maybe expression

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This commit is contained in:
Andrew Kelley
2015-12-26 15:05:27 -07:00
parent 5943f99510
commit 1f8e3871ee
9 changed files with 176 additions and 72 deletions
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37
src/codegen.cpp
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@@ -769,18 +769,18 @@ static LLVMValueRef gen_return_expr(CodeGen *g, AstNode *node) {
}
}
static LLVMValueRef gen_if_expr(CodeGen *g, AstNode *node) {
assert(node->type == NodeTypeIfExpr);
assert(node->data.if_expr.condition);
assert(node->data.if_expr.then_block);
static LLVMValueRef gen_if_bool_expr(CodeGen *g, AstNode *node) {
assert(node->type == NodeTypeIfBoolExpr);
assert(node->data.if_bool_expr.condition);
assert(node->data.if_bool_expr.then_block);
LLVMValueRef cond_value = gen_expr(g, node->data.if_expr.condition);
LLVMValueRef cond_value = gen_expr(g, node->data.if_bool_expr.condition);
TypeTableEntry *then_type = get_expr_type(node->data.if_expr.then_block);
TypeTableEntry *then_type = get_expr_type(node->data.if_bool_expr.then_block);
bool use_expr_value = (then_type->id != TypeTableEntryIdUnreachable &&
then_type->id != TypeTableEntryIdVoid);
if (node->data.if_expr.else_node) {
if (node->data.if_bool_expr.else_node) {
LLVMBasicBlockRef then_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "Then");
LLVMBasicBlockRef else_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "Else");
LLVMBasicBlockRef endif_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "EndIf");
@@ -788,13 +788,13 @@ static LLVMValueRef gen_if_expr(CodeGen *g, AstNode *node) {
LLVMBuildCondBr(g->builder, cond_value, then_block, else_block);
LLVMPositionBuilderAtEnd(g->builder, then_block);
LLVMValueRef then_expr_result = gen_expr(g, node->data.if_expr.then_block);
if (get_expr_type(node->data.if_expr.then_block)->id != TypeTableEntryIdUnreachable)
LLVMValueRef then_expr_result = gen_expr(g, node->data.if_bool_expr.then_block);
if (get_expr_type(node->data.if_bool_expr.then_block)->id != TypeTableEntryIdUnreachable)
LLVMBuildBr(g->builder, endif_block);
LLVMPositionBuilderAtEnd(g->builder, else_block);
LLVMValueRef else_expr_result = gen_expr(g, node->data.if_expr.else_node);
if (get_expr_type(node->data.if_expr.else_node)->id != TypeTableEntryIdUnreachable)
LLVMValueRef else_expr_result = gen_expr(g, node->data.if_bool_expr.else_node);
if (get_expr_type(node->data.if_bool_expr.else_node)->id != TypeTableEntryIdUnreachable)
LLVMBuildBr(g->builder, endif_block);
LLVMPositionBuilderAtEnd(g->builder, endif_block);
@@ -818,14 +818,19 @@ static LLVMValueRef gen_if_expr(CodeGen *g, AstNode *node) {
LLVMBuildCondBr(g->builder, cond_value, then_block, endif_block);
LLVMPositionBuilderAtEnd(g->builder, then_block);
gen_expr(g, node->data.if_expr.then_block);
if (get_expr_type(node->data.if_expr.then_block)->id != TypeTableEntryIdUnreachable)
gen_expr(g, node->data.if_bool_expr.then_block);
if (get_expr_type(node->data.if_bool_expr.then_block)->id != TypeTableEntryIdUnreachable)
LLVMBuildBr(g->builder, endif_block);
LLVMPositionBuilderAtEnd(g->builder, endif_block);
return nullptr;
}
static LLVMValueRef gen_if_var_expr(CodeGen *g, AstNode *node) {
assert(node->type == NodeTypeIfVarExpr);
zig_panic("TODO gen_if_var_expr");
}
static LLVMValueRef gen_block(CodeGen *g, AstNode *block_node, TypeTableEntry *implicit_return_type) {
assert(block_node->type == NodeTypeBlock);
@@ -1112,8 +1117,10 @@ static LLVMValueRef gen_expr_no_cast(CodeGen *g, AstNode *node) {
return LLVMConstAllOnes(LLVMInt1Type());
else
return LLVMConstNull(LLVMInt1Type());
case NodeTypeIfExpr:
return gen_if_expr(g, node);
case NodeTypeIfBoolExpr:
return gen_if_bool_expr(g, node);
case NodeTypeIfVarExpr:
return gen_if_var_expr(g, node);
case NodeTypeWhileExpr:
return gen_while_expr(g, node);
case NodeTypeAsmExpr: