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add #min_value() and #max_value()

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This commit is contained in:
Andrew Kelley
2016-01-05 06:30:49 -07:00
parent a11d0aaf62
commit 3327b0488d
5 changed files with 214 additions and 27 deletions
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56
src/codegen.cpp
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@@ -859,28 +859,38 @@ static LLVMValueRef gen_if_bool_expr_raw(CodeGen *g, AstNode *source_node, LLVMV
if (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");
LLVMBasicBlockRef endif_block;
bool then_endif_reachable = get_expr_type(then_node)->id != TypeTableEntryIdUnreachable;
bool else_endif_reachable = get_expr_type(else_node)->id != TypeTableEntryIdUnreachable;
if (then_endif_reachable || else_endif_reachable) {
endif_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "EndIf");
}
LLVMBuildCondBr(g->builder, cond_value, then_block, else_block);
LLVMPositionBuilderAtEnd(g->builder, then_block);
LLVMValueRef then_expr_result = gen_expr(g, then_node);
if (get_expr_type(then_node)->id != TypeTableEntryIdUnreachable)
if (then_endif_reachable) {
LLVMBuildBr(g->builder, endif_block);
}
LLVMPositionBuilderAtEnd(g->builder, else_block);
LLVMValueRef else_expr_result = gen_expr(g, else_node);
if (get_expr_type(else_node)->id != TypeTableEntryIdUnreachable)
if (else_endif_reachable) {
LLVMBuildBr(g->builder, endif_block);
}
LLVMPositionBuilderAtEnd(g->builder, endif_block);
if (use_expr_value) {
LLVMValueRef phi = LLVMBuildPhi(g->builder, LLVMTypeOf(then_expr_result), "");
LLVMValueRef incoming_values[2] = {then_expr_result, else_expr_result};
LLVMBasicBlockRef incoming_blocks[2] = {then_block, else_block};
LLVMAddIncoming(phi, incoming_values, incoming_blocks, 2);
if (then_endif_reachable || else_endif_reachable) {
LLVMPositionBuilderAtEnd(g->builder, endif_block);
if (use_expr_value) {
LLVMValueRef phi = LLVMBuildPhi(g->builder, LLVMTypeOf(then_expr_result), "");
LLVMValueRef incoming_values[2] = {then_expr_result, else_expr_result};
LLVMBasicBlockRef incoming_blocks[2] = {then_block, else_block};
LLVMAddIncoming(phi, incoming_values, incoming_blocks, 2);
return phi;
return phi;
}
}
return nullptr;
@@ -1245,14 +1255,38 @@ static LLVMValueRef gen_compiler_fn_type(CodeGen *g, AstNode *node) {
assert(node->type == NodeTypeCompilerFnType);
Buf *name = &node->data.compiler_fn_type.name;
TypeTableEntry *type_entry = get_type_for_type_node(g, node->data.compiler_fn_type.type);
if (buf_eql_str(name, "sizeof")) {
TypeTableEntry *type_entry = get_type_for_type_node(g, node->data.compiler_fn_type.type);
NumberLiteralNode *codegen_num_lit = &node->codegen_node->data.num_lit_node;
AstNodeNumberLiteral num_lit_node;
num_lit_node.kind = type_entry->data.num_lit.kind;
num_lit_node.overflow = false;
num_lit_node.data.x_uint = type_entry->size_in_bits / 8;
return gen_number_literal_raw(g, node, codegen_num_lit, &num_lit_node);
} else if (buf_eql_str(name, "min_value")) {
if (type_entry->id == TypeTableEntryIdInt) {
if (type_entry->data.integral.is_signed) {
return LLVMConstInt(type_entry->type_ref, 1ULL << (type_entry->size_in_bits - 1), false);
} else {
return LLVMConstNull(type_entry->type_ref);
}
} else if (type_entry->id == TypeTableEntryIdFloat) {
zig_panic("TODO codegen min_value float");
} else {
zig_unreachable();
}
} else if (buf_eql_str(name, "max_value")) {
if (type_entry->id == TypeTableEntryIdInt) {
if (type_entry->data.integral.is_signed) {
return LLVMConstInt(type_entry->type_ref, (1ULL << (type_entry->size_in_bits - 1)) - 1, false);
} else {
return LLVMConstAllOnes(type_entry->type_ref);
}
} else if (type_entry->id == TypeTableEntryIdFloat) {
zig_panic("TODO codegen max_value float");
} else {
zig_unreachable();
}
} else {
zig_unreachable();
}