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stage2: make use of proper LLVM intrinsic APIs in LLVM backend

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This commit is contained in:
Timon Kruiper 2020-12-29 22:47:52 +01:00
parent da545d6a31
commit e095ebf312
2 changed files with 19 additions and 7 deletions
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20
src/llvm_backend.zig
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@ -1,4 +1,5 @@
const std = @import("std");
const assert = std.debug.assert;
const Allocator = std.mem.Allocator;
const Compilation = @import("Compilation.zig");
const llvm = @import("llvm_bindings.zig");
@ -433,15 +434,20 @@ pub const LLVMIRModule = struct {
}
fn genBreakpoint(self: *LLVMIRModule, inst: *Inst.NoOp) !?*const llvm.ValueRef {
// TODO: Store this function somewhere such that we dont have to add it again
const fn_type = llvm.TypeRef.functionType(llvm.voidType(), null, 0, false);
const func = self.llvm_module.addFunction("llvm.debugtrap", fn_type);
// TODO: add assertion: LLVMGetIntrinsicID
_ = self.builder.buildCall(func, null, 0, "");
const llvn_fn = self.getIntrinsic("llvm.debugtrap");
_ = self.builder.buildCall(llvn_fn, null, 0, "");
return null;
}
fn getIntrinsic(self: *LLVMIRModule, name: []const u8) *const llvm.ValueRef {
const id = llvm.lookupIntrinsicID(name.ptr, name.len);
assert(id != 0);
// TODO: add support for overload intrinsics by passing the prefix of the intrinsic
// to `lookupIntrinsicID` and then passing the correct types to
// `getIntrinsicDeclaration`
return self.llvm_module.getIntrinsicDeclaration(id, null, 0);
}
fn resolveInst(self: *LLVMIRModule, inst: *ir.Inst) !*const llvm.ValueRef {
if (inst.castTag(.constant)) |const_inst| {
return self.genTypedValue(inst.src, .{ .ty = inst.ty, .val = const_inst.val });
@ -514,7 +520,7 @@ pub const LLVMIRModule = struct {
pub fn fail(self: *LLVMIRModule, src: usize, comptime format: []const u8, args: anytype) error{ OutOfMemory, CodegenFail } {
@setCold(true);
std.debug.assert(self.err_msg == null);
assert(self.err_msg == null);
self.err_msg = try Compilation.ErrorMsg.create(self.gpa, src, format, args);
return error.CodegenFail;
}

6
src/llvm_bindings.zig
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@ -63,10 +63,16 @@ pub const ModuleRef = opaque {
pub const getNamedFunction = LLVMGetNamedFunction;
extern fn LLVMGetNamedFunction(*const ModuleRef, Name: [*:0]const u8) ?*const ValueRef;
pub const getIntrinsicDeclaration = LLVMGetIntrinsicDeclaration;
extern fn LLVMGetIntrinsicDeclaration(Mod: *const ModuleRef, ID: c_uint, ParamTypes: ?[*]*const TypeRef, ParamCount: usize) *const ValueRef;
pub const printToString = LLVMPrintModuleToString;
extern fn LLVMPrintModuleToString(*const ModuleRef) [*:0]const u8;
};
pub const lookupIntrinsicID = LLVMLookupIntrinsicID;
extern fn LLVMLookupIntrinsicID(Name: [*]const u8, NameLen: usize) c_uint;
pub const disposeMessage = LLVMDisposeMessage;
extern fn LLVMDisposeMessage(Message: [*:0]const u8) void;