123 lines
3.5 KiB
C++
123 lines
3.5 KiB
C++
//===--- RISCV.cpp - RISCV Helpers for Tools --------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "RISCV.h"
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#include "clang/Driver/Driver.h"
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#include "clang/Driver/DriverDiagnostic.h"
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#include "clang/Driver/Options.h"
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#include "llvm/Option/ArgList.h"
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#include "llvm/Support/TargetParser.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace clang::driver;
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using namespace clang::driver::tools;
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using namespace clang;
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using namespace llvm::opt;
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void riscv::getRISCVTargetFeatures(const Driver &D, const ArgList &Args,
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std::vector<StringRef> &Features) {
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if (const Arg *A = Args.getLastArg(options::OPT_march_EQ)) {
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StringRef MArch = A->getValue();
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if (!(MArch.startswith("rv32") || MArch.startswith("rv64")) ||
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(MArch.size() < 5)) {
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// ISA string must begin with rv32 or rv64.
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// TODO: Improve diagnostic message.
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D.Diag(diag::err_drv_invalid_arch_name) << MArch;
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return;
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}
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// The canonical order specified in ISA manual.
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// Ref: Table 22.1 in RISC-V User-Level ISA V2.2
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StringRef StdExts = "mafdc";
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bool HasF = false, HasD = false;
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char Baseline = MArch[4];
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// TODO: Add 'e' once backend supported.
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switch (Baseline) {
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default:
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// First letter should be 'e', 'i' or 'g'.
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// TODO: Improve diagnostic message.
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D.Diag(diag::err_drv_invalid_arch_name) << MArch;
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return;
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case 'i':
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break;
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case 'g':
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// g = imafd
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StdExts = StdExts.drop_front(4);
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Features.push_back("+m");
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Features.push_back("+a");
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Features.push_back("+f");
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Features.push_back("+d");
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HasF = true;
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HasD = true;
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break;
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}
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auto StdExtsItr = StdExts.begin();
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// Skip rvxxx
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StringRef Exts = MArch.substr(5);
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for (char c : Exts) {
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// Check ISA extensions are specified in the canonical order.
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while (StdExtsItr != StdExts.end() && *StdExtsItr != c)
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++StdExtsItr;
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if (StdExtsItr == StdExts.end()) {
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// TODO: Improve diagnostic message.
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D.Diag(diag::err_drv_invalid_arch_name) << MArch;
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return;
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}
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// Move to next char to prevent repeated letter.
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++StdExtsItr;
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// The order is OK, then push it into features.
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switch (c) {
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default:
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// TODO: Improve diagnostic message.
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D.Diag(diag::err_drv_invalid_arch_name) << MArch;
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return;
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case 'm':
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Features.push_back("+m");
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break;
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case 'a':
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Features.push_back("+a");
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break;
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case 'f':
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Features.push_back("+f");
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HasF = true;
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break;
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case 'd':
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Features.push_back("+d");
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HasD = true;
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break;
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case 'c':
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Features.push_back("+c");
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break;
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}
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}
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// Dependency check
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// It's illegal to specify the 'd' (double-precision floating point)
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// extension without also specifying the 'f' (single precision
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// floating-point) extension.
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// TODO: Improve diagnostic message.
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if (HasD && !HasF)
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D.Diag(diag::err_drv_invalid_arch_name) << MArch;
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}
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}
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StringRef riscv::getRISCVABI(const ArgList &Args, const llvm::Triple &Triple) {
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if (Arg *A = Args.getLastArg(options::OPT_mabi_EQ))
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return A->getValue();
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return Triple.getArch() == llvm::Triple::riscv32 ? "ilp32" : "lp64";
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}
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