aarch32/config/template-assembler-aarch32.cc.in

// Copyright 2016, VIXL authors
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are met:
//
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//     this list of conditions and the following disclaimer.
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//     this list of conditions and the following disclaimer in the documentation
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//     used to endorse or promote products derived from this software without
//     specific prior written permission.
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/// This file is a template read by tools/generate_tests.py, it isn't valid C++
/// as it is. Variables written as ${substitute_me} are replaced by the script.
/// Comments starting with three forward slashes such as this one are also
/// removed.

${do_not_edit_comment}

#include "test-runner.h"

#include "test-utils.h"
#include "test-utils-aarch32.h"

#include "aarch32/assembler-aarch32.h"
#include "aarch32/macro-assembler-aarch32.h"

#define BUF_SIZE (4096)

namespace vixl {
namespace aarch32 {

// List of instruction mnemonics.
#define FOREACH_INSTRUCTION(M) \
  ${instruction_list_declaration}

// The following definitions are defined again in each generated test, therefore
// we need to place them in an anomymous namespace. It expresses that they are
// local to this file only, and the compiler is not allowed to share these types
// across test files during template instantiation. Specifically, `Operands` has
// various layouts across generated tests so it absolutely cannot be shared.

#ifdef ${isa_guard}
namespace {

// Values to be passed to the assembler to produce the instruction under test.
struct Operands {
  ${operand_list_declaration}
};

// This structure contains all data needed to test one specific
// instruction.
struct TestData {
  // The `operands` field represents what to pass to the assembler to
  // produce the instruction.
  Operands operands;
  // True if we need to generate an IT instruction for this test to be valid.
  bool in_it_block;
  // The condition to give the IT instruction, this will be set to "al" by
  // default.
  Condition it_condition;
  // Description of the operands, used for error reporting.
  const char* operands_description;
  // Unique identifier, used for generating traces.
  const char* identifier;
};

struct TestResult {
  size_t size;
  const byte* encoding;
};

// Each element of this array produce one instruction encoding.
const TestData kTests[] = {${test_case_definitions}};

// These headers each contain an array of `TestResult` with the reference output
// values. The reference arrays are names `kReference{mnemonic}`.
${include_trace_files}

// The maximum number of errors to report in detail for each test.
const unsigned kErrorReportLimit = 8;

typedef void (MacroAssembler::*Fn)(${macroassembler_method_args});

void TestHelper(Fn instruction, const char* mnemonic,
                const TestResult reference[]) {
  unsigned total_error_count = 0;
  MacroAssembler masm(BUF_SIZE);

  ${macroassembler_set_isa}

  for (unsigned i = 0; i < ARRAY_SIZE(kTests); i++) {
    // Values to pass to the macro-assembler.
    ${code_instantiate_operands}

    int32_t start = masm.GetCursorOffset();
    {
      // We never generate more that 4 bytes, as IT instructions are only
      // allowed for narrow encodings.
      ExactAssemblyScope scope(&masm, 4, ExactAssemblyScope::kMaximumSize);
      if (kTests[i].in_it_block) {
        masm.it(kTests[i].it_condition);
      }
      (masm.*instruction)(${code_parameter_list});
    }
    int32_t end = masm.GetCursorOffset();

    const byte* result_ptr =
        masm.GetBuffer()->GetOffsetAddress<const byte*>(start);
    VIXL_ASSERT(start < end);
    uint32_t result_size = end - start;

    if (Test::generate_test_trace()) {
      // Print the result bytes.
      printf("const byte kInstruction_%s_%s[] = {\n", mnemonic,
             kTests[i].identifier);
      for (uint32_t j = 0; j < result_size; j++) {
        if (j == 0) {
          printf("  0x%02" PRIx8, result_ptr[j]);
        } else {
          printf(", 0x%02" PRIx8, result_ptr[j]);
        }
      }
      // This comment is meant to be used by external tools to validate
      // the encoding. We can parse the comment to figure out what
      // instruction this corresponds to.
      if (kTests[i].in_it_block) {
        printf(" // It %s; %s %s\n};\n", kTests[i].it_condition.GetName(),
               mnemonic, kTests[i].operands_description);
      } else {
        printf(" // %s %s\n};\n", mnemonic, kTests[i].operands_description);
      }
    } else {
      // Check we've emitted the exact same encoding as present in the
      // trace file. Only print up to `kErrorReportLimit` errors.
      if (((result_size != reference[i].size) ||
           (memcmp(result_ptr,
                   reference[i].encoding,
                   reference[i].size) != 0)) &&
          (++total_error_count <= kErrorReportLimit)) {
        printf("Error when testing \"%s\" with operands \"%s\":\n", mnemonic,
               kTests[i].operands_description);
        printf("  Expected: ");
        for (uint32_t j = 0; j < reference[i].size; j++) {
          if (j == 0) {
            printf("0x%02" PRIx8, reference[i].encoding[j]);
          } else {
            printf(", 0x%02" PRIx8, reference[i].encoding[j]);
          }
        }
        printf("\n");
        printf("  Found:    ");
        for (uint32_t j = 0; j < result_size; j++) {
          if (j == 0) {
            printf("0x%02" PRIx8, result_ptr[j]);
          } else {
            printf(", 0x%02" PRIx8, result_ptr[j]);
          }
        }
        printf("\n");
      }
    }
  }

  masm.FinalizeCode();

  if (Test::generate_test_trace()) {
    // Finalize the trace file by writing the final `TestResult` array
    // which links all generated instruction encodings.
    printf("const TestResult kReference%s[] = {\n", mnemonic);
    for (unsigned i = 0; i < ARRAY_SIZE(kTests); i++) {
      printf("  {\n");
      printf("    ARRAY_SIZE(kInstruction_%s_%s),\n", mnemonic,
             kTests[i].identifier);
      printf("    kInstruction_%s_%s,\n", mnemonic, kTests[i].identifier);
      printf("  },\n");
    }
    printf("};\n");
  } else {
    if (total_error_count > kErrorReportLimit) {
      printf("%u other errors follow.\n",
             total_error_count - kErrorReportLimit);
    }
    // Crash if the test failed.
    VIXL_CHECK(total_error_count == 0);
  }
}

// Instantiate tests for each instruction in the list.
#define TEST(mnemonic)                                                      \
  void Test_##mnemonic() {                                                  \
    TestHelper(&MacroAssembler::mnemonic, #mnemonic, kReference##mnemonic); \
  }                                                                         \
  Test test_##mnemonic("AARCH32_${test_name}_" #mnemonic "_${test_isa}",    \
                       &Test_##mnemonic);
FOREACH_INSTRUCTION(TEST)
#undef TEST

}  // namespace
#endif

}  // namespace aarch32
}  // namespace vixl