Add MinidumpContextWriter::CreateFromSnapshot(), everything downstream, and its test

snapshot/test/test_cpu_context.cc

+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "snapshot/test/test_cpu_context.h"
+
+#include "base/basictypes.h"
+
+namespace crashpad {
+namespace test {
+
+void InitializeCPUContextX86(CPUContext* context, uint32_t seed) {
+  context->architecture = kCPUArchitectureX86;
+
+  if (seed == 0) {
+    memset(context->x86, 0, sizeof(*context->x86));
+    return;
+  }
+
+  uint32_t value = seed;
+
+  context->x86->eax = value++;
+  context->x86->ebx = value++;
+  context->x86->ecx = value++;
+  context->x86->edx = value++;
+  context->x86->edi = value++;
+  context->x86->esi = value++;
+  context->x86->ebp = value++;
+  context->x86->esp = value++;
+  context->x86->eip = value++;
+  context->x86->eflags = value++;
+  context->x86->cs = value++;
+  context->x86->ds = value++;
+  context->x86->es = value++;
+  context->x86->fs = value++;
+  context->x86->gs = value++;
+  context->x86->ss = value++;
+  InitializeCPUContextX86Fxsave(&context->x86->fxsave, &value);
+  context->x86->dr0 = value++;
+  context->x86->dr1 = value++;
+  context->x86->dr2 = value++;
+  context->x86->dr3 = value++;
+  context->x86->dr4 = value++;
+  context->x86->dr5 = value++;
+  context->x86->dr6 = value++;
+  context->x86->dr7 = value++;
+}
+
+void InitializeCPUContextX86_64(CPUContext* context, uint32_t seed) {
+  context->architecture = kCPUArchitectureX86_64;
+
+  if (seed == 0) {
+    memset(context->x86_64, 0, sizeof(*context->x86_64));
+    return;
+  }
+
+  uint32_t value = seed;
+
+  context->x86_64->rax = value++;
+  context->x86_64->rbx = value++;
+  context->x86_64->rcx = value++;
+  context->x86_64->rdx = value++;
+  context->x86_64->rdi = value++;
+  context->x86_64->rsi = value++;
+  context->x86_64->rbp = value++;
+  context->x86_64->rsp = value++;
+  context->x86_64->r8 = value++;
+  context->x86_64->r9 = value++;
+  context->x86_64->r10 = value++;
+  context->x86_64->r11 = value++;
+  context->x86_64->r12 = value++;
+  context->x86_64->r13 = value++;
+  context->x86_64->r14 = value++;
+  context->x86_64->r15 = value++;
+  context->x86_64->rip = value++;
+  context->x86_64->rflags = value++;
+  context->x86_64->cs = value++;
+  context->x86_64->fs = value++;
+  context->x86_64->gs = value++;
+  InitializeCPUContextX86_64Fxsave(&context->x86_64->fxsave, &value);
+  context->x86_64->dr0 = value++;
+  context->x86_64->dr1 = value++;
+  context->x86_64->dr2 = value++;
+  context->x86_64->dr3 = value++;
+  context->x86_64->dr4 = value++;
+  context->x86_64->dr5 = value++;
+  context->x86_64->dr6 = value++;
+  context->x86_64->dr7 = value++;
+}
+
+namespace {
+
+// This is templatized because the CPUContextX86::Fxsave and
+// CPUContextX86_64::Fxsave are nearly identical but have different sizes for
+// the members |xmm|, |reserved_4|, and |available|.
+template <typename FxsaveType>
+void InitializeCPUContextFxsave(FxsaveType* fxsave, uint32_t* seed) {
+  uint32_t value = *seed;
+
+  fxsave->fcw = value++;
+  fxsave->fsw = value++;
+  fxsave->ftw = value++;
+  fxsave->reserved_1 = value++;
+  fxsave->fop = value++;
+  fxsave->fpu_ip = value++;
+  fxsave->fpu_cs = value++;
+  fxsave->reserved_2 = value++;
+  fxsave->fpu_dp = value++;
+  fxsave->fpu_ds = value++;
+  fxsave->reserved_3 = value++;
+  fxsave->mxcsr = value++;
+  fxsave->mxcsr_mask = value++;
+  for (size_t st_mm_index = 0;
+       st_mm_index < arraysize(fxsave->st_mm);
+       ++st_mm_index) {
+    for (size_t byte = 0;
+         byte < arraysize(fxsave->st_mm[st_mm_index].st);
+         ++byte) {
+      fxsave->st_mm[st_mm_index].st[byte] = value++;
+    }
+    for (size_t byte = 0;
+         byte < arraysize(fxsave->st_mm[st_mm_index].st_reserved);
+         ++byte) {
+      fxsave->st_mm[st_mm_index].st_reserved[byte] = value;
+    }
+  }
+  for (size_t xmm_index = 0; xmm_index < arraysize(fxsave->xmm); ++xmm_index) {
+    for (size_t byte = 0; byte < arraysize(fxsave->xmm[xmm_index]); ++byte) {
+      fxsave->xmm[xmm_index][byte] = value++;
+    }
+  }
+  for (size_t byte = 0; byte < arraysize(fxsave->reserved_4); ++byte) {
+    fxsave->reserved_4[byte] = value++;
+  }
+  for (size_t byte = 0; byte < arraysize(fxsave->available); ++byte) {
+    fxsave->available[byte] = value++;
+  }
+
+  *seed = value;
+}
+
+}  // namespace
+
+void InitializeCPUContextX86Fxsave(CPUContextX86::Fxsave* fxsave,
+                                   uint32_t* seed) {
+  return InitializeCPUContextFxsave(fxsave, seed);
+}
+
+void InitializeCPUContextX86_64Fxsave(CPUContextX86_64::Fxsave* fxsave,
+                                      uint32_t* seed) {
+  return InitializeCPUContextFxsave(fxsave, seed);
+}
+
+}  // namespace test
+}  // namespace crashpad