X86_64: silence some truncation warnings

There are a number of places where we truncate to a 32-bit value from a
64-bit value as we may running a 32-bit binary on 64-bits. This silences
some of the warnings by explicitly truncating the integers rather than
implicitly performing the operation.

Author: compnerd

Headers/DebugServer2/Architecture/X86_64/CPUState.h

@@ -238,13 +238,14 @@ struct CPUState64 {
     gp.r14 = regs[14];
     gp.r15 = regs[15];
     gp.rip = regs[16];
-    gp.eflags = regs[17];
-    gp.cs = regs[18];
-    gp.ss = regs[19];
-    gp.ds = regs[20];
-    gp.es = regs[21];
-    gp.fs = regs[22];
-    gp.gs = regs[23];
+    // Truncate the value to 32-bit as these are 32-bit registers.
+    gp.eflags = static_cast<uint32_t>(regs[17]);
+    gp.cs = static_cast<uint32_t>(regs[18]);
+    gp.ss = static_cast<uint32_t>(regs[19]);
+    gp.ds = static_cast<uint32_t>(regs[20]);
+    gp.es = static_cast<uint32_t>(regs[21]);
+    gp.fs = static_cast<uint32_t>(regs[22]);
+    gp.gs = static_cast<uint32_t>(regs[23]);
   }
 
 public:
@@ -594,7 +595,7 @@ struct CPUState {
   }
   inline void setPC(uint64_t pc) {
     if (is32)
-      state32.setPC(pc);
+      state32.setPC(static_cast<uint32_t>(pc));
     else
       state64.setPC(pc);
   }
@@ -604,7 +605,7 @@ struct CPUState {
   }
   inline void setSP(uint64_t sp) {
     if (is32)
-      state32.setSP(sp);
+      state32.setSP(static_cast<uint32_t>(sp));
     else
       state64.setSP(sp);
   }

Headers/DebugServer2/Core/HardwareBreakpointManager.h

@@ -75,7 +75,7 @@ class HardwareBreakpointManager : public BreakpointManager {
 protected:
   virtual ErrorCode disableDebugCtrlReg(uint64_t &ctrlReg, int idx);
   virtual ErrorCode enableDebugCtrlReg(uint64_t &ctrlReg, int idx, Mode mode,
-                                       int size);
+                                       size_t size);
 #endif
 
 public:

Sources/Core/X86/HardwareBreakpointManager.cpp

@@ -90,7 +90,7 @@ ErrorCode HardwareBreakpointManager::disableLocation(int idx,
 
 ErrorCode HardwareBreakpointManager::enableDebugCtrlReg(uint64_t &ctrlReg,
                                                         int idx, Mode mode,
-                                                        int size) {
+                                                        size_t size) {
   int enableIdx = idx * 2;
 #if !defined(OS_WIN32)
   enableIdx += 1;
@@ -193,7 +193,7 @@ int HardwareBreakpointManager::hit(Target::Thread *thread, Site &site) {
     if (debugRegs[kStatusRegIdx] & (1ull << i)) {
       DS2ASSERT(_locations[i] != 0);
       site = _sites.find(_locations[i])->second;
-      regIdx = i;
+      regIdx = static_cast<int>(i);
       break;
     }
   }
@@ -277,11 +277,13 @@ ErrorCode HardwareBreakpointManager::writeDebugRegisters(
     state.dr.dr[i] = (i == 4 || i == 5) ? 0 : regs[i];
   }
 #elif defined(ARCH_X86_64)
-  for (int i = 0; i < kNumDebugRegisters; ++i) {
+  for (size_t i = 0; i < kNumDebugRegisters; ++i) {
     if (state.is32) {
-      state.state32.dr.dr[i] = (i == 4 || i == 5) ? 0 : regs[i];
+      state.state32.dr.dr[i] =
+          (i == 4 || i == 5) ? 0 : static_cast<uint32_t>(regs[i]);
     } else {
-      state.state64.dr.dr[i] = (i == 4 || i == 5) ? 0 : regs[i];
+      state.state64.dr.dr[i] =
+          (i == 4 || i == 5) ? 0 : static_cast<uint32_t>(regs[i]);
     }
   }
 #else