Add MCContext argument to MCAsmBackend::applyFixup for error reporting

A number of backends (AArch64, MIPS, ARM) have been using
MCContext::reportError to report issues such as out-of-range fixup values in
their TgtAsmBackend. This is great, but because MCContext couldn't easily be
threaded through to the adjustFixupValue helper function from its usual
callsite (applyFixup), these backends ended up adding an MCContext* argument
and adding another call to applyFixup to processFixupValue. Adding an
MCContext parameter to applyFixup makes this unnecessary, and even better -
applyFixup can take a reference to MCContext rather than a potentially null
pointer.

Differential Revision: https://reviews.llvm.org/D30264

llvm-svn: 299529

16 files changed, 125 insertions, 170 deletions

diff --git a/llvm/lib/MC/MCAssembler.cpp b/llvm/lib/MC/MCAssembler.cpp
index 1d20ea7ca44..c2bb7b27718 100644
--- a/llvm/lib/MC/MCAssembler.cpp
+++ b/llvm/lib/MC/MCAssembler.cpp
@@ -732,8 +732,8 @@ void MCAssembler::layout(MCAsmLayout &Layout) {
         uint64_t FixedValue;
         bool IsPCRel;
         std::tie(FixedValue, IsPCRel) = handleFixup(Layout, Frag, Fixup);
-        getBackend().applyFixup(Fixup, Contents.data(),
-                                Contents.size(), FixedValue, IsPCRel);
+        getBackend().applyFixup(Fixup, Contents.data(), Contents.size(),
+                                FixedValue, IsPCRel, getContext());
       }
     }
   }
diff --git a/llvm/lib/Target/AArch64/MCTargetDesc/AArch64AsmBackend.cpp b/llvm/lib/Target/AArch64/MCTargetDesc/AArch64AsmBackend.cpp
index 14c0327f5fa..ebf05ae303d 100644
--- a/llvm/lib/Target/AArch64/MCTargetDesc/AArch64AsmBackend.cpp
+++ b/llvm/lib/Target/AArch64/MCTargetDesc/AArch64AsmBackend.cpp
@@ -73,7 +73,7 @@ public:
   }
 
   void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
-                  uint64_t Value, bool IsPCRel) const override;
+                  uint64_t Value, bool IsPCRel, MCContext &Ctx) const override;
 
   bool mayNeedRelaxation(const MCInst &Inst) const override;
   bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,
@@ -138,15 +138,15 @@ static unsigned AdrImmBits(unsigned Value) {
 }
 
 static uint64_t adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
-                                 MCContext *Ctx) {
+                                 MCContext &Ctx) {
   unsigned Kind = Fixup.getKind();
   int64_t SignedValue = static_cast<int64_t>(Value);
   switch (Kind) {
   default:
     llvm_unreachable("Unknown fixup kind!");
   case AArch64::fixup_aarch64_pcrel_adr_imm21:
-    if (Ctx && (SignedValue > 2097151 || SignedValue < -2097152))
-      Ctx->reportError(Fixup.getLoc(), "fixup value out of range");
+    if (SignedValue > 2097151 || SignedValue < -2097152)
+      Ctx.reportError(Fixup.getLoc(), "fixup value out of range");
     return AdrImmBits(Value & 0x1fffffULL);
   case AArch64::fixup_aarch64_pcrel_adrp_imm21:
     return AdrImmBits((Value & 0x1fffff000ULL) >> 12);
@@ -154,66 +154,65 @@ static uint64_t adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
   case AArch64::fixup_aarch64_pcrel_branch19:
     // Signed 21-bit immediate
     if (SignedValue > 2097151 || SignedValue < -2097152)
-      if (Ctx) Ctx->reportError(Fixup.getLoc(), "fixup value out of range");
-    if (Ctx && (Value & 0x3))
-      Ctx->reportError(Fixup.getLoc(), "fixup not sufficiently aligned");
+      Ctx.reportError(Fixup.getLoc(), "fixup value out of range");
+    if (Value & 0x3)
+      Ctx.reportError(Fixup.getLoc(), "fixup not sufficiently aligned");
     // Low two bits are not encoded.
     return (Value >> 2) & 0x7ffff;
   case AArch64::fixup_aarch64_add_imm12:
   case AArch64::fixup_aarch64_ldst_imm12_scale1:
     // Unsigned 12-bit immediate
-    if (Ctx && Value >= 0x1000)
-      Ctx->reportError(Fixup.getLoc(), "fixup value out of range");
+    if (Value >= 0x1000)
+      Ctx.reportError(Fixup.getLoc(), "fixup value out of range");
     return Value;
   case AArch64::fixup_aarch64_ldst_imm12_scale2:
     // Unsigned 12-bit immediate which gets multiplied by 2
-    if (Ctx && (Value >= 0x2000))
-      Ctx->reportError(Fixup.getLoc(), "fixup value out of range");
-    if (Ctx && (Value & 0x1))
-      Ctx->reportError(Fixup.getLoc(), "fixup must be 2-byte aligned");
+    if (Value >= 0x2000)
+      Ctx.reportError(Fixup.getLoc(), "fixup value out of range");
+    if (Value & 0x1)
+      Ctx.reportError(Fixup.getLoc(), "fixup must be 2-byte aligned");
     return Value >> 1;
   case AArch64::fixup_aarch64_ldst_imm12_scale4:
     // Unsigned 12-bit immediate which gets multiplied by 4
-    if (Ctx && (Value >= 0x4000))
-      Ctx->reportError(Fixup.getLoc(), "fixup value out of range");
-    if (Ctx && (Value & 0x3))
-      Ctx->reportError(Fixup.getLoc(), "fixup must be 4-byte aligned");
+    if (Value >= 0x4000)
+      Ctx.reportError(Fixup.getLoc(), "fixup value out of range");
+    if (Value & 0x3)
+      Ctx.reportError(Fixup.getLoc(), "fixup must be 4-byte aligned");
     return Value >> 2;
   case AArch64::fixup_aarch64_ldst_imm12_scale8:
     // Unsigned 12-bit immediate which gets multiplied by 8
-    if (Ctx && (Value >= 0x8000))
-      Ctx->reportError(Fixup.getLoc(), "fixup value out of range");
-    if (Ctx && (Value & 0x7))
-      Ctx->reportError(Fixup.getLoc(), "fixup must be 8-byte aligned");
+    if (Value >= 0x8000)
+      Ctx.reportError(Fixup.getLoc(), "fixup value out of range");
+    if (Value & 0x7)
+      Ctx.reportError(Fixup.getLoc(), "fixup must be 8-byte aligned");
     return Value >> 3;
   case AArch64::fixup_aarch64_ldst_imm12_scale16:
     // Unsigned 12-bit immediate which gets multiplied by 16
-    if (Ctx && (Value >= 0x10000))
-      Ctx->reportError(Fixup.getLoc(), "fixup value out of range");
-    if (Ctx && (Value & 0xf))
-      Ctx->reportError(Fixup.getLoc(), "fixup must be 16-byte aligned");
+    if (Value >= 0x10000)
+      Ctx.reportError(Fixup.getLoc(), "fixup value out of range");
+    if (Value & 0xf)
+      Ctx.reportError(Fixup.getLoc(), "fixup must be 16-byte aligned");
     return Value >> 4;
   case AArch64::fixup_aarch64_movw:
-    if (Ctx)
-      Ctx->reportError(Fixup.getLoc(),
-                       "no resolvable MOVZ/MOVK fixups supported yet");
+    Ctx.reportError(Fixup.getLoc(),
+                    "no resolvable MOVZ/MOVK fixups supported yet");
     return Value;
   case AArch64::fixup_aarch64_pcrel_branch14:
     // Signed 16-bit immediate
-    if (Ctx && (SignedValue > 32767 || SignedValue < -32768))
-      Ctx->reportError(Fixup.getLoc(), "fixup value out of range");
+    if (SignedValue > 32767 || SignedValue < -32768)
+      Ctx.reportError(Fixup.getLoc(), "fixup value out of range");
     // Low two bits are not encoded (4-byte alignment assumed).
-    if (Ctx && (Value & 0x3))
-      Ctx->reportError(Fixup.getLoc(), "fixup not sufficiently aligned");
+    if (Value & 0x3)
+      Ctx.reportError(Fixup.getLoc(), "fixup not sufficiently aligned");
     return (Value >> 2) & 0x3fff;
   case AArch64::fixup_aarch64_pcrel_branch26:
   case AArch64::fixup_aarch64_pcrel_call26:
     // Signed 28-bit immediate
-    if (Ctx && (SignedValue > 134217727 || SignedValue < -134217728))
-      Ctx->reportError(Fixup.getLoc(), "fixup value out of range");
+    if (SignedValue > 134217727 || SignedValue < -134217728)
+      Ctx.reportError(Fixup.getLoc(), "fixup value out of range");
     // Low two bits are not encoded (4-byte alignment assumed).
-    if (Ctx && (Value & 0x3))
-      Ctx->reportError(Fixup.getLoc(), "fixup not sufficiently aligned");
+    if (Value & 0x3)
+      Ctx.reportError(Fixup.getLoc(), "fixup not sufficiently aligned");
     return (Value >> 2) & 0x3ffffff;
   case FK_Data_1:
   case FK_Data_2:
@@ -264,13 +263,13 @@ unsigned AArch64AsmBackend::getFixupKindContainereSizeInBytes(unsigned Kind) con
 
 void AArch64AsmBackend::applyFixup(const MCFixup &Fixup, char *Data,
                                    unsigned DataSize, uint64_t Value,
-                                   bool IsPCRel) const {
+                                   bool IsPCRel, MCContext &Ctx) const {
   unsigned NumBytes = getFixupKindNumBytes(Fixup.getKind());
   if (!Value)
     return; // Doesn't change encoding.
   MCFixupKindInfo Info = getFixupKindInfo(Fixup.getKind());
   // Apply any target-specific value adjustments.
-  Value = adjustFixupValue(Fixup, Value, nullptr);
+  Value = adjustFixupValue(Fixup, Value, Ctx);
 
   // Shift the value into position.
   Value <<= Info.TargetOffset;
@@ -521,17 +520,6 @@ public:
 
     return CompactUnwindEncoding;
   }
-
-  void processFixupValue(const MCAssembler &Asm, const MCAsmLayout &Layout,
-                         const MCFixup &Fixup, const MCFragment *DF,
-                         const MCValue &Target, uint64_t &Value,
-                         bool &IsResolved) override {
-    // Try to get the encoded value for the fixup as-if we're mapping it into
-    // the instruction. This allows adjustFixupValue() to issue a diagnostic
-    // if the value is invalid.
-    if (IsResolved)
-      (void)adjustFixupValue(Fixup, Value, &Asm.getContext());
-  }
 };
 
 } // end anonymous namespace
@@ -575,12 +563,6 @@ void ELFAArch64AsmBackend::processFixupValue(
   // to the linker -- a relocation!
   if ((uint32_t)Fixup.getKind() == AArch64::fixup_aarch64_pcrel_adrp_imm21)
     IsResolved = false;
-
-  // Try to get the encoded value for the fixup as-if we're mapping it into
-  // the instruction. This allows adjustFixupValue() to issue a diagnostic
-  // if the value is invalid.
-  if (IsResolved)
-    (void)adjustFixupValue(Fixup, Value, &Asm.getContext());
 }
 
 }
diff --git a/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUAsmBackend.cpp b/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUAsmBackend.cpp
index ffb92aae599..5a7790fb9f5 100644
--- a/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUAsmBackend.cpp
+++ b/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUAsmBackend.cpp
@@ -37,7 +37,7 @@ public:
                          bool &IsResolved) override;
 
   void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
-                  uint64_t Value, bool IsPCRel) const override;
+                  uint64_t Value, bool IsPCRel, MCContext &Ctx) const override;
   bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,
                             const MCRelaxableFragment *DF,
                             const MCAsmLayout &Layout) const override {
@@ -131,7 +131,7 @@ void AMDGPUAsmBackend::processFixupValue(const MCAssembler &Asm,
 
 void AMDGPUAsmBackend::applyFixup(const MCFixup &Fixup, char *Data,
                                   unsigned DataSize, uint64_t Value,
-                                  bool IsPCRel) const {
+                                  bool IsPCRel, MCContext &Ctx) const {
   if (!Value)
     return; // Doesn't change encoding.
 
diff --git a/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp b/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
index 4b0f0ce88e8..40bf545e832 100644
--- a/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
+++ b/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
@@ -357,13 +357,13 @@ static uint32_t joinHalfWords(uint32_t FirstHalf, uint32_t SecondHalf,
 }
 
 unsigned ARMAsmBackend::adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
-                                         bool IsPCRel, MCContext *Ctx,
+                                         bool IsPCRel, MCContext &Ctx,
                                          bool IsLittleEndian,
                                          bool IsResolved) const {
   unsigned Kind = Fixup.getKind();
   switch (Kind) {
   default:
-    if (Ctx) Ctx->reportError(Fixup.getLoc(), "bad relocation fixup type");
+    Ctx.reportError(Fixup.getLoc(), "bad relocation fixup type");
     return 0;
   case FK_Data_1:
   case FK_Data_2:
@@ -413,8 +413,8 @@ unsigned ARMAsmBackend::adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
       Value = -Value;
       isAdd = false;
     }
-    if (Ctx && Value >= 4096) {
-      Ctx->reportError(Fixup.getLoc(), "out of range pc-relative fixup value");
+    if (Value >= 4096) {
+      Ctx.reportError(Fixup.getLoc(), "out of range pc-relative fixup value");
       return 0;
     }
     Value |= isAdd << 23;
@@ -434,8 +434,8 @@ unsigned ARMAsmBackend::adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
       Value = -Value;
       opc = 2; // 0b0010
     }
-    if (Ctx && ARM_AM::getSOImmVal(Value) == -1) {
-      Ctx->reportError(Fixup.getLoc(), "out of range pc-relative fixup value");
+    if (ARM_AM::getSOImmVal(Value) == -1) {
+      Ctx.reportError(Fixup.getLoc(), "out of range pc-relative fixup value");
       return 0;
     }
     // Encode the immediate and shift the opcode into place.
@@ -542,8 +542,8 @@ unsigned ARMAsmBackend::adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
     //
     // Note that the halfwords are stored high first, low second; so we need
     // to transpose the fixup value here to map properly.
-    if (Ctx && Value % 4 != 0) {
-      Ctx->reportError(Fixup.getLoc(), "misaligned ARM call destination");
+    if (Value % 4 != 0) {
+      Ctx.reportError(Fixup.getLoc(), "misaligned ARM call destination");
       return 0;
     }
 
@@ -569,10 +569,10 @@ unsigned ARMAsmBackend::adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
   case ARM::fixup_arm_thumb_cp:
     // On CPUs supporting Thumb2, this will be relaxed to an ldr.w, otherwise we
     // could have an error on our hands.
-    if (Ctx && !STI->getFeatureBits()[ARM::FeatureThumb2] && IsResolved) {
+    if (!STI->getFeatureBits()[ARM::FeatureThumb2] && IsResolved) {
       const char *FixupDiagnostic = reasonForFixupRelaxation(Fixup, Value);
       if (FixupDiagnostic) {
-        Ctx->reportError(Fixup.getLoc(), FixupDiagnostic);
+        Ctx.reportError(Fixup.getLoc(), FixupDiagnostic);
         return 0;
       }
     }
@@ -582,8 +582,8 @@ unsigned ARMAsmBackend::adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
     // CB instructions can only branch to offsets in [4, 126] in multiples of 2
     // so ensure that the raw value LSB is zero and it lies in [2, 130].
     // An offset of 2 will be relaxed to a NOP.
-    if (Ctx && ((int64_t)Value < 2 || Value > 0x82 || Value & 1)) {
-      Ctx->reportError(Fixup.getLoc(), "out of range pc-relative fixup value");
+    if ((int64_t)Value < 2 || Value > 0x82 || Value & 1) {
+      Ctx.reportError(Fixup.getLoc(), "out of range pc-relative fixup value");
       return 0;
     }
     // Offset by 4 and don't encode the lower bit, which is always 0.
@@ -593,21 +593,21 @@ unsigned ARMAsmBackend::adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
   }
   case ARM::fixup_arm_thumb_br:
     // Offset by 4 and don't encode the lower bit, which is always 0.
-    if (Ctx && !STI->getFeatureBits()[ARM::FeatureThumb2] &&
-               !STI->getFeatureBits()[ARM::HasV8MBaselineOps]) {
+    if (!STI->getFeatureBits()[ARM::FeatureThumb2] &&
+        !STI->getFeatureBits()[ARM::HasV8MBaselineOps]) {
       const char *FixupDiagnostic = reasonForFixupRelaxation(Fixup, Value);
       if (FixupDiagnostic) {
-        Ctx->reportError(Fixup.getLoc(), FixupDiagnostic);
+        Ctx.reportError(Fixup.getLoc(), FixupDiagnostic);
         return 0;
       }
     }
     return ((Value - 4) >> 1) & 0x7ff;
   case ARM::fixup_arm_thumb_bcc:
     // Offset by 4 and don't encode the lower bit, which is always 0.
-    if (Ctx && !STI->getFeatureBits()[ARM::FeatureThumb2]) {
+    if (!STI->getFeatureBits()[ARM::FeatureThumb2]) {
       const char *FixupDiagnostic = reasonForFixupRelaxation(Fixup, Value);
       if (FixupDiagnostic) {
-        Ctx->reportError(Fixup.getLoc(), FixupDiagnostic);
+        Ctx.reportError(Fixup.getLoc(), FixupDiagnostic);
         return 0;
       }
     }
@@ -621,8 +621,8 @@ unsigned ARMAsmBackend::adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
       isAdd = false;
     }
     // The value has the low 4 bits encoded in [3:0] and the high 4 in [11:8].
-    if (Ctx && Value >= 256) {
-      Ctx->reportError(Fixup.getLoc(), "out of range pc-relative fixup value");
+    if (Value >= 256) {
+      Ctx.reportError(Fixup.getLoc(), "out of range pc-relative fixup value");
       return 0;
     }
     Value = (Value & 0xf) | ((Value & 0xf0) << 4);
@@ -642,8 +642,8 @@ unsigned ARMAsmBackend::adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
     }
     // These values don't encode the low two bits since they're always zero.
     Value >>= 2;
-    if (Ctx && Value >= 256) {
-      Ctx->reportError(Fixup.getLoc(), "out of range pc-relative fixup value");
+    if (Value >= 256) {
+      Ctx.reportError(Fixup.getLoc(), "out of range pc-relative fixup value");
       return 0;
     }
     Value |= isAdd << 23;
@@ -668,13 +668,13 @@ unsigned ARMAsmBackend::adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
       isAdd = false;
     }
     // These values don't encode the low bit since it's always zero.
-    if (Ctx && (Value & 1)) {
-      Ctx->reportError(Fixup.getLoc(), "invalid value for this fixup");
+    if (Value & 1) {
+      Ctx.reportError(Fixup.getLoc(), "invalid value for this fixup");
       return 0;
     }
     Value >>= 1;
-    if (Ctx && Value >= 256) {
-      Ctx->reportError(Fixup.getLoc(), "out of range pc-relative fixup value");
+    if (Value >= 256) {
+      Ctx.reportError(Fixup.getLoc(), "out of range pc-relative fixup value");
       return 0;
     }
     Value |= isAdd << 23;
@@ -688,8 +688,8 @@ unsigned ARMAsmBackend::adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
   }
   case ARM::fixup_arm_mod_imm:
     Value = ARM_AM::getSOImmVal(Value);
-    if (Ctx && Value >> 12) {
-      Ctx->reportError(Fixup.getLoc(), "out of range immediate fixup value");
+    if (Value >> 12) {
+      Ctx.reportError(Fixup.getLoc(), "out of range immediate fixup value");
       return 0;
     }
     return Value;
@@ -738,12 +738,6 @@ void ARMAsmBackend::processFixupValue(const MCAssembler &Asm,
             (unsigned)Fixup.getKind() == ARM::fixup_arm_uncondbl ||
             (unsigned)Fixup.getKind() == ARM::fixup_arm_condbl))
     IsResolved = false;
-
-  // Try to get the encoded value for the fixup as-if we're mapping it into
-  // the instruction. This allows adjustFixupValue() to issue a diagnostic
-  // if the value is invalid.
-  (void)adjustFixupValue(Fixup, Value, false, &Asm.getContext(),
-                         IsLittleEndian, IsResolved);
 }
 
 /// getFixupKindNumBytes - The number of bytes the fixup may change.
@@ -847,11 +841,10 @@ static unsigned getFixupKindContainerSizeBytes(unsigned Kind) {
 }
 
 void ARMAsmBackend::applyFixup(const MCFixup &Fixup, char *Data,
-                               unsigned DataSize, uint64_t Value,
-                               bool IsPCRel) const {
+                               unsigned DataSize, uint64_t Value, bool IsPCRel,
+                               MCContext &Ctx) const {
   unsigned NumBytes = getFixupKindNumBytes(Fixup.getKind());
-  Value =
-      adjustFixupValue(Fixup, Value, IsPCRel, nullptr, IsLittleEndian, true);
+  Value = adjustFixupValue(Fixup, Value, IsPCRel, Ctx, IsLittleEndian, true);
   if (!Value)
     return; // Doesn't change encoding.
 
diff --git a/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.h b/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.h
index 84caaacc47d..2ddedb5d610 100644
--- a/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.h
+++ b/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.h
@@ -46,11 +46,11 @@ public:
                          bool &IsResolved) override;
 
   unsigned adjustFixupValue(const MCFixup &Fixup, uint64_t Value, bool IsPCRel,
-                            MCContext *Ctx, bool IsLittleEndian,
+                            MCContext &Ctx, bool IsLittleEndian,
                             bool IsResolved) const;
 
   void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
-                  uint64_t Value, bool IsPCRel) const override;
+                  uint64_t Value, bool IsPCRel, MCContext &Ctx) const override;
 
   unsigned getRelaxedOpcode(unsigned Op) const;
 
diff --git a/llvm/lib/Target/ARM/MCTargetDesc/ARMELFObjectWriter.cpp b/llvm/lib/Target/ARM/MCTargetDesc/ARMELFObjectWriter.cpp
index c921e4cf782..e1fa2457182 100644
--- a/llvm/lib/Target/ARM/MCTargetDesc/ARMELFObjectWriter.cpp
+++ b/llvm/lib/Target/ARM/MCTargetDesc/ARMELFObjectWriter.cpp
@@ -9,6 +9,7 @@
 
 #include "MCTargetDesc/ARMFixupKinds.h"
 #include "MCTargetDesc/ARMMCTargetDesc.h"
+#include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCELFObjectWriter.h"
 #include "llvm/MC/MCExpr.h"
 #include "llvm/MC/MCFixup.h"
@@ -25,9 +26,8 @@ namespace {
   class ARMELFObjectWriter : public MCELFObjectTargetWriter {
     enum { DefaultEABIVersion = 0x05000000U };
 
-    unsigned GetRelocTypeInner(const MCValue &Target,
-                               const MCFixup &Fixup,
-                               bool IsPCRel) const;
+    unsigned GetRelocTypeInner(const MCValue &Target, const MCFixup &Fixup,
+                               bool IsPCRel, MCContext &Ctx) const;
 
   public:
     ARMELFObjectWriter(uint8_t OSABI);
@@ -69,19 +69,20 @@ bool ARMELFObjectWriter::needsRelocateWithSymbol(const MCSymbol &Sym,
 unsigned ARMELFObjectWriter::getRelocType(MCContext &Ctx, const MCValue &Target,
                                           const MCFixup &Fixup,
                                           bool IsPCRel) const {
-  return GetRelocTypeInner(Target, Fixup, IsPCRel);
+  return GetRelocTypeInner(Target, Fixup, IsPCRel, Ctx);
 }
 
 unsigned ARMELFObjectWriter::GetRelocTypeInner(const MCValue &Target,
                                                const MCFixup &Fixup,
-                                               bool IsPCRel) const  {
+                                               bool IsPCRel,
+                                               MCContext &Ctx) const {
   MCSymbolRefExpr::VariantKind Modifier = Target.getAccessVariant();
 
   unsigned Type = 0;
   if (IsPCRel) {
     switch ((unsigned)Fixup.getKind()) {
     default:
-      report_fatal_error("unsupported relocation on symbol");
+      Ctx.reportFatalError(Fixup.getLoc(), "unsupported relocation on symbol");
       return ELF::R_ARM_NONE;
     case FK_Data_4:
       switch (Modifier) {
@@ -160,7 +161,7 @@ unsigned ARMELFObjectWriter::GetRelocTypeInner(const MCValue &Target,
   } else {
     switch ((unsigned)Fixup.getKind()) {
     default:
-      report_fatal_error("unsupported relocation on symbol");
+      Ctx.reportFatalError(Fixup.getLoc(), "unsupported relocation on symbol");
       return ELF::R_ARM_NONE;
     case FK_Data_1:
       switch (Modifier) {
diff --git a/llvm/lib/Target/BPF/MCTargetDesc/BPFAsmBackend.cpp b/llvm/lib/Target/BPF/MCTargetDesc/BPFAsmBackend.cpp
index afc321ea2c3..1f355171ebd 100644
--- a/llvm/lib/Target/BPF/MCTargetDesc/BPFAsmBackend.cpp
+++ b/llvm/lib/Target/BPF/MCTargetDesc/BPFAsmBackend.cpp
@@ -28,7 +28,7 @@ public:
   ~BPFAsmBackend() override = default;
 
   void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
-                  uint64_t Value, bool IsPCRel) const override;
+                  uint64_t Value, bool IsPCRel, MCContext &Ctx) const override;
 
   MCObjectWriter *createObjectWriter(raw_pwrite_stream &OS) const override;
 
@@ -62,8 +62,8 @@ bool BPFAsmBackend::writeNopData(uint64_t Count, MCObjectWriter *OW) const {
 }
 
 void BPFAsmBackend::applyFixup(const MCFixup &Fixup, char *Data,
-                               unsigned DataSize, uint64_t Value,
-                               bool IsPCRel) const {
+                               unsigned DataSize, uint64_t Value, bool IsPCRel,
+                               MCContext &Ctx) const {
   if (Fixup.getKind() == FK_SecRel_4 || Fixup.getKind() == FK_SecRel_8) {
     assert(Value == 0);
   } else if (Fixup.getKind() == FK_Data_4 || Fixup.getKind() == FK_Data_8) {
diff --git a/llvm/lib/Target/Hexagon/MCTargetDesc/HexagonAsmBackend.cpp b/llvm/lib/Target/Hexagon/MCTargetDesc/HexagonAsmBackend.cpp
index cb7d450c3c5..337af294eb8 100644
--- a/llvm/lib/Target/Hexagon/MCTargetDesc/HexagonAsmBackend.cpp
+++ b/llvm/lib/Target/Hexagon/MCTargetDesc/HexagonAsmBackend.cpp
@@ -402,7 +402,8 @@ public:
   /// data fragment, at the offset specified by the fixup and following the
   /// fixup kind as appropriate.
   void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
-                  uint64_t FixupValue, bool IsPCRel) const override {
+                  uint64_t FixupValue, bool IsPCRel,
+                  MCContext &Ctx) const override {
 
     // When FixupValue is 0 the relocation is external and there
     // is nothing for us to do.
diff --git a/llvm/lib/Target/Lanai/MCTargetDesc/LanaiAsmBackend.cpp b/llvm/lib/Target/Lanai/MCTargetDesc/LanaiAsmBackend.cpp
index a04fe8112fb..0ef1401ef53 100644
--- a/llvm/lib/Target/Lanai/MCTargetDesc/LanaiAsmBackend.cpp
+++ b/llvm/lib/Target/Lanai/MCTargetDesc/LanaiAsmBackend.cpp
@@ -50,7 +50,7 @@ public:
       : MCAsmBackend(), OSType(OST) {}
 
   void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
-                  uint64_t Value, bool IsPCRel) const override;
+                  uint64_t Value, bool IsPCRel, MCContext &Ctx) const override;
 
   MCObjectWriter *createObjectWriter(raw_pwrite_stream &OS) const override;
 
@@ -90,7 +90,7 @@ bool LanaiAsmBackend::writeNopData(uint64_t Count, MCObjectWriter *OW) const {
 
 void LanaiAsmBackend::applyFixup(const MCFixup &Fixup, char *Data,
                                  unsigned /*DataSize*/, uint64_t Value,
-                                 bool /*IsPCRel*/) const {
+                                 bool /*IsPCRel*/, MCContext & /*Ctx*/) const {
   MCFixupKind Kind = Fixup.getKind();
   Value = adjustFixupValue(static_cast<unsigned>(Kind), Value);
 
diff --git a/llvm/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp b/llvm/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
index 38b11f78e36..3304449efb9 100644
--- a/llvm/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
+++ b/llvm/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
@@ -34,7 +34,7 @@ using namespace llvm;
 
 // Prepare value for the target space for it
 static unsigned adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
-                                 MCContext *Ctx = nullptr) {
+                                 MCContext &Ctx) {
 
   unsigned Kind = Fixup.getKind();
 
@@ -74,8 +74,8 @@ static unsigned adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
     // address range. Forcing a signed division because Value can be negative.
     Value = (int64_t)Value / 4;
     // We now check if Value can be encoded as a 16-bit signed immediate.
-    if (!isInt<16>(Value) && Ctx) {
-      Ctx->reportError(Fixup.getLoc(), "out of range PC16 fixup");
+    if (!isInt<16>(Value)) {
+      Ctx.reportError(Fixup.getLoc(), "out of range PC16 fixup");
       return 0;
     }
     break;
@@ -84,8 +84,8 @@ static unsigned adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
     // Forcing a signed division because Value can be negative.
     Value = (int64_t)Value / 4;
     // We now check if Value can be encoded as a 19-bit signed immediate.
-    if (!isInt<19>(Value) && Ctx) {
-      Ctx->reportError(Fixup.getLoc(), "out of range PC19 fixup");
+    if (!isInt<19>(Value)) {
+      Ctx.reportError(Fixup.getLoc(), "out of range PC19 fixup");
       return 0;
     }
     break;
@@ -121,8 +121,8 @@ static unsigned adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
     // Forcing a signed division because Value can be negative.
     Value = (int64_t) Value / 2;
     // We now check if Value can be encoded as a 7-bit signed immediate.
-    if (!isInt<7>(Value) && Ctx) {
-      Ctx->reportError(Fixup.getLoc(), "out of range PC7 fixup");
+    if (!isInt<7>(Value)) {
+      Ctx.reportError(Fixup.getLoc(), "out of range PC7 fixup");
       return 0;
     }
     break;
@@ -131,8 +131,8 @@ static unsigned adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
     // Forcing a signed division because Value can be negative.
     Value = (int64_t) Value / 2;
     // We now check if Value can be encoded as a 10-bit signed immediate.
-    if (!isInt<10>(Value) && Ctx) {
-      Ctx->reportError(Fixup.getLoc(), "out of range PC10 fixup");
+    if (!isInt<10>(Value)) {
+      Ctx.reportError(Fixup.getLoc(), "out of range PC10 fixup");
       return 0;
     }
     break;
@@ -141,8 +141,8 @@ static unsigned adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
     // Forcing a signed division because Value can be negative.
     Value = (int64_t)Value / 2;
     // We now check if Value can be encoded as a 16-bit signed immediate.
-    if (!isInt<16>(Value) && Ctx) {
-      Ctx->reportError(Fixup.getLoc(), "out of range PC16 fixup");
+    if (!isInt<16>(Value)) {
+      Ctx.reportError(Fixup.getLoc(), "out of range PC16 fixup");
       return 0;
     }
     break;
@@ -150,21 +150,21 @@ static unsigned adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
     // Forcing a signed division because Value can be negative.
     Value = (int64_t)Value / 8;
     // We now check if Value can be encoded as a 18-bit signed immediate.
-    if (!isInt<18>(Value) && Ctx) {
-      Ctx->reportError(Fixup.getLoc(), "out of range PC18 fixup");
+    if (!isInt<18>(Value)) {
+      Ctx.reportError(Fixup.getLoc(), "out of range PC18 fixup");
       return 0;
     }
     break;
   case Mips::fixup_MICROMIPS_PC18_S3:
     // Check alignment.
-    if ((Value & 7) && Ctx) {
-      Ctx->reportError(Fixup.getLoc(), "out of range PC18 fixup");
+    if ((Value & 7)) {
+      Ctx.reportError(Fixup.getLoc(), "out of range PC18 fixup");
     }
     // Forcing a signed division because Value can be negative.
     Value = (int64_t)Value / 8;
     // We now check if Value can be encoded as a 18-bit signed immediate.
-    if (!isInt<18>(Value) && Ctx) {
-      Ctx->reportError(Fixup.getLoc(), "out of range PC18 fixup");
+    if (!isInt<18>(Value)) {
+      Ctx.reportError(Fixup.getLoc(), "out of range PC18 fixup");
       return 0;
     }
     break;
@@ -172,8 +172,8 @@ static unsigned adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
     // Forcing a signed division because Value can be negative.
     Value = (int64_t) Value / 4;
     // We now check if Value can be encoded as a 21-bit signed immediate.
-    if (!isInt<21>(Value) && Ctx) {
-      Ctx->reportError(Fixup.getLoc(), "out of range PC21 fixup");
+    if (!isInt<21>(Value)) {
+      Ctx.reportError(Fixup.getLoc(), "out of range PC21 fixup");
       return 0;
     }
     break;
@@ -181,8 +181,8 @@ static unsigned adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
     // Forcing a signed division because Value can be negative.
     Value = (int64_t) Value / 4;
     // We now check if Value can be encoded as a 26-bit signed immediate.
-    if (!isInt<26>(Value) && Ctx) {
-      Ctx->reportError(Fixup.getLoc(), "out of range PC26 fixup");
+    if (!isInt<26>(Value)) {
+      Ctx.reportError(Fixup.getLoc(), "out of range PC26 fixup");
       return 0;
     }
     break;
@@ -190,8 +190,8 @@ static unsigned adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
     // Forcing a signed division because Value can be negative.
     Value = (int64_t)Value / 2;
     // We now check if Value can be encoded as a 26-bit signed immediate.
-    if (!isInt<26>(Value) && Ctx) {
-      Ctx->reportFatalError(Fixup.getLoc(), "out of range PC26 fixup");
+    if (!isInt<26>(Value)) {
+      Ctx.reportFatalError(Fixup.getLoc(), "out of range PC26 fixup");
       return 0;
     }
     break;
@@ -199,8 +199,8 @@ static unsigned adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
     // Forcing a signed division because Value can be negative.
     Value = (int64_t)Value / 2;
     // We now check if Value can be encoded as a 21-bit signed immediate.
-    if (!isInt<21>(Value) && Ctx) {
-      Ctx->reportError(Fixup.getLoc(), "out of range PC21 fixup");
+    if (!isInt<21>(Value)) {
+      Ctx.reportError(Fixup.getLoc(), "out of range PC21 fixup");
       return 0;
     }
     break;
@@ -236,10 +236,10 @@ static unsigned calculateMMLEIndex(unsigned i) {
 /// data fragment, at the offset specified by the fixup and following the
 /// fixup kind as appropriate.
 void MipsAsmBackend::applyFixup(const MCFixup &Fixup, char *Data,
-                                unsigned DataSize, uint64_t Value,
-                                bool IsPCRel) const {
+                                unsigned DataSize, uint64_t Value, bool IsPCRel,
+                                MCContext &Ctx) const {
   MCFixupKind Kind = Fixup.getKind();
-  Value = adjustFixupValue(Fixup, Value);
+  Value = adjustFixupValue(Fixup, Value, Ctx);
 
   if (!Value)
     return; // Doesn't change encoding.
@@ -471,24 +471,6 @@ bool MipsAsmBackend::writeNopData(uint64_t Count, MCObjectWriter *OW) const {
   return true;
 }
 
-/// processFixupValue - Target hook to process the literal value of a fixup
-/// if necessary.
-void MipsAsmBackend::processFixupValue(const MCAssembler &Asm,
-                                       const MCAsmLayout &Layout,
-                                       const MCFixup &Fixup,
-                                       const MCFragment *DF,
-                                       const MCValue &Target,
-                                       uint64_t &Value,
-                                       bool &IsResolved) {
-  // At this point we'll ignore the value returned by adjustFixupValue as
-  // we are only checking if the fixup can be applied correctly. We have
-  // access to MCContext from here which allows us to report a fatal error
-  // with *possibly* a source code location.
-  // The caller will also ignore any changes we make to Value
-  // (recordRelocation() overwrites it with it's own calculation).
-  (void)adjustFixupValue(Fixup, Value, &Asm.getContext());
-}
-
 // MCAsmBackend
 MCAsmBackend *llvm::createMipsAsmBackendEL32(const Target &T,
                                              const MCRegisterInfo &MRI,
diff --git a/llvm/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.h b/llvm/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.h
index f260cfa566c..4b3cc6e21f4 100644
--- a/llvm/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.h
+++ b/llvm/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.h
@@ -39,7 +39,7 @@ public:
   MCObjectWriter *createObjectWriter(raw_pwrite_stream &OS) const override;
 
   void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
-                  uint64_t Value, bool IsPCRel) const override;
+                  uint64_t Value, bool IsPCRel, MCContext &Ctx) const override;
 
   Optional<MCFixupKind> getFixupKind(StringRef Name) const override;
   const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override;
@@ -82,11 +82,6 @@ public:
 
   bool writeNopData(uint64_t Count, MCObjectWriter *OW) const override;
 
-  void processFixupValue(const MCAssembler &Asm, const MCAsmLayout &Layout,
-                         const MCFixup &Fixup, const MCFragment *DF,
-                         const MCValue &Target, uint64_t &Value,
-                         bool &IsResolved) override;
-
 }; // class MipsAsmBackend
 
 } // namespace
diff --git a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp
index 5847b3a52bf..4863ac54273 100644
--- a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp
+++ b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp
@@ -114,7 +114,7 @@ public:
   }
 
   void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
-                  uint64_t Value, bool IsPCRel) const override {
+                  uint64_t Value, bool IsPCRel, MCContext &Ctx) const override {
     Value = adjustFixupValue(Fixup.getKind(), Value);
     if (!Value) return;           // Doesn't change encoding.
 
diff --git a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVAsmBackend.cpp b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVAsmBackend.cpp
index f8ef142255c..d6f2672271e 100644
--- a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVAsmBackend.cpp
+++ b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVAsmBackend.cpp
@@ -33,7 +33,7 @@ public:
   ~RISCVAsmBackend() override {}
 
   void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
-                  uint64_t Value, bool IsPCRel) const override;
+                  uint64_t Value, bool IsPCRel, MCContext &Ctx) const override;
 
   MCObjectWriter *createObjectWriter(raw_pwrite_stream &OS) const override;
 
@@ -71,7 +71,7 @@ bool RISCVAsmBackend::writeNopData(uint64_t Count, MCObjectWriter *OW) const {
 
 void RISCVAsmBackend::applyFixup(const MCFixup &Fixup, char *Data,
                                  unsigned DataSize, uint64_t Value,
-                                 bool IsPCRel) const {
+                                 bool IsPCRel, MCContext &Ctx) const {
   return;
 }
 
diff --git a/llvm/lib/Target/Sparc/MCTargetDesc/SparcAsmBackend.cpp b/llvm/lib/Target/Sparc/MCTargetDesc/SparcAsmBackend.cpp
index 6106a6c32dc..cc07547ede2 100644
--- a/llvm/lib/Target/Sparc/MCTargetDesc/SparcAsmBackend.cpp
+++ b/llvm/lib/Target/Sparc/MCTargetDesc/SparcAsmBackend.cpp
@@ -274,7 +274,8 @@ namespace {
       SparcAsmBackend(T), OSType(OSType) { }
 
     void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
-                    uint64_t Value, bool IsPCRel) const override {
+                    uint64_t Value, bool IsPCRel,
+                    MCContext &Ctx) const override {
 
       Value = adjustFixupValue(Fixup.getKind(), Value);
       if (!Value) return;           // Doesn't change encoding.
diff --git a/llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCAsmBackend.cpp b/llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCAsmBackend.cpp
index 9192448afd0..23b7d5b5d50 100644
--- a/llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCAsmBackend.cpp
+++ b/llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCAsmBackend.cpp
@@ -51,7 +51,7 @@ public:
   }
   const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override;
   void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
-                  uint64_t Value, bool IsPCRel) const override;
+                  uint64_t Value, bool IsPCRel, MCContext &Ctx) const override;
   bool mayNeedRelaxation(const MCInst &Inst) const override {
     return false;
   }
@@ -91,7 +91,7 @@ SystemZMCAsmBackend::getFixupKindInfo(MCFixupKind Kind) const {
 
 void SystemZMCAsmBackend::applyFixup(const MCFixup &Fixup, char *Data,
                                      unsigned DataSize, uint64_t Value,
-                                     bool IsPCRel) const {
+                                     bool IsPCRel, MCContext &Ctx) const {
   MCFixupKind Kind = Fixup.getKind();
   unsigned Offset = Fixup.getOffset();
   unsigned BitSize = getFixupKindInfo(Kind).TargetSize;
diff --git a/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp b/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
index e83ec9f4045..a713af6aadb 100644
--- a/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
+++ b/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
@@ -109,7 +109,7 @@ public:
   }
 
   void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
-                  uint64_t Value, bool IsPCRel) const override {
+                  uint64_t Value, bool IsPCRel, MCContext &Ctx) const override {
     unsigned Size = 1 << getFixupKindLog2Size(Fixup.getKind());
 
     assert(Fixup.getOffset() + Size <= DataSize &&